Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge

Antonio Quartulli says:

====================
Included changes:
- remove useless skb size check in batadv_interface_rx
- basic netns support introduced by Andrew Lunn:
    - prevent virtual interface from changing netns by setting
      NETIF_F_NETNS_LOCAL
    - create virtual interface within the netns of the first
      hard-interface
- introduce detection of complex bridge loops and report event
  to the user (via udev) when the Bridge Loop Avoidance mechanism
  can't prevent them
- minor reference counting bugfixes for the hard_iface object that
  couldn't make it via the net tree
- use kref_get() instead of kref_get_unless_zero() to make reference
  counting bug more visible
- use batadv_compare_eth() all over the code when possible instead of
  plain memcmp()
- minor code cleanup and style adjustments
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/batman-adv/bat_iv_ogm.c

@@ -681,18 +681,12 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 	unsigned char *skb_buff;
 	unsigned int skb_size;
 
-	if (!kref_get_unless_zero(&if_incoming->refcount))
-		return;
-
-	if (!kref_get_unless_zero(&if_outgoing->refcount))
-		goto out_free_incoming;
-
 	/* own packet should always be scheduled */
 	if (!own_packet) {
 		if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 			batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 				   "batman packet queue full\n");
-			goto out_free_outgoing;
+			return;
 		}
 	}
 
@@ -718,6 +712,8 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 	forw_packet_aggr->packet_len = packet_len;
 	memcpy(skb_buff, packet_buff, packet_len);
 
+	kref_get(&if_incoming->refcount);
+	kref_get(&if_outgoing->refcount);
 	forw_packet_aggr->own = own_packet;
 	forw_packet_aggr->if_incoming = if_incoming;
 	forw_packet_aggr->if_outgoing = if_outgoing;
@@ -747,10 +743,6 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 out_nomem:
 	if (!own_packet)
 		atomic_inc(&bat_priv->batman_queue_left);
-out_free_outgoing:
-	batadv_hardif_put(if_outgoing);
-out_free_incoming:
-	batadv_hardif_put(if_incoming);
 }
 
 /* aggregate a new packet into the existing ogm packet */
@@ -987,9 +979,15 @@ static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 	list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
 		if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
 			continue;
+
+		if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
+			continue;
+
 		batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
 					*ogm_buff_len, hard_iface,
 					tmp_hard_iface, 1, send_time);
+
+		batadv_hardif_put(tmp_hard_iface);
 	}
 	rcu_read_unlock();
 
@@ -1170,13 +1168,13 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
  * @if_incoming: interface where the packet was received
  * @if_outgoing: interface for which the retransmission should be considered
  *
- * Return: 1 if the link can be considered bidirectional, 0 otherwise
+ * Return: true if the link can be considered bidirectional, false otherwise
  */
-static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
-				 struct batadv_orig_node *orig_neigh_node,
-				 struct batadv_ogm_packet *batadv_ogm_packet,
-				 struct batadv_hard_iface *if_incoming,
-				 struct batadv_hard_iface *if_outgoing)
+static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
+				  struct batadv_orig_node *orig_neigh_node,
+				  struct batadv_ogm_packet *batadv_ogm_packet,
+				  struct batadv_hard_iface *if_incoming,
+				  struct batadv_hard_iface *if_outgoing)
 {
 	struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 	struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
@@ -1184,9 +1182,10 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 	u8 total_count;
 	u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
 	unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
-	int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
+	int tq_asym_penalty, inv_asym_penalty, if_num;
 	unsigned int combined_tq;
 	int tq_iface_penalty;
+	bool ret = false;
 
 	/* find corresponding one hop neighbor */
 	rcu_read_lock();
@@ -1298,7 +1297,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 	 * consider it bidirectional
 	 */
 	if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
-		ret = 1;
+		ret = true;
 
 out:
 	if (neigh_node)
@@ -1327,9 +1326,9 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 	struct batadv_orig_ifinfo *orig_ifinfo = NULL;
 	struct batadv_neigh_node *neigh_node;
 	struct batadv_neigh_ifinfo *neigh_ifinfo;
-	int is_dup;
+	bool is_dup;
 	s32 seq_diff;
-	int need_update = 0;
+	bool need_update = false;
 	int set_mark;
 	enum batadv_dup_status ret = BATADV_NO_DUP;
 	u32 seqno = ntohl(batadv_ogm_packet->seqno);
@@ -1439,7 +1438,7 @@ batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
 	struct sk_buff *skb_priv;
 	struct ethhdr *ethhdr;
 	u8 *prev_sender;
-	int is_bidirect;
+	bool is_bidirect;
 
 	/* create a private copy of the skb, as some functions change tq value
 	 * and/or flags.
@@ -1767,8 +1766,13 @@ static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
 		if (hard_iface->soft_iface != bat_priv->soft_iface)
 			continue;
 
+		if (!kref_get_unless_zero(&hard_iface->refcount))
+			continue;
+
 		batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
 						if_incoming, hard_iface);
+
+		batadv_hardif_put(hard_iface);
 	}
 	rcu_read_unlock();
 

net/batman-adv/bat_v_ogm.c

@@ -26,6 +26,7 @@
 #include <linux/if_ether.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
+#include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/netdevice.h>
 #include <linux/random.h>
@@ -176,6 +177,9 @@ static void batadv_v_ogm_send(struct work_struct *work)
 		if (hard_iface->soft_iface != bat_priv->soft_iface)
 			continue;
 
+		if (!kref_get_unless_zero(&hard_iface->refcount))
+			continue;
+
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n",
 			   ogm_packet->orig, ntohl(ogm_packet->seqno),
@@ -185,10 +189,13 @@ static void batadv_v_ogm_send(struct work_struct *work)
 
