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/* $OpenBSD: in_gif.c,v 1.23 2002/03/15 18:19:52 millert Exp $ */
/* $KAME: in_gif.c,v 1.50 2001/01/22 07:27:16 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/mbuf.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_gif.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_gif.h>
#include <netinet/ip_ipsp.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#ifdef MROUTING
#include <netinet/ip_mroute.h>
#endif /* MROUTING */
#include "gif.h"
#include "bridge.h"
int
in_gif_output(ifp, family, m, rt)
struct ifnet *ifp;
int family;
struct mbuf *m;
struct rtentry *rt;
{
register struct gif_softc *sc = (struct gif_softc*)ifp;
struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
struct tdb tdb;
struct xformsw xfs;
int error;
int hlen, poff;
u_int16_t plen;
struct mbuf *mp;
if (sin_src == NULL || sin_dst == NULL ||
sin_src->sin_family != AF_INET ||
sin_dst->sin_family != AF_INET) {
m_freem(m);
return EAFNOSUPPORT;
}
/* multi-destination mode is not supported */
if (ifp->if_flags & IFF_LINK0) {
m_freem(m);
return ENETUNREACH;
}
/* setup dummy tdb. it highly depends on ipipoutput() code. */
bzero(&tdb, sizeof(tdb));
bzero(&xfs, sizeof(xfs));
tdb.tdb_src.sin.sin_family = AF_INET;
tdb.tdb_src.sin.sin_len = sizeof(struct sockaddr_in);
tdb.tdb_src.sin.sin_addr = sin_src->sin_addr;
tdb.tdb_dst.sin.sin_family = AF_INET;
tdb.tdb_dst.sin.sin_len = sizeof(struct sockaddr_in);
tdb.tdb_dst.sin.sin_addr = sin_dst->sin_addr;
tdb.tdb_xform = &xfs;
xfs.xf_type = -1; /* not XF_IP4 */
switch (family) {
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;
#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("in_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 IPv4 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 */
/* ip_output needs host-order length. it should be nuked */
m_copydata(m, offsetof(struct ip, ip_len), sizeof(u_int16_t),
(caddr_t) &plen);
NTOHS(plen);
m_copyback(m, offsetof(struct ip, ip_len), sizeof(u_int16_t),
(caddr_t) &plen);
return ip_output(m, NULL, NULL, 0, NULL, NULL);
}
void
in_gif_input(struct mbuf *m, ...)
{
int off;
struct gif_softc *sc;
struct ifnet *gifp = NULL;
struct ip *ip;
int i;
va_list ap;
va_start(ap, m);
off = va_arg(ap, int);
va_end(ap);
/* XXX what if we run transport-mode IPsec to protect gif tunnel ? */
if (m->m_flags & (M_AUTH | M_CONF))
goto inject;
ip = mtod(m, struct ip *);
/* this code will be soon improved. */
#define satosin(sa) ((struct sockaddr_in *)(sa))
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_INET
|| sc->gif_pdst->sa_family != AF_INET) {
continue;
}
if ((sc->gif_if.if_flags & IFF_UP) == 0)
continue;
if ((sc->gif_if.if_flags & IFF_LINK0)
&& satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
&& satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) {
gifp = &sc->gif_if;
continue;
}
if (satosin(sc->gif_psrc)->sin_addr.s_addr ==
ip->ip_dst.s_addr
&& satosin(sc->gif_pdst)->sin_addr.s_addr ==
ip->ip_src.s_addr)
{
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, off, gifp); /* We have a configured GIF */
return;
}
inject:
ip4_input(m, off); /* No GIF interface was configured */
return;
}
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