in_gif.c

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    1 /*      $NetBSD: in_gif.c,v 1.34 2003/11/11 20:25:26 jonathan Exp $     */
    2 /*      $KAME: in_gif.c,v 1.66 2001/07/29 04:46:09 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 <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: in_gif.c,v 1.34 2003/11/11 20:25:26 jonathan Exp $");
   35 
   36 #include "opt_inet.h"
   37 #include "opt_iso.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/ioctl.h>
   46 #include <sys/syslog.h>
   47 #include <sys/protosw.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 #include <net/if_gif.h>
   66 
   67 #include "gif.h"
   68 
   69 #include <machine/stdarg.h>
   70 
   71 #include <net/net_osdep.h>
   72 
   73 static int gif_validate4 __P((const struct ip *, struct gif_softc *,
   74         struct ifnet *));
   75 
   76 #if NGIF > 0
   77 int ip_gif_ttl = GIF_TTL;
   78 #else
   79 int ip_gif_ttl = 0;
   80 #endif
   81 
   82 extern struct domain inetdomain;
   83 struct protosw in_gif_protosw =
   84 { SOCK_RAW,     &inetdomain,    0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
   85   in_gif_input, rip_output,     0,              rip_ctloutput,
   86   rip_usrreq,
   87   0,            0,              0,              0,
   88 };
   89 
   90 int
   91 in_gif_output(ifp, family, m)
   92         struct ifnet    *ifp;
   93         int             family;
   94         struct mbuf     *m;
   95 {
   96         struct gif_softc *sc = (struct gif_softc*)ifp;
   97         struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
   98         struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
   99         struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
  100         struct ip iphdr;        /* capsule IP header, host byte ordered */
  101         int proto, error;
  102         u_int8_t tos;
  103 
  104         if (sin_src == NULL || sin_dst == NULL ||
  105             sin_src->sin_family != AF_INET ||
  106             sin_dst->sin_family != AF_INET) {
  107                 m_freem(m);
  108                 return EAFNOSUPPORT;
  109         }
  110 
  111         switch (family) {
  112 #ifdef INET
  113         case AF_INET:
  114             {
  115                 struct ip *ip;
  116 
  117                 proto = IPPROTO_IPV4;
  118                 if (m->m_len < sizeof(*ip)) {
  119                         m = m_pullup(m, sizeof(*ip));
  120                         if (!m)
  121                                 return ENOBUFS;
  122                 }
  123                 ip = mtod(m, struct ip *);
  124                 tos = ip->ip_tos;
  125                 break;
  126             }
  127 #endif /* INET */
  128 #ifdef INET6
  129         case AF_INET6:
  130             {
  131                 struct ip6_hdr *ip6;
  132                 proto = IPPROTO_IPV6;
  133                 if (m->m_len < sizeof(*ip6)) {
  134                         m = m_pullup(m, sizeof(*ip6));
  135                         if (!m)
  136                                 return ENOBUFS;
  137                 }
  138                 ip6 = mtod(m, struct ip6_hdr *);
  139                 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  140                 break;
  141             }
  142 #endif /* INET6 */
  143 #ifdef ISO
  144         case AF_ISO:
  145                 proto = IPPROTO_EON;
  146                 tos = 0;
  147                 break;
  148 #endif
  149         default:
  150 #ifdef DEBUG
  151                 printf("in_gif_output: warning: unknown family %d passed\n",
  152                         family);
  153 #endif
  154                 m_freem(m);
  155                 return EAFNOSUPPORT;
  156         }
  157 
  158         bzero(&iphdr, sizeof(iphdr));
  159         iphdr.ip_src = sin_src->sin_addr;
  160         /* bidirectional configured tunnel mode */
  161         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  162                 iphdr.ip_dst = sin_dst->sin_addr;
  163         else {
  164                 m_freem(m);
  165                 return ENETUNREACH;
  166         }
  167         iphdr.ip_p = proto;
  168         /* version will be set in ip_output() */
  169         iphdr.ip_ttl = ip_gif_ttl;
  170         iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
  171         if (ifp->if_flags & IFF_LINK1)
  172                 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
  173         else
  174                 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
  175 
  176         /* prepend new IP header */
  177         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  178         if (m && m->m_len < sizeof(struct ip))
  179                 m = m_pullup(m, sizeof(struct ip));
