diff options
Diffstat (limited to 'net/netfilter/xt_mac.c')
-rw-r--r-- | net/netfilter/xt_mac.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/net/netfilter/xt_mac.c b/net/netfilter/xt_mac.c new file mode 100644 index 0000000000..81649da57b --- /dev/null +++ b/net/netfilter/xt_mac.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Kernel module to match MAC address parameters. */ + +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> + */ + +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/etherdevice.h> + +#include <linux/netfilter_ipv4.h> +#include <linux/netfilter_ipv6.h> +#include <linux/netfilter/xt_mac.h> +#include <linux/netfilter/x_tables.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); +MODULE_DESCRIPTION("Xtables: MAC address match"); +MODULE_ALIAS("ipt_mac"); +MODULE_ALIAS("ip6t_mac"); + +static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par) +{ + const struct xt_mac_info *info = par->matchinfo; + bool ret; + + if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER) + return false; + if (skb_mac_header(skb) < skb->head) + return false; + if (skb_mac_header(skb) + ETH_HLEN > skb->data) + return false; + ret = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr); + ret ^= info->invert; + return ret; +} + +static struct xt_match mac_mt_reg __read_mostly = { + .name = "mac", + .revision = 0, + .family = NFPROTO_UNSPEC, + .match = mac_mt, + .matchsize = sizeof(struct xt_mac_info), + .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_FORWARD), + .me = THIS_MODULE, +}; + +static int __init mac_mt_init(void) +{ + return xt_register_match(&mac_mt_reg); +} + +static void __exit mac_mt_exit(void) +{ + xt_unregister_match(&mac_mt_reg); +} + +module_init(mac_mt_init); +module_exit(mac_mt_exit); |