The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $FreeBSD: releng/5.3/sys/netinet6/in6_gif.c 136588 2004-10-16 08:43:07Z cvs2svn $       */
    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 = (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;
   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         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  172                        &otos, &itos);
  173         ip6->ip6_flow &= ~htonl(0xff << 20);
  174         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  175 
  176         if (dst->sin6_family != sin6_dst->sin6_family ||
  177              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  178                 /* cache route doesn't match */
  179                 bzero(dst, sizeof(*dst));
  180                 dst->sin6_family = sin6_dst->sin6_family;
  181                 dst->sin6_len = sizeof(struct sockaddr_in6);
  182                 dst->sin6_addr = sin6_dst->sin6_addr;
  183                 if (sc->gif_ro6.ro_rt) {
  184                         RTFREE(sc->gif_ro6.ro_rt);
  185                         sc->gif_ro6.ro_rt = NULL;
  186                 }
  187 #if 0
  188                 sc->gif_if.if_mtu = GIF_MTU;
  189 #endif
  190         }
  191 
  192         if (sc->gif_ro6.ro_rt == NULL) {
  193                 rtalloc((struct route *)&sc->gif_ro6);
  194                 if (sc->gif_ro6.ro_rt == NULL) {
  195                         m_freem(m);
  196                         return ENETUNREACH;
  197                 }
  198 
  199                 /* if it constitutes infinite encapsulation, punt. */
  200                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  201                         m_freem(m);
  202                         return ENETUNREACH;     /*XXX*/
  203                 }
  204 #if 0
  205                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  206                         - sizeof(struct ip6_hdr);
  207 #endif
  208         }
  209 
  210 #ifdef IPV6_MINMTU
  211         /*
  212          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  213          * it is too painful to ask for resend of inner packet, to achieve
  214          * path MTU discovery for encapsulated packets.
  215          */
  216         return (ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
  217 #else
  218         return (ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
  219 #endif
  220 }
  221 
  222 int
  223 in6_gif_input(mp, offp, proto)
  224         struct mbuf **mp;
  225         int *offp, proto;
  226 {
  227         struct mbuf *m = *mp;
  228         struct ifnet *gifp = NULL;
  229         struct ip6_hdr *ip6;
  230         int af = 0;
  231         u_int32_t otos;
  232 
  233         ip6 = mtod(m, struct ip6_hdr *);
  234 
  235         gifp = (struct ifnet *)encap_getarg(m);
  236 
  237         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  238                 m_freem(m);
  239                 ip6stat.ip6s_nogif++;
  240                 return IPPROTO_DONE;
  241         }
  242 
  243         otos = ip6->ip6_flow;
  244         m_adj(m, *offp);
  245 
  246         switch (proto) {
  247 #ifdef INET
  248         case IPPROTO_IPV4:
  249             {
  250                 struct ip *ip;
  251                 u_int8_t otos8;
  252                 af = AF_INET;
  253                 otos8 = (ntohl(otos) >> 20) & 0xff;
  254                 if (m->m_len < sizeof(*ip)) {
  255                         m = m_pullup(m, sizeof(*ip));
  256                         if (!m)
  257                                 return IPPROTO_DONE;
  258                 }
  259                 ip = mtod(m, struct ip *);
  260                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  261                                   ECN_ALLOWED : ECN_NOCARE,
  262                                   &otos8, &ip->ip_tos) == 0) {
  263                         m_freem(m);
  264                         return IPPROTO_DONE;
  265                 }
  266                 break;
  267             }
  268 #endif /* INET */
  269 #ifdef INET6
  270         case IPPROTO_IPV6:
  271             {
  272                 struct ip6_hdr *ip6;
  273                 af = AF_INET6;
  274                 if (m->m_len < sizeof(*ip6)) {
  275                         m = m_pullup(m, sizeof(*ip6));
  276                         if (!m)
  277                                 return IPPROTO_DONE;
  278                 }
  279                 ip6 = mtod(m, struct ip6_hdr *);
  280                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  281                                    ECN_ALLOWED : ECN_NOCARE,
  282                                    &otos, &ip6->ip6_flow) == 0) {
  283                         m_freem(m);
  284                         return IPPROTO_DONE;
  285                 }
  286                 break;
  287             }
  288 #endif
  289         default:
  290                 ip6stat.ip6s_nogif++;
  291                 m_freem(m);
  292                 return IPPROTO_DONE;
  293         }
  294 
  295         gif_input(m, af, gifp);
  296         return IPPROTO_DONE;
  297 }
  298 
  299 /*
  300  * validate outer address.
  301  */
  302 static int
  303 gif_validate6(ip6, sc, ifp)
  304         const struct ip6_hdr *ip6;
  305         struct gif_softc *sc;
  306         struct ifnet *ifp;
  307 {
  308         struct sockaddr_in6 *src, *dst;
  309 
  310         src = (struct sockaddr_in6 *)sc->gif_psrc;
  311         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  312 
  313         /*
  314          * Check for address match.  Note that the check is for an incoming
  315          * packet.  We should compare the *source* address in our configuration
  316          * and the *destination* address of the packet, and vice versa.
  317          */
  318         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  319             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  320                 return 0;
  321 
  322         /* martian filters on outer source - done in ip6_input */
  323 
  324         /* ingress filters on outer source */
  325         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  326                 struct sockaddr_in6 sin6;
  327                 struct rtentry *rt;
  328 
  329                 bzero(&sin6, sizeof(sin6));
  330                 sin6.sin6_family = AF_INET6;
  331                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  332                 sin6.sin6_addr = ip6->ip6_src;
  333                 sin6.sin6_scope_id = 0; /* XXX */
  334 
  335                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  336                 if (!rt || rt->rt_ifp != ifp) {
  337 #if 0
  338                         log(LOG_WARNING, "%s: packet from %s dropped "
  339                             "due to ingress filter\n", if_name(&sc->gif_if),
  340                             ip6_sprintf(&sin6.sin6_addr));
  341 #endif
  342                         if (rt)
  343                                 rtfree(rt);
  344                         return 0;
  345                 }
  346                 rtfree(rt);
  347         }
  348 
  349         return 128 * 2;
  350 }
  351 
  352 /*
  353  * we know that we are in IFF_UP, outer address available, and outer family
  354  * matched the physical addr family.  see gif_encapcheck().
  355  * sanity check for arg should have been done in the caller.
  356  */
  357 int
  358 gif_encapcheck6(m, off, proto, arg)
  359         const struct mbuf *m;
  360         int off;
  361         int proto;
  362         void *arg;
  363 {
  364         struct ip6_hdr ip6;
  365         struct gif_softc *sc;
  366         struct ifnet *ifp;
  367 
  368         /* sanity check done in caller */
  369         sc = (struct gif_softc *)arg;
  370 
  371         /* LINTED const cast */
  372         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  373         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  374 
  375         return gif_validate6(&ip6, sc, ifp);
  376 }
  377 
  378 int
  379 in6_gif_attach(sc)
  380         struct gif_softc *sc;
  381 {
  382         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  383             (struct protosw *)&in6_gif_protosw, sc);
  384         if (sc->encap_cookie6 == NULL)
  385                 return EEXIST;
  386         return 0;
  387 }
  388 
  389 int
  390 in6_gif_detach(sc)
  391         struct gif_softc *sc;
  392 {
  393         int error;
  394 
  395         error = encap_detach(sc->encap_cookie6);
  396         if (error == 0)
  397                 sc->encap_cookie6 = NULL;
  398         return error;
  399 }

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