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/* $OpenBSD: in_gif.c,v 1.37 2009/11/21 14:08:14 claudio 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 "pf.h"
#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
#include "gif.h"
#include "bridge.h"
#if NPF > 0
#include <net/pfvar.h>
#endif
int
in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
{
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;
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;
}
#ifdef DIAGNOSTIC
if (ifp->if_rdomain != rtable_l2(m->m_pkthdr.rdomain)) {
printf("%s: trying to send packet on wrong domain. "
"if %d vs. mbuf %d, AF %d\n", ifp->if_xname,
ifp->if_rdomain, rtable_l2(m->m_pkthdr.rdomain));
}
#endif
/* 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:
break;
#ifdef INET6
case AF_INET6:
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;
}
/* encapsulate into IPv4 packet */
mp = NULL;
#if NBRIDGE > 0
if (family == AF_LINK)
error = etherip_output(m, &tdb, &mp, 0, 0);
else
#endif /* NBRIDGE */
error = ipip_output(m, &tdb, &mp, 0, 0);
if (error)
return error;
else if (mp == NULL)
return EFAULT;
m = mp;
m->m_pkthdr.rdomain = sc->gif_rtableid;
#if NPF > 0
pf_pkt_addr_changed(m);
#endif
return ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
(void *)NULL);
}
void
in_gif_input(struct mbuf *m, ...)
{
int off;
struct gif_softc *sc;
struct ifnet *gifp = NULL;
struct ip *ip;
va_list ap;
va_start(ap, m);
off = va_arg(ap, int);
va_end(ap);
/* IP-in-IP header is caused by tunnel mode, so skip gif lookup */
if (m->m_flags & M_TUNNEL) {
m->m_flags &= ~M_TUNNEL;
goto inject;
}
ip = mtod(m, struct ip *);
/* this code will be soon improved. */
LIST_FOREACH(sc, &gif_softc_list, gif_list) {
if (sc->gif_psrc == NULL || sc->gif_pdst == NULL ||
sc->gif_psrc->sa_family != AF_INET ||
sc->gif_pdst->sa_family != AF_INET ||
rtable_l2(sc->gif_rtableid) !=
rtable_l2(m->m_pkthdr.rdomain)) {
continue;
}
if ((sc->gif_if.if_flags & IFF_UP) == 0)
continue;
if (in_hosteq(satosin(sc->gif_psrc)->sin_addr, ip->ip_dst) &&
in_hosteq(satosin(sc->gif_pdst)->sin_addr, ip->ip_src)) {
gifp = &sc->gif_if;
break;
}
}
if (gifp) {
m->m_pkthdr.rcvif = gifp;
m->m_pkthdr.rdomain = gifp->if_rdomain;
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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