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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * UUID/GUID definition
4 *
5 * Copyright (C) 2010, 2016 Intel Corp.
6 * Huang Ying <ying.huang@intel.com>
7 */
8#ifndef _LINUX_UUID_H_
9#define _LINUX_UUID_H_
10
11#include <linux/string.h>
12
13#define UUID_SIZE 16
14
15typedef struct {
16 __u8 b[UUID_SIZE];
17} guid_t;
18
19typedef struct {
20 __u8 b[UUID_SIZE];
21} uuid_t;
22
23#define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
24((guid_t) \
25{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
26 (b) & 0xff, ((b) >> 8) & 0xff, \
27 (c) & 0xff, ((c) >> 8) & 0xff, \
28 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
29
30#define UUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \
31((uuid_t) \
32{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
33 ((b) >> 8) & 0xff, (b) & 0xff, \
34 ((c) >> 8) & 0xff, (c) & 0xff, \
35 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
36
37/*
38 * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
39 * not including trailing NUL.
40 */
41#define UUID_STRING_LEN 36
42
43extern const guid_t guid_null;
44extern const uuid_t uuid_null;
45
46static inline bool guid_equal(const guid_t *u1, const guid_t *u2)
47{
48 return memcmp(p: u1, q: u2, size: sizeof(guid_t)) == 0;
49}
50
51static inline void guid_copy(guid_t *dst, const guid_t *src)
52{
53 memcpy(dst, src, sizeof(guid_t));
54}
55
56static inline void import_guid(guid_t *dst, const __u8 *src)
57{
58 memcpy(dst, src, sizeof(guid_t));
59}
60
61static inline void export_guid(__u8 *dst, const guid_t *src)
62{
63 memcpy(dst, src, sizeof(guid_t));
64}
65
66static inline bool guid_is_null(const guid_t *guid)
67{
68 return guid_equal(u1: guid, u2: &guid_null);
69}
70
71static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2)
72{
73 return memcmp(p: u1, q: u2, size: sizeof(uuid_t)) == 0;
74}
75
76static inline void uuid_copy(uuid_t *dst, const uuid_t *src)
77{
78 memcpy(dst, src, sizeof(uuid_t));
79}
80
81static inline void import_uuid(uuid_t *dst, const __u8 *src)
82{
83 memcpy(dst, src, sizeof(uuid_t));
84}
85
86static inline void export_uuid(__u8 *dst, const uuid_t *src)
87{
88 memcpy(dst, src, sizeof(uuid_t));
89}
90
91static inline bool uuid_is_null(const uuid_t *uuid)
92{
93 return uuid_equal(u1: uuid, u2: &uuid_null);
94}
95
96void generate_random_uuid(unsigned char uuid[16]);
97void generate_random_guid(unsigned char guid[16]);
98
99extern void guid_gen(guid_t *u);
100extern void uuid_gen(uuid_t *u);
101
102bool __must_check uuid_is_valid(const char *uuid);
103
104extern const u8 guid_index[16];
105extern const u8 uuid_index[16];
106
107int guid_parse(const char *uuid, guid_t *u);
108int uuid_parse(const char *uuid, uuid_t *u);
109
110#endif
111

source code of linux/include/linux/uuid.h