Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-merge

net/batman-adv/gateway_client.c

@@ -23,6 +23,7 @@
 #include "gateway_client.h"
 #include "gateway_common.h"
 #include "hard-interface.h"
+#include "originator.h"
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/udp.h>
@@ -42,61 +43,76 @@ static void gw_node_free_ref(struct gw_node *gw_node)
 		call_rcu(&gw_node->rcu, gw_node_free_rcu);
 }
 
-void *gw_get_selected(struct bat_priv *bat_priv)
+static struct gw_node *gw_get_selected_gw_node(struct bat_priv *bat_priv)
 {
-	struct gw_node *curr_gateway_tmp;
-	struct orig_node *orig_node = NULL;
+	struct gw_node *gw_node;
 
 	rcu_read_lock();
-	curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
-	if (!curr_gateway_tmp)
-		goto out;
-
-	orig_node = curr_gateway_tmp->orig_node;
-	if (!orig_node)
+	gw_node = rcu_dereference(bat_priv->curr_gw);
+	if (!gw_node)
 		goto out;
 
-	if (!atomic_inc_not_zero(&orig_node->refcount))
-		orig_node = NULL;
+	if (!atomic_inc_not_zero(&gw_node->refcount))
+		gw_node = NULL;
 
 out:
 	rcu_read_unlock();
-	return orig_node;
+	return gw_node;
 }
 
-void gw_deselect(struct bat_priv *bat_priv)
+struct orig_node *gw_get_selected_orig(struct bat_priv *bat_priv)
 {
 	struct gw_node *gw_node;
+	struct orig_node *orig_node = NULL;
 
-	spin_lock_bh(&bat_priv->gw_list_lock);
-	gw_node = rcu_dereference(bat_priv->curr_gw);
-	rcu_assign_pointer(bat_priv->curr_gw, NULL);
-	spin_unlock_bh(&bat_priv->gw_list_lock);
+	gw_node = gw_get_selected_gw_node(bat_priv);
+	if (!gw_node)
+		goto out;
+
+	rcu_read_lock();
+	orig_node = gw_node->orig_node;
+	if (!orig_node)
+		goto unlock;
+
+	if (!atomic_inc_not_zero(&orig_node->refcount))
+		orig_node = NULL;
 
+unlock:
+	rcu_read_unlock();
+out:
 	if (gw_node)
 		gw_node_free_ref(gw_node);
+	return orig_node;
 }
 
 static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
 {
 	struct gw_node *curr_gw_node;
 
+	spin_lock_bh(&bat_priv->gw_list_lock);
+
 	if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
 		new_gw_node = NULL;
 
-	spin_lock_bh(&bat_priv->gw_list_lock);
-	curr_gw_node = rcu_dereference(bat_priv->curr_gw);
+	curr_gw_node = bat_priv->curr_gw;
 	rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
-	spin_unlock_bh(&bat_priv->gw_list_lock);
 
 	if (curr_gw_node)
 		gw_node_free_ref(curr_gw_node);
+
+	spin_unlock_bh(&bat_priv->gw_list_lock);
+}
+
+void gw_deselect(struct bat_priv *bat_priv)
+{
+	gw_select(bat_priv, NULL);
 }
 
 void gw_election(struct bat_priv *bat_priv)
 {
 	struct hlist_node *node;
-	struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL;
+	struct gw_node *gw_node, *curr_gw = NULL, *curr_gw_tmp = NULL;
+	struct neigh_node *router;
 	uint8_t max_tq = 0;
 	uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
 	int down, up;
@@ -110,32 +126,25 @@ void gw_election(struct bat_priv *bat_priv)
 	if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
 		return;
 
-	rcu_read_lock();
-	curr_gw = rcu_dereference(bat_priv->curr_gw);
-	if (curr_gw) {
-		rcu_read_unlock();
-		return;
-	}
+	curr_gw = gw_get_selected_gw_node(bat_priv);
+	if (!curr_gw)
+		goto out;
 
+	rcu_read_lock();
 	if (hlist_empty(&bat_priv->gw_list)) {
-
-		if (curr_gw) {
-			rcu_read_unlock();
-			bat_dbg(DBG_BATMAN, bat_priv,
-				"Removing selected gateway - "
-				"no gateway in range\n");
-			gw_deselect(bat_priv);
-		} else
-			rcu_read_unlock();
-
-		return;
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Removing selected gateway - "
+			"no gateway in range\n");
+		gw_deselect(bat_priv);
+		goto unlock;
 	}
 
 	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
-		if (!gw_node->orig_node->router)
+		if (gw_node->deleted)
 			continue;
 
-		if (gw_node->deleted)
+		router = orig_node_get_router(gw_node->orig_node);
+		if (!router)
 			continue;
 
 		switch (atomic_read(&bat_priv->gw_sel_class)) {
@@ -143,15 +152,14 @@ void gw_election(struct bat_priv *bat_priv)
 			gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
 					     &down, &up);
 
-			tmp_gw_factor = (gw_node->orig_node->router->tq_avg *
-					 gw_node->orig_node->router->tq_avg *
+			tmp_gw_factor = (router->tq_avg * router->tq_avg *
 					 down * 100 * 100) /
 					 (TQ_LOCAL_WINDOW_SIZE *
 					 TQ_LOCAL_WINDOW_SIZE * 64);
 
 			if ((tmp_gw_factor > max_gw_factor) ||
 			    ((tmp_gw_factor == max_gw_factor) &&
-			     (gw_node->orig_node->router->tq_avg > max_tq)))
+			     (router->tq_avg > max_tq)))
 				curr_gw_tmp = gw_node;
 			break;
 
@@ -163,19 +171,25 @@ void gw_election(struct bat_priv *bat_priv)
 			  *     soon as a better gateway appears which has
 			  *     $routing_class more tq points)
 			  **/
-			if (gw_node->orig_node->router->tq_avg > max_tq)
+			if (router->tq_avg > max_tq)
 				curr_gw_tmp = gw_node;
 			break;
 		}
 
-		if (gw_node->orig_node->router->tq_avg > max_tq)
-			max_tq = gw_node->orig_node->router->tq_avg;
+		if (router->tq_avg > max_tq)
+			max_tq = router->tq_avg;
 
 		if (tmp_gw_factor > max_gw_factor)
 			max_gw_factor = tmp_gw_factor;
+
+		neigh_node_free_ref(router);
 	}
 
 	if (curr_gw != curr_gw_tmp) {
+		router = orig_node_get_router(curr_gw_tmp->orig_node);
+		if (!router)
+			goto unlock;
+
 		if ((curr_gw) && (!curr_gw_tmp))
 			bat_dbg(DBG_BATMAN, bat_priv,
 				"Removing selected gateway - "
@@ -186,48 +200,50 @@ void gw_election(struct bat_priv *bat_priv)
 				"(gw_flags: %i, tq: %i)\n",
 				curr_gw_tmp->orig_node->orig,
 				curr_gw_tmp->orig_node->gw_flags,
-				curr_gw_tmp->orig_node->router->tq_avg);
+				router->tq_avg);
 		else
 			bat_dbg(DBG_BATMAN, bat_priv,
 				"Changing route to gateway %pM "
 				"(gw_flags: %i, tq: %i)\n",
 				curr_gw_tmp->orig_node->orig,
 				curr_gw_tmp->orig_node->gw_flags,
-				curr_gw_tmp->orig_node->router->tq_avg);
+				router->tq_avg);
 
