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 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/socket.h>
   41 #include <sys/sockio.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/errno.h>
   44 #include <sys/queue.h>
   45 #include <sys/syslog.h>
   46 #include <sys/protosw.h>
   47 
   48 #include <sys/malloc.h>
   49 
   50 #include <net/if.h>
   51 #include <net/route.h>
   52 
   53 #include <netinet/in.h>
   54 #include <netinet/in_systm.h>
   55 #ifdef INET
   56 #include <netinet/ip.h>
   57 #endif
   58 #include <netinet/ip_encap.h>
   59 #ifdef INET6
   60 #include <netinet/ip6.h>
   61 #include <netinet6/ip6_var.h>
   62 #include <netinet6/in6_gif.h>
   63 #include <netinet6/in6_var.h>
   64 #endif
   65 #include <netinet6/ip6protosw.h>
   66 #include <netinet/ip_ecn.h>
   67 #ifdef INET6
   68 #include <netinet6/ip6_ecn.h>
   69 #endif
   70 
   71 #include <net/if_gif.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(struct ifnet *ifp,
   87     int family,                 /* family of the packet to be encapsulate */
   88     struct mbuf *m)
   89 {
   90         struct gif_softc *sc = ifp->if_softc;
   91         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
   92         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
   93         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
   94         struct ip6_hdr *ip6;
   95         struct etherip_header eiphdr;
   96         int proto, error;
   97         u_int8_t itos, otos;
   98 
   99         GIF_LOCK_ASSERT(sc);
  100 
  101         if (sin6_src == NULL || sin6_dst == NULL ||
  102             sin6_src->sin6_family != AF_INET6 ||
  103             sin6_dst->sin6_family != AF_INET6) {
  104                 m_freem(m);
  105                 return EAFNOSUPPORT;
  106         }
  107 
  108         switch (family) {
  109 #ifdef INET
  110         case AF_INET:
  111             {
  112                 struct ip *ip;
  113 
  114                 proto = IPPROTO_IPV4;
  115                 if (m->m_len < sizeof(*ip)) {
  116                         m = m_pullup(m, sizeof(*ip));
  117                         if (!m)
  118                                 return ENOBUFS;
  119                 }
  120                 ip = mtod(m, struct ip *);
  121                 itos = ip->ip_tos;
  122                 break;
  123             }
  124 #endif
  125 #ifdef INET6
  126         case AF_INET6:
  127             {
  128                 struct ip6_hdr *ip6;
  129                 proto = IPPROTO_IPV6;
  130                 if (m->m_len < sizeof(*ip6)) {
  131                         m = m_pullup(m, sizeof(*ip6));
  132                         if (!m)
  133                                 return ENOBUFS;
  134                 }
  135                 ip6 = mtod(m, struct ip6_hdr *);
  136                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  137                 break;
  138             }
  139 #endif
  140         case AF_LINK:
  141                 proto = IPPROTO_ETHERIP;
  142                 eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  143                 eiphdr.eip_pad = 0;
  144                 /* prepend Ethernet-in-IP header */
  145                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  146                 if (m && m->m_len < sizeof(struct etherip_header))
  147                         m = m_pullup(m, sizeof(struct etherip_header));
  148                 if (m == NULL)
  149                         return ENOBUFS;
  150                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  151                     sizeof(struct etherip_header));
  152                 break;
  153 
  154         default:
  155 #ifdef DEBUG
  156                 printf("in6_gif_output: warning: unknown family %d passed\n",
  157                         family);
  158 #endif
  159                 m_freem(m);
  160                 return EAFNOSUPPORT;
  161         }
  162 
  163         /* prepend new IP header */
  164         M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  165         if (m && m->m_len < sizeof(struct ip6_hdr))
  166                 m = m_pullup(m, sizeof(struct ip6_hdr));
  167         if (m == NULL) {
  168                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  169                 return ENOBUFS;
  170         }
  171 
  172         ip6 = mtod(m, struct ip6_hdr *);
  173         ip6->ip6_flow   = 0;
  174         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  175         ip6->ip6_vfc    |= IPV6_VERSION;
  176         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  177         ip6->ip6_nxt    = proto;
