netdev - Re: [PATCH v7 0/6] Add eBPF hooks for cgroups

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Date:   Fri, 28 Oct 2016 09:00:51 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Daniel Mack <daniel@...que.org>, htejun@...com,
        daniel@...earbox.net, ast@...com, davem@...emloft.net,
        kafai@...com, fw@...len.de, harald@...hat.com,
        netdev@...r.kernel.org, sargun@...gun.me, cgroups@...r.kernel.org
Subject: Re: [PATCH v7 0/6] Add eBPF hooks for cgroups

On 10/28/16 5:28 AM, Pablo Neira Ayuso wrote:
> I saw those, I would really like to have a closer look at David
> Ahern's usecase since that skb iif mangling looks kludgy to me, and
> given this is exposing a new helper for general use, not only vrf, it
> would be good to make sure helpers provide something useful for
> everyone. So that new helper is questionable at this stage IMO. I'm
> concerned that people may start using bpf as the adhesive tape to glue
> things to solve probably design problems.

It's changing sk_bound_dev_if on a socket when the socket is created, not skb iif. I explain the need in the cover letter. I have also explained the use case in the other attempts to solve this problem -- a stand alone l3mdev cgroup and adding a default setting to the task struct.