I am interested in knowing the netfilter infrastructure and I would like to know how iptables communicates with netfilter ( user to kernel space communication ) I understand that it happens through raw sockets through setsockot and getsockopt. Also there are a good number of iptc_* calls that are declared in libiptc.h which are used by the iptables user space tool. I would like to know where I can see the implementations for these iptc_* calls. I am unable to see this either in the kernel code nor in the iptables bz2 package. I am looking at 2.4.18 code of linux kernel fyi. I will appreciate a mini code walk through or example. Regards, Jambunathan K.
