Messages in this thread |  | | | Date | Sun, 17 Feb 2008 23:33:30 -0800 (PST) | | Subject | Re: [PATCH 1/3] Support arbitrary initial TCP timestamps | | From | David Miller <> |
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From: Glenn Griffin <ggriffin.kernel@gmail.com> Date: Fri, 15 Feb 2008 09:47:08 -0800
> Introduce the ability to send arbitrary initial tcp timestamps that are not > tied directly to jiffies. The basic conecpt is every tcp_request_sock and > tcp_sock now has a ts_off offset that represents the difference between > tcp_time_stamp and the timestamp we send and expect to > receive. > > This has the advantage of not divulging system information (uptime) > depending on the policy chosen for the initial timestamps. > > A policy where ts_off is always set to zero should produce no change in > behavior. The policy implemented is not intended for real use, but just as > a simple example. A realistic example would probably be similar to the tcp > init sequence generator. > > Signed-off-by: Glenn Griffin <ggriffin.kernel@gmail.com>
Adding yet another member to the already bloated tcp_sock structure to implement this is too high a cost.
I would instead prefer that there be some global random number calculated when the first TCP socket is created, and use that as a global offset. You can even recompute it every few hours if you like.
We do similar things already elsewhere.
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