From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: libmnl limitation...
Date: Sun, 20 Feb 2011 13:41:28 -0800 (PST)
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Unfortunately, libmnl only allows setting socket options
that are of SOL_NETLINK.

This precludes setting socket options such as SO_ATTACH_FILTER
which need to be of level SOL_SOCKET.

It seems to be a mistake to have hard-coded the socket level
instead of simply letting the user specify it :-/