From: Alexander Aring <alex.aring@gmail.com>
Date: Wed, 5 Nov 2014 19:51:22 +0000 (+0100)
Subject: ieee802154: add ieee802154_random_extended_addr
X-Git-Tag: v3.19-rc1~118^2~134^2~66^2~11
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=35d5a374a559a1ba9c6810739cf3ad1d672c2de2;p=~emulex%2Finfiniband.git

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>
---

diff --git a/include/linux/ieee802154.h b/include/linux/ieee802154.h
index a907fe59b1d..d043449a079 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 */