 		/* this skb gets consumed by batadv_v_ogm_send_to_if() */
 		skb_tmp = skb_clone(skb, GFP_ATOMIC);
-		if (!skb_tmp)
+		if (!skb_tmp) {
+			batadv_hardif_put(hard_iface);
 			break;
+		}
 
 		batadv_v_ogm_send_to_if(skb_tmp, hard_iface);
+		batadv_hardif_put(hard_iface);
 	}
 	rcu_read_unlock();
 
@@ -704,9 +711,14 @@ static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset,
 		if (hard_iface->soft_iface != bat_priv->soft_iface)
 			continue;
 
+		if (!kref_get_unless_zero(&hard_iface->refcount))
+			continue;
+
 		batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet,
 					       orig_node, neigh_node,
 					       if_incoming, hard_iface);
+
+		batadv_hardif_put(hard_iface);
 	}
 	rcu_read_unlock();
 out:

net/batman-adv/bitarray.c

@@ -38,11 +38,11 @@ static void batadv_bitmap_shift_left(unsigned long *seq_bits, s32 n)
  *  the last sequence number
  * @set_mark: whether this packet should be marked in seq_bits
  *
- * Return: 1 if the window was moved (either new or very old),
- *  0 if the window was not moved/shifted.
+ * Return: true if the window was moved (either new or very old),
+ *  false if the window was not moved/shifted.
  */
-int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
-			  int set_mark)
+bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
+			   s32 seq_num_diff, int set_mark)
 {
 	struct batadv_priv *bat_priv = priv;
 
@@ -52,7 +52,7 @@ int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
 	if (seq_num_diff <= 0 && seq_num_diff > -BATADV_TQ_LOCAL_WINDOW_SIZE) {
 		if (set_mark)
 			batadv_set_bit(seq_bits, -seq_num_diff);
-		return 0;
+		return false;
 	}
 
 	/* sequence number is slightly newer, so we shift the window and
@@ -63,7 +63,7 @@ int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
 
 		if (set_mark)
 			batadv_set_bit(seq_bits, 0);
-		return 1;
+		return true;
 	}
 
 	/* sequence number is much newer, probably missed a lot of packets */
@@ -75,7 +75,7 @@ int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
 		bitmap_zero(seq_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);
 		if (set_mark)
 			batadv_set_bit(seq_bits, 0);
-		return 1;
+		return true;
 	}
 
 	/* received a much older packet. The other host either restarted
@@ -94,5 +94,5 @@ int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
 	if (set_mark)
 		batadv_set_bit(seq_bits, 0);
 
-	return 1;
+	return true;
 }

net/batman-adv/bitarray.h

@@ -22,6 +22,7 @@
 
 #include <linux/bitops.h>
 #include <linux/compiler.h>
+#include <linux/stddef.h>
 #include <linux/types.h>
 
 /**
@@ -31,17 +32,17 @@
  * @last_seqno: latest sequence number in seq_bits
  * @curr_seqno: sequence number to test for
  *
- * Return: 1 if the corresponding bit in the given seq_bits indicates true
- * and curr_seqno is within range of last_seqno. Otherwise returns 0.
+ * Return: true if the corresponding bit in the given seq_bits indicates true
+ * and curr_seqno is within range of last_seqno. Otherwise returns false.
  */
-static inline int batadv_test_bit(const unsigned long *seq_bits,
-				  u32 last_seqno, u32 curr_seqno)
+static inline bool batadv_test_bit(const unsigned long *seq_bits,
+				   u32 last_seqno, u32 curr_seqno)
 {
 	s32 diff;
 
 	diff = last_seqno - curr_seqno;
 	if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
-		return 0;
+		return false;
 	return test_bit(diff, seq_bits) != 0;
 }
 
@@ -55,7 +56,7 @@ static inline void batadv_set_bit(unsigned long *seq_bits, s32 n)
 	set_bit(n, seq_bits); /* turn the position on */
 }
 
-int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff,
-			  int set_mark);
+bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
+			   s32 seq_num_diff, int set_mark);
 
 #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */

net/batman-adv/bridge_loop_avoidance.h

@@ -27,19 +27,20 @@ struct seq_file;
 struct sk_buff;
 
 #ifdef CONFIG_BATMAN_ADV_BLA
-int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
-		  unsigned short vid, bool is_bcast);
-int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
-		  unsigned short vid);
-int batadv_bla_is_backbone_gw(struct sk_buff *skb,
-			      struct batadv_orig_node *orig_node, int hdr_size);
+bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		   unsigned short vid, bool is_bcast);
+bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		   unsigned short vid);
+bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
+			       struct batadv_orig_node *orig_node,
+			       int hdr_size);
 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset);
 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq,
 					     void *offset);
 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
 				    unsigned short vid);
-int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
-				   struct sk_buff *skb);
+bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
+				    struct sk_buff *skb);
 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
 				    struct batadv_hard_iface *primary_if,
 				    struct batadv_hard_iface *oldif);
@@ -50,24 +51,24 @@ void batadv_bla_free(struct batadv_priv *bat_priv);
 #define BATADV_BLA_CRC_INIT	0
 #else /* ifdef CONFIG_BATMAN_ADV_BLA */
 
-static inline int batadv_bla_rx(struct batadv_priv *bat_priv,
-				struct sk_buff *skb, unsigned short vid,
-				bool is_bcast)
+static inline bool batadv_bla_rx(struct batadv_priv *bat_priv,
+				 struct sk_buff *skb, unsigned short vid,
+				 bool is_bcast)
 {
-	return 0;
+	return false;
 }
 
-static inline int batadv_bla_tx(struct batadv_priv *bat_priv,
-				struct sk_buff *skb, unsigned short vid)
+static inline bool batadv_bla_tx(struct batadv_priv *bat_priv,
+				 struct sk_buff *skb, unsigned short vid)
 {
-	return 0;
+	return false;
 }
 
