Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
 "Highlights (1721 non-merge commits, this has to be a record of some
  sort):

   1) Add 'random' mode to team driver, from Jiri Pirko and Eric
      Dumazet.

   2) Make it so that any driver that supports configuration of multiple
      MAC addresses can provide the forwarding database add and del
      calls by providing a default implementation and hooking that up if
      the driver doesn't have an explicit set of handlers.  From Vlad
      Yasevich.

   3) Support GSO segmentation over tunnels and other encapsulating
      devices such as VXLAN, from Pravin B Shelar.

   4) Support L2 GRE tunnels in the flow dissector, from Michael Dalton.

   5) Implement Tail Loss Probe (TLP) detection in TCP, from Nandita
      Dukkipati.

   6) In the PHY layer, allow supporting wake-on-lan in situations where
      the PHY registers have to be written for it to be configured.

      Use it to support wake-on-lan in mv643xx_eth.

      From Michael Stapelberg.

   7) Significantly improve firewire IPV6 support, from YOSHIFUJI
      Hideaki.

   8) Allow multiple packets to be sent in a single transmission using
      network coding in batman-adv, from Martin Hundebøll.

   9) Add support for T5 cxgb4 chips, from Santosh Rastapur.

  10) Generalize the VXLAN forwarding tables so that there is more
      flexibility in configurating various aspects of the endpoints.
      From David Stevens.

  11) Support RSS and TSO in hardware over GRE tunnels in bxn2x driver,
      from Dmitry Kravkov.

  12) Zero copy support in nfnelink_queue, from Eric Dumazet and Pablo
      Neira Ayuso.

  13) Start adding networking selftests.

  14) In situations of overload on the same AF_PACKET fanout socket, or
      per-cpu packet receive queue, minimize drop by distributing the
      load to other cpus/fanouts.  From Willem de Bruijn and Eric
      Dumazet.

  15) Add support for new payload offset BPF instruction, from Daniel
      Borkmann.

  16) Convert several drivers over to mdoule_platform_driver(), from
      Sachin Kamat.

  17) Provide a minimal BPF JIT image disassembler userspace tool, from
      Daniel Borkmann.

  18) Rewrite F-RTO implementation in TCP to match the final
      specification of it in RFC4138 and RFC5682.  From Yuchung Cheng.

  19) Provide netlink socket diag of netlink sockets ("Yo dawg, I hear
      you like netlink, so I implemented netlink dumping of netlink
      sockets.") From Andrey Vagin.

  20) Remove ugly passing of rtnetlink attributes into rtnl_doit
      functions, from Thomas Graf.

  21) Allow userspace to be able to see if a configuration change occurs
      in the middle of an address or device list dump, from Nicolas
      Dichtel.

  22) Support RFC3168 ECN protection for ipv6 fragments, from Hannes
      Frederic Sowa.

  23) Increase accuracy of packet length used by packet scheduler, from
      Jason Wang.

  24) Beginning set of changes to make ipv4/ipv6 fragment handling more
      scalable and less susceptible to overload and locking contention,
      from Jesper Dangaard Brouer.

  25) Get rid of using non-type-safe NLMSG_* macros and use nlmsg_*()
      instead.  From Hong Zhiguo.

  26) Optimize route usage in IPVS by avoiding reference counting where
      possible, from Julian Anastasov.

  27) Convert IPVS schedulers to RCU, also from Julian Anastasov.

  28) Support cpu fanouts in xt_NFQUEUE netfilter target, from Holger
      Eitzenberger.

  29) Network namespace support for nf_log, ebt_log, xt_LOG, ipt_ULOG,
      nfnetlink_log, and nfnetlink_queue.  From Gao feng.

  30) Implement RFC3168 ECN protection, from Hannes Frederic Sowa.

  31) Support several new r8169 chips, from Hayes Wang.

  32) Support tokenized interface identifiers in ipv6, from Daniel
      Borkmann.

  33) Use usbnet_link_change() helper in USB net driver, from Ming Lei.

  34) Add 802.1ad vlan offload support, from Patrick McHardy.

  35) Support mmap() based netlink communication, also from Patrick
      McHardy.

  36) Support HW timestamping in mlx4 driver, from Amir Vadai.

  37) Rationalize AF_PACKET packet timestamping when transmitting, from
      Willem de Bruijn and Daniel Borkmann.

  38) Bring parity to what's provided by /proc/net/packet socket dumping
      and the info provided by netlink socket dumping of AF_PACKET
      sockets.  From Nicolas Dichtel.

  39) Fix peeking beyond zero sized SKBs in AF_UNIX, from Benjamin
      Poirier"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1722 commits)
  filter: fix va_list build error
  af_unix: fix a fatal race with bit fields
  bnx2x: Prevent memory leak when cnic is absent
  bnx2x: correct reading of speed capabilities
  net: sctp: attribute printl with __printf for gcc fmt checks
  netlink: kconfig: move mmap i/o into netlink kconfig
  netpoll: convert mutex into a semaphore
  netlink: Fix skb ref counting.
  net_sched: act_ipt forward compat with xtables
  mlx4_en: fix a build error on 32bit arches
  Revert "bnx2x: allow nvram test to run when device is down"
  bridge: avoid OOPS if root port not found
  drivers: net: cpsw: fix kernel warn on cpsw irq enable
  sh_eth: use random MAC address if no valid one supplied
  3c509.c: call SET_NETDEV_DEV for all device types (ISA/ISAPnP/EISA)
  tg3: fix to append hardware time stamping flags
  unix/stream: fix peeking with an offset larger than data in queue
  unix/dgram: fix peeking with an offset larger than data in queue
  unix/dgram: peek beyond 0-sized skbs
  openvswitch: Remove unneeded ovs_netdev_get_ifindex()
  ...

24 files changed, 2533 insertions, 185 deletions

diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig
index 8d8afb1..fa780b7 100644
--- a/net/batman-adv/Kconfig
+++ b/net/batman-adv/Kconfig
@@ -36,6 +36,20 @@ config BATMAN_ADV_DAT
 	  mesh networks. If you think that your network does not need
 	  this option you can safely remove it and save some space.
 
+config BATMAN_ADV_NC
+	bool "Network Coding"
+	depends on BATMAN_ADV
+	default n
+	help
+	  This option enables network coding, a mechanism that aims to
+	  increase the overall network throughput by fusing multiple
+	  packets in one transmission.
+	  Note that interfaces controlled by batman-adv must be manually
+	  configured to have promiscuous mode enabled in order to make
+	  network coding work.
+	  If you think that your network does not need this feature you
+	  can safely disable it and save some space.
+
 config BATMAN_ADV_DEBUG
 	bool "B.A.T.M.A.N. debugging"
 	depends on BATMAN_ADV
diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index e45e3b4..acbac2a 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
+# Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
 #
 # Marek Lindner, Simon Wunderlich
 #
@@ -30,6 +30,7 @@ batman-adv-y += hard-interface.o
 batman-adv-y += hash.o
 batman-adv-y += icmp_socket.o
 batman-adv-y += main.o
+batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o
 batman-adv-y += originator.o
 batman-adv-y += ring_buffer.o
 batman-adv-y += routing.o
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index a5bb0a76..071f288 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -27,6 +27,7 @@
 #include "hard-interface.h"
 #include "send.h"
 #include "bat_algo.h"
+#include "network-coding.h"
 
 static struct batadv_neigh_node *
 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
@@ -1185,6 +1186,10 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
 	if (!orig_neigh_node)
 		goto out;
 
+	/* Update nc_nodes of the originator */
+	batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
+				 batadv_ogm_packet, is_single_hop_neigh);
+
 	orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
 
 	/* drop packet if sender is not a direct neighbor and if we
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 6a4f728..379061c 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -341,7 +341,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
 	}
 
 	if (vid != -1)
-		skb = vlan_insert_tag(skb, vid);
+		skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), vid);
 
 	skb_reset_mac_header(skb);
 	skb->protocol = eth_type_trans(skb, soft_iface);
diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c
index 6ae8651..f186a55 100644
--- a/net/batman-adv/debugfs.c
+++ b/net/batman-adv/debugfs.c
@@ -32,6 +32,7 @@
 #include "icmp_socket.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
+#include "network-coding.h"
 
 static struct dentry *batadv_debugfs;
 
@@ -310,6 +311,14 @@ struct batadv_debuginfo {
 	const struct file_operations fops;
 };
 
+#ifdef CONFIG_BATMAN_ADV_NC
+static int batadv_nc_nodes_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, batadv_nc_nodes_seq_print_text, net_dev);
+}
+#endif
+
 #define BATADV_DEBUGINFO(_name, _mode, _open)		\
 struct batadv_debuginfo batadv_debuginfo_##_name = {	\
 	.attr = { .name = __stringify(_name),		\
@@ -348,6 +357,9 @@ static BATADV_DEBUGINFO(dat_cache, S_IRUGO, batadv_dat_cache_open);
 static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 			batadv_transtable_local_open);
 static BATADV_DEBUGINFO(vis_data, S_IRUGO, batadv_vis_data_open);
+#ifdef CONFIG_BATMAN_ADV_NC
+static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
+#endif
 
 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 	&batadv_debuginfo_originators,
@@ -362,6 +374,9 @@ static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
 #endif
 	&batadv_debuginfo_transtable_local,
 	&batadv_debuginfo_vis_data,
+#ifdef CONFIG_BATMAN_ADV_NC
+	&batadv_debuginfo_nc_nodes,
+#endif
 	NULL,
 };
 
@@ -431,6 +446,9 @@ int batadv_debugfs_add_meshif(struct net_device *dev)
 		}
 	}
 
+	if (batadv_nc_init_debugfs(bat_priv) < 0)
+		goto rem_attr;
+
 	return 0;
 rem_attr:
 	debugfs_remove_recursive(bat_priv->debug_dir);
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index d54188a..8e15d96 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -816,7 +816,6 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
 	bool ret = false;
 	struct batadv_dat_entry *dat_entry = NULL;
 	struct sk_buff *skb_new;
-	struct batadv_hard_iface *primary_if = NULL;
 
 	if (!atomic_read(&bat_priv->distributed_arp_table))
 		goto out;
@@ -838,22 +837,18 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
 
 	dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst);
 	if (dat_entry) {
-		primary_if = batadv_primary_if_get_selected(bat_priv);
-		if (!primary_if)
-			goto out;
-
 		skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src,
-				     primary_if->soft_iface, ip_dst, hw_src,
+				     bat_priv->soft_iface, ip_dst, hw_src,
 				     dat_entry->mac_addr, hw_src);
 		if (!skb_new)
 			goto out;
 
 		skb_reset_mac_header(skb_new);
 		skb_new->protocol = eth_type_trans(skb_new,
-						   primary_if->soft_iface);
+						   bat_priv->soft_iface);
 		bat_priv->stats.rx_packets++;
 		bat_priv->stats.rx_bytes += skb->len + ETH_HLEN;
-		primary_if->soft_iface->last_rx = jiffies;
+		bat_priv->soft_iface->last_rx = jiffies;
 
 		netif_rx(skb_new);
 		batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n");
@@ -866,8 +861,6 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
 out:
 	if (dat_entry)
 		batadv_dat_entry_free_ref(dat_entry);
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
 	return ret;
 }
 
@@ -887,7 +880,6 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 	__be32 ip_src, ip_dst;
 	uint8_t *hw_src;
 	struct sk_buff *skb_new;
-	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_dat_entry *dat_entry = NULL;
 	bool ret = false;
 	int err;
@@ -912,12 +904,8 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 	if (!dat_entry)
 		goto out;
 
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto out;
-
 	skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src,
-			     primary_if->soft_iface, ip_dst, hw_src,
+			     bat_priv->soft_iface, ip_dst, hw_src,
 			     dat_entry->mac_addr, hw_src);
 
 	if (!skb_new)
@@ -941,8 +929,6 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 out:
 	if (dat_entry)
 		batadv_dat_entry_free_ref(dat_entry);
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
 	if (ret)
 		kfree_skb(skb);
 	return ret;
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 34f99a4..f105219 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -500,7 +500,7 @@ int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
 	rcu_read_unlock();
 
 	if (gw_count == 0)
-		seq_printf(seq, "No gateways in range ...\n");
+		seq_puts(seq, "No gateways in range ...\n");
 
 out:
 	if (primary_if)
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 368219e..522243a 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -307,11 +307,35 @@ batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
 	batadv_update_min_mtu(hard_iface->soft_iface);
 }
 
+/**
+ * batadv_master_del_slave - remove hard_iface from the current master interface
+ * @slave: the interface enslaved in another master
+ * @master: the master from which slave has to be removed
+ *
+ * Invoke ndo_del_slave on master passing slave as argument. In this way slave
+ * is free'd and master can correctly change its internal state.
+ * Return 0 on success, a negative value representing the error otherwise
+ */
+static int batadv_master_del_slave(struct batadv_hard_iface *slave,
+				   struct net_device *master)
+{
+	int ret;
+
+	if (!master)
+		return 0;
+
+	ret = -EBUSY;
+	if (master->netdev_ops->ndo_del_slave)
+		ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
+
+	return ret;
+}
+
 int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 				   const char *iface_name)
 {
 	struct batadv_priv *bat_priv;
-	struct net_device *soft_iface;
+	struct net_device *soft_iface, *master;
 	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
 	int ret;
 
@@ -321,11 +345,6 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	if (!atomic_inc_not_zero(&hard_iface->refcount))
 		goto out;
 
