How to enable FILS feature on Raspberry Pi 3b+ platform

Jouni Malinen j at w1.fi
Mon Sep 9 05:52:21 PDT 2019


On Mon, Aug 12, 2019 at 04:45:04PM +0900, Xiao Ma wrote:
> I would like to have a check if it's possible to enable FILS feature
> on Raspberry Pi 3b+ platform and create a wireless network with FILS
> feature, if so I can verify the authentication and HLP features.

> if my understanding is correct from reading the IEEE80211ai standard,
> AP which can support FILS capability would broadcast Beacon frame with
> FILS Indication element (element ID: 240) and also set FILS Capability
> bit (bit 72) in the Extended Capabilities element. I can observe the
> FILS indication element bytes from the output log of hostapd, like
> below:
> 
> nl80211: Beacon head - hexdump(len=57): 80 00 00 00 ff ff ff ff ff ff
> b8 27 eb 70 e9 b0 b8 27 eb 70 e9 b0 00 00 00 00 00 00 00 00 00 00 64
> 00 31 04 00 06 50 69 34 2d 41 50 01 08 82 84 8b 96 0c 12 18 24 03 01
> 0b
> nl80211: Beacon tail - hexdump(len=39): 2a 01 00 32 04 30 48 60 6c 30
> 14 01 00 00 0f ac 04 01 00 00 0f ac 04 01 00 00 0f ac 02 00 00 f0 06
> 80 02 12 34 d4 c9
> 
> the last 8 bytes: f0 06 80 02 12 34 d4 c9, I believe that's FILS
> indication elements.

So hostapd side seems to be working..

> However, when I use wireshark to capture the packet over the air, I
> didn't notice these kind of information appeared in the Beacon frame
> sent from AP (Raspberry Pi 3b+). Not sure if the nl80211 driver on
> Raspberry Pi does't support FILS feature yet or something else.

.. but the driver does not. This would be more of a question to whoever
maintains that driver since this sounds like a driver-specific
constraint.

-- 
Jouni Malinen                                            PGP id EFC895FA



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