  178         ip6->ip6_hlim   = ip6_gif_hlim;
  179         ip6->ip6_src    = sin6_src->sin6_addr;
  180         /* bidirectional configured tunnel mode */
  181         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  182                 ip6->ip6_dst = sin6_dst->sin6_addr;
  183         else  {
  184                 m_freem(m);
  185                 return ENETUNREACH;
  186         }
  187         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  188                        &otos, &itos);
  189         ip6->ip6_flow &= ~htonl(0xff << 20);
  190         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  191 
  192         if (dst->sin6_family != sin6_dst->sin6_family ||
  193              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  194                 /* cache route doesn't match */
  195                 bzero(dst, sizeof(*dst));
  196                 dst->sin6_family = sin6_dst->sin6_family;
  197                 dst->sin6_len = sizeof(struct sockaddr_in6);
  198                 dst->sin6_addr = sin6_dst->sin6_addr;
  199                 if (sc->gif_ro6.ro_rt) {
  200                         RTFREE(sc->gif_ro6.ro_rt);
  201                         sc->gif_ro6.ro_rt = NULL;
  202                 }
  203 #if 0
  204                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  205 #endif
  206         }
  207 
  208         if (sc->gif_ro6.ro_rt == NULL) {
  209                 rtalloc((struct route *)&sc->gif_ro6);
  210                 if (sc->gif_ro6.ro_rt == NULL) {
  211                         m_freem(m);
  212                         return ENETUNREACH;
  213                 }
  214 
  215                 /* if it constitutes infinite encapsulation, punt. */
  216                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  217                         m_freem(m);
  218                         return ENETUNREACH;     /*XXX*/
  219                 }
  220 #if 0
  221                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  222                         - sizeof(struct ip6_hdr);
  223 #endif
  224         }
  225 
  226 #ifdef IPV6_MINMTU
  227         /*
  228          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  229          * it is too painful to ask for resend of inner packet, to achieve
  230          * path MTU discovery for encapsulated packets.
  231          */
  232         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  233 #else
  234         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  235 #endif
  236 
  237         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  238             sc->gif_ro6.ro_rt != NULL) {
  239                 RTFREE(sc->gif_ro6.ro_rt);
  240                 sc->gif_ro6.ro_rt = NULL;
  241         }
  242 
  243         return (error);
  244 }
  245 
  246 int
  247 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  248 {
  249         struct mbuf *m = *mp;
  250         struct ifnet *gifp = NULL;
  251         struct gif_softc *sc;
  252         struct ip6_hdr *ip6;
  253         int af = 0;
  254         u_int32_t otos;
  255 
  256         ip6 = mtod(m, struct ip6_hdr *);
  257 
  258         sc = (struct gif_softc *)encap_getarg(m);
  259         if (sc == NULL) {
  260                 m_freem(m);
  261                 ip6stat.ip6s_nogif++;
  262                 return IPPROTO_DONE;
  263         }
  264 
  265         gifp = GIF2IFP(sc);
  266         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  267                 m_freem(m);
  268                 ip6stat.ip6s_nogif++;
  269                 return IPPROTO_DONE;
  270         }
  271 
  272         otos = ip6->ip6_flow;
  273         m_adj(m, *offp);
  274 
  275         switch (proto) {
  276 #ifdef INET
  277         case IPPROTO_IPV4:
  278             {
  279                 struct ip *ip;
  280                 u_int8_t otos8;
  281                 af = AF_INET;
  282                 otos8 = (ntohl(otos) >> 20) & 0xff;
  283                 if (m->m_len < sizeof(*ip)) {
  284                         m = m_pullup(m, sizeof(*ip));
  285                         if (!m)
  286                                 return IPPROTO_DONE;
  287                 }
  288                 ip = mtod(m, struct ip *);
  289                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  290                                   ECN_ALLOWED : ECN_NOCARE,
  291                                   &otos8, &ip->ip_tos) == 0) {
  292                         m_freem(m);
  293                         return IPPROTO_DONE;
  294                 }
  295                 break;
  296             }
  297 #endif /* INET */
