forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
2.9 KiB
133 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Unified UUID/GUID definition |
|
* |
|
* Copyright (C) 2009, 2016 Intel Corp. |
|
* Huang Ying <[email protected]> |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/ctype.h> |
|
#include <linux/errno.h> |
|
#include <linux/export.h> |
|
#include <linux/uuid.h> |
|
#include <linux/random.h> |
|
|
|
const guid_t guid_null; |
|
EXPORT_SYMBOL(guid_null); |
|
const uuid_t uuid_null; |
|
EXPORT_SYMBOL(uuid_null); |
|
|
|
const u8 guid_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
|
const u8 uuid_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
|
|
|
/** |
|
* generate_random_uuid - generate a random UUID |
|
* @uuid: where to put the generated UUID |
|
* |
|
* Random UUID interface |
|
* |
|
* Used to create a Boot ID or a filesystem UUID/GUID, but can be |
|
* useful for other kernel drivers. |
|
*/ |
|
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); |
|
|
|
void generate_random_guid(unsigned char guid[16]) |
|
{ |
|
get_random_bytes(guid, 16); |
|
/* Set GUID version to 4 --- truly random generation */ |
|
guid[7] = (guid[7] & 0x0F) | 0x40; |
|
/* Set the GUID variant to DCE */ |
|
guid[8] = (guid[8] & 0x3F) | 0x80; |
|
} |
|
EXPORT_SYMBOL(generate_random_guid); |
|
|
|
static void __uuid_gen_common(__u8 b[16]) |
|
{ |
|
prandom_bytes(b, 16); |
|
/* reversion 0b10 */ |
|
b[8] = (b[8] & 0x3F) | 0x80; |
|
} |
|
|
|
void guid_gen(guid_t *lu) |
|
{ |
|
__uuid_gen_common(lu->b); |
|
/* version 4 : random generation */ |
|
lu->b[7] = (lu->b[7] & 0x0F) | 0x40; |
|
} |
|
EXPORT_SYMBOL_GPL(guid_gen); |
|
|
|
void uuid_gen(uuid_t *bu) |
|
{ |
|
__uuid_gen_common(bu->b); |
|
/* version 4 : random generation */ |
|
bu->b[6] = (bu->b[6] & 0x0F) | 0x40; |
|
} |
|
EXPORT_SYMBOL_GPL(uuid_gen); |
|
|
|
/** |
|
* uuid_is_valid - checks if a UUID string is 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); |
|
|
|
static int __uuid_parse(const char *uuid, __u8 b[16], const u8 ei[16]) |
|
{ |
|
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++) { |
|
int hi = hex_to_bin(uuid[si[i] + 0]); |
|
int lo = hex_to_bin(uuid[si[i] + 1]); |
|
|
|
b[ei[i]] = (hi << 4) | lo; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int guid_parse(const char *uuid, guid_t *u) |
|
{ |
|
return __uuid_parse(uuid, u->b, guid_index); |
|
} |
|
EXPORT_SYMBOL(guid_parse); |
|
|
|
int uuid_parse(const char *uuid, uuid_t *u) |
|
{ |
|
return __uuid_parse(uuid, u->b, uuid_index); |
|
} |
|
EXPORT_SYMBOL(uuid_parse);
|
|
|