The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*      $NetBSD: ip_etherip.c,v 1.11 2008/10/19 23:28:31 hans 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 __KERNEL_RCSID(0, "$NetBSD: ip_etherip.c,v 1.11 2008/10/19 23:28:31 hans Exp $");
   62 
   63 #include "opt_inet.h"
   64 #include "bpfilter.h"
   65 
   66 #include <sys/param.h>
   67 #include <sys/systm.h>
   68 #include <sys/socket.h>
   69 #include <sys/sockio.h>
   70 #include <sys/mbuf.h>
   71 #include <sys/device.h>
   72 #include <sys/errno.h>
   73 #include <sys/ioctl.h>
   74 #include <sys/syslog.h>
   75 #include <sys/protosw.h>
   76 #include <sys/kernel.h>
   77 
   78 #include <net/if.h>
   79 #include <net/route.h>
   80 
   81 #include <netinet/in.h>
   82 #include <netinet/in_systm.h>
   83 #include <netinet/ip.h>
   84 #include <netinet/ip_var.h>
   85 #include <netinet/in_var.h>
   86 #include <netinet/ip_etherip.h>
   87 
   88 #include <net/if_ether.h>
   89 #include <net/if_media.h>
   90 #include <net/if_etherip.h>
   91 #if NBPFILTER > 0
   92 #include <net/bpf.h>
   93 #endif
   94 
   95 #include <machine/stdarg.h>
   96 
   97 int
   98 ip_etherip_output(struct ifnet *ifp, struct mbuf *m)
   99 {
  100         struct rtentry *rt;
  101         struct etherip_softc *sc = (struct etherip_softc*)ifp->if_softc;
  102         struct sockaddr_in *sin_src, *sin_dst;
  103         struct ip iphdr;        /* capsule IP header, host byte ordered */
  104         struct etherip_header eiphdr;
  105         int proto, error;
  106         union {
  107                 struct sockaddr         dst;
  108                 struct sockaddr_in      dst4;
  109         } u;
  110 
  111         sin_src = (struct sockaddr_in *)sc->sc_src;
  112         sin_dst = (struct sockaddr_in *)sc->sc_dst;
  113 
  114         if (sin_src == NULL || 
  115             sin_dst == NULL ||
  116             sin_src->sin_family != AF_INET ||
  117             sin_dst->sin_family != AF_INET) {
  118                 m_freem(m);
  119                 return EAFNOSUPPORT;
  120         }
  121 
  122         /* reset broadcast/multicast flags */
  123         m->m_flags &= ~(M_BCAST|M_MCAST);
  124 
  125         m->m_flags |= M_PKTHDR;
  126         proto = IPPROTO_ETHERIP;
  127 
  128         /* fill and prepend Ethernet-in-IP header */
  129         eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
  130         eiphdr.eip_pad = 0;
  131         M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
  132         if (m == NULL)
  133                 return ENOBUFS;
  134         if (M_UNWRITABLE(m, sizeof(struct etherip_header))) {
  135                 m = m_pullup(m, sizeof(struct etherip_header));
  136                 if (m == NULL)
  137                         return ENOBUFS;
  138         }
  139         memcpy(mtod(m, struct etherip_header *), &eiphdr, 
  140                sizeof(struct etherip_header));
  141 
  142         /* fill new IP header */
  143         memset(&iphdr, 0, sizeof(struct ip));
  144         iphdr.ip_src = sin_src->sin_addr;
  145         /* bidirectional configured tunnel mode */
  146         if (sin_dst->sin_addr.s_addr != INADDR_ANY)
  147                 iphdr.ip_dst = sin_dst->sin_addr;
  148         else {
  149                 m_freem(m);
  150                 return ENETUNREACH;
  151         }
  152         iphdr.ip_p = proto;
  153         /* version will be set in ip_output() */
  154         iphdr.ip_ttl = ETHERIP_TTL;
  155         iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
  156 
  157         /* prepend new IP header */
  158         M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  159         if (m == NULL)
  160                 return ENOBUFS;
  161         if (M_UNWRITABLE(m, sizeof(struct ip)))
  162                 m = m_pullup(m, sizeof(struct ip));
  163         memcpy(mtod(m, struct ip *), &iphdr, sizeof(struct ip));
  164 
  165         sockaddr_in_init(&u.dst4, &sin_dst->sin_addr, 0);
  166         if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) {
  167                 m_freem(m);
  168                 return ENETUNREACH;
  169         }
  170 
  171         /* if it constitutes infinite encapsulation, punt. */
  172         if (rt->rt_ifp == ifp) {
  173                 rtcache_free(&sc->sc_ro);
  174                 m_freem(m);
  175                 return ENETUNREACH;     /*XXX*/
  176         }
  177 
  178         error = ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
  179 
  180         return error;
  181 }
  182 
  183 void
  184 ip_etherip_input(struct mbuf *m, ...)
