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Commit 26ab9a0c authored by Michal Kazior's avatar Michal Kazior Committed by Johannes Berg
Browse files

cfg80211: introduce cfg80211_get_chan_state 



Helper function for finding out which channel is
used by a given interface.

An exclusive channel can be used only by a single
interface. This is mainly for non-fixed channel
IBSS handling.

Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent c30a3d38

net/wireless/chan.c

+51 −0
Original line number Diff line number Diff line
@@ -92,3 +92,54 @@ int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 


	return rdev->ops->set_monitor_channel(&rdev->wiphy, chan, chantype);

}



void

cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,

		        struct wireless_dev *wdev,

		        struct ieee80211_channel **chan,

		        enum cfg80211_chan_mode *chanmode)

{

	*chan = NULL;

	*chanmode = CHAN_MODE_UNDEFINED;



	ASSERT_RDEV_LOCK(rdev);

	ASSERT_WDEV_LOCK(wdev);



	if (!netif_running(wdev->netdev))

		return;



	switch (wdev->iftype) {

	case NL80211_IFTYPE_ADHOC:

		if (wdev->current_bss) {

			*chan = wdev->current_bss->pub.channel;

			*chanmode = wdev->ibss_fixed

				  ? CHAN_MODE_SHARED

				  : CHAN_MODE_EXCLUSIVE;

			return;

		}

	case NL80211_IFTYPE_STATION:

	case NL80211_IFTYPE_P2P_CLIENT:

		if (wdev->current_bss) {

			*chan = wdev->current_bss->pub.channel;

			*chanmode = CHAN_MODE_SHARED;

			return;

		}

		break;

	case NL80211_IFTYPE_AP:

	case NL80211_IFTYPE_P2P_GO:

	case NL80211_IFTYPE_MESH_POINT:

		*chan = wdev->channel;

		*chanmode = CHAN_MODE_SHARED;

		return;

	case NL80211_IFTYPE_MONITOR:

	case NL80211_IFTYPE_AP_VLAN:

	case NL80211_IFTYPE_WDS:

		/* these interface types don't really have a channel */

		return;

	case NL80211_IFTYPE_UNSPECIFIED:

	case NUM_NL80211_IFTYPES:

		WARN_ON(1);

	}



	return;

}

net/wireless/core.h

+12 −0
Original line number Diff line number Diff line
@@ -241,6 +241,12 @@ struct cfg80211_cached_keys { 
	int def, defmgmt;

};



enum cfg80211_chan_mode {

	CHAN_MODE_UNDEFINED,

	CHAN_MODE_SHARED,

	CHAN_MODE_EXCLUSIVE,

};





/* free object */

extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
@@ -419,6 +425,12 @@ cfg80211_can_add_interface(struct cfg80211_registered_device *rdev, 
	return cfg80211_can_change_interface(rdev, NULL, iftype);

}



void

cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,

		        struct wireless_dev *wdev,

		        struct ieee80211_channel **chan,

		        enum cfg80211_chan_mode *chanmode);



struct ieee80211_channel *

rdev_freq_to_chan(struct cfg80211_registered_device *rdev,

		  int freq, enum nl80211_channel_type channel_type);