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

net/batman-adv/aggregation.c

@@ -35,7 +35,7 @@ static bool can_aggregate_with(struct batman_packet *new_batman_packet,
 			       int packet_len,
 			       unsigned long send_time,
 			       bool directlink,
-			       struct batman_if *if_incoming,
+			       struct hard_iface *if_incoming,
 			       struct forw_packet *forw_packet)
 {
 	struct batman_packet *batman_packet =
@@ -99,7 +99,7 @@ static bool can_aggregate_with(struct batman_packet *new_batman_packet,
 /* create a new aggregated packet and add this packet to it */
 static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
 				  unsigned long send_time, bool direct_link,
-				  struct batman_if *if_incoming,
+				  struct hard_iface *if_incoming,
 				  int own_packet)
 {
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
@@ -188,7 +188,7 @@ static void aggregate(struct forw_packet *forw_packet_aggr,
 
 void add_bat_packet_to_list(struct bat_priv *bat_priv,
 			    unsigned char *packet_buff, int packet_len,
-			    struct batman_if *if_incoming, char own_packet,
+			    struct hard_iface *if_incoming, char own_packet,
 			    unsigned long send_time)
 {
 	/**
@@ -247,7 +247,7 @@ void add_bat_packet_to_list(struct bat_priv *bat_priv,
 
 /* unpack the aggregated packets and process them one by one */
 void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
-			     int packet_len, struct batman_if *if_incoming)
+			     int packet_len, struct hard_iface *if_incoming)
 {
 	struct batman_packet *batman_packet;
 	int buff_pos = 0;

net/batman-adv/aggregation.h

@@ -35,9 +35,9 @@ static inline int aggregated_packet(int buff_pos, int packet_len, int num_hna)
 
 void add_bat_packet_to_list(struct bat_priv *bat_priv,
 			    unsigned char *packet_buff, int packet_len,
-			    struct batman_if *if_incoming, char own_packet,
+			    struct hard_iface *if_incoming, char own_packet,
 			    unsigned long send_time);
 void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
-			     int packet_len, struct batman_if *if_incoming);
+			     int packet_len, struct hard_iface *if_incoming);
 
 #endif /* _NET_BATMAN_ADV_AGGREGATION_H_ */

net/batman-adv/bat_sysfs.c

@@ -441,16 +441,16 @@ static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr,
 			       char *buff)
 {
 	struct net_device *net_dev = kobj_to_netdev(kobj);
-	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 	ssize_t length;
 
-	if (!batman_if)
+	if (!hard_iface)
 		return 0;
 
-	length = sprintf(buff, "%s\n", batman_if->if_status == IF_NOT_IN_USE ?
-			 "none" : batman_if->soft_iface->name);
+	length = sprintf(buff, "%s\n", hard_iface->if_status == IF_NOT_IN_USE ?
+			 "none" : hard_iface->soft_iface->name);
 
-	kref_put(&batman_if->refcount, hardif_free_ref);
+	hardif_free_ref(hard_iface);
 
 	return length;
 }
@@ -459,11 +459,11 @@ static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
 				char *buff, size_t count)
 {
 	struct net_device *net_dev = kobj_to_netdev(kobj);
-	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 	int status_tmp = -1;
-	int ret;
+	int ret = count;
 
-	if (!batman_if)
+	if (!hard_iface)
 		return count;
 
 	if (buff[count - 1] == '\n')
@@ -472,7 +472,7 @@ static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
 	if (strlen(buff) >= IFNAMSIZ) {
 		pr_err("Invalid parameter for 'mesh_iface' setting received: "
 		       "interface name too long '%s'\n", buff);
-		kref_put(&batman_if->refcount, hardif_free_ref);
+		hardif_free_ref(hard_iface);
 		return -EINVAL;
 	}
 
@@ -481,30 +481,31 @@ static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
 	else
 		status_tmp = IF_I_WANT_YOU;
 
-	if ((batman_if->if_status == status_tmp) || ((batman_if->soft_iface) &&
-	    (strncmp(batman_if->soft_iface->name, buff, IFNAMSIZ) == 0))) {
-		kref_put(&batman_if->refcount, hardif_free_ref);
-		return count;
-	}
+	if (hard_iface->if_status == status_tmp)
+		goto out;
+
+	if ((hard_iface->soft_iface) &&
+	    (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
+		goto out;
 
 	if (status_tmp == IF_NOT_IN_USE) {
 		rtnl_lock();
-		hardif_disable_interface(batman_if);
+		hardif_disable_interface(hard_iface);
 		rtnl_unlock();
-		kref_put(&batman_if->refcount, hardif_free_ref);
-		return count;
+		goto out;
 	}
 
 	/* if the interface already is in use */
-	if (batman_if->if_status != IF_NOT_IN_USE) {
+	if (hard_iface->if_status != IF_NOT_IN_USE) {
 		rtnl_lock();
-		hardif_disable_interface(batman_if);
+		hardif_disable_interface(hard_iface);
 		rtnl_unlock();
 	}
 
-	ret = hardif_enable_interface(batman_if, buff);
-	kref_put(&batman_if->refcount, hardif_free_ref);
+	ret = hardif_enable_interface(hard_iface, buff);
 
+out:
+	hardif_free_ref(hard_iface);
 	return ret;
 }
 
@@ -512,13 +513,13 @@ static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
 				 char *buff)
 {
 	struct net_device *net_dev = kobj_to_netdev(kobj);
-	struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+	struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 	ssize_t length;
 
-	if (!batman_if)
+	if (!hard_iface)
 		return 0;
 
-	switch (batman_if->if_status) {
+	switch (hard_iface->if_status) {
 	case IF_TO_BE_REMOVED:
 		length = sprintf(buff, "disabling\n");
 		break;
@@ -537,7 +538,7 @@ static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
 		break;
 	}
 
-	kref_put(&batman_if->refcount, hardif_free_ref);
+	hardif_free_ref(hard_iface);
 
 	return length;
 }

net/batman-adv/gateway_client.c

@@ -28,58 +28,75 @@
 #include <linux/udp.h>
 #include <linux/if_vlan.h>
 
-static void gw_node_free_ref(struct kref *refcount)
+static void gw_node_free_rcu(struct rcu_head *rcu)
 {
 	struct gw_node *gw_node;
 
-	gw_node = container_of(refcount, struct gw_node, refcount);
+	gw_node = container_of(rcu, struct gw_node, rcu);
 	kfree(gw_node);
 }
 
