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> |
| 13 | #include <linux/if_ether.h> |
Kris Katterjohn | d3f4a68 | 2006-01-09 16:01:43 -0800 | [diff] [blame] | 14 | #include <linux/etherdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 16 | #include <linux/netfilter_ipv4.h> |
Patrick McHardy | 891350c | 2007-02-12 11:14:43 -0800 | [diff] [blame] | 17 | #include <linux/netfilter_ipv6.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 18 | #include <linux/netfilter/xt_mac.h> |
| 19 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | MODULE_LICENSE("GPL"); |
| 22 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); |
| 23 | MODULE_DESCRIPTION("iptables mac matching module"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 24 | MODULE_ALIAS("ipt_mac"); |
| 25 | MODULE_ALIAS("ip6t_mac"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 27 | static bool |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 28 | mac_mt(const struct sk_buff *skb, const struct net_device *in, |
| 29 | const struct net_device *out, const struct xt_match *match, |
| 30 | const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 32 | const struct xt_mac_info *info = matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | /* Is mac pointer valid? */ |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 35 | return skb_mac_header(skb) >= skb->head && |
| 36 | skb_mac_header(skb) + ETH_HLEN <= skb->data |
| 37 | /* If so, compare... */ |
| 38 | && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr)) |
| 39 | ^ info->invert); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | } |
| 41 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 42 | static struct xt_match mac_mt_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 43 | { |
| 44 | .name = "mac", |
| 45 | .family = AF_INET, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 46 | .match = mac_mt, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 47 | .matchsize = sizeof(struct xt_mac_info), |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 48 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 49 | (1 << NF_INET_LOCAL_IN) | |
| 50 | (1 << NF_INET_FORWARD), |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 51 | .me = THIS_MODULE, |
| 52 | }, |
| 53 | { |
| 54 | .name = "mac", |
| 55 | .family = AF_INET6, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 56 | .match = mac_mt, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 57 | .matchsize = sizeof(struct xt_mac_info), |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 58 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 59 | (1 << NF_INET_LOCAL_IN) | |
| 60 | (1 << NF_INET_FORWARD), |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 61 | .me = THIS_MODULE, |
| 62 | }, |
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 | static int __init mac_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 67 | return xt_register_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 70 | static void __exit mac_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 72 | xt_unregister_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | } |
| 74 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame^] | 75 | module_init(mac_mt_init); |
| 76 | module_exit(mac_mt_exit); |