mac80211: provide interface iterator for drivers

Sometimes drivers need to know which interfaces are associated with
their hardware. Rather than forcing those drivers to keep track of
the interfaces that were added, this adds an iteration function to
mac80211.

As it is intended to be used from the interface add/remove callbacks,
the iteration function may currently only be called under RTNL.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 17b60391fcd66c7ba94ff14b44c0139881412b8b..1470e1b886f09e865b9576bc2628f5e428549ea4 100644 (file)
--- 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 5a0564e1dbd6ca387c5c44d854bcd2b38fc0e84a..88f262baaa5ec11bd79df1cd52bb77f3d85470c6 100644 (file)
--- 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);