From: rigoberto perez <rigo666beast@yahoo.com>
To: netfilter <netfilter@vger.kernel.org>
Subject: Why the tcp ckecsum involves the skuff checksum?
Date: Thu, 11 Dec 2008 08:19:04 -0800 (PST) [thread overview]
Message-ID: <264657.32644.qm@web33208.mail.mud.yahoo.com> (raw)
Friends:
In Linux implementation of the TCP checksum the functions using the checksum of the skbuff. Theoretically the TCP pseudo header only contains the both IP directions, the protocol (6), 1 byte reserved full of zeros and the segment length. So, in what form is used the skbuff checksum in this computation?.
I suppose that the TCP level is not concern about netfilter modules. It's transparent. I mean, if I change the packet content in out direction and restore it in direction this change should be invisible to the uppers levels - including TCP level.
Thanks
reply other threads:[~2008-12-11 16:19 UTC|newest]
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