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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_arp.h>
 14 #include <linux/if_ether.h>
 15 #include <linux/etherdevice.h>
 16 
 17 #include <linux/netfilter_ipv4.h>
 18 #include <linux/netfilter_ipv6.h>
 19 #include <linux/netfilter/xt_mac.h>
 20 #include <linux/netfilter/x_tables.h>
 21 
 22 MODULE_LICENSE("GPL");
 23 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
 24 MODULE_DESCRIPTION("Xtables: MAC address match");
 25 MODULE_ALIAS("ipt_mac");
 26 MODULE_ALIAS("ip6t_mac");
 27 
 28 static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par)
 29 {
 30         const struct xt_mac_info *info = par->matchinfo;
 31         bool ret;
 32 
 33         if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER)
 34                 return false;
 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  = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr);
 40         ret ^= info->invert;
 41         return ret;
 42 }
 43 
 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,
 53 };
 54 
 55 static int __init mac_mt_init(void)
 56 {
 57         return xt_register_match(&mac_mt_reg);
 58 }
 59 
 60 static void __exit mac_mt_exit(void)
 61 {
 62         xt_unregister_match(&mac_mt_reg);
 63 }
 64 
 65 module_init(mac_mt_init);
 66 module_exit(mac_mt_exit);
 67 

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