linux-kernel - Re: [PATCH] samples/bpf: Add sample usage for BPF_PROG_TYPE

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Message-ID: <CAADnVQJVyQQ5geDuUgoDYygN9R1gJr-21XmQOR8gY5UkZsosCQ@mail.gmail.com>
Date:   Mon, 4 Sep 2023 14:01:14 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     David Wang <00107082@....com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] samples/bpf: Add sample usage for BPF_PROG_TYPE_NETFILTER

On Mon, Sep 4, 2023 at 3:49 AM Florian Westphal <fw@...len.de> wrote:
>
> David Wang <00107082@....com> wrote:
> > This sample code implements a simple ipv4
> > blacklist via the new bpf type BPF_PROG_TYPE_NETFILTER,
> > which was introduced in 6.4.
> >
> > The bpf program drops package if destination ip address
> > hits a match in the map of type BPF_MAP_TYPE_LPM_TRIE,
> >
> > The userspace code would load the bpf program,
> > attach it to netfilter's FORWARD/OUTPUT hook,
> > and then write ip patterns into the bpf map.
>
> Thanks, I think its good to have this.

Yes, but only in selftests/bpf.
samples/bpf/ are not tested and bit rot heavily.