[ath9k-devel] AuthSAE rekeying issues with ATH9K

Hi Adrian,

I have a patch which does what you want, but that did not fix the issue. This basically reads back then writes the key material for the MIC and the TKIP.
See replumb_did_not_work.diff, attached.

I tried the replumbing in ath9k_cmn_rx_skb_postprocess(), which is in drivers/net/wireless/ath/ath9k/common.c. That was not very successful either.
Lastly I tried ath_rx_tasklet in drivers/net/wireless/ath/ath9k/recv.c. This function actually invokes the ath9k_cmn_rx_skb_postprocess() function.
I'm guessing that these registers should not be written at a whim, but that needs an understanding of the chips workings that I lack.

I had wanted to keep track of the NL80211_STA_INFO_RX_DROP_MISC, which seems to radically increase when things go wrong (mind, it also increases on a working link sometimes). This variable seems to be derived from flags set in the ath9k driver, which are decoded by the mac80211 layer. Thus keeping track on a per-station level proved to be tricky.

As mentioned before, a patch that did fix the issue was resetting the chip when a key was installed. This caused a lot of packet loss and rekeying to happen.
That's here: https://github.com/cozybit/authsae/files/347910/ath9k-install_key-buckshot.diff.txt.


Thanks,

Michel Stam
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