From 3293c860ab539de5e35bc29907ed7bd2cd1e5ad6 Mon Sep 17 00:00:00 2001 From: Jean-Christophe PLAGNIOL-VILLARD Date: Fri, 20 Sep 2013 07:47:43 +0200 Subject: [PATCH] introduce helper to generate mac address with OUI use random mac address with fixed OUI provided Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD Signed-off-by: Sascha Hauer --- include/local_mac_address.h | 42 +++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 include/local_mac_address.h diff --git a/include/local_mac_address.h b/include/local_mac_address.h new file mode 100644 index 000000000..3d1ec66b1 --- /dev/null +++ b/include/local_mac_address.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD + * + * Under GPLv2 only + */ + +#ifndef __LOCAL_MAC_ADDRESS_H__ +#define __LOCAL_MAC_ADDRESS_H__ + +#include + +/** + * local_mac_address_register - use random number with fix + * OUI provided device to provide an Ethernet address + * @ethid: ethernet device id + * @oui: Ethernet OUI (3 bytes) + * + * Generate a local Ethernet address (MAC) that is not multicast using a 1-wire id. + */ +static inline int local_mac_address_register(int ethid, char * oui) +{ + char addr[6]; + int nb_oui = 3; + int i; + + if (!oui) + return -EINVAL; + + random_ether_addr(addr); + + for (i = 0; i < nb_oui; i++) + addr[i] = oui[i]; + + addr[0] &= 0xfe; /* clear multicast bit */ + addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ + + eth_register_ethaddr(ethid, addr); + + return 0; +} + +#endif /* __LOCAL_MAC_ADDRESS_H__ */