1 files changed, 43 insertions, 1 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index f4a15d2e5eaf..f11345e163d7 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -252,6 +252,44 @@ static void batadv_check_known_mac_addr(const struct net_device *net_dev)
 	rcu_read_unlock();
 }
 
+/**
+ * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
+ * @soft_iface: netdev struct of the mesh interface
+ */
+static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
+{
+	const struct batadv_hard_iface *hard_iface;
+	unsigned short lower_header_len = ETH_HLEN;
+	unsigned short lower_headroom = 0;
+	unsigned short lower_tailroom = 0;
+	unsigned short needed_headroom;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
+			continue;
+
+		if (hard_iface->soft_iface != soft_iface)
+			continue;
+
+		lower_header_len = max_t(unsigned short, lower_header_len,
+					 hard_iface->net_dev->hard_header_len);
+
+		lower_headroom = max_t(unsigned short, lower_headroom,
+				       hard_iface->net_dev->needed_headroom);
+
+		lower_tailroom = max_t(unsigned short, lower_tailroom,
+				       hard_iface->net_dev->needed_tailroom);
+	}
+	rcu_read_unlock();
+
+	needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
+	needed_headroom += batadv_max_header_len();
+
+	soft_iface->needed_headroom = needed_headroom;
+	soft_iface->needed_tailroom = lower_tailroom;
+}
+
 int batadv_hardif_min_mtu(struct net_device *soft_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
@@ -474,6 +512,8 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 			   "Not using interface %s (retrying later): interface not active\n",
 			   hard_iface->net_dev->name);
 
+	batadv_hardif_recalc_extra_skbroom(soft_iface);
+
 	/* begin scheduling originator messages on that interface */
 	batadv_schedule_bat_ogm(hard_iface);
 
@@ -528,6 +568,9 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 	batadv_purge_outstanding_packets(bat_priv, hard_iface);
 	dev_put(hard_iface->soft_iface);
 
+	netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
+	batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
+
 	/* nobody uses this interface anymore */
 	if (!bat_priv->num_ifaces) {
 		batadv_gw_check_client_stop(bat_priv);
@@ -536,7 +579,6 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 			batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 	}
 
-	netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 	hard_iface->soft_iface = NULL;
 	batadv_hardif_free_ref(hard_iface);