[PATCH 9/9] TDLS: return channel-switch indication in link status cmd

Peer, Ilan ilan.peer
Sun Jun 21 11:15:30 PDT 2015

Hi Jouni,

> -----Original Message-----
> From: Jouni Malinen [mailto:j at w1.fi]
> Sent: Friday, June 19, 2015 16:30
> To: Peer, Ilan
> Cc: hostap at lists.shmoo.com; Arik Nemtsov; Nemtsov, ArikX
> Subject: Re: [PATCH 9/9] TDLS: return channel-switch indication in link status
> cmd
> On Wed, Jun 17, 2015 at 04:18:21PM +0300, Ilan Peer wrote:
> > Return an appropriate indication in the tdls_get_link_status command
> > when when channel switching is enabled for the TDLS peer.
> > diff --git a/src/rsn_supp/tdls.c b/src/rsn_supp/tdls.c @@ -902,6
> > +902,9 @@ const char * wpa_tdls_get_link_status(struct wpa_sm *sm,
> const u8 *addr)
> >  	if (!peer->tpk_success)
> >  		return "peer not connected";
> >
> > +	if (peer->chan_switch_enabled)
> > +		return "connected/channel-switching";
> > +
> >  	return "connected";
> This would change control interface TDLS_LINK_STATUS output. Couldn't that
> break existing users of the interface?

This seemed like an extension, that should not have an effect on current users, but I guess this might break users that search for an exact status line match etc.

> Why would the link status indicate whether channel switching has been
> enabled? This does not necessarily mean that channel switching is in use (i.e.,
> up to the driver to decide whether to use that or not). What would upper
> layer programs do with this information?

Really only for status reporting, just like any other status data reported on the control interface.

> Another possibility could be to add another line into the TDLS_LINK_STATUS
> output so that the current "TDLS link status: <value>"
> values would not change for the "connected" case. I'm not sure how much
> more likely external users would be able to parse this, but at least the current
> output looks like something that could be followed by other lines of
> information.

Will change to this format. 



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