-	/* hard-interface is part of a bridge */
-	if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
-		pr_err("You are about to enable batman-adv on '%s' which already is part of a bridge. Unless you know exactly what you are doing this is probably wrong and won't work the way you think it would.\n",
-		       hard_iface->net_dev->name);
-
 	soft_iface = dev_get_by_name(&init_net, iface_name);
 
 	if (!soft_iface) {
@@ -347,12 +366,24 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 		goto err_dev;
 	}
 
+	/* check if the interface is enslaved in another virtual one and
+	 * in that case unlink it first
+	 */
+	master = netdev_master_upper_dev_get(hard_iface->net_dev);
+	ret = batadv_master_del_slave(hard_iface, master);
+	if (ret)
+		goto err_dev;
+
 	hard_iface->soft_iface = soft_iface;
 	bat_priv = netdev_priv(hard_iface->soft_iface);
 
+	ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface);
+	if (ret)
+		goto err_dev;
+
 	ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
 	if (ret < 0)
-		goto err_dev;
+		goto err_upper;
 
 	hard_iface->if_num = bat_priv->num_ifaces;
 	bat_priv->num_ifaces++;
@@ -362,7 +393,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 		bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
 		bat_priv->num_ifaces--;
 		hard_iface->if_status = BATADV_IF_NOT_IN_USE;
-		goto err_dev;
+		goto err_upper;
 	}
 
 	hard_iface->batman_adv_ptype.type = ethertype;
@@ -401,14 +432,18 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 out:
 	return 0;
 
+err_upper:
+	netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface);
 err_dev:
+	hard_iface->soft_iface = NULL;
 	dev_put(soft_iface);
 err:
 	batadv_hardif_free_ref(hard_iface);
 	return ret;
 }
 
-void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
+void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
+				     enum batadv_hard_if_cleanup autodel)
 {
 	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 	struct batadv_hard_iface *primary_if = NULL;
@@ -446,9 +481,10 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
 	dev_put(hard_iface->soft_iface);
 
 	/* nobody uses this interface anymore */
-	if (!bat_priv->num_ifaces)
-		batadv_softif_destroy(hard_iface->soft_iface);
+	if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO)
+		batadv_softif_destroy_sysfs(hard_iface->soft_iface);
 
+	netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
 	hard_iface->soft_iface = NULL;
 	batadv_hardif_free_ref(hard_iface);
 
@@ -533,7 +569,8 @@ static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
 
 	/* first deactivate interface */
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
-		batadv_hardif_disable_interface(hard_iface);
+		batadv_hardif_disable_interface(hard_iface,
+						BATADV_IF_CLEANUP_AUTO);
 
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 		return;
@@ -563,6 +600,11 @@ static int batadv_hard_if_event(struct notifier_block *this,
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_priv *bat_priv;
 
+	if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
+		batadv_sysfs_add_meshif(net_dev);
+		return NOTIFY_DONE;
+	}
+
 	hard_iface = batadv_hardif_get_by_netdev(net_dev);
 	if (!hard_iface && event == NETDEV_REGISTER)
 		hard_iface = batadv_hardif_add_interface(net_dev);
diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h
index 308437d..4989288 100644
--- a/net/batman-adv/hard-interface.h
+++ b/net/batman-adv/hard-interface.h
@@ -29,13 +29,24 @@ enum batadv_hard_if_state {
 	BATADV_IF_I_WANT_YOU,
 };
 
+/**
+ * enum batadv_hard_if_cleanup - Cleanup modi for soft_iface after slave removal
+ * @BATADV_IF_CLEANUP_KEEP: Don't automatically delete soft-interface
+ * @BATADV_IF_CLEANUP_AUTO: Delete soft-interface after last slave was removed
+ */
+enum batadv_hard_if_cleanup {
+	BATADV_IF_CLEANUP_KEEP,
+	BATADV_IF_CLEANUP_AUTO,
+};
+
 extern struct notifier_block batadv_hard_if_notifier;
 
 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);
-void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface);
+void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
+				     enum batadv_hard_if_cleanup autodel);
 void batadv_hardif_remove_interfaces(void);
 int batadv_hardif_min_mtu(struct net_device *soft_iface);
 void batadv_update_min_mtu(struct net_device *soft_iface);
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index fa563e4..3e30a0f 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -35,6 +35,7 @@
 #include "vis.h"
 #include "hash.h"
 #include "bat_algo.h"
+#include "network-coding.h"
 
 
 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
@@ -70,6 +71,7 @@ static int __init batadv_init(void)
 	batadv_debugfs_init();
 
 	register_netdevice_notifier(&batadv_hard_if_notifier);
+	rtnl_link_register(&batadv_link_ops);
 
 	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
 		BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
@@ -80,6 +82,7 @@ static int __init batadv_init(void)
 static void __exit batadv_exit(void)
 {
 	batadv_debugfs_destroy();
+	rtnl_link_unregister(&batadv_link_ops);
 	unregister_netdevice_notifier(&batadv_hard_if_notifier);
 	batadv_hardif_remove_interfaces();
 
@@ -135,6 +138,10 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	if (ret < 0)
 		goto err;
 
+	ret = batadv_nc_init(bat_priv);
+	if (ret < 0)
+		goto err;
+
 	atomic_set(&bat_priv->gw.reselect, 0);
 	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
 
@@ -157,6 +164,7 @@ void batadv_mesh_free(struct net_device *soft_iface)
 
 	batadv_gw_node_purge(bat_priv);
 	batadv_originator_free(bat_priv);
+	batadv_nc_free(bat_priv);
 
 	batadv_tt_free(bat_priv);
 
@@ -169,6 +177,12 @@ void batadv_mesh_free(struct net_device *soft_iface)
 	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
 }
 
+/**
+ * batadv_is_my_mac - check if the given mac address belongs to any of the real
+ * interfaces in the current mesh
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the address to check
+ */
 int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr)
 {
 	const struct batadv_hard_iface *hard_iface;
@@ -414,7 +428,7 @@ int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
 {
 	struct batadv_algo_ops *bat_algo_ops;
 
-	seq_printf(seq, "Available routing algorithms:\n");
+	seq_puts(seq, "Available routing algorithms:\n");
 
 	hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
 		seq_printf(seq, "%s\n", bat_algo_ops->name);
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index d40910d..59a0d6a 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -26,7 +26,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2013.1.0"
+#define BATADV_SOURCE_VERSION "2013.2.0"
 #endif
 
 /* B.A.T.M.A.N. parameters */
@@ -105,6 +105,8 @@
 #define BATADV_RESET_PROTECTION_MS 30000
 #define BATADV_EXPECTED_SEQNO_RANGE	65536
 
+#define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
+
 enum batadv_mesh_state {
 	BATADV_MESH_INACTIVE,
 	BATADV_MESH_ACTIVE,
@@ -150,6 +152,7 @@ enum batadv_uev_type {
 #include <linux/percpu.h>
 #include <linux/slab.h>
 #include <net/sock.h>		/* struct sock */
+#include <net/rtnetlink.h>
 #include <linux/jiffies.h>
 #include <linux/seq_file.h>
 #include "types.h"
@@ -185,6 +188,7 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
  * @BATADV_DBG_TT: translation table messages
  * @BATADV_DBG_BLA: bridge loop avoidance messages
  * @BATADV_DBG_DAT: ARP snooping and DAT related messages
+ * @BATADV_DBG_NC: network coding related messages
  * @BATADV_DBG_ALL: the union of all the above log levels
  */
 enum batadv_dbg_level {
@@ -193,7 +197,8 @@ enum batadv_dbg_level {
 	BATADV_DBG_TT	  = BIT(2),
 	BATADV_DBG_BLA    = BIT(3),
 	BATADV_DBG_DAT    = BIT(4),
-	BATADV_DBG_ALL    = 31,
+	BATADV_DBG_NC	  = BIT(5),
+	BATADV_DBG_ALL    = 63,
 };
 
 #ifdef CONFIG_BATMAN_ADV_DEBUG
@@ -298,4 +303,10 @@ static inline uint64_t batadv_sum_counter(struct batadv_priv *bat_priv,
 	return sum;
 }
 