+		neigh_node_free_ref(router);
 		gw_select(bat_priv, curr_gw_tmp);
 	}
 
+unlock:
 	rcu_read_unlock();
+out:
+	if (curr_gw)
+		gw_node_free_ref(curr_gw);
 }
 
 void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
 {
-	struct gw_node *curr_gateway_tmp;
+	struct orig_node *curr_gw_orig;
+	struct neigh_node *router_gw = NULL, *router_orig = NULL;
 	uint8_t gw_tq_avg, orig_tq_avg;
 
-	rcu_read_lock();
-	curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
-	if (!curr_gateway_tmp)
-		goto out_rcu;
+	curr_gw_orig = gw_get_selected_orig(bat_priv);
+	if (!curr_gw_orig)
+		goto deselect;
 
-	if (!curr_gateway_tmp->orig_node)
-		goto deselect_rcu;
-
-	if (!curr_gateway_tmp->orig_node->router)
-		goto deselect_rcu;
+	router_gw = orig_node_get_router(curr_gw_orig);
+	if (!router_gw)
+		goto deselect;
 
 	/* this node already is the gateway */
-	if (curr_gateway_tmp->orig_node == orig_node)
-		goto out_rcu;
-
-	if (!orig_node->router)
-		goto out_rcu;
+	if (curr_gw_orig == orig_node)
+		goto out;
 
-	gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg;
-	rcu_read_unlock();
+	router_orig = orig_node_get_router(orig_node);
+	if (!router_orig)
+		goto out;
 
-	orig_tq_avg = orig_node->router->tq_avg;
+	gw_tq_avg = router_gw->tq_avg;
+	orig_tq_avg = router_orig->tq_avg;
 
 	/* the TQ value has to be better */
 	if (orig_tq_avg < gw_tq_avg)
@@ -245,16 +261,17 @@ void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
 		"Restarting gateway selection: better gateway found (tq curr: "
 		"%i, tq new: %i)\n",
 		gw_tq_avg, orig_tq_avg);
-	goto deselect;
 
-out_rcu:
-	rcu_read_unlock();
-	goto out;
-deselect_rcu:
-	rcu_read_unlock();
 deselect:
 	gw_deselect(bat_priv);
 out:
+	if (curr_gw_orig)
+		orig_node_free_ref(curr_gw_orig);
+	if (router_gw)
+		neigh_node_free_ref(router_gw);
+	if (router_orig)
+		neigh_node_free_ref(router_orig);
+
 	return;
 }
 
@@ -291,7 +308,11 @@ void gw_node_update(struct bat_priv *bat_priv,
 		    struct orig_node *orig_node, uint8_t new_gwflags)
 {
 	struct hlist_node *node;
-	struct gw_node *gw_node;
+	struct gw_node *gw_node, *curr_gw;
+
+	curr_gw = gw_get_selected_gw_node(bat_priv);
+	if (!curr_gw)
+		goto out;
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
@@ -312,22 +333,26 @@ void gw_node_update(struct bat_priv *bat_priv,
 				"Gateway %pM removed from gateway list\n",
 				orig_node->orig);
 
-			if (gw_node == rcu_dereference(bat_priv->curr_gw)) {
-				rcu_read_unlock();
-				gw_deselect(bat_priv);
-				return;
-			}
+			if (gw_node == curr_gw)
+				goto deselect;
 		}
 
-		rcu_read_unlock();
-		return;
+		goto unlock;
 	}
-	rcu_read_unlock();
 
 	if (new_gwflags == 0)
-		return;
+		goto unlock;
 
 	gw_node_add(bat_priv, orig_node, new_gwflags);
+	goto unlock;
+
+deselect:
+	gw_deselect(bat_priv);
+unlock:
+	rcu_read_unlock();
+out:
+	if (curr_gw)
+		gw_node_free_ref(curr_gw);
 }
 
 void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
@@ -337,9 +362,12 @@ void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
 
 void gw_node_purge(struct bat_priv *bat_priv)
 {
-	struct gw_node *gw_node;
+	struct gw_node *gw_node, *curr_gw;
 	struct hlist_node *node, *node_tmp;
 	unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
+	char do_deselect = 0;
+
+	curr_gw = gw_get_selected_gw_node(bat_priv);
 
 	spin_lock_bh(&bat_priv->gw_list_lock);
 
@@ -350,41 +378,56 @@ void gw_node_purge(struct bat_priv *bat_priv)
 		    atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
 			continue;
 
-		if (rcu_dereference(bat_priv->curr_gw) == gw_node)
-			gw_deselect(bat_priv);
+		if (curr_gw == gw_node)
+			do_deselect = 1;
 
 		hlist_del_rcu(&gw_node->list);
 		gw_node_free_ref(gw_node);
 	}
 
-
 	spin_unlock_bh(&bat_priv->gw_list_lock);
+
+	/* gw_deselect() needs to acquire the gw_list_lock */
+	if (do_deselect)
+		gw_deselect(bat_priv);
+
+	if (curr_gw)
+		gw_node_free_ref(curr_gw);
 }
 
+/**
+ * fails if orig_node has no router
+ */
 static int _write_buffer_text(struct bat_priv *bat_priv,
 			      struct seq_file *seq, struct gw_node *gw_node)
 {
 	struct gw_node *curr_gw;
-	int down, up, ret;
+	struct neigh_node *router;
+	int down, up, ret = -1;
 
 	gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
 
-	rcu_read_lock();
-	curr_gw = rcu_dereference(bat_priv->curr_gw);
+	router = orig_node_get_router(gw_node->orig_node);
+	if (!router)
+		goto out;
 
-	ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
-		       (curr_gw == gw_node ? "=>" : "  "),
-		       gw_node->orig_node->orig,
-		       gw_node->orig_node->router->tq_avg,
-		       gw_node->orig_node->router->addr,
-		       gw_node->orig_node->router->if_incoming->net_dev->name,
-		       gw_node->orig_node->gw_flags,
-		       (down > 2048 ? down / 1024 : down),
-		       (down > 2048 ? "MBit" : "KBit"),
-		       (up > 2048 ? up / 1024 : up),
-		       (up > 2048 ? "MBit" : "KBit"));
+	curr_gw = gw_get_selected_gw_node(bat_priv);
 
-	rcu_read_unlock();
+	ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
+			 (curr_gw == gw_node ? "=>" : "  "),
+			 gw_node->orig_node->orig,
+			 router->tq_avg, router->addr,
+			 router->if_incoming->net_dev->name,
+			 gw_node->orig_node->gw_flags,
+			 (down > 2048 ? down / 1024 : down),
+			 (down > 2048 ? "MBit" : "KBit"),
+			 (up > 2048 ? up / 1024 : up),
+			 (up > 2048 ? "MBit" : "KBit"));
+
+	neigh_node_free_ref(router);
+	if (curr_gw)
+		gw_node_free_ref(curr_gw);
+out:
 	return ret;
 }
 
@@ -422,10 +465,10 @@ int gw_client_seq_print_text(struct seq_file *seq, void *offset)
 		if (gw_node->deleted)
 			continue;
 
-		if (!gw_node->orig_node->router)
+		/* fails if orig_node has no router */
+		if (_write_buffer_text(bat_priv, seq, gw_node) < 0)
 			continue;
 
-		_write_buffer_text(bat_priv, seq, gw_node);
 		gw_count++;
 	}
 	rcu_read_unlock();
@@ -442,6 +485,7 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
 	struct iphdr *iphdr;
 	struct ipv6hdr *ipv6hdr;
 	struct udphdr *udphdr;
+	struct gw_node *curr_gw;
 	unsigned int header_len = 0;
 
 	if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF)
@@ -506,12 +550,11 @@ int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
 	if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)
 		return -1;
 
-	rcu_read_lock();
-	if (!rcu_dereference(bat_priv->curr_gw)) {
-		rcu_read_unlock();
+	curr_gw = gw_get_selected_gw_node(bat_priv);
+	if (!curr_gw)
 		return 0;
-	}
-	rcu_read_unlock();
 
