Usefull for all protocols which do not add additional data, such
as GRE or UDPlite.

Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>

Index: net-next-2.6/include/net/netfilter/nf_conntrack_l4proto.h
===================================================================
--- net-next-2.6.orig/include/net/netfilter/nf_conntrack_l4proto.h
+++ net-next-2.6/include/net/netfilter/nf_conntrack_l4proto.h
@@ -121,6 +121,7 @@ extern int nf_ct_port_tuple_to_nlattr(st
 				      const struct nf_conntrack_tuple *tuple);
 extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
 				      struct nf_conntrack_tuple *t);
+extern int nf_ct_port_nlattr_tuple_size(void);
 extern const struct nla_policy nf_ct_port_nla_policy[];
 
 #ifdef CONFIG_SYSCTL
Index: net-next-2.6/net/netfilter/nf_conntrack_core.c
===================================================================
--- net-next-2.6.orig/net/netfilter/nf_conntrack_core.c
+++ net-next-2.6/net/netfilter/nf_conntrack_core.c
@@ -902,6 +902,12 @@ int nf_ct_port_nlattr_to_tuple(struct nl
 	return 0;
 }
 EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple);
+
+int nf_ct_port_nlattr_tuple_size(void)
+{
+	return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
+}
+EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size);
 #endif
 
 /* Used by ipt_REJECT and ip6t_REJECT. */

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