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128 lines
3.1 KiB
128 lines
3.1 KiB
/* |
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* Unified UUID/GUID definition |
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* |
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* Copyright (C) 2009, 2016 Intel Corp. |
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* Huang Ying <ying.huang@intel.com> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version |
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* 2 as published by the Free Software Foundation; |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/ctype.h> |
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#include <linux/errno.h> |
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#include <linux/export.h> |
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#include <linux/uuid.h> |
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#include <linux/random.h> |
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const u8 uuid_le_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
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EXPORT_SYMBOL(uuid_le_index); |
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const u8 uuid_be_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
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EXPORT_SYMBOL(uuid_be_index); |
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/*************************************************************** |
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* Random UUID interface |
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* |
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* Used here for a Boot ID, but can be useful for other kernel |
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* drivers. |
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***************************************************************/ |
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/* |
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* Generate random UUID |
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*/ |
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void generate_random_uuid(unsigned char uuid[16]) |
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{ |
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get_random_bytes(uuid, 16); |
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/* Set UUID version to 4 --- truly random generation */ |
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uuid[6] = (uuid[6] & 0x0F) | 0x40; |
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/* Set the UUID variant to DCE */ |
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uuid[8] = (uuid[8] & 0x3F) | 0x80; |
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} |
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EXPORT_SYMBOL(generate_random_uuid); |
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static void __uuid_gen_common(__u8 b[16]) |
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{ |
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prandom_bytes(b, 16); |
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/* reversion 0b10 */ |
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b[8] = (b[8] & 0x3F) | 0x80; |
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} |
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void uuid_le_gen(uuid_le *lu) |
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{ |
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__uuid_gen_common(lu->b); |
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/* version 4 : random generation */ |
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lu->b[7] = (lu->b[7] & 0x0F) | 0x40; |
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} |
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EXPORT_SYMBOL_GPL(uuid_le_gen); |
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void uuid_be_gen(uuid_be *bu) |
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{ |
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__uuid_gen_common(bu->b); |
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/* version 4 : random generation */ |
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bu->b[6] = (bu->b[6] & 0x0F) | 0x40; |
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} |
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EXPORT_SYMBOL_GPL(uuid_be_gen); |
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/** |
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* uuid_is_valid - checks if UUID string valid |
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* @uuid: UUID string to check |
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* |
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* Description: |
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* It checks if the UUID string is following the format: |
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* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx |
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* where x is a hex digit. |
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* |
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* Return: true if input is valid UUID string. |
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*/ |
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bool uuid_is_valid(const char *uuid) |
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{ |
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unsigned int i; |
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for (i = 0; i < UUID_STRING_LEN; i++) { |
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if (i == 8 || i == 13 || i == 18 || i == 23) { |
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if (uuid[i] != '-') |
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return false; |
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} else if (!isxdigit(uuid[i])) { |
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return false; |
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} |
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} |
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return true; |
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} |
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EXPORT_SYMBOL(uuid_is_valid); |
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static int __uuid_to_bin(const char *uuid, __u8 b[16], const u8 ei[16]) |
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{ |
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static const u8 si[16] = {0,2,4,6,9,11,14,16,19,21,24,26,28,30,32,34}; |
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unsigned int i; |
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if (!uuid_is_valid(uuid)) |
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return -EINVAL; |
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for (i = 0; i < 16; i++) { |
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int hi = hex_to_bin(uuid[si[i] + 0]); |
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int lo = hex_to_bin(uuid[si[i] + 1]); |
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b[ei[i]] = (hi << 4) | lo; |
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} |
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return 0; |
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} |
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int uuid_le_to_bin(const char *uuid, uuid_le *u) |
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{ |
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return __uuid_to_bin(uuid, u->b, uuid_le_index); |
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} |
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EXPORT_SYMBOL(uuid_le_to_bin); |
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int uuid_be_to_bin(const char *uuid, uuid_be *u) |
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{ |
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return __uuid_to_bin(uuid, u->b, uuid_be_index); |
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} |
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EXPORT_SYMBOL(uuid_be_to_bin);
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