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

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Date:   Thu, 21 Oct 2021 11:50:24 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
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>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH bpf-next 10/10] bpf: Add sample for raw syncookie helpers

On Thu, Oct 21, 2021 at 10:31 AM Maxim Mikityanskiy <maximmi@...dia.com> wrote:
>
> On 2021-10-21 04:06, Alexei Starovoitov wrote:
> > On Tue, Oct 19, 2021 at 05:46:55PM +0300, Maxim Mikityanskiy wrote:
> >> This commit adds a sample for the new BPF helpers: bpf_ct_lookup_tcp,
> >> bpf_tcp_raw_gen_syncookie and bpf_tcp_raw_check_syncookie.
> >>
> >> samples/bpf/syncookie_kern.c is a BPF program that generates SYN cookies
> >> on allowed TCP ports and sends SYNACKs to clients, accelerating synproxy
> >> iptables module.
> >>
> >> samples/bpf/syncookie_user.c is a userspace control application that
> >> allows to configure the following options in runtime: list of allowed
> >> ports, MSS, window scale, TTL.
> >>
> >> samples/bpf/syncookie_test.sh is a script that demonstrates the setup of
> >> synproxy with XDP acceleration.
> >>
> >> Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
> >> Reviewed-by: Tariq Toukan <tariqt@...dia.com>
> >> ---
> >>   samples/bpf/.gitignore        |   1 +
> >>   samples/bpf/Makefile          |   3 +
> >>   samples/bpf/syncookie_kern.c  | 591 ++++++++++++++++++++++++++++++++++
> >>   samples/bpf/syncookie_test.sh |  55 ++++
> >>   samples/bpf/syncookie_user.c  | 388 ++++++++++++++++++++++
> >>   5 files changed, 1038 insertions(+)
> >>   create mode 100644 samples/bpf/syncookie_kern.c
> >>   create mode 100755 samples/bpf/syncookie_test.sh
> >>   create mode 100644 samples/bpf/syncookie_user.c
> >
> > Tests should be in selftests/bpf.
> > Samples are for samples only.
>
> It's not a test, please don't be confused by the name of
> syncookie_test.sh - it's more like a demo script.
>
> syncookie_user.c and syncookie_kern.c are 100% a sample, they show how
> to use the new helpers and are themselves a more or less
> feature-complete solution to protect from SYN flood. syncookie_test.sh
> should probably be named syncookie_demo.sh, it demonstrates how to bring
> pieces together.
>
> These files aren't aimed to be a unit test for the new helpers, their
> purpose is to show the usage.

Please convert it to a selftest.
Sooner or later we will convert all samples/bpf into tests and delete that dir.