tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
14#include <linux/etherdevice.h>
15
16#include <linux/netfilter_ipv4.h>
17#include <linux/netfilter_ipv6.h>
18#include <linux/netfilter/xt_mac.h>
19#include <linux/netfilter/x_tables.h>
20
21MODULE_LICENSE("GPL");
22MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
23MODULE_DESCRIPTION("Xtables: MAC address match");
24MODULE_ALIAS("ipt_mac");
25MODULE_ALIAS("ip6t_mac");
26
27static bool
28mac_mt(const struct sk_buff *skb, const struct net_device *in,
29 const struct net_device *out, const struct xt_match *match,
30 const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop)
31{
32 const struct xt_mac_info *info = matchinfo;
33
34 /* Is mac pointer valid? */
35 return skb_mac_header(skb) >= skb->head &&
36 skb_mac_header(skb) + ETH_HLEN <= skb->data
37 /* If so, compare... */
38 && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
39 ^ info->invert);
40}
41
42static struct xt_match mac_mt_reg[] __read_mostly = {
43 {
44 .name = "mac",
45 .family = AF_INET,
46 .match = mac_mt,
47 .matchsize = sizeof(struct xt_mac_info),
48 .hooks = (1 << NF_INET_PRE_ROUTING) |
49 (1 << NF_INET_LOCAL_IN) |
50 (1 << NF_INET_FORWARD),
51 .me = THIS_MODULE,
52 },
53 {
54 .name = "mac",
55 .family = AF_INET6,
56 .match = mac_mt,
57 .matchsize = sizeof(struct xt_mac_info),
58 .hooks = (1 << NF_INET_PRE_ROUTING) |
59 (1 << NF_INET_LOCAL_IN) |
60 (1 << NF_INET_FORWARD),
61 .me = THIS_MODULE,
62 },
63};
64
65static int __init mac_mt_init(void)
66{
67 return xt_register_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
68}
69
70static void __exit mac_mt_exit(void)
71{
72 xt_unregister_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
73}
74
75module_init(mac_mt_init);
76module_exit(mac_mt_exit);