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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> | |
12 | ||
2e4e6a17 HW |
13 | #include <linux/netfilter/xt_pkttype.h> |
14 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
15 | |
16 | MODULE_LICENSE("GPL"); | |
17 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | |
18 | MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); | |
2e4e6a17 HW |
19 | MODULE_ALIAS("ipt_pkttype"); |
20 | MODULE_ALIAS("ip6t_pkttype"); | |
1da177e4 LT |
21 | |
22 | static int match(const struct sk_buff *skb, | |
23 | const struct net_device *in, | |
24 | const struct net_device *out, | |
c4986734 | 25 | const struct xt_match *match, |
1da177e4 LT |
26 | const void *matchinfo, |
27 | int offset, | |
2e4e6a17 | 28 | unsigned int protoff, |
1da177e4 LT |
29 | int *hotdrop) |
30 | { | |
2e4e6a17 | 31 | const struct xt_pkttype_info *info = matchinfo; |
1da177e4 | 32 | |
2e4e6a17 | 33 | return (skb->pkt_type == info->pkttype) ^ info->invert; |
1da177e4 LT |
34 | } |
35 | ||
2e4e6a17 | 36 | static struct xt_match pkttype_match = { |
1da177e4 | 37 | .name = "pkttype", |
5d04bff0 PM |
38 | .match = match, |
39 | .matchsize = sizeof(struct xt_pkttype_info), | |
a45049c5 | 40 | .family = AF_INET, |
1da177e4 LT |
41 | .me = THIS_MODULE, |
42 | }; | |
5d04bff0 | 43 | |
2e4e6a17 HW |
44 | static struct xt_match pkttype6_match = { |
45 | .name = "pkttype", | |
5d04bff0 PM |
46 | .match = match, |
47 | .matchsize = sizeof(struct xt_pkttype_info), | |
a45049c5 | 48 | .family = AF_INET6, |
2e4e6a17 HW |
49 | .me = THIS_MODULE, |
50 | }; | |
51 | ||
65b4b4e8 | 52 | static int __init xt_pkttype_init(void) |
1da177e4 | 53 | { |
2e4e6a17 | 54 | int ret; |
a45049c5 | 55 | ret = xt_register_match(&pkttype_match); |
2e4e6a17 HW |
56 | if (ret) |
57 | return ret; | |
58 | ||
a45049c5 | 59 | ret = xt_register_match(&pkttype6_match); |
2e4e6a17 | 60 | if (ret) |
a45049c5 | 61 | xt_unregister_match(&pkttype_match); |
2e4e6a17 HW |
62 | |
63 | return ret; | |
1da177e4 LT |
64 | } |
65 | ||
65b4b4e8 | 66 | static void __exit xt_pkttype_fini(void) |
1da177e4 | 67 | { |
a45049c5 PNA |
68 | xt_unregister_match(&pkttype_match); |
69 | xt_unregister_match(&pkttype6_match); | |
1da177e4 LT |
70 | } |
71 | ||
65b4b4e8 AM |
72 | module_init(xt_pkttype_init); |
73 | module_exit(xt_pkttype_fini); |