--- libelwix/src/net.c	2013/05/30 09:07:33	1.2
+++ libelwix/src/net.c	2013/06/03 14:00:26	1.3
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: net.c,v 1.2 2013/05/30 09:07:33 misho Exp $
+* $Id: net.c,v 1.3 2013/06/03 14:00:26 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -280,4 +280,46 @@ e_usleep(u_int usec)
 	struct timeval tv = { (time_t) (usec / 1000000), (long) (usec % 1000000) };
 
 	return select(0, NULL, NULL, NULL, &tv);
+}
+
+/*
+ * e_innet() - Test address match in network
+ *
+ * @net = network
+ * @addr = address
+ * return: -1 error, 0 match or 1 not match
+ */
+int
+e_innet(netaddr_t * __restrict net, inaddr_t * __restrict addr)
+{
+	register int i;
+	int ret = 0;
+
+	if (!net || !addr)
+		return -1;
+
+	switch (net->addr.sa.sa_family) {
+		case AF_INET:
+			for (i = 0; i < sizeof(struct in_addr); i++) {
+				ret = ((caddr_t) &net->addr.sin.sin_addr.s_addr)[i] & 
+					net->mask.in.s4_addr[i];
+				ret -= addr->in.s4_addr[i] & net->mask.in.s4_addr[i];
+				if (ret)
+					break;
+			}
+			break;
+		case AF_INET6:
+			for (i = 0; i < sizeof(struct in6_addr); i++) {
+				ret = net->addr.sin6.sin6_addr.s6_addr[i] & 
+					net->mask.in6.s6_addr[i];
+				ret -= addr->in6.s6_addr[i] & net->mask.in6.s6_addr[i];
+				if (ret)
+					break;
+			}
+			break;
+		default:
+			return -1;
+	}
+
+	return !!ret;
 }