1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2011 Calxeda, Inc. 4 */ 5 6 #include <common.h> 7 #include <linux/ctype.h> 8 #include <errno.h> 9 #include <common.h> 10 #include <asm/io.h> 11 #include <part_efi.h> 12 #include <malloc.h> 13 14 /* 15 * UUID - Universally Unique IDentifier - 128 bits unique number. 16 * There are 5 versions and one variant of UUID defined by RFC4122 17 * specification. A UUID contains a set of fields. The set varies 18 * depending on the version of the UUID, as shown below: 19 * - time, MAC address(v1), 20 * - user ID(v2), 21 * - MD5 of name or URL(v3), 22 * - random data(v4), 23 * - SHA-1 of name or URL(v5), 24 * 25 * Layout of UUID: 26 * timestamp - 60-bit: time_low, time_mid, time_hi_and_version 27 * version - 4 bit (bit 4 through 7 of the time_hi_and_version) 28 * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low 29 * variant: - bit 6 and 7 of clock_seq_hi_and_reserved 30 * node - 48 bit 31 * 32 * source: https://www.ietf.org/rfc/rfc4122.txt 33 * 34 * UUID binary format (16 bytes): 35 * 36 * 4B-2B-2B-2B-6B (big endian - network byte order) 37 * 38 * UUID string is 36 length of characters (36 bytes): 39 * 40 * 0 9 14 19 24 41 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 42 * be be be be be 43 * 44 * where x is a hexadecimal character. Fields are separated by '-'s. 45 * When converting to a binary UUID, le means the field should be converted 46 * to little endian and be means it should be converted to big endian. 47 * 48 * UUID is also used as GUID (Globally Unique Identifier) with the same binary 49 * format but it differs in string format like below. 50 * 51 * GUID: 52 * 0 9 14 19 24 53 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 54 * le le le be be 55 * 56 * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id. 57 */ 58 int uuid_str_valid(const char *uuid) 59 { 60 int i, valid; 61 62 if (uuid == NULL) 63 return 0; 64 65 for (i = 0, valid = 1; uuid[i] && valid; i++) { 66 switch (i) { 67 case 8: case 13: case 18: case 23: 68 valid = (uuid[i] == '-'); 69 break; 70 default: 71 valid = isxdigit(uuid[i]); 72 break; 73 } 74 } 75 76 if (i != UUID_STR_LEN || !valid) 77 return 0; 78 79 return 1; 80 } 81 82 #ifdef CONFIG_PARTITION_TYPE_GUID 83 static const struct { 84 const char *string; 85 efi_guid_t guid; 86 } list_guid[] = { 87 {"system", PARTITION_SYSTEM_GUID}, 88 {"mbr", LEGACY_MBR_PARTITION_GUID}, 89 {"msft", PARTITION_MSFT_RESERVED_GUID}, 90 {"data", PARTITION_BASIC_DATA_GUID}, 91 {"linux", PARTITION_LINUX_FILE_SYSTEM_DATA_GUID}, 92 {"raid", PARTITION_LINUX_RAID_GUID}, 93 {"swap", PARTITION_LINUX_SWAP_GUID}, 94 {"lvm", PARTITION_LINUX_LVM_GUID} 95 }; 96 97 /* 98 * uuid_guid_get_bin() - this function get GUID bin for string 99 * 100 * @param guid_str - pointer to partition type string 101 * @param guid_bin - pointer to allocated array for big endian output [16B] 102 */ 103 int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin) 104 { 105 int i; 106 107 for (i = 0; i < ARRAY_SIZE(list_guid); i++) { 108 if (!strcmp(list_guid[i].string, guid_str)) { 109 memcpy(guid_bin, &list_guid[i].guid, 16); 110 return 0; 111 } 112 } 113 return -ENODEV; 114 } 115 116 /* 117 * uuid_guid_get_str() - this function get string for GUID. 118 * 119 * @param guid_bin - pointer to string with partition type guid [16B] 120 * @param guid_str - pointer to allocated partition type string [7B] 121 */ 122 int uuid_guid_get_str(unsigned char *guid_bin, char *guid_str) 123 { 124 int i; 125 126 *guid_str = 0; 127 for (i = 0; i < ARRAY_SIZE(list_guid); i++) { 128 if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) { 129 strcpy(guid_str, list_guid[i].string); 130 return 0; 131 } 132 } 133 return -ENODEV; 134 } 135 #endif 136 137 /* 138 * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data. 139 * 140 * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut 141 * @param uuid_bin - pointer to allocated array for big endian output [16B] 142 * @str_format - UUID string format: 0 - UUID; 1 - GUID 143 */ 144 int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format) 145 { 146 uint16_t tmp16; 147 uint32_t tmp32; 148 uint64_t tmp64; 149 150 if (!uuid_str_valid(uuid_str)) { 151 #ifdef CONFIG_PARTITION_TYPE_GUID 152 if (!uuid_guid_get_bin(uuid_str, uuid_bin)) 153 return 0; 154 #endif 155 return -EINVAL; 156 } 157 158 if (str_format == UUID_STR_FORMAT_STD) { 159 tmp32 = cpu_to_be32(simple_strtoul(uuid_str, NULL, 16)); 160 memcpy(uuid_bin, &tmp32, 