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/xt_mac.h>
18#include <linux/netfilter/x_tables.h>
19
20MODULE_LICENSE("GPL");
21MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
22MODULE_DESCRIPTION("iptables mac matching module");
23MODULE_ALIAS("ipt_mac");
24MODULE_ALIAS("ip6t_mac");
25
26static int
27match(const struct sk_buff *skb,
28 const struct net_device *in,
29 const struct net_device *out,
30 const struct xt_match *match,
31 const void *matchinfo,
32 int offset,
33 unsigned int protoff,
34 int *hotdrop)
35{
36 const struct xt_mac_info *info = matchinfo;
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... */
42 && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
43 ^ info->invert));
44}
45
46static struct xt_match mac_match = {
47 .name = "mac",
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),
52 .family = AF_INET,
53 .me = THIS_MODULE,
54};
55static struct xt_match mac6_match = {
56 .name = "mac",
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),
61 .family = AF_INET6,
62 .me = THIS_MODULE,
63};
64
65static int __init xt_mac_init(void)
66{
67 int ret;
68 ret = xt_register_match(&mac_match);
69 if (ret)
70 return ret;
71
72 ret = xt_register_match(&mac6_match);
73 if (ret)
74 xt_unregister_match(&mac_match);
75
76 return ret;
77}
78
79static void __exit xt_mac_fini(void)
80{
81 xt_unregister_match(&mac_match);
82 xt_unregister_match(&mac6_match);
83}
84
85module_init(xt_mac_init);
86module_exit(xt_mac_fini);