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

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Message-Id: <20100720.233457.267367495.davem@davemloft.net>
Date:	Tue, 20 Jul 2010 23:34:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	harald@...hat.com
Cc:	shemminger@...tta.com, 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
Subject: Re: [PATCH net-next] sysfs: add entry to indicate network
 interfaces with random MAC address

From: Harald Hoyer <harald@...hat.com>
Date: Wed, 21 Jul 2010 08:26:27 +0200

> On 07/20/2010 11:20 PM, David Miller wrote:
>> 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?  :-)
> 
> It already does:
> see /lib/udev/rules.d/75-persistent-net-generator.rules

So... why doesn't this work?
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