[ath9k-devel] Cryptography of ath9k driver

On 26 October 2016 at 08:53, Jeon <[email protected]> wrote:

> I am investigating how ath9k performs cryptography.
>
> In slide 15 of DEFCON conference 2014 (link
> <https://docs.google.com/presentation/d/1CofNlbHs2bLdJuW3VACzAImqesGQoktUTXS6zKgDDKI/edit#slide=id.g371192f19_070>),
> it says, ath9k performs cryptography a on software side.
>
> On the other hand, when I look into ath9k source codes, I found somethings
> like below:
>
> ath9k/common.c:162-166:
>
>     if (ah->sw_mgmt_crypto_rx &&
>   (rxs->flag & RX_FLAG_DECRYPTED) &&
>   ieee80211_is_mgmt(fc))
>   /* Use software decrypt for management frames. */
>   rxs->flag &= ~RX_FLAG_DECRYPTED;
>
> As I understand, ath9k can choose hw/sw cryptography for management
> frames. However, what about data frames? I couldn't find any clue about
> cryptography for data frames.
>
> Can I take it as ath9k already performs software cryptography for data
> frames and shifts the responsibility of cryptography to mac80211 driver?
> And exceptionally for management frames, can ath9k choose hw/sw
> cryptography?
>
>
modinfo ath9k (check nohwcrypt param)

BR
Janusz
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