X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fnetfilter%2Fxt_NOTRACK.c;fp=net%2Fnetfilter%2Fxt_NOTRACK.c;h=98f4b5363ce8e8e4adcce549cfe63119c24db610;hb=16cf0ec7408f389279d413869e94c1a351392f97;hp=0000000000000000000000000000000000000000;hpb=65da6b7c3bf0bd6a149128079565e5f4efec28ac;p=linux-2.6.git

diff --git a/net/netfilter/xt_NOTRACK.c b/net/netfilter/xt_NOTRACK.c
new file mode 100644
index 000000000..98f4b5363
--- /dev/null
+++ b/net/netfilter/xt_NOTRACK.c
@@ -0,0 +1,77 @@
+/* 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_compat.h>
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_NOTRACK");
+
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const struct xt_target *target,
+       const void *targinfo,
+       void *userinfo)
+{
+	/* Previously seen (loopback)? Ignore. */
+	if ((*pskb)->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 */
+	nf_ct_untrack(*pskb);
+	(*pskb)->nfctinfo = IP_CT_NEW;
+	nf_conntrack_get((*pskb)->nfct);
+
+	return XT_CONTINUE;
+}
+
+static struct xt_target notrack_reg = {
+	.name		= "NOTRACK",
+	.target		= target,
+	.targetsize	= 0,
+	.table		= "raw",
+	.family		= AF_INET,
+	.me		= THIS_MODULE,
+};
+
+static struct xt_target notrack6_reg = {
+	.name		= "NOTRACK",
+	.target		= target,
+	.targetsize	= 0,
+	.table		= "raw",
+	.family		= AF_INET6,
+	.me		= THIS_MODULE,
+};
+
+static int __init xt_notrack_init(void)
+{
+	int ret;
+
+	ret = xt_register_target(&notrack_reg);
+	if (ret)
+		return ret;
+
+	ret = xt_register_target(&notrack6_reg);
+	if (ret)
+		xt_unregister_target(&notrack_reg);
+
+	return ret;
+}
+
+static void __exit xt_notrack_fini(void)
+{
+	xt_unregister_target(&notrack6_reg);
+	xt_unregister_target(&notrack_reg);
+}
+
+module_init(xt_notrack_init);
+module_exit(xt_notrack_fini);