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.
(Jambunathan sorry about replying directly to you..here is message to list)
Here is a reasonably good 'walk through'. It's ever so slightly inaccurate in some of the example code with redundant #includes, but is pretty good as a starting point. It really should 'This is how *I* did it', as there are several ways to acheive same thing...
http://www.tldp.org/HOWTO/Querying-libiptc-HOWTO/index.html
BTW, the libiptc isn't meant to be used as an 'API' to manipulate tables etc. Several reasons are given see http://netfilter.org/documentation/FAQ/netfilter-faq-4.html#ss4.5
Cheers, Michael
