[syslog-ng]logging source: netlink socket ?

I am a new syslog-ng user and am very happy with it. But last I found the first thing which I wanted to do and was not able :) Could be possible to log the iptables ULOG target... with that packet filter logging without trashing dmesg could be done. And it had probably many other applications, too :) I did not found anything with netlink sockets in the 1.6.4 source. My primary goal was to know if I missed something? thanks, MaXX