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- /* Kernel module to match MAC address parameters. */
- /* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/if_ether.h>
- #include <linux/etherdevice.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/netfilter_ipv6.h>
- #include <linux/netfilter/xt_mac.h>
- #include <linux/netfilter/x_tables.h>
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
- MODULE_DESCRIPTION("iptables mac matching module");
- MODULE_ALIAS("ipt_mac");
- MODULE_ALIAS("ip6t_mac");
- static int
- match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
- {
- const struct xt_mac_info *info = matchinfo;
- /* Is mac pointer valid? */
- return (skb->mac.raw >= skb->head
- && (skb->mac.raw + ETH_HLEN) <= skb->data
- /* If so, compare... */
- && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
- ^ info->invert));
- }
- static struct xt_match xt_mac_match[] = {
- {
- .name = "mac",
- .family = AF_INET,
- .match = match,
- .matchsize = sizeof(struct xt_mac_info),
- .hooks = (1 << NF_IP_PRE_ROUTING) |
- (1 << NF_IP_LOCAL_IN) |
- (1 << NF_IP_FORWARD),
- .me = THIS_MODULE,
- },
- {
- .name = "mac",
- .family = AF_INET6,
- .match = match,
- .matchsize = sizeof(struct xt_mac_info),
- .hooks = (1 << NF_IP6_PRE_ROUTING) |
- (1 << NF_IP6_LOCAL_IN) |
- (1 << NF_IP6_FORWARD),
- .me = THIS_MODULE,
- },
- };
- static int __init xt_mac_init(void)
- {
- return xt_register_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match));
- }
- static void __exit xt_mac_fini(void)
- {
- xt_unregister_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match));
- }
- module_init(xt_mac_init);
- module_exit(xt_mac_fini);
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