-static inline int batadv_bla_is_backbone_gw(struct sk_buff *skb,
-					    struct batadv_orig_node *orig_node,
-					    int hdr_size)
+static inline bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
+					     struct batadv_orig_node *orig_node,
+					     int hdr_size)
 {
-	return 0;
+	return false;
 }
 
 static inline int batadv_bla_claim_table_seq_print_text(struct seq_file *seq,
@@ -88,11 +89,11 @@ static inline bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv,
 	return false;
 }
 
-static inline int
+static inline bool
 batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
 			       struct sk_buff *skb)
 {
-	return 0;
+	return false;
 }
 
 static inline void

net/batman-adv/debugfs.c

@@ -134,7 +134,7 @@ static int batadv_log_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static int batadv_log_empty(struct batadv_priv_debug_log *debug_log)
+static bool batadv_log_empty(struct batadv_priv_debug_log *debug_log)
 {
 	return !(debug_log->log_start - debug_log->log_end);
 }

net/batman-adv/distributed-arp-table.c

@@ -165,14 +165,14 @@ static void batadv_dat_purge(struct work_struct *work)
  * @node: node in the local table
  * @data2: second object to compare the node to
  *
- * Return: 1 if the two entries are the same, 0 otherwise.
+ * Return: true if the two entries are the same, false otherwise.
  */
-static int batadv_compare_dat(const struct hlist_node *node, const void *data2)
+static bool batadv_compare_dat(const struct hlist_node *node, const void *data2)
 {
 	const void *data1 = container_of(node, struct batadv_dat_entry,
 					 hash_entry);
 
-	return memcmp(data1, data2, sizeof(__be32)) == 0 ? 1 : 0;
+	return memcmp(data1, data2, sizeof(__be32)) == 0;
 }
 
 /**

net/batman-adv/gateway_client.c

@@ -135,8 +135,8 @@ static void batadv_gw_select(struct batadv_priv *bat_priv,
 
 	spin_lock_bh(&bat_priv->gw.list_lock);
 
-	if (new_gw_node && !kref_get_unless_zero(&new_gw_node->refcount))
-		new_gw_node = NULL;
+	if (new_gw_node)
+		kref_get(&new_gw_node->refcount);
 
 	curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
 	rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);
@@ -440,15 +440,11 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv,
 	if (gateway->bandwidth_down == 0)
 		return;
 
-	if (!kref_get_unless_zero(&orig_node->refcount))
-		return;
-
 	gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
-	if (!gw_node) {
-		batadv_orig_node_put(orig_node);
+	if (!gw_node)
 		return;
-	}
 
+	kref_get(&orig_node->refcount);
 	INIT_HLIST_NODE(&gw_node->list);
 	gw_node->orig_node = orig_node;
 	gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);

net/batman-adv/hard-interface.c

@@ -36,7 +36,6 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
-#include <net/net_namespace.h>
 
 #include "bridge_loop_avoidance.h"
 #include "debugfs.h"
@@ -121,6 +120,7 @@ static bool batadv_mutual_parents(const struct net_device *dev1,
 static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 {
 	struct net_device *parent_dev;
+	struct net *net = dev_net(net_dev);
 	bool ret;
 
 	/* check if this is a batman-adv mesh interface */
@@ -133,7 +133,7 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 		return false;
 
 	/* recurse over the parent device */
-	parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
+	parent_dev = __dev_get_by_index(net, dev_get_iflink(net_dev));
 	/* if we got a NULL parent_dev there is something broken.. */
 	if (WARN(!parent_dev, "Cannot find parent device"))
 		return false;
@@ -146,22 +146,22 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
 	return ret;
 }
 
-static int batadv_is_valid_iface(const struct net_device *net_dev)
+static bool batadv_is_valid_iface(const struct net_device *net_dev)
 {
 	if (net_dev->flags & IFF_LOOPBACK)
-		return 0;
+		return false;
 
 	if (net_dev->type != ARPHRD_ETHER)
-		return 0;
+		return false;
 
 	if (net_dev->addr_len != ETH_ALEN)
-		return 0;
+		return false;
 
 	/* no batman over batman */
 	if (batadv_is_on_batman_iface(net_dev))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 /**
@@ -236,8 +236,8 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 
 	ASSERT_RTNL();
 
-	if (new_hard_iface && !kref_get_unless_zero(&new_hard_iface->refcount))
-		new_hard_iface = NULL;
+	if (new_hard_iface)
+		kref_get(&new_hard_iface->refcount);
 
 	curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
 	rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
@@ -456,7 +456,7 @@ static int batadv_master_del_slave(struct batadv_hard_iface *slave,
 }
 
 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
-				   const char *iface_name)
+				   struct net *net, const char *iface_name)
 {
 	struct batadv_priv *bat_priv;
 	struct net_device *soft_iface, *master;
@@ -467,13 +467,12 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 		goto out;
 
-	if (!kref_get_unless_zero(&hard_iface->refcount))
-		goto out;
+	kref_get(&hard_iface->refcount);
 
-	soft_iface = dev_get_by_name(&init_net, iface_name);
+	soft_iface = dev_get_by_name(net, iface_name);
 
 	if (!soft_iface) {
-		soft_iface = batadv_softif_create(iface_name);
+		soft_iface = batadv_softif_create(net, iface_name);
 
 		if (!soft_iface) {
 			ret = -ENOMEM;
@@ -522,6 +521,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 		goto err_upper;
 	}
 
+	kref_get(&hard_iface->refcount);
 	hard_iface->batman_adv_ptype.type = ethertype;
 	hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
 	hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
@@ -583,6 +583,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 	batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
 		    hard_iface->net_dev->name);
 	dev_remove_pack(&hard_iface->batman_adv_ptype);
+	batadv_hardif_put(hard_iface);
 
 	bat_priv->num_ifaces--;
 	batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
@@ -652,8 +653,7 @@ batadv_hardif_add_interface(struct net_device *net_dev)
 
