1 /* Kernel module to match MAC address parameters. */
3 /* (C) 1999-2001 Paul `Rusty' Russell
4 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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.
11 #include <linux/module.h>
12 #include <linux/skbuff.h>
13 #include <linux/if_ether.h>
14 #include <linux/etherdevice.h>
16 #include <linux/netfilter_ipv4/ipt_mac.h>
17 #include <linux/netfilter_ipv4/ip_tables.h>
19 MODULE_LICENSE("GPL");
20 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
21 MODULE_DESCRIPTION("iptables mac matching module");
24 match(const struct sk_buff *skb,
25 const struct net_device *in,
26 const struct net_device *out,
27 const void *matchinfo,
31 const struct ipt_mac_info *info = matchinfo;
33 /* Is mac pointer valid? */
34 return (skb->mac.raw >= skb->head
35 && (skb->mac.raw + ETH_HLEN) <= skb->data
36 /* If so, compare... */
37 && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
42 ipt_mac_checkentry(const char *tablename,
43 const struct ipt_ip *ip,
45 unsigned int matchsize,
46 unsigned int hook_mask)
48 /* FORWARD isn't always valid, but it's nice to be able to do --RR */
50 & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)
51 | (1 << NF_IP_FORWARD))) {
52 printk("ipt_mac: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
56 if (matchsize != IPT_ALIGN(sizeof(struct ipt_mac_info)))
62 static struct ipt_match mac_match = {
65 .checkentry = &ipt_mac_checkentry,
69 static int __init init(void)
71 return ipt_register_match(&mac_match);
74 static void __exit fini(void)
76 ipt_unregister_match(&mac_match);