1/* IP tables module for matching the routing realm
2 *
3 * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/module.h>
11#include <linux/skbuff.h>
12#include <linux/netdevice.h>
13#include <net/route.h>
14
15#include <linux/netfilter_ipv4.h>
16#include <linux/netfilter/xt_realm.h>
17#include <linux/netfilter/x_tables.h>
18
19MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
20MODULE_LICENSE("GPL");
21MODULE_DESCRIPTION("Xtables: Routing realm match");
22MODULE_ALIAS("ipt_realm");
23
24static bool
25realm_mt(const struct sk_buff *skb, struct xt_action_param *par)
26{
27	const struct xt_realm_info *info = par->matchinfo;
28	const struct dst_entry *dst = skb_dst(skb);
29
30	return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
31}
32
33static struct xt_match realm_mt_reg __read_mostly = {
34	.name		= "realm",
35	.match		= realm_mt,
36	.matchsize	= sizeof(struct xt_realm_info),
37	.hooks		= (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_FORWARD) |
38			  (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN),
39	.family		= NFPROTO_UNSPEC,
40	.me		= THIS_MODULE
41};
42
43static int __init realm_mt_init(void)
44{
45	return xt_register_match(&realm_mt_reg);
46}
47
48static void __exit realm_mt_exit(void)
49{
50	xt_unregister_match(&realm_mt_reg);
51}
52
53module_init(realm_mt_init);
54module_exit(realm_mt_exit);
55