+/* Define a macro to reach the control buffer of the skb. The members of the
+ * control buffer are defined in struct batadv_skb_cb in types.h.
+ * The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h.
+ */
+#define BATADV_SKB_CB(__skb)       ((struct batadv_skb_cb *)&((__skb)->cb[0]))
+
 #endif /* _NET_BATMAN_ADV_MAIN_H_ */
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
new file mode 100644
index 0000000..f7c5430
--- /dev/null
+++ b/net/batman-adv/network-coding.c
@@ -0,0 +1,1822 @@
+/* Copyright (C) 2012-2013 B.A.T.M.A.N. contributors:
+ *
+ * Martin Hundebøll, Jeppe Ledet-Pedersen
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/debugfs.h>
+
+#include "main.h"
+#include "hash.h"
+#include "network-coding.h"
+#include "send.h"
+#include "originator.h"
+#include "hard-interface.h"
+#include "routing.h"
+
+static struct lock_class_key batadv_nc_coding_hash_lock_class_key;
+static struct lock_class_key batadv_nc_decoding_hash_lock_class_key;
+
+static void batadv_nc_worker(struct work_struct *work);
+static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
+				       struct batadv_hard_iface *recv_if);
+
+/**
+ * batadv_nc_start_timer - initialise the nc periodic worker
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+static void batadv_nc_start_timer(struct batadv_priv *bat_priv)
+{
+	queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work,
+			   msecs_to_jiffies(10));
+}
+
+/**
+ * batadv_nc_init - initialise coding hash table and start house keeping
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+int batadv_nc_init(struct batadv_priv *bat_priv)
+{
+	bat_priv->nc.timestamp_fwd_flush = jiffies;
+	bat_priv->nc.timestamp_sniffed_purge = jiffies;
+
+	if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash)
+		return 0;
+
+	bat_priv->nc.coding_hash = batadv_hash_new(128);
+	if (!bat_priv->nc.coding_hash)
+		goto err;
+
+	batadv_hash_set_lock_class(bat_priv->nc.coding_hash,
+				   &batadv_nc_coding_hash_lock_class_key);
+
+	bat_priv->nc.decoding_hash = batadv_hash_new(128);
+	if (!bat_priv->nc.decoding_hash)
+		goto err;
+
+	batadv_hash_set_lock_class(bat_priv->nc.coding_hash,
+				   &batadv_nc_decoding_hash_lock_class_key);
+
+	/* Register our packet type */
+	if (batadv_recv_handler_register(BATADV_CODED,
+					 batadv_nc_recv_coded_packet) < 0)
+		goto err;
+
+	INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker);
+	batadv_nc_start_timer(bat_priv);
+
+	return 0;
+
+err:
+	return -ENOMEM;
+}
+
+/**
+ * batadv_nc_init_bat_priv - initialise the nc specific bat_priv variables
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv)
+{
+	atomic_set(&bat_priv->network_coding, 1);
+	bat_priv->nc.min_tq = 200;
+	bat_priv->nc.max_fwd_delay = 10;
+	bat_priv->nc.max_buffer_time = 200;
+}
+
+/**
+ * batadv_nc_init_orig - initialise the nc fields of an orig_node
+ * @orig_node: the orig_node which is going to be initialised
+ */
+void batadv_nc_init_orig(struct batadv_orig_node *orig_node)
+{
+	INIT_LIST_HEAD(&orig_node->in_coding_list);
+	INIT_LIST_HEAD(&orig_node->out_coding_list);
+	spin_lock_init(&orig_node->in_coding_list_lock);
+	spin_lock_init(&orig_node->out_coding_list_lock);
+}
+
+/**
+ * batadv_nc_node_free_rcu - rcu callback to free an nc node and remove
+ *  its refcount on the orig_node
+ * @rcu: rcu pointer of the nc node
+ */
+static void batadv_nc_node_free_rcu(struct rcu_head *rcu)
+{
+	struct batadv_nc_node *nc_node;
+
+	nc_node = container_of(rcu, struct batadv_nc_node, rcu);
+	batadv_orig_node_free_ref(nc_node->orig_node);
+	kfree(nc_node);
+}
+
+/**
+ * batadv_nc_node_free_ref - decrements the nc node refcounter and possibly
+ * frees it
+ * @nc_node: the nc node to free
+ */
+static void batadv_nc_node_free_ref(struct batadv_nc_node *nc_node)
+{
+	if (atomic_dec_and_test(&nc_node->refcount))
+		call_rcu(&nc_node->rcu, batadv_nc_node_free_rcu);
+}
+
+/**
+ * batadv_nc_path_free_ref - decrements the nc path refcounter and possibly
+ * frees it
+ * @nc_path: the nc node to free
+ */
+static void batadv_nc_path_free_ref(struct batadv_nc_path *nc_path)
+{
+	if (atomic_dec_and_test(&nc_path->refcount))
+		kfree_rcu(nc_path, rcu);
+}
+
+/**
+ * batadv_nc_packet_free - frees nc packet
+ * @nc_packet: the nc packet to free
+ */
+static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet)
+{
+	if (nc_packet->skb)
+		kfree_skb(nc_packet->skb);
+
+	batadv_nc_path_free_ref(nc_packet->nc_path);
+	kfree(nc_packet);
+}
+
+/**
+ * batadv_nc_to_purge_nc_node - checks whether an nc node has to be purged
+ * @bat_priv: the bat priv with all the soft interface information
+ * @nc_node: the nc node to check
+ *
+ * Returns true if the entry has to be purged now, false otherwise
+ */
+static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv,
+				       struct batadv_nc_node *nc_node)
+{
+	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+		return true;
+
+	return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT);
+}
+
+/**
+ * batadv_nc_to_purge_nc_path_coding - checks whether an nc path has timed out
+ * @bat_priv: the bat priv with all the soft interface information
+ * @nc_path: the nc path to check
+ *
+ * Returns true if the entry has to be purged now, false otherwise
+ */
+static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv,
+					      struct batadv_nc_path *nc_path)
+{
+	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+		return true;
+
+	/* purge the path when no packets has been added for 10 times the
+	 * max_fwd_delay time
+	 */
+	return batadv_has_timed_out(nc_path->last_valid,
+				    bat_priv->nc.max_fwd_delay * 10);
+}
+
+/**
+ * batadv_nc_to_purge_nc_path_decoding - checks whether an nc path has timed out
+ * @bat_priv: the bat priv with all the soft interface information
+ * @nc_path: the nc path to check
+ *
+ * Returns true if the entry has to be purged now, false otherwise
+ */
+static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv,
+						struct batadv_nc_path *nc_path)
+{
+	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+		return true;
+
+	/* purge the path when no packets has been added for 10 times the
+	 * max_buffer time
+	 */
+	return batadv_has_timed_out(nc_path->last_valid,
+				    bat_priv->nc.max_buffer_time*10);
+}
+
+/**
+ * batadv_nc_purge_orig_nc_nodes - go through list of nc nodes and purge stale
+ *  entries
+ * @bat_priv: the bat priv with all the soft interface information
+ * @list: list of nc nodes
+ * @lock: nc node list lock
+ * @to_purge: function in charge to decide whether an entry has to be purged or
+ *	      not. This function takes the nc node as argument and has to return
+ *	      a boolean value: true if the entry has to be deleted, false
+ *	      otherwise
+ */
+static void
+batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv,
+			      struct list_head *list,
+			      spinlock_t *lock,
+			      bool (*to_purge)(struct batadv_priv *,
+					       struct batadv_nc_node *))
+{
+	struct batadv_nc_node *nc_node, *nc_node_tmp;
+
+	/* For each nc_node in list */
+	spin_lock_bh(lock);
+	list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) {
+		/* if an helper function has been passed as parameter,
+		 * ask it if the entry has to be purged or not
+		 */
+		if (to_purge && !to_purge(bat_priv, nc_node))
+			continue;
+
+		batadv_dbg(BATADV_DBG_NC, bat_priv,
+			   "Removing nc_node %pM -> %pM\n",
+			   nc_node->addr, nc_node->orig_node->orig);
+		list_del_rcu(&nc_node->list);
+		batadv_nc_node_free_ref(nc_node);
+	}
+	spin_unlock_bh(lock);
+}
+
+/**
+ * batadv_nc_purge_orig - purges all nc node data attached of the given
+ *  originator
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: orig_node with the nc node entries to be purged
+ * @to_purge: function in charge to decide whether an entry has to be purged or
+ *	      not. This function takes the nc node as argument and has to return
+ *	      a boolean value: true is the entry has to be deleted, false
+ *	      otherwise
+ */
+void batadv_nc_purge_orig(struct batadv_priv *bat_priv,
+			  struct batadv_orig_node *orig_node,
+			  bool (*to_purge)(struct batadv_priv *,
+					   struct batadv_nc_node *))
+{
+	/* Check ingoing nc_node's of this orig_node */
+	batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list,
+				      &orig_node->in_coding_list_lock,
+				      to_purge);
+
+	/* Check outgoing nc_node's of this orig_node */
+	batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list,
+				      &orig_node->out_coding_list_lock,
+				      to_purge);
+}
+
+/**
+ * batadv_nc_purge_orig_hash - traverse entire originator hash to check if they
+ *  have timed out nc nodes
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv)
+{
+	struct batadv_hashtable *hash = bat_priv->orig_hash;
+	struct hlist_head *head;
+	struct batadv_orig_node *orig_node;
+	uint32_t i;
+
+	if (!hash)
+		return;
+
+	/* For each orig_node */
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(orig_node, head, hash_entry)
+			batadv_nc_purge_orig(bat_priv, orig_node,
+					     batadv_nc_to_purge_nc_node);
+		rcu_read_unlock();
+	}
+}
+
+/**
+ * batadv_nc_purge_paths - traverse all nc paths part of the hash and remove
+ *  unused ones
+ * @bat_priv: the bat priv with all the soft interface information
+ * @hash: hash table containing the nc paths to check
+ * @to_purge: function in charge to decide whether an entry has to be purged or
+ *	      not. This function takes the nc node as argument and has to return
+ *	      a boolean value: true is the entry has to be deleted, false
+ *	      otherwise
+ */
+static void batadv_nc_purge_paths(struct batadv_priv *bat_priv,
+				  struct batadv_hashtable *hash,
+				  bool (*to_purge)(struct batadv_priv *,
+						   struct batadv_nc_path *))
+{
+	struct hlist_head *head;
+	struct hlist_node *node_tmp;
+	struct batadv_nc_path *nc_path;
+	spinlock_t *lock; /* Protects lists in hash */
+	uint32_t i;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+		lock = &hash->list_locks[i];
+
+		/* For each nc_path in this bin */
+		spin_lock_bh(lock);
+		hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) {
+			/* if an helper function has been passed as parameter,
+			 * ask it if the entry has to be purged or not
+			 */
+			if (to_purge && !to_purge(bat_priv, nc_path))
+				continue;
+
+			/* purging an non-empty nc_path should never happen, but
+			 * is observed under high CPU load. Delay the purging
+			 * until next iteration to allow the packet_list to be
+			 * emptied first.
+			 */
+			if (!unlikely(list_empty(&nc_path->packet_list))) {
+				net_ratelimited_function(printk,
+							 KERN_WARNING
+							 "Skipping free of non-empty nc_path (%pM -> %pM)!\n",
+							 nc_path->prev_hop,
+							 nc_path->next_hop);
+				continue;
+			}
+
+			/* nc_path is unused, so remove it */
+			batadv_dbg(BATADV_DBG_NC, bat_priv,
+				   "Remove nc_path %pM -> %pM\n",
+				   nc_path->prev_hop, nc_path->next_hop);
+			hlist_del_rcu(&nc_path->hash_entry);
+			batadv_nc_path_free_ref(nc_path);
+		}
+		spin_unlock_bh(lock);
+	}
+}
+
+/**
+ * batadv_nc_hash_key_gen - computes the nc_path hash key
+ * @key: buffer to hold the final hash key
+ * @src: source ethernet mac address going into the hash key
+ * @dst: destination ethernet mac address going into the hash key
+ */
+static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src,
+				   const char *dst)
+{
+	memcpy(key->prev_hop, src, sizeof(key->prev_hop));
+	memcpy(key->next_hop, dst, sizeof(key->next_hop));
+}
+
+/**
+ * batadv_nc_hash_choose - compute the hash value for an nc path
+ * @data: data to hash
+ * @size: size of the hash table
+ *
+ * Returns the selected index in the hash table for the given data.
+ */
+static uint32_t batadv_nc_hash_choose(const void *data, uint32_t size)
+{
+	const struct batadv_nc_path *nc_path = data;
+	uint32_t hash = 0;
+
+	hash = batadv_hash_bytes(hash, &nc_path->prev_hop,
+				 sizeof(nc_path->prev_hop));
+	hash = batadv_hash_bytes(hash, &nc_path->next_hop,
+				 sizeof(nc_path->next_hop));
+
+	hash += (hash << 3);
+	hash ^= (hash >> 11);
+	hash += (hash << 15);
+
+	return hash % size;
+}
+
+/**
+ * batadv_nc_hash_compare - comparing function used in the network coding hash
+ *  tables
+ * @node: node in the local table
+ * @data2: second object to compare the node to
+ *
+ * Returns 1 if the two entry are the same, 0 otherwise
+ */
+static int batadv_nc_hash_compare(const struct hlist_node *node,
+				  const void *data2)
+{
+	const struct batadv_nc_path *nc_path1, *nc_path2;
+
+	nc_path1 = container_of(node, struct batadv_nc_path, hash_entry);
+	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 (memcmp(nc_path1->next_hop, nc_path2->next_hop,
+		   sizeof(nc_path1->next_hop)) != 0)
+		return 0;
+
+	return 1;
+}
+
+/**
+ * batadv_nc_hash_find - search for an existing nc path and return it
+ * @hash: hash table containing the nc path
+ * @data: search key
+ *
+ * Returns the nc_path if found, NULL otherwise.
+ */
+static struct batadv_nc_path *
+batadv_nc_hash_find(struct batadv_hashtable *hash,
+		    void *data)
+{
+	struct hlist_head *head;
+	struct batadv_nc_path *nc_path, *nc_path_tmp = NULL;
+	int index;
+
+	if (!hash)
+		return NULL;
+
+	index = batadv_nc_hash_choose(data, hash->size);
+	head = &hash->table[index];
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(nc_path, head, hash_entry) {
+		if (!batadv_nc_hash_compare(&nc_path->hash_entry, data))
+			continue;
+
+		if (!atomic_inc_not_zero(&nc_path->refcount))
+			continue;
+
+		nc_path_tmp = nc_path;
+		break;
+	}
+	rcu_read_unlock();
+
+	return nc_path_tmp;
+}
+
+/**
+ * batadv_nc_send_packet - send non-coded packet and free nc_packet struct
+ * @nc_packet: the nc packet to send
+ */
+static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet)
+{
+	batadv_send_skb_packet(nc_packet->skb,
+			       nc_packet->neigh_node->if_incoming,
+			       nc_packet->nc_path->next_hop);
+	nc_packet->skb = NULL;
+	batadv_nc_packet_free(nc_packet);
+}
+
+/**
+ * batadv_nc_sniffed_purge - Checks timestamp of given sniffed nc_packet.
+ * @bat_priv: the bat priv with all the soft interface information
+ * @nc_path: the nc path the packet belongs to
+ * @nc_packet: the nc packet to be checked
+ *
+ * Checks whether the given sniffed (overheard) nc_packet has hit its buffering
+ * timeout. If so, the packet is no longer kept and the entry deleted from the
+ * queue. Has to be called with the appropriate locks.
+ *
+ * Returns false as soon as the entry in the fifo queue has not been timed out
+ * yet and true otherwise.
+ */
+static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv,
+				    struct batadv_nc_path *nc_path,
+				    struct batadv_nc_packet *nc_packet)
+{
+	unsigned long timeout = bat_priv->nc.max_buffer_time;
+	bool res = false;
+
+	/* Packets are added to tail, so the remaining packets did not time
