netdev - Re: NAT regression in next tree

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Date:	Fri, 19 Feb 2010 10:11:27 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: NAT regression in next tree

On Fri, 19 Feb 2010 08:27:33 +0100
Patrick McHardy <kaber@...sh.net> wrote:

> Eric Dumazet wrote:
> > Le vendredi 19 février 2010 à 08:06 +0100, Patrick McHardy a écrit :
> >>     netfilter: restore POST_ROUTING hook in NF_HOOK_COND
> >>     
> >>     Commit 2249065 ("netfilter: get rid of the grossness in netfilter.h")
> >>     inverted the logic for conditional hook invocation, breaking the
> >>     POST_ROUTING hook invoked by ip_output().
> >>     
> >>     Correct the logic and remove an unnecessary initialization.
> >>     
> >>     Reported-by: Stephen Hemminger <shemminger@...tta.com>
> >>     Signed-off-by: Patrick McHardy <kaber@...sh.net>
> >>
> >> diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
> >> index 7007945..89341c3 100644
> >> --- a/include/linux/netfilter.h
> >> +++ b/include/linux/netfilter.h
> >> @@ -212,8 +212,9 @@ NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
> >>  	     struct net_device *in, struct net_device *out,
> >>  	     int (*okfn)(struct sk_buff *), bool cond)
> >>  {
> >> -	int ret = 1;
> >> -	if (cond ||
> >> +	int ret;
> >> +
> >> +	if (!cond ||
> >>  	    (ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN) == 1))
> >>  		ret = okfn(skb);
> >>  	return ret;
> > 
> > I dont quite get it
> > 
> > Original code was :
> > 
> > 
> > #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond)                \
> > ({int __ret;                                                                  \
> > if ((cond) || (__ret = nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN)) == 1)\
> >        __ret = (okfn)(skb);                                                   \
> > __ret;})
> > 
> > 
> > There was no condition inversion.
> 
> Right, I quoted the wrong patch, it was actually broken in
> 23f3733 ("netfilter: reduce NF_HOOK by one argument"), which
> moved the cond check from nf_hook_thresh() to NF_HOOK_COND().

Yes, this fixes the problem I was seeing.

Acked-by: Stephen Hemminger <shemminger@...tta.com>

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