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fab1c232 HY |
1 | /* |
2 | * UUID/GUID definition | |
3 | * | |
e3a93bce | 4 | * Copyright (C) 2010, 2016 Intel Corp. |
fab1c232 HY |
5 | * Huang Ying <ying.huang@intel.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version | |
9 | * 2 as published by the Free Software Foundation; | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
fab1c232 | 15 | */ |
fab1c232 HY |
16 | #ifndef _LINUX_UUID_H_ |
17 | #define _LINUX_UUID_H_ | |
18 | ||
607ca46e | 19 | #include <uapi/linux/uuid.h> |
fab1c232 | 20 | |
ff548773 DH |
21 | /* |
22 | * V1 (time-based) UUID definition [RFC 4122]. | |
23 | * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns | |
24 | * increments since midnight 15th October 1582 | |
25 | * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID | |
26 | * time | |
27 | * - the clock sequence is a 14-bit counter to avoid duplicate times | |
28 | */ | |
29 | struct uuid_v1 { | |
30 | __be32 time_low; /* low part of timestamp */ | |
31 | __be16 time_mid; /* mid part of timestamp */ | |
32 | __be16 time_hi_and_version; /* high part of timestamp and version */ | |
33 | #define UUID_TO_UNIX_TIME 0x01b21dd213814000ULL | |
34 | #define UUID_TIMEHI_MASK 0x0fff | |
35 | #define UUID_VERSION_TIME 0x1000 /* time-based UUID */ | |
36 | #define UUID_VERSION_NAME 0x3000 /* name-based UUID */ | |
37 | #define UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */ | |
38 | u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */ | |
39 | #define UUID_CLOCKHI_MASK 0x3f | |
40 | #define UUID_VARIANT_STD 0x80 | |
41 | u8 clock_seq_low; /* clock seq low */ | |
42 | u8 node[6]; /* spatially unique node ID (MAC addr) */ | |
43 | }; | |
44 | ||
2b1b0d66 AS |
45 | /* |
46 | * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee") | |
47 | * not including trailing NUL. | |
48 | */ | |
49 | #define UUID_STRING_LEN 36 | |
b544f3fd | 50 | |
fab1c232 HY |
51 | static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2) |
52 | { | |
53 | return memcmp(&u1, &u2, sizeof(uuid_le)); | |
54 | } | |
55 | ||
56 | static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2) | |
57 | { | |
58 | return memcmp(&u1, &u2, sizeof(uuid_be)); | |
59 | } | |
60 | ||
8da4b8c4 AS |
61 | void generate_random_uuid(unsigned char uuid[16]); |
62 | ||
fab1c232 HY |
63 | extern void uuid_le_gen(uuid_le *u); |
64 | extern void uuid_be_gen(uuid_be *u); | |
65 | ||
2b1b0d66 AS |
66 | bool __must_check uuid_is_valid(const char *uuid); |
67 | ||
68 | extern const u8 uuid_le_index[16]; | |
69 | extern const u8 uuid_be_index[16]; | |
70 | ||
71 | int uuid_le_to_bin(const char *uuid, uuid_le *u); | |
72 | int uuid_be_to_bin(const char *uuid, uuid_be *u); | |
73 | ||
fab1c232 | 74 | #endif |