mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 15:26:21 +09:00
1802d0beec
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Unified UUID/GUID definition
|
|
*
|
|
* Copyright (C) 2009, 2016 Intel Corp.
|
|
* Huang Ying <ying.huang@intel.com>
|
|
*/
|
|
|
|
#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);
|
|
|
|
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);
|