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Linux/net/netfilter/xt_mac.c

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  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 
 21 MODULE_LICENSE("GPL");
 22 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
 23 MODULE_DESCRIPTION("Xtables: MAC address match");
 24 MODULE_ALIAS("ipt_mac");
 25 MODULE_ALIAS("ip6t_mac");
 26 
 27 static bool mac_mt(const struct sk_buff *skb, const struct xt_match_param *par)
 28 {
 29     const struct xt_mac_info *info = par->matchinfo;
 30 
 31     /* Is mac pointer valid? */
 32     return skb_mac_header(skb) >= skb->head &&
 33            skb_mac_header(skb) + ETH_HLEN <= skb->data
 34            /* If so, compare... */
 35            && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
 36                 ^ info->invert);
 37 }
 38 
 39 static struct xt_match mac_mt_reg __read_mostly = {
 40         .name      = "mac",
 41         .revision  = 0,
 42         .family    = NFPROTO_UNSPEC,
 43         .match     = mac_mt,
 44         .matchsize = sizeof(struct xt_mac_info),
 45         .hooks     = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
 46                      (1 << NF_INET_FORWARD),
 47         .me        = THIS_MODULE,
 48 };
 49 
 50 static int __init mac_mt_init(void)
 51 {
 52         return xt_register_match(&mac_mt_reg);
 53 }
 54 
 55 static void __exit mac_mt_exit(void)
 56 {
 57         xt_unregister_match(&mac_mt_reg);
 58 }
 59 
 60 module_init(mac_mt_init);
 61 module_exit(mac_mt_exit);
 62 

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