From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexey Dobriyan <adobriyan@gmail.com>
Subject: dynamically allocated dst_ops
Date: Thu, 30 Oct 2008 07:22:41 +0300
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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.