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Commit | Line | Data |
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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 | /*************************************************************** | |
27 | * Random UUID interface | |
28 | * | |
29 | * Used here for a Boot ID, but can be useful for other kernel | |
30 | * drivers. | |
31 | ***************************************************************/ | |
32 | ||
33 | /* | |
34 | * Generate random UUID | |
35 | */ | |
36 | void generate_random_uuid(unsigned char uuid[16]) | |
37 | { | |
38 | get_random_bytes(uuid, 16); | |
39 | /* Set UUID version to 4 --- truly random generation */ | |
40 | uuid[6] = (uuid[6] & 0x0F) | 0x40; | |
41 | /* Set the UUID variant to DCE */ | |
42 | uuid[8] = (uuid[8] & 0x3F) | 0x80; | |
43 | } | |
44 | EXPORT_SYMBOL(generate_random_uuid); | |
45 | ||
46 | static void __uuid_gen_common(__u8 b[16]) | |
47 | { | |
48 | prandom_bytes(b, 16); | |
49 | /* reversion 0b10 */ | |
50 | b[8] = (b[8] & 0x3F) | 0x80; | |
51 | } | |
52 | ||
53 | void uuid_le_gen(uuid_le *lu) | |
54 | { | |
55 | __uuid_gen_common(lu->b); | |
56 | /* version 4 : random generation */ | |
57 | lu->b[7] = (lu->b[7] & 0x0F) | 0x40; | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(uuid_le_gen); | |
60 | ||
61 | void uuid_be_gen(uuid_be *bu) | |
62 | { | |
63 | __uuid_gen_common(bu->b); | |
64 | /* version 4 : random generation */ | |
65 | bu->b[6] = (bu->b[6] & 0x0F) | 0x40; | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(uuid_be_gen); |