-static void gw_node_free_rcu(struct rcu_head *rcu)
+static void gw_node_free_ref(struct gw_node *gw_node)
 {
-	struct gw_node *gw_node;
-
-	gw_node = container_of(rcu, struct gw_node, rcu);
-	kref_put(&gw_node->refcount, gw_node_free_ref);
+	if (atomic_dec_and_test(&gw_node->refcount))
+		call_rcu(&gw_node->rcu, gw_node_free_rcu);
 }
 
 void *gw_get_selected(struct bat_priv *bat_priv)
 {
-	struct gw_node *curr_gateway_tmp = bat_priv->curr_gw;
+	struct gw_node *curr_gateway_tmp;
+	struct orig_node *orig_node = NULL;
 
+	rcu_read_lock();
+	curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
 	if (!curr_gateway_tmp)
-		return NULL;
+		goto out;
+
+	orig_node = curr_gateway_tmp->orig_node;
+	if (!orig_node)
+		goto out;
 
-	return curr_gateway_tmp->orig_node;
+	if (!atomic_inc_not_zero(&orig_node->refcount))
+		orig_node = NULL;
+
+out:
+	rcu_read_unlock();
+	return orig_node;
 }
 
 void gw_deselect(struct bat_priv *bat_priv)
 {
-	struct gw_node *gw_node = bat_priv->curr_gw;
+	struct gw_node *gw_node;
 
-	bat_priv->curr_gw = 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);
 
 	if (gw_node)
-		kref_put(&gw_node->refcount, gw_node_free_ref);
+		gw_node_free_ref(gw_node);
 }
 
-static struct gw_node *gw_select(struct bat_priv *bat_priv,
-			  struct gw_node *new_gw_node)
+static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
 {
-	struct gw_node *curr_gw_node = bat_priv->curr_gw;
+	struct gw_node *curr_gw_node;
 
-	if (new_gw_node)
-		kref_get(&new_gw_node->refcount);
+	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);
+	rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
+	spin_unlock_bh(&bat_priv->gw_list_lock);
 
-	bat_priv->curr_gw = new_gw_node;
-	return curr_gw_node;
+	if (curr_gw_node)
+		gw_node_free_ref(curr_gw_node);
 }
 
 void gw_election(struct bat_priv *bat_priv)
 {
 	struct hlist_node *node;
-	struct gw_node *gw_node, *curr_gw_tmp = NULL, *old_gw_node = NULL;
+	struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL;
 	uint8_t max_tq = 0;
 	uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
 	int down, up;
@@ -93,19 +110,23 @@ void gw_election(struct bat_priv *bat_priv)
 	if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
 		return;
 
-	if (bat_priv->curr_gw)
+	rcu_read_lock();
+	curr_gw = rcu_dereference(bat_priv->curr_gw);
+	if (curr_gw) {
+		rcu_read_unlock();
 		return;
+	}
 
-	rcu_read_lock();
 	if (hlist_empty(&bat_priv->gw_list)) {
-		rcu_read_unlock();
 
-		if (bat_priv->curr_gw) {
+		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;
 	}
@@ -154,12 +175,12 @@ void gw_election(struct bat_priv *bat_priv)
 			max_gw_factor = tmp_gw_factor;
 	}
 
-	if (bat_priv->curr_gw != curr_gw_tmp) {
-		if ((bat_priv->curr_gw) && (!curr_gw_tmp))
+	if (curr_gw != curr_gw_tmp) {
+		if ((curr_gw) && (!curr_gw_tmp))
 			bat_dbg(DBG_BATMAN, bat_priv,
 				"Removing selected gateway - "
 				"no gateway in range\n");
-		else if ((!bat_priv->curr_gw) && (curr_gw_tmp))
+		else if ((!curr_gw) && (curr_gw_tmp))
 			bat_dbg(DBG_BATMAN, bat_priv,
 				"Adding route to gateway %pM "
 				"(gw_flags: %i, tq: %i)\n",
@@ -174,43 +195,43 @@ void gw_election(struct bat_priv *bat_priv)
 				curr_gw_tmp->orig_node->gw_flags,
 				curr_gw_tmp->orig_node->router->tq_avg);
 
-		old_gw_node = gw_select(bat_priv, curr_gw_tmp);
+		gw_select(bat_priv, curr_gw_tmp);
 	}
 
 	rcu_read_unlock();
-
-	/* the kfree() has to be outside of the rcu lock */
-	if (old_gw_node)
-		kref_put(&old_gw_node->refcount, gw_node_free_ref);
 }
 
 void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
 {
-	struct gw_node *curr_gateway_tmp = bat_priv->curr_gw;
+	struct gw_node *curr_gateway_tmp;
 	uint8_t gw_tq_avg, orig_tq_avg;
 
+	rcu_read_lock();
+	curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
 	if (!curr_gateway_tmp)
-		return;
+		goto out_rcu;
 
 	if (!curr_gateway_tmp->orig_node)
-		goto deselect;
+		goto deselect_rcu;
 
 	if (!curr_gateway_tmp->orig_node->router)
-		goto deselect;
+		goto deselect_rcu;
 
 	/* this node already is the gateway */
 	if (curr_gateway_tmp->orig_node == orig_node)
-		return;
+		goto out_rcu;
 
 	if (!orig_node->router)
-		return;
+		goto out_rcu;
 
 	gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg;
+	rcu_read_unlock();
+
 	orig_tq_avg = orig_node->router->tq_avg;
 
 	/* the TQ value has to be better */
 	if (orig_tq_avg < gw_tq_avg)
-		return;
+		goto out;
 
 	/**
 	 * if the routing class is greater than 3 the value tells us how much
@@ -218,15 +239,23 @@ void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
 	 **/
 	if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
 	    (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
-		return;
+		goto out;
 
 	bat_dbg(DBG_BATMAN, bat_priv,
 		"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:
+	return;
 }
 
 static void gw_node_add(struct bat_priv *bat_priv,
@@ -242,7 +271,7 @@ static void gw_node_add(struct bat_priv *bat_priv,
 	memset(gw_node, 0, sizeof(struct gw_node));
 	INIT_HLIST_NODE(&gw_node->list);
 	gw_node->orig_node = orig_node;
-	kref_init(&gw_node->refcount);
+	atomic_set(&gw_node->refcount, 1);
 
 	spin_lock_bh(&bat_priv->gw_list_lock);
 	hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
@@ -283,7 +312,7 @@ void gw_node_update(struct bat_priv *bat_priv,
 				"Gateway %pM removed from gateway list\n",
 				orig_node->orig);
 