 	ASSERT_RTNL();
 
-	ret = batadv_is_valid_iface(net_dev);
-	if (ret != 1)
+	if (!batadv_is_valid_iface(net_dev))
 		goto out;
 
 	dev_hold(net_dev);

net/batman-adv/hard-interface.h

@@ -28,6 +28,7 @@
 #include <linux/types.h>
 
 struct net_device;
+struct net;
 
 enum batadv_hard_if_state {
 	BATADV_IF_NOT_IN_USE,
@@ -55,7 +56,7 @@ bool batadv_is_wifi_iface(int ifindex);
 struct batadv_hard_iface*
 batadv_hardif_get_by_netdev(const struct net_device *net_dev);
 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
-				   const char *iface_name);
+				   struct net *net, const char *iface_name);
 void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 				     enum batadv_hard_if_cleanup autodel);
 void batadv_hardif_remove_interfaces(void);

net/batman-adv/hash.h

@@ -32,10 +32,10 @@ struct lock_class_key;
 /* callback to a compare function.  should compare 2 element datas for their
  * keys
  *
- * Return: 0 if same and not 0 if not same
+ * Return: true if same and false if not same
  */
-typedef int (*batadv_hashdata_compare_cb)(const struct hlist_node *,
-					  const void *);
+typedef bool (*batadv_hashdata_compare_cb)(const struct hlist_node *,
+					   const void *);
 
 /* the hashfunction
  *

net/batman-adv/main.c

@@ -401,11 +401,19 @@ int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 
 	hard_iface = container_of(ptype, struct batadv_hard_iface,
 				  batman_adv_ptype);
+
+	/* Prevent processing a packet received on an interface which is getting
+	 * shut down otherwise the packet may trigger de-reference errors
+	 * further down in the receive path.
+	 */
+	if (!kref_get_unless_zero(&hard_iface->refcount))
+		goto err_out;
+
 	skb = skb_share_check(skb, GFP_ATOMIC);
 
 	/* skb was released by skb_share_check() */
 	if (!skb)
-		goto err_out;
+		goto err_put;
 
 	/* packet should hold at least type and version */
 	if (unlikely(!pskb_may_pull(skb, 2)))
@@ -448,6 +456,8 @@ int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 	if (ret == NET_RX_DROP)
 		kfree_skb(skb);
 
+	batadv_hardif_put(hard_iface);
+
 	/* return NET_RX_SUCCESS in any case as we
 	 * most probably dropped the packet for
 	 * routing-logical reasons.
@@ -456,6 +466,8 @@ int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 
 err_free:
 	kfree_skb(skb);
+err_put:
+	batadv_hardif_put(hard_iface);
 err_out:
 	return NET_RX_DROP;
 }
@@ -736,9 +748,7 @@ batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
 		if (tvlv_tmp->tvlv_hdr.version != version)
 			continue;
 
-		if (!kref_get_unless_zero(&tvlv_tmp->refcount))
-			continue;
-
+		kref_get(&tvlv_tmp->refcount);
 		tvlv = tvlv_tmp;
 		break;
 	}

net/batman-adv/main.h

@@ -120,6 +120,8 @@
 #define BATADV_BLA_BACKBONE_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 6)
 #define BATADV_BLA_CLAIM_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 10)
 #define BATADV_BLA_WAIT_PERIODS		3
+#define BATADV_BLA_LOOPDETECT_PERIODS	6
+#define BATADV_BLA_LOOPDETECT_TIMEOUT	3000	/* 3 seconds */
 
 #define BATADV_DUPLIST_SIZE		16
 #define BATADV_DUPLIST_TIMEOUT		500	/* 500 ms */
@@ -142,10 +144,12 @@ enum batadv_uev_action {
 	BATADV_UEV_ADD = 0,
 	BATADV_UEV_DEL,
 	BATADV_UEV_CHANGE,
+	BATADV_UEV_LOOPDETECT,
 };
 
 enum batadv_uev_type {
 	BATADV_UEV_GW = 0,
+	BATADV_UEV_BLA,
 };
 
 #define BATADV_GW_THRESHOLD	50
@@ -288,7 +292,7 @@ static inline void _batadv_dbg(int type __always_unused,
  *
  * note: can't use ether_addr_equal() as it requires aligned memory
  *
- * Return: 1 if they are the same ethernet addr
+ * Return: true if they are the same ethernet addr
  */
 static inline bool batadv_compare_eth(const void *data1, const void *data2)
 {

net/batman-adv/network-coding.c

@@ -510,10 +510,10 @@ static u32 batadv_nc_hash_choose(const void *data, u32 size)
  * @node: node in the local table
  * @data2: second object to compare the node to
  *
- * Return: 1 if the two entry are the same, 0 otherwise
+ * Return: true if the two entry are the same, false otherwise
  */
-static int batadv_nc_hash_compare(const struct hlist_node *node,
-				  const void *data2)
+static bool batadv_nc_hash_compare(const struct hlist_node *node,
+				   const void *data2)
 {
 	const struct batadv_nc_path *nc_path1, *nc_path2;
 
@@ -521,15 +521,13 @@ static int batadv_nc_hash_compare(const struct hlist_node *node,
 	nc_path2 = data2;
 
 	/* Return 1 if the two keys are identical */
-	if (memcmp(nc_path1->prev_hop, nc_path2->prev_hop,
-		   sizeof(nc_path1->prev_hop)) != 0)
-		return 0;
+	if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop))
+		return false;
 
-	if (memcmp(nc_path1->next_hop, nc_path2->next_hop,
-		   sizeof(nc_path1->next_hop)) != 0)
-		return 0;
+	if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop))
+		return false;
 
