Disabling P2P

[Victor Michel]

Hello,

Context: I am working on some automation which involves wpa_supplicant
and NetworkManager.
My symptoms are that NetworkManager always creates a p2p device (seen
in `nmcli dev`), which I would like to avoid for automation purposes.
NetworkManager does this because wpa_supplicant says that the wlan
device has P2P capabilities.

My initial understanding was that I could avoid that by setting
p2p_disabled=1 in wpa_supplicant config. However, this flag does not
apply to newly-created interfaces. So when NetworkManager recreates
the interface, the 'disabled' check always evaluates to false, which
causes the 'p2p' flag to be set when NetworkManager examines it
through dbus. This is the relevant part:
https://w1.fi/cgit/hostap/tree/wpa_supplicant/dbus/dbus_new_handlers.c#n3538

I experimented a bit with wpa_cli as well - I don't see a way to
configure wpa_supplicant to never advertise p2p capabilities for
newly-created interfaces

* `wpa_cli set p2p_disabled 1` sets `wpa_s->conf->p2p_disabled` which
is checked in the dbus handler, but newly-created interfaces obviously
don't inherit that flag
* `wpa_cli p2p_set disabled 1` sets `wpa_s->global->p2p_disabled`
which is not checked in the dbus new handler linked above (I'm also
not sure if it can be set through a config file)


I am likely misunderstanding a few things (I am entirely new to this
code base) - but am wondering whether there is a way to achieve what I
want? I am unsure whether wpa_supplicant really is working as
expected. Maybe the solution would simply be to have NetworkManager
have its own p2p_disabled setting instead of relying entirely on
wpa_supplicant.

Any advice welcome

Thanks!