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
15 typedef struct {
16 __u8 b[UUID_SIZE];
17 } guid_t;
18
19 typedef 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
43 extern const guid_t guid_null;
44 extern const uuid_t uuid_null;
45
guid_equal(const guid_t * u1,const guid_t * u2)46 static inline bool guid_equal(const guid_t *u1, const guid_t *u2)
47 {
48 return memcmp(u1, u2, sizeof(guid_t)) == 0;
49 }
50
guid_copy(guid_t * dst,const guid_t * src)51 static inline void guid_copy(guid_t *dst, const guid_t *src)
52 {
53 memcpy(dst, src, sizeof(guid_t));
54 }
55
import_guid(guid_t * dst,const __u8 * src)56 static inline void import_guid(guid_t *dst, const __u8 *src)
57 {
58 memcpy(dst, src, sizeof(guid_t));
59 }
60
export_guid(__u8 * dst,const guid_t * src)61 static inline void export_guid(__u8 *dst, const guid_t *src)
62 {
63 memcpy(dst, src, sizeof(guid_t));
64 }
65
guid_is_null(const guid_t * guid)66 static inline bool guid_is_null(const guid_t *guid)
67 {
68 return guid_equal(guid, &guid_null);
69 }
70
uuid_equal(const uuid_t * u1,const uuid_t * u2)71 static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2)
72 {
73 return memcmp(u1, u2, sizeof(uuid_t)) == 0;
74 }
75
uuid_copy(uuid_t * dst,const uuid_t * src)76 static inline void uuid_copy(uuid_t *dst, const uuid_t *src)
77 {
78 memcpy(dst, src, sizeof(uuid_t));
79 }
80
import_uuid(uuid_t * dst,const __u8 * src)81 static inline void import_uuid(uuid_t *dst, const __u8 *src)
82 {
83 memcpy(dst, src, sizeof(uuid_t));
84 }
85
export_uuid(__u8 * dst,const uuid_t * src)86 static inline void export_uuid(__u8 *dst, const uuid_t *src)
87 {
88 memcpy(dst, src, sizeof(uuid_t));
89 }
90
uuid_is_null(const uuid_t * uuid)91 static inline bool uuid_is_null(const uuid_t *uuid)
92 {
93 return uuid_equal(uuid, &uuid_null);
94 }
95
96 void generate_random_uuid(unsigned char uuid[16]);
97 void generate_random_guid(unsigned char guid[16]);
98
99 extern void guid_gen(guid_t *u);
100 extern void uuid_gen(uuid_t *u);
101
102 bool __must_check uuid_is_valid(const char *uuid);
103
104 extern const u8 guid_index[16];
105 extern const u8 uuid_index[16];
106
107 int guid_parse(const char *uuid, guid_t *u);
108 int uuid_parse(const char *uuid, uuid_t *u);
109
110 #endif
111