  180         if (m == NULL)
  181                 return ENOBUFS;
  182         bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
  183 
  184         if (dst->sin_family != sin_dst->sin_family ||
  185             dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
  186                 /* cache route doesn't match */
  187                 bzero(dst, sizeof(*dst));
  188                 dst->sin_family = sin_dst->sin_family;
  189                 dst->sin_len = sizeof(struct sockaddr_in);
  190                 dst->sin_addr = sin_dst->sin_addr;
  191                 if (sc->gif_ro.ro_rt) {
  192                         RTFREE(sc->gif_ro.ro_rt);
  193                         sc->gif_ro.ro_rt = NULL;
  194                 }
  195         }
  196 
  197         if (sc->gif_ro.ro_rt == NULL) {
  198                 rtalloc(&sc->gif_ro);
  199                 if (sc->gif_ro.ro_rt == NULL) {
  200                         m_freem(m);
  201                         return ENETUNREACH;
  202                 }
  203 
  204                 /* if it constitutes infinite encapsulation, punt. */
  205                 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
  206                         m_freem(m);
  207                         return ENETUNREACH;     /*XXX*/
  208                 }
  209         }
  210 
  211         error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
  212         return (error);
  213 }
  214 
  215 void
  216 #if __STDC__
  217 in_gif_input(struct mbuf *m, ...)
  218 #else
  219 in_gif_input(m, va_alist)
  220         struct mbuf *m;
  221         va_dcl
  222 #endif
  223 {
  224         int off, proto;
  225         struct ifnet *gifp = NULL;
  226         struct ip *ip;
  227         va_list ap;
  228         int af;
  229         u_int8_t otos;
  230 
  231         va_start(ap, m);
  232         off = va_arg(ap, int);
  233         proto = va_arg(ap, int);
  234         va_end(ap);
  235 
  236         ip = mtod(m, struct ip *);
  237 
  238         gifp = (struct ifnet *)encap_getarg(m);
  239 
  240         if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
  241                 m_freem(m);
  242                 ipstat.ips_nogif++;
  243                 return;
  244         }
  245 #ifndef GIF_ENCAPCHECK
  246         if (!gif_validate4(ip, (struct gif_softc *)gifp, m->m_pkthdr.rcvif)) {
  247                 m_freem(m);
  248                 ipstat.ips_nogif++;
  249                 return;
  250         }
  251 #endif
  252 
  253         otos = ip->ip_tos;
  254         m_adj(m, off);
  255 
  256         switch (proto) {
  257 #ifdef INET
  258         case IPPROTO_IPV4:
  259             {
  260                 struct ip *ip;
  261                 af = AF_INET;
  262                 if (m->m_len < sizeof(*ip)) {
  263                         m = m_pullup(m, sizeof(*ip));
  264                         if (!m)
  265                                 return;
  266                 }
  267                 ip = mtod(m, struct ip *);
  268                 if (gifp->if_flags & IFF_LINK1)
  269                         ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
  270                 else
  271                         ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
  272                 break;
  273             }
  274 #endif
  275 #ifdef INET6
  276         case IPPROTO_IPV6:
  277             {
  278                 struct ip6_hdr *ip6;
  279                 u_int8_t itos;
  280                 af = AF_INET6;
  281                 if (m->m_len < sizeof(*ip6)) {
  282                         m = m_pullup(m, sizeof(*ip6));
  283                         if (!m)
  284                                 return;
  285                 }
  286                 ip6 = mtod(m, struct ip6_hdr *);
  287                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  288                 if (gifp->if_flags & IFF_LINK1)
  289                         ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
  290                 else
  291                         ip_ecn_egress(ECN_NOCARE, &otos, &itos);
  292                 ip6->ip6_flow &= ~htonl(0xff << 20);
  293                 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
  294                 break;
  295             }
  296 #endif /* INET6 */
  297 #ifdef ISO
  298         case IPPROTO_EON:
  299                 af = AF_ISO;
  300                 break;
  301 #endif
  302         default:
  303                 ipstat.ips_nogif++;
  304                 m_freem(m);
  305                 return;
  306         }
  307         gif_input(m, af, gifp);
  308         return;
  309 }
  310 
  311 /*
  312  * validate outer address.
