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 #include "ipf.h" 11 ntomask(v,nbits,ap)12int ntomask(v, nbits, ap) 13 int v, nbits; 14 u_32_t *ap; 15 { 16 u_32_t mask; 17 18 if (nbits < 0) 19 return -1; 20 21 switch (v) 22 { 23 case 4 : 24 if (nbits > 32 || use_inet6 != 0) 25 return -1; 26 if (nbits == 0) { 27 mask = 0; 28 } else { 29 mask = 0xffffffff; 30 mask <<= (32 - nbits); 31 } 32 *ap = htonl(mask); 33 break; 34 35 case 6 : 36 if (nbits > 128) 37 return -1; 38 fill6bits(nbits, ap); 39 break; 40 41 default : 42 return -1; 43 } 44 return 0; 45 } 46