Commit 35d5a374 authored by Alexander Aring's avatar Alexander Aring Committed by Marcel Holtmann
Browse files

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: default avatarAlexander Aring <alex.aring@gmail.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 1906bbbd

include/linux/ieee802154.h

+14 −0
Original line number Diff line number Diff line
@@ -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 */