netdev - Re: [PATCH iproute2 -next] tc, bpf: finalize eBPF support for cls and act front-end

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Message-Id: <1427934556.1892386.248333013.431CD73B@webmail.messagingengine.com>
Date:	Thu, 02 Apr 2015 02:29:16 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Daniel Borkmann <daniel@...earbox.net>, stephen@...workplumber.org
Cc:	ast@...mgrid.com, jiri@...nulli.us, tgraf@...g.ch,
	netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH iproute2 -next] tc,
 bpf: finalize eBPF support for cls and act front-end

Hey Daniel,

On Thu, Apr 2, 2015, at 02:24, Daniel Borkmann wrote:
> On 04/02/2015 02:13 AM, Hannes Frederic Sowa wrote:
> ...
> > Maybe a small utility programs like:
> >
> > bpf (--lookup|--update|--delete|--get-next-key) -fd
> > filedescriptor-number (type conversion parameters here) key [value]
> >
> > So it can be easily used by shell scripts.
> >
> > For that the filedescriptor numbers would need to be exported (already
> > opened) into a spawned shell and the numbers could be specified either
> > in environment or just by printing text which can be sourced by shells
> > (we already talked about the maybe exec 5</proc/pid/fd/1234 idea). Seems
> > this can be just build ontop this current patch by extending the
> > bpf-agent you already build, no?
> 
> I was thinking about that and trying it out, but as far as I can tell,
> due to the anon inodes that are currently underlying as the fd provider,
> it doesn't work w/o larger kernel changes. So, the file descriptor
> passing
> is currently the only way to transfer control.

Does receiving them via af_unix and spawning a new shell with the fds
already open work?

Bye,
Hannes
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