netdev - Re: regression: tethering fails in 3.5 with iwlwifi

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Date:	Thu, 20 Sep 2012 14:51:45 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	artem.bityutskiy@...ux.intel.com, linux-wireless@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: regression: tethering fails in 3.5 with iwlwifi

On Thu, 2012-09-20 at 14:47 +0200, Johannes Berg wrote:

> >                 if (skb) {
> >                         /* deliver to local stack */
> > -                       skb->protocol = eth_type_trans(skb, dev);
> > -                       memset(skb->cb, 0, sizeof(skb->cb));
> > -                       netif_receive_skb(skb);
> > +                       if (pskb_may_pull(skb, sizeof(struct ethhdr))) {
> > +                               skb->protocol = eth_type_trans(skb, dev);
> > +                               memset(skb->cb, 0, sizeof(skb->cb));
> > +                               netif_receive_skb(skb);
> > +                       } else {
> > +                               kfree_skb(skb);
> > +                       }
> >                 }
> >         }
> 
> Yeah I was looking at the same code just now. However, we had actually
> inserted the skb_linearize() *after* eth_type_trans(), so I'm confused.

Ok actually, by the time we get here the ethernet header must be in the
skb head because we construct it from the 802.11 and llc/snap header.

johannes

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