-			if (gw_node == bat_priv->curr_gw) {
+			if (gw_node == rcu_dereference(bat_priv->curr_gw)) {
 				rcu_read_unlock();
 				gw_deselect(bat_priv);
 				return;
@@ -321,11 +350,11 @@ void gw_node_purge(struct bat_priv *bat_priv)
 		    atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
 			continue;
 
-		if (bat_priv->curr_gw == gw_node)
+		if (rcu_dereference(bat_priv->curr_gw) == gw_node)
 			gw_deselect(bat_priv);
 
 		hlist_del_rcu(&gw_node->list);
-		call_rcu(&gw_node->rcu, gw_node_free_rcu);
+		gw_node_free_ref(gw_node);
 	}
 
 
@@ -335,12 +364,16 @@ void gw_node_purge(struct bat_priv *bat_priv)
 static int _write_buffer_text(struct bat_priv *bat_priv,
 			      struct seq_file *seq, struct gw_node *gw_node)
 {
-	int down, up;
+	struct gw_node *curr_gw;
+	int down, up, ret;
 
 	gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
 
-	return seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
-		       (bat_priv->curr_gw == gw_node ? "=>" : "  "),
+	rcu_read_lock();
+	curr_gw = rcu_dereference(bat_priv->curr_gw);
+
+	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,
@@ -350,6 +383,9 @@ static int _write_buffer_text(struct bat_priv *bat_priv,
 		       (down > 2048 ? "MBit" : "KBit"),
 		       (up > 2048 ? up / 1024 : up),
 		       (up > 2048 ? "MBit" : "KBit"));
+
+	rcu_read_unlock();
+	return ret;
 }
 
 int gw_client_seq_print_text(struct seq_file *seq, void *offset)
@@ -470,8 +506,12 @@ 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;
 
-	if (!bat_priv->curr_gw)
+	rcu_read_lock();
+	if (!rcu_dereference(bat_priv->curr_gw)) {
+		rcu_read_unlock();
 		return 0;
+	}
+	rcu_read_unlock();
 
 	return 1;
 }

net/batman-adv/hard-interface.h

@@ -31,19 +31,18 @@
 
 extern struct notifier_block hard_if_notifier;
 
-struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev);
-int hardif_enable_interface(struct batman_if *batman_if, char *iface_name);
-void hardif_disable_interface(struct batman_if *batman_if);
+struct hard_iface *hardif_get_by_netdev(struct net_device *net_dev);
+int hardif_enable_interface(struct hard_iface *hard_iface, char *iface_name);
+void hardif_disable_interface(struct hard_iface *hard_iface);
 void hardif_remove_interfaces(void);
 int hardif_min_mtu(struct net_device *soft_iface);
 void update_min_mtu(struct net_device *soft_iface);
+void hardif_free_rcu(struct rcu_head *rcu);
 
-static inline void hardif_free_ref(struct kref *refcount)
+static inline void hardif_free_ref(struct hard_iface *hard_iface)
 {
-	struct batman_if *batman_if;
-
-	batman_if = container_of(refcount, struct batman_if, refcount);
-	kfree(batman_if);
+	if (atomic_dec_and_test(&hard_iface->refcount))
+		call_rcu(&hard_iface->rcu, hardif_free_rcu);
 }
 
 #endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */

net/batman-adv/hash.c

@@ -27,13 +27,16 @@ static void hash_init(struct hashtable_t *hash)
 {
 	int i;
 
-	for (i = 0 ; i < hash->size; i++)
+	for (i = 0 ; i < hash->size; i++) {
 		INIT_HLIST_HEAD(&hash->table[i]);
+		spin_lock_init(&hash->list_locks[i]);
+	}
 }
 
 /* free only the hashtable and the hash itself. */
 void hash_destroy(struct hashtable_t *hash)
 {
+	kfree(hash->list_locks);
 	kfree(hash->table);
 	kfree(hash);
 }
@@ -43,20 +46,25 @@ struct hashtable_t *hash_new(int size)
 {
 	struct hashtable_t *hash;
 
-	hash = kmalloc(sizeof(struct hashtable_t) , GFP_ATOMIC);
-
+	hash = kmalloc(sizeof(struct hashtable_t), GFP_ATOMIC);
 	if (!hash)
 		return NULL;
 
-	hash->size = size;
 	hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC);
+	if (!hash->table)
+		goto free_hash;
 
-	if (!hash->table) {
-		kfree(hash);
-		return NULL;
-	}
+	hash->list_locks = kmalloc(sizeof(spinlock_t) * size, GFP_ATOMIC);
+	if (!hash->list_locks)
+		goto free_table;
 
+	hash->size = size;
 	hash_init(hash);
-
 	return hash;
+
+free_table:
+	kfree(hash->table);
+free_hash:
+	kfree(hash);
+	return NULL;
 }

net/batman-adv/hash.h

@@ -28,21 +28,17 @@
  * compare 2 element datas for their keys,
  * return 0 if same and not 0 if not
  * same */
-typedef int (*hashdata_compare_cb)(void *, void *);
+typedef int (*hashdata_compare_cb)(struct hlist_node *, void *);
 
 /* the hashfunction, should return an index
  * based on the key in the data of the first
  * argument and the size the second */
 typedef int (*hashdata_choose_cb)(void *, int);
-typedef void (*hashdata_free_cb)(void *, void *);
-
-struct element_t {
-	void *data;		/* pointer to the data */
-	struct hlist_node hlist;	/* bucket list pointer */
-};
+typedef void (*hashdata_free_cb)(struct hlist_node *, void *);
 
 struct hashtable_t {
-	struct hlist_head *table;   /* the hashtable itself, with the buckets */
+	struct hlist_head *table;   /* the hashtable itself with the buckets */
+	spinlock_t *list_locks;     /* spinlock for each hash list entry */
 	int size;		    /* size of hashtable */
 };
 
@@ -59,21 +55,22 @@ static inline void hash_delete(struct hashtable_t *hash,
 			       hashdata_free_cb free_cb, void *arg)
 {
 	struct hlist_head *head;
-	struct hlist_node *walk, *safe;
-	struct element_t *bucket;
+	struct hlist_node *node, *node_tmp;
+	spinlock_t *list_lock; /* spinlock to protect write access */
 	int i;
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
+		list_lock = &hash->list_locks[i];
 
