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 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 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 81 guid_copy(guid_t *dst, const guid_t *src) 82 { 83 memcpy(dst, src, sizeof(*dst)); 84 } 85 86 static inline void 87 import_guid(guid_t *dst, const uint8_t *src) 88 { 89 memcpy(dst, src, sizeof(guid_t)); 90 } 91 92 static inline void 93 export_guid(uint8_t *dst, const guid_t *src) 94 { 95 memcpy(dst, src, sizeof(guid_t)); 96 } 97 98 static inline bool 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