netdev - Re: [PATCH net] bpf: expose netns inode to bpf programs

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Date:   Fri, 3 Feb 2017 15:08:32 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Alexei Starovoitov <ast@...com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Ahern <dsa@...ulusnetworks.com>,
        Tejun Heo <tj@...nel.org>, Thomas Graf <tgraf@...g.ch>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net] bpf: expose netns inode to bpf programs

On Fri, Feb 03, 2017 at 01:00:47PM -0800, Andy Lutomirski wrote:
> 
> ISTM any ability to migrate namespaces and to migrate eBPF programs
> that know about namespaces needs to have the eBPF program firmly
> rooted in some namespace (or perhaps cgroup in this case) so that it

programs are already global. We cannot break that.

> can see a namespaced view of the world.  For this to work, presumably
> we need to make sure that eBPF programs that are installed by programs
> that are in a container don't see traffic that isn't in that
> container.

such approach will break existing users.