-	return 1;
+	return true;
 }
 
 /**
@@ -856,8 +854,7 @@ batadv_nc_get_nc_node(struct batadv_priv *bat_priv,
 	if (!nc_node)
 		return NULL;
 
-	if (!kref_get_unless_zero(&orig_neigh_node->refcount))
-		goto free;
+	kref_get(&orig_neigh_node->refcount);
 
 	/* Initialize nc_node */
 	INIT_LIST_HEAD(&nc_node->list);
@@ -884,10 +881,6 @@ batadv_nc_get_nc_node(struct batadv_priv *bat_priv,
 	spin_unlock_bh(lock);
 
 	return nc_node;
-
-free:
-	kfree(nc_node);
-	return NULL;
 }
 
 /**

net/batman-adv/originator.c

@@ -54,9 +54,9 @@ static void batadv_purge_orig(struct work_struct *work);
  * @node: node in the local table
  * @data2: second object to compare the node to
  *
- * Return: 1 if they are the same originator
+ * Return: true if they are the same originator
  */
-int batadv_compare_orig(const struct hlist_node *node, const void *data2)
+bool batadv_compare_orig(const struct hlist_node *node, const void *data2)
 {
 	const void *data1 = container_of(node, struct batadv_orig_node,
 					 hash_entry);
@@ -374,12 +374,8 @@ batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
 	if (!orig_ifinfo)
 		goto out;
 
-	if (if_outgoing != BATADV_IF_DEFAULT &&
-	    !kref_get_unless_zero(&if_outgoing->refcount)) {
-		kfree(orig_ifinfo);
-		orig_ifinfo = NULL;
-		goto out;
-	}
+	if (if_outgoing != BATADV_IF_DEFAULT)
+		kref_get(&if_outgoing->refcount);
 
 	reset_time = jiffies - 1;
 	reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
@@ -455,11 +451,8 @@ batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
 	if (!neigh_ifinfo)
 		goto out;
 
-	if (if_outgoing && !kref_get_unless_zero(&if_outgoing->refcount)) {
-		kfree(neigh_ifinfo);
-		neigh_ifinfo = NULL;
-		goto out;
-	}
+	if (if_outgoing)
+		kref_get(&if_outgoing->refcount);
 
 	INIT_HLIST_NODE(&neigh_ifinfo->list);
 	kref_init(&neigh_ifinfo->refcount);
@@ -532,15 +525,11 @@ batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
 	if (hardif_neigh)
 		goto out;
 
-	if (!kref_get_unless_zero(&hard_iface->refcount))
-		goto out;
-
 	hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC);
-	if (!hardif_neigh) {
-		batadv_hardif_put(hard_iface);
+	if (!hardif_neigh)
 		goto out;
-	}
 
+	kref_get(&hard_iface->refcount);
 	INIT_HLIST_NODE(&hardif_neigh->list);
 	ether_addr_copy(hardif_neigh->addr, neigh_addr);
 	hardif_neigh->if_incoming = hard_iface;
@@ -643,16 +632,11 @@ batadv_neigh_node_new(struct batadv_orig_node *orig_node,
 	if (!neigh_node)
 		goto out;
 
-	if (!kref_get_unless_zero(&hard_iface->refcount)) {
-		kfree(neigh_node);
-		neigh_node = NULL;
-		goto out;
-	}
-
 	INIT_HLIST_NODE(&neigh_node->list);
 	INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 	spin_lock_init(&neigh_node->ifinfo_lock);
 
+	kref_get(&hard_iface->refcount);
 	ether_addr_copy(neigh_node->addr, neigh_addr);
 	neigh_node->if_incoming = hard_iface;
 	neigh_node->orig_node = orig_node;
@@ -1160,6 +1144,9 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 		if (hard_iface->soft_iface != bat_priv->soft_iface)
 			continue;
 
+		if (!kref_get_unless_zero(&hard_iface->refcount))
+			continue;
+
 		best_neigh_node = batadv_find_best_neighbor(bat_priv,
 							    orig_node,
 							    hard_iface);
@@ -1167,6 +1154,8 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 				    best_neigh_node);
 		if (best_neigh_node)
 			batadv_neigh_node_put(best_neigh_node);
+
+		batadv_hardif_put(hard_iface);
 	}
 	rcu_read_unlock();
 

net/batman-adv/originator.h

@@ -33,7 +33,7 @@
 
 struct seq_file;
 
-int batadv_compare_orig(const struct hlist_node *node, const void *data2);
+bool batadv_compare_orig(const struct hlist_node *node, const void *data2);
 int batadv_originator_init(struct batadv_priv *bat_priv);
 void batadv_originator_free(struct batadv_priv *bat_priv);
 void batadv_purge_orig_ref(struct batadv_priv *bat_priv);

net/batman-adv/packet.h

@@ -175,6 +175,7 @@ enum batadv_bla_claimframe {
 	BATADV_CLAIM_TYPE_UNCLAIM	= 0x01,
 	BATADV_CLAIM_TYPE_ANNOUNCE	= 0x02,
 	BATADV_CLAIM_TYPE_REQUEST	= 0x03,
+	BATADV_CLAIM_TYPE_LOOPDETECT	= 0x04,
 };
 
 /**

net/batman-adv/routing.c

@@ -100,10 +100,6 @@ static void _batadv_update_route(struct batadv_priv *bat_priv,
 	if (curr_router)
 		batadv_neigh_node_put(curr_router);
 
-	/* increase refcount of new best neighbor */
-	if (neigh_node && !kref_get_unless_zero(&neigh_node->refcount))
-		neigh_node = NULL;
-
 	spin_lock_bh(&orig_node->neigh_list_lock);
 	/* curr_router used earlier may not be the current orig_ifinfo->router
 	 * anymore because it was dereferenced outside of the neigh_list_lock
@@ -114,6 +110,10 @@ static void _batadv_update_route(struct batadv_priv *bat_priv,
 	 */
 	curr_router = rcu_dereference_protected(orig_ifinfo->router, true);
 
