1 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 as
5 * published by the Free Software Foundation.
8 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/if_ether.h>
11 #include <linux/if_packet.h>
13 #include <linux/netfilter/xt_pkttype.h>
14 #include <linux/netfilter/x_tables.h>
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
18 MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");
19 MODULE_ALIAS("ipt_pkttype");
20 MODULE_ALIAS("ip6t_pkttype");
22 static int match(const struct sk_buff *skb,
23 const struct net_device *in,
24 const struct net_device *out,
25 const void *matchinfo,
30 const struct xt_pkttype_info *info = matchinfo;
32 return (skb->pkt_type == info->pkttype) ^ info->invert;
35 static int checkentry(const char *tablename,
38 unsigned int matchsize,
39 unsigned int hook_mask)
41 if (matchsize != XT_ALIGN(sizeof(struct xt_pkttype_info)))
47 static struct xt_match pkttype_match = {
50 .checkentry = &checkentry,
53 static struct xt_match pkttype6_match = {
56 .checkentry = &checkentry,
61 static int __init init(void)
64 ret = xt_register_match(AF_INET, &pkttype_match);
68 ret = xt_register_match(AF_INET6, &pkttype6_match);
70 xt_unregister_match(AF_INET, &pkttype_match);
75 static void __exit fini(void)
77 xt_unregister_match(AF_INET, &pkttype_match);
78 xt_unregister_match(AF_INET6, &pkttype6_match);