1 /* This is a module which is used for setting up fake conntracks
2 * on packets so that they are not seen by the conntrack/NAT code.
4 #include <linux/module.h>
5 #include <linux/skbuff.h>
7 #include <linux/netfilter_ipv4/ip_tables.h>
8 #include <linux/netfilter_ipv4/ip_conntrack.h>
11 target(struct sk_buff **pskb,
12 const struct net_device *in,
13 const struct net_device *out,
18 /* Previously seen (loopback)? Ignore. */
19 if ((*pskb)->nfct != NULL)
22 /* Attach fake conntrack entry.
23 If there is a real ct entry correspondig to this packet,
24 it'll hang aroun till timing out. We don't deal with it
25 for performance reasons. JK */
26 (*pskb)->nfct = &ip_conntrack_untracked.infos[IP_CT_NEW];
27 nf_conntrack_get((*pskb)->nfct);
33 checkentry(const char *tablename,
34 const struct ipt_entry *e,
36 unsigned int targinfosize,
37 unsigned int hook_mask)
39 if (targinfosize != 0) {
40 printk(KERN_WARNING "NOTRACK: targinfosize %u != 0\n",
45 if (strcmp(tablename, "raw") != 0) {
46 printk(KERN_WARNING "NOTRACK: can only be called from \"raw\" table, not \"%s\"\n", tablename);
53 static struct ipt_target ipt_notrack_reg = {
56 .checkentry = checkentry,
60 static int __init init(void)
62 if (ipt_register_target(&ipt_notrack_reg))
68 static void __exit fini(void)
70 ipt_unregister_target(&ipt_notrack_reg);
75 MODULE_LICENSE("GPL");