+	if (curr_gw)
+		gw_node_free_ref(curr_gw);
 	return 1;
 }

net/batman-adv/gateway_client.h

@@ -24,7 +24,7 @@
 
 void gw_deselect(struct bat_priv *bat_priv);
 void gw_election(struct bat_priv *bat_priv);
-void *gw_get_selected(struct bat_priv *bat_priv);
+struct orig_node *gw_get_selected_orig(struct bat_priv *bat_priv);
 void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node);
 void gw_node_update(struct bat_priv *bat_priv,
 		    struct orig_node *orig_node, uint8_t new_gwflags);

net/batman-adv/icmp_socket.c

@@ -218,23 +218,13 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
 	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
 		goto dst_unreach;
 
-	rcu_read_lock();
 	orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
-
 	if (!orig_node)
-		goto unlock;
-
-	neigh_node = orig_node->router;
+		goto dst_unreach;
 
+	neigh_node = orig_node_get_router(orig_node);
 	if (!neigh_node)
-		goto unlock;
-
-	if (!atomic_inc_not_zero(&neigh_node->refcount)) {
-		neigh_node = NULL;
-		goto unlock;
-	}
-
-	rcu_read_unlock();
+		goto dst_unreach;
 
 	if (!neigh_node->if_incoming)
 		goto dst_unreach;
@@ -252,8 +242,6 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
 	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
 	goto out;
 
-unlock:
-	rcu_read_unlock();
 dst_unreach:
 	icmp_packet->msg_type = DESTINATION_UNREACHABLE;
 	bat_socket_add_packet(socket_client, icmp_packet, packet_len);

net/batman-adv/originator.c

@@ -70,6 +70,21 @@ void neigh_node_free_ref(struct neigh_node *neigh_node)
 		call_rcu(&neigh_node->rcu, neigh_node_free_rcu);
 }
 
+/* increases the refcounter of a found router */
+struct neigh_node *orig_node_get_router(struct orig_node *orig_node)
+{
+	struct neigh_node *router;
+
+	rcu_read_lock();
+	router = rcu_dereference(orig_node->router);
+
+	if (router && !atomic_inc_not_zero(&router->refcount))
+		router = NULL;
+
+	rcu_read_unlock();
+	return router;
+}
+
 struct neigh_node *create_neighbor(struct orig_node *orig_node,
 				   struct orig_node *orig_neigh_node,
 				   uint8_t *neigh,
@@ -87,6 +102,7 @@ struct neigh_node *create_neighbor(struct orig_node *orig_node,
 
 	INIT_HLIST_NODE(&neigh_node->list);
 	INIT_LIST_HEAD(&neigh_node->bonding_list);
+	spin_lock_init(&neigh_node->tq_lock);
 
 	memcpy(neigh_node->addr, neigh, ETH_ALEN);
 	neigh_node->orig_node = orig_neigh_node;
@@ -390,7 +406,7 @@ int orig_seq_print_text(struct seq_file *seq, void *offset)
 	struct hlist_node *node, *node_tmp;
 	struct hlist_head *head;
 	struct orig_node *orig_node;
-	struct neigh_node *neigh_node;
+	struct neigh_node *neigh_node, *neigh_node_tmp;
 	int batman_count = 0;
 	int last_seen_secs;
 	int last_seen_msecs;
@@ -421,37 +437,41 @@ int orig_seq_print_text(struct seq_file *seq, void *offset)
 
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
-			if (!orig_node->router)
+			neigh_node = orig_node_get_router(orig_node);
+			if (!neigh_node)
 				continue;
 
-			if (orig_node->router->tq_avg == 0)
-				continue;
+			if (neigh_node->tq_avg == 0)
+				goto next;
 
 			last_seen_secs = jiffies_to_msecs(jiffies -
 						orig_node->last_valid) / 1000;
 			last_seen_msecs = jiffies_to_msecs(jiffies -
 						orig_node->last_valid) % 1000;
 
-			neigh_node = orig_node->router;
 			seq_printf(seq, "%pM %4i.%03is   (%3i) %pM [%10s]:",
 				   orig_node->orig, last_seen_secs,
 				   last_seen_msecs, neigh_node->tq_avg,
 				   neigh_node->addr,
 				   neigh_node->if_incoming->net_dev->name);
 
-			hlist_for_each_entry_rcu(neigh_node, node_tmp,
+			hlist_for_each_entry_rcu(neigh_node_tmp, node_tmp,
 						 &orig_node->neigh_list, list) {
-				seq_printf(seq, " %pM (%3i)", neigh_node->addr,
-						neigh_node->tq_avg);
+				seq_printf(seq, " %pM (%3i)",
+					   neigh_node_tmp->addr,
+					   neigh_node_tmp->tq_avg);
 			}
 
 			seq_printf(seq, "\n");
 			batman_count++;
+
+next:
+			neigh_node_free_ref(neigh_node);
 		}
 		rcu_read_unlock();
 	}
 
-	if ((batman_count == 0))
+	if (batman_count == 0)
 		seq_printf(seq, "No batman nodes in range ...\n");
 
 	return 0;

net/batman-adv/originator.h

@@ -34,6 +34,7 @@ struct neigh_node *create_neighbor(struct orig_node *orig_node,
 				   uint8_t *neigh,
 				   struct hard_iface *if_incoming);
 void neigh_node_free_ref(struct neigh_node *neigh_node);
+struct neigh_node *orig_node_get_router(struct orig_node *orig_node);
 int orig_seq_print_text(struct seq_file *seq, void *offset);
 int orig_hash_add_if(struct hard_iface *hard_iface, int max_if_num);
 int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num);

net/batman-adv/routing.c

@@ -87,18 +87,20 @@ static void update_route(struct bat_priv *bat_priv,
 			 struct neigh_node *neigh_node,
 			 unsigned char *hna_buff, int hna_buff_len)
 {
-	struct neigh_node *neigh_node_tmp;
+	struct neigh_node *curr_router;
+
+	curr_router = orig_node_get_router(orig_node);
 
 	/* route deleted */
-	if ((orig_node->router) && (!neigh_node)) {
+	if ((curr_router) && (!neigh_node)) {
 
 		bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
 			orig_node->orig);
 		hna_global_del_orig(bat_priv, orig_node,
 				    "originator timed out");
 
-		/* route added */
-	} else if ((!orig_node->router) && (neigh_node)) {
+	/* route added */
+	} else if ((!curr_router) && (neigh_node)) {
 
 		bat_dbg(DBG_ROUTES, bat_priv,
 			"Adding route towards: %pM (via %pM)\n",
@@ -106,21 +108,29 @@ static void update_route(struct bat_priv *bat_priv,
 		hna_global_add_orig(bat_priv, orig_node,
 				    hna_buff, hna_buff_len);
 
-		/* route changed */
+	/* route changed */
 	} else {
 		bat_dbg(DBG_ROUTES, bat_priv,
 			"Changing route towards: %pM "
 			"(now via %pM - was via %pM)\n",
 			orig_node->orig, neigh_node->addr,
-			orig_node->router->addr);
+			curr_router->addr);
 	}
 
+	if (curr_router)
+		neigh_node_free_ref(curr_router);
+
+	/* increase refcount of new best neighbor */
 	if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
 		neigh_node = NULL;
-	neigh_node_tmp = orig_node->router;
-	orig_node->router = neigh_node;
-	if (neigh_node_tmp)
-		neigh_node_free_ref(neigh_node_tmp);
+
+	spin_lock_bh(&orig_node->neigh_list_lock);
+	rcu_assign_pointer(orig_node->router, neigh_node);
+	spin_unlock_bh(&orig_node->neigh_list_lock);
+
+	/* decrease refcount of previous best neighbor */
+	if (curr_router)
+		neigh_node_free_ref(curr_router);
 }
 
