[PATCH 1/3] mac80211: implement ieee80211_get_vif_by_addr

[Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>]

ieee80211_get_vif_by_addr allows low level drivers to get a reference to
vif data structure which is not added to the driver as monitor interface.
ieee80211_get_vif_by_addr will be used in ath9k tx99 code

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
---
 include/net/mac80211.h |  9 +++++++++
 net/mac80211/util.c    | 26 ++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7ceed99..cdec60d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -4585,4 +4585,13 @@ bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
 			      struct ieee80211_vif *vif, struct sk_buff *skb,
 			      int band, struct ieee80211_sta **sta);
 
+/**
+ * ieee80211_get_vif_by_addr - get vif for given mac address
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ * @mac: mac address
+ *
+ */
+struct ieee80211_vif *ieee80211_get_vif_by_addr(struct ieee80211_hw *hw,
+						const u8 *mac);
+
 #endif /* MAC80211_H */
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 592a181..6a7a3df 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2472,3 +2472,29 @@ int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
 	ieee80211_tx_skb(sdata, skb);
 	return 0;
 }
+
+/**
+ * ieee80211_get_vif_by_addr - get vif for given mac address
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ * @mac: mac address
+ *
+ */
+struct ieee80211_vif *ieee80211_get_vif_by_addr(struct ieee80211_hw *hw,
+						const u8 *mac)
+{
+	struct ieee80211_vif *vif = NULL;
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct ieee80211_sub_if_data *sdata;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		if (!compare_ether_addr(sdata->vif.addr, mac)) {
+			vif = &sdata->vif;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	return vif;
+}
+EXPORT_SYMBOL(ieee80211_get_vif_by_addr);
-- 
1.8.3.2