netdev - Re: [PATCH nf-next] netfilter: xt_socket: add XT_SOCKET

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Message-ID: <20130604111014.73c718f7@redhat.com>
Date:	Tue, 4 Jun 2013 11:10:14 +0200
From:	Jesper Dangaard Brouer <jbrouer@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	netdev <netdev@...r.kernel.org>, netfilter-devel@...r.kernel.org,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH nf-next] netfilter: xt_socket: add XT_SOCKET_NOWILDCARD
 flag

On Mon, 03 Jun 2013 15:57:29 -0700
Eric Dumazet <eric.dumazet@...il.com> wrote:

> From: Eric Dumazet <edumazet@...gle.com>
> 
> xt_socket module can be a nice replacement to conntrack module
> in some cases (SYN filtering for example)
> 
> But it lacks the ability to match the 3rd packet of TCP
> handshake (ACK coming from the client).
> 
> Add a XT_SOCKET_NOWILDCARD flag to disable the wildcard mechanism

Sorry, but I'm not sure I understand your description.

What is the effect of adding the XT_SOCKET_NOWILDCARD flag?
It almost sound like it adds the ability to match the 3rd packet of TCP
handshake (ACK coming from the client), is that the case?

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer
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