netdev - Re: [PATCH bpf-next 10/10] bpf: Add sample for raw syncookie helpers

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Date:   Wed, 20 Oct 2021 11:01:01 -0700
From:   Joe Stringer <joe@...ium.io>
To:     Maxim Mikityanskiy <maximmi@...dia.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Brendan Jackman <jackmanb@...gle.com>,
        Florent Revest <revest@...omium.org>,
        Joe Stringer <joe@...ium.io>,
        Lorenz Bauer <lmb@...udflare.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH bpf-next 10/10] bpf: Add sample for raw syncookie helpers

Hi,  just one comment related to the discussion on patch 7.

On Tue, Oct 19, 2021 at 7:49 AM Maxim Mikityanskiy <maximmi@...dia.com> wrote:

<snip>

> +
> +       value = 0; // Flags.
> +       ct = bpf_ct_lookup_tcp(ctx, &tup, tup_size, BPF_F_CURRENT_NETNS, &value);
> +       if (ct) {
> +               unsigned long status = ct->status;
> +
> +               bpf_ct_release(ct);
> +               if (status & IPS_CONFIRMED_BIT)
> +                       return XDP_PASS;
> +       } else if (value != -ENOENT) {
> +               return XDP_ABORTED;
> +       }

Is this the only reason that you wish to expose conntrack lookup
functions to the API?

You should be able to find out whether the TCP session is established
by doing a TCP socket lookup and checking sk->state.