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_ipv6.h> 18#include <linux/netfilter/xt_mac.h> 19#include <linux/netfilter/x_tables.h> 20 21MODULE_LICENSE("GPL"); 22MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); 23MODULE_DESCRIPTION("iptables mac matching module"); 24MODULE_ALIAS("ipt_mac"); 25MODULE_ALIAS("ip6t_mac"); 26 27static int 28match(const struct sk_buff *skb, 29 const struct net_device *in, 30 const struct net_device *out, 31 const struct xt_match *match, 32 const void *matchinfo, 33 int offset, 34 unsigned int protoff, 35 int *hotdrop) 36{ 37 const struct xt_mac_info *info = matchinfo; 38 39 /* Is mac pointer valid? */ 40 return (skb_mac_header(skb) >= skb->head && 41 (skb_mac_header(skb) + ETH_HLEN) <= skb->data 42 /* If so, compare... */ 43 && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr)) 44 ^ info->invert)); 45} 46 47static struct xt_match xt_mac_match[] = { 48 { 49 .name = "mac", 50 .family = AF_INET, 51 .match = match, 52 .matchsize = sizeof(struct xt_mac_info), 53 .hooks = (1 << NF_IP_PRE_ROUTING) | 54 (1 << NF_IP_LOCAL_IN) | 55 (1 << NF_IP_FORWARD), 56 .me = THIS_MODULE, 57 }, 58 { 59 .name = "mac", 60 .family = AF_INET6, 61 .match = match, 62 .matchsize = sizeof(struct xt_mac_info), 63 .hooks = (1 << NF_IP6_PRE_ROUTING) | 64 (1 << NF_IP6_LOCAL_IN) | 65 (1 << NF_IP6_FORWARD), 66 .me = THIS_MODULE, 67 }, 68}; 69 70static int __init xt_mac_init(void) 71{ 72 return xt_register_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match)); 73} 74 75static void __exit xt_mac_fini(void) 76{ 77 xt_unregister_matches(xt_mac_match, ARRAY_SIZE(xt_mac_match)); 78} 79 80module_init(xt_mac_init); 81module_exit(xt_mac_fini); 82