2 files changed, 49 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 17b60391fcd6..1470e1b886f0 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1406,4 +1406,20 @@ void ieee80211_wake_queues(struct ieee80211_hw *hw);
  */
 void ieee80211_scan_completed(struct ieee80211_hw *hw);
 
+/**
+ * ieee80211_iterate_active_interfaces - iterate active interfaces
+ *
+ * This function iterates over the interfaces associated with a given
+ * hardware that are currently active and calls the callback for them.
+ * Must be called under RTNL.
+ *
+ * @hw: the hardware struct of which the interfaces should be iterated over
+ * @iterator: the iterator function to call
+ * @data: first argument of the iterator function
+ */
+void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
+                                         void (*iterator)(void *data, u8 *mac,
+                                                          int if_id),
+                                         void *data);
+
 #endif /* MAC80211_H */
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 5a0564e1dbd6..88f262baaa5e 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -22,6 +22,7 @@
 #include <linux/bitmap.h>
 #include <net/net_namespace.h>
 #include <net/cfg80211.h>
+#include <net/rtnetlink.h>
 
 #include "ieee80211_i.h"
 #include "ieee80211_rate.h"
@@ -484,3 +485,35 @@ void ieee80211_wake_queues(struct ieee80211_hw *hw)
                 ieee80211_wake_queue(hw, i);
 }
 EXPORT_SYMBOL(ieee80211_wake_queues);
+
+void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
+                                         void (*iterator)(void *data, u8 *mac,
+                                                          int if_id),
+                                         void *data)
+{
+        struct ieee80211_local *local = hw_to_local(hw);
+        struct ieee80211_sub_if_data *sdata;
+
+        ASSERT_RTNL();
+
+        /* we hold the RTNL here so can safely walk the list */
+        list_for_each_entry(sdata, &local->interfaces, list) {
+                switch (sdata->type) {
+                case IEEE80211_IF_TYPE_INVALID:
+                case IEEE80211_IF_TYPE_MNTR:
+                case IEEE80211_IF_TYPE_VLAN:
+                        continue;
+                case IEEE80211_IF_TYPE_AP:
+                case IEEE80211_IF_TYPE_STA:
+                case IEEE80211_IF_TYPE_IBSS:
+                case IEEE80211_IF_TYPE_WDS:
+                        break;
+                }
+                if (sdata->dev == local->mdev)
+                        continue;
+                if (netif_running(sdata->dev))
+                        iterator(data, sdata->dev->dev_addr,
+                                 sdata->dev->ifindex);
+        }
+}
+EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);