 
@@ -128,16 +138,23 @@ void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
 		   struct neigh_node *neigh_node, unsigned char *hna_buff,
 		   int hna_buff_len)
 {
+	struct neigh_node *router = NULL;
 
 	if (!orig_node)
-		return;
+		goto out;
+
+	router = orig_node_get_router(orig_node);
 
-	if (orig_node->router != neigh_node)
+	if (router != neigh_node)
 		update_route(bat_priv, orig_node, neigh_node,
 			     hna_buff, hna_buff_len);
 	/* may be just HNA changed */
 	else
 		update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
+
+out:
+	if (router)
+		neigh_node_free_ref(router);
 }
 
 static int is_bidirectional_neigh(struct orig_node *orig_node,
@@ -288,8 +305,8 @@ static void bonding_candidate_add(struct orig_node *orig_node,
 				  struct neigh_node *neigh_node)
 {
 	struct hlist_node *node;
-	struct neigh_node *tmp_neigh_node;
-	uint8_t best_tq, interference_candidate = 0;
+	struct neigh_node *tmp_neigh_node, *router = NULL;
+	uint8_t interference_candidate = 0;
 
 	spin_lock_bh(&orig_node->neigh_list_lock);
 
@@ -298,13 +315,12 @@ static void bonding_candidate_add(struct orig_node *orig_node,
 			 neigh_node->orig_node->primary_addr))
 		goto candidate_del;
 
-	if (!orig_node->router)
+	router = orig_node_get_router(orig_node);
+	if (!router)
 		goto candidate_del;
 
-	best_tq = orig_node->router->tq_avg;
-
 	/* ... and is good enough to be considered */
-	if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
+	if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD)
 		goto candidate_del;
 
 	/**
@@ -350,7 +366,9 @@ candidate_del:
 
 out:
 	spin_unlock_bh(&orig_node->neigh_list_lock);
-	return;
+
+	if (router)
+		neigh_node_free_ref(router);
 }
 
 /* copy primary address for bonding */
@@ -373,6 +391,7 @@ static void update_orig(struct bat_priv *bat_priv,
 			char is_duplicate)
 {
 	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+	struct neigh_node *router = NULL;
 	struct orig_node *orig_node_tmp;
 	struct hlist_node *node;
 	int tmp_hna_buff_len;
@@ -396,10 +415,12 @@ static void update_orig(struct bat_priv *bat_priv,
 		if (is_duplicate)
 			continue;
 
+		spin_lock_bh(&tmp_neigh_node->tq_lock);
 		ring_buffer_set(tmp_neigh_node->tq_recv,
 				&tmp_neigh_node->tq_index, 0);
 		tmp_neigh_node->tq_avg =
 			ring_buffer_avg(tmp_neigh_node->tq_recv);
+		spin_unlock_bh(&tmp_neigh_node->tq_lock);
 	}
 
 	if (!neigh_node) {
@@ -424,10 +445,12 @@ static void update_orig(struct bat_priv *bat_priv,
 	orig_node->flags = batman_packet->flags;
 	neigh_node->last_valid = jiffies;
 
+	spin_lock_bh(&neigh_node->tq_lock);
 	ring_buffer_set(neigh_node->tq_recv,
 			&neigh_node->tq_index,
 			batman_packet->tq);
 	neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
+	spin_unlock_bh(&neigh_node->tq_lock);
 
 	if (!is_duplicate) {
 		orig_node->last_ttl = batman_packet->ttl;
@@ -441,19 +464,18 @@ static void update_orig(struct bat_priv *bat_priv,
 
 	/* if this neighbor already is our next hop there is nothing
 	 * to change */
-	if (orig_node->router == neigh_node)
+	router = orig_node_get_router(orig_node);
+	if (router == neigh_node)
 		goto update_hna;
 
 	/* if this neighbor does not offer a better TQ we won't consider it */
-	if ((orig_node->router) &&
-	    (orig_node->router->tq_avg > neigh_node->tq_avg))
+	if (router && (router->tq_avg > neigh_node->tq_avg))
 		goto update_hna;
 
 	/* if the TQ is the same and the link not more symetric we
 	 * won't consider it either */
-	if ((orig_node->router) &&
-	     (neigh_node->tq_avg == orig_node->router->tq_avg)) {
-		orig_node_tmp = orig_node->router->orig_node;
+	if (router && (neigh_node->tq_avg == router->tq_avg)) {
+		orig_node_tmp = router->orig_node;
 		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 		bcast_own_sum_orig =
 			orig_node_tmp->bcast_own_sum[if_incoming->if_num];
@@ -474,7 +496,7 @@ static void update_orig(struct bat_priv *bat_priv,
 	goto update_gw;
 
 update_hna:
-	update_routes(bat_priv, orig_node, orig_node->router,
+	update_routes(bat_priv, orig_node, router,
 		      hna_buff, tmp_hna_buff_len);
 
 update_gw:
@@ -496,6 +518,8 @@ unlock:
 out:
 	if (neigh_node)
 		neigh_node_free_ref(neigh_node);
+	if (router)
+		neigh_node_free_ref(router);
 }
 
 /* checks whether the host restarted and is in the protection time.
@@ -603,6 +627,8 @@ void receive_bat_packet(struct ethhdr *ethhdr,
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 	struct hard_iface *hard_iface;
 	struct orig_node *orig_neigh_node, *orig_node;
+	struct neigh_node *router = NULL, *router_router = NULL;
+	struct neigh_node *orig_neigh_router = NULL;
 	char has_directlink_flag;
 	char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 	char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
@@ -747,14 +773,15 @@ void receive_bat_packet(struct ethhdr *ethhdr,
 		goto out;
 	}
 
+	router = orig_node_get_router(orig_node);
+	if (router)
+		router_router = orig_node_get_router(router->orig_node);
+
 	/* avoid temporary routing loops */
-	if ((orig_node->router) &&
-	    (orig_node->router->orig_node->router) &&
-	    (compare_eth(orig_node->router->addr,
-			 batman_packet->prev_sender)) &&
+	if (router && router_router &&
+	    (compare_eth(router->addr, batman_packet->prev_sender)) &&
 	    !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) &&
-	    (compare_eth(orig_node->router->addr,
-			 orig_node->router->orig_node->router->addr))) {
+	    (compare_eth(router->addr, router_router->addr))) {
 		bat_dbg(DBG_BATMAN, bat_priv,
 			"Drop packet: ignoring all rebroadcast packets that "
 			"may make me loop (sender: %pM)\n", ethhdr->h_source);
@@ -769,9 +796,11 @@ void receive_bat_packet(struct ethhdr *ethhdr,
 	if (!orig_neigh_node)
 		goto out;
 
+	orig_neigh_router = orig_node_get_router(orig_neigh_node);
+
 	/* drop packet if sender is not a direct neighbor and if we
 	 * don't route towards it */
-	if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
+	if (!is_single_hop_neigh && (!orig_neigh_router)) {
 		bat_dbg(DBG_BATMAN, bat_priv,
 			"Drop packet: OGM via unknown neighbor!\n");
 		goto out_neigh;
@@ -825,6 +854,13 @@ out_neigh:
 	if ((orig_neigh_node) && (!is_single_hop_neigh))
 		orig_node_free_ref(orig_neigh_node);
 out:
+	if (router)
+		neigh_node_free_ref(router);
+	if (router_router)
+		neigh_node_free_ref(router_router);
+	if (orig_neigh_router)
+		neigh_node_free_ref(orig_neigh_router);
+
 	orig_node_free_ref(orig_node);
 }
 
