Commit | Line | Data |
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1da177e4 LT |
1 | /* Kernel module to match MAC address parameters. */ |
2 | ||
3 | /* (C) 1999-2001 Paul `Rusty' Russell | |
4 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/if_ether.h> | |
d3f4a687 | 14 | #include <linux/etherdevice.h> |
1da177e4 | 15 | |
2e4e6a17 | 16 | #include <linux/netfilter_ipv4.h> |
891350c9 | 17 | #include <linux/netfilter_ipv6.h> |
2e4e6a17 HW |
18 | #include <linux/netfilter/xt_mac.h> |
19 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
20 | |
21 | MODULE_LICENSE("GPL"); | |
22 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
2ae15b64 | 23 | MODULE_DESCRIPTION("Xtables: MAC address match"); |
2e4e6a17 HW |
24 | MODULE_ALIAS("ipt_mac"); |
25 | MODULE_ALIAS("ip6t_mac"); | |
1da177e4 | 26 | |
f7108a20 | 27 | static bool mac_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 28 | { |
f7108a20 | 29 | const struct xt_mac_info *info = par->matchinfo; |
1da177e4 LT |
30 | |
31 | /* Is mac pointer valid? */ | |
7c4e36bc JE |
32 | return skb_mac_header(skb) >= skb->head && |
33 | skb_mac_header(skb) + ETH_HLEN <= skb->data | |
34 | /* If so, compare... */ | |
35 | && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr)) | |
36 | ^ info->invert); | |
1da177e4 LT |
37 | } |
38 | ||
ab4f21e6 JE |
39 | static struct xt_match mac_mt_reg __read_mostly = { |
40 | .name = "mac", | |
41 | .revision = 0, | |
42 | .family = NFPROTO_UNSPEC, | |
43 | .match = mac_mt, | |
44 | .matchsize = sizeof(struct xt_mac_info), | |
45 | .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | | |
46 | (1 << NF_INET_FORWARD), | |
47 | .me = THIS_MODULE, | |
1da177e4 LT |
48 | }; |
49 | ||
d3c5ee6d | 50 | static int __init mac_mt_init(void) |
1da177e4 | 51 | { |
ab4f21e6 | 52 | return xt_register_match(&mac_mt_reg); |
1da177e4 LT |
53 | } |
54 | ||
d3c5ee6d | 55 | static void __exit mac_mt_exit(void) |
1da177e4 | 56 | { |
ab4f21e6 | 57 | xt_unregister_match(&mac_mt_reg); |
1da177e4 LT |
58 | } |
59 | ||
d3c5ee6d JE |
60 | module_init(mac_mt_init); |
61 | module_exit(mac_mt_exit); |