linux-kernel - Re: [net V2] act_mirred: do not drop packets when fails to mirror it

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Message-ID: <1345119107.5398.0.camel@mojatatu>
Date:	Thu, 16 Aug 2012 08:11:47 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [net V2] act_mirred: do not drop packets when fails to mirror
 it

On Thu, 2012-08-16 at 14:44 +0800, Jason Wang wrote:
> We drop packet unconditionally when we fail to mirror it. This is not intended
> in some cases. Consdier for kvm guest, we may mirror the traffic of the bridge
> to a tap device used by a VM. When kernel fails to mirror the packet in
> conditions such as when qemu crashes or stop polling the tap, it's hard for the
> management software to detect such condition and clean the the mirroring
> before. This would lead all packets to the bridge to be dropped and break the
> netowrk of other virtual machines.
> 
> To solve the issue, the patch does not drop packets when kernel fails to mirror
> it, and only drop the redirected packets.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>

cheers,
jamal

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