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In-Reply-To: <20181221101756.GA19960@x1.vandijck-laurijssen.be>
From:   Marcin Sielski <marcin.sielski@gmail.com>
Date:   Fri, 21 Dec 2018 21:24:01 +0100
Message-ID: <CANWiEci9pCaxmSd30QMBY1gC5cFsDM8xeDyeq+C3_mxy7NP=qg@mail.gmail.com>
Subject: Re: question concerning Japan regulation and NO-OUTDOOR
To:     linux-wireless@vger.kernel.org
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Hi,

I think indoor/outdoor hint is currently only set by hostapd (see
phy_info_freq function at driver_nl80211_capa.c).
The entire implementation is based on US FCC regulations which allows
passive scanning.
https://apps.fcc.gov/eas/comments/GetPublishedDocument.html?id=3D327&tn=3D5=
28122
I am curious how it is defined in EU RED.

Best Regards

Marcin Sielski

pt., 21 gru 2018 o 17:25 Kurt Van Dijck
<dev.kurt@vandijck-laurijssen.be> napisa=C5=82(a):
>
> Hey all,
>
> I work on a project for an outdoor device equipped with a Ralink wifi
> key. In order to get certified in Japan, we should be able to proof that
> the device is not using the 5.2GHz bands since this band is limited to
> indoor use only in Japan.
> As I understood, 5.4GHz and up are allowed.
>
> My first, rather rough, approach is to specify all 2.4GHz bands in
> wpa_supplicant's global 'freq_list' parameter.
> We found that our device still connect to 5GHz networks, I believe
> because passive scanning allows 5GHz networks to be detected anyway.
>
> 2nd attempt, on top of the 1st, is to patch wpa_supplicant with:
>
> diff --git a/wpa_supplicant/events.c b/wpa_supplicant/events.c
> index 37d429d..c32aa1a 100644
> --- a/wpa_supplicant/events.c
> +++ b/wpa_supplicant/events.c
> @@ -1223,6 +1223,13 @@ struct wpa_ssid * wpa_scan_res_match(struct wpa_su=
pplicant *wpa_s,
>                         continue;
>                 }
>
> +               if (!freq_allowed(wpa_s->conf->freq_list, bss->freq)) {
> +                       wpa_msg(wpa_s, MSG_INFO,
> +                               "frequency %u excluded", bss->freq);
> +                       wpa_dbg(wpa_s, MSG_DEBUG,
> +                               "   skip - avoid this frequency");
> +                       continue;
> +               }
>                 if (!freq_allowed(ssid->freq_list, bss->freq)) {
>                         if (debug_print)
>                                 wpa_dbg(wpa_s, MSG_DEBUG,
>
> In short, this enforces wpa_supplicant to honor the global freq_list
> parameter for joining accesspoints, as it does for per-network
> freq_lists.
>
> Is this sufficient to avoid our chip to send on 5GHz band?
>
> I also noticed some NO-OUTDOOR specifiers in the wireless regdb,
> but not on the 5.2GHz bands for Japan.
> I'm in the position to find out those details, and I'm willing to amend
> in the upstream repository.
> I do not yet see however how I can tell the kernel that it should limit
> wifi regulation to outdoor use only. There seems no simple 'iw reg set
> outdoor' or similar command. How is this done?
>
> Thanks for your responses in advance,
> Kurt