c89c8a1029
the misalignment of the IP header that prepending the EtherIP header might have caused. PR: 131921 MFC after: 1 week
453 lines
11 KiB
C
453 lines
11 KiB
C
/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 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/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_mrouting.h"
|
|
#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/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/vimage.h>
|
|
|
|
#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>
|
|
#include <netinet/vinet.h>
|
|
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#endif
|
|
|
|
#ifdef MROUTING
|
|
#include <netinet/ip_mroute.h>
|
|
#endif /* MROUTING */
|
|
|
|
#include <net/if_gif.h>
|
|
|
|
static int gif_validate4(const struct ip *, struct gif_softc *,
|
|
struct ifnet *);
|
|
|
|
extern struct domain inetdomain;
|
|
struct protosw in_gif_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = 0/* IPPROTO_IPV[46] */,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = in_gif_input,
|
|
.pr_output = (pr_output_t*)rip_output,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
|
|
#ifdef VIMAGE_GLOBALS
|
|
extern int ip_gif_ttl;
|
|
#endif
|
|
SYSCTL_V_INT(V_NET, vnet_gif, _net_inet_ip, IPCTL_GIF_TTL, gifttl,
|
|
CTLFLAG_RW, ip_gif_ttl, 0, "");
|
|
|
|
int
|
|
in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
|
|
{
|
|
INIT_VNET_GIF(ifp->if_vnet);
|
|
struct gif_softc *sc = ifp->if_softc;
|
|
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 */
|
|
struct etherip_header eiphdr;
|
|
int error, len, proto;
|
|
u_int8_t tos;
|
|
|
|
GIF_LOCK_ASSERT(sc);
|
|
|
|
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 */
|
|
case AF_LINK:
|
|
proto = IPPROTO_ETHERIP;
|
|
eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
|
|
eiphdr.eip_pad = 0;
|
|
/* prepend Ethernet-in-IP header */
|
|
M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
|
|
if (m && m->m_len < sizeof(struct etherip_header))
|
|
m = m_pullup(m, sizeof(struct etherip_header));
|
|
if (m == NULL)
|
|
return ENOBUFS;
|
|
bcopy(&eiphdr, mtod(m, struct etherip_header *),
|
|
sizeof(struct etherip_header));
|
|
break;
|
|
|
|
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 = V_ip_gif_ttl;
|
|
iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
|
|
ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
|
|
&iphdr.ip_tos, &tos);
|
|
|
|
/* prepend new IP header */
|
|
len = sizeof(struct ip);
|
|
#ifndef __NO_STRICT_ALIGNMENT
|
|
if (family == AF_LINK)
|
|
len += ETHERIP_ALIGN;
|
|
#endif
|
|
M_PREPEND(m, len, M_DONTWAIT);
|
|
if (m != NULL && m->m_len < len)
|
|
m = m_pullup(m, len);
|
|
if (m == NULL) {
|
|
printf("ENOBUFS in in_gif_output %d\n", __LINE__);
|
|
return ENOBUFS;
|
|
}
|
|
#ifndef __NO_STRICT_ALIGNMENT
|
|
if (family == AF_LINK) {
|
|
len = mtod(m, vm_offset_t) & 3;
|
|
KASSERT(len == 0 || len == ETHERIP_ALIGN,
|
|
("in_gif_output: unexpected misalignment"));
|
|
m->m_data += len;
|
|
m->m_len -= ETHERIP_ALIGN;
|
|
}
|
|
#endif
|
|
bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
|
|
|
|
M_SETFIB(m, sc->gif_fibnum);
|
|
|
|
if (dst->sin_family != sin_dst->sin_family ||
|
|
dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
|
|
/* cache route doesn't match */
|
|
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;
|
|
if (sc->gif_ro.ro_rt) {
|
|
RTFREE(sc->gif_ro.ro_rt);
|
|
sc->gif_ro.ro_rt = NULL;
|
|
}
|
|
#if 0
|
|
GIF2IFP(sc)->if_mtu = GIF_MTU;
|
|
#endif
|
|
}
|
|
|
|
if (sc->gif_ro.ro_rt == NULL) {
|
|
in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum);
|
|
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) {
|
|
m_freem(m);
|
|
return ENETUNREACH; /* XXX */
|
|
}
|
|
#if 0
|
|
ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
|
|
- sizeof(struct ip);
|
|
#endif
|
|
}
|
|
|
|
error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
|
|
|
|
if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
|
|
sc->gif_ro.ro_rt != NULL) {
|
|
RTFREE(sc->gif_ro.ro_rt);
|
|
sc->gif_ro.ro_rt = NULL;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
in_gif_input(struct mbuf *m, int off)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
struct ifnet *gifp = NULL;
|
|
struct gif_softc *sc;
|
|
struct ip *ip;
|
|
int af;
|
|
u_int8_t otos;
|
|
int proto;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
proto = ip->ip_p;
|
|
|
|
sc = (struct gif_softc *)encap_getarg(m);
|
|
if (sc == NULL) {
|
|
m_freem(m);
|
|
V_ipstat.ips_nogif++;
|
|
return;
|
|
}
|
|
|
|
gifp = GIF2IFP(sc);
|
|
if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
|
|
m_freem(m);
|
|
V_ipstat.ips_nogif++;
|
|
return;
|
|
}
|
|
|
|
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 */
|
|
case IPPROTO_ETHERIP:
|
|
af = AF_LINK;
|
|
break;
|
|
|
|
default:
|
|
V_ipstat.ips_nogif++;
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
gif_input(m, af, gifp);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* validate outer address.
|
|
*/
|
|
static int
|
|
gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
|
|
{
|
|
INIT_VNET_INET(curvnet);
|
|
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 (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
|
|
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 */
|
|
TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) {
|
|
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 ((GIF2IFP(sc)->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;
|
|
/* XXX MRT check for the interface we would use on output */
|
|
rt = in_rtalloc1((struct sockaddr *)&sin, 0,
|
|
0UL, sc->gif_fibnum);
|
|
if (!rt || rt->rt_ifp != ifp) {
|
|
#if 0
|
|
log(LOG_WARNING, "%s: packet from 0x%x dropped "
|
|
"due to ingress filter\n", if_name(GIF2IFP(sc)),
|
|
(u_int32_t)ntohl(sin.sin_addr.s_addr));
|
|
#endif
|
|
if (rt)
|
|
RTFREE_LOCKED(rt);
|
|
return 0;
|
|
}
|
|
RTFREE_LOCKED(rt);
|
|
}
|
|
|
|
return 32 * 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_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(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);
|
|
}
|
|
|
|
int
|
|
in_gif_attach(struct gif_softc *sc)
|
|
{
|
|
sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
|
|
&in_gif_protosw, sc);
|
|
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;
|
|
}
|