  185 {
  186         struct etherip_softc *sc;
  187         const struct ip *ip;
  188         struct sockaddr_in *src, *dst;
  189         struct ifnet *ifp = NULL;
  190         int off, proto, s;
  191         va_list ap;
  192 
  193         va_start(ap, m);
  194         off = va_arg(ap, int);
  195         proto = va_arg(ap, int);
  196         va_end(ap);
  197 
  198         if (proto != IPPROTO_ETHERIP) {
  199                 m_freem(m);
  200                 ip_statinc(IP_STAT_NOPROTO);
  201                 return;
  202         }
  203 
  204         ip = mtod(m, const struct ip *);
  205 
  206         /* find device configured for this packets src and dst */
  207         LIST_FOREACH(sc, &etherip_softc_list, etherip_list) {
  208                 if (!sc->sc_src || !sc->sc_dst)
  209                         continue;
  210 
  211                 if (sc->sc_src->sa_family != AF_INET ||
  212                     sc->sc_dst->sa_family != AF_INET)
  213                         continue;
  214 
  215                 src = (struct sockaddr_in *)sc->sc_src;
  216                 dst = (struct sockaddr_in *)sc->sc_dst;
  217 
  218                 if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
  219                     dst->sin_addr.s_addr != ip->ip_src.s_addr)
  220                         continue;
  221                 
  222                 ifp = &sc->sc_ec.ec_if;
  223                 break;
  224         }
  225 
  226         /* no matching device found */
  227         if (!ifp) {
  228                 m_freem(m);
  229                 ip_statinc(IP_STAT_ODROPPED);
  230                 return;
  231         }
  232 
  233         m_adj(m, off);
  234 
  235         /*
  236          * Section 4 of RFC 3378 requires that the EtherIP header of incoming
  237          * packets is verified to contain the correct values in the version and
  238          * reserved fields, and packets with wrong values be dropped.
  239          *
  240          * There is some discussion about what exactly the header should look
  241          * like, the RFC is not very clear there. To be compatible with broken
  242          * implementations, we don't check the header on incoming packets,
  243          * relying on the ethernet code to filter out garbage.
  244          *
  245          * The header we use for sending is compatible with the original
  246          * implementation in OpenBSD, which was used in former NetBSD versions
  247          * and is used in FreeBSD. One Linux implementation is known to use the
  248          * same value.
  249          */
  250         m_adj(m, sizeof(struct etherip_header));
  251         m = m_pullup(m, sizeof(struct ether_header));
  252         if (m == NULL) {
  253                 ifp->if_ierrors++;
  254                 return;
  255         }
  256 
  257         m->m_pkthdr.rcvif = ifp;
  258         m->m_flags &= ~(M_BCAST|M_MCAST);
  259 
  260 #if NBPFILTER > 0
  261         if (ifp->if_bpf)
  262                 bpf_mtap(ifp->if_bpf, m);
  263 #endif
  264 
  265         ifp->if_ipackets++;
  266 
  267         s = splnet();
  268         (ifp->if_input)(ifp, m);
  269         splx(s);
  270 
  271         return;
  272 }
  273 

Cache object: 06c75e9b01aa950d4508710f154e78a4


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.