netdev - RE: [patch net-next] ipv6: allow userspace to create address with IFLA_F

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Date:	Tue, 29 Oct 2013 09:37:06 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"David Miller" <davem@...emloft.net>, <hannes@...essinduktion.org>
Cc:	<jiri@...nulli.us>, <vyasevich@...il.com>,
	<netdev@...r.kernel.org>, <kuznet@....inr.ac.ru>,
	<jmorris@...ei.org>, <yoshfuji@...ux-ipv6.org>, <kaber@...sh.net>,
	<thaller@...hat.com>, <stephen@...workplumber.org>
Subject: RE: [patch net-next] ipv6: allow userspace to create address with IFLA_F_TEMPORARY flag

> Note that you don't even need to put the DHCP protocol core into the
> kernel to fix the promiscuous problem.  You just have to use the
> current kernel interfaces correctly.
> 
> It used to be the case a very long time ago that you couldn't even
> receive broadcast UDP datagrams on a socket until an address was
> configured on it.
> 
> So everyone turns on promiscuous mode and uses RAW sockets or
> AF_PACKET.
> 
> Stupid?  yes.

Not only that, but the dhcp client could use a normal UDP socket
to keep the lease renewed - I suspect it has only ever needed
to use the BPF interface (I didn't think it set promiscuous)
when acquiring the initial lease.

	David
 


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