101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
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/* Kernel module to match MAC address parameters. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/if_ether.h>
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#include <linux/etherdevice.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter/xt_mac.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("iptables mac matching module");
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MODULE_ALIAS("ipt_mac");
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MODULE_ALIAS("ip6t_mac");
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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const struct xt_mac_info *info = matchinfo;
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/* Is mac pointer valid? */
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return (skb->mac.raw >= skb->head
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&& (skb->mac.raw + ETH_HLEN) <= skb->data
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/* If so, compare... */
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&& ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
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^ info->invert));
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}
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static int
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ipt_mac_checkentry(const char *tablename,
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const void *inf,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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/* FORWARD isn't always valid, but it's nice to be able to do --RR */
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if (hook_mask
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& ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)
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| (1 << NF_IP_FORWARD))) {
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printk("xt_mac: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
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return 0;
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}
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if (matchsize != XT_ALIGN(sizeof(struct xt_mac_info)))
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return 0;
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return 1;
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}
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static struct xt_match mac_match = {
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.name = "mac",
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.match = &match,
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.checkentry = &ipt_mac_checkentry,
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.me = THIS_MODULE,
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};
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static struct xt_match mac6_match = {
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.name = "mac",
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.match = &match,
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.checkentry = &ipt_mac_checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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int ret;
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ret = xt_register_match(AF_INET, &mac_match);
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if (ret)
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return ret;
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ret = xt_register_match(AF_INET6, &mac6_match);
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if (ret)
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xt_unregister_match(AF_INET, &mac_match);
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return ret;
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}
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static void __exit fini(void)
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{
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xt_unregister_match(AF_INET, &mac_match);
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xt_unregister_match(AF_INET6, &mac6_match);
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}
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module_init(init);
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module_exit(fini);
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