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/netinet/ip_etherip.c

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    1 /*      $NetBSD: ip_etherip.c,v 1.1.2.1 2006/12/09 11:51:47 bouyer Exp $        */
    2 
    3 /*
    4  *  Copyright (c) 2006, Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
    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 Hans Rosenfeld nor the names of his
   16  *     contributors may be used to endorse or promote products derived
   17  *     from this software without specific prior written permission.
   18  *
   19  *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   33  * All rights reserved.
   34  *
   35  * Redistribution and use in source and binary forms, with or without
   36  * modification, are permitted provided that the following conditions
   37  * are met:
   38  * 1. Redistributions of source code must retain the above copyright
   39  *    notice, this list of conditions and the following disclaimer.
   40  * 2. Redistributions in binary form must reproduce the above copyright
   41  *    notice, this list of conditions and the following disclaimer in the
   42  *    documentation and/or other materials provided with the distribution.
   43  * 3. Neither the name of the project nor the names of its contributors
   44  *    may be used to endorse or promote products derived from this software
   45  *    without specific prior written permission.
   46  *
   47  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   57  * SUCH DAMAGE.
   58  */
   59 
   60 #include <sys/cdefs.h>
   61 
   62 #include "opt_inet.h"
   63 
   64 #include <sys/param.h>
   65 #include <sys/systm.h>
   66 #include <sys/socket.h>
   67 #include <sys/sockio.h>
   68 #include <sys/mbuf.h>
   69 #include <sys/device.h>
   70 #include <sys/errno.h>
   71 #include <sys/ioctl.h>
   72 #include <sys/syslog.h>
   73 #include <sys/protosw.h>
   74 #include <sys/kernel.h>
   75 
   76 #include <net/if.h>
   77 #include <net/route.h>
   78 
   79 #include <netinet/in.h>
   80 #include <netinet/in_systm.h>
   81 #include <netinet/ip.h>
   82 #include <netinet/ip_var.h>
   83 #include <netinet/in_var.h>
   84 #include <netinet/ip_etherip.h>
   85 
   86 #include <net/if_ether.h>
   87 #include <net/if_media.h>
   88 #include <net/if_etherip.h>
   89 
   90 #include <machine/stdarg.h>
   91 
   92 int
   93 ip_etherip_output(struct ifnet *ifp, struct mbuf *m)
   94 {
   95         struct etherip_softc *sc = (struct etherip_softc*)ifp->if_softc;
   96         struct sockaddr_in *dst, *sin_src, *sin_dst;
   97         struct ip iphdr;        /* capsule IP header, host byte ordered */
   98         struct etherip_header eiphdr;
   99         int proto, error;
  100 
  101         dst = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
  102         sin_src = (struct sockaddr_in *)sc->sc_src;
  103         sin_dst = (struct sockaddr_in *)sc->sc_dst;
  104 
  105         if (sin_src == NULL || 
  106             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         /* reset broadcast/multicast flags */
  114         m->m_flags &= ~(M_BCAST|M_MCAST);
  115 
  116         m->m_flags |= M_PKTHDR;
  117         proto = IPPROTO_ETHERIP;
  118 
  119         /* fill and prepend Ethernet-in-IP header */
  120         eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  121         eiphdr.eip_pad = 0;
  122         M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  123         if (m == NULL)
  124                 return ENOBUFS;
  125         if (M_UNWRITABLE(m, sizeof(struct etherip_header))) {
  126                 m = m_pullup(m, sizeof(struct etherip_header));
  127                 if (m == NULL)
  128                         return ENOBUFS;
  129         }
  130         memcpy(mtod(m, struct etherip_header *), &eiphdr, 
  131                sizeof(struct etherip_header));
  132 
  133         /* fill new IP header */
  134         memset(&iphdr, 0, sizeof(struct ip));
  135         iphdr.ip_src = sin_src->sin_addr;
  136         /* bidirectional configured tunnel mode */
  137         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  138                 iphdr.ip_dst = sin_dst->sin_addr;
  139         else {
  140                 m_freem(m);
  141                 return ENETUNREACH;
  142         }
  143         iphdr.ip_p = proto;
  144         /* version will be set in ip_output() */
  145         iphdr.ip_ttl = ETHERIP_TTL;
  146         iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
  147 
  148         /* prepend new IP header */
  149         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  150         if (m == NULL)
  151                 return ENOBUFS;
  152         if (M_UNWRITABLE(m, sizeof(struct ip)))
  153                 m = m_pullup(m, sizeof(struct ip));
