netdev - Re: [GIT PULL v2] Open vSwitch

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Date:	Sun, 27 Nov 2011 16:31:45 -0500
From:	jamal <hadi@...erus.ca>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	John Fastabend <john.r.fastabend@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>,
	"jesse@...ira.com" <jesse@...ira.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [GIT PULL v2] Open vSwitch

On Sun, 2011-11-27 at 20:34 +0100, Lennert Buytenhek wrote:
> On Thu, Nov 24, 2011 at 08:19:39AM -0500, Jamal Hadi Salim wrote:

> There's a bunch of features that the hardware supports that have no
> analog in the Linux networking stack (e.g. port mirroring a non-CPU
> port to another non-CPU port),

You can mirror on Linux; eg to intercept packets on dev XXX
and mirror on eth0:

tc filter add dev XXX parent ffff: prio Y .. match blah \
action mirred egress mirror dev eth0

a more fun one to mirror to two ports:
tc filter add dev XXX parent ffff: prio Y .. match blah \
action mirred egress mirror dev eth0 \
action mirred egress mirror dev eth1

or even more fun, to mirror to two then do a total redirect:
tc filter add dev XXX parent ffff: prio Y .. match blah \
action mirred egress mirror dev eth0 \
action mirred egress mirror dev eth1 \
action mirred egress redirect dev eth2

Of course you can thrown in other actions in between those
to edit packets etc before redirecting.

cheers,
jamal

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