From: Patrick McHardy <kaber@trash.net>
To: Eric Leblond <eric@inl.fr>, Curtis Wyatt <zhackwyatt@gmail.com>,
netfilter@vger.kernel.org
Subject: Re: ip_queue, libnetfilter_queue, and packet alteration
Date: Wed, 23 Jul 2008 19:13:47 +0200 [thread overview]
Message-ID: <488766CB.9060102@trash.net> (raw)
In-Reply-To: <20080723094512.GA2250@khasse.inl.fr>
Eric Leblond wrote:
> Hello,
>
> On Tuesday, 2008 July 22 at 17:02:14 -0700, Curtis Wyatt wrote:
>> I am using ip_queue. I understand that is depreciated.
>>
>> I want to intercept a packet, alter it (change payload and source ip
>> address and destination ip address) and then do an NF_ACCEPT on it, to
>> have it continue on its way to another machine. However it never
>> shows up at that other machine. Is there anyway to do this without
>> doing an NF_DROP and then sending a new packet through?
>>
>> Will libnetfilter_queue do this for me?
>
> Yes, but you will have to compute the checksum of the modified packet by
> yourself.
>
> Someone should send a patch which adds helper functions to ease that
> task in a day or two.
That makes sense. It would also allow to take advantage of hardware
TX csumming.
next prev parent reply other threads:[~2008-07-23 17:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-23 0:02 ip_queue, libnetfilter_queue, and packet alteration Curtis Wyatt
2008-07-23 9:45 ` Eric Leblond
2008-07-23 10:02 ` Pablo Neira Ayuso
2008-07-23 11:19 ` Eric Leblond
2008-07-23 16:43 ` Curtis Wyatt
2008-07-24 23:13 ` Curtis Wyatt
2008-07-23 17:13 ` Patrick McHardy [this message]
2008-07-24 7:41 ` Eric Leblond
2008-07-24 10:22 ` Patrick McHardy
2008-07-25 9:43 ` Sebastien Tricaud
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