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/*
MACSAVE target
Copyright (C) 2006 Jonathan Zarate
Licensed under GNU GPL v2 or later.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ipt_MACSAVE.h>
static unsigned int target(struct sk_buff **pskb, unsigned int hooknum,
const struct net_device *in, const struct net_device *out,
const void *targinfo, void *userinfo)
{
// const struct ipt_MACSAVE_target_info *info = targinfo;
struct sk_buff *skb = *pskb;
struct ip_conntrack *ct;
enum ip_conntrack_info ctinfo;
if ((skb->mac.raw >= skb->head) && ((skb->mac.raw + ETH_HLEN) <= skb->data)) {
ct = ip_conntrack_get(skb, &ctinfo);
if (ct) {
memcpy(ct->macsave, skb->mac.ethernet->h_source, sizeof(ct->macsave));
}
}
return IPT_CONTINUE;
}
static int checkentry(const char *tablename, const struct ipt_entry *e, void *targinfo,
unsigned int targinfosize, unsigned int hook_mask)
{
if (targinfosize != IPT_ALIGN(sizeof(struct ipt_MACSAVE_target_info))) {
printk(KERN_ERR "MACSAVE: Invalid data size\n");
return 0;
}
if (hook_mask & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_IN))) {
printk(KERN_ERR "MACSAVE: Valid only in PREROUTING, FORWARD and INPUT\n");
return 0;
}
return 1;
}
static struct ipt_target macsave_target
= { { NULL, NULL }, "MACSAVE", target, checkentry, NULL, THIS_MODULE };
static int __init init(void)
{
return ipt_register_target(&macsave_target);
}
static void __exit fini(void)
{
ipt_unregister_target(&macsave_target);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
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