2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* iptables module to match inet_addr_type() of an ip.
|
|
|
|
*
|
|
|
|
* Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
|
2007-12-05 08:30:18 +01:00
|
|
|
* (C) 2007 Laszlo Attila Toth <panther@balabit.hu>
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <linux/netdevice.h>
|
|
|
|
#include <linux/ip.h>
|
|
|
|
#include <net/route.h>
|
|
|
|
|
|
|
|
#include <linux/netfilter_ipv4/ipt_addrtype.h>
|
2007-02-08 00:11:19 +01:00
|
|
|
#include <linux/netfilter/x_tables.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
2008-01-15 08:42:28 +01:00
|
|
|
MODULE_DESCRIPTION("Xtables: address type match for IPv4");
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-12-05 08:30:18 +01:00
|
|
|
static inline bool match_type(const struct net_device *dev, __be32 addr,
|
|
|
|
u_int16_t mask)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2008-01-10 12:25:28 +01:00
|
|
|
return !!(mask & (1 << inet_dev_addr_type(&init_net, dev, addr)));
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2007-12-05 08:24:03 +01:00
|
|
|
static bool
|
2007-12-05 08:30:18 +01:00
|
|
|
addrtype_mt_v0(const struct sk_buff *skb, const struct net_device *in,
|
|
|
|
const struct net_device *out, const struct xt_match *match,
|
|
|
|
const void *matchinfo, int offset, unsigned int protoff,
|
|
|
|
bool *hotdrop)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
const struct ipt_addrtype_info *info = matchinfo;
|
2007-04-21 07:47:35 +02:00
|
|
|
const struct iphdr *iph = ip_hdr(skb);
|
2007-07-08 07:15:35 +02:00
|
|
|
bool ret = true;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
if (info->source)
|
2007-12-05 08:30:18 +01:00
|
|
|
ret &= match_type(NULL, iph->saddr, info->source) ^
|
|
|
|
info->invert_source;
|
2005-04-17 00:20:36 +02:00
|
|
|
if (info->dest)
|
2007-12-05 08:30:18 +01:00
|
|
|
ret &= match_type(NULL, iph->daddr, info->dest) ^
|
|
|
|
info->invert_dest;
|
2007-02-09 15:24:47 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2007-12-05 08:30:18 +01:00
|
|
|
static bool
|
|
|
|
addrtype_mt_v1(const struct sk_buff *skb, const struct net_device *in,
|
|
|
|
const struct net_device *out, const struct xt_match *match,
|
|
|
|
const void *matchinfo, int offset, unsigned int protoff,
|
|
|
|
bool *hotdrop)
|
|
|
|
{
|
|
|
|
const struct ipt_addrtype_info_v1 *info = matchinfo;
|
|
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
|
|
const struct net_device *dev = NULL;
|
|
|
|
bool ret = true;
|
|
|
|
|
|
|
|
if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN)
|
|
|
|
dev = in;
|
|
|
|
else if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT)
|
|
|
|
dev = out;
|
|
|
|
|
|
|
|
if (info->source)
|
|
|
|
ret &= match_type(dev, iph->saddr, info->source) ^
|
|
|
|
(info->flags & IPT_ADDRTYPE_INVERT_SOURCE);
|
|
|
|
if (ret && info->dest)
|
|
|
|
ret &= match_type(dev, iph->daddr, info->dest) ^
|
|
|
|
(info->flags & IPT_ADDRTYPE_INVERT_DEST);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
addrtype_mt_checkentry_v1(const char *tablename, const void *ip_void,
|
|
|
|
const struct xt_match *match, void *matchinfo,
|
|
|
|
unsigned int hook_mask)
|
|
|
|
{
|
|
|
|
struct ipt_addrtype_info_v1 *info = matchinfo;
|
|
|
|
|
|
|
|
if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN &&
|
|
|
|
info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
|
|
|
|
printk(KERN_ERR "ipt_addrtype: both incoming and outgoing "
|
|
|
|
"interface limitation cannot be selected\n");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hook_mask & (1 << NF_INET_PRE_ROUTING | 1 << NF_INET_LOCAL_IN) &&
|
|
|
|
info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
|
|
|
|
printk(KERN_ERR "ipt_addrtype: output interface limitation "
|
|
|
|
"not valid in PRE_ROUTING and INPUT\n");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hook_mask & (1 << NF_INET_POST_ROUTING | 1 << NF_INET_LOCAL_OUT) &&
|
|
|
|
info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) {
|
|
|
|
printk(KERN_ERR "ipt_addrtype: input interface limitation "
|
|
|
|
"not valid in POST_ROUTING and OUTPUT\n");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct xt_match addrtype_mt_reg[] __read_mostly = {
|
|
|
|
{
|
|
|
|
.name = "addrtype",
|
|
|
|
.family = AF_INET,
|
|
|
|
.match = addrtype_mt_v0,
|
|
|
|
.matchsize = sizeof(struct ipt_addrtype_info),
|
|
|
|
.me = THIS_MODULE
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.name = "addrtype",
|
|
|
|
.family = AF_INET,
|
|
|
|
.revision = 1,
|
|
|
|
.match = addrtype_mt_v1,
|
|
|
|
.checkentry = addrtype_mt_checkentry_v1,
|
|
|
|
.matchsize = sizeof(struct ipt_addrtype_info_v1),
|
|
|
|
.me = THIS_MODULE
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
};
|
|
|
|
|
2007-12-05 08:24:03 +01:00
|
|
|
static int __init addrtype_mt_init(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-12-05 08:30:18 +01:00
|
|
|
return xt_register_matches(addrtype_mt_reg,
|
|
|
|
ARRAY_SIZE(addrtype_mt_reg));
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2007-12-05 08:24:03 +01:00
|
|
|
static void __exit addrtype_mt_exit(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-12-05 08:30:18 +01:00
|
|
|
xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg));
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2007-12-05 08:24:03 +01:00
|
|
|
module_init(addrtype_mt_init);
|
|
|
|
module_exit(addrtype_mt_exit);
|