@@ -869,7 +905,7 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 			       struct sk_buff *skb, size_t icmp_len)
 {
 	struct orig_node *orig_node = NULL;
-	struct neigh_node *neigh_node = NULL;
+	struct neigh_node *router = NULL;
 	struct icmp_packet_rr *icmp_packet;
 	int ret = NET_RX_DROP;
 
@@ -886,23 +922,13 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 
 	/* answer echo request (ping) */
 	/* get routing information */
-	rcu_read_lock();
 	orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
-
 	if (!orig_node)
-		goto unlock;
-
-	neigh_node = orig_node->router;
-
-	if (!neigh_node)
-		goto unlock;
-
-	if (!atomic_inc_not_zero(&neigh_node->refcount)) {
-		neigh_node = NULL;
-		goto unlock;
-	}
+		goto out;
 
-	rcu_read_unlock();
+	router = orig_node_get_router(orig_node);
+	if (!router)
+		goto out;
 
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
@@ -916,15 +942,12 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
 	icmp_packet->msg_type = ECHO_REPLY;
 	icmp_packet->ttl = TTL;
 
-	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+	send_skb_packet(skb, router->if_incoming, router->addr);
 	ret = NET_RX_SUCCESS;
-	goto out;
 
-unlock:
-	rcu_read_unlock();
 out:
-	if (neigh_node)
-		neigh_node_free_ref(neigh_node);
+	if (router)
+		neigh_node_free_ref(router);
 	if (orig_node)
 		orig_node_free_ref(orig_node);
 	return ret;
@@ -934,7 +957,7 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 				  struct sk_buff *skb)
 {
 	struct orig_node *orig_node = NULL;
-	struct neigh_node *neigh_node = NULL;
+	struct neigh_node *router = NULL;
 	struct icmp_packet *icmp_packet;
 	int ret = NET_RX_DROP;
 
@@ -952,23 +975,13 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 		goto out;
 
 	/* get routing information */
-	rcu_read_lock();
 	orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
-
 	if (!orig_node)
-		goto unlock;
-
-	neigh_node = orig_node->router;
-
-	if (!neigh_node)
-		goto unlock;
-
-	if (!atomic_inc_not_zero(&neigh_node->refcount)) {
-		neigh_node = NULL;
-		goto unlock;
-	}
+		goto out;
 
-	rcu_read_unlock();
+	router = orig_node_get_router(orig_node);
+	if (!router)
+		goto out;
 
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
@@ -982,15 +995,12 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
 	icmp_packet->msg_type = TTL_EXCEEDED;
 	icmp_packet->ttl = TTL;
 
-	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+	send_skb_packet(skb, router->if_incoming, router->addr);
 	ret = NET_RX_SUCCESS;
-	goto out;
 
-unlock:
-	rcu_read_unlock();
 out:
-	if (neigh_node)
-		neigh_node_free_ref(neigh_node);
+	if (router)
+		neigh_node_free_ref(router);
 	if (orig_node)
 		orig_node_free_ref(orig_node);
 	return ret;
@@ -1003,7 +1013,7 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	struct icmp_packet_rr *icmp_packet;
 	struct ethhdr *ethhdr;
 	struct orig_node *orig_node = NULL;
-	struct neigh_node *neigh_node = NULL;
+	struct neigh_node *router = NULL;
 	int hdr_size = sizeof(struct icmp_packet);
 	int ret = NET_RX_DROP;
 
@@ -1050,23 +1060,13 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 		return recv_icmp_ttl_exceeded(bat_priv, skb);
 
 	/* get routing information */
-	rcu_read_lock();
 	orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
-
 	if (!orig_node)
-		goto unlock;
-
-	neigh_node = orig_node->router;
-
-	if (!neigh_node)
-		goto unlock;
-
-	if (!atomic_inc_not_zero(&neigh_node->refcount)) {
-		neigh_node = NULL;
-		goto unlock;
-	}
+		goto out;
 
-	rcu_read_unlock();
+	router = orig_node_get_router(orig_node);
+	if (!router)
+		goto out;
 
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
@@ -1078,20 +1078,117 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 	icmp_packet->ttl--;
 
 	/* route it */
-	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+	send_skb_packet(skb, router->if_incoming, router->addr);
 	ret = NET_RX_SUCCESS;
-	goto out;
 
-unlock:
-	rcu_read_unlock();
 out:
-	if (neigh_node)
-		neigh_node_free_ref(neigh_node);
+	if (router)
+		neigh_node_free_ref(router);
 	if (orig_node)
 		orig_node_free_ref(orig_node);
 	return ret;
 }
 
+/* In the bonding case, send the packets in a round
+ * robin fashion over the remaining interfaces.
+ *
+ * This method rotates the bonding list and increases the
+ * returned router's refcount. */
+static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
+					   struct hard_iface *recv_if)
+{
+	struct neigh_node *tmp_neigh_node;
+	struct neigh_node *router = NULL, *first_candidate = NULL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
+				bonding_list) {
+		if (!first_candidate)
+			first_candidate = tmp_neigh_node;
+
+		/* recv_if == NULL on the first node. */
+		if (tmp_neigh_node->if_incoming == recv_if)
+			continue;
+
+		if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+			continue;
+
+		router = tmp_neigh_node;
+		break;
+	}
+
+	/* use the first candidate if nothing was found. */
+	if (!router && first_candidate &&
+	    atomic_inc_not_zero(&first_candidate->refcount))
+		router = first_candidate;
+
+	if (!router)
+		goto out;
+
+	/* selected should point to the next element
+	 * after the current router */
+	spin_lock_bh(&primary_orig->neigh_list_lock);
+	/* this is a list_move(), which unfortunately
+	 * does not exist as rcu version */
+	list_del_rcu(&primary_orig->bond_list);
+	list_add_rcu(&primary_orig->bond_list,
+		     &router->bonding_list);
+	spin_unlock_bh(&primary_orig->neigh_list_lock);
+
+out:
+	rcu_read_unlock();
+	return router;
+}
+
+/* Interface Alternating: Use the best of the
+ * remaining candidates which are not using
+ * this interface.
+ *
+ * Increases the returned router's refcount */
+static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
+					      struct hard_iface *recv_if)
+{
+	struct neigh_node *tmp_neigh_node;
+	struct neigh_node *router = NULL, *first_candidate = NULL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
+				bonding_list) {
+		if (!first_candidate)
+			first_candidate = tmp_neigh_node;
+
+		/* recv_if == NULL on the first node. */
+		if (tmp_neigh_node->if_incoming == recv_if)
+			continue;
+
+		if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+			continue;
+
+		/* if we don't have a router yet
+		 * or this one is better, choose it. */
+		if ((!router) ||
+		    (tmp_neigh_node->tq_avg > router->tq_avg)) {
+			/* decrement refcount of
+			 * previously selected router */
+			if (router)
+				neigh_node_free_ref(router);
+
+			router = tmp_neigh_node;
+			atomic_inc_not_zero(&router->refcount);
+		}
+
+		neigh_node_free_ref(tmp_neigh_node);
+	}
+
+	/* use the first candidate if nothing was found. */
+	if (!router && first_candidate &&
+	    atomic_inc_not_zero(&first_candidate->refcount))
+		router = first_candidate;
+
+	rcu_read_unlock();
+	return router;
+}
+
 /* find a suitable router for this originator, and use
  * bonding if possible. increases the found neighbors
  * refcount.*/
@@ -1101,14 +1198,15 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
 {
 	struct orig_node *primary_orig_node;
 	struct orig_node *router_orig;
-	struct neigh_node *router, *first_candidate, *tmp_neigh_node;
+	struct neigh_node *router;
 	static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
 	int bonding_enabled;
 
 	if (!orig_node)
 		return NULL;
 
