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>
14 #include <linux/ipv6.h>
16 #include <linux/netfilter/xt_pkttype.h>
17 #include <linux/netfilter/x_tables.h>
19 MODULE_LICENSE("GPL");
20 MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
21 MODULE_DESCRIPTION("Xtables: link layer packet type match");
22 MODULE_ALIAS("ipt_pkttype");
23 MODULE_ALIAS("ip6t_pkttype");
26 pkttype_mt(const struct sk_buff *skb, const struct net_device *in,
27 const struct net_device *out, const struct xt_match *match,
28 const void *matchinfo, int offset, unsigned int protoff,
31 const struct xt_pkttype_info *info = matchinfo;
34 if (skb->pkt_type != PACKET_LOOPBACK)
36 else if (match->family == AF_INET &&
37 ipv4_is_multicast(ip_hdr(skb)->daddr))
38 type = PACKET_MULTICAST;
39 else if (match->family == AF_INET6 &&
40 ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
41 type = PACKET_MULTICAST;
43 type = PACKET_BROADCAST;
45 return (type == info->pkttype) ^ info->invert;
48 static struct xt_match pkttype_mt_reg[] __read_mostly = {
53 .matchsize = sizeof(struct xt_pkttype_info),
60 .matchsize = sizeof(struct xt_pkttype_info),
65 static int __init pkttype_mt_init(void)
67 return xt_register_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg));
70 static void __exit pkttype_mt_exit(void)
72 xt_unregister_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg));
75 module_init(pkttype_mt_init);
76 module_exit(pkttype_mt_exit);