+	/* increase refcount of new best neighbor */
+	if (neigh_node)
+		kref_get(&neigh_node->refcount);
+
 	rcu_assign_pointer(orig_ifinfo->router, neigh_node);
 	spin_unlock_bh(&orig_node->neigh_list_lock);
 	batadv_orig_ifinfo_put(orig_ifinfo);
@@ -163,18 +163,18 @@ void batadv_update_route(struct batadv_priv *bat_priv,
  *   doesn't change otherwise.
  *
  * Return:
- *  0 if the packet is to be accepted.
- *  1 if the packet is to be ignored.
+ *  false if the packet is to be accepted.
+ *  true if the packet is to be ignored.
  */
-int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
-			    s32 seq_old_max_diff, unsigned long *last_reset,
-			    bool *protection_started)
+bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
+			     s32 seq_old_max_diff, unsigned long *last_reset,
+			     bool *protection_started)
 {
 	if (seq_num_diff <= -seq_old_max_diff ||
 	    seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
 		if (!batadv_has_timed_out(*last_reset,
 					  BATADV_RESET_PROTECTION_MS))
-			return 1;
+			return true;
 
 		*last_reset = jiffies;
 		if (protection_started)
@@ -183,7 +183,7 @@ int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
 			   "old packet received, start protection\n");
 	}
 
-	return 0;
+	return false;
 }
 
 bool batadv_check_management_packet(struct sk_buff *skb,
@@ -718,8 +718,9 @@ batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
 	return ret;
 }
 
-static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
-				     struct sk_buff *skb, int hdr_len) {
+static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
+				      struct sk_buff *skb, int hdr_len)
+{
 	struct batadv_unicast_packet *unicast_packet;
 	struct batadv_hard_iface *primary_if;
 	struct batadv_orig_node *orig_node;
@@ -730,11 +731,11 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 
 	/* check if there is enough data before accessing it */
 	if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
-		return 0;
+		return false;
 
 	/* create a copy of the skb (in case of for re-routing) to modify it. */
 	if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
-		return 0;
+		return false;
 
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
 	vid = batadv_get_vid(skb, hdr_len);
@@ -758,7 +759,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 		 * table. If not, let the packet go untouched anyway because
 		 * there is nothing the node can do
 		 */
-		return 1;
+		return true;
 	}
 
 	/* retrieve the TTVN known by this node for the packet destination. This
@@ -774,7 +775,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 		 * not be possible to deliver it
 		 */
 		if (!orig_node)
-			return 0;
+			return false;
 
 		curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
 		batadv_orig_node_put(orig_node);
@@ -785,7 +786,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 	 */
 	is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
 	if (!is_old_ttvn)
-		return 1;
+		return true;
 
 	old_ttvn = unicast_packet->ttvn;
 	/* the packet was forged based on outdated network information. Its
@@ -798,7 +799,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 				       "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
 				       unicast_packet->dest, ethhdr->h_dest,
 				       old_ttvn, curr_ttvn);
-		return 1;
+		return true;
 	}
 
 	/* the packet has not been re-routed: either the destination is
@@ -806,14 +807,14 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 	 * it is possible to drop the packet
 	 */
 	if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
-		return 0;
+		return false;
 
 	/* update the header in order to let the packet be delivered to this
 	 * node's soft interface
 	 */
 	primary_if = batadv_primary_if_get_selected(bat_priv);
 	if (!primary_if)
-		return 0;
+		return false;
 
 	ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
 
@@ -821,7 +822,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 
 	unicast_packet->ttvn = curr_ttvn;
 
-	return 1;
+	return true;
 }
 
 /**
@@ -912,7 +913,7 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
 							hdr_size))
 			goto rx_success;
 
-		batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
+		batadv_interface_rx(recv_if->soft_iface, skb, hdr_size,
 				    orig_node);
 
 rx_success:
@@ -1122,8 +1123,7 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
 		goto rx_success;
 
 	/* broadcast for me */
-	batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
-			    orig_node);
+	batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node);
 
 rx_success:
 	ret = NET_RX_SUCCESS;

net/batman-adv/routing.h

@@ -51,8 +51,8 @@ struct batadv_neigh_node *
 batadv_find_router(struct batadv_priv *bat_priv,
 		   struct batadv_orig_node *orig_node,
 		   struct batadv_hard_iface *recv_if);
-int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
-			    s32 seq_old_max_diff, unsigned long *last_reset,
-			    bool *protection_started);
+bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
+			     s32 seq_old_max_diff, unsigned long *last_reset,
+			     bool *protection_started);
 
 #endif /* _NET_BATMAN_ADV_ROUTING_H_ */

net/batman-adv/send.c

@@ -26,6 +26,7 @@
 #include <linux/if.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
+#include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/netdevice.h>
 #include <linux/printk.h>
@@ -577,10 +578,15 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
 		if (forw_packet->num_packets >= hard_iface->num_bcasts)
 			continue;
 
+		if (!kref_get_unless_zero(&hard_iface->refcount))
+			continue;
+
 		/* send a copy of the saved skb */
 		skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 		if (skb1)
 			batadv_send_broadcast_skb(skb1, hard_iface);
+
+		batadv_hardif_put(hard_iface);
 	}
 	rcu_read_unlock();
 

net/batman-adv/soft-interface.c

@@ -186,7 +186,6 @@ static int batadv_interface_tx(struct sk_buff *skb,
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_bcast_packet *bcast_packet;
-	__be16 ethertype = htons(ETH_P_BATMAN);
 	static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 					      0x00, 0x00};
 	static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
@@ -216,7 +215,8 @@ static int batadv_interface_tx(struct sk_buff *skb,
 	case ETH_P_8021Q:
 		vhdr = vlan_eth_hdr(skb);
 
