1 files changed, 47 insertions, 0 deletions
diff --git a/contrib/ipfilter/lib/ntomask.c b/contrib/ipfilter/lib/ntomask.c
new file mode 100644
index 0000000..98e3b26
--- /dev/null
+++ b/contrib/ipfilter/lib/ntomask.c
@@ -0,0 +1,47 @@
+/*	$FreeBSD$	*/
+
+/*
+ * Copyright (C) 2012 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * $Id$
+ */
+
+#include "ipf.h"
+
+int ntomask(family, nbits, ap)
+	int family, nbits;
+	u_32_t *ap;
+{
+	u_32_t mask;
+
+	if (nbits < 0)
+		return -1;
+
+	switch (family)
+	{
+	case AF_INET :
+		if (nbits > 32 || use_inet6 == 1)
+			return -1;
+		if (nbits == 0) {
+			mask = 0;
+		} else {
+			mask = 0xffffffff;
+			mask <<= (32 - nbits);
+		}
+		*ap = htonl(mask);
+		break;
+
+	case 0 :
+	case AF_INET6 :
+		if ((nbits > 128) || (use_inet6 == -1))
+			return -1;
+		fill6bits(nbits, ap);
+		break;
+
+	default :
+		return -1;
+	}
+	return 0;
+}