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NetBSD/sys/netinet6/in6_gif.c

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/* $NetBSD: in6_gif.c,v 1.27 2001/12/21 06:30:44 itojun Exp $ */
/* $KAME: in6_gif.c,v 1.62 2001/07/29 04:27:25 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: in6_gif.c,v 1.27 2001/12/21 06:30:44 itojun Exp $");
#include "opt_inet.h"
#include "opt_iso.h"
/* define it if you want to use encap_attach_func (it helps *BSD merge) */
#define USE_ENCAPCHECK
#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/queue.h>
#include <sys/syslog.h>
#include <sys/protosw.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 <netinet6/ip6protosw.h>
#include <netinet/ip_ecn.h>
#include <net/if_gif.h>
#include <net/net_osdep.h>
static int gif_validate6 __P((const struct ip6_hdr *, struct gif_softc *,
struct ifnet *));
int ip6_gif_hlim = GIF_HLIM;
extern struct domain inet6domain;
struct ip6protosw in6_gif_protosw =
{ SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
in6_gif_input, rip6_output, in6_gif_ctlinput, rip6_ctloutput,
rip6_usrreq,
0, 0, 0, 0,
};
extern LIST_HEAD(, gif_softc) gif_softc_list;
int
in6_gif_output(ifp, family, m)
struct ifnet *ifp;
int family; /* family of the packet to be encapsulate. */
struct mbuf *m;
{
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, error;
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
#ifdef ISO
case AF_ISO:
proto = IPPROTO_EON;
itos = 0;
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)
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 (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 */
}
}
#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.
*/
error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL);
#else
error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL);
#endif
return(error);
}
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;
}
#ifndef USE_ENCAPCHECK
if (!gif_validate6(ip6, (struct gif_softc *)gifp, m->m_pkthdr.rcvif)) {
m_freem(m);
ip6stat.ip6s_nogif++;
return IPPROTO_DONE;
}
#endif
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
#ifdef ISO
case IPPROTO_EON:
af = AF_ISO;
break;
#endif
default:
ip6stat.ip6s_nogif++;
m_freem(m);
return IPPROTO_DONE;
}
gif_input(m, af, gifp);
return IPPROTO_DONE;
}
/*
* validate outer address.
*/
static int
gif_validate6(ip6, sc, ifp)
const struct ip6_hdr *ip6;
struct gif_softc *sc;
struct ifnet *ifp;
{
struct sockaddr_in6 *src, *dst;
src = (struct sockaddr_in6 *)sc->gif_psrc;
dst = (struct sockaddr_in6 *)sc->gif_pdst;
/* check for address match */
if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
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 && ifp) {
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);
if (!rt || rt->rt_ifp != ifp) {
#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;
}
/*
* 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 ifnet *ifp;
/* sanity check done in caller */
sc = (struct gif_softc *)arg;
/* LINTED const cast */
m_copydata((struct mbuf *)m, 0, sizeof(ip6), (caddr_t)&ip6);
ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
return gif_validate6(&ip6, sc, ifp);
}
int
in6_gif_attach(sc)
struct gif_softc *sc;
{
#ifndef USE_ENCAPCHECK
struct sockaddr_in6 mask6;
bzero(&mask6, sizeof(mask6));
mask6.sin6_len = sizeof(struct sockaddr_in6);
mask6.sin6_addr.s6_addr32[0] = mask6.sin6_addr.s6_addr32[1] =
mask6.sin6_addr.s6_addr32[2] = mask6.sin6_addr.s6_addr32[3] = ~0;
if (!sc->gif_psrc || !sc->gif_pdst)
return EINVAL;
sc->encap_cookie6 = encap_attach(AF_INET6, -1, sc->gif_psrc,
(struct sockaddr *)&mask6, sc->gif_pdst, (struct sockaddr *)&mask6,
(struct protosw *)&in6_gif_protosw, sc);
#else
sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
(struct protosw *)&in6_gif_protosw, sc);
#endif
if (sc->encap_cookie6 == NULL)
return EEXIST;
return 0;
}
int
in6_gif_detach(sc)
struct gif_softc *sc;
{
int error;
error = encap_detach(sc->encap_cookie6);
if (error == 0)
sc->encap_cookie6 = NULL;
return error;
}
void
in6_gif_ctlinput(cmd, sa, d)
int cmd;
struct sockaddr *sa;
void *d;
{
struct gif_softc *sc;
struct ip6ctlparam *ip6cp = NULL;
struct mbuf *m;
struct ip6_hdr *ip6;
int off;
void *cmdarg;
const struct sockaddr_in6 *sa6_src = NULL;
struct sockaddr_in6 *dst6;
if (sa->sa_family != AF_INET6 ||
sa->sa_len != sizeof(struct sockaddr_in6))
return;
if ((unsigned)cmd >= PRC_NCMDS)
return;
if (cmd == PRC_HOSTDEAD)
d = NULL;
else if (inet6ctlerrmap[cmd] == 0)
return;
/* if the parameter is from icmp6, decode it. */
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
cmdarg = ip6cp->ip6c_cmdarg;
sa6_src = ip6cp->ip6c_src;
} else {
m = NULL;
ip6 = NULL;
cmdarg = NULL;
sa6_src = &sa6_any;
}
if (!ip6)
return;
/*
* for now we don't care which type it was, just flush the route cache.
* XXX slow. sc (or sc->encap_cookie6) should be passed from
* ip_encap.c.
*/
for (sc = LIST_FIRST(&gif_softc_list); sc;
sc = LIST_NEXT(sc, gif_list)) {
if ((sc->gif_if.if_flags & IFF_RUNNING) == 0)
continue;
if (sc->gif_psrc->sa_family != AF_INET6)
continue;
if (!sc->gif_ro6.ro_rt)
continue;
dst6 = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
/* XXX scope */
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr)) {
/* flush route cache */
RTFREE(sc->gif_ro6.ro_rt);
sc->gif_ro6.ro_rt = NULL;
}
}
}
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