-		if (vhdr->h_vlan_encapsulated_proto != ethertype) {
+		/* drop batman-in-batman packets to prevent loops */
+		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) {
 			network_offset += VLAN_HLEN;
 			break;
 		}
@@ -385,7 +385,6 @@ static int batadv_interface_tx(struct sk_buff *skb,
  * batadv_interface_rx - receive ethernet frame on local batman-adv interface
  * @soft_iface: local interface which will receive the ethernet frame
  * @skb: ethernet frame for @soft_iface
- * @recv_if: interface on which the batman-adv packet was received
  * @hdr_size: size of already parsed batman-adv header
  * @orig_node: originator from which the batman-adv packet was sent
  *
@@ -400,12 +399,11 @@ static int batadv_interface_tx(struct sk_buff *skb,
  * isolated clients.
  */
 void batadv_interface_rx(struct net_device *soft_iface,
-			 struct sk_buff *skb, struct batadv_hard_iface *recv_if,
-			 int hdr_size, struct batadv_orig_node *orig_node)
+			 struct sk_buff *skb, int hdr_size,
+			 struct batadv_orig_node *orig_node)
 {
 	struct batadv_bcast_packet *batadv_bcast_packet;
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
-	__be16 ethertype = htons(ETH_P_BATMAN);
 	struct vlan_ethhdr *vhdr;
 	struct ethhdr *ethhdr;
 	unsigned short vid;
@@ -414,10 +412,6 @@ void batadv_interface_rx(struct net_device *soft_iface,
 	batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
 	is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST);
 
-	/* check if enough space is available for pulling, and pull */
-	if (!pskb_may_pull(skb, hdr_size))
-		goto dropped;
-
 	skb_pull_rcsum(skb, hdr_size);
 	skb_reset_mac_header(skb);
 
@@ -439,7 +433,8 @@ void batadv_interface_rx(struct net_device *soft_iface,
 
 		vhdr = (struct vlan_ethhdr *)skb->data;
 
-		if (vhdr->h_vlan_encapsulated_proto != ethertype)
+		/* drop batman-in-batman packets to prevent loops */
+		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
 			break;
 
 		/* fall through */
@@ -890,13 +885,14 @@ static int batadv_softif_slave_add(struct net_device *dev,
 				   struct net_device *slave_dev)
 {
 	struct batadv_hard_iface *hard_iface;
+	struct net *net = dev_net(dev);
 	int ret = -EINVAL;
 
 	hard_iface = batadv_hardif_get_by_netdev(slave_dev);
 	if (!hard_iface || hard_iface->soft_iface)
 		goto out;
 
-	ret = batadv_hardif_enable_interface(hard_iface, dev->name);
+	ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
 
 out:
 	if (hard_iface)
@@ -977,7 +973,7 @@ static void batadv_softif_init_early(struct net_device *dev)
 
 	dev->netdev_ops = &batadv_netdev_ops;
 	dev->destructor = batadv_softif_free;
-	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
+	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
 	dev->priv_flags |= IFF_NO_QUEUE;
 
 	/* can't call min_mtu, because the needed variables
@@ -993,7 +989,7 @@ static void batadv_softif_init_early(struct net_device *dev)
 	memset(priv, 0, sizeof(*priv));
 }
 
-struct net_device *batadv_softif_create(const char *name)
+struct net_device *batadv_softif_create(struct net *net, const char *name)
 {
 	struct net_device *soft_iface;
 	int ret;
@@ -1003,6 +999,8 @@ struct net_device *batadv_softif_create(const char *name)
 	if (!soft_iface)
 		return NULL;
 
+	dev_net_set(soft_iface, net);
+
 	soft_iface->rtnl_link_ops = &batadv_link_ops;
 
 	ret = register_netdevice(soft_iface);
@@ -1047,12 +1045,12 @@ static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
 	unregister_netdevice_queue(soft_iface, head);
 }
 
-int batadv_softif_is_valid(const struct net_device *net_dev)
+bool batadv_softif_is_valid(const struct net_device *net_dev)
 {
 	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
-		return 1;
+		return true;
 
-	return 0;
+	return false;
 }
 
 struct rtnl_link_ops batadv_link_ops __read_mostly = {

net/batman-adv/soft-interface.h

@@ -20,18 +20,20 @@
 
 #include "main.h"
 
+#include <linux/types.h>
 #include <net/rtnetlink.h>
 
 struct net_device;
+struct net;
 struct sk_buff;
 
 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len);
 void batadv_interface_rx(struct net_device *soft_iface,
-			 struct sk_buff *skb, struct batadv_hard_iface *recv_if,
-			 int hdr_size, struct batadv_orig_node *orig_node);
-struct net_device *batadv_softif_create(const char *name);
+			 struct sk_buff *skb, int hdr_size,
+			 struct batadv_orig_node *orig_node);
+struct net_device *batadv_softif_create(struct net *net, const char *name);
 void batadv_softif_destroy_sysfs(struct net_device *soft_iface);
-int batadv_softif_is_valid(const struct net_device *net_dev);
+bool batadv_softif_is_valid(const struct net_device *net_dev);
 extern struct rtnl_link_ops batadv_link_ops;
 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid);
 void batadv_softif_vlan_put(struct batadv_softif_vlan *softif_vlan);

net/batman-adv/sysfs.c

@@ -116,11 +116,13 @@ batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
 static char *batadv_uev_action_str[] = {
 	"add",
 	"del",
-	"change"
+	"change",
+	"loopdetect",
 };
 
 static char *batadv_uev_type_str[] = {
-	"gw"
+	"gw",
+	"bla",
 };
 
