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| author | Alexander Aring <alex.aring@gmail.com> | 2014-11-05 20:51:22 +0100 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2014-11-05 21:53:04 +0100 |
| commit | 35d5a374a559a1ba9c6810739cf3ad1d672c2de2 (patch) | |
| tree | fa9ae6bd39528a62f2d61cc63cc9f2b2a4b40f88 /include/linux/ieee802154.h | |
| parent | 1906bbbddbe085b19be2c21cd132335260f551c3 (diff) | |
| download | lwn-35d5a374a559a1ba9c6810739cf3ad1d672c2de2.tar.gz lwn-35d5a374a559a1ba9c6810739cf3ad1d672c2de2.zip | |
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>
Diffstat (limited to 'include/linux/ieee802154.h')
| -rw-r--r-- | include/linux/ieee802154.h | 14 |
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 */ |