netdev - Re: [PATCH 5/5] netfilter: xt_TEE: have cloned packet travel through Xtables too

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Message-ID: <alpine.LSU.2.01.1004022013230.14322@obet.zrqbmnf.qr>
Date:	Fri, 2 Apr 2010 20:15:21 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] netfilter: xt_TEE: have cloned packet travel through
 Xtables too


On Thursday 2010-04-01 16:03, Patrick McHardy wrote:
>>>>[detecting teed packets getting teed again by means of
>>>> iptables -A OUTPUT -j TEE]
>>>
>>> What's wrong with adding a reentrancy counter?
>> 
>> Sounds like a plan.

Should we be using a percpu variable, or is a simplistic
array ok too?

static bool tee_active;

target(...)
{
	if (tee_active[smp_processor_id()])
		return XT_CONTINUE;
	...
	if (tee_tg4_route(...)) {
		tee_active[cpu] = true;
		ip_local_out(skb);
		tee_active[cpu] = false;
	}
}


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