4); 161 162 tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 9, NULL, 16)); 163 memcpy(uuid_bin + 4, &tmp16, 2); 164 165 tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 14, NULL, 16)); 166 memcpy(uuid_bin + 6, &tmp16, 2); 167 } else { 168 tmp32 = cpu_to_le32(simple_strtoul(uuid_str, NULL, 16)); 169 memcpy(uuid_bin, &tmp32, 4); 170 171 tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 9, NULL, 16)); 172 memcpy(uuid_bin + 4, &tmp16, 2); 173 174 tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 14, NULL, 16)); 175 memcpy(uuid_bin + 6, &tmp16, 2); 176 } 177 178 tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 19, NULL, 16)); 179 memcpy(uuid_bin + 8, &tmp16, 2); 180 181 tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16)); 182 memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6); 183 184 return 0; 185 } 186 187 /* 188 * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID. 189 * 190 * @param uuid_bin - pointer to binary data of UUID (big endian) [16B] 191 * @param uuid_str - pointer to allocated array for output string [37B] 192 * @str_format - UUID string format: 0 - UUID; 1 - GUID 193 */ 194 void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format) 195 { 196 const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 197 9, 10, 11, 12, 13, 14, 15}; 198 const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 199 9, 10, 11, 12, 13, 14, 15}; 200 const u8 *char_order; 201 int i; 202 203 /* 204 * UUID and GUID bin data - always in big endian: 205 * 4B-2B-2B-2B-6B 206 * be be be be be 207 */ 208 if (str_format == UUID_STR_FORMAT_STD) 209 char_order = uuid_char_order; 210 else 211 char_order = guid_char_order; 212 213 for (i = 0; i < 16; i++) { 214 sprintf(uuid_str, "%02x", uuid_bin[char_order[i]]); 215 uuid_str += 2; 216 switch (i) { 217 case 3: 218 case 5: 219 case 7: 220 case 9: 221 *uuid_str++ = '-'; 222 break; 223 } 224 } 225 } 226 227 /* 228 * gen_rand_uuid() - this function generates a random binary UUID version 4. 229 * In this version all fields beside 4 bits of version and 230 * 2 bits of variant are randomly generated. 231 * 232 * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian. 233 */ 234 #if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID) 235 void gen_rand_uuid(unsigned char *uuid_bin) 236 { 237 struct uuid uuid; 238 unsigned int *ptr = (unsigned int *)&uuid; 239 int i; 240 241 /* Set all fields randomly */ 242 for (i = 0; i < sizeof(struct uuid) / sizeof(*ptr); i++) 243 *(ptr + i) = cpu_to_be32(rand()); 244 245 clrsetbits_be16(&uuid.time_hi_and_version, 246 UUID_VERSION_MASK, 247 UUID_VERSION << UUID_VERSION_SHIFT); 248 249 clrsetbits_8(&uuid.clock_seq_hi_and_reserved, 250 UUID_VARIANT_MASK, 251 UUID_VARIANT << UUID_VARIANT_SHIFT); 252 253 memcpy(uuid_bin, &uuid, sizeof(struct uuid)); 254 } 255 256 /* 257 * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string 258 * formats UUID or GUID. 259 * 260 * @param uuid_str - pointer to allocated array [37B]. 261 * @param - uuid output type: UUID - 0, GUID - 1 262 */ 263 void gen_rand_uuid_str(char *uuid_str, int str_format) 264 { 265 unsigned char uuid_bin[UUID_BIN_LEN]; 266 267 /* Generate UUID (big endian) */ 268 gen_rand_uuid(uuid_bin); 269 270 /* Convert UUID bin to UUID or GUID formated STRING */ 271 uuid_bin_to_str(uuid_bin, uuid_str, str_format); 272 } 273 274 #ifdef CONFIG_CMD_UUID 275 int do_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 276 { 277 char uuid[UUID_STR_LEN + 1]; 278 int str_format; 279 280 if (!strcmp(argv[0], "uuid")) 281 str_format = UUID_STR_FORMAT_STD; 282 else 283 str_format = UUID_STR_FORMAT_GUID; 284 285 if (argc > 2) 286 return CMD_RET_USAGE; 287 288 gen_rand_uuid_str(uuid, str_format); 289 290 if (argc == 1) 291 printf("%s\n", uuid); 292 else 293 env_set(argv[1], uuid); 294 295 return CMD_RET_SUCCESS; 296 } 297 298 U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid, 299 "UUID - generate random Universally Unique Identifier", 300 "[<varname>]\n" 301 "Argument:\n" 302 "varname: for set result in a environment variable\n" 303 "e.g. uuid uuid_env" 304 ); 305 306 U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid, 307 "GUID - generate Globally Unique Identifier based on random UUID", 308 "[<varname>]\n" 309 "Argument:\n" 310 "varname: for set result in a environment variable\n" 311 "e.g. guid guid_env" 312 ); 313 #endif /* CONFIG_CMD_UUID */ 314 #endif /* CONFIG_RANDOM_UUID || CONFIG_CMD_UUID */ 315
