Q about ip_conntrack_expect_related()/ip_nat_expect_register()

Q about ip_conntrack_expect_related()/ip_nat_expect_register()

[Peter 'Luna' Runestig]

Hi all!

I'm thinking of trying to put together a helper module, and I'm looking 
at existing code (plus reading howto's and searching the mbox archive) 
to try to grasp the way it all works.

I actually have two questions:

1) I'm looking at ip_{conntrack,nat}_irc.c (2.4.19). The help() function 
registered with ip_nat_helper_register(), seems to assume that the 
struct ip_conntrack *ct pointer passed, points to the same struct 
ip_conntrack that was modified in the conntrack help() function earlier. 
Why is that, what is the link between them? Just that the tuple/mask 
pair was identical in the ip_conntrack_helper_register() / 
ip_nat_helper_register() calls?

2) I also wonder why irc_nat_expected() is called at all! :-) Is it so, 
that every callback that is registered with ip_nat_expect_register(), is 
called for every connection that is "flagged" by 
ip_conntrack_expect_related() and is nat'ed in any way?

TIA,
- Peter
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Peter 'Luna' Runestig (fd. Altberg), Sweden <peter@runestig.com>
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Re: Q about ip_conntrack_expect_related()/ip_nat_expect_register()

[Harald Welte]

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On Wed, Oct 23, 2002 at 03:48:35PM +0200, Peter 'Luna' Runestig wrote:
> Hi all!
> 
> I'm thinking of trying to put together a helper module, and I'm looking 
> at existing code (plus reading howto's and searching the mbox archive) 
> to try to grasp the way it all works.
> 
> I actually have two questions:
> 
> 1) I'm looking at ip_{conntrack,nat}_irc.c (2.4.19). The help() function 

please don't look at 2.4.19 kernels, they predate the newnat changes.

Either look at 2.4.20-preX (where X > 2), or apply (at least) the newnat
patch from patch-o-matic.

The API has changed in both the issues you are questioning.

> TIA,
> - Peter
 

-- 
Live long and prosper
- Harald Welte / laforge@gnumonks.org               http://www.gnumonks.org/
============================================================================
"If this were a dictatorship, it'd be a heck of a lot easier, just so long
 as I'm the dictator."  --  George W. Bush Dec 18, 2000

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