[PATCH 1/3] introduce helper to generate mac address with OUI

[Jean-Christophe PLAGNIOL-VILLARD]

use random mac address with fixed OUI provided

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 include/local_mac_address.h | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 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 0000000..3920334
--- /dev/null
+++ b/include/local_mac_address.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnio at jcrosoft.com>
+ *
+ * Under GPLv2 only
+ */
+
+#ifndef __LOCAL_MAC_ADDRESS_H__
+#define __LOCAL_MAC_ADDRESS_H__
+
+/**
+ * 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__ */
-- 
1.8.4.rc1