netdev - Re: [PATCH net] bridge: clean the nf_bridge status when forwarding the skb

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Message-ID: <20131018144618.GL2596@neomailbox.net>
Date:	Fri, 18 Oct 2013 16:46:18 +0200
From:	Antonio Quartulli <antonio@...hcoding.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Antonio Quartulli <antonio@...n-mesh.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH net] bridge: clean the nf_bridge status when forwarding
 the skb

On Fri, Oct 18, 2013 at 10:32:09AM -0400, Vlad Yasevich wrote:
> On 10/18/2013 07:35 AM, Antonio Quartulli wrote:
> > On Fri, Oct 18, 2013 at 01:10:41PM +0200, Pablo Neira Ayuso wrote:
> >> On Thu, Oct 17, 2013 at 01:37:35PM +0200, Antonio Quartulli wrote:
> >>> On Thu, Oct 17, 2013 at 04:28:57AM -0700, Pablo Neira Ayuso wrote:

[...]

> >
> > The problem I was having was due to an skb entering br0 first and br1 later.
> > When reaching br1 skb->nf_bridge was != NULL because of the previous processing
> > in br0.
> >
> 
> Doesn't br_nf_pre_routing already take care of this for you?  It will 
> drop the ref on the current nf_bridge and allocate a new one.  Is that
> not sufficient?

In my case that line is not reached because

 700         if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb))

is always true: the packet getting analysed is a batman-adv encapsulated packet,
which does not match any of the three above.

Cheers,

-- 
Antonio Quartulli

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