Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Kernel module to match MAC address parameters. */ |
3 | ||
4 | /* (C) 1999-2001 Paul `Rusty' Russell | |
5 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/skbuff.h> | |
e5042a29 | 10 | #include <linux/if_arp.h> |
1da177e4 | 11 | #include <linux/if_ether.h> |
d3f4a687 | 12 | #include <linux/etherdevice.h> |
1da177e4 | 13 | |
2e4e6a17 | 14 | #include <linux/netfilter_ipv4.h> |
891350c9 | 15 | #include <linux/netfilter_ipv6.h> |
2e4e6a17 HW |
16 | #include <linux/netfilter/xt_mac.h> |
17 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
18 | |
19 | MODULE_LICENSE("GPL"); | |
20 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
2ae15b64 | 21 | MODULE_DESCRIPTION("Xtables: MAC address match"); |
2e4e6a17 HW |
22 | MODULE_ALIAS("ipt_mac"); |
23 | MODULE_ALIAS("ip6t_mac"); | |
1da177e4 | 24 | |
62fc8051 | 25 | static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 26 | { |
1d1c397d JE |
27 | const struct xt_mac_info *info = par->matchinfo; |
28 | bool ret; | |
29 | ||
e5042a29 JE |
30 | if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER) |
31 | return false; | |
1d1c397d JE |
32 | if (skb_mac_header(skb) < skb->head) |
33 | return false; | |
34 | if (skb_mac_header(skb) + ETH_HLEN > skb->data) | |
35 | return false; | |
8561cf99 | 36 | ret = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr); |
1d1c397d JE |
37 | ret ^= info->invert; |
38 | return ret; | |
1da177e4 LT |
39 | } |
40 | ||
ab4f21e6 JE |
41 | static struct xt_match mac_mt_reg __read_mostly = { |
42 | .name = "mac", | |
43 | .revision = 0, | |
44 | .family = NFPROTO_UNSPEC, | |
45 | .match = mac_mt, | |
46 | .matchsize = sizeof(struct xt_mac_info), | |
47 | .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | | |
48 | (1 << NF_INET_FORWARD), | |
49 | .me = THIS_MODULE, | |
1da177e4 LT |
50 | }; |
51 | ||
d3c5ee6d | 52 | static int __init mac_mt_init(void) |
1da177e4 | 53 | { |
ab4f21e6 | 54 | return xt_register_match(&mac_mt_reg); |
1da177e4 LT |
55 | } |
56 | ||
d3c5ee6d | 57 | static void __exit mac_mt_exit(void) |
1da177e4 | 58 | { |
ab4f21e6 | 59 | xt_unregister_match(&mac_mt_reg); |
1da177e4 LT |
60 | } |
61 | ||
d3c5ee6d JE |
62 | module_init(mac_mt_init); |
63 | module_exit(mac_mt_exit); |