NetBSD/sys/netinet/in_gif.c

426 lines
10 KiB
C
Raw Normal View History

/* $NetBSD: in_gif.c,v 1.15 2000/07/05 21:01:38 thorpej Exp $ */
/* $KAME: in_gif.c,v 1.39 2000/04/26 05:33:31 itojun Exp $ */
1999-07-04 01:24:45 +04:00
/*
* 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.
*/
/*
* in_gif.c
*/
#ifdef __FreeBSD__
#include "opt_mrouting.h"
#endif
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.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>
#ifdef __FreeBSD__
#include <sys/kernel.h>
#include <sys/sysctl.h>
#endif
#if !defined(__FreeBSD__) || __FreeBSD__ < 3
#include <sys/ioctl.h>
#endif
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#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
#ifdef MROUTING
#include <netinet/ip_mroute.h>
#endif /* MROUTING */
#include <net/if_gif.h>
#include "gif.h"
#include <machine/stdarg.h>
#include <net/net_osdep.h>
#if NGIF > 0
int ip_gif_ttl = GIF_TTL;
#else
int ip_gif_ttl = 0;
#endif
#ifdef __FreeBSD__
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
&ip_gif_ttl, 0, "");
#endif
int
in_gif_output(ifp, family, m, rt)
struct ifnet *ifp;
int family;
struct mbuf *m;
struct rtentry *rt;
{
register 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;
if (sin_src == NULL || sin_dst == NULL ||
sin_src->sin_family != AF_INET ||
sin_dst->sin_family != AF_INET) {
m_freem(m);
return EAFNOSUPPORT;
}
bzero(&iphdr, sizeof(iphdr));
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;
/* RFCs 1853, 2003, 2401 -- copy the DF bit. */
iphdr.ip_off |= (ntohs(ip->ip_off) & IP_DF);
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*/
default:
2000-02-07 09:15:16 +03:00
#ifdef DEBUG
printf("in_gif_output: warning: unknown family %d passed\n",
family);
#endif
m_freem(m);
return EAFNOSUPPORT;
}
iphdr.ip_src = sin_src->sin_addr;
if (ifp->if_flags & IFF_LINK0) {
/* multi-destination mode */
if (sin_dst->sin_addr.s_addr != INADDR_ANY)
iphdr.ip_dst = sin_dst->sin_addr;
else if (rt) {
if (family != AF_INET) {
m_freem(m);
return EINVAL; /*XXX*/
}
iphdr.ip_dst = ((struct sockaddr_in *)
(rt->rt_gateway))->sin_addr;
} else {
m_freem(m);
return ENETUNREACH;
}
} else {
/* 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;
iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
if (ifp->if_flags & IFF_LINK1)
ip_ecn_ingress(ECN_ALLOWED, &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) {
printf("ENOBUFS in in_gif_output %d\n", __LINE__);
return ENOBUFS;
}
bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
if (dst->sin_family != sin_dst->sin_family ||
dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
/* cache route doesn't match */
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
sc->gif_if.if_mtu = GIF_MTU;
#endif
}
if (sc->gif_ro.ro_rt == NULL) {
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) {
m_freem(m);
return ENETUNREACH; /*XXX*/
}
#if 0
ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
- sizeof(struct ip);
#endif
}
#ifndef __OpenBSD__
error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
#else
error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
#endif
return(error);
}
void
#if __STDC__
in_gif_input(struct mbuf *m, ...)
#else
in_gif_input(m, va_alist)
struct mbuf *m;
va_dcl
#endif
{
int off, proto;
struct ifnet *gifp = NULL;
struct ip *ip;
int af;
va_list ap;
u_int8_t otos;
va_start(ap, m);
off = va_arg(ap, int);
#ifndef __OpenBSD__
proto = va_arg(ap, int);
#endif
va_end(ap);
ip = mtod(m, struct ip *);
#ifdef __OpenBSD__
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;
}
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 (gifp->if_flags & IFF_LINK1)
ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
break;
}
#endif
#ifdef INET6
case IPPROTO_IPV6:
{
struct ip6_hdr *ip6;
u_int8_t itos;
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 = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
if (gifp->if_flags & IFF_LINK1)
ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
ip6->ip6_flow &= ~htonl(0xff << 20);
ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
break;
}
#endif /* INET6 */
default:
ipstat.ips_nogif++;
m_freem(m);
return;
}
gif_input(m, af, gifp);
return;
}
/*
* 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(m, off, proto, arg)
const struct mbuf *m;
int off;
int proto;
void *arg;
{
struct ip ip;
struct gif_softc *sc;
struct sockaddr_in *src, *dst;
int addrmatch;
struct in_ifaddr *ia4;
/* sanity check done in caller */
sc = (struct gif_softc *)arg;
src = (struct sockaddr_in *)sc->gif_psrc;
dst = (struct sockaddr_in *)sc->gif_pdst;
/* LINTED const cast */
m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
/* check for address match */
addrmatch = 0;
if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
addrmatch |= 1;
if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
addrmatch |= 2;
else if ((sc->gif_if.if_flags & IFF_LINK0) != 0 &&
dst->sin_addr.s_addr == INADDR_ANY) {
addrmatch |= 2; /* we accept any source */
}
if (addrmatch != 3)
return 0;
/* martian filters on outer source - NOT done in ip_input! */
if (IN_MULTICAST(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 */
#if defined(__OpenBSD__) || defined(__NetBSD__)
for (ia4 = in_ifaddr.tqh_first; ia4; ia4 = ia4->ia_list.tqe_next)
#elif (defined(__FreeBSD__) && __FreeBSD__ >= 3)
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 ((m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
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)
return 0;
if (rt->rt_ifp != m->m_pkthdr.rcvif) {
rtfree(rt);
return 0;
}
rtfree(rt);
}
/* prioritize: IFF_LINK0 mode is less preferred */
return (sc->gif_if.if_flags & IFF_LINK0) ? 32 : 32 * 2;
}