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>"); | |
23 | MODULE_DESCRIPTION("iptables mac matching module"); | |
2e4e6a17 HW |
24 | MODULE_ALIAS("ipt_mac"); |
25 | MODULE_ALIAS("ip6t_mac"); | |
1da177e4 | 26 | |
1d93a9cb | 27 | static bool |
1da177e4 LT |
28 | match(const struct sk_buff *skb, |
29 | const struct net_device *in, | |
30 | const struct net_device *out, | |
c4986734 | 31 | const struct xt_match *match, |
1da177e4 LT |
32 | const void *matchinfo, |
33 | int offset, | |
2e4e6a17 | 34 | unsigned int protoff, |
cff533ac | 35 | bool *hotdrop) |
1da177e4 | 36 | { |
2e4e6a17 | 37 | const struct xt_mac_info *info = matchinfo; |
1da177e4 LT |
38 | |
39 | /* Is mac pointer valid? */ | |
7c4e36bc JE |
40 | return skb_mac_header(skb) >= skb->head && |
41 | skb_mac_header(skb) + ETH_HLEN <= skb->data | |
42 | /* If so, compare... */ | |
43 | && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr)) | |
44 | ^ info->invert); | |
1da177e4 LT |
45 | } |
46 | ||
9f15c530 | 47 | static struct xt_match xt_mac_match[] __read_mostly = { |
4470bbc7 PM |
48 | { |
49 | .name = "mac", | |
50 | .family = AF_INET, | |
51 | .match = match, | |
52 | .matchsize = sizeof(struct xt_mac_info), | |
6e23ae2a PM |
53 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
54 | (1 << NF_INET_LOCAL_IN) | | |
55 | (1 << NF_INET_FORWARD), | |
4470bbc7 PM |
56 | .me = THIS_MODULE, |
57 | }, | |
58 | { | |
59 | .name = "mac", | |
60 | .family = AF_INET6, | |
61 | .match = match, | |
62 | .matchsize = sizeof(struct xt_mac_info), | |
6e23ae2a PM |
63 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
64 | (1 << NF_INET_LOCAL_IN) | | |
65 | (1 << NF_INET_FORWARD), | |
4470bbc7 PM |
66 | .me = THIS_MODULE, |
67 | }, | |
1da177e4 LT |
68 | }; |
69 | ||
65b4b4e8 | 70 | static int __init xt_mac_init(void) |
1da177e4 | 71 | { |
4470bbc7 | 72 | return xt_register_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match)); |
1da177e4 LT |
73 | } |
74 | ||
65b4b4e8 | 75 | static void __exit xt_mac_fini(void) |
1da177e4 | 76 | { |
4470bbc7 | 77 | xt_unregister_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match)); |
1da177e4 LT |
78 | } |
79 | ||
65b4b4e8 AM |
80 | module_init(xt_mac_init); |
81 | module_exit(xt_mac_fini); |