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1da177e4 LT |
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> | |
28658c89 PO |
12 | #include <linux/in.h> |
13 | #include <linux/ip.h> | |
1da177e4 | 14 | |
2e4e6a17 HW |
15 | #include <linux/netfilter/xt_pkttype.h> |
16 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
17 | |
18 | MODULE_LICENSE("GPL"); | |
19 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
20 | MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); | |
2e4e6a17 HW |
21 | MODULE_ALIAS("ipt_pkttype"); |
22 | MODULE_ALIAS("ip6t_pkttype"); | |
1da177e4 LT |
23 | |
24 | static int match(const struct sk_buff *skb, | |
25 | const struct net_device *in, | |
26 | const struct net_device *out, | |
c4986734 | 27 | const struct xt_match *match, |
1da177e4 LT |
28 | const void *matchinfo, |
29 | int offset, | |
2e4e6a17 | 30 | unsigned int protoff, |
1da177e4 LT |
31 | int *hotdrop) |
32 | { | |
28658c89 | 33 | u_int8_t type; |
2e4e6a17 | 34 | const struct xt_pkttype_info *info = matchinfo; |
1da177e4 | 35 | |
28658c89 PO |
36 | if (skb->pkt_type == PACKET_LOOPBACK) |
37 | type = (MULTICAST(skb->nh.iph->daddr) | |
38 | ? PACKET_MULTICAST | |
39 | : PACKET_BROADCAST); | |
40 | else | |
41 | type = skb->pkt_type; | |
42 | ||
43 | return (type == info->pkttype) ^ info->invert; | |
1da177e4 LT |
44 | } |
45 | ||
4470bbc7 PM |
46 | static struct xt_match xt_pkttype_match[] = { |
47 | { | |
48 | .name = "pkttype", | |
49 | .family = AF_INET, | |
50 | .match = match, | |
51 | .matchsize = sizeof(struct xt_pkttype_info), | |
52 | .me = THIS_MODULE, | |
53 | }, | |
54 | { | |
55 | .name = "pkttype", | |
56 | .family = AF_INET6, | |
57 | .match = match, | |
58 | .matchsize = sizeof(struct xt_pkttype_info), | |
59 | .me = THIS_MODULE, | |
60 | }, | |
2e4e6a17 HW |
61 | }; |
62 | ||
65b4b4e8 | 63 | static int __init xt_pkttype_init(void) |
1da177e4 | 64 | { |
4470bbc7 PM |
65 | return xt_register_matches(xt_pkttype_match, |
66 | ARRAY_SIZE(xt_pkttype_match)); | |
1da177e4 LT |
67 | } |
68 | ||
65b4b4e8 | 69 | static void __exit xt_pkttype_fini(void) |
1da177e4 | 70 | { |
4470bbc7 | 71 | xt_unregister_matches(xt_pkttype_match, ARRAY_SIZE(xt_pkttype_match)); |
1da177e4 LT |
72 | } |
73 | ||
65b4b4e8 AM |
74 | module_init(xt_pkttype_init); |
75 | module_exit(xt_pkttype_fini); |