netdev - Re: [PATCH net] tcp: Initialize ca_priv when inheriting from listener

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Date:   Tue, 7 Jul 2020 21:51:03 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Christoph Paasch <cpaasch@...le.com>
Cc:     netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Wei Wang <weiwan@...gle.com>
Subject: Re: [PATCH net] tcp: Initialize ca_priv when inheriting from listener

On Tue, Jul 7, 2020 at 9:43 PM Eric Dumazet <edumazet@...gle.com> wrote:
>

> Could this be done instead in tcp_disconnect() ?
>

Note this might need to extend one of the change done in commit 4d4d3d1e8807d6
("[TCP]: Congestion control initialization.")

diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 3172e31987be4232af90e7b204742c5bb09ef6ca..62878cf26d9cc5c0ae44d5ecdadd0b7a5acf5365
100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -197,7 +197,7 @@ static void tcp_reinit_congestion_control(struct sock *sk,
        icsk->icsk_ca_setsockopt = 1;
        memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv));

-       if (sk->sk_state != TCP_CLOSE)
+       if (!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)))
                tcp_init_congestion_control(sk);
 }