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/* $KAME: in_gif.c,v 1.101 2007/06/14 13:51:33 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.
*/
#ifdef __FreeBSD__
#include "opt_mrouting.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#endif
#ifdef __NetBSD__
#include "opt_inet.h"
#include "opt_iso.h"
#endif
#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/kernel.h>
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#endif
#ifndef __FreeBSD__
#include <sys/ioctl.h>
#endif
#include <sys/syslog.h>
#include <sys/protosw.h>
#ifdef __FreeBSD__
#include <sys/malloc.h>
#endif
#include <net/if.h>
#include <net/route.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/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_ecn.h>
#ifdef __OpenBSD__
#include <netinet/ip_ipsp.h>
#endif
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <net/if_gif.h>
#include "gif.h"
#ifdef __OpenBSD__
#include "bridge.h"
#endif
#ifndef __OpenBSD__ /* version??? */
#include <machine/stdarg.h>
#endif
#include <net/net_osdep.h>
static int gif_validate4(const struct ip *, struct gif_softc *,
struct ifnet *);
#if NGIF > 0
int ip_gif_ttl = GIF_TTL;
#else
int ip_gif_ttl = 0;
#endif
#ifndef __OpenBSD__
static int in_gif_rtcachettl = 300; /* XXX appropriate value? configurable? */
#endif
#ifdef __FreeBSD__
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
&ip_gif_ttl, 0, "");
#endif
extern struct domain inetdomain;
struct protosw in_gif_protosw =
{ SOCK_RAW, &inetdomain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
in_gif_input,
#ifdef __FreeBSD__
(pr_output_t*)rip_output,
#else
rip_output,
#endif
0, rip_ctloutput,
#ifdef __FreeBSD__
0,
#else
rip_usrreq,
#endif
0, 0, 0, 0,
#ifdef __FreeBSD__
&rip_usrreqs
#endif
};
#ifndef offsetof
#define offsetof(s, e) ((int)&((s *)0)->e)
#endif
int
in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
{
#ifdef __OpenBSD__
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;
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;
}
/* 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 */
return ip_output(m, NULL, NULL, 0, NULL, NULL);
#else /* !OpenBSD */
struct gif_softc *sc = (struct gif_softc*)ifp;
struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
struct ip iphdr; /* capsule IP header, host byte ordered */
int proto, error;
u_int8_t tos;
#ifdef __FreeBSD__
struct timeval mono_time;
#endif
if (sin_src == NULL || sin_dst == NULL ||
sin_src->sin_family != AF_INET ||
sin_dst->sin_family != AF_INET) {
m_freem(m);
return EAFNOSUPPORT;
}
switch (family) {
#ifdef INET
case AF_INET:
{
struct ip *ip;
proto = IPPROTO_IPV4;
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m)
return ENOBUFS;
}
ip = mtod(m, struct ip *);
tos = ip->ip_tos;
break;
}
#endif /* INET */
#ifdef INET6
case AF_INET6:
{
struct ip6_hdr *ip6;
proto = IPPROTO_IPV6;
if (m->m_len < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m)
return ENOBUFS;
}
ip6 = mtod(m, struct ip6_hdr *);
tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
break;
}
#endif /* INET6 */
#if defined(__NetBSD__) && defined(ISO)
case AF_ISO:
proto = IPPROTO_EON;
tos = 0;
break;
#endif
default:
#ifdef DEBUG
printf("in_gif_output: warning: unknown family %d passed\n",
family);
#endif
m_freem(m);
return EAFNOSUPPORT;
}
bzero(&iphdr, sizeof(iphdr));
iphdr.ip_src = sin_src->sin_addr;
/* bidirectional configured tunnel mode */
if (sin_dst->sin_addr.s_addr != INADDR_ANY)
iphdr.ip_dst = sin_dst->sin_addr;
else {
m_freem(m);
return ENETUNREACH;
}
iphdr.ip_p = proto;
/* version will be set in ip_output() */
iphdr.ip_ttl = ip_gif_ttl;
#ifdef __NetBSD__
iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
#else
iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
#endif
ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
&iphdr.ip_tos, &tos);
/* prepend new IP header */
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
if (m && m->m_len < sizeof(struct ip))
m = m_pullup(m, sizeof(struct ip));
if (m == NULL)
return ENOBUFS;
bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
#ifdef __FreeBSD__
microtime(&mono_time);
#endif
/*
* Check if the cached route is still valid. If not, create another
* one.
