Included changes:

- code beautification
 - remove obsolete 'deleted' attribute for bat-gw node
 - increase internal version number
 - prevent potential access to netdev object after deregistration
 - set needed_head/tail_room for batman virtual interface
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Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge

Antonio Quartulli says:

====================
Included changes:
- code beautification
- remove obsolete 'deleted' attribute for bat-gw node
- increase internal version number
- prevent potential access to netdev object after deregistration
- set needed_head/tail_room for batman virtual interface
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

net/batman-adv/bat_iv_ogm.c

@@ -296,39 +296,13 @@ batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
 			struct batadv_orig_node *orig_node,
 			struct batadv_orig_node *orig_neigh)
 {
-	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
+	struct batadv_neigh_node *neigh_node;
-	struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
 
-	neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
+	neigh_node = batadv_neigh_node_new(orig_node, hard_iface, neigh_addr);
 	if (!neigh_node)
 		goto out;
 
-	if (!atomic_inc_not_zero(&hard_iface->refcount)) {
-		kfree(neigh_node);
-		neigh_node = NULL;
-		goto out;
-	}
-
 	neigh_node->orig_node = orig_neigh;
-	neigh_node->if_incoming = hard_iface;
-
-	spin_lock_bh(&orig_node->neigh_list_lock);
-	tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface,
-					       neigh_addr);
-	if (!tmp_neigh_node) {
-		hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
-	} else {
-		kfree(neigh_node);
-		batadv_hardif_free_ref(hard_iface);
-		neigh_node = tmp_neigh_node;
-	}
-	spin_unlock_bh(&orig_node->neigh_list_lock);
-
-	if (!tmp_neigh_node)
-		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
-			   "Creating new neighbor %pM for orig_node %pM on interface %s\n",
-			   neigh_addr, orig_node->orig,
-			   hard_iface->net_dev->name);
 
 out:
 	return neigh_node;

net/batman-adv/gateway_client.c

@@ -27,7 +27,6 @@
 #include <linux/in.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
-#include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/netdevice.h>
@@ -161,9 +160,6 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
-		if (gw_node->deleted)
-			continue;
-
 		orig_node = gw_node->orig_node;
 		router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
 		if (!router)
@@ -473,9 +469,6 @@ batadv_gw_node_get(struct batadv_priv *bat_priv,
 		if (gw_node_tmp->orig_node != orig_node)
 			continue;
 
-		if (gw_node_tmp->deleted)
-			continue;
-
 		if (!atomic_inc_not_zero(&gw_node_tmp->refcount))
 			continue;
 
@@ -525,9 +518,7 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
 	gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
 	gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
 
-	gw_node->deleted = 0;
 	if (ntohl(gateway->bandwidth_down) == 0) {
-		gw_node->deleted = jiffies;
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Gateway %pM removed from gateway list\n",
 			   orig_node->orig);
@@ -535,14 +526,21 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
 		/* Note: We don't need a NULL check here, since curr_gw never
 		 * gets dereferenced.
 		 */
+		spin_lock_bh(&bat_priv->gw.list_lock);
+		hlist_del_init_rcu(&gw_node->list);
+		spin_unlock_bh(&bat_priv->gw.list_lock);
+
+		batadv_gw_node_free_ref(gw_node);
+
 		curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
 		if (gw_node == curr_gw)
 			batadv_gw_reselect(bat_priv);
+
+		if (curr_gw)
+			batadv_gw_node_free_ref(curr_gw);
 	}
 
 out:
-	if (curr_gw)
-		batadv_gw_node_free_ref(curr_gw);
 	if (gw_node)
 		batadv_gw_node_free_ref(gw_node);
 }
@@ -558,39 +556,18 @@ void batadv_gw_node_delete(struct batadv_priv *bat_priv,
 	batadv_gw_node_update(bat_priv, orig_node, &gateway);
 }
 
