[PATCH 9/9] mac80211: save transmit power envelope element and power constraint

[Wen Gong]

On 2021-08-13 15:25, Johannes Berg wrote:
> On Fri, 2021-08-13 at 09:19 +0200, Johannes Berg wrote:
>> 
>> > > 2) Should we at least check it again from the protected beacon or such
>> > > after association, so we don't blindly trust the probe response or
>> > > beacon (received during scan, not validated) at least when BIGTK is in
>> > > use?
>> >
>> > May we add support for BIGTK in future with another patch?
>> 
>> We already have BIGTK support in mac80211, so if we don't do that now
>> we're almost certainly not going to do it, so I'd really prefer if you
>> did it here, or if a separate patch still did it now.
> 
> Actually, I should say though - the question was more whether we even
> need/want that, rather than whether we can do it later or not.
> 
> If we should protect this data/information then IMHO we should do it
> now, but it's not clear to me that we should, given that we also don't
> have encrypted association response and we still take information from
> there too, etc.
> 
> johannes
I prefer to add a new enum(not use BSS_CHANGED_TXPOWER),e.g, 
BSS_CHANGED_PWR_ENV.
And add check in ieee80211_rx_mgmt_beacon() as well as 
ieee80211_handle_pwr_constr(),
when the value of pwr_reduction or content of elems.tx_pwr_env changed,
save the pwr_reduction and elems.tx_pwr_env to ieee80211_bss_conf, and 
notify lower
driver with BSS_CHANGED_PWR_ENV, then lower driver will do next action.