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/* IP tables module for matching the routing realm
*
* (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
*
* 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/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <net/route.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/xt_realm.h>
#include <linux/netfilter/x_tables.h>
MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("X_tables realm match");
MODULE_ALIAS("ipt_realm");
static bool
match(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 xt_realm_info *info = matchinfo;
const struct dst_entry *dst = skb->dst;
return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
}
static struct xt_match realm_match __read_mostly = {
.name = "realm",
.match = match,
.matchsize = sizeof(struct xt_realm_info),
.hooks = (1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) |
(1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN),
.family = AF_INET,
.me = THIS_MODULE
};
static int __init xt_realm_init(void)
{
return xt_register_match(&realm_match);
}
static void __exit xt_realm_fini(void)
{
xt_unregister_match(&realm_match);
}
module_init(xt_realm_init);
module_exit(xt_realm_fini);
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