in_gif.c

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    1 /*      $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
    2 
    3 /*-
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include "opt_mrouting.h"
   36 #include "opt_inet.h"
   37 #include "opt_inet6.h"
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/socket.h>
   42 #include <sys/sockio.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/errno.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/protosw.h>
   48 
   49 #include <sys/malloc.h>
   50 
   51 #include <net/if.h>
   52 #include <net/route.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet/in_systm.h>
   56 #include <netinet/ip.h>
   57 #include <netinet/ip_var.h>
   58 #include <netinet/in_gif.h>
   59 #include <netinet/in_var.h>
   60 #include <netinet/ip_encap.h>
   61 #include <netinet/ip_ecn.h>
   62 
   63 #ifdef INET6
   64 #include <netinet/ip6.h>
   65 #endif
   66 
   67 #ifdef MROUTING
   68 #include <netinet/ip_mroute.h>
   69 #endif /* MROUTING */
   70 
   71 #include <net/if_gif.h> 
   72 
   73 static int gif_validate4(const struct ip *, struct gif_softc *,
   74         struct ifnet *);
   75 
   76 extern  struct domain inetdomain;
   77 struct protosw in_gif_protosw = {
   78         .pr_type =              SOCK_RAW,
   79         .pr_domain =            &inetdomain,
   80         .pr_protocol =          0/* IPPROTO_IPV[46] */,
   81         .pr_flags =             PR_ATOMIC|PR_ADDR,
   82         .pr_input =             in_gif_input,
   83         .pr_output =            (pr_output_t*)rip_output,
   84         .pr_ctloutput =         rip_ctloutput,
   85         .pr_usrreqs =           &rip_usrreqs
   86 };
   87 
   88 static int ip_gif_ttl = GIF_TTL;
   89 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
   90         &ip_gif_ttl,    0, "");
   91 
   92 int
   93 in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
   94 {
   95         struct gif_softc *sc = ifp->if_softc;
   96         struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
   97         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   98         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
   99         struct ip iphdr;        /* capsule IP header, host byte ordered */
  100         struct etherip_header eiphdr;
  101         int proto, error;
  102         u_int8_t tos;
  103 
  104         GIF_LOCK_ASSERT(sc);
  105 
  106         if (sin_src == NULL || sin_dst == NULL ||
  107             sin_src->sin_family != AF_INET ||
  108             sin_dst->sin_family != AF_INET) {
  109                 m_freem(m);
  110                 return EAFNOSUPPORT;
  111         }
  112 
  113         switch (family) {
  114 #ifdef INET
  115         case AF_INET:
  116             {
  117                 struct ip *ip;
  118 
  119                 proto = IPPROTO_IPV4;
  120                 if (m->m_len < sizeof(*ip)) {
  121                         m = m_pullup(m, sizeof(*ip));
  122                         if (!m)
  123                                 return ENOBUFS;
  124                 }
  125                 ip = mtod(m, struct ip *);
  126                 tos = ip->ip_tos;
  127                 break;
  128             }
  129 #endif /* INET */
  130 #ifdef INET6
  131         case AF_INET6:
  132             {
  133                 struct ip6_hdr *ip6;
  134                 proto = IPPROTO_IPV6;
  135                 if (m->m_len < sizeof(*ip6)) {
  136                         m = m_pullup(m, sizeof(*ip6));
  137                         if (!m)
  138                                 return ENOBUFS;
  139                 }
  140                 ip6 = mtod(m, struct ip6_hdr *);
  141                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  142                 break;
  143             }
  144 #endif /* INET6 */
  145         case AF_LINK:
  146                 proto = IPPROTO_ETHERIP;
  147                 eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  148                 eiphdr.eip_pad = 0;
  149                 /* prepend Ethernet-in-IP header */
  150                 M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  151                 if (m && m->m_len < sizeof(struct etherip_header))
  152                         m = m_pullup(m, sizeof(struct etherip_header));
  153                 if (m == NULL)
  154                         return ENOBUFS;
  155                 bcopy(&eiphdr, mtod(m, struct etherip_header *),
  156                     sizeof(struct etherip_header));
  157                 break;
  158 
  159         default:
  160 #ifdef DEBUG
  161                 printf("in_gif_output: warning: unknown family %d passed\n",
  162                         family);
  163 #endif
  164                 m_freem(m);
  165                 return EAFNOSUPPORT;
  166         }
  167 
  168         bzero(&iphdr, sizeof(iphdr));
  169         iphdr.ip_src = sin_src->sin_addr;
