Subject: Re: [PATCH v2] Re: problem with IPoA (CLIP), NAT, and VLANS

From: Jarek Poplawski <[email-masked]>
Date: Tue, 17 Feb 2009 11:53:57 +0000

On Tue, Feb 17, 2009 at 12:05:24PM +0100, Karl Hiramoto wrote:
> 
> 
> Jarek Poplawski wrote:
> > Sorry:
> > -----------------> take 2: changelog fix only
> >
> > vlan: Update skb->mac_header in __vlan_put_tag().
> >
> > After moving mac addresses in __vlan_put_tag() skb->mac_header needs
> > to be updated.
> >   
> This works on IPoE.  I notice no change with or w/o this patch on IPoE
> only routing.    However has no effect on the original problem i
> reported with  IPoA --> NAT --> VLAN
> 
> Tested-by: Karl Hiramoto <[email-masked]>

Yes, since it didn't affect the working case with your patch, I didn't
expect it would matter here, but it looks like needed so good to know
it seems not to make anything wrong at least.

Thanks for testing,
Jarek P.

> 
> > Reported-by: Karl Hiramoto <[email-masked]>
> > Signed-off-by: Jarek Poplawski <[email-masked]>
> > ---
> >
> >  include/linux/if_vlan.h |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
> > index f8ff918..e1ff5b1 100644
> > --- a/include/linux/if_vlan.h
> > +++ b/include/linux/if_vlan.h
> > @@ -210,6 +210,7 @@ static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
> >  
> >  	/* Move the mac addresses to the beginning of the new header. */
> >  	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
> > +	skb->mac_header -= VLAN_HLEN;
> >  
> >  	/* first, the ethernet type */
> >  	veth->h_vlan_proto = htons(ETH_P_8021Q);
> >
> > --
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> >
> >   
>