ieee802154: add ieee802154_random_extended_addr

This patch adds a new function to generate a random IEEE 802.15.4
extended address.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/ieee802154.h b/include/linux/ieee802154.h
index a907fe59b1d1..d043449a079d 100644
--- a/include/linux/ieee802154.h
+++ b/include/linux/ieee802154.h
@@ -24,6 +24,7 @@
 #define LINUX_IEEE802154_H
 
 #include <linux/types.h>
+#include <linux/random.h>
 #include <asm/byteorder.h>
 
 #define IEEE802154_MTU                  127
@@ -215,4 +216,17 @@ static inline bool ieee802154_is_valid_extended_addr(const __le64 addr)
                 (addr != cpu_to_le64(0xffffffffffffffffULL)));
 }
 
+/**
+ * ieee802154_random_extended_addr - generates a random extended address
+ * @addr: extended addr pointer to place the random address
+ */
+static inline void ieee802154_random_extended_addr(__le64 *addr)
+{
+        get_random_bytes(addr, IEEE802154_EXTENDED_ADDR_LEN);
+
+        /* toggle some bit if we hit an invalid extended addr */
+        if (!ieee802154_is_valid_extended_addr(*addr))
+                ((u8 *)addr)[IEEE802154_EXTENDED_ADDR_LEN - 1] ^= 0x01;
+}
+
 #endif /* LINUX_IEEE802154_H */