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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135// 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/hex.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]){ get_random_bytes(b, 16); /* revision 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);