netdev - Re: [Patch net-next] sched, cls: check if we could overwrite actions when changing a filter

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Date:	Sun, 27 Apr 2014 23:42:52 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	xiyou.wangcong@...il.com
Cc:	netdev@...r.kernel.org, jhs@...atatu.com, cwang@...pensource.com
Subject: Re: [Patch net-next] sched, cls: check if we could overwrite
 actions when changing a filter

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Fri, 25 Apr 2014 13:54:06 -0700

> From: Cong Wang <cwang@...pensource.com>
> 
> When actions are attached to a filter, they are a part of the filter
> itself, so when changing a filter we should allow to overwrite the actions
> inside as well.
> 
> In my specific case, when I tried to _append_ a new action to an existing
> filter which already has an action, I got EEXIST since kernel refused
> to overwrite the existing one in kernel.
> 
> This patch checks if we are changing the filter checking NLM_F_CREATE flag
> (Sigh, filters don't use NLM_F_REPLACE...) and then passes the boolean down
> to actions. This fixes the problem above.
> 
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Cc: David S. Miller <davem@...emloft.net>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> Signed-off-by: Cong Wang <cwang@...pensource.com>
> Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>

Applied.
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