netdev - Re: [PATCH next 0/2] ipvlan: packet scrub

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Date:   Fri, 15 Dec 2017 11:37:14 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     mahesh@...dewar.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, maheshb@...gle.com
Subject: Re: [PATCH next 0/2] ipvlan: packet scrub

From: Mahesh Bandewar <mahesh@...dewar.net>
Date: Wed, 13 Dec 2017 14:40:12 -0800

> From: Mahesh Bandewar <maheshb@...gle.com>
> 
> While crossing namespace boundary IPvlan aggressively scrubs packets.
> This is creating problems. First thing is that scrubbing changes the 
> packet type in skb meta-data to PACKET_HOST. This causes erroneous
> packet delivery when dev_forward_skb() has already marked the packet
> type as OTHER_HOST.
> 
> On the egress side scrubbing just before calling dev_queue_xmit()
> creates another set of problems. Scrubbing remove skb->sk so the
> prio update gets missed and more seriously, socket back-pressure
> fails making TSQ not function correctly.
> 
> The first patch in the series just reverts the earlier change which
> was adding a mac-check, but that is unnecessary if packet_type that
> dev_forward_skb() has set is honored. The second path removes two of
> the scrubs which are causing problems described above.

Series applied, thanks for following up on this.