Thanks to Harald for all the comments.

o libnetfilter_conntrack.h splitted into two parts: what is visible to 
application programs and what is visible to extensions.
o Killed includes asm/types.h and linux/if.h
o Fixed nasty wrong ipv6 definition
o Stolen the status bits from ip_conntrack.h, we don't include ip_conntrack.h
anymore.
o move nfct_handle to libnetfilter_conntrack.c: better for encapsulation

1 files changed, 28 insertions, 0 deletions

diff --git a/include/libnetfilter_conntrack/libnetfilter_conntrack_extensions.h b/include/libnetfilter_conntrack/libnetfilter_conntrack_extensions.h
new file mode 100644
index 0000000..4900541
--- /dev/null
+++ b/include/libnetfilter_conntrack/libnetfilter_conntrack_extensions.h
@@ -0,0 +1,28 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#ifndef _LIBNETFILTER_CONNTRACK_EXTENSIONS_H_
+#define _LIBNETFILTER_CONNTRACK_EXTENSIONS_H_
+
+#include "linux_list.h"
+
+struct nfct_proto {
+	struct list_head head;
+	
+	char 		*name;
+	u_int8_t 	protonum;
+	char		*version;
+	
+	void (*parse_proto)(struct nfattr **, struct nfct_tuple *);
+	void (*parse_protoinfo)(struct nfattr **, struct nfct_conntrack *);
+	int (*print_protoinfo)(char *, union nfct_protoinfo *);
+	int (*print_proto)(char *, struct nfct_tuple *);
+};
+
+extern void nfct_register_proto(struct nfct_proto *h);
+
+#endif