// SPDX-License-Identifier: GPL-2.0-only
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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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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.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_ipv6.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("Xtables: MAC address match");
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MODULE_ALIAS("ipt_mac");
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MODULE_ALIAS("ip6t_mac");
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static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_mac_info *info = par->matchinfo;
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bool ret;
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if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER)
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return false;
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if (skb_mac_header(skb) < skb->head)
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return false;
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if (skb_mac_header(skb) + ETH_HLEN > skb->data)
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return false;
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ret = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr);
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ret ^= info->invert;
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return ret;
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}
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static struct xt_match mac_mt_reg __read_mostly = {
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.name = "mac",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.match = mac_mt,
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.matchsize = sizeof(struct xt_mac_info),
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.hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD),
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.me = THIS_MODULE,
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};
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static int __init mac_mt_init(void)
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{
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return xt_register_match(&mac_mt_reg);
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}
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static void __exit mac_mt_exit(void)
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{
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xt_unregister_match(&mac_mt_reg);
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}
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module_init(mac_mt_init);
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module_exit(mac_mt_exit);
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