netdev - Re: [PATCH] netfilter: xt

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Date:	Mon, 14 May 2012 18:09:16 +0200
From:	Hans Schillstrom <hans.schillstrom@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Jan Engelhardt <jengelh@...i.de>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"jengelh@...ozas.de" <jengelh@...ozas.de>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
	"hans@...illstrom.com" <hans@...illstrom.com>
Subject: Re: [PATCH] netfilter: xt_HMARK: endian bugs

On Monday 14 May 2012 17:24:39 Eric Dumazet wrote:
> On Mon, 2012-05-14 at 17:05 +0200, Jan Engelhardt wrote:
> > On Monday 2012-05-14 16:40, Pablo Neira Ayuso wrote:
> > 
> > >> -		if (t->uports.p16.dst < t->uports.p16.src)
> > >> +		if (ntohs(t->uports.p16.dst) < ntohs(t->uports.p16.src))
> > >
> > >Do we really need this to make sparse happy?
> > 
> > You need it to make *maths* happy.
> > 
> > Consider
> > 
> > 	384 < 65407
> > 
> > but
> > 
> > 	    ntohs(384) > ntohs(65407)
> > 	<=> 32769 > 32767
> > --
> 
> Doesnt matter at all in this context.

This context can contain both le & be machines,
so at least in hmark it make sense

> Take a look at 
> 
> void __skb_get_rxhash(struct sk_buff *skb)
> 
> if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
> 	swap(...)
> 
> 



-- 
Regards
Hans Schillstrom <hans.schillstrom@...csson.com>
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