netdev - RE: [Patch bpf-next v7 12/13] sock_map: update sock type checks for UDP

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Date:   Mon, 29 Mar 2021 16:10:47 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, duanxiongchun@...edance.com,
        wangdongdong.6@...edance.com, jiang.wang@...edance.com,
        Cong Wang <cong.wang@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: RE: [Patch bpf-next v7 12/13] sock_map: update sock type checks for
 UDP

Cong Wang wrote:
> From: Cong Wang <cong.wang@...edance.com>
> 
> Now UDP supports sockmap and redirection, we can safely update
> the sock type checks for it accordingly.
> 
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Jakub Sitnicki <jakub@...udflare.com>
> Cc: Lorenz Bauer <lmb@...udflare.com>
> Signed-off-by: Cong Wang <cong.wang@...edance.com>
> ---
>  net/core/sock_map.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/core/sock_map.c b/net/core/sock_map.c
> index d04b98fc8104..9ed040c7d9e7 100644
> --- a/net/core/sock_map.c
> +++ b/net/core/sock_map.c
> @@ -549,7 +549,10 @@ static bool sk_is_udp(const struct sock *sk)
>  
>  static bool sock_map_redirect_allowed(const struct sock *sk)
>  {
> -	return sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN;
> +	if (sk_is_tcp(sk))
> +		return sk->sk_state != TCP_LISTEN;
> +	else
> +		return sk->sk_state == TCP_ESTABLISHED;
>  }
>  
>  static bool sock_map_sk_is_suitable(const struct sock *sk)
> -- 
> 2.25.1
> 

I think its a bit odd for TCP_ESTABLISHED to work with !tcp, but
thats not your invention so LGTM.

Acked-by: John Fastabend <john.fastabend@...il.com>