1 files changed, 65 insertions, 0 deletions
diff --git a/lib/uuid.c b/lib/uuid.c
index 6c81c0b0467e..82787f652fbc 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -19,10 +19,17 @@
  */
 
 #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
  *
@@ -65,3 +72,61 @@ 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);