1/*
2 *  ebt_pkttype
3 *
4 *	Authors:
5 *	Bart De Schuymer <bdschuym@pandora.be>
6 *
7 *  April, 2003
8 *
9 */
10#include <linux/module.h>
11#include <linux/netfilter/x_tables.h>
12#include <linux/netfilter_bridge/ebtables.h>
13#include <linux/netfilter_bridge/ebt_pkttype.h>
14
15static bool
16ebt_pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
17{
18	const struct ebt_pkttype_info *info = par->matchinfo;
19
20	return (skb->pkt_type == info->pkt_type) ^ info->invert;
21}
22
23static int ebt_pkttype_mt_check(const struct xt_mtchk_param *par)
24{
25	const struct ebt_pkttype_info *info = par->matchinfo;
26
27	if (info->invert != 0 && info->invert != 1)
28		return -EINVAL;
29	/* Allow any pkt_type value */
30	return 0;
31}
32
33static struct xt_match ebt_pkttype_mt_reg __read_mostly = {
34	.name		= "pkttype",
35	.revision	= 0,
36	.family		= NFPROTO_BRIDGE,
37	.match		= ebt_pkttype_mt,
38	.checkentry	= ebt_pkttype_mt_check,
39	.matchsize	= sizeof(struct ebt_pkttype_info),
40	.me		= THIS_MODULE,
41};
42
43static int __init ebt_pkttype_init(void)
44{
45	return xt_register_match(&ebt_pkttype_mt_reg);
46}
47
48static void __exit ebt_pkttype_fini(void)
49{
50	xt_unregister_match(&ebt_pkttype_mt_reg);
51}
52
53module_init(ebt_pkttype_init);
54module_exit(ebt_pkttype_fini);
55MODULE_DESCRIPTION("Ebtables: Link layer packet type match");
56MODULE_LICENSE("GPL");
57