netdev - Re: [PATCH net-next 2/2] ebpf: add helper to retrieve net

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Message-ID: <55A6CB4E.1080307@plumgrid.com>
Date:	Wed, 15 Jul 2015 14:06:22 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net
Cc:	netdev@...r.kernel.org, Thomas Graf <tgraf@...g.ch>
Subject: Re: [PATCH net-next 2/2] ebpf: add helper to retrieve net_cls's
 classid cookie

On 7/15/15 5:21 AM, Daniel Borkmann wrote:
> It would be very useful to retrieve the net_cls's classid from an eBPF
> program to allow for a more fine-grained classification, it could be
> directly used or in conjunction with additional policies. I.e. docker,
> but also tooling such as cgexec, can easily run applications via net_cls
> cgroups:
>
>    cgcreate -g net_cls:/foo
>    echo 42 > foo/net_cls.classid
>    cgexec -g net_cls:foo <prog>
>
> Thus, their respecitve classid cookie of foo can then be looked up on
> the egress path to apply further policies. The helper is desigend such
> that a non-zero value returns the cgroup id.
>
> Signed-off-by: Daniel Borkmann<daniel@...earbox.net>
> Cc: Thomas Graf<tgraf@...g.ch>

looks good to me.
Acked-by: Alexei Starovoitov <ast@...mgrid.com>

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