+	 * out and we can stop processing the current queue
+	 */
+	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE &&
+	    !batadv_has_timed_out(nc_packet->timestamp, timeout))
+		goto out;
+
+	/* purge nc packet */
+	list_del(&nc_packet->list);
+	batadv_nc_packet_free(nc_packet);
+
+	res = true;
+
+out:
+	return res;
+}
+
+/**
+ * batadv_nc_fwd_flush - Checks the timestamp of the given nc packet.
+ * @bat_priv: the bat priv with all the soft interface information
+ * @nc_path: the nc path the packet belongs to
+ * @nc_packet: the nc packet to be checked
+ *
+ * Checks whether the given nc packet has hit its forward timeout. If so, the
+ * packet is no longer delayed, immediately sent and the entry deleted from the
+ * queue. Has to be called with the appropriate locks.
+ *
+ * Returns false as soon as the entry in the fifo queue has not been timed out
+ * yet and true otherwise.
+ */
+static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv,
+				struct batadv_nc_path *nc_path,
+				struct batadv_nc_packet *nc_packet)
+{
+	unsigned long timeout = bat_priv->nc.max_fwd_delay;
+
+	/* Packets are added to tail, so the remaining packets did not time
+	 * out and we can stop processing the current queue
+	 */
+	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE &&
+	    !batadv_has_timed_out(nc_packet->timestamp, timeout))
+		return false;
+
+	/* Send packet */
+	batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
+	batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
+			   nc_packet->skb->len + ETH_HLEN);
+	list_del(&nc_packet->list);
+	batadv_nc_send_packet(nc_packet);
+
+	return true;
+}
+
+/**
+ * batadv_nc_process_nc_paths - traverse given nc packet pool and free timed out
+ *  nc packets
+ * @bat_priv: the bat priv with all the soft interface information
+ * @hash: to be processed hash table
+ * @process_fn: Function called to process given nc packet. Should return true
+ *	        to encourage this function to proceed with the next packet.
+ *	        Otherwise the rest of the current queue is skipped.
+ */
+static void
+batadv_nc_process_nc_paths(struct batadv_priv *bat_priv,
+			   struct batadv_hashtable *hash,
+			   bool (*process_fn)(struct batadv_priv *,
+					      struct batadv_nc_path *,
+					      struct batadv_nc_packet *))
+{
+	struct hlist_head *head;
+	struct batadv_nc_packet *nc_packet, *nc_packet_tmp;
+	struct batadv_nc_path *nc_path;
+	bool ret;
+	int i;
+
+	if (!hash)
+		return;
+
+	/* Loop hash table bins */
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		/* Loop coding paths */
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(nc_path, head, hash_entry) {
+			/* Loop packets */
+			spin_lock_bh(&nc_path->packet_list_lock);
+			list_for_each_entry_safe(nc_packet, nc_packet_tmp,
+						 &nc_path->packet_list, list) {
+				ret = process_fn(bat_priv, nc_path, nc_packet);
+				if (!ret)
+					break;
+			}
+			spin_unlock_bh(&nc_path->packet_list_lock);
+		}
+		rcu_read_unlock();
+	}
+}
+
+/**
+ * batadv_nc_worker - periodic task for house keeping related to network coding
+ * @work: kernel work struct
+ */
+static void batadv_nc_worker(struct work_struct *work)
+{
+	struct delayed_work *delayed_work;
+	struct batadv_priv_nc *priv_nc;
+	struct batadv_priv *bat_priv;
+	unsigned long timeout;
+
+	delayed_work = container_of(work, struct delayed_work, work);
+	priv_nc = container_of(delayed_work, struct batadv_priv_nc, work);
+	bat_priv = container_of(priv_nc, struct batadv_priv, nc);
+
+	batadv_nc_purge_orig_hash(bat_priv);
+	batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash,
+			      batadv_nc_to_purge_nc_path_coding);
+	batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash,
+			      batadv_nc_to_purge_nc_path_decoding);
+
+	timeout = bat_priv->nc.max_fwd_delay;
+
+	if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) {
+		batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash,
+					   batadv_nc_fwd_flush);
+		bat_priv->nc.timestamp_fwd_flush = jiffies;
+	}
+
+	if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge,
+				 bat_priv->nc.max_buffer_time)) {
+		batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash,
+					   batadv_nc_sniffed_purge);
+		bat_priv->nc.timestamp_sniffed_purge = jiffies;
+	}
+
+	/* Schedule a new check */
+	batadv_nc_start_timer(bat_priv);
+}
+
+/**
+ * batadv_can_nc_with_orig - checks whether the given orig node is suitable for
+ *  coding or not
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: neighboring orig node which may be used as nc candidate
+ * @ogm_packet: incoming ogm packet also used for the checks
+ *
+ * Returns true if:
+ *  1) The OGM must have the most recent sequence number.
+ *  2) The TTL must be decremented by one and only one.
+ *  3) The OGM must be received from the first hop from orig_node.
+ *  4) The TQ value of the OGM must be above bat_priv->nc.min_tq.
+ */
+static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv,
+				    struct batadv_orig_node *orig_node,
+				    struct batadv_ogm_packet *ogm_packet)
+{
+	if (orig_node->last_real_seqno != ntohl(ogm_packet->seqno))
+		return false;
+	if (orig_node->last_ttl != ogm_packet->header.ttl + 1)
+		return false;
+	if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender))
+		return false;
+	if (ogm_packet->tq < bat_priv->nc.min_tq)
+		return false;
+
+	return true;
+}
+
+/**
+ * batadv_nc_find_nc_node - search for an existing nc node and return it
+ * @orig_node: orig node originating the ogm packet
+ * @orig_neigh_node: neighboring orig node from which we received the ogm packet
+ *  (can be equal to orig_node)
+ * @in_coding: traverse incoming or outgoing network coding list
+ *
+ * Returns the nc_node if found, NULL otherwise.
+ */
+static struct batadv_nc_node
+*batadv_nc_find_nc_node(struct batadv_orig_node *orig_node,
+			struct batadv_orig_node *orig_neigh_node,
+			bool in_coding)
+{
+	struct batadv_nc_node *nc_node, *nc_node_out = NULL;
+	struct list_head *list;
+
+	if (in_coding)
+		list = &orig_neigh_node->in_coding_list;
+	else
+		list = &orig_neigh_node->out_coding_list;
+
+	/* Traverse list of nc_nodes to orig_node */
+	rcu_read_lock();
+	list_for_each_entry_rcu(nc_node, list, list) {
+		if (!batadv_compare_eth(nc_node->addr, orig_node->orig))
+			continue;
+
+		if (!atomic_inc_not_zero(&nc_node->refcount))
+			continue;
+
+		/* Found a match */
+		nc_node_out = nc_node;
+		break;
+	}
+	rcu_read_unlock();
+
+	return nc_node_out;
+}
+
+/**
+ * batadv_nc_get_nc_node - retrieves an nc node or creates the entry if it was
+ *  not found
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: orig node originating the ogm packet
+ * @orig_neigh_node: neighboring orig node from which we received the ogm packet
+ *  (can be equal to orig_node)
+ * @in_coding: traverse incoming or outgoing network coding list
+ *
+ * Returns the nc_node if found or created, NULL in case of an error.
+ */
+static struct batadv_nc_node
+*batadv_nc_get_nc_node(struct batadv_priv *bat_priv,
+		       struct batadv_orig_node *orig_node,
+		       struct batadv_orig_node *orig_neigh_node,
+		       bool in_coding)
+{
+	struct batadv_nc_node *nc_node;
+	spinlock_t *lock; /* Used to lock list selected by "int in_coding" */
+	struct list_head *list;
+
+	/* Check if nc_node is already added */
+	nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding);
+
+	/* Node found */
+	if (nc_node)
+		return nc_node;
+
+	nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC);
+	if (!nc_node)
+		return NULL;
+
+	if (!atomic_inc_not_zero(&orig_neigh_node->refcount))
+		goto free;
+
+	/* Initialize nc_node */
+	INIT_LIST_HEAD(&nc_node->list);
+	memcpy(nc_node->addr, orig_node->orig, ETH_ALEN);
+	nc_node->orig_node = orig_neigh_node;
+	atomic_set(&nc_node->refcount, 2);
+
+	/* Select ingoing or outgoing coding node */
+	if (in_coding) {
+		lock = &orig_neigh_node->in_coding_list_lock;
+		list = &orig_neigh_node->in_coding_list;
+	} else {
+		lock = &orig_neigh_node->out_coding_list_lock;
+		list = &orig_neigh_node->out_coding_list;
+	}
+
+	batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n",
+		   nc_node->addr, nc_node->orig_node->orig);
+
+	/* Add nc_node to orig_node */
+	spin_lock_bh(lock);
+	list_add_tail_rcu(&nc_node->list, list);
+	spin_unlock_bh(lock);
+
+	return nc_node;
+
+free:
+	kfree(nc_node);
+	return NULL;
+}
+
+/**
+ * batadv_nc_update_nc_node - updates stored incoming and outgoing nc node structs
+ *  (best called on incoming OGMs)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: orig node originating the ogm packet
+ * @orig_neigh_node: neighboring orig node from which we received the ogm packet
+ *  (can be equal to orig_node)
+ * @ogm_packet: incoming ogm packet
+ * @is_single_hop_neigh: orig_node is a single hop neighbor
+ */
+void batadv_nc_update_nc_node(struct batadv_priv *bat_priv,
+			      struct batadv_orig_node *orig_node,
+			      struct batadv_orig_node *orig_neigh_node,
+			      struct batadv_ogm_packet *ogm_packet,
+			      int is_single_hop_neigh)
+{
+	struct batadv_nc_node *in_nc_node = NULL, *out_nc_node = NULL;
+
+	/* Check if network coding is enabled */
+	if (!atomic_read(&bat_priv->network_coding))
+		goto out;
+
+	/* accept ogms from 'good' neighbors and single hop neighbors */
+	if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) &&
+	    !is_single_hop_neigh)
+		goto out;
+
+	/* Add orig_node as in_nc_node on hop */
+	in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node,
+					   orig_neigh_node, true);
+	if (!in_nc_node)
+		goto out;
+
+	in_nc_node->last_seen = jiffies;
+
+	/* Add hop as out_nc_node on orig_node */
+	out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node,
+					    orig_node, false);
+	if (!out_nc_node)
+		goto out;
+
+	out_nc_node->last_seen = jiffies;
+
+out:
+	if (in_nc_node)
+		batadv_nc_node_free_ref(in_nc_node);
+	if (out_nc_node)
+		batadv_nc_node_free_ref(out_nc_node);
+}
+
+/**
+ * batadv_nc_get_path - get existing nc_path or allocate a new one
+ * @bat_priv: the bat priv with all the soft interface information
+ * @hash: hash table containing the nc path
+ * @src: ethernet source address - first half of the nc path search key
+ * @dst: ethernet destination address - second half of the nc path search key
+ *
+ * Returns pointer to nc_path if the path was found or created, returns NULL
+ * on error.
+ */
+static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv,
+						 struct batadv_hashtable *hash,
+						 uint8_t *src,
+						 uint8_t *dst)
+{
+	int hash_added;
+	struct batadv_nc_path *nc_path, nc_path_key;
+
+	batadv_nc_hash_key_gen(&nc_path_key, src, dst);
+
+	/* Search for existing nc_path */
+	nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key);
+
+	if (nc_path) {
+		/* Set timestamp to delay removal of nc_path */
+		nc_path->last_valid = jiffies;
+		return nc_path;
+	}
+
+	/* No existing nc_path was found; create a new */
+	nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC);
+
+	if (!nc_path)
+		return NULL;
+
+	/* Initialize nc_path */
+	INIT_LIST_HEAD(&nc_path->packet_list);
+	spin_lock_init(&nc_path->packet_list_lock);
+	atomic_set(&nc_path->refcount, 2);
+	nc_path->last_valid = jiffies;
+	memcpy(nc_path->next_hop, dst, ETH_ALEN);
+	memcpy(nc_path->prev_hop, src, ETH_ALEN);
+
+	batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n",
+		   nc_path->prev_hop,
+		   nc_path->next_hop);
+
+	/* Add nc_path to hash table */
+	hash_added = batadv_hash_add(hash, batadv_nc_hash_compare,
+				     batadv_nc_hash_choose, &nc_path_key,
+				     &nc_path->hash_entry);
+
+	if (hash_added < 0) {
+		kfree(nc_path);
+		return NULL;
+	}
+
+	return nc_path;
+}
+
+/**
+ * batadv_nc_random_weight_tq - scale the receivers TQ-value to avoid unfair
+ *  selection of a receiver with slightly lower TQ than the other
+ * @tq: to be weighted tq value
+ */
+static uint8_t batadv_nc_random_weight_tq(uint8_t tq)
+{
+	uint8_t rand_val, rand_tq;
+
+	get_random_bytes(&rand_val, sizeof(rand_val));
+
+	/* randomize the estimated packet loss (max TQ - estimated TQ) */
+	rand_tq = rand_val * (BATADV_TQ_MAX_VALUE - tq);
+
+	/* normalize the randomized packet loss */
+	rand_tq /= BATADV_TQ_MAX_VALUE;
+
+	/* convert to (randomized) estimated tq again */
+	return BATADV_TQ_MAX_VALUE - rand_tq;
+}
+
+/**
+ * batadv_nc_memxor - XOR destination with source
+ * @dst: byte array to XOR into
+ * @src: byte array to XOR from
+ * @len: length of destination array
+ */
+static void batadv_nc_memxor(char *dst, const char *src, unsigned int len)
+{
+	unsigned int i;
+
+	for (i = 0; i < len; ++i)
+		dst[i] ^= src[i];
+}
+
+/**
+ * batadv_nc_code_packets - code a received unicast_packet with an nc packet
+ *  into a coded_packet and send it
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: data skb to forward
+ * @ethhdr: pointer to the ethernet header inside the skb
+ * @nc_packet: structure containing the packet to the skb can be coded with
+ * @neigh_node: next hop to forward packet to
+ *
+ * Returns true if both packets are consumed, false otherwise.
+ */
+static bool batadv_nc_code_packets(struct batadv_priv *bat_priv,
+				   struct sk_buff *skb,
+				   struct ethhdr *ethhdr,
+				   struct batadv_nc_packet *nc_packet,
+				   struct batadv_neigh_node *neigh_node)
+{
+	uint8_t tq_weighted_neigh, tq_weighted_coding;
+	struct sk_buff *skb_dest, *skb_src;
+	struct batadv_unicast_packet *packet1;
+	struct batadv_unicast_packet *packet2;
+	struct batadv_coded_packet *coded_packet;
+	struct batadv_neigh_node *neigh_tmp, *router_neigh;
+	struct batadv_neigh_node *router_coding = NULL;
+	uint8_t *first_source, *first_dest, *second_source, *second_dest;
+	__be32 packet_id1, packet_id2;
+	size_t count;
+	bool res = false;
+	int coding_len;
+	int unicast_size = sizeof(*packet1);
+	int coded_size = sizeof(*coded_packet);
+	int header_add = coded_size - unicast_size;
+
+	router_neigh = batadv_orig_node_get_router(neigh_node->orig_node);
+	if (!router_neigh)
+		goto out;
+
+	neigh_tmp = nc_packet->neigh_node;
+	router_coding = batadv_orig_node_get_router(neigh_tmp->orig_node);
+	if (!router_coding)
+		goto out;
+
+	tq_weighted_neigh = batadv_nc_random_weight_tq(router_neigh->tq_avg);
+	tq_weighted_coding = batadv_nc_random_weight_tq(router_coding->tq_avg);
+
+	/* Select one destination for the MAC-header dst-field based on
+	 * weighted TQ-values.
+	 */
+	if (tq_weighted_neigh >= tq_weighted_coding) {
+		/* Destination from nc_packet is selected for MAC-header */
+		first_dest = nc_packet->nc_path->next_hop;
+		first_source = nc_packet->nc_path->prev_hop;
+		second_dest = neigh_node->addr;
+		second_source = ethhdr->h_source;
+		packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data;
+		packet2 = (struct batadv_unicast_packet *)skb->data;
+		packet_id1 = nc_packet->packet_id;
+		packet_id2 = batadv_skb_crc32(skb,
+					      skb->data + sizeof(*packet2));
