netdev - Re: [PATCH] net: ipv4: ip_send_unicast_reply should set oif only if it is L3 master

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Date:   Wed, 09 Nov 2016 21:48:24 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     dsa@...ulusnetworks.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] net: ipv4: ip_send_unicast_reply should set oif only
 if it is L3 master

From: David Ahern <dsa@...ulusnetworks.com>
Date: Tue,  8 Nov 2016 14:50:31 -0800

> Lorenzo noted an Android unit test failed due to commit e0d56fdd7342:
>   "The expectation in the test was that the RST replying to a SYN sent to a
>   closed port should be generated with oif=0. In other words it should not
>   prefer the interface where the SYN came in on, but instead should follow
>   whatever the routing table says it should do."
> 
> Since this a change in behavior, revert the change to
> ip_send_unicast_reply such that the oif in the flow is set to the skb_iif
> only if skb_iif is an L3 master.
> 
> Fixes: e0d56fdd7342 ("net: l3mdev: remove redundant calls")
> Reported-by: Lorenzo Colitti <lorenzo@...gle.com>
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>

David, I'm assuming that a new spin of this patch is coming.