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/* Kernel module to match MAC address parameters. */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netfilter_ipv6/ip6t_mac.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
static int
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const void *matchinfo,
int offset,
const void *hdr,
u_int16_t datalen,
int *hotdrop)
{
const struct ip6t_mac_info *info = matchinfo;
/* Is mac pointer valid? */
return (skb->mac.raw >= skb->head
&& (skb->mac.raw + ETH_HLEN) <= skb->data
/* If so, compare... */
&& ((memcmp(skb->mac.ethernet->h_source, info->srcaddr, ETH_ALEN)
== 0) ^ info->invert));
}
static int
ip6t_mac_checkentry(const char *tablename,
const struct ip6t_ip6 *ip,
void *matchinfo,
unsigned int matchsize,
unsigned int hook_mask)
{
if (hook_mask
& ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN))) {
printk("ip6t_mac: only valid for PRE_ROUTING or LOCAL_IN.\n");
return 0;
}
if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_mac_info)))
return 0;
return 1;
}
static struct ip6t_match mac_match
= { { NULL, NULL }, "mac", &match, &ip6t_mac_checkentry, NULL, THIS_MODULE };
static int __init init(void)
{
return ip6t_register_match(&mac_match);
}
static void __exit fini(void)
{
ip6t_unregister_match(&mac_match);
}
module_init(init);
module_exit(fini);
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