| /* 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/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_IP_PRE_ROUTING) | |
| (1 << NF_IP_LOCAL_IN) | |
| (1 << NF_IP_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); |