in_gif.c

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    1 /*      $FreeBSD: releng/5.0/sys/netinet/in_gif.c 105340 2002-10-17 17:47:55Z ume $     */
    2 /*      $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 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_mrouting.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/socket.h>
   40 #include <sys/sockio.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/errno.h>
   43 #include <sys/kernel.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/protosw.h>
   46 
   47 #include <sys/malloc.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_systm.h>
   54 #include <netinet/ip.h>
   55 #include <netinet/ip_var.h>
   56 #include <netinet/in_gif.h>
   57 #include <netinet/in_var.h>
   58 #include <netinet/ip_encap.h>
   59 #include <netinet/ip_ecn.h>
   60 
   61 #ifdef INET6
   62 #include <netinet/ip6.h>
   63 #endif
   64 
   65 #ifdef MROUTING
   66 #include <netinet/ip_mroute.h>
   67 #endif /* MROUTING */
   68 
   69 #include <net/if_gif.h> 
   70 
   71 #include <net/net_osdep.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 { SOCK_RAW,     &inetdomain,    0/*IPPROTO_IPV[46]*/,   PR_ATOMIC|PR_ADDR,
   79   in_gif_input, (pr_output_t*)rip_output, 0,            rip_ctloutput,
   80   0,
   81   0,            0,              0,              0,
   82   &rip_usrreqs
   83 };
   84 
   85 static int ip_gif_ttl = GIF_TTL;
   86 SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
   87         &ip_gif_ttl,    0, "");
   88 
   89 int
   90 in_gif_output(ifp, family, m)
   91         struct ifnet    *ifp;
   92         int             family;
   93         struct mbuf     *m;
   94 {
   95         struct gif_softc *sc = (struct gif_softc*)ifp;
   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         int proto, error;
  101         u_int8_t tos;
  102 
  103         if (sin_src == NULL || sin_dst == NULL ||
  104             sin_src->sin_family != AF_INET ||
  105             sin_dst->sin_family != AF_INET) {
  106                 m_freem(m);
  107                 return EAFNOSUPPORT;
  108         }
  109 
  110         switch (family) {
  111 #ifdef INET
  112         case AF_INET:
  113             {
  114                 struct ip *ip;
  115 
  116                 proto = IPPROTO_IPV4;
  117                 if (m->m_len < sizeof(*ip)) {
  118                         m = m_pullup(m, sizeof(*ip));
  119                         if (!m)
  120                                 return ENOBUFS;
  121                 }
  122                 ip = mtod(m, struct ip *);
  123                 tos = ip->ip_tos;
  124                 break;
  125             }
  126 #endif /* INET */
  127 #ifdef INET6
  128         case AF_INET6:
  129             {
  130                 struct ip6_hdr *ip6;
  131                 proto = IPPROTO_IPV6;
  132                 if (m->m_len < sizeof(*ip6)) {
  133                         m = m_pullup(m, sizeof(*ip6));
  134                         if (!m)
  135                                 return ENOBUFS;
  136                 }
  137                 ip6 = mtod(m, struct ip6_hdr *);
  138                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  139                 break;
  140             }
  141 #endif /* INET6 */
  142         default:
  143 #ifdef DEBUG
  144                 printf("in_gif_output: warning: unknown family %d passed\n",
  145                         family);
  146 #endif
  147                 m_freem(m);
  148                 return EAFNOSUPPORT;
  149         }
  150 
  151         bzero(&iphdr, sizeof(iphdr));
  152         iphdr.ip_src = sin_src->sin_addr;
  153         /* bidirectional configured tunnel mode */
  154         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  155                 iphdr.ip_dst = sin_dst->sin_addr;
  156         else {
  157                 m_freem(m);
  158                 return ENETUNREACH;
  159         }
  160         iphdr.ip_p = proto;
  161         /* version will be set in ip_output() */
  162         iphdr.ip_ttl = ip_gif_ttl;
  163         iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
  164         if (ifp->if_flags & IFF_LINK1)
  165                 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
  166         else
  167                 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
  168 
  169         /* prepend new IP header */
  170         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  171         if (m && m->m_len < sizeof(struct ip))
  172                 m = m_pullup(m, sizeof(struct ip));
  173         if (m == NULL) {
  174                 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
  175                 return ENOBUFS;
  176         }
  177         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  178 
  179         if (dst->sin_family != sin_dst->sin_family ||
  180             dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
  181                 /* cache route doesn't match */
  182                 dst->sin_family = sin_dst->sin_family;
  183                 dst->sin_len = sizeof(struct sockaddr_in);
  184                 dst->sin_addr = sin_dst->sin_addr;
  185                 if (sc->gif_ro.ro_rt) {
  186                         RTFREE(sc->gif_ro.ro_rt);
  187                         sc->gif_ro.ro_rt = NULL;
  188                 }
  189 #if 0
  190                 sc->gif_if.if_mtu = GIF_MTU;
  191 #endif
  192         }
  193 
  194         if (sc->gif_ro.ro_rt == NULL) {
  195                 rtalloc(&sc->gif_ro);
  196                 if (sc->gif_ro.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_ro.ro_rt->rt_ifp->if_mtu
  208                         - sizeof(struct ip);
  209 #endif
  210         }
  211 
  212         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  213         return(error);
  214 }
  215 
  216 void
  217 in_gif_input(m, off)
  218         struct mbuf *m;
  219         int off;
  220 {
  221         struct ifnet *gifp = NULL;
  222         struct ip *ip;
  223         int af;
  224         u_int8_t otos;
