Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jan Engelhardt | e5042a2 | 2010-03-16 21:44:44 +0100 | [diff] [blame] | 13 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/if_ether.h> |
Kris Katterjohn | d3f4a68 | 2006-01-09 16:01:43 -0800 | [diff] [blame] | 15 | #include <linux/etherdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 17 | #include <linux/netfilter_ipv4.h> |
Patrick McHardy | 891350c | 2007-02-12 11:14:43 -0800 | [diff] [blame] | 18 | #include <linux/netfilter_ipv6.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 19 | #include <linux/netfilter/xt_mac.h> |
| 20 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | MODULE_LICENSE("GPL"); |
| 23 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 24 | MODULE_DESCRIPTION("Xtables: MAC address match"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 25 | MODULE_ALIAS("ipt_mac"); |
| 26 | MODULE_ALIAS("ip6t_mac"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 28 | static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
Jan Engelhardt | 1d1c397 | 2010-03-16 21:09:04 +0100 | [diff] [blame] | 30 | const struct xt_mac_info *info = par->matchinfo; |
| 31 | bool ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Jan Engelhardt | e5042a2 | 2010-03-16 21:44:44 +0100 | [diff] [blame] | 33 | if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER) |
| 34 | return false; |
Jan Engelhardt | 1d1c397 | 2010-03-16 21:09:04 +0100 | [diff] [blame] | 35 | if (skb_mac_header(skb) < skb->head) |
| 36 | return false; |
| 37 | if (skb_mac_header(skb) + ETH_HLEN > skb->data) |
| 38 | return false; |
| 39 | ret = compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr) == 0; |
| 40 | ret ^= info->invert; |
| 41 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | } |
| 43 | |
Jan Engelhardt | ab4f21e | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 44 | static struct xt_match mac_mt_reg __read_mostly = { |
| 45 | .name = "mac", |
| 46 | .revision = 0, |
| 47 | .family = NFPROTO_UNSPEC, |
| 48 | .match = mac_mt, |
| 49 | .matchsize = sizeof(struct xt_mac_info), |
| 50 | .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | |
| 51 | (1 << NF_INET_FORWARD), |
| 52 | .me = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | }; |
| 54 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 55 | static int __init mac_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
Jan Engelhardt | ab4f21e | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 57 | return xt_register_match(&mac_mt_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 60 | static void __exit mac_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
Jan Engelhardt | ab4f21e | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 62 | xt_unregister_match(&mac_mt_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 65 | module_init(mac_mt_init); |
| 66 | module_exit(mac_mt_exit); |