1 /* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
2 *
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.
6 */
7
8 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/if_ether.h>
11 #include <linux/if_packet.h>
12 #include <linux/in.h>
13 #include <linux/ip.h>
14 #include <linux/ipv6.h>
15
16 #include <linux/netfilter/xt_pkttype.h>
17 #include <linux/netfilter/x_tables.h>
18
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");
24
25 static bool
26 pkttype_mt(const struct sk_buff *skb, struct xt_action_param *par)
27 {
28 const struct xt_pkttype_info *info = par->matchinfo;
29 u_int8_t type;
30
31 if (skb->pkt_type != PACKET_LOOPBACK)
32 type = skb->pkt_type;
33 else if (xt_family(par) == NFPROTO_IPV4 &&
34 ipv4_is_multicast(ip_hdr(skb)->daddr))
35 type = PACKET_MULTICAST;
36 else if (xt_family(par) == NFPROTO_IPV6)
37 type = PACKET_MULTICAST;
38 else
39 type = PACKET_BROADCAST;
40
41 return (type == info->pkttype) ^ info->invert;
42 }
43
44 static struct xt_match pkttype_mt_reg __read_mostly = {
45 .name = "pkttype",
46 .revision = 0,
47 .family = NFPROTO_UNSPEC,
48 .match = pkttype_mt,
49 .matchsize = sizeof(struct xt_pkttype_info),
50 .me = THIS_MODULE,
51 };
52
53 static int __init pkttype_mt_init(void)
54 {
55 return xt_register_match(&pkttype_mt_reg);
56 }
57
58 static void __exit pkttype_mt_exit(void)
59 {
60 xt_unregister_match(&pkttype_mt_reg);
61 }
62
63 module_init(pkttype_mt_init);
64 module_exit(pkttype_mt_exit);
65
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