After some messing around with the receive path in the driver i did the
following:
- I enabled the receive tasklet without being associated
- In ath9k/mac.c, i disabled
/* OH MY GOD ...
if ((adsp->ds_rxstatus8 & AR_RxDone) == 0)
return -EINPROGRESS;
*/
- In the ath_rx_tasklet, i've added output for the frame control fields and
obtained :
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429497] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x976
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429522] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x0
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429544] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x2d30
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429567] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x2d30
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429590] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x976
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429613] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x2d30
Oct 4 11:11:37 mobac-ideapad2 kernel: [ 769.429635] ath_rx_tasklet: right
before call of ath9k_rx_skb_preprocess, frame control 0x2020
As i see this, the driver now just accepts everything "on air" and tries to
make
sense of it. I did this in order to understand how i could manage to obtain non
standard frames (or at least to obtain frames despite of being associated or
not, in station BUT not in monitor mode). My major problem right now is to
understand, where the driver says "ok, rx is done you can use this buffer" and
what exactly is done by the hardware to filter out frames. Do you have any
comments how this could be tackled without just allowing everything and try to
filter it out later on ? The Goal is to teach the driver a new frame format or
at least allow a reserved 802.11 frame to be received in a setup as described.
Your answers are highly appreciated !
Greetings
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