Re: Please don't puke: Modifying Frame Version, Beacon and Probe-Response values

[Ben Greear <greearb@candelatech.com>]

On 06/01/2016 12:18 PM, Adrian Chadd wrote:
> Hi,
>
> Likely a mix of both. Eg, the RX filter stuff as mentioned above may
> mean that you need to listen to /all/ frames for a BSS, rather than
> just say data and beacon frames. If the beacon frame matching logic
> checks the frame version, you need to listen to /all/ of the frames.
>
> For power management things, it's likely none of that will work, so
> you can't use things like auto-sleep based on beacon traffic / timers
> / TIM bitmap - you'd have to keep the NIC awake all the time.

I'm guessing little of this is in hardware, aside from rx filters,
so probably a few tweaks to the firmware would handle much of this...

And, if for AP mode, then the NIC is always awake anyway, right?

Thanks,
Ben

>
>
>
> -adrian
>
>
> On 1 June 2016 at 04:34, Joerg Pommnitz <pommnitz@yahoo.com> wrote:
>> Hi Adrian,
>> does "hardware assist...will likely not work" mean "forget it, won't work"
>> or "so it would have to be implemented in software instead"?
>>
>>
>>   -- Regards       Joerg
>>
>>
>>
>>> Adrian Chadd <adrian@freebsd.org> schrieb am 17:53 Dienstag, 31.Mai 2016:
>>>> Hi,
>>>
>>> The other thing to keep in mind is the hardware assist for things like
>>> TIM parsing, wakeup, etc will likely not work. :)
>>>
>>>
>>>
>>> -a
>>>
>>>
>>>
>>> On 31 May 2016 at 03:50, Michal Kazior <michal.kazior@tieto.com> wrote:
>>>>   On 31 May 2016 at 10:44, jpo <pommnitz@yahoo.com> wrote:
>>>>>   Hello all,
>>>>>   to implement a "Stealth feature", e.g. the WLAN network does
>>> not show up in
>>>>>   normal Scans, we modified the Frame version, Beacon and Probe-Response
>>>>>   values for an old ATH5K card running on the now dormant Madwifi driver.
>>>>>   Question: Is the same thing even POSSIBLE with ath10k? My main concern
>>> is,
>>>>>   that the firmware just won't handle non-standard values.
>>>>>
>>>>>   Can somebody who understands the division of labor between mac80211,
>>> ath10k,
>>>>>   the firmware and the hardware suppress his or her gag reflex long
>>> enough to
>>>>>   think about this?
>>>>
>>>>   First and foremost you'll need to use firmware with
>>> "raw-mode" support
>>>>   - otherwise firmware just craps over frame headers. Some 10.2.4
>>>>   support it - you can look into the mailing list archive for some
>>>>   discussions.
>>>>
>>>>   Not sure if Rx will work though as firmware-controlled Rx filters may
>>>>   prevent you from receiving frames with crazy frame_control values.
>>>>   You'll need to check this out yourself. Some firmware revisions might
>>>>   have RX_FILTER wmi command support but this isn't used/documented
>>>>   anywhere and it's questionable how much it allows you to override.
>>>>
>>>>   Whatever you find it'd be nice if you post whatever you find out (for
>>>>   posterity :)
>>>>
>>>>
>>>>   Michał
>>>>
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>>>
>
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-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


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