 /* Use this, if you have customized show and store functions for vlan attrs */
@@ -830,6 +832,7 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 				       size_t count)
 {
 	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
+	struct net *net = dev_net(net_dev);
 	struct batadv_hard_iface *hard_iface;
 	int status_tmp = -1;
 	int ret = count;
@@ -873,7 +876,7 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 		batadv_hardif_disable_interface(hard_iface,
 						BATADV_IF_CLEANUP_AUTO);
 
-	ret = batadv_hardif_enable_interface(hard_iface, buff);
+	ret = batadv_hardif_enable_interface(hard_iface, net, buff);
 
 unlock:
 	rtnl_unlock();

net/batman-adv/translation-table.c

@@ -43,7 +43,6 @@
 #include <linux/stddef.h>
 #include <linux/string.h>
 #include <linux/workqueue.h>
-#include <net/net_namespace.h>
 
 #include "bridge_loop_avoidance.h"
 #include "hard-interface.h"
@@ -76,9 +75,9 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  *
  * Compare the MAC address and the VLAN ID of the two TT entries and check if
  * they are the same TT client.
- * Return: 1 if the two TT clients are the same, 0 otherwise
+ * Return: true if the two TT clients are the same, false otherwise
  */
-static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
+static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
 {
 	const void *data1 = container_of(node, struct batadv_tt_common_entry,
 					 hash_entry);
@@ -585,6 +584,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	struct batadv_tt_local_entry *tt_local;
 	struct batadv_tt_global_entry *tt_global = NULL;
+	struct net *net = dev_net(soft_iface);
 	struct batadv_softif_vlan *vlan;
 	struct net_device *in_dev = NULL;
 	struct hlist_head *head;
@@ -596,7 +596,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
 	u32 match_mark;
 
 	if (ifindex != BATADV_NULL_IFINDEX)
-		in_dev = dev_get_by_index(&init_net, ifindex);
+		in_dev = dev_get_by_index(net, ifindex);
 
 	tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 
@@ -2361,19 +2361,19 @@ batadv_tt_req_node_new(struct batadv_priv *bat_priv,
  * @entry_ptr: to be checked local tt entry
  * @data_ptr: not used but definition required to satisfy the callback prototype
  *
- * Return: 1 if the entry is a valid, 0 otherwise.
+ * Return: true if the entry is a valid, false otherwise.
  */
-static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
+static bool batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
 {
 	const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
 
 	if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
-static int batadv_tt_global_valid(const void *entry_ptr,
-				  const void *data_ptr)
+static bool batadv_tt_global_valid(const void *entry_ptr,
+				   const void *data_ptr)
 {
 	const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
 	const struct batadv_tt_global_entry *tt_global_entry;
@@ -2381,7 +2381,7 @@ static int batadv_tt_global_valid(const void *entry_ptr,
 
 	if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
 	    tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
-		return 0;
+		return false;
 
 	tt_global_entry = container_of(tt_common_entry,
 				       struct batadv_tt_global_entry,
@@ -2403,7 +2403,8 @@ static int batadv_tt_global_valid(const void *entry_ptr,
 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
 				    struct batadv_hashtable *hash,
 				    void *tvlv_buff, u16 tt_len,
-				    int (*valid_cb)(const void *, const void *),
+				    bool (*valid_cb)(const void *,
+						     const void *),
 				    void *cb_data)
 {
 	struct batadv_tt_common_entry *tt_common_entry;
@@ -2552,11 +2553,11 @@ static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
  *
  * Return: true if the TT Request was sent, false otherwise
  */
-static int batadv_send_tt_request(struct batadv_priv *bat_priv,
-				  struct batadv_orig_node *dst_orig_node,
-				  u8 ttvn,
-				  struct batadv_tvlv_tt_vlan_data *tt_vlan,
-				  u16 num_vlan, bool full_table)
+static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
+				   struct batadv_orig_node *dst_orig_node,
+				   u8 ttvn,
+				   struct batadv_tvlv_tt_vlan_data *tt_vlan,
+				   u16 num_vlan, bool full_table)
 {
 	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
 	struct batadv_tt_req_node *tt_req_node = NULL;

net/batman-adv/types.h

@@ -657,6 +657,9 @@ struct batadv_priv_tt {
  * @num_requests: number of bla requests in flight
  * @claim_hash: hash table containing mesh nodes this host has claimed
  * @backbone_hash: hash table containing all detected backbone gateways
+ * @loopdetect_addr: MAC address used for own loopdetection frames
+ * @loopdetect_lasttime: time when the loopdetection frames were sent
+ * @loopdetect_next: how many periods to wait for the next loopdetect process
  * @bcast_duplist: recently received broadcast packets array (for broadcast
  *  duplicate suppression)
  * @bcast_duplist_curr: index of last broadcast packet added to bcast_duplist
@@ -668,6 +671,9 @@ struct batadv_priv_bla {
 	atomic_t num_requests;
 	struct batadv_hashtable *claim_hash;
 	struct batadv_hashtable *backbone_hash;
+	u8 loopdetect_addr[ETH_ALEN];
+	unsigned long loopdetect_lasttime;
+	atomic_t loopdetect_next;
 	struct batadv_bcast_duplist_entry bcast_duplist[BATADV_DUPLIST_SIZE];
 	int bcast_duplist_curr;
 	/* protects bcast_duplist & bcast_duplist_curr */
@@ -1012,6 +1018,7 @@ struct batadv_socket_packet {
  *  resolved
  * @crc: crc16 checksum over all claims
  * @crc_lock: lock protecting crc
+ * @report_work: work struct for reporting detected loops
  * @refcount: number of contexts the object is used
  * @rcu: struct used for freeing in an RCU-safe manner
  */
@@ -1025,6 +1032,7 @@ struct batadv_bla_backbone_gw {
 	atomic_t request_sent;
 	u16 crc;
 	spinlock_t crc_lock; /* protects crc */
+	struct work_struct report_work;
 	struct kref refcount;
 	struct rcu_head rcu;
 };