1fab1c232SHuang Ying /* 2fab1c232SHuang Ying * Unified UUID/GUID definition 3fab1c232SHuang Ying * 4fab1c232SHuang Ying * Copyright (C) 2009, Intel Corp. 5fab1c232SHuang Ying * Huang Ying <ying.huang@intel.com> 6fab1c232SHuang Ying * 7fab1c232SHuang Ying * This program is free software; you can redistribute it and/or 8fab1c232SHuang Ying * modify it under the terms of the GNU General Public License version 9fab1c232SHuang Ying * 2 as published by the Free Software Foundation; 10fab1c232SHuang Ying * 11fab1c232SHuang Ying * This program is distributed in the hope that it will be useful, 12fab1c232SHuang Ying * but WITHOUT ANY WARRANTY; without even the implied warranty of 13fab1c232SHuang Ying * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14fab1c232SHuang Ying * GNU General Public License for more details. 15fab1c232SHuang Ying * 16fab1c232SHuang Ying * You should have received a copy of the GNU General Public License 17fab1c232SHuang Ying * along with this program; if not, write to the Free Software 18fab1c232SHuang Ying * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19fab1c232SHuang Ying */ 20fab1c232SHuang Ying 21fab1c232SHuang Ying #include <linux/kernel.h> 228bc3bcc9SPaul Gortmaker #include <linux/export.h> 23fab1c232SHuang Ying #include <linux/uuid.h> 24fab1c232SHuang Ying #include <linux/random.h> 25fab1c232SHuang Ying 26fab1c232SHuang Ying static void __uuid_gen_common(__u8 b[16]) 27fab1c232SHuang Ying { 28*cedddb00SAkinobu Mita prandom_bytes(b, 16); 29fab1c232SHuang Ying /* reversion 0b10 */ 30fab1c232SHuang Ying b[8] = (b[8] & 0x3F) | 0x80; 31fab1c232SHuang Ying } 32fab1c232SHuang Ying 33fab1c232SHuang Ying void uuid_le_gen(uuid_le *lu) 34fab1c232SHuang Ying { 35fab1c232SHuang Ying __uuid_gen_common(lu->b); 36fab1c232SHuang Ying /* version 4 : random generation */ 37fab1c232SHuang Ying lu->b[7] = (lu->b[7] & 0x0F) | 0x40; 38fab1c232SHuang Ying } 39fab1c232SHuang Ying EXPORT_SYMBOL_GPL(uuid_le_gen); 40fab1c232SHuang Ying 41fab1c232SHuang Ying void uuid_be_gen(uuid_be *bu) 42fab1c232SHuang Ying { 43fab1c232SHuang Ying __uuid_gen_common(bu->b); 44fab1c232SHuang Ying /* version 4 : random generation */ 45fab1c232SHuang Ying bu->b[6] = (bu->b[6] & 0x0F) | 0x40; 46fab1c232SHuang Ying } 47fab1c232SHuang Ying EXPORT_SYMBOL_GPL(uuid_be_gen); 48