Hi,

I've ported the conntrack event notification API[1] to nf_conntrack. 
Anyway, I'll try to keep a updated version for ip_conntrack (which won't 
be ever merged into the mainline) since it's useful for Krisztian 
Kovacs' ct_sync works.

Expect more patches that port my lastest posted stuff to nf_conntrack soon.

References:
[1] 
https://lists.netfilter.org/pipermail/netfilter-devel/2004-November/017453.html

--
Pablo