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 /*      $FreeBSD$       */
    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 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   72                          struct ifnet *);
   73 
   74 extern  struct domain inet6domain;
   75 struct ip6protosw in6_gif_protosw =
   76 { SOCK_RAW,     &inet6domain,   0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
   77   in6_gif_input, rip6_output,   0,              rip6_ctloutput,
   78   0,
   79   0,            0,              0,              0,
   80   &rip6_usrreqs
   81 };
   82 
   83 int
   84 in6_gif_output(struct ifnet *ifp,
   85     int family,                 /* family of the packet to be encapsulate */
   86     struct mbuf *m)
   87 {
   88         struct gif_softc *sc = ifp->if_softc;
   89         struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
   90         struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
   91         struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
   92         struct ip6_hdr *ip6;
   93         struct etherip_header eiphdr;
   94         int proto, error;
   95         u_int8_t itos, otos;
   96 
   97         GIF_LOCK_ASSERT(sc);
   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         case AF_LINK:
  139                 proto = IPPROTO_ETHERIP;
  140                 eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  141                 eiphdr.eip_pad = 0;
  142                 /* prepend Ethernet-in-IP header */
  143                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  144                 if (m && m->m_len < sizeof(struct etherip_header))
  145                         m = m_pullup(m, sizeof(struct etherip_header));
  146                 if (m == NULL)
  147                         return ENOBUFS;
  148                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  149                     sizeof(struct etherip_header));
  150                 break;
  151 
  152         default:
  153 #ifdef DEBUG
  154                 printf("in6_gif_output: warning: unknown family %d passed\n",
  155                         family);
  156 #endif
  157                 m_freem(m);
  158                 return EAFNOSUPPORT;
  159         }
  160 
  161         /* prepend new IP header */
  162         M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  163         if (m && m->m_len < sizeof(struct ip6_hdr))
  164                 m = m_pullup(m, sizeof(struct ip6_hdr));
  165         if (m == NULL) {
  166                 printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
  167                 return ENOBUFS;
  168         }
  169 
  170         ip6 = mtod(m, struct ip6_hdr *);
  171         ip6->ip6_flow   = 0;
  172         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  173         ip6->ip6_vfc    |= IPV6_VERSION;
  174         ip6->ip6_plen   = htons((u_short)m->m_pkthdr.len);
  175         ip6->ip6_nxt    = proto;
  176         ip6->ip6_hlim   = ip6_gif_hlim;
  177         ip6->ip6_src    = sin6_src->sin6_addr;
  178         /* bidirectional configured tunnel mode */
  179         if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
  180                 ip6->ip6_dst = sin6_dst->sin6_addr;
  181         else  {
  182                 m_freem(m);
  183                 return ENETUNREACH;
  184         }
  185         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  186                        &otos, &itos);
  187         ip6->ip6_flow &= ~htonl(0xff << 20);
  188         ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
  189 
  190         if (dst->sin6_family != sin6_dst->sin6_family ||
  191              !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
  192                 /* cache route doesn't match */
  193                 bzero(dst, sizeof(*dst));
  194                 dst->sin6_family = sin6_dst->sin6_family;
  195                 dst->sin6_len = sizeof(struct sockaddr_in6);
  196                 dst->sin6_addr = sin6_dst->sin6_addr;
  197                 if (sc->gif_ro6.ro_rt) {
  198                         RTFREE(sc->gif_ro6.ro_rt);
  199                         sc->gif_ro6.ro_rt = NULL;
  200                 }
  201 #if 0
  202                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  203 #endif
  204         }
  205 
  206         if (sc->gif_ro6.ro_rt == NULL) {
  207                 rtalloc((struct route *)&sc->gif_ro6);
  208                 if (sc->gif_ro6.ro_rt == NULL) {
  209                         m_freem(m);
  210                         return ENETUNREACH;
  211                 }
  212 
  213                 /* if it constitutes infinite encapsulation, punt. */
  214                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  215                         m_freem(m);
  216                         return ENETUNREACH;     /*XXX*/
  217                 }
  218 #if 0
  219                 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
  220                         - sizeof(struct ip6_hdr);
  221 #endif
  222         }
  223 
  224 #ifdef IPV6_MINMTU
  225         /*
  226          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  227          * it is too painful to ask for resend of inner packet, to achieve
  228          * path MTU discovery for encapsulated packets.
