1/*
2 * Copyright (C) 2002 by Darren Reed.
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 *
6 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
7 * Use is subject to license terms.
8 */
9
10#pragma ident	"%Z%%M%	%I%	%E% SMI"
11
12#include "ipf.h"
13
14int ntomask(v, nbits, ap)
15int v, nbits;
16u_32_t *ap;
17{
18	u_32_t mask;
19
20	if (nbits < 0)
21		return -1;
22
23	switch (v)
24	{
25	case 4 :
26		if (nbits > 32 || use_inet6 != 0)
27			return -1;
28		if (nbits == 0) {
29			mask = 0;
30		} else {
31			mask = 0xffffffff;
32			mask <<= (32 - nbits);
33		}
34		*ap = htonl(mask);
35		break;
36
37	case 6 :
38		if (nbits > 128)
39			return -1;
40		fill6bits(nbits, ap);
41		break;
42
43	default :
44		return -1;
45	}
46	return 0;
47}
48