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: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index c1999e45a07c125b51592a95763412e5863b2c37..167e7cb60089d348135543441a2dc810e71ce25b 100644 (file)
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -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;
+}

diff --git a/net/wireless/core.h b/net/wireless/core.h
index fef476d2117e04a593f1138f4751262d04a9b3c9..56f18c2eb9190242d30c01f670227692df22c250 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -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);