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

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Message-ID: <526154B2.2060900@redhat.com>
Date:	Fri, 18 Oct 2013 11:33:06 -0400
From:	Vlad Yasevich <vyasevic@...hat.com>
To:	Antonio Quartulli <antonio@...hcoding.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 10/18/2013 10:46 AM, Antonio Quartulli wrote:
> 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,
>

Looking at other encapsulators (PPP, iptunnel, VXLAN), they do
nf_reset() on input.  Would that be appropriate for batman as well?

-vlad
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