+	} else {
+		/* Destination for skb is selected for MAC-header */
+		first_dest = neigh_node->addr;
+		first_source = ethhdr->h_source;
+		second_dest = nc_packet->nc_path->next_hop;
+		second_source = nc_packet->nc_path->prev_hop;
+		packet1 = (struct batadv_unicast_packet *)skb->data;
+		packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data;
+		packet_id1 = batadv_skb_crc32(skb,
+					      skb->data + sizeof(*packet1));
+		packet_id2 = nc_packet->packet_id;
+	}
+
+	/* Instead of zero padding the smallest data buffer, we
+	 * code into the largest.
+	 */
+	if (skb->len <= nc_packet->skb->len) {
+		skb_dest = nc_packet->skb;
+		skb_src = skb;
+	} else {
+		skb_dest = skb;
+		skb_src = nc_packet->skb;
+	}
+
+	/* coding_len is used when decoding the packet shorter packet */
+	coding_len = skb_src->len - unicast_size;
+
+	if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0)
+		goto out;
+
+	skb_push(skb_dest, header_add);
+
+	coded_packet = (struct batadv_coded_packet *)skb_dest->data;
+	skb_reset_mac_header(skb_dest);
+
+	coded_packet->header.packet_type = BATADV_CODED;
+	coded_packet->header.version = BATADV_COMPAT_VERSION;
+	coded_packet->header.ttl = packet1->header.ttl;
+
+	/* Info about first unicast packet */
+	memcpy(coded_packet->first_source, first_source, ETH_ALEN);
+	memcpy(coded_packet->first_orig_dest, packet1->dest, ETH_ALEN);
+	coded_packet->first_crc = packet_id1;
+	coded_packet->first_ttvn = packet1->ttvn;
+
+	/* Info about second unicast packet */
+	memcpy(coded_packet->second_dest, second_dest, ETH_ALEN);
+	memcpy(coded_packet->second_source, second_source, ETH_ALEN);
+	memcpy(coded_packet->second_orig_dest, packet2->dest, ETH_ALEN);
+	coded_packet->second_crc = packet_id2;
+	coded_packet->second_ttl = packet2->header.ttl;
+	coded_packet->second_ttvn = packet2->ttvn;
+	coded_packet->coded_len = htons(coding_len);
+
+	/* This is where the magic happens: Code skb_src into skb_dest */
+	batadv_nc_memxor(skb_dest->data + coded_size,
+			 skb_src->data + unicast_size, coding_len);
+
+	/* Update counters accordingly */
+	if (BATADV_SKB_CB(skb_src)->decoded &&
+	    BATADV_SKB_CB(skb_dest)->decoded) {
+		/* Both packets are recoded */
+		count = skb_src->len + ETH_HLEN;
+		count += skb_dest->len + ETH_HLEN;
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2);
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count);
+	} else if (!BATADV_SKB_CB(skb_src)->decoded &&
+		   !BATADV_SKB_CB(skb_dest)->decoded) {
+		/* Both packets are newly coded */
+		count = skb_src->len + ETH_HLEN;
+		count += skb_dest->len + ETH_HLEN;
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2);
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count);
+	} else if (BATADV_SKB_CB(skb_src)->decoded &&
+		   !BATADV_SKB_CB(skb_dest)->decoded) {
+		/* skb_src recoded and skb_dest is newly coded */
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE);
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES,
+				   skb_src->len + ETH_HLEN);
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE);
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES,
+				   skb_dest->len + ETH_HLEN);
+	} else if (!BATADV_SKB_CB(skb_src)->decoded &&
+		   BATADV_SKB_CB(skb_dest)->decoded) {
+		/* skb_src is newly coded and skb_dest is recoded */
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE);
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES,
+				   skb_src->len + ETH_HLEN);
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE);
+		batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES,
+				   skb_dest->len + ETH_HLEN);
+	}
+
+	/* skb_src is now coded into skb_dest, so free it */
+	kfree_skb(skb_src);
+
+	/* avoid duplicate free of skb from nc_packet */
+	nc_packet->skb = NULL;
+	batadv_nc_packet_free(nc_packet);
+
+	/* Send the coded packet and return true */
+	batadv_send_skb_packet(skb_dest, neigh_node->if_incoming, first_dest);
+	res = true;
+out:
+	if (router_neigh)
+		batadv_neigh_node_free_ref(router_neigh);
+	if (router_coding)
+		batadv_neigh_node_free_ref(router_coding);
+	return res;
+}
+
+/**
+ * batadv_nc_skb_coding_possible - true if a decoded skb is available at dst.
+ * @skb: data skb to forward
+ * @dst: destination mac address of the other skb to code with
+ * @src: source mac address of skb
+ *
+ * Whenever we network code a packet we have to check whether we received it in
+ * a network coded form. If so, we may not be able to use it for coding because
+ * some neighbors may also have received (overheard) the packet in the network
+ * coded form without being able to decode it. It is hard to know which of the
+ * neighboring nodes was able to decode the packet, therefore we can only
+ * re-code the packet if the source of the previous encoded packet is involved.
+ * Since the source encoded the packet we can be certain it has all necessary
+ * decode information.
+ *
+ * Returns true if coding of a decoded packet is allowed.
+ */
+static bool batadv_nc_skb_coding_possible(struct sk_buff *skb,
+					  uint8_t *dst, uint8_t *src)
+{
+	if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src))
+		return false;
+	else
+		return true;
+}
+
+/**
+ * batadv_nc_path_search - Find the coding path matching in_nc_node and
+ *  out_nc_node to retrieve a buffered packet that can be used for coding.
+ * @bat_priv: the bat priv with all the soft interface information
+ * @in_nc_node: pointer to skb next hop's neighbor nc node
+ * @out_nc_node: pointer to skb source's neighbor nc node
+ * @skb: data skb to forward
+ * @eth_dst: next hop mac address of skb
+ *
+ * Returns true if coding of a decoded skb is allowed.
+ */
+static struct batadv_nc_packet *
+batadv_nc_path_search(struct batadv_priv *bat_priv,
+		      struct batadv_nc_node *in_nc_node,
+		      struct batadv_nc_node *out_nc_node,
+		      struct sk_buff *skb,
+		      uint8_t *eth_dst)
+{
+	struct batadv_nc_path *nc_path, nc_path_key;
+	struct batadv_nc_packet *nc_packet_out = NULL;
+	struct batadv_nc_packet *nc_packet, *nc_packet_tmp;
+	struct batadv_hashtable *hash = bat_priv->nc.coding_hash;
+	int idx;
+
+	if (!hash)
+		return NULL;
+
+	/* Create almost path key */
+	batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr,
+			       out_nc_node->addr);
+	idx = batadv_nc_hash_choose(&nc_path_key, hash->size);
+
+	/* Check for coding opportunities in this nc_path */
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) {
+		if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr))
+			continue;
+
+		if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr))
+			continue;
+
+		spin_lock_bh(&nc_path->packet_list_lock);
+		if (list_empty(&nc_path->packet_list)) {
+			spin_unlock_bh(&nc_path->packet_list_lock);
+			continue;
+		}
+
+		list_for_each_entry_safe(nc_packet, nc_packet_tmp,
+					 &nc_path->packet_list, list) {
+			if (!batadv_nc_skb_coding_possible(nc_packet->skb,
+							   eth_dst,
+							   in_nc_node->addr))
+				continue;
+
+			/* Coding opportunity is found! */
+			list_del(&nc_packet->list);
+			nc_packet_out = nc_packet;
+			break;
+		}
+
+		spin_unlock_bh(&nc_path->packet_list_lock);
+		break;
+	}
+	rcu_read_unlock();
+
+	return nc_packet_out;
+}
+
+/**
+ * batadv_nc_skb_src_search - Loops through the list of neighoring nodes of the
+ *  skb's sender (may be equal to the originator).
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: data skb to forward
+ * @eth_dst: next hop mac address of skb
+ * @eth_src: source mac address of skb
+ * @in_nc_node: pointer to skb next hop's neighbor nc node
+ *
+ * Returns an nc packet if a suitable coding packet was found, NULL otherwise.
+ */
+static struct batadv_nc_packet *
+batadv_nc_skb_src_search(struct batadv_priv *bat_priv,
+			 struct sk_buff *skb,
+			 uint8_t *eth_dst,
+			 uint8_t *eth_src,
+			 struct batadv_nc_node *in_nc_node)
+{
+	struct batadv_orig_node *orig_node;
+	struct batadv_nc_node *out_nc_node;
+	struct batadv_nc_packet *nc_packet = NULL;
+
+	orig_node = batadv_orig_hash_find(bat_priv, eth_src);
+	if (!orig_node)
+		return NULL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(out_nc_node,
+				&orig_node->out_coding_list, list) {
+		/* Check if the skb is decoded and if recoding is possible */
+		if (!batadv_nc_skb_coding_possible(skb,
+						   out_nc_node->addr, eth_src))
+			continue;
+
+		/* Search for an opportunity in this nc_path */
+		nc_packet = batadv_nc_path_search(bat_priv, in_nc_node,
+						  out_nc_node, skb, eth_dst);
+		if (nc_packet)
+			break;
+	}
+	rcu_read_unlock();
+
+	batadv_orig_node_free_ref(orig_node);
+	return nc_packet;
+}
+
+/**
+ * batadv_nc_skb_store_before_coding - set the ethernet src and dst of the
+ *  unicast skb before it is stored for use in later decoding
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: data skb to store
+ * @eth_dst_new: new destination mac address of skb
+ */
+static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv,
+					      struct sk_buff *skb,
+					      uint8_t *eth_dst_new)
+{
+	struct ethhdr *ethhdr;
+
+	/* Copy skb header to change the mac header */
+	skb = pskb_copy(skb, GFP_ATOMIC);
+	if (!skb)
+		return;
+
+	/* Set the mac header as if we actually sent the packet uncoded */
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+	memcpy(ethhdr->h_source, ethhdr->h_dest, ETH_ALEN);
+	memcpy(ethhdr->h_dest, eth_dst_new, ETH_ALEN);
+
+	/* Set data pointer to MAC header to mimic packets from our tx path */
+	skb_push(skb, ETH_HLEN);
+
+	/* Add the packet to the decoding packet pool */
+	batadv_nc_skb_store_for_decoding(bat_priv, skb);
+
+	/* batadv_nc_skb_store_for_decoding() clones the skb, so we must free
+	 * our ref
+	 */
+	kfree_skb(skb);
+}
+
+/**
+ * batadv_nc_skb_dst_search - Loops through list of neighboring nodes to dst.
+ * @skb: data skb to forward
+ * @neigh_node: next hop to forward packet to
+ * @ethhdr: pointer to the ethernet header inside the skb
+ *
+ * Loops through list of neighboring nodes the next hop has a good connection to
+ * (receives OGMs with a sufficient quality). We need to find a neighbor of our
+ * next hop that potentially sent a packet which our next hop also received
+ * (overheard) and has stored for later decoding.
+ *
+ * Returns true if the skb was consumed (encoded packet sent) or false otherwise
+ */
+static bool batadv_nc_skb_dst_search(struct sk_buff *skb,
+				     struct batadv_neigh_node *neigh_node,
+				     struct ethhdr *ethhdr)
+{
+	struct net_device *netdev = neigh_node->if_incoming->soft_iface;
+	struct batadv_priv *bat_priv = netdev_priv(netdev);
+	struct batadv_orig_node *orig_node = neigh_node->orig_node;
+	struct batadv_nc_node *nc_node;
+	struct batadv_nc_packet *nc_packet = NULL;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) {
+		/* Search for coding opportunity with this in_nc_node */
+		nc_packet = batadv_nc_skb_src_search(bat_priv, skb,
+						     neigh_node->addr,
+						     ethhdr->h_source, nc_node);
+
+		/* Opportunity was found, so stop searching */
+		if (nc_packet)
+			break;
+	}
+	rcu_read_unlock();
+
+	if (!nc_packet)
+		return false;
+
+	/* Save packets for later decoding */
+	batadv_nc_skb_store_before_coding(bat_priv, skb,
+					  neigh_node->addr);
+	batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb,
+					  nc_packet->neigh_node->addr);
+
+	/* Code and send packets */
+	if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet,
+				   neigh_node))
+		return true;
+
+	/* out of mem ? Coding failed - we have to free the buffered packet
+	 * to avoid memleaks. The skb passed as argument will be dealt with
+	 * by the calling function.
+	 */
+	batadv_nc_send_packet(nc_packet);
+	return false;
+}
+
+/**
+ * batadv_nc_skb_add_to_path - buffer skb for later encoding / decoding
+ * @skb: skb to add to path
+ * @nc_path: path to add skb to
+ * @neigh_node: next hop to forward packet to
+ * @packet_id: checksum to identify packet
+ *
+ * Returns true if the packet was buffered or false in case of an error.
+ */
+static bool batadv_nc_skb_add_to_path(struct sk_buff *skb,
+				      struct batadv_nc_path *nc_path,
+				      struct batadv_neigh_node *neigh_node,
+				      __be32 packet_id)
+{
+	struct batadv_nc_packet *nc_packet;
+
+	nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC);
+	if (!nc_packet)
+		return false;
+
+	/* Initialize nc_packet */
+	nc_packet->timestamp = jiffies;
+	nc_packet->packet_id = packet_id;
+	nc_packet->skb = skb;
+	nc_packet->neigh_node = neigh_node;
+	nc_packet->nc_path = nc_path;
+
+	/* Add coding packet to list */
+	spin_lock_bh(&nc_path->packet_list_lock);
+	list_add_tail(&nc_packet->list, &nc_path->packet_list);
+	spin_unlock_bh(&nc_path->packet_list_lock);
+
+	return true;
+}
+
+/**
+ * batadv_nc_skb_forward - try to code a packet or add it to the coding packet
+ *  buffer
+ * @skb: data skb to forward
+ * @neigh_node: next hop to forward packet to
+ * @ethhdr: pointer to the ethernet header inside the skb
+ *
+ * Returns true if the skb was consumed (encoded packet sent) or false otherwise
+ */
+bool batadv_nc_skb_forward(struct sk_buff *skb,
+			   struct batadv_neigh_node *neigh_node,
+			   struct ethhdr *ethhdr)
+{
+	const struct net_device *netdev = neigh_node->if_incoming->soft_iface;
+	struct batadv_priv *bat_priv = netdev_priv(netdev);
+	struct batadv_unicast_packet *packet;
+	struct batadv_nc_path *nc_path;
+	__be32 packet_id;
+	u8 *payload;
+
+	/* Check if network coding is enabled */
+	if (!atomic_read(&bat_priv->network_coding))
+		goto out;
+
+	/* We only handle unicast packets */
+	payload = skb_network_header(skb);
+	packet = (struct batadv_unicast_packet *)payload;
+	if (packet->header.packet_type != BATADV_UNICAST)
+		goto out;
+
+	/* Try to find a coding opportunity and send the skb if one is found */
+	if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr))
+		return true;
+
+	/* Find or create a nc_path for this src-dst pair */
+	nc_path = batadv_nc_get_path(bat_priv,
+				     bat_priv->nc.coding_hash,
+				     ethhdr->h_source,
+				     neigh_node->addr);
+
+	if (!nc_path)
+		goto out;
+
+	/* Add skb to nc_path */
+	packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet));
+	if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id))
+		goto free_nc_path;
+
+	/* Packet is consumed */
+	return true;
+
+free_nc_path:
+	batadv_nc_path_free_ref(nc_path);
+out:
+	/* Packet is not consumed */
+	return false;
+}
+
+/**
+ * batadv_nc_skb_store_for_decoding - save a clone of the skb which can be used
+ *  when decoding coded packets
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: data skb to store
+ */
+void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv,
+				      struct sk_buff *skb)
+{
+	struct batadv_unicast_packet *packet;
+	struct batadv_nc_path *nc_path;
+	struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
+	__be32 packet_id;
+	u8 *payload;
+
