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>
15 #include <linux/netfilter/xt_pkttype.h>
16 #include <linux/netfilter/x_tables.h>
18 MODULE_LICENSE("GPL");
19 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
20 MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");
21 MODULE_ALIAS("ipt_pkttype");
22 MODULE_ALIAS("ip6t_pkttype");
24 static int match(const struct sk_buff *skb,
25 const struct net_device *in,
26 const struct net_device *out,
27 const struct xt_match *match,
28 const void *matchinfo,
34 const struct xt_pkttype_info *info = matchinfo;
36 if (skb->pkt_type == PACKET_LOOPBACK)
37 type = (MULTICAST(skb->nh.iph->daddr)
43 return (type == info->pkttype) ^ info->invert;
46 static struct xt_match pkttype_match = {
49 .matchsize = sizeof(struct xt_pkttype_info),
54 static struct xt_match pkttype6_match = {
57 .matchsize = sizeof(struct xt_pkttype_info),
62 static int __init xt_pkttype_init(void)
65 ret = xt_register_match(&pkttype_match);
69 ret = xt_register_match(&pkttype6_match);
71 xt_unregister_match(&pkttype_match);
76 static void __exit xt_pkttype_fini(void)
78 xt_unregister_match(&pkttype_match);
79 xt_unregister_match(&pkttype6_match);
82 module_init(xt_pkttype_init);
83 module_exit(xt_pkttype_fini);