netdev - Re: [PATCH net v4 1/3] tcp: fix rejected syncookies due to stale timestamps

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Date:   Fri, 6 Dec 2019 17:49:51 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Guillaume Nault <gnault@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net v4 1/3] tcp: fix rejected syncookies due to stale
 timestamps



On 12/6/19 3:38 AM, Guillaume Nault wrote:
> If no synflood happens for a long enough period of time, then the
> synflood timestamp isn't refreshed and jiffies can advance so much
> that time_after32() can't accurately compare them any more.
...
> 
> Fixes: cca9bab1b72c ("tcp: use monotonic timestamps for PAWS")
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Guillaume Nault <gnault@...hat.com>

Signed-off-by: Eric Dumazet <edumazet@...gle.com>