batman-adv: create helper function to get AP isolation status

The AP isolation status may be evaluated in different spots.
Create an helper function to avoid code duplication.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>

1 files changed, 26 insertions, 0 deletions

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 8abda424aae3..945e441b579d 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -1171,6 +1171,32 @@ unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
         return vid;
 }
 
+/**
+ * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier for which the AP isolation attributed as to be
+ *  looked up
+ *
+ * Returns true if AP isolation is on for the VLAN idenfied by vid, false
+ * otherwise
+ */
+bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
+{
+        bool ap_isolation_enabled = false;
+        struct batadv_softif_vlan *vlan;
+
+        /* if the AP isolation is requested on a VLAN, then check for its
+         * setting in the proper VLAN private data structure
+         */
+        vlan = batadv_softif_vlan_get(bat_priv, vid);
+        if (vlan) {
+                ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
+                batadv_softif_vlan_free_ref(vlan);
+        }
+
+        return ap_isolation_enabled;
+}
+
 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
 {
         struct batadv_algo_ops *bat_algo_ops;