I added ctnetlink support to a SIP proxy (siproxd) yesterday and
stumbled over some problems with NAT. The CTA_NAT attribute only
allows to set up a single manip, since NAT mappings can't be
changed for existing conntracks there is no way to add both a
src- and a dst-manip. This patch removes the overloading of the
status bits with netlink-relevant semantic and changes the CTA_NAT
attribute to CTA_NAT_SRC and CTA_NAT_DST. It breaks compatiblity,
but I don't think its worth trying to keep it for this stupid
behaviour. Any comments?