  225         int proto;
  226 
  227         ip = mtod(m, struct ip *);
  228         proto = ip->ip_p;
  229 
  230         gifp = (struct ifnet *)encap_getarg(m);
  231 
  232         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  233                 m_freem(m);
  234                 ipstat.ips_nogif++;
  235                 return;
  236         }
  237 
  238         otos = ip->ip_tos;
  239         m_adj(m, off);
  240 
  241         switch (proto) {
  242 #ifdef INET
  243         case IPPROTO_IPV4:
  244             {
  245                 struct ip *ip;
  246                 af = AF_INET;
  247                 if (m->m_len < sizeof(*ip)) {
  248                         m = m_pullup(m, sizeof(*ip));
  249                         if (!m)
  250                                 return;
  251                 }
  252                 ip = mtod(m, struct ip *);
  253                 if (gifp->if_flags & IFF_LINK1)
  254                         ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
  255                 else
  256                         ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
  257                 break;
  258             }
  259 #endif
  260 #ifdef INET6
  261         case IPPROTO_IPV6:
  262             {
  263                 struct ip6_hdr *ip6;
  264                 u_int8_t itos;
  265                 af = AF_INET6;
  266                 if (m->m_len < sizeof(*ip6)) {
  267                         m = m_pullup(m, sizeof(*ip6));
  268                         if (!m)
  269                                 return;
  270                 }
  271                 ip6 = mtod(m, struct ip6_hdr *);
  272                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  273                 if (gifp->if_flags & IFF_LINK1)
  274                         ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
  275                 else
  276                         ip_ecn_egress(ECN_NOCARE, &otos, &itos);
  277                 ip6->ip6_flow &= ~htonl(0xff << 20);
  278                 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  279                 break;
  280             }
  281 #endif /* INET6 */
  282         default:
  283                 ipstat.ips_nogif++;
  284                 m_freem(m);
  285                 return;
  286         }
  287         gif_input(m, af, gifp);
  288         return;
  289 }
  290 
  291 /*
  292  * validate outer address.
  293  */
  294 static int
  295 gif_validate4(ip, sc, ifp)
  296         const struct ip *ip;
  297         struct gif_softc *sc;
  298         struct ifnet *ifp;
  299 {
  300         struct sockaddr_in *src, *dst;
  301         struct in_ifaddr *ia4;
  302 
  303         src = (struct sockaddr_in *)sc->gif_psrc;
  304         dst = (struct sockaddr_in *)sc->gif_pdst;
  305 
  306         /* check for address match */
  307         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  308             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  309                 return 0;
  310 
  311         /* martian filters on outer source - NOT done in ip_input! */
  312         if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
  313                 return 0;
  314         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  315         case 0: case 127: case 255:
  316                 return 0;
  317         }
  318         /* reject packets with broadcast on source */
  319         TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link)
  320         {
  321                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  322                         continue;
  323                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  324                         return 0;
  325         }
  326 
  327         /* ingress filters on outer source */
  328         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  329                 struct sockaddr_in sin;
  330                 struct rtentry *rt;
  331 
  332                 bzero(&sin, sizeof(sin));
  333                 sin.sin_family = AF_INET;
  334                 sin.sin_len = sizeof(struct sockaddr_in);
  335                 sin.sin_addr = ip->ip_src;
  336                 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
  337                 if (!rt || rt->rt_ifp != ifp) {
  338 #if 0
  339                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  340                             "due to ingress filter\n", if_name(&sc->gif_if),
  341                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  342 #endif
  343                         if (rt)
  344                                 rtfree(rt);
  345                         return 0;
  346                 }
  347                 rtfree(rt);
  348         }
  349 
  350         return 32 * 2;
  351 }
  352 
  353 /*
  354  * we know that we are in IFF_UP, outer address available, and outer family
  355  * matched the physical addr family.  see gif_encapcheck().
  356  */
  357 int
  358 gif_encapcheck4(m, off, proto, arg)
  359         const struct mbuf *m;
  360         int off;
  361         int proto;
  362         void *arg;
  363 {
  364         struct ip ip;
  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(ip), (caddr_t)&ip);
  373         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  374 
  375         return gif_validate4(&ip, sc, ifp);
  376 }
  377 
  378 int
  379 in_gif_attach(sc)
  380         struct gif_softc *sc;
  381 {
  382         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  383             &in_gif_protosw, sc);
  384         if (sc->encap_cookie4 == NULL)
  385                 return EEXIST;
  386         return 0;
  387 }
  388 
  389 int
  390 in_gif_detach(sc)
  391         struct gif_softc *sc;
  392 {
  393         int error;
  394 
  395         error = encap_detach(sc->encap_cookie4);
  396         if (error == 0)
  397                 sc->encap_cookie4 = NULL;
  398         return error;
  399 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in_gif.c

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