linux-kernel - Re: [PATCH net v2 0/2] tcp: restrict crossed SYN specific actions to SYN-ACK

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Message-ID: <a2f181c3-92d7-4874-b402-50a54b6d289c@redhat.com>
Date: Tue, 23 Jul 2024 10:10:15 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>,
 Neal Cardwell <ncardwell@...gle.com>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Jerry Chu <hkchu@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, David Ahern <dsahern@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>,
 Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [PATCH net v2 0/2] tcp: restrict crossed SYN specific actions to
 SYN-ACK

On 7/18/24 12:33, Matthieu Baerts (NGI0) wrote:
> A recent commit in TCP affects TFO and MPTCP in some cases. The first
> patch fixes that.
> 
> The second one applies the same fix to another crossed SYN specific
> action just before.
> 
> These two fixes simply restrict what should be done only for crossed SYN
> cases to packets with SYN-ACK flags.
> 
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
> ---
> Changes in v2:
> - Patch 1/2 has a simpler and generic check (Kuniyuki), and an updated
>    comment.
> - New patch 2/2: a related fix
> - Link to v1: https://lore.kernel.org/r/20240716-upstream-net-next-20240716-tcp-3rd-ack-consume-sk_socket-v1-1-4e61d0b79233@kernel.org

Re-adding Neal for awareness. It would be great if this could go through 
some packetdrill testing,

Thanks!

Paolo