284 lines
8.8 KiB
C
284 lines
8.8 KiB
C
/* $NetBSD: ip6_etherip.c,v 1.4 2007/02/17 22:34:13 dyoung Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2006, Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of Hans Rosenfeld nor the names of his
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#include "opt_inet.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/device.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/kernel.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#ifdef INET
|
|
#include <netinet/ip.h>
|
|
#endif
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet6/ip6_etherip.h>
|
|
#endif
|
|
|
|
#include <net/if_ether.h>
|
|
#include <net/if_media.h>
|
|
#include <net/if_etherip.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
int
|
|
ip6_etherip_output(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
|
|
struct sockaddr_in6 *dst, *sin6_src, *sin6_dst;
|
|
const struct sockaddr_in6 *cdst;
|
|
struct ip6_hdr *ip6; /* capsule IP header, host byte ordered */
|
|
struct etherip_header eiphdr;
|
|
int proto, error;
|
|
|
|
dst = (struct sockaddr_in6 *)&sc->sc_ro.ro_dst;
|
|
cdst = satocsin6(rtcache_getdst(&sc->sc_ro));
|
|
sin6_src = (struct sockaddr_in6 *)sc->sc_src;
|
|
sin6_dst = (struct sockaddr_in6 *)sc->sc_dst;
|
|
|
|
if (sin6_src == NULL ||
|
|
sin6_dst == NULL ||
|
|
sin6_src->sin6_family != AF_INET6 ||
|
|
sin6_dst->sin6_family != AF_INET6) {
|
|
m_freem(m);
|
|
return EAFNOSUPPORT;
|
|
}
|
|
|
|
/* reset broadcast/multicast flags */
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
|
|
m->m_flags |= M_PKTHDR;
|
|
proto = IPPROTO_ETHERIP;
|
|
|
|
/* fill and prepend Ethernet-in-IP header */
|
|
eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
|
|
eiphdr.eip_pad = 0;
|
|
M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
|
|
if (m == NULL)
|
|
return ENOBUFS;
|
|
if (M_UNWRITABLE(m, sizeof(struct etherip_header))) {
|
|
m = m_pullup(m, sizeof(struct etherip_header));
|
|
if (m == NULL)
|
|
return ENOBUFS;
|
|
}
|
|
memcpy(mtod(m, struct etherip_header *), &eiphdr,
|
|
sizeof(struct etherip_header));
|
|
|
|
/* prepend new IP header */
|
|
M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
|
|
if (m && m->m_len < sizeof(struct ip6_hdr))
|
|
m = m_pullup(m, sizeof(struct ip6_hdr));
|
|
if (m == NULL)
|
|
return ENOBUFS;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = proto;
|
|
ip6->ip6_hlim = ETHERIP_TTL;
|
|
ip6->ip6_src = sin6_src->sin6_addr;
|
|
|
|
/* bidirectional configured tunnel mode */
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
|
|
ip6->ip6_dst = sin6_dst->sin6_addr;
|
|
else {
|
|
m_freem(m);
|
|
return ENETUNREACH;
|
|
}
|
|
|
|
if (cdst->sin6_family != sin6_dst->sin6_family ||
|
|
!IN6_ARE_ADDR_EQUAL(&cdst->sin6_addr, &sin6_dst->sin6_addr))
|
|
rtcache_free((struct route *)&sc->sc_ro6);
|
|
else
|
|
rtcache_check((struct route *)&sc->sc_ro6);
|
|
|
|
if (sc->sc_ro6.ro_rt == NULL) {
|
|
memset(dst, 0, sizeof(*dst));
|
|
dst->sin6_family = sin6_dst->sin6_family;
|
|
dst->sin6_len = sizeof(struct sockaddr_in6);
|
|
dst->sin6_addr = sin6_dst->sin6_addr;
|
|
rtcache_init((struct route *)&sc->sc_ro6);
|
|
if (sc->sc_ro6.ro_rt == NULL) {
|
|
m_freem(m);
|
|
return ENETUNREACH;
|
|
}
|
|
}
|
|
/* if it constitutes infinite encapsulation, punt. */
|
|
if (sc->sc_ro.ro_rt->rt_ifp == ifp) {
|
|
rtcache_free((struct route *)&sc->sc_ro6);
|
|
m_freem(m);
|
|
return ENETUNREACH; /* XXX */
|
|
}
|
|
|
|
/*
|
|
* force fragmentation to minimum MTU, to avoid path MTU discovery.
