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

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Date:   Wed, 20 Oct 2021 18:06:05 -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>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH bpf-next 10/10] bpf: Add sample for raw syncookie helpers

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.

> +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB

Isn't it deprecated?
LICENSES/deprecated/Linux-OpenIB

> +	// Don't combine additions to avoid 32-bit overflow.

c++ style comment?
did you run checkpatch?