  229          */
  230         error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
  231 #else
  232         error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
  233 #endif
  234 
  235         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  236             sc->gif_ro6.ro_rt != NULL) {
  237                 RTFREE(sc->gif_ro6.ro_rt);
  238                 sc->gif_ro6.ro_rt = NULL;
  239         }
  240 
  241         return (error);
  242 }
  243 
  244 int
  245 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  246 {
  247         struct mbuf *m = *mp;
  248         struct ifnet *gifp = NULL;
  249         struct gif_softc *sc;
  250         struct ip6_hdr *ip6;
  251         int af = 0;
  252         u_int32_t otos;
  253 
  254         ip6 = mtod(m, struct ip6_hdr *);
  255 
  256         sc = (struct gif_softc *)encap_getarg(m);
  257         if (sc == NULL) {
  258                 m_freem(m);
  259                 ip6stat.ip6s_nogif++;
  260                 return IPPROTO_DONE;
  261         }
  262 
  263         gifp = GIF2IFP(sc);
  264         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  265                 m_freem(m);
  266                 ip6stat.ip6s_nogif++;
  267                 return IPPROTO_DONE;
  268         }
  269 
  270         otos = ip6->ip6_flow;
  271         m_adj(m, *offp);
  272 
  273         switch (proto) {
  274 #ifdef INET
  275         case IPPROTO_IPV4:
  276             {
  277                 struct ip *ip;
  278                 u_int8_t otos8;
  279                 af = AF_INET;
  280                 otos8 = (ntohl(otos) >> 20) & 0xff;
  281                 if (m->m_len < sizeof(*ip)) {
  282                         m = m_pullup(m, sizeof(*ip));
  283                         if (!m)
  284                                 return IPPROTO_DONE;
  285                 }
  286                 ip = mtod(m, struct ip *);
  287                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  288                                   ECN_ALLOWED : ECN_NOCARE,
  289                                   &otos8, &ip->ip_tos) == 0) {
  290                         m_freem(m);
  291                         return IPPROTO_DONE;
  292                 }
  293                 break;
  294             }
  295 #endif /* INET */
  296 #ifdef INET6
  297         case IPPROTO_IPV6:
  298             {
  299                 struct ip6_hdr *ip6;
  300                 af = AF_INET6;
  301                 if (m->m_len < sizeof(*ip6)) {
  302                         m = m_pullup(m, sizeof(*ip6));
  303                         if (!m)
  304                                 return IPPROTO_DONE;
  305                 }
  306                 ip6 = mtod(m, struct ip6_hdr *);
  307                 if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  308                                    ECN_ALLOWED : ECN_NOCARE,
  309                                    &otos, &ip6->ip6_flow) == 0) {
  310                         m_freem(m);
  311                         return IPPROTO_DONE;
  312                 }
  313                 break;
  314             }
  315 #endif
  316         case IPPROTO_ETHERIP:
  317                 af = AF_LINK;
  318                 break;
  319 
  320         default:
  321                 ip6stat.ip6s_nogif++;
  322                 m_freem(m);
  323                 return IPPROTO_DONE;
  324         }
  325 
  326         gif_input(m, af, gifp);
  327         return IPPROTO_DONE;
  328 }
  329 
  330 /*
  331  * validate outer address.
  332  */
  333 static int
  334 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  335     struct ifnet *ifp)
  336 {
  337         struct sockaddr_in6 *src, *dst;
  338 
  339         src = (struct sockaddr_in6 *)sc->gif_psrc;
  340         dst = (struct sockaddr_in6 *)sc->gif_pdst;
  341 
  342         /*
  343          * Check for address match.  Note that the check is for an incoming
  344          * packet.  We should compare the *source* address in our configuration
  345          * and the *destination* address of the packet, and vice versa.
  346          */
  347         if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
  348             !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
  349                 return 0;
  350 
  351         /* martian filters on outer source - done in ip6_input */
  352 
  353         /* ingress filters on outer source */
  354         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  355                 struct sockaddr_in6 sin6;
  356                 struct rtentry *rt;
  357 
  358                 bzero(&sin6, sizeof(sin6));
  359                 sin6.sin6_family = AF_INET6;
  360                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  361                 sin6.sin6_addr = ip6->ip6_src;
  362                 sin6.sin6_scope_id = 0; /* XXX */
  363 
  364                 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  365                 if (!rt || rt->rt_ifp != ifp) {
  366 #if 0
  367                         char ip6buf[INET6_ADDRSTRLEN];
  368                         log(LOG_WARNING, "%s: packet from %s dropped "
  369                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  370                             ip6_sprintf(ip6buf, &sin6.sin6_addr));
  371 #endif
  372                         if (rt)
  373                                 rtfree(rt);
  374                         return 0;
  375                 }
  376                 rtfree(rt);
  377         }
  378 
  379         return 128 * 2;
  380 }
  381 
  382 /*
  383  * we know that we are in IFF_UP, outer address available, and outer family
  384  * matched the physical addr family.  see gif_encapcheck().
  385  * sanity check for arg should have been done in the caller.
  386  */
  387 int
  388 gif_encapcheck6(const struct mbuf *m, int off, int proto, void *arg)
  389 {
  390         struct ip6_hdr ip6;
  391         struct gif_softc *sc;
  392         struct ifnet *ifp;
  393 
  394         /* sanity check done in caller */
  395         sc = (struct gif_softc *)arg;
  396 
  397         /* LINTED const cast */
  398         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  399         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  400 
  401         return gif_validate6(&ip6, sc, ifp);
  402 }
  403 
  404 int
  405 in6_gif_attach(struct gif_softc *sc)
  406 {
  407         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  408             (void *)&in6_gif_protosw, sc);
  409         if (sc->encap_cookie6 == NULL)
  410                 return EEXIST;
  411         return 0;
  412 }
  413 
  414 int
  415 in6_gif_detach(struct gif_softc *sc)
  416 {
  417         int error;
  418 
  419         error = encap_detach(sc->encap_cookie6);
  420         if (error == 0)
  421                 sc->encap_cookie6 = NULL;
  422         return error;
  423 }

Cache object: d482bc9058a16290a951f8b902d3bee2


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