/* 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("Xtables: MAC address match"); MODULE_ALIAS("ipt_mac"); MODULE_ALIAS("ip6t_mac"); static bool mac_mt(const struct sk_buff *skb, const struct xt_match_param *par) { const struct xt_mac_info *info = par->matchinfo; /* Is mac pointer valid? */ return skb_mac_header(skb) >= skb->head && skb_mac_header(skb) + ETH_HLEN <= skb->data /* If so, compare... */ && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr)) ^ info->invert); } static struct xt_match mac_mt_reg __read_mostly = { .name = "mac", .revision = 0, .family = NFPROTO_UNSPEC, .match = mac_mt, .matchsize = sizeof(struct xt_mac_info), .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD), .me = THIS_MODULE, }; static int __init mac_mt_init(void) { return xt_register_match(&mac_mt_reg); } static void __exit mac_mt_exit(void) { xt_unregister_match(&mac_mt_reg); } module_init(mac_mt_init); module_exit(mac_mt_exit);