netdev - Re: [PATCH net-next] sockopt: Introduce the SO

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Message-Id: <20121023.133602.1844873902881466397.davem@davemloft.net>
Date:	Tue, 23 Oct 2012 13:36:02 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	xemul@...allels.com
Cc:	brian.haley@...com, bhutchings@...arflare.com,
	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] sockopt: Introduce the SO_BINDTOIFINDEX

This is really a huge ball of confusion.

The user asks for a device to bind to, and they want the device which
had a particular name at the time of the call.

If you allow setting this via ifindex, the issues and races are the
same whether the name-->ifindex translation is done before the
sockopt() call or during it.

Furthermore both the name and the ifindex can change (that latter
via module unload/load).

If you want me to consider these changes seriously, talk less about
obtuse issues like symmetry and more about what problems it actually
solves.  As far as I can tell, all the same real issues still exist
even if we had this new interface.

In fact, I wouldn't mind if a getsockopt() on SO_BINDTODEVICE returned
BOTH the name and the ifindex in a special structure.  Then you could
actually construct a more foolproof mechanism on the user side to try
various ways to get the same device bound to during restart.

Symmetry is over-rated.
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