-void batadv_gw_node_purge(struct batadv_priv *bat_priv)
+void batadv_gw_node_free(struct batadv_priv *bat_priv)
 {
-	struct batadv_gw_node *gw_node, *curr_gw;
+	struct batadv_gw_node *gw_node;
 	struct hlist_node *node_tmp;
-	unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT);
-	int do_reselect = 0;
-
-	curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
 
 	spin_lock_bh(&bat_priv->gw.list_lock);
-
 	hlist_for_each_entry_safe(gw_node, node_tmp,
 				  &bat_priv->gw.list, list) {
-		if (((!gw_node->deleted) ||
+		hlist_del_init_rcu(&gw_node->list);
-		     (time_before(jiffies, gw_node->deleted + timeout))) &&
-		    atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE)
-			continue;
-
-		if (curr_gw == gw_node)
-			do_reselect = 1;
-
-		hlist_del_rcu(&gw_node->list);
 		batadv_gw_node_free_ref(gw_node);
 	}
-
 	spin_unlock_bh(&bat_priv->gw.list_lock);
-
-	/* gw_reselect() needs to acquire the gw_list_lock */
-	if (do_reselect)
-		batadv_gw_reselect(bat_priv);
-
-	if (curr_gw)
-		batadv_gw_node_free_ref(curr_gw);
 }
 
 /* fails if orig_node has no router */
@@ -654,9 +631,6 @@ int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
-		if (gw_node->deleted)
-			continue;
-
 		/* fails if orig_node has no router */
 		if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0)
 			continue;

net/batman-adv/gateway_client.h

@@ -38,7 +38,7 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
 			   struct batadv_tvlv_gateway_data *gateway);
 void batadv_gw_node_delete(struct batadv_priv *bat_priv,
 			   struct batadv_orig_node *orig_node);
-void batadv_gw_node_purge(struct batadv_priv *bat_priv);
+void batadv_gw_node_free(struct batadv_priv *bat_priv);
 int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset);
 bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, struct sk_buff *skb);
 enum batadv_dhcp_recipient

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);
 

net/batman-adv/main.c

@@ -199,7 +199,7 @@ void batadv_mesh_free(struct net_device *soft_iface)
 
 	batadv_purge_outstanding_packets(bat_priv, NULL);
 
-	batadv_gw_node_purge(bat_priv);
+	batadv_gw_node_free(bat_priv);
 	batadv_nc_mesh_free(bat_priv);
 	batadv_dat_free(bat_priv);
 	batadv_bla_free(bat_priv);

net/batman-adv/main.h

@@ -24,7 +24,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2015.1"
+#define BATADV_SOURCE_VERSION "2015.2"
 #endif
 
 /* B.A.T.M.A.N. parameters */

net/batman-adv/originator.c

@@ -442,40 +442,6 @@ out:
 	return neigh_ifinfo;
 }
 
-/**
- * batadv_neigh_node_new - create and init a new neigh_node object
- * @hard_iface: the interface where the neighbour is connected to
- * @neigh_addr: the mac address of the neighbour interface
- * @orig_node: originator object representing the neighbour
- *
- * Allocates a new neigh_node object and initialises all the generic fields.
- * Returns the new object or NULL on failure.
- */
-struct batadv_neigh_node *
-batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
-		      const u8 *neigh_addr, struct batadv_orig_node *orig_node)
-{
-	struct batadv_neigh_node *neigh_node;
-
-	neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
-	if (!neigh_node)
-		goto out;
-
-	INIT_HLIST_NODE(&neigh_node->list);
-	INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
-	spin_lock_init(&neigh_node->ifinfo_lock);
-
-	ether_addr_copy(neigh_node->addr, neigh_addr);
-	neigh_node->if_incoming = hard_iface;
-	neigh_node->orig_node = orig_node;
-
-	/* extra reference for return */
-	atomic_set(&neigh_node->refcount, 2);
-
-out:
-	return neigh_node;
-}
-
 /**
  * batadv_neigh_node_get - retrieve a neighbour from the list
  * @orig_node: originator which the neighbour belongs to
@@ -486,7 +452,7 @@ out:
  * which is connected through the provided hard interface.
  * Returns NULL if the neighbour is not found.
  */
-struct batadv_neigh_node *
+static struct batadv_neigh_node *
 batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 		      const struct batadv_hard_iface *hard_iface,
 		      const u8 *addr)
@@ -512,6 +478,59 @@ batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
 	return res;
 }
 