|
|
* it is too painful to ask for resend of inner packet, to achieve
|
|
* path MTU discovery for encapsulated packets.
|
|
*/
|
|
error = ip6_output(m, 0, &sc->sc_ro6, IPV6_MINMTU,
|
|
(struct ip6_moptions *)NULL, (struct socket *)NULL, NULL);
|
|
|
|
return error;
|
|
}
|
|
|
|
int
|
|
ip6_etherip_input(struct mbuf *m, ...)
|
|
{
|
|
struct etherip_softc *sc;
|
|
const struct ip6_hdr *ip6;
|
|
struct sockaddr_in6 *src6, *dst6;
|
|
struct ifnet *ifp = NULL;
|
|
int off, proto;
|
|
va_list ap;
|
|
|
|
va_start(ap, m);
|
|
off = va_arg(ap, int);
|
|
proto = va_arg(ap, int);
|
|
va_end(ap);
|
|
|
|
if (proto != IPPROTO_ETHERIP) {
|
|
m_freem(m);
|
|
ip6stat.ip6s_nogif++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
ip6 = mtod(m, const struct ip6_hdr *);
|
|
|
|
/* find device configured for this packets src and dst */
|
|
LIST_FOREACH(sc, ðerip_softc_list, etherip_list) {
|
|
if( !sc->sc_src || !sc->sc_dst)
|
|
continue;
|
|
if (sc->sc_src->sa_family != AF_INET6 ||
|
|
sc->sc_dst->sa_family != AF_INET6)
|
|
continue;
|
|
|
|
src6 = (struct sockaddr_in6 *)sc->sc_src;
|
|
dst6 = (struct sockaddr_in6 *)sc->sc_dst;
|
|
|
|
if (!IN6_ARE_ADDR_EQUAL(&src6->sin6_addr, &ip6->ip6_dst) ||
|
|
!IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_src))
|
|
continue;
|
|
|
|
ifp = &sc->sc_ec.ec_if;
|
|
break;
|
|
}
|
|
|
|
/* no matching device found */
|
|
if (!ifp) {
|
|
m_freem(m);
|
|
ip6stat.ip6s_odropped++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
m_adj(m, off);
|
|
|
|
/*
|
|
* Section 4 of RFC 3378 requires that the EtherIP header of incoming
|
|
* packets is verified to contain the correct values in the version and
|
|
* reserved fields, and packets with wrong values be dropped.
|
|
*
|
|
* There is some discussion about what exactly the header should look
|
|
* like, the RFC is not very clear there. To be compatible with broken
|
|
* implementations, we don't check the header on incoming packets,
|
|
* relying on the ethernet code to filter out garbage.
|
|
*
|
|
* The header we use for sending is compatible with the original
|
|
* implementation in OpenBSD, which was used in former NetBSD versions
|
|
* and is used in FreeBSD. One Linux implementation is known to use the
|
|
* same value.
|
|
*/
|
|
m_adj(m, sizeof(struct etherip_header));
|
|
m = m_pullup(m, sizeof(struct ether_header));
|
|
if (m == NULL) {
|
|
ifp->if_ierrors++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
|
|
#if NBPFILTER > 0
|
|
if (ifp->if_bpf)
|
|
bpf_mtap(ifp->if_bpf, m);
|
|
#endif
|
|
|
|
ifp->if_ipackets++;
|
|
(ifp->if_input)(ifp, m);
|
|
|
|
return IPPROTO_DONE;
|
|
}
|