This patch adds a new function to generate a random IEEE 802.15.4
extended address.
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
include/linux/ieee802154.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/linux/ieee802154.h b/include/linux/ieee802154.h
index a907fe5..d043449 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 */
--
2.1.3
--
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