netdev - Re: linux-next: Tree for Aug 6 [ wireless | iwlwifi

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Date:	Tue, 06 Aug 2013 23:45:38 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	sedat.dilek@...il.com
Cc:	David Miller <davem@...emloft.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	wireless <linux-wireless@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: linux-next: Tree for Aug 6 [ wireless | iwlwifi | mac80211 ? ]

On Tue, 2013-08-06 at 23:40 +0200, Sedat Dilek wrote:

> > Does the problem occur on client or server side? AFAICT, hostapd as well
> > as wpa_supplicant use AF_PACKET.
> >
> > The tricky thing is, these patches are meant to *loosen* the
> > restrictions in af_packet.c, so *should* not be harmful. So either my
> > patches create a side effect I did not foresee, or it's something nasty
> > (too much delay introduced by calling eth_type_trans() or so).

> By reverting the culprit commit my network/wifi is fine, again.
> See also attached patch with changelog.

I think skb->protocol is probably getting set up wrong, and just putting
back the last two lines

        skb->protocol = proto;
        skb->dev = dev;

is probably sufficient to fix wifi. If skb->protocol isn't set to
ETH_P_PAE, then we'd drop the packet in the wifi stack - might be worth
printing out what it's set to at the point where the skb->protocol
assignment above was removed.

I'm trying to wrap my head around all this right now but I don't yet see
how the code after the patch would not get skb->protocol correct.

johannes

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