-	if (!orig_node->router)
+	router = orig_node_get_router(orig_node);
+	if (!router)
 		return NULL;
 
 	/* without bonding, the first node should
@@ -1117,9 +1215,8 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
 
 	rcu_read_lock();
 	/* select default router to output */
-	router = orig_node->router;
-	router_orig = orig_node->router->orig_node;
-	if (!router_orig || !atomic_inc_not_zero(&router->refcount)) {
+	router_orig = router->orig_node;
+	if (!router_orig) {
 		rcu_read_unlock();
 		return NULL;
 	}
@@ -1151,88 +1248,17 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
 	if (atomic_read(&primary_orig_node->bond_candidates) < 2)
 		goto return_router;
 
-
 	/* all nodes between should choose a candidate which
 	 * is is not on the interface where the packet came
 	 * in. */
 
 	neigh_node_free_ref(router);
-	first_candidate = NULL;
-	router = NULL;
-
-	if (bonding_enabled) {
-		/* in the bonding case, send the packets in a round
-		 * robin fashion over the remaining interfaces. */
-
-		list_for_each_entry_rcu(tmp_neigh_node,
-				&primary_orig_node->bond_list, bonding_list) {
-			if (!first_candidate)
-				first_candidate = tmp_neigh_node;
-			/* recv_if == NULL on the first node. */
-			if (tmp_neigh_node->if_incoming != recv_if &&
-			    atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
-				router = tmp_neigh_node;
-				break;
-			}
-		}
-
-		/* use the first candidate if nothing was found. */
-		if (!router && first_candidate &&
-		    atomic_inc_not_zero(&first_candidate->refcount))
-			router = first_candidate;
-
-		if (!router) {
-			rcu_read_unlock();
-			return NULL;
-		}
-
-		/* selected should point to the next element
-		 * after the current router */
-		spin_lock_bh(&primary_orig_node->neigh_list_lock);
-		/* this is a list_move(), which unfortunately
-		 * does not exist as rcu version */
-		list_del_rcu(&primary_orig_node->bond_list);
-		list_add_rcu(&primary_orig_node->bond_list,
-				&router->bonding_list);
-		spin_unlock_bh(&primary_orig_node->neigh_list_lock);
-
-	} else {
-		/* if bonding is disabled, use the best of the
-		 * remaining candidates which are not using
-		 * this interface. */
-		list_for_each_entry_rcu(tmp_neigh_node,
-			&primary_orig_node->bond_list, bonding_list) {
-			if (!first_candidate)
-				first_candidate = tmp_neigh_node;
-
-			/* recv_if == NULL on the first node. */
-			if (tmp_neigh_node->if_incoming == recv_if)
-				continue;
 
-			if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
-				continue;
-
-			/* if we don't have a router yet
-			 * or this one is better, choose it. */
-			if ((!router) ||
-			    (tmp_neigh_node->tq_avg > router->tq_avg)) {
-				/* decrement refcount of
-				 * previously selected router */
-				if (router)
-					neigh_node_free_ref(router);
-
-				router = tmp_neigh_node;
-				atomic_inc_not_zero(&router->refcount);
-			}
-
-			neigh_node_free_ref(tmp_neigh_node);
-		}
+	if (bonding_enabled)
+		router = find_bond_router(primary_orig_node, recv_if);
+	else
+		router = find_ifalter_router(primary_orig_node, recv_if);
 
-		/* use the first candidate if nothing was found. */
-		if (!router && first_candidate &&
-		    atomic_inc_not_zero(&first_candidate->refcount))
-			router = first_candidate;
-	}
 return_router:
 	rcu_read_unlock();
 	return router;

net/batman-adv/send.c

@@ -308,6 +308,7 @@ void schedule_forward_packet(struct orig_node *orig_node,
 			     struct hard_iface *if_incoming)
 {
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct neigh_node *router;
 	unsigned char in_tq, in_ttl, tq_avg = 0;
 	unsigned long send_time;
 
@@ -316,6 +317,8 @@ void schedule_forward_packet(struct orig_node *orig_node,
 		return;
 	}
 
+	router = orig_node_get_router(orig_node);
+
 	in_tq = batman_packet->tq;
 	in_ttl = batman_packet->ttl;
 
@@ -324,20 +327,22 @@ void schedule_forward_packet(struct orig_node *orig_node,
 
 	/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
 	 * of our best tq value */
-	if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
+	if (router && router->tq_avg != 0) {
 
 		/* rebroadcast ogm of best ranking neighbor as is */
-		if (!compare_eth(orig_node->router->addr, ethhdr->h_source)) {
-			batman_packet->tq = orig_node->router->tq_avg;
+		if (!compare_eth(router->addr, ethhdr->h_source)) {
+			batman_packet->tq = router->tq_avg;
 
-			if (orig_node->router->last_ttl)
-				batman_packet->ttl = orig_node->router->last_ttl
-							- 1;
+			if (router->last_ttl)
+				batman_packet->ttl = router->last_ttl - 1;
 		}
 
-		tq_avg = orig_node->router->tq_avg;
+		tq_avg = router->tq_avg;
 	}
 
+	if (router)
+		neigh_node_free_ref(router);
+
 	/* apply hop penalty */
 	batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
 

net/batman-adv/soft-interface.c

@@ -90,10 +90,51 @@ static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
 		call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
 }
 
+static struct softif_neigh *softif_neigh_get_selected(struct bat_priv *bat_priv)
+{
+	struct softif_neigh *neigh;
+
+	rcu_read_lock();
+	neigh = rcu_dereference(bat_priv->softif_neigh);
+
+	if (neigh && !atomic_inc_not_zero(&neigh->refcount))
+		neigh = NULL;
+
+	rcu_read_unlock();
+	return neigh;
+}
+
+static void softif_neigh_select(struct bat_priv *bat_priv,
+				struct softif_neigh *new_neigh)
+{
+	struct softif_neigh *curr_neigh;
+
+	spin_lock_bh(&bat_priv->softif_neigh_lock);
+
+	if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
+		new_neigh = NULL;
+
+	curr_neigh = bat_priv->softif_neigh;
+	rcu_assign_pointer(bat_priv->softif_neigh, new_neigh);
+
+	if (curr_neigh)
+		softif_neigh_free_ref(curr_neigh);
+
+	spin_unlock_bh(&bat_priv->softif_neigh_lock);
+}
+
+static void softif_neigh_deselect(struct bat_priv *bat_priv)
+{
+	softif_neigh_select(bat_priv, NULL);
+}
+
 void softif_neigh_purge(struct bat_priv *bat_priv)
 {
-	struct softif_neigh *softif_neigh, *softif_neigh_tmp;
+	struct softif_neigh *softif_neigh, *curr_softif_neigh;
 	struct hlist_node *node, *node_tmp;
+	char do_deselect = 0;
+
+	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
 
 	spin_lock_bh(&bat_priv->softif_neigh_lock);
 
@@ -105,22 +146,26 @@ void softif_neigh_purge(struct bat_priv *bat_priv)
 		    (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
 			continue;
 
-		hlist_del_rcu(&softif_neigh->list);
-
-		if (bat_priv->softif_neigh == softif_neigh) {
+		if (curr_softif_neigh == softif_neigh) {
 			bat_dbg(DBG_ROUTES, bat_priv,
 				 "Current mesh exit point '%pM' vanished "
 				 "(vid: %d).\n",
 				 softif_neigh->addr, softif_neigh->vid);
-			softif_neigh_tmp = bat_priv->softif_neigh;
-			bat_priv->softif_neigh = NULL;
-			softif_neigh_free_ref(softif_neigh_tmp);
+			do_deselect = 1;
 		}
 
