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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 HW |
16 | #include <linux/netfilter_ipv4.h> |
17 | #include <linux/netfilter/xt_mac.h> | |
18 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
19 | |
20 | MODULE_LICENSE("GPL"); | |
21 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
22 | MODULE_DESCRIPTION("iptables mac matching module"); | |
2e4e6a17 HW |
23 | MODULE_ALIAS("ipt_mac"); |
24 | MODULE_ALIAS("ip6t_mac"); | |
1da177e4 LT |
25 | |
26 | static int | |
27 | match(const struct sk_buff *skb, | |
28 | const struct net_device *in, | |
29 | const struct net_device *out, | |
c4986734 | 30 | const struct xt_match *match, |
1da177e4 LT |
31 | const void *matchinfo, |
32 | int offset, | |
2e4e6a17 | 33 | unsigned int protoff, |
1da177e4 LT |
34 | int *hotdrop) |
35 | { | |
2e4e6a17 | 36 | const struct xt_mac_info *info = matchinfo; |
1da177e4 LT |
37 | |
38 | /* Is mac pointer valid? */ | |
39 | return (skb->mac.raw >= skb->head | |
40 | && (skb->mac.raw + ETH_HLEN) <= skb->data | |
41 | /* If so, compare... */ | |
d3f4a687 KK |
42 | && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr)) |
43 | ^ info->invert)); | |
1da177e4 LT |
44 | } |
45 | ||
2e4e6a17 HW |
46 | static struct xt_match mac_match = { |
47 | .name = "mac", | |
5d04bff0 PM |
48 | .match = match, |
49 | .matchsize = sizeof(struct xt_mac_info), | |
50 | .hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | | |
51 | (1 << NF_IP_FORWARD), | |
a45049c5 | 52 | .family = AF_INET, |
2e4e6a17 HW |
53 | .me = THIS_MODULE, |
54 | }; | |
55 | static struct xt_match mac6_match = { | |
1da177e4 | 56 | .name = "mac", |
5d04bff0 PM |
57 | .match = match, |
58 | .matchsize = sizeof(struct xt_mac_info), | |
59 | .hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN) | | |
60 | (1 << NF_IP_FORWARD), | |
a45049c5 | 61 | .family = AF_INET6, |
1da177e4 LT |
62 | .me = THIS_MODULE, |
63 | }; | |
64 | ||
65b4b4e8 | 65 | static int __init xt_mac_init(void) |
1da177e4 | 66 | { |
2e4e6a17 | 67 | int ret; |
a45049c5 | 68 | ret = xt_register_match(&mac_match); |
2e4e6a17 HW |
69 | if (ret) |
70 | return ret; | |
71 | ||
a45049c5 | 72 | ret = xt_register_match(&mac6_match); |
2e4e6a17 | 73 | if (ret) |
a45049c5 | 74 | xt_unregister_match(&mac_match); |
2e4e6a17 HW |
75 | |
76 | return ret; | |
1da177e4 LT |
77 | } |
78 | ||
65b4b4e8 | 79 | static void __exit xt_mac_fini(void) |
1da177e4 | 80 | { |
a45049c5 PNA |
81 | xt_unregister_match(&mac_match); |
82 | xt_unregister_match(&mac6_match); | |
1da177e4 LT |
83 | } |
84 | ||
65b4b4e8 AM |
85 | module_init(xt_mac_init); |
86 | module_exit(xt_mac_fini); |