Blame view
lib/uuid.c
3.06 KB
fab1c2324 Unified UUID/GUID... |
1 2 3 |
/* * Unified UUID/GUID definition * |
e3a93bce6 lib/uuid.c: remov... |
4 |
* Copyright (C) 2009, 2016 Intel Corp. |
fab1c2324 Unified UUID/GUID... |
5 6 7 8 9 10 11 12 13 14 |
* Huang Ying <ying.huang@intel.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation; * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. |
fab1c2324 Unified UUID/GUID... |
15 16 17 |
*/ #include <linux/kernel.h> |
2b1b0d667 lib/uuid.c: intro... |
18 19 |
#include <linux/ctype.h> #include <linux/errno.h> |
8bc3bcc93 lib: reduce the u... |
20 |
#include <linux/export.h> |
fab1c2324 Unified UUID/GUID... |
21 22 |
#include <linux/uuid.h> #include <linux/random.h> |
ef40dda5b uuid: hoist uuid_... |
23 24 25 26 |
const guid_t guid_null; EXPORT_SYMBOL(guid_null); const uuid_t uuid_null; EXPORT_SYMBOL(uuid_null); |
f9727a17d uuid: rename uuid... |
27 |
const u8 guid_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
f9727a17d uuid: rename uuid... |
28 |
const u8 uuid_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
2b1b0d667 lib/uuid.c: intro... |
29 |
|
8da4b8c48 lib/uuid.c: move ... |
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 |
/*************************************************************** * Random UUID interface * * Used here for a Boot ID, but can be useful for other kernel * drivers. ***************************************************************/ /* * Generate random UUID */ void generate_random_uuid(unsigned char uuid[16]) { get_random_bytes(uuid, 16); /* Set UUID version to 4 --- truly random generation */ uuid[6] = (uuid[6] & 0x0F) | 0x40; /* Set the UUID variant to DCE */ uuid[8] = (uuid[8] & 0x3F) | 0x80; } EXPORT_SYMBOL(generate_random_uuid); |
fab1c2324 Unified UUID/GUID... |
49 50 |
static void __uuid_gen_common(__u8 b[16]) { |
cedddb000 uuid: use prandom... |
51 |
prandom_bytes(b, 16); |
fab1c2324 Unified UUID/GUID... |
52 53 54 |
/* reversion 0b10 */ b[8] = (b[8] & 0x3F) | 0x80; } |
f9727a17d uuid: rename uuid... |
55 |
void guid_gen(guid_t *lu) |
fab1c2324 Unified UUID/GUID... |
56 57 58 59 60 |
{ __uuid_gen_common(lu->b); /* version 4 : random generation */ lu->b[7] = (lu->b[7] & 0x0F) | 0x40; } |
f9727a17d uuid: rename uuid... |
61 |
EXPORT_SYMBOL_GPL(guid_gen); |
fab1c2324 Unified UUID/GUID... |
62 |
|
f9727a17d uuid: rename uuid... |
63 |
void uuid_gen(uuid_t *bu) |
fab1c2324 Unified UUID/GUID... |
64 65 66 67 68 |
{ __uuid_gen_common(bu->b); /* version 4 : random generation */ bu->b[6] = (bu->b[6] & 0x0F) | 0x40; } |
f9727a17d uuid: rename uuid... |
69 |
EXPORT_SYMBOL_GPL(uuid_gen); |
2b1b0d667 lib/uuid.c: intro... |
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 |
/** * uuid_is_valid - checks if UUID string valid * @uuid: UUID string to check * * Description: * It checks if the UUID string is following the format: * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx * where x is a hex digit. * * Return: true if input is valid UUID string. */ bool uuid_is_valid(const char *uuid) { unsigned int i; for (i = 0; i < UUID_STRING_LEN; i++) { if (i == 8 || i == 13 || i == 18 || i == 23) { if (uuid[i] != '-') return false; } else if (!isxdigit(uuid[i])) { return false; } } return true; } EXPORT_SYMBOL(uuid_is_valid); |
f9727a17d uuid: rename uuid... |
98 |
static int __uuid_parse(const char *uuid, __u8 b[16], const u8 ei[16]) |
2b1b0d667 lib/uuid.c: intro... |
99 100 101 102 103 104 105 106 |
{ static const u8 si[16] = {0,2,4,6,9,11,14,16,19,21,24,26,28,30,32,34}; unsigned int i; if (!uuid_is_valid(uuid)) return -EINVAL; for (i = 0; i < 16; i++) { |
bc9dc9d5e lib/uuid.c: use c... |
107 108 |
int hi = hex_to_bin(uuid[si[i] + 0]); int lo = hex_to_bin(uuid[si[i] + 1]); |
2b1b0d667 lib/uuid.c: intro... |
109 110 111 112 113 114 |
b[ei[i]] = (hi << 4) | lo; } return 0; } |
f9727a17d uuid: rename uuid... |
115 |
int guid_parse(const char *uuid, guid_t *u) |
2b1b0d667 lib/uuid.c: intro... |
116 |
{ |
f9727a17d uuid: rename uuid... |
117 |
return __uuid_parse(uuid, u->b, guid_index); |
2b1b0d667 lib/uuid.c: intro... |
118 |
} |
f9727a17d uuid: rename uuid... |
119 |
EXPORT_SYMBOL(guid_parse); |
2b1b0d667 lib/uuid.c: intro... |
120 |
|
f9727a17d uuid: rename uuid... |
121 |
int uuid_parse(const char *uuid, uuid_t *u) |
2b1b0d667 lib/uuid.c: intro... |
122 |
{ |
f9727a17d uuid: rename uuid... |
123 |
return __uuid_parse(uuid, u->b, uuid_index); |
2b1b0d667 lib/uuid.c: intro... |
124 |
} |
f9727a17d uuid: rename uuid... |
125 |
EXPORT_SYMBOL(uuid_parse); |