+	/* Check if network coding is enabled */
+	if (!atomic_read(&bat_priv->network_coding))
+		goto out;
+
+	/* Check for supported packet type */
+	payload = skb_network_header(skb);
+	packet = (struct batadv_unicast_packet *)payload;
+	if (packet->header.packet_type != BATADV_UNICAST)
+		goto out;
+
+	/* Find existing nc_path or create a new */
+	nc_path = batadv_nc_get_path(bat_priv,
+				     bat_priv->nc.decoding_hash,
+				     ethhdr->h_source,
+				     ethhdr->h_dest);
+
+	if (!nc_path)
+		goto out;
+
+	/* Clone skb and adjust skb->data to point at batman header */
+	skb = skb_clone(skb, GFP_ATOMIC);
+	if (unlikely(!skb))
+		goto free_nc_path;
+
+	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+		goto free_skb;
+
+	if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN)))
+		goto free_skb;
+
+	/* Add skb to nc_path */
+	packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet));
+	if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id))
+		goto free_skb;
+
+	batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER);
+	return;
+
+free_skb:
+	kfree_skb(skb);
+free_nc_path:
+	batadv_nc_path_free_ref(nc_path);
+out:
+	return;
+}
+
+/**
+ * batadv_nc_skb_store_sniffed_unicast - check if a received unicast packet
+ *  should be saved in the decoding buffer and, if so, store it there
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: unicast skb to store
+ */
+void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv,
+					 struct sk_buff *skb)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	if (batadv_is_my_mac(bat_priv, ethhdr->h_dest))
+		return;
+
+	/* Set data pointer to MAC header to mimic packets from our tx path */
+	skb_push(skb, ETH_HLEN);
+
+	batadv_nc_skb_store_for_decoding(bat_priv, skb);
+}
+
+/**
+ * batadv_nc_skb_decode_packet - decode given skb using the decode data stored
+ *  in nc_packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: unicast skb to decode
+ * @nc_packet: decode data needed to decode the skb
+ *
+ * Returns pointer to decoded unicast packet if the packet was decoded or NULL
+ * in case of an error.
+ */
+static struct batadv_unicast_packet *
+batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
+			    struct batadv_nc_packet *nc_packet)
+{
+	const int h_size = sizeof(struct batadv_unicast_packet);
+	const int h_diff = sizeof(struct batadv_coded_packet) - h_size;
+	struct batadv_unicast_packet *unicast_packet;
+	struct batadv_coded_packet coded_packet_tmp;
+	struct ethhdr *ethhdr, ethhdr_tmp;
+	uint8_t *orig_dest, ttl, ttvn;
+	unsigned int coding_len;
+
+	/* Save headers temporarily */
+	memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp));
+	memcpy(&ethhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp));
+
+	if (skb_cow(skb, 0) < 0)
+		return NULL;
+
+	if (unlikely(!skb_pull_rcsum(skb, h_diff)))
+		return NULL;
+
+	/* Data points to batman header, so set mac header 14 bytes before
+	 * and network to data
+	 */
+	skb_set_mac_header(skb, -ETH_HLEN);
+	skb_reset_network_header(skb);
+
+	/* Reconstruct original mac header */
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+	memcpy(ethhdr, &ethhdr_tmp, sizeof(*ethhdr));
+
+	/* Select the correct unicast header information based on the location
+	 * of our mac address in the coded_packet header
+	 */
+	if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) {
+		/* If we are the second destination the packet was overheard,
+		 * so the Ethernet address must be copied to h_dest and
+		 * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST
+		 */
+		memcpy(ethhdr->h_dest, coded_packet_tmp.second_dest, ETH_ALEN);
+		skb->pkt_type = PACKET_HOST;
+
+		orig_dest = coded_packet_tmp.second_orig_dest;
+		ttl = coded_packet_tmp.second_ttl;
+		ttvn = coded_packet_tmp.second_ttvn;
+	} else {
+		orig_dest = coded_packet_tmp.first_orig_dest;
+		ttl = coded_packet_tmp.header.ttl;
+		ttvn = coded_packet_tmp.first_ttvn;
+	}
+
+	coding_len = ntohs(coded_packet_tmp.coded_len);
+
+	if (coding_len > skb->len)
+		return NULL;
+
+	/* Here the magic is reversed:
+	 *   extract the missing packet from the received coded packet
+	 */
+	batadv_nc_memxor(skb->data + h_size,
+			 nc_packet->skb->data + h_size,
+			 coding_len);
+
+	/* Resize decoded skb if decoded with larger packet */
+	if (nc_packet->skb->len > coding_len + h_size)
+		pskb_trim_rcsum(skb, coding_len + h_size);
+
+	/* Create decoded unicast packet */
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
+	unicast_packet->header.packet_type = BATADV_UNICAST;
+	unicast_packet->header.version = BATADV_COMPAT_VERSION;
+	unicast_packet->header.ttl = ttl;
+	memcpy(unicast_packet->dest, orig_dest, ETH_ALEN);
+	unicast_packet->ttvn = ttvn;
+
+	batadv_nc_packet_free(nc_packet);
+	return unicast_packet;
+}
+
+/**
+ * batadv_nc_find_decoding_packet - search through buffered decoding data to
+ *  find the data needed to decode the coded packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ethhdr: pointer to the ethernet header inside the coded packet
+ * @coded: coded packet we try to find decode data for
+ *
+ * Returns pointer to nc packet if the needed data was found or NULL otherwise.
+ */
+static struct batadv_nc_packet *
+batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv,
+			       struct ethhdr *ethhdr,
+			       struct batadv_coded_packet *coded)
+{
+	struct batadv_hashtable *hash = bat_priv->nc.decoding_hash;
+	struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL;
+	struct batadv_nc_path *nc_path, nc_path_key;
+	uint8_t *dest, *source;
+	__be32 packet_id;
+	int index;
+
+	if (!hash)
+		return NULL;
+
+	/* Select the correct packet id based on the location of our mac-addr */
+	dest = ethhdr->h_source;
+	if (!batadv_is_my_mac(bat_priv, coded->second_dest)) {
+		source = coded->second_source;
+		packet_id = coded->second_crc;
+	} else {
+		source = coded->first_source;
+		packet_id = coded->first_crc;
+	}
+
+	batadv_nc_hash_key_gen(&nc_path_key, source, dest);
+	index = batadv_nc_hash_choose(&nc_path_key, hash->size);
+
+	/* Search for matching coding path */
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) {
+		/* Find matching nc_packet */
+		spin_lock_bh(&nc_path->packet_list_lock);
+		list_for_each_entry(tmp_nc_packet,
+				    &nc_path->packet_list, list) {
+			if (packet_id == tmp_nc_packet->packet_id) {
+				list_del(&tmp_nc_packet->list);
+
+				nc_packet = tmp_nc_packet;
+				break;
+			}
+		}
+		spin_unlock_bh(&nc_path->packet_list_lock);
+
+		if (nc_packet)
+			break;
+	}
+	rcu_read_unlock();
+
+	if (!nc_packet)
+		batadv_dbg(BATADV_DBG_NC, bat_priv,
+			   "No decoding packet found for %u\n", packet_id);
+
+	return nc_packet;
+}
+
+/**
+ * batadv_nc_recv_coded_packet - try to decode coded packet and enqueue the
+ *  resulting unicast packet
+ * @skb: incoming coded packet
+ * @recv_if: pointer to interface this packet was received on
+ */
+static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
+				       struct batadv_hard_iface *recv_if)
+{
+	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct batadv_unicast_packet *unicast_packet;
+	struct batadv_coded_packet *coded_packet;
+	struct batadv_nc_packet *nc_packet;
+	struct ethhdr *ethhdr;
+	int hdr_size = sizeof(*coded_packet);
+
+	/* Check if network coding is enabled */
+	if (!atomic_read(&bat_priv->network_coding))
+		return NET_RX_DROP;
+
+	/* Make sure we can access (and remove) header */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	coded_packet = (struct batadv_coded_packet *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* Verify frame is destined for us */
+	if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) &&
+	    !batadv_is_my_mac(bat_priv, coded_packet->second_dest))
+		return NET_RX_DROP;
+
+	/* Update stat counter */
+	if (batadv_is_my_mac(bat_priv, coded_packet->second_dest))
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED);
+
+	nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr,
+						   coded_packet);
+	if (!nc_packet) {
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED);
+		return NET_RX_DROP;
+	}
+
+	/* Make skb's linear, because decoding accesses the entire buffer */
+	if (skb_linearize(skb) < 0)
+		goto free_nc_packet;
+
+	if (skb_linearize(nc_packet->skb) < 0)
+		goto free_nc_packet;
+
+	/* Decode the packet */
+	unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet);
+	if (!unicast_packet) {
+		batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED);
+		goto free_nc_packet;
+	}
+
+	/* Mark packet as decoded to do correct recoding when forwarding */
+	BATADV_SKB_CB(skb)->decoded = true;
+	batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE);
+	batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES,
+			   skb->len + ETH_HLEN);
+	return batadv_recv_unicast_packet(skb, recv_if);
+
+free_nc_packet:
+	batadv_nc_packet_free(nc_packet);
+	return NET_RX_DROP;
+}
+
+/**
+ * batadv_nc_free - clean up network coding memory
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+void batadv_nc_free(struct batadv_priv *bat_priv)
+{
+	batadv_recv_handler_unregister(BATADV_CODED);
+	cancel_delayed_work_sync(&bat_priv->nc.work);
+
+	batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL);
+	batadv_hash_destroy(bat_priv->nc.coding_hash);
+	batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL);
+	batadv_hash_destroy(bat_priv->nc.decoding_hash);
+}
+
+/**
+ * batadv_nc_nodes_seq_print_text - print the nc node information
+ * @seq: seq file to print on
+ * @offset: not used
+ */
+int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct batadv_priv *bat_priv = netdev_priv(net_dev);
+	struct batadv_hashtable *hash = bat_priv->orig_hash;
+	struct batadv_hard_iface *primary_if;
+	struct hlist_head *head;
+	struct batadv_orig_node *orig_node;
+	struct batadv_nc_node *nc_node;
+	int i;
+
+	primary_if = batadv_seq_print_text_primary_if_get(seq);
+	if (!primary_if)
+		goto out;
+
+	/* Traverse list of originators */
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		/* For each orig_node in this bin */
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
+			seq_printf(seq, "Node:      %pM\n", orig_node->orig);
+
+			seq_puts(seq, " Ingoing:  ");
+			/* For each in_nc_node to this orig_node */
+			list_for_each_entry_rcu(nc_node,
+						&orig_node->in_coding_list,
+						list)
+				seq_printf(seq, "%pM ",
+					   nc_node->addr);
+			seq_puts(seq, "\n");
+
+			seq_puts(seq, " Outgoing: ");
+			/* For out_nc_node to this orig_node */
+			list_for_each_entry_rcu(nc_node,
+						&orig_node->out_coding_list,
+						list)
+				seq_printf(seq, "%pM ",
+					   nc_node->addr);
+			seq_puts(seq, "\n\n");
+		}
+		rcu_read_unlock();
+	}
+
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+	return 0;
+}
+
+/**
+ * batadv_nc_init_debugfs - create nc folder and related files in debugfs
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+int batadv_nc_init_debugfs(struct batadv_priv *bat_priv)
+{
+	struct dentry *nc_dir, *file;
+
+	nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir);
+	if (!nc_dir)
+		goto out;
+
+	file = debugfs_create_u8("min_tq", S_IRUGO | S_IWUSR, nc_dir,
+				 &bat_priv->nc.min_tq);
+	if (!file)
+		goto out;
+
+	file = debugfs_create_u32("max_fwd_delay", S_IRUGO | S_IWUSR, nc_dir,
+				  &bat_priv->nc.max_fwd_delay);
+	if (!file)
+		goto out;
+
+	file = debugfs_create_u32("max_buffer_time", S_IRUGO | S_IWUSR, nc_dir,
+				  &bat_priv->nc.max_buffer_time);
+	if (!file)
+		goto out;
+
+	return 0;
+
+out:
+	return -ENOMEM;
+}
diff --git a/net/batman-adv/network-coding.h b/net/batman-adv/network-coding.h
new file mode 100644
index 0000000..4fa6d0c
--- /dev/null
+++ b/net/batman-adv/network-coding.h
@@ -0,0 +1,123 @@
+/* Copyright (C) 2012-2013 B.A.T.M.A.N. contributors:
+ *
+ * Martin Hundebøll, Jeppe Ledet-Pedersen
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef _NET_BATMAN_ADV_NETWORK_CODING_H_
+#define _NET_BATMAN_ADV_NETWORK_CODING_H_
+
+#ifdef CONFIG_BATMAN_ADV_NC
+
+int batadv_nc_init(struct batadv_priv *bat_priv);
+void batadv_nc_free(struct batadv_priv *bat_priv);
+void batadv_nc_update_nc_node(struct batadv_priv *bat_priv,
+			      struct batadv_orig_node *orig_node,
+			      struct batadv_orig_node *orig_neigh_node,
+			      struct batadv_ogm_packet *ogm_packet,
+			      int is_single_hop_neigh);
+void batadv_nc_purge_orig(struct batadv_priv *bat_priv,
+			  struct batadv_orig_node *orig_node,
+			  bool (*to_purge)(struct batadv_priv *,
+					   struct batadv_nc_node *));
+void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv);
+void batadv_nc_init_orig(struct batadv_orig_node *orig_node);
+bool batadv_nc_skb_forward(struct sk_buff *skb,
+			   struct batadv_neigh_node *neigh_node,
+			   struct ethhdr *ethhdr);
+void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv,
+				      struct sk_buff *skb);
+void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv,
+					 struct sk_buff *skb);
+int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset);
+int batadv_nc_init_debugfs(struct batadv_priv *bat_priv);
+
+#else /* ifdef CONFIG_BATMAN_ADV_NC */
+
+static inline int batadv_nc_init(struct batadv_priv *bat_priv)
+{
+	return 0;
+}
+
+static inline void batadv_nc_free(struct batadv_priv *bat_priv)
+{
+	return;
+}
+
+static inline void
+batadv_nc_update_nc_node(struct batadv_priv *bat_priv,
+			 struct batadv_orig_node *orig_node,
+			 struct batadv_orig_node *orig_neigh_node,
+			 struct batadv_ogm_packet *ogm_packet,
+			 int is_single_hop_neigh)
+{
+	return;
+}
+
+static inline void
+batadv_nc_purge_orig(struct batadv_priv *bat_priv,
+		     struct batadv_orig_node *orig_node,
+		     bool (*to_purge)(struct batadv_priv *,
+				      struct batadv_nc_node *))
+{
+	return;
+}
+
+static inline void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv)
+{
+	return;
+}
+
+static inline void batadv_nc_init_orig(struct batadv_orig_node *orig_node)
+{
+	return;
+}
+
+static inline bool batadv_nc_skb_forward(struct sk_buff *skb,
+					 struct batadv_neigh_node *neigh_node,
+					 struct ethhdr *ethhdr)
+{
+	return false;
+}
+
+static inline void
+batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv,
+				 struct sk_buff *skb)
+{
+	return;
+}
+
+static inline void
+batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv,
+				    struct sk_buff *skb)
+{
+	return;
+}
+
+static inline int batadv_nc_nodes_seq_print_text(struct seq_file *seq,
+						 void *offset)
+{
+	return 0;
+}
+
+static inline int batadv_nc_init_debugfs(struct batadv_priv *bat_priv)
+{
+	return 0;
+}
+
+#endif /* ifdef CONFIG_BATMAN_ADV_NC */
+
+#endif /* _NET_BATMAN_ADV_NETWORK_CODING_H_ */
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 96fb80b..2f34525 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -28,6 +28,7 @@
 #include "unicast.h"
 #include "soft-interface.h"
 #include "bridge_loop_avoidance.h"
+#include "network-coding.h"
 