* XXX: we should be able to let ip_output() to validate the cache
* and to make a new route (see in6_gif_output()). However, FreeBSD's
* ip_output() does not make a clone for the new route, while we'd
* like do so in case of route changes. Thus, we reluctantly put
* almost duplicated logic here.
*/
if (sc->gif_ro.ro_rt && (!(sc->gif_ro.ro_rt->rt_flags & RTF_UP) ||
dst->sin_family != sin_dst->sin_family ||
dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr ||
sc->rtcache_expire == 0 || mono_time.tv_sec >= sc->rtcache_expire)) {
/*
* The cache route doesn't match, has been invalidated, or has
* expired.
*/
RTFREE(sc->gif_ro.ro_rt);
sc->gif_ro.ro_rt = NULL;
}
if (sc->gif_ro.ro_rt == NULL) {
bzero(dst, sizeof(*dst));
dst->sin_family = sin_dst->sin_family;
dst->sin_len = sizeof(struct sockaddr_in);
dst->sin_addr = sin_dst->sin_addr;
rtalloc(&sc->gif_ro);
if (sc->gif_ro.ro_rt == NULL) {
m_freem(m);
return ENETUNREACH;
}
/* if it constitutes infinite encapsulation, punt. */
if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
RTFREE(sc->gif_ro.ro_rt);
sc->gif_ro.ro_rt = NULL;
m_freem(m);
return ENETUNREACH; /* XXX */
}
sc->rtcache_expire = mono_time.tv_sec + in_gif_rtcachettl;
}
error = ip_output(m, NULL, &sc->gif_ro, 0, NULL
#if defined(__FreeBSD__) || defined(__NetBSD__)
, NULL
#endif
);
return (error);
#endif /* OpenBSD */
}
void
#ifdef __FreeBSD__
in_gif_input(struct mbuf *m, int off)
#else
#if __STDC__
in_gif_input(struct mbuf *m, ...)
#else
in_gif_input(struct mbuf *m, va_alist)
#endif
#endif
{
#ifndef __FreeBSD__
int off, proto;
va_list ap;
#else
int proto;
#endif
struct ifnet *gifp = NULL;
struct ip *ip;
#ifndef __OpenBSD__
int af;
u_int8_t otos;
#endif
#if defined(__NetBSD__) || defined(__OpenBSD__)
va_start(ap, m);
off = va_arg(ap, int);
#if !defined(__OpenBSD__)
proto = va_arg(ap, int);
#endif
va_end(ap);
#endif
ip = mtod(m, struct ip *);
#if defined(__OpenBSD__) || defined(__FreeBSD__)
proto = ip->ip_p;
#endif
gifp = (struct ifnet *)encap_getarg(m);
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
m_freem(m);
ipstat.ips_nogif++;
return;
}
#ifndef GIF_ENCAPCHECK
if (!gif_validate4(ip, (struct gif_softc *)gifp, m->m_pkthdr.rcvif)) {
m_freem(m);
ipstat.ips_nogif++;
return;
}
#endif
#ifdef __OpenBSD__
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;
#else
otos = ip->ip_tos;
m_adj(m, off);
switch (proto) {
#ifdef INET
case IPPROTO_IPV4:
{
struct ip *ip;
af = AF_INET;
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m)
return;
}
ip = mtod(m, struct ip *);
if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
ECN_ALLOWED : ECN_NOCARE,
&otos, &ip->ip_tos) == 0) {
m_freem(m);
return;
}
break;
}
#endif
#ifdef INET6
case IPPROTO_IPV6:
{
struct ip6_hdr *ip6;
u_int8_t itos, oitos;
af = AF_INET6;
if (m->m_len < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m)
return;
}
ip6 = mtod(m, struct ip6_hdr *);
itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
ECN_ALLOWED : ECN_NOCARE,
&otos, &itos) == 0) {
m_freem(m);
return;
}
if (itos != oitos) {
ip6->ip6_flow &= ~htonl(0xff << 20);
ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
}
break;
}
#endif /* INET6 */
#if defined(__NetBSD__) && defined(ISO)
case IPPROTO_EON:
af = AF_ISO;
break;
#endif
default:
ipstat.ips_nogif++;
m_freem(m);
return;
}
gif_input(m, af, gifp);
return;
#endif /* OpenBSD */
}
/*
* validate outer address.
