iptc_* implementation queries

iptc_* implementation queries

[Jambunathan Jambunathan]

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.

Re: iptc_* implementation queries

[Kiran Kumar]

--- Jambunathan Jambunathan <kjambunathan@novell.com>
wrote:
> 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. 

  These are in the libiptc directory of the iptables
module of cvs.


=====
Regards,
Kiran Kumar Immidi

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Re: iptc_* implementation queries

[Michael Kearey]

Jambunathan Jambunathan wrote:
> 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

Re: iptc_* implementation queries

[Jambunathan Jambunathan]

Sorry if I am sounding stupid. Though I could see
the declarations in the 1.2.9 archive I am unable
to find the definition of iptc_* functions themselves.
Can you point me to the file that you are talking of ?

Please can someone give an hint on the user to kernel
space communication.

Regards,
Jambunathan K.

>>> Kiran Kumar <immidi_kiran@yahoo.com> 02/03/04 9:27 AM >>>
--- Jambunathan Jambunathan <kjambunathan@novell.com>
wrote:
> 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. 

  These are in the libiptc directory of the iptables
module of cvs.


=====
Regards,
Kiran Kumar Immidi

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