1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2021,2023 The FreeBSD Foundation
5 *
6 * This software was developed by Björn Zeeb under sponsorship from
7 * the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifndef _LINUXKPI_LINUX_UUID_H
32 #define _LINUXKPI_LINUX_UUID_H
33
34 #include <linux/random.h>
35
36 #define UUID_SIZE 16
37 #define UUID_STRING_LEN 36
38
39 #define GUID_INIT(x0_3, x4_5, x6_7, x8, x9, x10, x11, x12, x13, x14, x15) \
40 ((guid_t) { .x = { \
41 [0] = (x0_3) & 0xff, \
42 [1] = ((x0_3) >> 8) & 0xff, \
43 [2] = ((x0_3) >> 16) & 0xff, \
44 [3] = ((x0_3) >> 24) & 0xff, \
45 [4] = (x4_5) & 0xff, \
46 [5] = ((x4_5) >> 8) & 0xff, \
47 [6] = (x6_7) & 0xff, \
48 [7] = ((x6_7) >> 8) & 0xff, \
49 [8] = (x8), \
50 [9] = (x9), \
51 [10] = (x10), \
52 [11] = (x11), \
53 [12] = (x12), \
54 [13] = (x13), \
55 [14] = (x14), \
56 [15] = (x15) \
57 }})
58
59 typedef struct {
60 char x[16];
61 } guid_t;
62
63 extern const guid_t guid_null;
64
65 static inline void
guid_gen(guid_t * g)66 guid_gen(guid_t *g)
67 {
68
69 get_random_bytes(g, 16);
70 g->x[7] = (g->x[7] & 0x0f) | 0x40;
71 g->x[8] = (g->x[8] & 0x3f) | 0x80;
72 }
73
74 static inline bool
guid_equal(const guid_t * u1,const guid_t * u2)75 guid_equal(const guid_t *u1, const guid_t *u2)
76 {
77 return (memcmp(u1, u2, sizeof(guid_t)) == 0);
78 }
79
80 static inline void
guid_copy(guid_t * dst,const guid_t * src)81 guid_copy(guid_t *dst, const guid_t *src)
82 {
83 memcpy(dst, src, sizeof(*dst));
84 }
85
86 static inline void
import_guid(guid_t * dst,const uint8_t * src)87 import_guid(guid_t *dst, const uint8_t *src)
88 {
89 memcpy(dst, src, sizeof(guid_t));
90 }
91
92 static inline void
export_guid(uint8_t * dst,const guid_t * src)93 export_guid(uint8_t *dst, const guid_t *src)
94 {
95 memcpy(dst, src, sizeof(guid_t));
96 }
97
98 static inline bool
guid_is_null(const guid_t * guid)99 guid_is_null(const guid_t *guid)
100 {
101 return (guid_equal(guid, &guid_null));
102 }
103
104 #endif /* _LINUXKPI_LINUX_UUID_H */
105