netdev - Re: [PATCH] tcp: undo spurious timeout after SACK reneging

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 24 Mar 2013 16:50:41 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] tcp: undo spurious timeout after SACK reneging

On Sun, Mar 24, 2013 at 4:42 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> On SACK reneging the sender immediately retransmits and forces a
> timeout but disables Eifel (undo). If the (buggy) receiver does not
> drop any packet this can trigger a false slow-start retransmit storm
> driven by the ACKs of the original packets. This can be detected with
> undo and TCP timestamps.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---
>  net/ipv4/tcp_input.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html