*/
static int
gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
{
struct sockaddr_in *src, *dst;
struct in_ifaddr *ia4;
src = (struct sockaddr_in *)sc->gif_psrc;
dst = (struct sockaddr_in *)sc->gif_pdst;
/* check for address match */
if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
dst->sin_addr.s_addr != ip->ip_src.s_addr)
return 0;
/* martian filters on outer source - NOT done in ip_input! */
#if defined(__OpenBSD__) || defined(__NetBSD__)
if (IN_MULTICAST(ip->ip_src.s_addr))
#else
if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
#endif
return 0;
switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
case 0: case 127: case 255:
return 0;
}
/* reject packets with broadcast on source */
#if defined(__OpenBSD__)
for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next)
#elif defined(__NetBSD__)
TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list)
#elif defined(__FreeBSD__)
for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
ia4 = TAILQ_NEXT(ia4, ia_link))
#else
for (ia4 = in_ifaddr; ia4 != NULL; ia4 = ia4->ia_next)
#endif
{
if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
continue;
if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
return 0;
}
/* ingress filters on outer source */
if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
struct sockaddr_in sin;
struct rtentry *rt;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_addr = ip->ip_src;
#ifdef __FreeBSD__
rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
#else
rt = rtalloc1((struct sockaddr *)&sin, 0);
#endif
if (!rt || rt->rt_ifp != ifp) {
#if 0
log(LOG_WARNING, "%s: packet from 0x%x dropped "
"due to ingress filter\n", if_name(&sc->gif_if),
(u_int32_t)ntohl(sin.sin_addr.s_addr));
#endif
if (rt)
rtfree(rt);
return 0;
}
rtfree(rt);
}
return 32 * 2;
}
#ifdef GIF_ENCAPCHECK
/*
* we know that we are in IFF_UP, outer address available, and outer family
* matched the physical addr family. see gif_encapcheck().
*/
int
gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
{
struct ip ip;
struct gif_softc *sc;
struct ifnet *ifp;
/* sanity check done in caller */
sc = (struct gif_softc *)arg;
/* LINTED const cast */
m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
return gif_validate4(&ip, sc, ifp);
}
#endif
int
in_gif_attach(struct gif_softc *sc)
{
#ifndef GIF_ENCAPCHECK
struct sockaddr_in mask4;
bzero(&mask4, sizeof(mask4));
mask4.sin_len = sizeof(struct sockaddr_in);
mask4.sin_addr.s_addr = ~0;
if (!sc->gif_psrc || !sc->gif_pdst)
return EINVAL;
sc->encap_cookie4 = encap_attach(AF_INET, -1, sc->gif_psrc,
(struct sockaddr *)&mask4, sc->gif_pdst, (struct sockaddr *)&mask4,
(struct protosw *)&in_gif_protosw, sc);
#else
sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
&in_gif_protosw, sc);
#endif
if (sc->encap_cookie4 == NULL)
return EEXIST;
return 0;
}
int
in_gif_detach(struct gif_softc *sc)
{
int error;
error = encap_detach(sc->encap_cookie4);
if (error == 0)
sc->encap_cookie4 = NULL;
return error;
}
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