netdev - Re: [PATCH net-next] tc: fix tc actions in case of shared skb

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Message-ID: <55A3B996.6090501@mojatatu.com>
Date:	Mon, 13 Jul 2015 09:13:58 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	Daniel Borkmann <daniel@...earbox.net>,
	Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tc: fix tc actions in case of shared skb

On 07/10/15 20:10, Alexei Starovoitov wrote:
> TC actions need to check for very unlikely event skb->users != 1,
> otherwise subsequent pskb_may_pull/pskb_expand_head will crash.
> When skb_shared() just drop the packet, since in the middle of actions
> it's too late to call skb_share_check(), since classifiers/actions assume
> the same skb pointer.
>

Alexei,
To add to what Dave said - are the rules specified here:
Documentation/networking/tc-actions-env-rules.txt
insufficient?

cheers,
jamal
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