1 files changed, 53 insertions, 0 deletions
diff --git a/net/netfilter/xt_NOTRACK.c b/net/netfilter/xt_NOTRACK.c
new file mode 100644
index 0000000..e7a0a54
--- /dev/null
+++ b/net/netfilter/xt_NOTRACK.c
@@ -0,0 +1,53 @@
+/* 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_DESCRIPTION("Xtables: Disabling connection tracking for packets");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_NOTRACK");
+MODULE_ALIAS("ip6t_NOTRACK");
+
+static unsigned int
+notrack_tg(struct sk_buff *skb, const struct xt_target_param *par)
+{
+	/* 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 notrack_tg_reg __read_mostly = {
+	.name     = "NOTRACK",
+	.revision = 0,
+	.family   = NFPROTO_UNSPEC,
+	.target   = notrack_tg,
+	.table    = "raw",
+	.me       = THIS_MODULE,
+};
+
+static int __init notrack_tg_init(void)
+{
+	return xt_register_target(&notrack_tg_reg);
+}
+
+static void __exit notrack_tg_exit(void)
+{
+	xt_unregister_target(&notrack_tg_reg);
+}
+
+module_init(notrack_tg_init);
+module_exit(notrack_tg_exit);