netdev - Re: [PATCH bpf-next v3 06/12] bpf, sockmap: Don't set up sockmap progs for listening sockets

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Date:   Wed, 22 Jan 2020 16:24:36 +0000
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Martin Lau <kafai@...com>
Subject: Re: [PATCH bpf-next v3 06/12] bpf, sockmap: Don't set up sockmap
 progs for listening sockets

On Wed, 22 Jan 2020 at 13:06, Jakub Sitnicki <jakub@...udflare.com> wrote:
> @@ -352,7 +376,15 @@ static int sock_map_update_common(struct bpf_map *map, u32 idx,
>         if (!link)
>                 return -ENOMEM;
>
> -       ret = sock_map_link(map, &stab->progs, sk);
> +       /* Only established or almost established sockets leaving
> +        * SYN_RECV state need to hold refs to parser/verdict progs
> +        * and have their sk_data_ready and sk_write_space callbacks
> +        * overridden.
> +        */
> +       if (sk->sk_state == TCP_LISTEN)
> +               ret = sock_map_link_no_progs(map, sk);
> +       else
> +               ret = sock_map_link(map, &stab->progs, sk);

Could you use sock_map_redirect_okay from the previous patch here
instead of checking for TCP_LISTEN?

-- 
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

www.cloudflare.com