Can we ignore frames with invalid BSSID in IBSS mode?

Johannes Berg johannes at
Tue Sep 29 23:46:55 PDT 2015

On Fri, 2015-09-25 at 16:00 -0700, Ben Greear wrote:
> It seems that ath10k ar988X hardware has a bug where the BSSID
> for IBSS AMSDU frames is all zeros.  The 'main' 636 ath10k firmware
> does not seem to use AMSDUs for IBSS, and when I enable it in my CT
> firmware, then I see the breakage.  So, I suspect it is not
> just a simple software/firmware bug.
> If I simply ignore the bssid_match check in ieee80211_accept_frame,
> then it seems everything runs fine.
> So, I'm curious if anyone knows what sorts of bad things could happen
> if the bssid_match check is ignored?  Maybe bcast/mcast frames could
> be accepted when they shouldn't be in certain cases?

You could end up accepting multicast frames from a different,
overlapping, BSS? Seems like a bad idea.


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