netdev - dynamically allocated dst

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Message-ID: <20081030042241.GA15999@x200.localdomain>
Date:	Thu, 30 Oct 2008 07:22:41 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	netdev@...r.kernel.org, containers@...r.kernel.org
Subject: dynamically allocated dst_ops

They are bogus and should be implanted into struct net directly.
In garbage collector hook, just use container_of() (once) to get struct net.
->dst_net is useless after that.

I'm going to use this trick for xfrm.

And if someone has ideas on how to overcome header difficulties, please,
submit a patch.
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