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 13 void 14 fill6bits(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