  170         /* bidirectional configured tunnel mode */
  171         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  172                 iphdr.ip_dst = sin_dst->sin_addr;
  173         else {
  174                 m_freem(m);
  175                 return ENETUNREACH;
  176         }
  177         iphdr.ip_p = proto;
  178         /* version will be set in ip_output() */
  179         iphdr.ip_ttl = ip_gif_ttl;
  180         iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
  181         ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
  182                        &iphdr.ip_tos, &tos);
  183 
  184         /* prepend new IP header */
  185         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  186         if (m && m->m_len < sizeof(struct ip))
  187                 m = m_pullup(m, sizeof(struct ip));
  188         if (m == NULL) {
  189                 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
  190                 return ENOBUFS;
  191         }
  192         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  193 
  194         M_SETFIB(m, sc->gif_fibnum);
  195 
  196         if (dst->sin_family != sin_dst->sin_family ||
  197             dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
  198                 /* cache route doesn't match */
  199                 bzero(dst, sizeof(*dst));
  200                 dst->sin_family = sin_dst->sin_family;
  201                 dst->sin_len = sizeof(struct sockaddr_in);
  202                 dst->sin_addr = sin_dst->sin_addr;
  203                 if (sc->gif_ro.ro_rt) {
  204                         RTFREE(sc->gif_ro.ro_rt);
  205                         sc->gif_ro.ro_rt = NULL;
  206                 }
  207 #if 0
  208                 GIF2IFP(sc)->if_mtu = GIF_MTU;
  209 #endif
  210         }
  211 
  212         if (sc->gif_ro.ro_rt == NULL) {
  213                 in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum);
  214                 if (sc->gif_ro.ro_rt == NULL) {
  215                         m_freem(m);
  216                         return ENETUNREACH;
  217                 }
  218 
  219                 /* if it constitutes infinite encapsulation, punt. */
  220                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  221                         m_freem(m);
  222                         return ENETUNREACH;     /* XXX */
  223                 }
  224 #if 0
  225                 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
  226                         - sizeof(struct ip);
  227 #endif
  228         }
  229 
  230         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  231 
  232         if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
  233             sc->gif_ro.ro_rt != NULL) {
  234                 RTFREE(sc->gif_ro.ro_rt);
  235                 sc->gif_ro.ro_rt = NULL;
  236         }
  237 
  238         return (error);
  239 }
  240 
  241 void
  242 in_gif_input(struct mbuf *m, int off)
  243 {
  244         struct ifnet *gifp = NULL;
  245         struct gif_softc *sc;
  246         struct ip *ip;
  247         int af;
  248         u_int8_t otos;
  249         int proto;
  250 
  251         ip = mtod(m, struct ip *);
  252         proto = ip->ip_p;
  253 
  254         sc = (struct gif_softc *)encap_getarg(m);
  255         if (sc == NULL) {
  256                 m_freem(m);
  257                 ipstat.ips_nogif++;
  258                 return;
  259         }
  260 
  261         gifp = GIF2IFP(sc);
  262         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  263                 m_freem(m);
  264                 ipstat.ips_nogif++;
  265                 return;
  266         }
  267 
  268         otos = ip->ip_tos;
  269         m_adj(m, off);
  270 
  271         switch (proto) {
  272 #ifdef INET
  273         case IPPROTO_IPV4:
  274             {
  275                 struct ip *ip;
  276                 af = AF_INET;
  277                 if (m->m_len < sizeof(*ip)) {
  278                         m = m_pullup(m, sizeof(*ip));
  279                         if (!m)
  280                                 return;
  281                 }
  282                 ip = mtod(m, struct ip *);
  283                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  284                                   ECN_ALLOWED : ECN_NOCARE,
  285                                   &otos, &ip->ip_tos) == 0) {
  286                         m_freem(m);
  287                         return;
  288                 }
  289                 break;
  290             }
  291 #endif
  292 #ifdef INET6
  293         case IPPROTO_IPV6:
  294             {
  295                 struct ip6_hdr *ip6;
  296                 u_int8_t itos, oitos;
  297 
  298                 af = AF_INET6;
  299                 if (m->m_len < sizeof(*ip6)) {
  300                         m = m_pullup(m, sizeof(*ip6));
  301                         if (!m)
