From: Patrick McHardy <kaber@trash.net>
To: "Björn Lindström" <bjorn.mailinglist@gmail.com>
Cc: netfilter-devel@lists.netfilter.org
Subject: Re: checking rule specifications in a match
Date: Tue, 20 Jun 2006 15:23:23 +0200 [thread overview]
Message-ID: <4497F6CB.4030600@trash.net> (raw)
In-Reply-To: <44966994.6020402@gmail.com>
Björn Lindström wrote:
> Hi.
> I am writing an iptables match to match the IEC-60870-5-104 protocol.
> I only want this match to be used on tcp packets and therefore I want
> iptables to reject rules if does not specify tcp as the protocol (-p
> tcp). I am currently doing this check in the checkentry function in the
> kernel module. This works but the error message only say "iptables:
> Unknown error 4294967295" if -p tcp is left out. Is it possible to do
> this check any other way to get a more comprehensible error message?
This is probably because you're using a broken version of iptables
userspace. Current kernels allow you to enforce a specific protocol
by setting the .proto field in struct xt_match, which will also handle
inversion correctly and logs a message to the ringbuffer on error.
prev parent reply other threads:[~2006-06-20 13:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-19 9:08 checking rule specifications in a match Björn Lindström
2006-06-20 13:23 ` Patrick McHardy [this message]
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