netdev - Re: [PATCH] iptables: use skb->len for accounting

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Message-ID: <1279868302.2482.113.camel@edumazet-laptop>
Date:	Fri, 23 Jul 2010 08:58:22 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] iptables: use skb->len for accounting

Le vendredi 23 juillet 2010 à 14:47 +0800, Changli Gao a écrit :
> On Fri, Jul 23, 2010 at 2:29 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > Le vendredi 23 juillet 2010 à 11:34 +0800, Changli Gao a écrit :
> >> iptables: use skb->len for accounting
> >>
> >> use skb->len for accounting as xt_quota does.
> >>
> >
> > Why ?
> >
> > This is a gratuitous change, unless you have very strong arguments.
> >
> > xt_quota is an exception, dont change all others because of it !
> 
> exception ? Why ?

Because it handles all protocols...

So skb->len is a shortcut, an approximation if you want.

At IPV4 level, ip->tot_len is an exact value.



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