linux-kernel - Re: [PATCH v4 7/7] net/tcp: Don't store TCP-AO maclen on reqsk

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Message-ID: <CANn89iKHXv_eNgc0525r=RAREqNXenf+StMHzK2=K_uKj-N4rQ@mail.gmail.com>
Date:   Wed, 29 Nov 2023 19:10:45 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     David Ahern <dsahern@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        Simon Horman <horms@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH v4 7/7] net/tcp: Don't store TCP-AO maclen on reqsk

On Wed, Nov 29, 2023 at 5:57 PM Dmitry Safonov <dima@...sta.com> wrote:
>
> This extra check doesn't work for a handshake when SYN segment has
> (current_key.maclen != rnext_key.maclen). It could be amended to
> preserve rnext_key.maclen instead of current_key.maclen, but that
> requires a lookup on listen socket.
>
> Originally, this extra maclen check was introduced just because it was
> cheap. Drop it and convert tcp_request_sock::maclen into boolean
> tcp_request_sock::used_tcp_ao.
>
> Fixes: 06b22ef29591 ("net/tcp: Wire TCP-AO to request sockets")
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
>

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