1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  ebt_pkttype
4 *
5 *	Authors:
6 *	Bart De Schuymer <bdschuym@pandora.be>
7 *
8 *  April, 2003
9 *
10 */
11#include <linux/module.h>
12#include <linux/netfilter/x_tables.h>
13#include <linux/netfilter_bridge/ebtables.h>
14#include <linux/netfilter_bridge/ebt_pkttype.h>
15
16static bool
17ebt_pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
18{
19	const struct ebt_pkttype_info *info = par->matchinfo;
20
21	return (skb->pkt_type == info->pkt_type) ^ info->invert;
22}
23
24static int ebt_pkttype_mt_check(const struct xt_mtchk_param *par)
25{
26	const struct ebt_pkttype_info *info = par->matchinfo;
27
28	if (info->invert != 0 && info->invert != 1)
29		return -EINVAL;
30	/* Allow any pkt_type value */
31	return 0;
32}
33
34static struct xt_match ebt_pkttype_mt_reg __read_mostly = {
35	.name		= "pkttype",
36	.revision	= 0,
37	.family		= NFPROTO_BRIDGE,
38	.match		= ebt_pkttype_mt,
39	.checkentry	= ebt_pkttype_mt_check,
40	.matchsize	= sizeof(struct ebt_pkttype_info),
41	.me		= THIS_MODULE,
42};
43
44static int __init ebt_pkttype_init(void)
45{
46	return xt_register_match(&ebt_pkttype_mt_reg);
47}
48
49static void __exit ebt_pkttype_fini(void)
50{
51	xt_unregister_match(&ebt_pkttype_mt_reg);
52}
53
54module_init(ebt_pkttype_init);
55module_exit(ebt_pkttype_fini);
56MODULE_DESCRIPTION("Ebtables: Link layer packet type match");
57MODULE_LICENSE("GPL");
58