--- libelwix/inc/elwix/anet.h	2013/05/30 09:07:33	1.2
+++ libelwix/inc/elwix/anet.h	2013/06/03 10:52:28	1.2.2.1
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: anet.h,v 1.2 2013/05/30 09:07:33 misho Exp $
+* $Id: anet.h,v 1.2.2.1 2013/06/03 10:52:28 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -61,6 +61,8 @@ typedef union {
 	struct sockaddr_dl	sdl;
 } sockaddr_t;
 #define E_SOCKADDR_INIT	{ .ss = { 0 } }
+
+#define E_CIDRMASK(x)	((((1 << (x)) - 1) << (32 - (x))) & 0xFFFFFFFF)
 
 
 /*