+		hlist_del_rcu(&softif_neigh->list);
 		softif_neigh_free_ref(softif_neigh);
 	}
 
 	spin_unlock_bh(&bat_priv->softif_neigh_lock);
+
+	/* soft_neigh_deselect() needs to acquire the softif_neigh_lock */
+	if (do_deselect)
+		softif_neigh_deselect(bat_priv);
+
+	if (curr_softif_neigh)
+		softif_neigh_free_ref(curr_softif_neigh);
 }
 
 static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
@@ -171,6 +216,7 @@ int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 	struct bat_priv *bat_priv = netdev_priv(net_dev);
 	struct softif_neigh *softif_neigh;
 	struct hlist_node *node;
+	struct softif_neigh *curr_softif_neigh;
 
 	if (!bat_priv->primary_if) {
 		return seq_printf(seq, "BATMAN mesh %s disabled - "
@@ -180,14 +226,17 @@ int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 
 	seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
 
+	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(softif_neigh, node,
 				 &bat_priv->softif_neigh_list, list)
 		seq_printf(seq, "%s %pM (vid: %d)\n",
-				bat_priv->softif_neigh == softif_neigh
+				curr_softif_neigh == softif_neigh
 				? "=>" : "  ", softif_neigh->addr,
 				softif_neigh->vid);
 	rcu_read_unlock();
+	if (curr_softif_neigh)
+		softif_neigh_free_ref(curr_softif_neigh);
 
 	return 0;
 }
@@ -198,7 +247,8 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 	struct bat_priv *bat_priv = netdev_priv(dev);
 	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 	struct batman_packet *batman_packet;
-	struct softif_neigh *softif_neigh, *softif_neigh_tmp;
+	struct softif_neigh *softif_neigh;
+	struct softif_neigh *curr_softif_neigh = NULL;
 
 	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
 		batman_packet = (struct batman_packet *)
@@ -223,7 +273,8 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 	if (!softif_neigh)
 		goto err;
 
-	if (bat_priv->softif_neigh == softif_neigh)
+	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
+	if (curr_softif_neigh == softif_neigh)
 		goto out;
 
 	/* we got a neighbor but its mac is 'bigger' than ours  */
@@ -232,38 +283,39 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 		goto out;
 
 	/* switch to new 'smallest neighbor' */
-	if ((bat_priv->softif_neigh) &&
-	    (memcmp(softif_neigh->addr, bat_priv->softif_neigh->addr,
+	if ((curr_softif_neigh) &&
+	    (memcmp(softif_neigh->addr, curr_softif_neigh->addr,
 							ETH_ALEN) < 0)) {
 		bat_dbg(DBG_ROUTES, bat_priv,
 			"Changing mesh exit point from %pM (vid: %d) "
 			"to %pM (vid: %d).\n",
-			 bat_priv->softif_neigh->addr,
-			 bat_priv->softif_neigh->vid,
+			 curr_softif_neigh->addr,
+			 curr_softif_neigh->vid,
 			 softif_neigh->addr, softif_neigh->vid);
-		softif_neigh_tmp = bat_priv->softif_neigh;
-		bat_priv->softif_neigh = softif_neigh;
-		softif_neigh_free_ref(softif_neigh_tmp);
-		/* we need to hold the additional reference */
-		goto err;
+
+		softif_neigh_select(bat_priv, softif_neigh);
+		goto out;
 	}
 
 	/* close own batX device and use softif_neigh as exit node */
-	if ((!bat_priv->softif_neigh) &&
+	if ((!curr_softif_neigh) &&
 	    (memcmp(softif_neigh->addr,
 		    bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) {
 		bat_dbg(DBG_ROUTES, bat_priv,
 			"Setting mesh exit point to %pM (vid: %d).\n",
 			softif_neigh->addr, softif_neigh->vid);
-		bat_priv->softif_neigh = softif_neigh;
-		/* we need to hold the additional reference */
-		goto err;
+
+		softif_neigh_select(bat_priv, softif_neigh);
+		goto out;
 	}
 
 out:
 	softif_neigh_free_ref(softif_neigh);
 err:
 	kfree_skb(skb);
+	if (curr_softif_neigh)
+		softif_neigh_free_ref(curr_softif_neigh);
+
 	return;
 }
 
@@ -321,6 +373,7 @@ int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 	struct bat_priv *bat_priv = netdev_priv(soft_iface);
 	struct bcast_packet *bcast_packet;
 	struct vlan_ethhdr *vhdr;
+	struct softif_neigh *curr_softif_neigh = NULL;
 	int data_len = skb->len, ret;
 	short vid = -1;
 	bool do_bcast = false;
@@ -348,7 +401,8 @@ int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 	 * if we have a another chosen mesh exit node in range
 	 * it will transport the packets to the mesh
 	 */
-	if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid))
+	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
+	if ((curr_softif_neigh) && (curr_softif_neigh->vid == vid))
 		goto dropped;
 
 	/* TODO: check this for locks */
@@ -410,6 +464,8 @@ dropped:
 dropped_freed:
 	bat_priv->stats.tx_dropped++;
 end:
+	if (curr_softif_neigh)
+		softif_neigh_free_ref(curr_softif_neigh);
 	return NETDEV_TX_OK;
 }
 
@@ -421,6 +477,7 @@ void interface_rx(struct net_device *soft_iface,
 	struct unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr;
 	struct vlan_ethhdr *vhdr;
+	struct softif_neigh *curr_softif_neigh = NULL;
 	short vid = -1;
 	int ret;
 
@@ -450,7 +507,8 @@ void interface_rx(struct net_device *soft_iface,
 	 * if we have a another chosen mesh exit node in range
 	 * it will transport the packets to the non-mesh network
 	 */
-	if ((bat_priv->softif_neigh) && (bat_priv->softif_neigh->vid == vid)) {
+	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
+	if (curr_softif_neigh && (curr_softif_neigh->vid == vid)) {
 		skb_push(skb, hdr_size);
 		unicast_packet = (struct unicast_packet *)skb->data;
 
@@ -461,7 +519,7 @@ void interface_rx(struct net_device *soft_iface,
 		skb_reset_mac_header(skb);
 
 		memcpy(unicast_packet->dest,
-		       bat_priv->softif_neigh->addr, ETH_ALEN);
+		       curr_softif_neigh->addr, ETH_ALEN);
 		ret = route_unicast_packet(skb, recv_if);
 		if (ret == NET_RX_DROP)
 			goto dropped;
@@ -486,11 +544,13 @@ void interface_rx(struct net_device *soft_iface,
 	soft_iface->last_rx = jiffies;
 
 	netif_rx(skb);
-	return;
+	goto out;
 
 dropped:
 	kfree_skb(skb);
 out:
+	if (curr_softif_neigh)
+		softif_neigh_free_ref(curr_softif_neigh);
 	return;
 }
 
@@ -524,6 +584,7 @@ static void interface_setup(struct net_device *dev)
 	dev->hard_start_xmit = interface_tx;
 #endif
 	dev->destructor = free_netdev;
+	dev->tx_queue_len = 0;
 