+/**
+ * batadv_neigh_node_new - create and init a new neigh_node object
+ * @orig_node: originator object representing the neighbour
+ * @hard_iface: the interface where the neighbour is connected to
+ * @neigh_addr: the mac address of the neighbour interface
+ *
+ * Allocates a new neigh_node object and initialises all the generic fields.
+ * Returns the new object or NULL on failure.
+ */
+struct batadv_neigh_node *
+batadv_neigh_node_new(struct batadv_orig_node *orig_node,
+		      struct batadv_hard_iface *hard_iface,
+		      const u8 *neigh_addr)
+{
+	struct batadv_neigh_node *neigh_node;
+
+	neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
+	if (neigh_node)
+		goto out;
+
+	neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
+	if (!neigh_node)
+		goto out;
+
+	if (!atomic_inc_not_zero(&hard_iface->refcount)) {
+		kfree(neigh_node);
+		neigh_node = NULL;
+		goto out;
+	}
+
+	INIT_HLIST_NODE(&neigh_node->list);
+	INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
+	spin_lock_init(&neigh_node->ifinfo_lock);
+
+	ether_addr_copy(neigh_node->addr, neigh_addr);
+	neigh_node->if_incoming = hard_iface;
+	neigh_node->orig_node = orig_node;
+
+	/* extra reference for return */
+	atomic_set(&neigh_node->refcount, 2);
+
+	spin_lock_bh(&orig_node->neigh_list_lock);
+	hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
+	spin_unlock_bh(&orig_node->neigh_list_lock);
+
+	batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
+		   "Creating new neighbor %pM for orig_node %pM on interface %s\n",
+		   neigh_addr, orig_node->orig, hard_iface->net_dev->name);
+
+out:
+	return neigh_node;
+}
+
 /**
  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
  * @rcu: rcu pointer of the orig_ifinfo object
@@ -1010,7 +1029,6 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 		spin_unlock_bh(list_lock);
 	}
 
-	batadv_gw_node_purge(bat_priv);
 	batadv_gw_election(bat_priv);
 }
 

net/batman-adv/originator.h

@@ -42,12 +42,9 @@ void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node);
 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 					      const u8 *addr);
 struct batadv_neigh_node *
-batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
+batadv_neigh_node_new(struct batadv_orig_node *orig_node,
-		      const struct batadv_hard_iface *hard_iface,
+		      struct batadv_hard_iface *hard_iface,
-		      const u8 *addr);
+		      const u8 *neigh_addr);
-struct batadv_neigh_node *
-batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
-		      const u8 *neigh_addr, struct batadv_orig_node *orig_node);
 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node);
 struct batadv_neigh_node *
 batadv_orig_router_get(struct batadv_orig_node *orig_node,

net/batman-adv/soft-interface.c

@@ -947,8 +947,6 @@ static void batadv_softif_init_early(struct net_device *dev)
 	 * have not been initialized yet
 	 */
 	dev->mtu = ETH_DATA_LEN;
-	/* reserve more space in the skbuff for our header */
-	dev->hard_header_len = batadv_max_header_len();
 
 	/* generate random address */
 	eth_hw_addr_random(dev);

net/batman-adv/types.h

@@ -328,7 +328,6 @@ enum batadv_orig_capabilities {
  * @orig_node: pointer to corresponding orig node
  * @bandwidth_down: advertised uplink download bandwidth
  * @bandwidth_up: advertised uplink upload bandwidth
- * @deleted: this struct is scheduled for deletion
  * @refcount: number of contexts the object is used
  * @rcu: struct used for freeing in an RCU-safe manner
  */
@@ -337,7 +336,6 @@ struct batadv_gw_node {
 	struct batadv_orig_node *orig_node;
 	u32 bandwidth_down;
 	u32 bandwidth_up;
-	unsigned long deleted;
 	atomic_t refcount;
 	struct rcu_head rcu;
 };