Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
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>
6 */
7
8#include <linux/module.h>
9#include <linux/skbuff.h>
10#include <linux/if_arp.h>
11#include <linux/if_ether.h>
12#include <linux/etherdevice.h>
13
14#include <linux/netfilter_ipv4.h>
15#include <linux/netfilter_ipv6.h>
16#include <linux/netfilter/xt_mac.h>
17#include <linux/netfilter/x_tables.h>
18
19MODULE_LICENSE("GPL");
20MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
21MODULE_DESCRIPTION("Xtables: MAC address match");
22MODULE_ALIAS("ipt_mac");
23MODULE_ALIAS("ip6t_mac");
24
25static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par)
26{
27 const struct xt_mac_info *info = par->matchinfo;
28 bool ret;
29
30 if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER)
31 return false;
32 if (!skb_mac_header_was_set(skb) || skb_mac_header_len(skb) < ETH_HLEN)
33 return false;
34 ret = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr);
35 ret ^= info->invert;
36 return ret;
37}
38
39static struct xt_match mac_mt_reg[] __read_mostly = {
40 {
41 .name = "mac",
42 .family = NFPROTO_IPV4,
43 .match = mac_mt,
44 .matchsize = sizeof(struct xt_mac_info),
45 .hooks = (1 << NF_INET_PRE_ROUTING) |
46 (1 << NF_INET_LOCAL_IN) |
47 (1 << NF_INET_FORWARD),
48 .me = THIS_MODULE,
49 },
50 {
51 .name = "mac",
52 .family = NFPROTO_IPV6,
53 .match = mac_mt,
54 .matchsize = sizeof(struct xt_mac_info),
55 .hooks = (1 << NF_INET_PRE_ROUTING) |
56 (1 << NF_INET_LOCAL_IN) |
57 (1 << NF_INET_FORWARD),
58 .me = THIS_MODULE,
59 },
60};
61
62static int __init mac_mt_init(void)
63{
64 return xt_register_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
65}
66
67static void __exit mac_mt_exit(void)
68{
69 xt_unregister_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
70}
71
72module_init(mac_mt_init);
73module_exit(mac_mt_exit);