4 * Copyright (C) 2010, 2016 Intel Corp.
5 * Huang Ying <ying.huang@intel.com>
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;
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.
16 #ifndef _LINUX_UUID_H_
17 #define _LINUX_UUID_H_
19 #include <uapi/linux/uuid.h>
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
27 * - the clock sequence is a 14-bit counter to avoid duplicate times
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) */
46 * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
47 * not including trailing NUL.
49 #define UUID_STRING_LEN 36
51 static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
53 return memcmp(&u1, &u2, sizeof(uuid_le));
56 static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2)
58 return memcmp(&u1, &u2, sizeof(uuid_be));
61 void generate_random_uuid(unsigned char uuid[16]);
63 extern void uuid_le_gen(uuid_le *u);
64 extern void uuid_be_gen(uuid_be *u);
66 bool __must_check uuid_is_valid(const char *uuid);
68 extern const u8 uuid_le_index[16];
69 extern const u8 uuid_be_index[16];
71 int uuid_le_to_bin(const char *uuid, uuid_le *u);
72 int uuid_be_to_bin(const char *uuid, uuid_be *u);