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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>
This commit is contained in:
Alexander Aring 2014-11-05 20:51:22 +01:00 committed by Marcel Holtmann
parent 1906bbbddb
commit 35d5a374a5
1 changed files with 14 additions and 0 deletions
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14
include/linux/ieee802154.h
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@ -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 */