--- src/sys/sys/mbuf.h	2008/04/06 18:58:10	1.47
+++ src/sys/sys/mbuf.h	2008/05/02 07:40:32	1.48
@@ -261,6 +261,11 @@ struct mbuf {
 #define	MT_OOBDATA	6	/* expedited data  */
 #define	MT_NTYPES	7	/* number of mbuf types for mbtypes[] */
 
+struct mbuf_chain {
+	struct mbuf	*mc_head;
+	struct mbuf	*mc_tail;
+};
+
 /*
  * General mbuf allocator statistics structure.
  */