  154         memcpy(mtod(m, struct ip *), &iphdr, sizeof(struct ip));
  155 
  156         if (sc->sc_route_expire - time_second <= 0 ||
  157             dst->sin_family != sin_dst->sin_family ||
  158             !in_hosteq(dst->sin_addr, sin_dst->sin_addr)) {
  159                 /* cache route doesn't match */
  160                 memset(dst, 0, sizeof(struct sockaddr_in));
  161                 dst->sin_family = sin_dst->sin_family;
  162                 dst->sin_len    = sizeof(struct sockaddr_in);
  163                 dst->sin_addr   = sin_dst->sin_addr;
  164                 if (sc->sc_ro.ro_rt) {
  165                         RTFREE(sc->sc_ro.ro_rt);
  166                         sc->sc_ro.ro_rt = NULL;
  167                 }
  168         }
  169 
  170         if (sc->sc_ro.ro_rt == NULL) {
  171                 rtalloc(&sc->sc_ro);
  172                 if (sc->sc_ro.ro_rt == NULL) {
  173                         m_freem(m);
  174                         return ENETUNREACH ;
  175                 }
  176 
  177                 /* if it constitutes infinite encapsulation, punt. */
  178                 if (sc->sc_ro.ro_rt->rt_ifp == ifp) {
  179                         m_freem(m);
  180                         return ENETUNREACH;     /*XXX*/
  181                 }
  182 
  183                 sc->sc_route_expire = time_second + ETHERIP_ROUTE_TTL;
  184         }
  185 
  186         error = ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
  187 
  188         return error;
  189 }
  190 
  191 void
  192 ip_etherip_input(struct mbuf *m, ...)
  193 {
  194         struct etherip_softc *sc;
  195         const struct ip *ip;
  196         struct sockaddr_in *src, *dst;
  197         struct ifnet *ifp = NULL;
  198         int off, proto;
  199         va_list ap;
  200 
  201         va_start(ap, m);
  202         off = va_arg(ap, int);
  203         proto = va_arg(ap, int);
  204         va_end(ap);
  205 
  206         if (proto != IPPROTO_ETHERIP) {
  207                 m_freem(m);
  208                 ipstat.ips_noproto++;
  209                 return;
  210         }
  211 
  212         ip = mtod(m, const struct ip *);
  213 
  214         /* find device configured for this packets src and dst */
  215         LIST_FOREACH(sc, &etherip_softc_list, etherip_list) {
  216                 if (!sc->sc_src || !sc->sc_dst)
  217                         continue;
  218 
  219                 if (sc->sc_src->sa_family != AF_INET ||
  220                     sc->sc_dst->sa_family != AF_INET)
  221                         continue;
  222 
  223                 src = (struct sockaddr_in *)sc->sc_src;
  224                 dst = (struct sockaddr_in *)sc->sc_dst;
  225 
  226                 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  227                     dst->sin_addr.s_addr != ip->ip_src.s_addr)
  228                         continue;
  229                 
  230                 ifp = &sc->sc_ec.ec_if;
  231                 break;
  232         }
  233 
  234         /* no matching device found */
  235         if (!ifp) {
  236                 m_freem(m);
  237                 ipstat.ips_odropped++;
  238                 return;
  239         }
  240 
  241         m_adj(m, off);
  242 
  243         /*
  244          * Section 4 of RFC 3378 requires that the EtherIP header of incoming
  245          * packets is verified to contain the correct values in the version and
  246          * reserved fields, and packets with wrong values be dropped.
  247          *
  248          * There is some discussion about what exactly the header should look
  249          * like, the RFC is not very clear there. To be compatible with broken
  250          * implementations, we don't check the header on incoming packets,
  251          * relying on the ethernet code to filter out garbage.
  252          *
  253          * The header we use for sending is compatible with the original
  254          * implementation in OpenBSD, which was used in former NetBSD versions
  255          * and is used in FreeBSD. One Linux implementation is known to use the
  256          * same value.
  257          */
  258         m_adj(m, sizeof(struct etherip_header));
  259         m = m_pullup(m, sizeof(struct ether_header));
  260         if (m == NULL) {
  261                 ifp->if_ierrors++;
  262                 return;
  263         }
  264 
  265         m->m_pkthdr.rcvif = ifp;
  266         m->m_flags &= ~(M_BCAST|M_MCAST);
  267 
  268 #if NBPFILTER > 0
  269         if (ifp->if_bpf)
  270                 bpf_mtap(ifp->if_bpf, m);
  271 #endif
  272 
  273         ifp->if_ipackets++;
  274         (ifp->if_input)(ifp, m);
  275 
  276         return;
  277 }
  278 

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