Line data    Source code

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