47 lines
623 B
C
47 lines
623 B
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 2012 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* $Id$
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*/
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#include "ipf.h"
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int
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ntomask(int family, int nbits, u_32_t *ap)
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{
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u_32_t mask;
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if (nbits < 0)
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return(-1);
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switch (family)
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{
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case AF_INET :
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if (nbits > 32 || use_inet6 == 1)
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return(-1);
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if (nbits == 0) {
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mask = 0;
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} else {
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mask = 0xffffffff;
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mask <<= (32 - nbits);
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}
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*ap = htonl(mask);
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break;
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case 0 :
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case AF_INET6 :
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if ((nbits > 128) || (use_inet6 == -1))
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return(-1);
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fill6bits(nbits, ap);
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break;
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default :
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return(-1);
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}
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return(0);
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}
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