 /* hash class keys */
 static struct lock_class_key batadv_orig_hash_lock_class_key;
@@ -142,6 +143,9 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 
 	spin_unlock_bh(&orig_node->neigh_list_lock);
 
+	/* Free nc_nodes */
+	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
+
 	batadv_frag_list_free(&orig_node->frag_list);
 	batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 				  "originator timed out");
@@ -219,6 +223,8 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 	spin_lock_init(&orig_node->neigh_list_lock);
 	spin_lock_init(&orig_node->tt_buff_lock);
 
+	batadv_nc_init_orig(orig_node);
+
 	/* extra reference for return */
 	atomic_set(&orig_node->refcount, 2);
 
@@ -459,7 +465,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 					   neigh_node_tmp->tq_avg);
 			}
 
-			seq_printf(seq, "\n");
+			seq_puts(seq, "\n");
 			batman_count++;
 
 next:
@@ -469,7 +475,7 @@ next:
 	}
 
 	if (batman_count == 0)
-		seq_printf(seq, "No batman nodes in range ...\n");
+		seq_puts(seq, "No batman nodes in range ...\n");
 
 out:
 	if (primary_if)
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index ed0aa89..a51ccfc 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -30,6 +30,7 @@ enum batadv_packettype {
 	BATADV_TT_QUERY		= 0x07,
 	BATADV_ROAM_ADV		= 0x08,
 	BATADV_UNICAST_4ADDR	= 0x09,
+	BATADV_CODED		= 0x0a,
 };
 
 /**
@@ -278,4 +279,36 @@ struct batadv_tt_change {
 	uint8_t addr[ETH_ALEN];
 } __packed;
 
+/**
+ * struct batadv_coded_packet - network coded packet
+ * @header: common batman packet header and ttl of first included packet
+ * @reserved: Align following fields to 2-byte boundaries
+ * @first_source: original source of first included packet
+ * @first_orig_dest: original destinal of first included packet
+ * @first_crc: checksum of first included packet
+ * @first_ttvn: tt-version number of first included packet
+ * @second_ttl: ttl of second packet
+ * @second_dest: second receiver of this coded packet
+ * @second_source: original source of second included packet
+ * @second_orig_dest: original destination of second included packet
+ * @second_crc: checksum of second included packet
+ * @second_ttvn: tt version number of second included packet
+ * @coded_len: length of network coded part of the payload
+ */
+struct batadv_coded_packet {
+	struct batadv_header header;
+	uint8_t  first_ttvn;
+	/* uint8_t  first_dest[ETH_ALEN]; - saved in mac header destination */
+	uint8_t  first_source[ETH_ALEN];
+	uint8_t  first_orig_dest[ETH_ALEN];
+	__be32   first_crc;
+	uint8_t  second_ttl;
+	uint8_t  second_ttvn;
+	uint8_t  second_dest[ETH_ALEN];
+	uint8_t  second_source[ETH_ALEN];
+	uint8_t  second_orig_dest[ETH_ALEN];
+	__be32   second_crc;
+	__be16   coded_len;
+};
+
 #endif /* _NET_BATMAN_ADV_PACKET_H_ */
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 319f290..b27a4d7 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -29,6 +29,7 @@
 #include "unicast.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
+#include "network-coding.h"
 
 static int batadv_route_unicast_packet(struct sk_buff *skb,
 				       struct batadv_hard_iface *recv_if);
@@ -548,6 +549,17 @@ batadv_find_ifalter_router(struct batadv_orig_node *primary_orig,
 	return router;
 }
 
+/**
+ * batadv_check_unicast_packet - Check for malformed unicast packets
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: packet to check
+ * @hdr_size: size of header to pull
+ *
+ * Check for short header and bad addresses in given packet. Returns negative
+ * value when check fails and 0 otherwise. The negative value depends on the
+ * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
+ * and -EREMOTE for non-local (other host) destination.
+ */
 static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
 				       struct sk_buff *skb, int hdr_size)
 {
@@ -555,21 +567,21 @@ static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
 
 	/* drop packet if it has not necessary minimum size */
 	if (unlikely(!pskb_may_pull(skb, hdr_size)))
-		return -1;
+		return -ENODATA;
 
 	ethhdr = (struct ethhdr *)skb_mac_header(skb);
 
 	/* packet with unicast indication but broadcast recipient */
 	if (is_broadcast_ether_addr(ethhdr->h_dest))
-		return -1;
+		return -EBADR;
 
 	/* packet with broadcast sender address */
 	if (is_broadcast_ether_addr(ethhdr->h_source))
-		return -1;
+		return -EBADR;
 
 	/* not for me */
 	if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
-		return -1;
+		return -EREMOTE;
 
 	return 0;
 }
@@ -852,15 +864,18 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	/* decrement ttl */
 	unicast_packet->header.ttl--;
 
-	/* Update stats counter */
-	batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
-	batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
-			   skb->len + ETH_HLEN);
-
-	/* route it */
-	if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
+	/* network code packet if possible */
+	if (batadv_nc_skb_forward(skb, neigh_node, ethhdr)) {
+		ret = NET_RX_SUCCESS;
+	} else if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) {
 		ret = NET_RX_SUCCESS;
 
+		/* Update stats counter */
+		batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
+		batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
+				   skb->len + ETH_HLEN);
+	}
+
 out:
 	if (neigh_node)
 		batadv_neigh_node_free_ref(neigh_node);
@@ -924,7 +939,7 @@ out:
 }
 
 static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
-				     struct sk_buff *skb) {
+				     struct sk_buff *skb, int hdr_len) {
 	uint8_t curr_ttvn, old_ttvn;
 	struct batadv_orig_node *orig_node;
 	struct ethhdr *ethhdr;
@@ -933,7 +948,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 	int is_old_ttvn;
 
 	/* check if there is enough data before accessing it */
-	if (pskb_may_pull(skb, sizeof(*unicast_packet) + ETH_HLEN) < 0)
+	if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0)
 		return 0;
 
 	/* create a copy of the skb (in case of for re-routing) to modify it. */
@@ -941,7 +956,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 		return 0;
 
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	ethhdr = (struct ethhdr *)(skb->data + sizeof(*unicast_packet));
+	ethhdr = (struct ethhdr *)(skb->data + hdr_len);
 
 	/* check if the destination client was served by this node and it is now
 	 * roaming. In this case, it means that the node has got a ROAM_ADV
@@ -1035,7 +1050,7 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
 	struct batadv_unicast_4addr_packet *unicast_4addr_packet;
 	uint8_t *orig_addr;
 	struct batadv_orig_node *orig_node = NULL;
-	int hdr_size = sizeof(*unicast_packet);
+	int check, hdr_size = sizeof(*unicast_packet);
 	bool is4addr;
 
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
@@ -1046,10 +1061,18 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
 	if (is4addr)
 		hdr_size = sizeof(*unicast_4addr_packet);
 
-	if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
-		return NET_RX_DROP;
+	/* function returns -EREMOTE for promiscuous packets */
+	check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
+
+	/* Even though the packet is not for us, we might save it to use for
+	 * decoding a later received coded packet
+	 */
+	if (check == -EREMOTE)
+		batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
 
-	if (!batadv_check_unicast_ttvn(bat_priv, skb))
+	if (check < 0)
+		return NET_RX_DROP;
+	if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
 		return NET_RX_DROP;
 
 	/* packet for me */
@@ -1093,7 +1116,7 @@ int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
 	if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
 		return NET_RX_DROP;
 
-	if (!batadv_check_unicast_ttvn(bat_priv, skb))
+	if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
 		return NET_RX_DROP;
 
 	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index a67cffd..263cfd1 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -27,6 +27,7 @@
 #include "vis.h"
 #include "gateway_common.h"
 #include "originator.h"
+#include "network-coding.h"
 
 #include <linux/if_ether.h>
 
@@ -39,6 +40,7 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 			   struct batadv_hard_iface *hard_iface,
 			   const uint8_t *dst_addr)
 {
+	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 	struct ethhdr *ethhdr;
 
 	if (hard_iface->if_status != BATADV_IF_ACTIVE)
@@ -70,6 +72,9 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 
 	skb->dev = hard_iface->net_dev;
 
+	/* Save a clone of the skb to use when decoding coded packets */
+	batadv_nc_skb_store_for_decoding(bat_priv, skb);
+
 	/* dev_queue_xmit() returns a negative result on error.	 However on
 	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 	 * (which is > 0). This will not be treated as an error.
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 2711e87..6f20d33 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -37,6 +37,7 @@
 #include <linux/if_ether.h>
 #include "unicast.h"
 #include "bridge_loop_avoidance.h"
+#include "network-coding.h"
 
 
 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
@@ -401,55 +402,6 @@ static void batadv_set_lockdep_class(struct net_device *dev)
 }
 
