netdev - Re: [PATCH bpf-next 00/10] bpf

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Date:   Fri, 24 Apr 2020 08:54:02 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 00/10] bpf_link observability APIs

On Fri, Apr 24, 2020 at 4:40 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> Andrii Nakryiko <andriin@...com> writes:
>
> > This patch series adds various observability APIs to bpf_link:
> >   - each bpf_link now gets ID, similar to bpf_map and bpf_prog, by which
> >     user-space can iterate over all existing bpf_links and create limited FD
> >     from ID;
> >   - allows to get extra object information with bpf_link general and
> >     type-specific information;
> >   - implements `bpf link show` command which lists all active bpf_links in the
> >     system;
> >   - implements `bpf link pin` allowing to pin bpf_link by ID or from other
> >     pinned path.
> >
> > rfc->v1:
> >   - dropped read-only bpf_links (Alexei);
>
> Just to make sure I understand this right: With this change, the
> GET_FD_BY_ID operation will always return a r/w bpf_link fd that can
> subsequently be used to detach the link? And you're doing the 'access
> limiting' by just requiring CAP_SYS_ADMIN for the whole thing. Right? :)

Right.

>
> -Toke
>