-		hlist_for_each_safe(walk, safe, head) {
-			bucket = hlist_entry(walk, struct element_t, hlist);
-			if (free_cb)
-				free_cb(bucket->data, arg);
+		spin_lock_bh(list_lock);
+		hlist_for_each_safe(node, node_tmp, head) {
+			hlist_del_rcu(node);
 
-			hlist_del(walk);
-			kfree(bucket);
+			if (free_cb)
+				free_cb(node, arg);
 		}
+		spin_unlock_bh(list_lock);
 	}
 
 	hash_destroy(hash);
@@ -82,35 +79,41 @@ static inline void hash_delete(struct hashtable_t *hash,
 /* adds data to the hashtable. returns 0 on success, -1 on error */
 static inline int hash_add(struct hashtable_t *hash,
 			   hashdata_compare_cb compare,
-			   hashdata_choose_cb choose, void *data)
+			   hashdata_choose_cb choose,
+			   void *data, struct hlist_node *data_node)
 {
 	int index;
 	struct hlist_head *head;
-	struct hlist_node *walk, *safe;
-	struct element_t *bucket;
+	struct hlist_node *node;
+	spinlock_t *list_lock; /* spinlock to protect write access */
 
 	if (!hash)
-		return -1;
+		goto err;
 
 	index = choose(data, hash->size);
 	head = &hash->table[index];
+	list_lock = &hash->list_locks[index];
+
+	rcu_read_lock();
+	__hlist_for_each_rcu(node, head) {
+		if (!compare(node, data))
+			continue;
 
-	hlist_for_each_safe(walk, safe, head) {
-		bucket = hlist_entry(walk, struct element_t, hlist);
-		if (compare(bucket->data, data))
-			return -1;
+		goto err_unlock;
 	}
+	rcu_read_unlock();
 
 	/* no duplicate found in list, add new element */
-	bucket = kmalloc(sizeof(struct element_t), GFP_ATOMIC);
-
-	if (!bucket)
-		return -1;
-
-	bucket->data = data;
-	hlist_add_head(&bucket->hlist, head);
+	spin_lock_bh(list_lock);
+	hlist_add_head_rcu(data_node, head);
+	spin_unlock_bh(list_lock);
 
 	return 0;
+
+err_unlock:
+	rcu_read_unlock();
+err:
+	return -1;
 }
 
 /* removes data from hash, if found. returns pointer do data on success, so you
@@ -122,50 +125,25 @@ static inline void *hash_remove(struct hashtable_t *hash,
 				hashdata_choose_cb choose, void *data)
 {
 	size_t index;
-	struct hlist_node *walk;
-	struct element_t *bucket;
+	struct hlist_node *node;
 	struct hlist_head *head;
-	void *data_save;
+	void *data_save = NULL;
 
 	index = choose(data, hash->size);
 	head = &hash->table[index];
 
-	hlist_for_each_entry(bucket, walk, head, hlist) {
-		if (compare(bucket->data, data)) {
-			data_save = bucket->data;
-			hlist_del(walk);
-			kfree(bucket);
-			return data_save;
-		}
-	}
-
-	return NULL;
-}
-
-/* finds data, based on the key in keydata. returns the found data on success,
- * or NULL on error */
-static inline void *hash_find(struct hashtable_t *hash,
-			      hashdata_compare_cb compare,
-			      hashdata_choose_cb choose, void *keydata)
-{
-	int index;
-	struct hlist_head *head;
-	struct hlist_node *walk;
-	struct element_t *bucket;
-
-	if (!hash)
-		return NULL;
-
-	index = choose(keydata , hash->size);
-	head = &hash->table[index];
+	spin_lock_bh(&hash->list_locks[index]);
+	hlist_for_each(node, head) {
+		if (!compare(node, data))
+			continue;
 
-	hlist_for_each(walk, head) {
-		bucket = hlist_entry(walk, struct element_t, hlist);
-		if (compare(bucket->data, keydata))
-			return bucket->data;
+		data_save = node;
+		hlist_del_rcu(node);
+		break;
 	}
+	spin_unlock_bh(&hash->list_locks[index]);
 
-	return NULL;
+	return data_save;
 }
 
 #endif /* _NET_BATMAN_ADV_HASH_H_ */

net/batman-adv/icmp_socket.c

@@ -156,10 +156,9 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
 	struct sk_buff *skb;
 	struct icmp_packet_rr *icmp_packet;
 
-	struct orig_node *orig_node;
-	struct batman_if *batman_if;
+	struct orig_node *orig_node = NULL;
+	struct neigh_node *neigh_node = NULL;
 	size_t packet_len = sizeof(struct icmp_packet);
-	uint8_t dstaddr[ETH_ALEN];
 
 	if (len < sizeof(struct icmp_packet)) {
 		bat_dbg(DBG_BATMAN, bat_priv,
@@ -219,47 +218,52 @@ 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;
 
-	spin_lock_bh(&bat_priv->orig_hash_lock);
-	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
-						   compare_orig, choose_orig,
-						   icmp_packet->dst));
+	rcu_read_lock();
+	orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
 
 	if (!orig_node)
 		goto unlock;
 
-	if (!orig_node->router)
+	neigh_node = orig_node->router;
+
+	if (!neigh_node)
 		goto unlock;
 
-	batman_if = orig_node->router->if_incoming;
-	memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+	if (!atomic_inc_not_zero(&neigh_node->refcount)) {
+		neigh_node = NULL;
+		goto unlock;
+	}
 
-	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	rcu_read_unlock();
 
-	if (!batman_if)
+	if (!neigh_node->if_incoming)
 		goto dst_unreach;
 
-	if (batman_if->if_status != IF_ACTIVE)
+	if (neigh_node->if_incoming->if_status != IF_ACTIVE)
 		goto dst_unreach;
 
 	memcpy(icmp_packet->orig,
 	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
 
 	if (packet_len == sizeof(struct icmp_packet_rr))
-		memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
-
-
-	send_skb_packet(skb, batman_if, dstaddr);
+		memcpy(icmp_packet->rr,
+		       neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN);
 
+	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
 	goto out;
 
 unlock:
-	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	rcu_read_unlock();
 dst_unreach:
 	icmp_packet->msg_type = DESTINATION_UNREACHABLE;
 	bat_socket_add_packet(socket_client, icmp_packet, packet_len);
 free_skb:
 	kfree_skb(skb);
 out:
+	if (neigh_node)
+		neigh_node_free_ref(neigh_node);
+	if (orig_node)
+		orig_node_free_ref(orig_node);
 	return len;
 }
 

net/batman-adv/main.c

@@ -33,7 +33,7 @@
 #include "vis.h"
 #include "hash.h"
 