  313  */
  314 static int
  315 gif_validate4(ip, sc, ifp)
  316         const struct ip *ip;
  317         struct gif_softc *sc;
  318         struct ifnet *ifp;
  319 {
  320         struct sockaddr_in *src, *dst;
  321         struct in_ifaddr *ia4;
  322 
  323         src = (struct sockaddr_in *)sc->gif_psrc;
  324         dst = (struct sockaddr_in *)sc->gif_pdst;
  325 
  326         /* check for address match */
  327         if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  328             dst->sin_addr.s_addr != ip->ip_src.s_addr)
  329                 return 0;
  330 
  331         /* martian filters on outer source - NOT done in ip_input! */
  332         if (IN_MULTICAST(ip->ip_src.s_addr))
  333                 return 0;
  334         switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
  335         case 0: case 127: case 255:
  336                 return 0;
  337         }
  338         /* reject packets with broadcast on source */
  339         TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list) {
  340                 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
  341                         continue;
  342                 if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
  343                         return 0;
  344         }
  345 
  346         /* ingress filters on outer source */
  347         if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
  348                 struct sockaddr_in sin;
  349                 struct rtentry *rt;
  350 
  351                 bzero(&sin, sizeof(sin));
  352                 sin.sin_family = AF_INET;
  353                 sin.sin_len = sizeof(struct sockaddr_in);
  354                 sin.sin_addr = ip->ip_src;
  355                 rt = rtalloc1((struct sockaddr *)&sin, 0);
  356                 if (!rt || rt->rt_ifp != ifp) {
  357 #if 0
  358                         log(LOG_WARNING, "%s: packet from 0x%x dropped "
  359                             "due to ingress filter\n", if_name(&sc->gif_if),
  360                             (u_int32_t)ntohl(sin.sin_addr.s_addr));
  361 #endif
  362                         if (rt)
  363                                 rtfree(rt);
  364                         return 0;
  365                 }
  366                 rtfree(rt);
  367         }
  368 
  369         return 32 * 2;
  370 }
  371 
  372 #ifdef GIF_ENCAPCHECK
  373 /*
  374  * we know that we are in IFF_UP, outer address available, and outer family
  375  * matched the physical addr family.  see gif_encapcheck().
  376  */
  377 int
  378 gif_encapcheck4(m, off, proto, arg)
  379         const struct mbuf *m;
  380         int off;
  381         int proto;
  382         void *arg;
  383 {
  384         struct ip ip;
  385         struct gif_softc *sc;
  386         struct ifnet *ifp;
  387 
  388         /* sanity check done in caller */
  389         sc = (struct gif_softc *)arg;
  390 
  391         /* LINTED const cast */
  392         m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
  393         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  394 
  395         return gif_validate4(&ip, sc, ifp);
  396 }
  397 #endif
  398 
  399 int
  400 in_gif_attach(sc)
  401         struct gif_softc *sc;
  402 {
  403 #ifndef GIF_ENCAPCHECK
  404         struct sockaddr_in mask4;
  405 
  406         bzero(&mask4, sizeof(mask4));
  407         mask4.sin_len = sizeof(struct sockaddr_in);
  408         mask4.sin_addr.s_addr = ~0;
  409 
  410         if (!sc->gif_psrc || !sc->gif_pdst)
  411                 return EINVAL;
  412         sc->encap_cookie4 = encap_attach(AF_INET, -1, sc->gif_psrc,
  413             (struct sockaddr *)&mask4, sc->gif_pdst, (struct sockaddr *)&mask4,
  414             (struct protosw *)&in_gif_protosw, sc);
  415 #else
  416         sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
  417             &in_gif_protosw, sc);
  418 #endif
  419         if (sc->encap_cookie4 == NULL)
  420                 return EEXIST;
  421         return 0;
  422 }
  423 
  424 int
  425 in_gif_detach(sc)
  426         struct gif_softc *sc;
  427 {
  428         int error;
  429 
  430         error = encap_detach(sc->encap_cookie4);
  431         if (error == 0)
  432                 sc->encap_cookie4 = NULL;
  433         return error;
  434 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in_gif.c

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