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/* This is a module which is used for setting up fake conntracks
* on packets so that they are not seen by the conntrack/NAT code.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_conntrack.h>
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_NOTRACK");
MODULE_ALIAS("ip6t_NOTRACK");
static unsigned int
target(struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
const struct xt_target *target,
const void *targinfo)
{
/* Previously seen (loopback)? Ignore. */
if (skb->nfct != NULL)
return XT_CONTINUE;
/* Attach fake conntrack entry.
If there is a real ct entry correspondig to this packet,
it'll hang aroun till timing out. We don't deal with it
for performance reasons. JK */
skb->nfct = &nf_conntrack_untracked.ct_general;
skb->nfctinfo = IP_CT_NEW;
nf_conntrack_get(skb->nfct);
return XT_CONTINUE;
}
static struct xt_target xt_notrack_target[] __read_mostly = {
{
.name = "NOTRACK",
.family = AF_INET,
.target = target,
.table = "raw",
.me = THIS_MODULE,
},
{
.name = "NOTRACK",
.family = AF_INET6,
.target = target,
.table = "raw",
.me = THIS_MODULE,
},
};
static int __init xt_notrack_init(void)
{
return xt_register_targets(xt_notrack_target,
ARRAY_SIZE(xt_notrack_target));
}
static void __exit xt_notrack_fini(void)
{
xt_unregister_targets(xt_notrack_target, ARRAY_SIZE(xt_notrack_target));
}
module_init(xt_notrack_init);
module_exit(xt_notrack_fini);
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