1
2/*
3 * Copyright (C) 2012 by Darren Reed.
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 *
7 * $Id$
8 */
9
10#include "ipf.h"
11
12
13void
14fill6bits(int bits, u_int *msk)
15{
16	if (bits == 0) {
17		msk[0] = 0;
18		msk[1] = 0;
19		msk[2] = 0;
20		msk[3] = 0;
21		return;
22	}
23
24	msk[0] = 0xffffffff;
25	msk[1] = 0xffffffff;
26	msk[2] = 0xffffffff;
27	msk[3] = 0xffffffff;
28
29	if (bits == 128)
30		return;
31	if (bits > 96) {
32		msk[3] = htonl(msk[3] << (128 - bits));
33	} else if (bits > 64) {
34		msk[3] = 0;
35		msk[2] = htonl(msk[2] << (96 - bits));
36	} else if (bits > 32) {
37		msk[3] = 0;
38		msk[2] = 0;
39		msk[1] = htonl(msk[1] << (64 - bits));
40	} else {
41		msk[3] = 0;
42		msk[2] = 0;
43		msk[1] = 0;
44		msk[0] = htonl(msk[0] << (32 - bits));
45	}
46}
47