| Current Path : /usr/src/contrib/ipfilter/lib/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/ipfilter/lib/ntomask.c |
/* $FreeBSD: release/9.1.0/contrib/ipfilter/lib/ntomask.c 170268 2007-06-04 02:54:36Z darrenr $ */
/*
* Copyright (C) 2002-2005 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* $Id: ntomask.c,v 1.6.2.1 2006/06/16 17:21:07 darrenr Exp $
*/
#include "ipf.h"
int ntomask(v, nbits, ap)
int v, nbits;
u_32_t *ap;
{
u_32_t mask;
if (nbits < 0)
return -1;
switch (v)
{
case 4 :
if (nbits > 32 || use_inet6 != 0)
return -1;
if (nbits == 0) {
mask = 0;
} else {
mask = 0xffffffff;
mask <<= (32 - nbits);
}
*ap = htonl(mask);
break;
case 6 :
if ((nbits > 128) || (use_inet6 == 0))
return -1;
fill6bits(nbits, ap);
break;
default :
return -1;
}
return 0;
}