-struct list_head if_list;
+struct list_head hardif_list;
 
 unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 
@@ -41,7 +41,7 @@ struct workqueue_struct *bat_event_workqueue;
 
 static int __init batman_init(void)
 {
-	INIT_LIST_HEAD(&if_list);
+	INIT_LIST_HEAD(&hardif_list);
 
 	/* the name should not be longer than 10 chars - see
 	 * http://lwn.net/Articles/23634/ */
@@ -79,7 +79,6 @@ int mesh_init(struct net_device *soft_iface)
 {
 	struct bat_priv *bat_priv = netdev_priv(soft_iface);
 
-	spin_lock_init(&bat_priv->orig_hash_lock);
 	spin_lock_init(&bat_priv->forw_bat_list_lock);
 	spin_lock_init(&bat_priv->forw_bcast_list_lock);
 	spin_lock_init(&bat_priv->hna_lhash_lock);
@@ -154,14 +153,14 @@ void dec_module_count(void)
 
 int is_my_mac(uint8_t *addr)
 {
-	struct batman_if *batman_if;
+	struct hard_iface *hard_iface;
 
 	rcu_read_lock();
-	list_for_each_entry_rcu(batman_if, &if_list, list) {
-		if (batman_if->if_status != IF_ACTIVE)
+	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
+		if (hard_iface->if_status != IF_ACTIVE)
 			continue;
 
-		if (compare_orig(batman_if->net_dev->dev_addr, addr)) {
+		if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
 			rcu_read_unlock();
 			return 1;
 		}

net/batman-adv/main.h

@@ -122,7 +122,7 @@
 #define REVISION_VERSION_STR " "REVISION_VERSION
 #endif
 
-extern struct list_head if_list;
+extern struct list_head hardif_list;
 
 extern unsigned char broadcast_addr[];
 extern struct workqueue_struct *bat_event_workqueue;
@@ -165,4 +165,14 @@ static inline void bat_dbg(char type __always_unused,
 		pr_err("%s: " fmt, _netdev->name, ## arg);		\
 	} while (0)
 
+/**
+ * returns 1 if they are the same ethernet addr
+ *
+ * note: can't use compare_ether_addr() as it requires aligned memory
+ */
+static inline int compare_eth(void *data1, void *data2)
+{
+	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
+}
+
 #endif /* _NET_BATMAN_ADV_MAIN_H_ */

net/batman-adv/originator.h

@@ -22,21 +22,28 @@
 #ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
 #define _NET_BATMAN_ADV_ORIGINATOR_H_
 
+#include "hash.h"
+
 int originator_init(struct bat_priv *bat_priv);
 void originator_free(struct bat_priv *bat_priv);
 void purge_orig_ref(struct bat_priv *bat_priv);
+void orig_node_free_ref(struct orig_node *orig_node);
 struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr);
-struct neigh_node *
-create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
-		uint8_t *neigh, struct batman_if *if_incoming);
+struct neigh_node *create_neighbor(struct orig_node *orig_node,
+				   struct orig_node *orig_neigh_node,
+				   uint8_t *neigh,
+				   struct hard_iface *if_incoming);
+void neigh_node_free_ref(struct neigh_node *neigh_node);
 int orig_seq_print_text(struct seq_file *seq, void *offset);
-int orig_hash_add_if(struct batman_if *batman_if, int max_if_num);
-int orig_hash_del_if(struct batman_if *batman_if, int max_if_num);
+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);
 
 
 /* returns 1 if they are the same originator */
-static inline int compare_orig(void *data1, void *data2)
+static inline int compare_orig(struct hlist_node *node, void *data2)
 {
+	void *data1 = container_of(node, struct orig_node, hash_entry);
+
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
@@ -61,4 +68,35 @@ static inline int choose_orig(void *data, int32_t size)
 	return hash % size;
 }
 
+static inline struct orig_node *orig_hash_find(struct bat_priv *bat_priv,
+					       void *data)
+{
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_head *head;
+	struct hlist_node *node;
+	struct orig_node *orig_node, *orig_node_tmp = NULL;
+	int index;
+
+	if (!hash)
+		return NULL;
+
+	index = choose_orig(data, hash->size);
+	head = &hash->table[index];
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
+		if (!compare_eth(orig_node, data))
+			continue;
+
+		if (!atomic_inc_not_zero(&orig_node->refcount))
+			continue;
+
+		orig_node_tmp = orig_node;
+		break;
+	}
+	rcu_read_unlock();
+
+	return orig_node_tmp;
+}
+
 #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */

net/batman-adv/routing.h

@@ -22,24 +22,25 @@
 #ifndef _NET_BATMAN_ADV_ROUTING_H_
 #define _NET_BATMAN_ADV_ROUTING_H_
 
-void slide_own_bcast_window(struct batman_if *batman_if);
+void slide_own_bcast_window(struct hard_iface *hard_iface);
 void receive_bat_packet(struct ethhdr *ethhdr,
 				struct batman_packet *batman_packet,
 				unsigned char *hna_buff, int hna_buff_len,
-				struct batman_if *if_incoming);
+				struct hard_iface *if_incoming);
 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);
-int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
-			 int hdr_size);
-int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if);
-int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if);
-int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if);
-int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if);
-int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if);
-int recv_bat_packet(struct sk_buff *skb, struct batman_if *recv_if);
+int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if);
+int recv_bat_packet(struct sk_buff *skb, struct hard_iface *recv_if);
 struct neigh_node *find_router(struct bat_priv *bat_priv,
-		struct orig_node *orig_node, struct batman_if *recv_if);
-void update_bonding_candidates(struct orig_node *orig_node);
+			       struct orig_node *orig_node,
+			       struct hard_iface *recv_if);
+void bonding_candidate_del(struct orig_node *orig_node,
+			   struct neigh_node *neigh_node);
 
 #endif /* _NET_BATMAN_ADV_ROUTING_H_ */

net/batman-adv/send.h

@@ -23,17 +23,17 @@
 #define _NET_BATMAN_ADV_SEND_H_
 
 int send_skb_packet(struct sk_buff *skb,
-				struct batman_if *batman_if,
+				struct hard_iface *hard_iface,
 				uint8_t *dst_addr);
-void schedule_own_packet(struct batman_if *batman_if);
+void schedule_own_packet(struct hard_iface *hard_iface);
 void schedule_forward_packet(struct orig_node *orig_node,
 			     struct ethhdr *ethhdr,
 			     struct batman_packet *batman_packet,
 			     uint8_t directlink, int hna_buff_len,
-			     struct batman_if *if_outgoing);
+			     struct hard_iface *if_outgoing);
 int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb);
 void send_outstanding_bat_packet(struct work_struct *work);
 void purge_outstanding_packets(struct bat_priv *bat_priv,
-			       struct batman_if *batman_if);
+			       struct hard_iface *hard_iface);
 
