netdev - Re: Possible to add netfilter hooks to IFB driver?

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Date:	Tue, 7 Jan 2014 11:18:07 +0000
From:	Alban Crequy <alban.crequy@...labora.co.uk>
To:	Andrew Collins <bsderandrew@...il.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	Brad Johnson <bjohnson@...ssa.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Possible to add netfilter hooks to IFB driver?

On Mon, 6 Jan 2014 15:51:37 -0700
Andrew Collins <bsderandrew@...il.com> wrote:

> On Mon, Jan 6, 2014 at 2:51 PM, Stephen Hemminger
> <stephen@...workplumber.org> wrote:
> >
> > The risk is creating the same races that made IMQ unacceptable.
> > --
> 
> I believe openwrt nowadays uses a TC action which runs the packet
> through prerouting then pulls in the mark off the ct entry into the
> skb, so ingress+IFB can take action on it.

Thanks for the info. I guess the implementation is this one:

https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/621-sched_act_connmark.patch
https://dev.openwrt.org/browser/trunk/package/network/utils/iproute2/patches/210-add-act_connmark.patch
https://dev.openwrt.org/browser/trunk/package/network/config/qos-scripts/files/usr/lib/qos/generate.sh#L343

> Perhaps a cleaned up version of this would be suitable for upstream?

I don't know but this seems a useful feature to me.

Best regards,
Alban
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