1 /* $FreeBSD$ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 * 8 * $Id$ 9 */ 10 11 #include "ipf.h" 12 13 14 void 15 fill6bits(int bits, u_int *msk) 16 { 17 if (bits == 0) { 18 msk[0] = 0; 19 msk[1] = 0; 20 msk[2] = 0; 21 msk[3] = 0; 22 return; 23 } 24 25 msk[0] = 0xffffffff; 26 msk[1] = 0xffffffff; 27 msk[2] = 0xffffffff; 28 msk[3] = 0xffffffff; 29 30 if (bits == 128) 31 return; 32 if (bits > 96) { 33 msk[3] = htonl(msk[3] << (128 - bits)); 34 } else if (bits > 64) { 35 msk[3] = 0; 36 msk[2] = htonl(msk[2] << (96 - bits)); 37 } else if (bits > 32) { 38 msk[3] = 0; 39 msk[2] = 0; 40 msk[1] = htonl(msk[1] << (64 - bits)); 41 } else { 42 msk[3] = 0; 43 msk[2] = 0; 44 msk[1] = 0; 45 msk[0] = htonl(msk[0] << (32 - bits)); 46 } 47 } 48