 #endif /* _NET_BATMAN_ADV_SEND_H_ */

net/batman-adv/soft-interface.c

@@ -29,14 +29,12 @@
 #include "hash.h"
 #include "gateway_common.h"
 #include "gateway_client.h"
-#include "send.h"
 #include "bat_sysfs.h"
 #include <linux/slab.h>
 #include <linux/ethtool.h>
 #include <linux/etherdevice.h>
 #include <linux/if_vlan.h>
 #include "unicast.h"
-#include "routing.h"
 
 
 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
@@ -78,20 +76,18 @@ int my_skb_head_push(struct sk_buff *skb, unsigned int len)
 	return 0;
 }
 
-static void softif_neigh_free_ref(struct kref *refcount)
+static void softif_neigh_free_rcu(struct rcu_head *rcu)
 {
 	struct softif_neigh *softif_neigh;
 
-	softif_neigh = container_of(refcount, struct softif_neigh, refcount);
+	softif_neigh = container_of(rcu, struct softif_neigh, rcu);
 	kfree(softif_neigh);
 }
 
-static void softif_neigh_free_rcu(struct rcu_head *rcu)
+static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
 {
-	struct softif_neigh *softif_neigh;
-
-	softif_neigh = container_of(rcu, struct softif_neigh, rcu);
-	kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+	if (atomic_dec_and_test(&softif_neigh->refcount))
+		call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
 }
 
 void softif_neigh_purge(struct bat_priv *bat_priv)
@@ -118,11 +114,10 @@ void softif_neigh_purge(struct bat_priv *bat_priv)
 				 softif_neigh->addr, softif_neigh->vid);
 			softif_neigh_tmp = bat_priv->softif_neigh;
 			bat_priv->softif_neigh = NULL;
-			kref_put(&softif_neigh_tmp->refcount,
-				 softif_neigh_free_ref);
+			softif_neigh_free_ref(softif_neigh_tmp);
 		}
 
-		call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
+		softif_neigh_free_ref(softif_neigh);
 	}
 
 	spin_unlock_bh(&bat_priv->softif_neigh_lock);
@@ -137,14 +132,17 @@ static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(softif_neigh, node,
 				 &bat_priv->softif_neigh_list, list) {
-		if (memcmp(softif_neigh->addr, addr, ETH_ALEN) != 0)
+		if (!compare_eth(softif_neigh->addr, addr))
 			continue;
 
 		if (softif_neigh->vid != vid)
 			continue;
 
+		if (!atomic_inc_not_zero(&softif_neigh->refcount))
+			continue;
+
 		softif_neigh->last_seen = jiffies;
-		goto found;
+		goto out;
 	}
 
 	softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
@@ -154,15 +152,14 @@ static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
 	memcpy(softif_neigh->addr, addr, ETH_ALEN);
 	softif_neigh->vid = vid;
 	softif_neigh->last_seen = jiffies;
-	kref_init(&softif_neigh->refcount);
+	/* initialize with 2 - caller decrements counter by one */
+	atomic_set(&softif_neigh->refcount, 2);
 
 	INIT_HLIST_NODE(&softif_neigh->list);
 	spin_lock_bh(&bat_priv->softif_neigh_lock);
 	hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
 	spin_unlock_bh(&bat_priv->softif_neigh_lock);
 
-found:
-	kref_get(&softif_neigh->refcount);
 out:
 	rcu_read_unlock();
 	return softif_neigh;
@@ -174,8 +171,6 @@ 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;
-	size_t buf_size, pos;
-	char *buff;
 
 	if (!bat_priv->primary_if) {
 		return seq_printf(seq, "BATMAN mesh %s disabled - "
@@ -185,33 +180,15 @@ int softif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 
 	seq_printf(seq, "Softif neighbor list (%s)\n", net_dev->name);
 
-	buf_size = 1;
-	/* Estimate length for: "   xx:xx:xx:xx:xx:xx\n" */
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(softif_neigh, node,
 				 &bat_priv->softif_neigh_list, list)
-		buf_size += 30;
-	rcu_read_unlock();
-
-	buff = kmalloc(buf_size, GFP_ATOMIC);
-	if (!buff)
-		return -ENOMEM;
-
-	buff[0] = '\0';
-	pos = 0;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(softif_neigh, node,
-				 &bat_priv->softif_neigh_list, list) {
-		pos += snprintf(buff + pos, 31, "%s %pM (vid: %d)\n",
+		seq_printf(seq, "%s %pM (vid: %d)\n",
 				bat_priv->softif_neigh == softif_neigh
 				? "=>" : "  ", softif_neigh->addr,
 				softif_neigh->vid);
-	}
 	rcu_read_unlock();
 
-	seq_printf(seq, "%s", buff);
-	kfree(buff);
 	return 0;
 }
 
@@ -266,7 +243,7 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 			 softif_neigh->addr, softif_neigh->vid);
 		softif_neigh_tmp = bat_priv->softif_neigh;
 		bat_priv->softif_neigh = softif_neigh;
-		kref_put(&softif_neigh_tmp->refcount, softif_neigh_free_ref);
+		softif_neigh_free_ref(softif_neigh_tmp);
 		/* we need to hold the additional reference */
 		goto err;
 	}
@@ -284,7 +261,7 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
 	}
 
 out:
-	kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+	softif_neigh_free_ref(softif_neigh);
 err:
 	kfree_skb(skb);
 	return;
@@ -437,7 +414,7 @@ int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
 }
 
 void interface_rx(struct net_device *soft_iface,
-		  struct sk_buff *skb, struct batman_if *recv_if,
+		  struct sk_buff *skb, struct hard_iface *recv_if,
 		  int hdr_size)
 {
 	struct bat_priv *bat_priv = netdev_priv(soft_iface);
@@ -485,7 +462,7 @@ void interface_rx(struct net_device *soft_iface,
 
 		memcpy(unicast_packet->dest,
 		       bat_priv->softif_neigh->addr, ETH_ALEN);
-		ret = route_unicast_packet(skb, recv_if, hdr_size);
+		ret = route_unicast_packet(skb, recv_if);
 		if (ret == NET_RX_DROP)
 			goto dropped;
 
