832f8d2249
This work was based on kame-20010528-freebsd43-snap.tgz and some
critical problem after the snap was out were fixed.
There are many many changes since last KAME merge.
TODO:
- The definitions of SADB_* in sys/net/pfkeyv2.h are still different
from RFC2407/IANA assignment because of binary compatibility
issue. It should be fixed under 5-CURRENT.
- ip6po_m member of struct ip6_pktopts is no longer used. But, it
is still there because of binary compatibility issue. It should
be removed under 5-CURRENT.
Reviewed by: itojun
Obtained from: KAME
MFC after: 3 weeks
345 lines
8.6 KiB
C
345 lines
8.6 KiB
C
/* $FreeBSD$ */
|
|
/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 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 "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
|
|
#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/queue.h>
|
|
#include <sys/syslog.h>
|
|
|
|
#include <sys/malloc.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
|
|
#include <netinet/ip_encap.h>
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/in6_gif.h>
|
|
#include <netinet6/in6_var.h>
|
|
#endif
|
|
#include <netinet/ip_ecn.h>
|
|
#ifdef INET6
|
|
#include <netinet6/ip6_ecn.h>
|
|
#endif
|
|
|
|
#include <net/if_gif.h>
|
|
|
|
#include <net/net_osdep.h>
|
|
|
|
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 ip6_hdr *ip6;
|
|
int proto;
|
|
u_int8_t itos, otos;
|
|
|
|
if (sin6_src == NULL || sin6_dst == NULL ||
|
|
sin6_src->sin6_family != AF_INET6 ||
|
|
sin6_dst->sin6_family != AF_INET6) {
|
|
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 *);
|
|
itos = ip->ip_tos;
|
|
break;
|
|
}
|
|
#endif
|
|
#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 *);
|
|
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
#ifdef DEBUG
|
|
printf("in6_gif_output: warning: unknown family %d passed\n",
|
|
family);
|
|
#endif
|
|
m_freem(m);
|
|
return EAFNOSUPPORT;
|
|
}
|
|
|
|
/* 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) {
|
|
printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
|
|
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_plen = htons((u_short)m->m_pkthdr.len);
|
|
ip6->ip6_nxt = proto;
|
|
ip6->ip6_hlim = ip6_gif_hlim;
|
|
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 (ifp->if_flags & IFF_LINK1)
|
|
ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
|
|
else
|
|
ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
|
|
ip6->ip6_flow &= ~ntohl(0xff00000);
|
|
ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
|
|
|
|
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 0
|
|
sc->gif_if.if_mtu = GIF_MTU;
|
|
#endif
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* if it constitutes infinite encapsulation, punt. */
|
|
if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
|
|
m_freem(m);
|
|
return ENETUNREACH; /*XXX*/
|
|
}
|
|
#if 0
|
|
ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
|
|
- sizeof(struct ip6_hdr);
|
|
#endif
|
|
}
|
|
|
|
#ifdef IPV6_MINMTU
|
|
/*
|
|
* 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.
|
|
*/
|
|
return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL));
|
|
#else
|
|
return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
|
|
#endif
|
|
}
|
|
|
|
int in6_gif_input(mp, offp, proto)
|
|
struct mbuf **mp;
|
|
int *offp, proto;
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ifnet *gifp = NULL;
|
|
struct ip6_hdr *ip6;
|
|
int af = 0;
|
|
u_int32_t otos;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
gifp = (struct ifnet *)encap_getarg(m);
|
|
|
|
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
|
|
m_freem(m);
|
|
ip6stat.ip6s_nogif++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
otos = ip6->ip6_flow;
|
|
m_adj(m, *offp);
|
|
|
|
switch (proto) {
|
|
#ifdef INET
|
|
case IPPROTO_IPV4:
|
|
{
|
|
struct ip *ip;
|
|
u_int8_t otos8;
|
|
af = AF_INET;
|
|
otos8 = (ntohl(otos) >> 20) & 0xff;
|
|
if (m->m_len < sizeof(*ip)) {
|
|
m = m_pullup(m, sizeof(*ip));
|
|
if (!m)
|
|
return IPPROTO_DONE;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
if (gifp->if_flags & IFF_LINK1)
|
|
ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
|
|
else
|
|
ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
|
|
break;
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case IPPROTO_IPV6:
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
af = AF_INET6;
|
|
if (m->m_len < sizeof(*ip6)) {
|
|
m = m_pullup(m, sizeof(*ip6));
|
|
if (!m)
|
|
return IPPROTO_DONE;
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (gifp->if_flags & IFF_LINK1)
|
|
ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
|
|
else
|
|
ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
ip6stat.ip6s_nogif++;
|
|
m_freem(m);
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
gif_input(m, af, gifp);
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
/*
|
|
* we know that we are in IFF_UP, outer address available, and outer family
|
|
* matched the physical addr family. see gif_encapcheck().
|
|
*/
|
|
int
|
|
gif_encapcheck6(m, off, proto, arg)
|
|
const struct mbuf *m;
|
|
int off;
|
|
int proto;
|
|
void *arg;
|
|
{
|
|
struct ip6_hdr ip6;
|
|
struct gif_softc *sc;
|
|
struct sockaddr_in6 *src, *dst;
|
|
int addrmatch;
|
|
|
|
/* sanity check done in caller */
|
|
sc = (struct gif_softc *)arg;
|
|
src = (struct sockaddr_in6 *)sc->gif_psrc;
|
|
dst = (struct sockaddr_in6 *)sc->gif_pdst;
|
|
|
|
/* LINTED const cast */
|
|
m_copydata((struct mbuf *)m, 0, sizeof(ip6), (caddr_t)&ip6);
|
|
|
|
/* check for address match */
|
|
addrmatch = 0;
|
|
if (IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6.ip6_dst))
|
|
addrmatch |= 1;
|
|
if (IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6.ip6_src))
|
|
addrmatch |= 2;
|
|
if (addrmatch != 3)
|
|
return 0;
|
|
|
|
/* martian filters on outer source - done in ip6_input */
|
|
|
|
/* ingress filters on outer source */
|
|
if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
|
|
(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
|
|
struct sockaddr_in6 sin6;
|
|
struct rtentry *rt;
|
|
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6.sin6_addr = ip6.ip6_src;
|
|
/* XXX scopeid */
|
|
rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
|
|
if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
|
|
#if 0
|
|
log(LOG_WARNING, "%s: packet from %s dropped "
|
|
"due to ingress filter\n", if_name(&sc->gif_if),
|
|
ip6_sprintf(&sin6.sin6_addr));
|
|
#endif
|
|
if (rt)
|
|
rtfree(rt);
|
|
return 0;
|
|
}
|
|
rtfree(rt);
|
|
}
|
|
|
|
return 128 * 2;
|
|
}
|