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");
25 pkttype_mt(const struct sk_buff *skb, const struct net_device *in,
26 const struct net_device *out, const struct xt_match *match,
27 const void *matchinfo, int offset, unsigned int protoff,
31 const struct xt_pkttype_info *info = matchinfo;
33 if (skb->pkt_type == PACKET_LOOPBACK)
34 type = match->family == AF_INET &&
35 ipv4_is_multicast(ip_hdr(skb)->daddr)
41 return (type == info->pkttype) ^ info->invert;
44 static struct xt_match pkttype_mt_reg[] __read_mostly = {
49 .matchsize = sizeof(struct xt_pkttype_info),
56 .matchsize = sizeof(struct xt_pkttype_info),
61 static int __init pkttype_mt_init(void)
63 return xt_register_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg));
66 static void __exit pkttype_mt_exit(void)
68 xt_unregister_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg));
71 module_init(pkttype_mt_init);
72 module_exit(pkttype_mt_exit);