@@ -645,6 +622,19 @@ void softif_destroy(struct net_device *soft_iface)
 	unregister_netdevice(soft_iface);
 }
 
+int softif_is_valid(struct net_device *net_dev)
+{
+#ifdef HAVE_NET_DEVICE_OPS
+	if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
+		return 1;
+#else
+	if (net_dev->hard_start_xmit == interface_tx)
+		return 1;
+#endif
+
+	return 0;
+}
+
 /* ethtool */
 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 {

net/batman-adv/soft-interface.h

@@ -27,9 +27,10 @@ int softif_neigh_seq_print_text(struct seq_file *seq, void *offset);
 void softif_neigh_purge(struct bat_priv *bat_priv);
 int interface_tx(struct sk_buff *skb, struct net_device *soft_iface);
 void interface_rx(struct net_device *soft_iface,
-		  struct sk_buff *skb, struct batman_if *recv_if,
+		  struct sk_buff *skb, struct hard_iface *recv_if,
 		  int hdr_size);
 struct net_device *softif_create(char *name);
 void softif_destroy(struct net_device *soft_iface);
+int softif_is_valid(struct net_device *net_dev);
 
 #endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */

net/batman-adv/types.h

@@ -33,7 +33,7 @@
 	 sizeof(struct bcast_packet))))
 
 
-struct batman_if {
+struct hard_iface {
 	struct list_head list;
 	int16_t if_num;
 	char if_status;
@@ -43,7 +43,7 @@ struct batman_if {
 	unsigned char *packet_buff;
 	int packet_len;
 	struct kobject *hardif_obj;
-	struct kref refcount;
+	atomic_t refcount;
 	struct packet_type batman_adv_ptype;
 	struct net_device *soft_iface;
 	struct rcu_head rcu;
@@ -70,8 +70,6 @@ struct orig_node {
 	struct neigh_node *router;
 	unsigned long *bcast_own;
 	uint8_t *bcast_own_sum;
-	uint8_t tq_own;
-	int tq_asym_penalty;
 	unsigned long last_valid;
 	unsigned long bcast_seqno_reset;
 	unsigned long batman_seqno_reset;
@@ -83,20 +81,28 @@ struct orig_node {
 	uint8_t last_ttl;
 	unsigned long bcast_bits[NUM_WORDS];
 	uint32_t last_bcast_seqno;
-	struct list_head neigh_list;
+	struct hlist_head neigh_list;
 	struct list_head frag_list;
+	spinlock_t neigh_list_lock; /* protects neighbor list */
+	atomic_t refcount;
+	struct rcu_head rcu;
+	struct hlist_node hash_entry;
+	struct bat_priv *bat_priv;
 	unsigned long last_frag_packet;
-	struct {
-		uint8_t candidates;
-		struct neigh_node *selected;
-	} bond;
+	spinlock_t ogm_cnt_lock; /* protects: bcast_own, bcast_own_sum,
+				  * neigh_node->real_bits,
+				  * neigh_node->real_packet_count */
+	spinlock_t bcast_seqno_lock; /* protects bcast_bits,
+				      *	 last_bcast_seqno */
+	atomic_t bond_candidates;
+	struct list_head bond_list;
 };
 
 struct gw_node {
 	struct hlist_node list;
 	struct orig_node *orig_node;
 	unsigned long deleted;
-	struct kref refcount;
+	atomic_t refcount;
 	struct rcu_head rcu;
 };
 
@@ -105,18 +111,20 @@ struct gw_node {
  *	@last_valid: when last packet via this neighbor was received
  */
 struct neigh_node {
-	struct list_head list;
+	struct hlist_node list;
 	uint8_t addr[ETH_ALEN];
 	uint8_t real_packet_count;
 	uint8_t tq_recv[TQ_GLOBAL_WINDOW_SIZE];
 	uint8_t tq_index;
 	uint8_t tq_avg;
 	uint8_t last_ttl;
-	struct neigh_node *next_bond_candidate;
+	struct list_head bonding_list;
 	unsigned long last_valid;
 	unsigned long real_bits[NUM_WORDS];
+	atomic_t refcount;
+	struct rcu_head rcu;
 	struct orig_node *orig_node;
-	struct batman_if *if_incoming;
+	struct hard_iface *if_incoming;
 };
 
 
@@ -140,7 +148,7 @@ struct bat_priv {
 	struct hlist_head softif_neigh_list;
 	struct softif_neigh *softif_neigh;
 	struct debug_log *debug_log;
-	struct batman_if *primary_if;
+	struct hard_iface *primary_if;
 	struct kobject *mesh_obj;
 	struct dentry *debug_dir;
 	struct hlist_head forw_bat_list;
@@ -151,12 +159,11 @@ struct bat_priv {
 	struct hashtable_t *hna_local_hash;
 	struct hashtable_t *hna_global_hash;
 	struct hashtable_t *vis_hash;
-	spinlock_t orig_hash_lock; /* protects orig_hash */
 	spinlock_t forw_bat_list_lock; /* protects forw_bat_list */
 	spinlock_t forw_bcast_list_lock; /* protects  */
 	spinlock_t hna_lhash_lock; /* protects hna_local_hash */
 	spinlock_t hna_ghash_lock; /* protects hna_global_hash */
-	spinlock_t gw_list_lock; /* protects gw_list */
+	spinlock_t gw_list_lock; /* protects gw_list and curr_gw */
 	spinlock_t vis_hash_lock; /* protects vis_hash */
 	spinlock_t vis_list_lock; /* protects vis_info::recv_list */
 	spinlock_t softif_neigh_lock; /* protects soft-interface neigh list */
@@ -165,7 +172,7 @@ struct bat_priv {
 	struct delayed_work hna_work;
 	struct delayed_work orig_work;
 	struct delayed_work vis_work;
-	struct gw_node *curr_gw;
+	struct gw_node __rcu *curr_gw;  /* rcu protected pointer */
 	struct vis_info *my_vis_info;
 };
 
@@ -188,11 +195,13 @@ struct hna_local_entry {
 	uint8_t addr[ETH_ALEN];
 	unsigned long last_seen;
 	char never_purge;
+	struct hlist_node hash_entry;
 };
 
 struct hna_global_entry {
 	uint8_t addr[ETH_ALEN];
 	struct orig_node *orig_node;
+	struct hlist_node hash_entry;
 };
 