  302                                 return;
  303                 }
  304                 ip6 = mtod(m, struct ip6_hdr *);
  305                 itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  306                 if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
  307                                   ECN_ALLOWED : ECN_NOCARE,
  308                                   &otos, &itos) == 0) {
  309                         m_freem(m);
  310                         return;
  311                 }
  312                 if (itos != oitos) {
  313                         ip6->ip6_flow &= ~htonl(0xff << 20);
  314                         ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  315                 }
  316                 break;
  317             }
  318 #endif /* INET6 */
  319         case IPPROTO_ETHERIP:
  320                 af = AF_LINK;
  321                 break;  
  322 
  323         default:
  324                 ipstat.ips_nogif++;
  325                 m_freem(m);
  326                 return;
  327         }
  328         gif_input(m, af, gifp);
  329         return;
  330 }
  331 
  332 /*
  333  * validate outer address.
  334  */
  335 static int
  336 gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
  337 {
  338         struct sockaddr_in *src, *dst;
  339         struct in_ifaddr *ia4;
  340 
  341         src = (struct sockaddr_in *)sc->gif_psrc;
  342         dst = (struct sockaddr_in *)sc->gif_pdst;
  343 
  344         /* check for address match */
  345         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  346             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  347                 return 0;
  348 
  349         /* martian filters on outer source - NOT done in ip_input! */
  350         if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
  351                 return 0;
  352         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  353         case 0: case 127: case 255:
  354                 return 0;
  355         }
  356         /* reject packets with broadcast on source */
  357         TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link) {
  358                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  359                         continue;
  360                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  361                         return 0;
  362         }
  363 
  364         /* ingress filters on outer source */
  365         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  366                 struct sockaddr_in sin;
  367                 struct rtentry *rt;
  368 
  369                 bzero(&sin, sizeof(sin));
  370                 sin.sin_family = AF_INET;
  371                 sin.sin_len = sizeof(struct sockaddr_in);
  372                 sin.sin_addr = ip->ip_src;
  373                 /* XXX MRT  check for the interface we would use on output */
  374                 rt = in_rtalloc1((struct sockaddr *)&sin, 0,
  375                     0UL, sc->gif_fibnum);
  376                 if (!rt || rt->rt_ifp != ifp) {
  377 #if 0
  378                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  379                             "due to ingress filter\n", if_name(GIF2IFP(sc)),
  380                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  381 #endif
  382                         if (rt)
  383                                 RTFREE_LOCKED(rt);
  384                         return 0;
  385                 }
  386                 RTFREE_LOCKED(rt);
  387         }
  388 
  389         return 32 * 2;
  390 }
  391 
  392 /*
  393  * we know that we are in IFF_UP, outer address available, and outer family
  394  * matched the physical addr family.  see gif_encapcheck().
  395  */
  396 int
  397 gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
  398 {
  399         struct ip ip;
  400         struct gif_softc *sc;
  401         struct ifnet *ifp;
  402 
  403         /* sanity check done in caller */
  404         sc = (struct gif_softc *)arg;
  405 
  406         /* LINTED const cast */
  407         m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
  408         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  409 
  410         return gif_validate4(&ip, sc, ifp);
  411 }
  412 
  413 int
  414 in_gif_attach(struct gif_softc *sc)
  415 {
  416         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  417             &in_gif_protosw, sc);
  418         if (sc->encap_cookie4 == NULL)
  419                 return EEXIST;
  420         return 0;
  421 }
  422 
  423 int
  424 in_gif_detach(struct gif_softc *sc)
  425 {
  426         int error;
  427 
  428         error = encap_detach(sc->encap_cookie4);
  429         if (error == 0)
  430                 sc->encap_cookie4 = NULL;
  431         return error;
  432 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in_gif.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_gif.c
