ntomask.c revision 145510 
1/*	$NetBSD$	*/
2
3#include "ipf.h"
4
5int ntomask(v, nbits, ap)
6int v, nbits;
7u_32_t *ap;
8{
9	u_32_t mask;
10
11	if (nbits < 0)
12		return -1;
13
14	switch (v)
15	{
16	case 4 :
17		if (nbits > 32 || use_inet6 != 0)
18			return -1;
19		if (nbits == 0) {
20			mask = 0;
21		} else {
22			mask = 0xffffffff;
23			mask <<= (32 - nbits);
24		}
25		*ap = htonl(mask);
26		break;
27
28	case 6 :
29		if ((nbits > 128) || (use_inet6 == 0))
30			return -1;
31		fill6bits(nbits, ap);
32		break;
33
34	default :
35		return -1;
36	}
37	return 0;
38}
39