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From: Patrick McHardy <kaber@trash.net>
To: Pablo Neira <pablo@eurodev.net>
Cc: Gervasio Bernal <gervasiobernal@speedy.com.ar>,
	netfilter-devel@lists.netfilter.org
Subject: Re: New target: can't delete rule
Date: Thu, 08 Sep 2005 00:34:52 +0200	[thread overview]
Message-ID: <431F6B0C.7070303@trash.net> (raw)
In-Reply-To: <431F6A0E.1090707@eurodev.net>

Pablo Neira wrote:
> I bet that you have a pointer in the private info section of the target.
> See that iptables sets that pointer to NULL at rule creation.
> Afterwards, once checkentry() is called, such pointer won't be NULL
> anymore.
> 
> At removal, the rule built by iptables sets that pointer to NULL. Such
> rule will be compared with the ruleset hold in kernel space but no
> matches will be found since the pointers mismatch.
> 
> This problem is well known and it's very easy to fix up (look for
> userspacesize and offsetof in iptables/extensions). See ipt_limit,
> ipt_CLUSTERIP...

Thanks, I didn't know about this problem. We should really focus on
a netlink interface to iptables once nf_conntrack is in, even without
pkttables.

  reply	other threads:[~2005-09-07 22:34 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-07 18:09 New target: can't delete rule Gervasio Bernal
2005-09-07 22:30 ` Pablo Neira
2005-09-07 22:34   ` Patrick McHardy [this message]
2005-09-07 23:58     ` Pablo Neira
2005-09-12 19:23   ` Gervasio Bernal
2005-09-12 23:24     ` Pablo Neira
2005-09-12 20:45       ` Gervasio Bernal

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