summaryrefslogtreecommitdiff
path: root/lib/uuid.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/uuid.c')
-rw-r--r--lib/uuid.c91
1 files changed, 86 insertions, 5 deletions
diff --git a/lib/uuid.c b/lib/uuid.c
index 398821e4d..37687af77 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -1,7 +1,7 @@
/*
* Unified UUID/GUID definition
*
- * Copyright (C) 2009, Intel Corp.
+ * Copyright (C) 2009, 2016 Intel Corp.
* Huang Ying <ying.huang@intel.com>
*
* This program is free software; you can redistribute it and/or
@@ -12,17 +12,40 @@
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/errno.h>
#include <linux/export.h>
#include <linux/uuid.h>
#include <linux/random.h>
+const u8 uuid_le_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
+EXPORT_SYMBOL(uuid_le_index);
+const u8 uuid_be_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+EXPORT_SYMBOL(uuid_be_index);
+
+/***************************************************************
+ * Random UUID interface
+ *
+ * Used here for a Boot ID, but can be useful for other kernel
+ * drivers.
+ ***************************************************************/
+
+/*
+ * Generate random UUID
+ */
+void generate_random_uuid(unsigned char uuid[16])
+{
+ get_random_bytes(uuid, 16);
+ /* Set UUID version to 4 --- truly random generation */
+ uuid[6] = (uuid[6] & 0x0F) | 0x40;
+ /* Set the UUID variant to DCE */
+ uuid[8] = (uuid[8] & 0x3F) | 0x80;
+}
+EXPORT_SYMBOL(generate_random_uuid);
+
static void __uuid_gen_common(__u8 b[16])
{
prandom_bytes(b, 16);
@@ -45,3 +68,61 @@ void uuid_be_gen(uuid_be *bu)
bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
}
EXPORT_SYMBOL_GPL(uuid_be_gen);
+
+/**
+ * uuid_is_valid - checks if UUID string valid
+ * @uuid: UUID string to check
+ *
+ * Description:
+ * It checks if the UUID string is following the format:
+ * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+ * where x is a hex digit.
+ *
+ * Return: true if input is valid UUID string.
+ */
+bool uuid_is_valid(const char *uuid)
+{
+ unsigned int i;
+
+ for (i = 0; i < UUID_STRING_LEN; i++) {
+ if (i == 8 || i == 13 || i == 18 || i == 23) {
+ if (uuid[i] != '-')
+ return false;
+ } else if (!isxdigit(uuid[i])) {
+ return false;
+ }
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(uuid_is_valid);
+
+static int __uuid_to_bin(const char *uuid, __u8 b[16], const u8 ei[16])
+{
+ static const u8 si[16] = {0,2,4,6,9,11,14,16,19,21,24,26,28,30,32,34};
+ unsigned int i;
+
+ if (!uuid_is_valid(uuid))
+ return -EINVAL;
+
+ for (i = 0; i < 16; i++) {
+ int hi = hex_to_bin(uuid[si[i] + 0]);
+ int lo = hex_to_bin(uuid[si[i] + 1]);
+
+ b[ei[i]] = (hi << 4) | lo;
+ }
+
+ return 0;
+}
+
+int uuid_le_to_bin(const char *uuid, uuid_le *u)
+{
+ return __uuid_to_bin(uuid, u->b, uuid_le_index);
+}
+EXPORT_SYMBOL(uuid_le_to_bin);
+
+int uuid_be_to_bin(const char *uuid, uuid_be *u)
+{
+ return __uuid_to_bin(uuid, u->b, uuid_be_index);
+}
+EXPORT_SYMBOL(uuid_be_to_bin);