 /**
@@ -208,7 +217,7 @@ struct forw_packet {
 	uint32_t direct_link_flags;
 	uint8_t num_packets;
 	struct delayed_work delayed_work;
-	struct batman_if *if_incoming;
+	struct hard_iface *if_incoming;
 };
 
 /* While scanning for vis-entries of a particular vis-originator
@@ -242,6 +251,7 @@ struct vis_info {
 			     * from.  we should not reply to them. */
 	struct list_head send_list;
 	struct kref refcount;
+	struct hlist_node hash_entry;
 	struct bat_priv *bat_priv;
 	/* this packet might be part of the vis send queue. */
 	struct sk_buff *skb_packet;
@@ -264,7 +274,7 @@ struct softif_neigh {
 	uint8_t addr[ETH_ALEN];
 	unsigned long last_seen;
 	short vid;
-	struct kref refcount;
+	atomic_t refcount;
 	struct rcu_head rcu;
 };
 

net/batman-adv/unicast.c

@@ -183,15 +183,10 @@ int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
 		(struct unicast_frag_packet *)skb->data;
 
 	*new_skb = NULL;
-	spin_lock_bh(&bat_priv->orig_hash_lock);
-	orig_node = ((struct orig_node *)
-		    hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
-			      unicast_packet->orig));
 
-	if (!orig_node) {
-		pr_debug("couldn't find originator in orig_hash\n");
+	orig_node = orig_hash_find(bat_priv, unicast_packet->orig);
+	if (!orig_node)
 		goto out;
-	}
 
 	orig_node->last_frag_packet = jiffies;
 
@@ -215,14 +210,15 @@ int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
 	/* if not, merge failed */
 	if (*new_skb)
 		ret = NET_RX_SUCCESS;
-out:
-	spin_unlock_bh(&bat_priv->orig_hash_lock);
 
+out:
+	if (orig_node)
+		orig_node_free_ref(orig_node);
 	return ret;
 }
 
 int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
-		  struct batman_if *batman_if, uint8_t dstaddr[])
+		  struct hard_iface *hard_iface, uint8_t dstaddr[])
 {
 	struct unicast_packet tmp_uc, *unicast_packet;
 	struct sk_buff *frag_skb;
@@ -267,12 +263,12 @@ int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
 	frag1->flags = UNI_FRAG_HEAD | large_tail;
 	frag2->flags = large_tail;
 
-	seqno = atomic_add_return(2, &batman_if->frag_seqno);
+	seqno = atomic_add_return(2, &hard_iface->frag_seqno);
 	frag1->seqno = htons(seqno - 1);
 	frag2->seqno = htons(seqno);
 
-	send_skb_packet(skb, batman_if, dstaddr);
-	send_skb_packet(frag_skb, batman_if, dstaddr);
+	send_skb_packet(skb, hard_iface, dstaddr);
+	send_skb_packet(frag_skb, hard_iface, dstaddr);
 	return NET_RX_SUCCESS;
 
 drop_frag:
@@ -286,40 +282,37 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 {
 	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 	struct unicast_packet *unicast_packet;
-	struct orig_node *orig_node = NULL;
-	struct batman_if *batman_if;
-	struct neigh_node *router;
+	struct orig_node *orig_node;
+	struct neigh_node *neigh_node;
 	int data_len = skb->len;
-	uint8_t dstaddr[6];
-
-	spin_lock_bh(&bat_priv->orig_hash_lock);
+	int ret = 1;
 
 	/* get routing information */
-	if (is_multicast_ether_addr(ethhdr->h_dest))
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
 		orig_node = (struct orig_node *)gw_get_selected(bat_priv);
+		if (orig_node)
+			goto find_router;
+	}
 
-	/* check for hna host */
-	if (!orig_node)
-		orig_node = transtable_search(bat_priv, ethhdr->h_dest);
-
-	router = find_router(bat_priv, orig_node, NULL);
-
-	if (!router)
-		goto unlock;
-
-	/* don't lock while sending the packets ... we therefore
-		* copy the required data before sending */
+	/* check for hna host - increases orig_node refcount */
+	orig_node = transtable_search(bat_priv, ethhdr->h_dest);
 
-	batman_if = router->if_incoming;
-	memcpy(dstaddr, router->addr, ETH_ALEN);
+find_router:
+	/**
+	 * find_router():
+	 *  - if orig_node is NULL it returns NULL
+	 *  - increases neigh_nodes refcount if found.
+	 */
+	neigh_node = find_router(bat_priv, orig_node, NULL);
 
-	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	if (!neigh_node)
+		goto out;
 
-	if (batman_if->if_status != IF_ACTIVE)
-		goto dropped;
+	if (neigh_node->if_incoming->if_status != IF_ACTIVE)
+		goto out;
 
 	if (my_skb_head_push(skb, sizeof(struct unicast_packet)) < 0)
-		goto dropped;
+		goto out;
 
 	unicast_packet = (struct unicast_packet *)skb->data;
 
@@ -333,18 +326,24 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
 
 	if (atomic_read(&bat_priv->fragmentation) &&
 	    data_len + sizeof(struct unicast_packet) >
-	    batman_if->net_dev->mtu) {
+				neigh_node->if_incoming->net_dev->mtu) {
 		/* send frag skb decreases ttl */
 		unicast_packet->ttl++;
-		return frag_send_skb(skb, bat_priv, batman_if,
-				     dstaddr);
+		ret = frag_send_skb(skb, bat_priv,
+				    neigh_node->if_incoming, neigh_node->addr);
+		goto out;
 	}
-	send_skb_packet(skb, batman_if, dstaddr);
-	return 0;
 
-unlock:
-	spin_unlock_bh(&bat_priv->orig_hash_lock);
-dropped:
-	kfree_skb(skb);
-	return 1;
+	send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+	ret = 0;
+	goto out;
+
+out:
+	if (neigh_node)
+		neigh_node_free_ref(neigh_node);
+	if (orig_node)
+		orig_node_free_ref(orig_node);
+	if (ret == 1)
+		kfree_skb(skb);
+	return ret;
 }

net/batman-adv/unicast.h

@@ -32,7 +32,7 @@ int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
 void frag_list_free(struct list_head *head);
 int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv);
 int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
-		  struct batman_if *batman_if, uint8_t dstaddr[]);
+		  struct hard_iface *hard_iface, uint8_t dstaddr[]);
 
 static inline int frag_can_reassemble(struct sk_buff *skb, int mtu)
 {