Re: [PATCH] samples/bpf: Add sample usage for BPF_PROG_TYPE_NETFILTER

[Alexei Starovoitov]

On Mon, Sep 4, 2023 at 3:49 AM Florian Westphal <fw@xxxxxxxxx> wrote:
>
> David Wang <00107082@xxxxxxx> 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.