netdev - Re: [PATCH v2 net] bpf: add bpf_sk_netns

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Message-ID: <20170205032548.GE73775@ast-mbp.thefacebook.com>
Date:   Sat, 4 Feb 2017 19:25:49 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Alexei Starovoitov <ast@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Ahern <dsa@...ulusnetworks.com>,
        Tejun Heo <tj@...nel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net] bpf: add bpf_sk_netns_id() helper

On Sat, Feb 04, 2017 at 09:15:10AM -0800, Andy Lutomirski wrote:
> On Fri, Feb 3, 2017 at 5:22 PM, Alexei Starovoitov <ast@...com> wrote:
> > Note that all bpf programs types are global.
> 
> I don't think this has a clear enough meaning to work with.  In

Please clarify what you mean. The quoted part says
"bpf programs are global". What is not "clear enough" there?

> I think that this patch plus a minor change to prevent installing
> cgroup+bpf programs if the installer isn't in the init netns + fs ns
> would work because it would allow new, migratable semantics to be
> added down the road to relax the restriction.

Forcing installer to be in init netns is not acceptable to David
who added cgroup_sock in the first place. I'm not sure why
we have to discuss that bit in circles.