 	/**
 	 * can't call min_mtu, because the needed variables

net/batman-adv/types.h

@@ -67,7 +67,7 @@ struct hard_iface {
 struct orig_node {
 	uint8_t orig[ETH_ALEN];
 	uint8_t primary_addr[ETH_ALEN];
-	struct neigh_node *router;
+	struct neigh_node __rcu *router; /* rcu protected pointer */
 	unsigned long *bcast_own;
 	uint8_t *bcast_own_sum;
 	unsigned long last_valid;
@@ -83,7 +83,7 @@ struct orig_node {
 	uint32_t last_bcast_seqno;
 	struct hlist_head neigh_list;
 	struct list_head frag_list;
-	spinlock_t neigh_list_lock; /* protects neighbor list */
+	spinlock_t neigh_list_lock; /* protects neigh_list and router */
 	atomic_t refcount;
 	struct rcu_head rcu;
 	struct hlist_node hash_entry;
@@ -125,6 +125,7 @@ struct neigh_node {
 	struct rcu_head rcu;
 	struct orig_node *orig_node;
 	struct hard_iface *if_incoming;
+	spinlock_t tq_lock;	/* protects: tq_recv, tq_index */
 };
 
 
@@ -146,7 +147,7 @@ struct bat_priv {
 	atomic_t batman_queue_left;
 	char num_ifaces;
 	struct hlist_head softif_neigh_list;
-	struct softif_neigh *softif_neigh;
+	struct softif_neigh __rcu *softif_neigh;
 	struct debug_log *debug_log;
 	struct hard_iface *primary_if;
 	struct kobject *mesh_obj;

net/batman-adv/unicast.c

@@ -289,7 +289,7 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 
 	/* get routing information */
 	if (is_multicast_ether_addr(ethhdr->h_dest)) {
-		orig_node = (struct orig_node *)gw_get_selected(bat_priv);
+		orig_node = (struct orig_node *)gw_get_selected_orig(bat_priv);
 		if (orig_node)
 			goto find_router;
 	}

net/batman-adv/vis.c

@@ -558,6 +558,7 @@ static int find_best_vis_server(struct bat_priv *bat_priv,
 				struct vis_info *info)
 {
 	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct neigh_node *router;
 	struct hlist_node *node;
 	struct hlist_head *head;
 	struct orig_node *orig_node;
@@ -571,13 +572,17 @@ static int find_best_vis_server(struct bat_priv *bat_priv,
 
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
-			if ((orig_node) && (orig_node->router) &&
-			    (orig_node->flags & VIS_SERVER) &&
-			    (orig_node->router->tq_avg > best_tq)) {
-				best_tq = orig_node->router->tq_avg;
+			router = orig_node_get_router(orig_node);
+			if (!router)
+				continue;
+
+			if ((orig_node->flags & VIS_SERVER) &&
+			    (router->tq_avg > best_tq)) {
+				best_tq = router->tq_avg;
 				memcpy(packet->target_orig, orig_node->orig,
 				       ETH_ALEN);
 			}
+			neigh_node_free_ref(router);
 		}
 		rcu_read_unlock();
 	}
@@ -605,7 +610,7 @@ static int generate_vis_packet(struct bat_priv *bat_priv)
 	struct hlist_node *node;
 	struct hlist_head *head;
 	struct orig_node *orig_node;
-	struct neigh_node *neigh_node;
+	struct neigh_node *router;
 	struct vis_info *info = (struct vis_info *)bat_priv->my_vis_info;
 	struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data;
 	struct vis_info_entry *entry;
@@ -633,30 +638,32 @@ static int generate_vis_packet(struct bat_priv *bat_priv)
 
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
-			neigh_node = orig_node->router;
-
-			if (!neigh_node)
+			router = orig_node_get_router(orig_node);
+			if (!router)
 				continue;
 
-			if (!compare_eth(neigh_node->addr, orig_node->orig))
-				continue;
+			if (!compare_eth(router->addr, orig_node->orig))
+				goto next;
 
-			if (neigh_node->if_incoming->if_status != IF_ACTIVE)
-				continue;
+			if (router->if_incoming->if_status != IF_ACTIVE)
+				goto next;
 
-			if (neigh_node->tq_avg < 1)
-				continue;
+			if (router->tq_avg < 1)
+				goto next;
 
 			/* fill one entry into buffer. */
 			entry = (struct vis_info_entry *)
 				      skb_put(info->skb_packet, sizeof(*entry));
 			memcpy(entry->src,
-			       neigh_node->if_incoming->net_dev->dev_addr,
+			       router->if_incoming->net_dev->dev_addr,
 			       ETH_ALEN);
 			memcpy(entry->dest, orig_node->orig, ETH_ALEN);
-			entry->quality = neigh_node->tq_avg;
+			entry->quality = router->tq_avg;
 			packet->entries++;
 
+next:
+			neigh_node_free_ref(router);
+
 			if (vis_packet_full(info))
 				goto unlock;
 		}
@@ -725,6 +732,7 @@ static void purge_vis_packets(struct bat_priv *bat_priv)
 static void broadcast_vis_packet(struct bat_priv *bat_priv,
 				 struct vis_info *info)
 {
+	struct neigh_node *router;
 	struct hashtable_t *hash = bat_priv->orig_hash;
 	struct hlist_node *node;
 	struct hlist_head *head;
@@ -745,19 +753,26 @@ static void broadcast_vis_packet(struct bat_priv *bat_priv,
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
 			/* if it's a vis server and reachable, send it. */
-			if ((!orig_node) || (!orig_node->router))
-				continue;
 			if (!(orig_node->flags & VIS_SERVER))
 				continue;
+
+			router = orig_node_get_router(orig_node);
+			if (!router)
+				continue;
+
 			/* don't send it if we already received the packet from
-			* this node. */
+			 * this node. */
 			if (recv_list_is_in(bat_priv, &info->recv_list,
-					    orig_node->orig))
+					    orig_node->orig)) {
+				neigh_node_free_ref(router);
 				continue;
+			}
 
 			memcpy(packet->target_orig, orig_node->orig, ETH_ALEN);
-			hard_iface = orig_node->router->if_incoming;
-			memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+			hard_iface = router->if_incoming;
+			memcpy(dstaddr, router->addr, ETH_ALEN);
+
+			neigh_node_free_ref(router);
 
 			skb = skb_clone(info->skb_packet, GFP_ATOMIC);
 			if (skb)
@@ -772,45 +787,29 @@ static void unicast_vis_packet(struct bat_priv *bat_priv,
 			       struct vis_info *info)
 {
 	struct orig_node *orig_node;
-	struct neigh_node *neigh_node = NULL;
+	struct neigh_node *router = NULL;
 	struct sk_buff *skb;
 	struct vis_packet *packet;
 
 	packet = (struct vis_packet *)info->skb_packet->data;
 
-	rcu_read_lock();
 	orig_node = orig_hash_find(bat_priv, packet->target_orig);
-
 	if (!orig_node)
-		goto unlock;
+		goto out;
 
-	neigh_node = orig_node->router;
-
-	if (!neigh_node)
-		goto unlock;
-
-	if (!atomic_inc_not_zero(&neigh_node->refcount)) {
-		neigh_node = NULL;
-		goto unlock;
-	}
-
-	rcu_read_unlock();
+	router = orig_node_get_router(orig_node);
+	if (!router)
+		goto out;
 
 	skb = skb_clone(info->skb_packet, GFP_ATOMIC);
 	if (skb)
-		send_skb_packet(skb, neigh_node->if_incoming,
-				neigh_node->addr);
-
-	goto out;
+		send_skb_packet(skb, router->if_incoming, router->addr);
 
-unlock:
-	rcu_read_unlock();
 out:
-	if (neigh_node)
-		neigh_node_free_ref(neigh_node);
+	if (router)
+		neigh_node_free_ref(router);
 	if (orig_node)
 		orig_node_free_ref(orig_node);
-	return;
 }
 
 /* only send one vis packet. called from send_vis_packets() */