netdev - Re: [RFC] wireless, ipv4, ipv6: drop GTK-protected unicast IP packets

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Message-ID: <1385044264.14273.6.camel@jlt4.sipsolutions.net>
Date:	Thu, 21 Nov 2013 15:31:04 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Jouni Malinen <jouni@....qualcomm.com>
Subject: Re: [RFC] wireless, ipv4, ipv6: drop GTK-protected unicast IP
 packets

On Thu, 2013-11-21 at 06:24 -0800, Eric Dumazet wrote:
> On Thu, 2013-11-21 at 14:08 +0100, Johannes Berg wrote:
> > On Thu, 2013-11-21 at 14:05 +0100, Johannes Berg wrote:
> > 
> > > @@ -498,7 +500,8 @@ struct sk_buff {
> > >  	 * headers if needed
> > >  	 */
> > >  	__u8			encapsulation:1;
> > > -	/* 7/9 bit hole (depending on ndisc_nodetype presence) */
> > > +	__u8			drop_unicast:1;
> > 
> > The obvious question is here, and for IPv4/IPv6 - should the wireless
> > stack be responsible for doing this instead?
> 
> I don't really like the idea of reserving a bit for this in sk_buff,
> and propagate it in every cloning ...
> 
> Someone should replace __copy_skb_header() by a single memset(),
> because copying all these bits one by one is not really clever.
> 
> And then, adding a test in fast path (ip_rcv_finish()) is really not
> nice.

Yeah, that was a concern too. I'll do it entirely in the wireless stack
instead I guess. At least it'll be hidden away inside the if that
already does the group key check etc.

Thanks.

johannes

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