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@xxxxxxxxx>
---
net/wireless/chan.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
net/wireless/core.h | 12 ++++++++++++
2 files changed, 63 insertions(+), 0 deletions(-)
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index c1999e4..167e7cb 100644
--- 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 fef476d..56f18c2 100644
--- 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);
--
1.7.0.4
--
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