netdev - Re: [PATCH] net-ipv6: do not allow IPV6

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Message-ID: <CANn89iLc3pE49M+m5mk77kmdgGxSAjy_s-Lc8mqSt+ZdCmPJ0Q@mail.gmail.com>
Date:   Tue, 23 Nov 2021 14:52:27 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Maciej Żenczykowski <zenczykowski@...il.com>
Cc:     Maciej Żenczykowski <maze@...gle.com>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>, Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH] net-ipv6: do not allow IPV6_TCLASS to muck with tcp's ECN

On Tue, Nov 23, 2021 at 2:32 PM Maciej Żenczykowski
<zenczykowski@...il.com> wrote:
>
> From: Maciej Żenczykowski <maze@...gle.com>
>
> This is to match ipv4 behaviour, see __ip_sock_set_tos()
> implementation at ipv4/ip_sockglue.c:579
>
> void __ip_sock_set_tos(struct sock *sk, int val)
> {
>   if (sk->sk_type == SOCK_STREAM) {
>     val &= ~INET_ECN_MASK;
>     val |= inet_sk(sk)->tos & INET_ECN_MASK;
>   }
>   if (inet_sk(sk)->tos != val) {
>     inet_sk(sk)->tos = val;
>     sk->sk_priority = rt_tos2priority(val);
>     sk_dst_reset(sk);
>   }
> }
>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
>

This makes sense, thanks, even if INET_ECN_dontxmit() would eventually
catch up for non dctcp.

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