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/* $OpenBSD: in6_gif.c,v 1.21 2002/05/30 04:19:44 itojun Exp $ */
/* $KAME: in6_gif.c,v 1.43 2001/01/22 07:27:17 itojun Exp $ */
/*
* 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/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/protosw.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip_ipsp.h>
#ifdef INET
#include <netinet/ip.h>
#endif
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <netinet/ip_ecn.h>
#include <net/if_gif.h>
#include "bridge.h"
#ifndef offsetof
#define offsetof(s, e) ((int)&((s *)0)->e)
#endif
int
in6_gif_output(ifp, family, m, rt)
struct ifnet *ifp;
int family; /* family of the packet to be encapsulate. */
struct mbuf *m;
struct rtentry *rt;
{
struct gif_softc *sc = (struct gif_softc*)ifp;
struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
struct tdb tdb;
struct xformsw xfs;
int error;
int hlen, poff;
struct mbuf *mp;
if (sin6_src == NULL || sin6_dst == NULL ||
sin6_src->sin6_family != AF_INET6 ||
sin6_dst->sin6_family != AF_INET6) {
m_freem(m);
return EAFNOSUPPORT;
}
/* setup dummy tdb. it highly depends on ipip_output() code. */
bzero(&tdb, sizeof(tdb));
bzero(&xfs, sizeof(xfs));
tdb.tdb_src.sin6.sin6_family = AF_INET6;
tdb.tdb_src.sin6.sin6_len = sizeof(struct sockaddr_in6);
tdb.tdb_src.sin6.sin6_addr = sin6_src->sin6_addr;
tdb.tdb_dst.sin6.sin6_family = AF_INET6;
tdb.tdb_dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
tdb.tdb_dst.sin6.sin6_addr = sin6_dst->sin6_addr;
tdb.tdb_xform = &xfs;
xfs.xf_type = -1; /* not XF_IP4 */
switch (family) {
#ifdef INET
case AF_INET:
{
if (m->m_len < sizeof(struct ip)) {
m = m_pullup(m, sizeof(struct ip));
if (m == NULL)
return ENOBUFS;
}
hlen = (mtod(m, struct ip *)->ip_hl) << 2;
poff = offsetof(struct ip, ip_p);
break;
}
#endif
#ifdef INET6
case AF_INET6:
{
hlen = sizeof(struct ip6_hdr);
poff = offsetof(struct ip6_hdr, ip6_nxt);
break;
}
#endif
#if NBRIDGE > 0
case AF_LINK:
break;
#endif /* NBRIDGE */
default:
#ifdef DEBUG
printf("in6_gif_output: warning: unknown family %d passed\n",
family);
#endif
m_freem(m);
return EAFNOSUPPORT;
}
#if NBRIDGE > 0
if (family == AF_LINK) {
mp = NULL;
error = etherip_output(m, &tdb, &mp, 0, 0);
if (error)
return error;
else if (mp == NULL)
return EFAULT;
m = mp;
goto sendit;
}
#endif /* NBRIDGE */
/* encapsulate into IPv6 packet */
mp = NULL;
error = ipip_output(m, &tdb, &mp, hlen, poff);
if (error)
return error;
else if (mp == NULL)
return EFAULT;
m = mp;
#if NBRIDGE > 0
sendit:
#endif /* NBRIDGE */
/* See if out cached route remains the same */
if (dst->sin6_family != sin6_dst->sin6_family ||
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
/* cache route doesn't match */
bzero(dst, sizeof(*dst));
dst->sin6_family = sin6_dst->sin6_family;
dst->sin6_len = sizeof(struct sockaddr_in6);
dst->sin6_addr = sin6_dst->sin6_addr;
if (sc->gif_ro6.ro_rt) {
RTFREE(sc->gif_ro6.ro_rt);
sc->gif_ro6.ro_rt = NULL;
}
}
if (sc->gif_ro6.ro_rt == NULL) {
rtalloc((struct route *)&sc->gif_ro6);
if (sc->gif_ro6.ro_rt == NULL) {
m_freem(m);
return ENETUNREACH;
}
}
/*
* 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->gif_ro6, IPV6_MINMTU, 0, NULL);
return error;
}
int in6_gif_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp;
struct gif_softc *sc;
struct ifnet *gifp = NULL;
struct ip6_hdr *ip6;
int i;
/* XXX What if we run transport-mode IPsec to protect gif tunnel ? */
if (m->m_flags & (M_AUTH | M_CONF))
goto inject;
ip6 = mtod(m, struct ip6_hdr *);
#define satoin6(sa) (((struct sockaddr_in6 *)(sa))->sin6_addr)
for (i = 0, sc = gif_softc; i < ngif; i++, sc++) {
if (sc->gif_psrc == NULL || sc->gif_pdst == NULL ||
sc->gif_psrc->sa_family != AF_INET6 ||
sc->gif_pdst->sa_family != AF_INET6) {
continue;
}
if ((sc->gif_if.if_flags & IFF_UP) == 0)
continue;
if (IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) &&
IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_pdst), &ip6->ip6_src)) {
gifp = &sc->gif_if;
break;
}
}
if (gifp) {
m->m_pkthdr.rcvif = gifp;
gifp->if_ipackets++;
gifp->if_ibytes += m->m_pkthdr.len;
ipip_input(m, *offp, gifp);
return IPPROTO_DONE;
}
inject:
/* No GIF tunnel configured */
ip4_input6(&m, offp, 0); /* XXX last argument ignored */
return IPPROTO_DONE;
}
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