linux-kernel - Re: [PATCH net-next] sysfs: add entry to indicate network interfaces with random MAC address

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Message-Id: <20100720.142045.32697196.davem@davemloft.net>
Date:	Tue, 20 Jul 2010 14:20:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	bhutchings@...arflare.com, sassmann@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	gospo@...hat.com, gregory.v.rose@...el.com,
	alexander.h.duyck@...el.com, leedom@...lsio.com, harald@...hat.com
Subject: Re: [PATCH net-next] sysfs: add entry to indicate network
 interfaces with random MAC address

From: Stephen Hemminger <shemminger@...tta.com>
Date: Tue, 20 Jul 2010 14:18:16 -0700

> No one mentioned that the first octet of an Ethernet address already
> indicates "software generated" Ethernet address. Per the standard,
> if bit 1 is set it means address is locally assigned.
> 
> static inline bool is_locally_assigned_ether(const u8 *addr)
> {
> 	return (addr[0] & 0x2) != 0;
> }

W00t!

Indeed, can udev just use that?  :-)
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