From: Pierre Ynard <linkfanel@yahoo.fr>
Date: Tue, 13 Nov 2007 01:54:13 +0100

quoted text
> Userland neighbor discovery options are typically heavily involved with
> the interface on which thay are received: add a missing ifindex field to
> the original struct. Thanks to Rémi Denis-Courmont.
> 
> Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr>

Unfortunately you cannot change the layout of a structure
already exported to userspace, it is part of the ABI.

You'll need to create a new netlink attribute or similar
in order to provide this information.
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