This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / netfilter / xt_NOTRACK.c

diff --git a/net/netfilter/xt_NOTRACK.c b/net/netfilter/xt_NOTRACK.c
new file mode 100644 (file)
index 0000000..98f4b53
--- /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);