  298 #ifdef INET6
  299         case IPPROTO_IPV6:
  300             {
  301                 struct ip6_hdr *ip6;
  302                 af = AF_INET6;
  303                 if (m->m_len < sizeof(*ip6)) {
  304                         m = m_pullup(m, sizeof(*ip6));
  305                         if (!m)
  306                                 return IPPROTO_DONE;
  307                 }
  308                 ip6 = mtod(m, struct ip6_hdr *);
  309                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  310                                    ECN_ALLOWED : ECN_NOCARE,
  311                                    &otos, &ip6->ip6_flow) == 0) {
  312                         m_freem(m);
  313                         return IPPROTO_DONE;
  314                 }
  315                 break;
  316             }
  317 #endif
  318         case IPPROTO_ETHERIP:
  319                 af = AF_LINK;
  320                 break;
  321 
  322         default:
  323                 ip6stat.ip6s_nogif++;
  324                 m_freem(m);
  325                 return IPPROTO_DONE;
  326         }
  327 
  328         gif_input(m, af, gifp);
  329         return IPPROTO_DONE;
  330 }
  331 
  332 /*
  333  * validate outer address.
  334  */
  335 static int
  336 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  337     struct ifnet *ifp)
  338 {
  339         struct sockaddr_in6 *src, *dst;
  340 
  341         src = (struct sockaddr_in6 *)sc->gif_psrc;
  342         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  343 
  344         /*
  345          * Check for address match.  Note that the check is for an incoming
  346          * packet.  We should compare the *source* address in our configuration
  347          * and the *destination* address of the packet, and vice versa.
  348          */
  349         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  350             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  351                 return 0;
  352 
  353         /* martian filters on outer source - done in ip6_input */
  354 
  355         /* ingress filters on outer source */
  356         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  357                 struct sockaddr_in6 sin6;
  358                 struct rtentry *rt;
  359 
  360                 bzero(&sin6, sizeof(sin6));
  361                 sin6.sin6_family = AF_INET6;
  362                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  363                 sin6.sin6_addr = ip6->ip6_src;
  364                 sin6.sin6_scope_id = 0; /* XXX */
  365 
  366                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  367                 if (!rt || rt->rt_ifp != ifp) {
  368 #if 0
  369                         char ip6buf[INET6_ADDRSTRLEN];
  370                         log(LOG_WARNING, "%s: packet from %s dropped "
  371                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  372                             ip6_sprintf(ip6buf, &sin6.sin6_addr));
  373 #endif
  374                         if (rt)
  375                                 rtfree(rt);
  376                         return 0;
  377                 }
  378                 rtfree(rt);
  379         }
  380 
  381         return 128 * 2;
  382 }
  383 
  384 /*
  385  * we know that we are in IFF_UP, outer address available, and outer family
  386  * matched the physical addr family.  see gif_encapcheck().
  387  * sanity check for arg should have been done in the caller.
  388  */
  389 int
  390 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
  391 {
  392         struct ip6_hdr ip6;
  393         struct gif_softc *sc;
  394         struct ifnet *ifp;
  395 
  396         /* sanity check done in caller */
  397         sc = (struct gif_softc *)arg;
  398 
  399         /* LINTED const cast */
  400         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  401         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  402 
  403         return gif_validate6(&ip6, sc, ifp);
  404 }
  405 
  406 int
  407 in6_gif_attach(struct gif_softc *sc)
  408 {
  409         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  410             (void *)&in6_gif_protosw, sc);
  411         if (sc->encap_cookie6 == NULL)
  412                 return EEXIST;
  413         return 0;
  414 }
  415 
  416 int
  417 in6_gif_detach(struct gif_softc *sc)
  418 {
  419         int error;
  420 
  421         error = encap_detach(sc->encap_cookie6);
  422         if (error == 0)
  423                 sc->encap_cookie6 = NULL;
  424         return error;
  425 }

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