 /**
- * batadv_softif_init - Late stage initialization of soft interface
- * @dev: registered network device to modify
- *
- * Returns error code on failures
- */
-static int batadv_softif_init(struct net_device *dev)
-{
-	batadv_set_lockdep_class(dev);
-
-	return 0;
-}
-
-static const struct net_device_ops batadv_netdev_ops = {
-	.ndo_init = batadv_softif_init,
-	.ndo_open = batadv_interface_open,
-	.ndo_stop = batadv_interface_release,
-	.ndo_get_stats = batadv_interface_stats,
-	.ndo_set_mac_address = batadv_interface_set_mac_addr,
-	.ndo_change_mtu = batadv_interface_change_mtu,
-	.ndo_start_xmit = batadv_interface_tx,
-	.ndo_validate_addr = eth_validate_addr
-};
-
-static void batadv_interface_setup(struct net_device *dev)
-{
-	struct batadv_priv *priv = netdev_priv(dev);
-
-	ether_setup(dev);
-
-	dev->netdev_ops = &batadv_netdev_ops;
-	dev->destructor = free_netdev;
-	dev->tx_queue_len = 0;
-
-	/* can't call min_mtu, because the needed variables
-	 * have not been initialized yet
-	 */
-	dev->mtu = ETH_DATA_LEN;
-	/* reserve more space in the skbuff for our header */
-	dev->hard_header_len = BATADV_HEADER_LEN;
-
-	/* generate random address */
-	eth_hw_addr_random(dev);
-
-	SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
-
-	memset(priv, 0, sizeof(*priv));
-}
-
-/**
  * batadv_softif_destroy_finish - cleans up the remains of a softif
  * @work: work queue item
  *
@@ -465,7 +417,6 @@ static void batadv_softif_destroy_finish(struct work_struct *work)
 				cleanup_work);
 	soft_iface = bat_priv->soft_iface;
 
-	batadv_debugfs_del_meshif(soft_iface);
 	batadv_sysfs_del_meshif(soft_iface);
 
 	rtnl_lock();
@@ -473,21 +424,22 @@ static void batadv_softif_destroy_finish(struct work_struct *work)
 	rtnl_unlock();
 }
 
-struct net_device *batadv_softif_create(const char *name)
+/**
+ * batadv_softif_init_late - late stage initialization of soft interface
+ * @dev: registered network device to modify
+ *
+ * Returns error code on failures
+ */
+static int batadv_softif_init_late(struct net_device *dev)
 {
-	struct net_device *soft_iface;
 	struct batadv_priv *bat_priv;
 	int ret;
 	size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 
-	soft_iface = alloc_netdev(sizeof(*bat_priv), name,
-				  batadv_interface_setup);
-
-	if (!soft_iface)
-		goto out;
+	batadv_set_lockdep_class(dev);
 
-	bat_priv = netdev_priv(soft_iface);
-	bat_priv->soft_iface = soft_iface;
+	bat_priv = netdev_priv(dev);
+	bat_priv->soft_iface = dev;
 	INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 
 	/* batadv_interface_stats() needs to be available as soon as
@@ -495,14 +447,7 @@ struct net_device *batadv_softif_create(const char *name)
 	 */
 	bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
 	if (!bat_priv->bat_counters)
-		goto free_soft_iface;
-
-	ret = register_netdevice(soft_iface);
-	if (ret < 0) {
-		pr_err("Unable to register the batman interface '%s': %i\n",
-		       name, ret);
-		goto free_bat_counters;
-	}
+		return -ENOMEM;
 
 	atomic_set(&bat_priv->aggregated_ogms, 1);
 	atomic_set(&bat_priv->bonding, 0);
@@ -540,49 +485,196 @@ struct net_device *batadv_softif_create(const char *name)
 	bat_priv->primary_if = NULL;
 	bat_priv->num_ifaces = 0;
 
-	ret = batadv_algo_select(bat_priv, batadv_routing_algo);
-	if (ret < 0)
-		goto unreg_soft_iface;
+	batadv_nc_init_bat_priv(bat_priv);
 
-	ret = batadv_sysfs_add_meshif(soft_iface);
+	ret = batadv_algo_select(bat_priv, batadv_routing_algo);
 	if (ret < 0)
-		goto unreg_soft_iface;
+		goto free_bat_counters;
 
-	ret = batadv_debugfs_add_meshif(soft_iface);
+	ret = batadv_debugfs_add_meshif(dev);
 	if (ret < 0)
-		goto unreg_sysfs;
+		goto free_bat_counters;
 
-	ret = batadv_mesh_init(soft_iface);
+	ret = batadv_mesh_init(dev);
 	if (ret < 0)
 		goto unreg_debugfs;
 
-	return soft_iface;
+	return 0;
 
 unreg_debugfs:
-	batadv_debugfs_del_meshif(soft_iface);
-unreg_sysfs:
-	batadv_sysfs_del_meshif(soft_iface);
-unreg_soft_iface:
-	free_percpu(bat_priv->bat_counters);
-	unregister_netdevice(soft_iface);
-	return NULL;
-
+	batadv_debugfs_del_meshif(dev);
 free_bat_counters:
 	free_percpu(bat_priv->bat_counters);
-free_soft_iface:
-	free_netdev(soft_iface);
+
+	return ret;
+}
+
+/**
+ * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface
+ * @dev: batadv_soft_interface used as master interface
+ * @slave_dev: net_device which should become the slave interface
+ *
+ * Return 0 if successful or error otherwise.
+ */
+static int batadv_softif_slave_add(struct net_device *dev,
+				   struct net_device *slave_dev)
+{
+	struct batadv_hard_iface *hard_iface;
+	int ret = -EINVAL;
+
+	hard_iface = batadv_hardif_get_by_netdev(slave_dev);
+	if (!hard_iface || hard_iface->soft_iface != NULL)
+		goto out;
+
+	ret = batadv_hardif_enable_interface(hard_iface, dev->name);
+
 out:
-	return NULL;
+	if (hard_iface)
+		batadv_hardif_free_ref(hard_iface);
+	return ret;
 }
 
-void batadv_softif_destroy(struct net_device *soft_iface)
+/**
+ * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface
+ * @dev: batadv_soft_interface used as master interface
+ * @slave_dev: net_device which should be removed from the master interface
+ *
+ * Return 0 if successful or error otherwise.
+ */
+static int batadv_softif_slave_del(struct net_device *dev,
+				   struct net_device *slave_dev)
+{
+	struct batadv_hard_iface *hard_iface;
+	int ret = -EINVAL;
+
+	hard_iface = batadv_hardif_get_by_netdev(slave_dev);
+
+	if (!hard_iface || hard_iface->soft_iface != dev)
+		goto out;
+
+	batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP);
+	ret = 0;
+
+out:
+	if (hard_iface)
+		batadv_hardif_free_ref(hard_iface);
+	return ret;
+}
+
+static const struct net_device_ops batadv_netdev_ops = {
+	.ndo_init = batadv_softif_init_late,
+	.ndo_open = batadv_interface_open,
+	.ndo_stop = batadv_interface_release,
+	.ndo_get_stats = batadv_interface_stats,
+	.ndo_set_mac_address = batadv_interface_set_mac_addr,
+	.ndo_change_mtu = batadv_interface_change_mtu,
+	.ndo_start_xmit = batadv_interface_tx,
+	.ndo_validate_addr = eth_validate_addr,
+	.ndo_add_slave = batadv_softif_slave_add,
+	.ndo_del_slave = batadv_softif_slave_del,
+};
+
+/**
+ * batadv_softif_free - Deconstructor of batadv_soft_interface
+ * @dev: Device to cleanup and remove
+ */
+static void batadv_softif_free(struct net_device *dev)
+{
+	batadv_debugfs_del_meshif(dev);
+	batadv_mesh_free(dev);
+
+	/* some scheduled RCU callbacks need the bat_priv struct to accomplish
+	 * their tasks. Wait for them all to be finished before freeing the
+	 * netdev and its private data (bat_priv)
+	 */
+	rcu_barrier();
+
+	free_netdev(dev);
+}
+
+/**
+ * batadv_softif_init_early - early stage initialization of soft interface
+ * @dev: registered network device to modify
+ */
+static void batadv_softif_init_early(struct net_device *dev)
+{
+	struct batadv_priv *priv = netdev_priv(dev);
+
+	ether_setup(dev);
+
+	dev->netdev_ops = &batadv_netdev_ops;
+	dev->destructor = batadv_softif_free;
+	dev->tx_queue_len = 0;
+
+	/* can't call min_mtu, because the needed variables
+	 * have not been initialized yet
+	 */
+	dev->mtu = ETH_DATA_LEN;
+	/* reserve more space in the skbuff for our header */
+	dev->hard_header_len = BATADV_HEADER_LEN;
+
+	/* generate random address */
+	eth_hw_addr_random(dev);
+
+	SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
+
+	memset(priv, 0, sizeof(*priv));
+}
+
+struct net_device *batadv_softif_create(const char *name)
+{
+	struct net_device *soft_iface;
+	int ret;
+
+	soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
+				  batadv_softif_init_early);
+	if (!soft_iface)
+		return NULL;
+
+	soft_iface->rtnl_link_ops = &batadv_link_ops;
+
+	ret = register_netdevice(soft_iface);
+	if (ret < 0) {
+		pr_err("Unable to register the batman interface '%s': %i\n",
+		       name, ret);
+		free_netdev(soft_iface);
+		return NULL;
+	}
+
+	return soft_iface;
+}
+
+/**
+ * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs
+ * @soft_iface: the to-be-removed batman-adv interface
+ */
+void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 
-	batadv_mesh_free(soft_iface);
 	queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
 }
 
+/**
+ * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
+ * @soft_iface: the to-be-removed batman-adv interface
+ * @head: list pointer
+ */
+static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
+					  struct list_head *head)
+{
+	struct batadv_hard_iface *hard_iface;
+
+	list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
+		if (hard_iface->soft_iface == soft_iface)
+			batadv_hardif_disable_interface(hard_iface,
+							BATADV_IF_CLEANUP_KEEP);
+	}
+
+	batadv_sysfs_del_meshif(soft_iface);
+	unregister_netdevice_queue(soft_iface, head);
+}
+
 int batadv_softif_is_valid(const struct net_device *net_dev)
 {
 	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
@@ -591,6 +683,13 @@ int batadv_softif_is_valid(const struct net_device *net_dev)
 	return 0;
 }
 
+struct rtnl_link_ops batadv_link_ops __read_mostly = {
+	.kind		= "batadv",
+	.priv_size	= sizeof(struct batadv_priv),
+	.setup		= batadv_softif_init_early,
+	.dellink	= batadv_softif_destroy_netlink,
+};
+
 /* ethtool */
 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 {
@@ -662,6 +761,17 @@ static const struct {
 	{ "dat_put_rx" },
 	{ "dat_cached_reply_tx" },
 #endif
+#ifdef CONFIG_BATMAN_ADV_NC
+	{ "nc_code" },
+	{ "nc_code_bytes" },
+	{ "nc_recode" },
+	{ "nc_recode_bytes" },
+	{ "nc_buffer" },
+	{ "nc_decode" },
+	{ "nc_decode_bytes" },
+	{ "nc_decode_failed" },
+	{ "nc_sniffed" },
+#endif
 };
 
 static void batadv_get_strings(struct net_device *dev, uint32_t stringset,
diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h
index 43182e5..2f2472c 100644
--- a/net/batman-adv/soft-interface.h
+++ b/net/batman-adv/soft-interface.h
@@ -25,7 +25,8 @@ 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);
-void batadv_softif_destroy(struct net_device *soft_iface);
+void batadv_softif_destroy_sysfs(struct net_device *soft_iface);
 int batadv_softif_is_valid(const struct net_device *net_dev);
+extern struct rtnl_link_ops batadv_link_ops;
 
 #endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c
index afbba31..15a22ef 100644
--- a/net/batman-adv/sysfs.c
+++ b/net/batman-adv/sysfs.c
@@ -442,6 +442,9 @@ static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 #ifdef CONFIG_BATMAN_ADV_DEBUG
 BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL);
 #endif
+#ifdef CONFIG_BATMAN_ADV_NC
+BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR, NULL);
+#endif
 
 static struct batadv_attribute *batadv_mesh_attrs[] = {
 	&batadv_attr_aggregated_ogms,
@@ -464,6 +467,9 @@ static struct batadv_attribute *batadv_mesh_attrs[] = {
 #ifdef CONFIG_BATMAN_ADV_DEBUG
 	&batadv_attr_log_level,
 #endif
+#ifdef CONFIG_BATMAN_ADV_NC
+	&batadv_attr_network_coding,
+#endif
 	NULL,
 };
 
@@ -582,13 +588,15 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 	}
 
 	if (status_tmp == BATADV_IF_NOT_IN_USE) {
-		batadv_hardif_disable_interface(hard_iface);
+		batadv_hardif_disable_interface(hard_iface,
+						BATADV_IF_CLEANUP_AUTO);
 		goto unlock;
 	}
 
 	/* if the interface already is in use */
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
-		batadv_hardif_disable_interface(hard_iface);
+		batadv_hardif_disable_interface(hard_iface,
+						BATADV_IF_CLEANUP_AUTO);
 
 	ret = batadv_hardif_enable_interface(hard_iface, buff);
 
@@ -688,15 +696,10 @@ int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
 			enum batadv_uev_action action, const char *data)
 {
 	int ret = -ENOMEM;
-	struct batadv_hard_iface *primary_if;
 	struct kobject *bat_kobj;
 	char *uevent_env[4] = { NULL, NULL, NULL, NULL };
 
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto out;
-
-	bat_kobj = &primary_if->soft_iface->dev.kobj;
+	bat_kobj = &bat_priv->soft_iface->dev.kobj;
 
 	uevent_env[0] = kmalloc(strlen(BATADV_UEV_TYPE_VAR) +
 				strlen(batadv_uev_type_str[type]) + 1,
@@ -732,9 +735,6 @@ out:
 	kfree(uevent_env[1]);
 	kfree(uevent_env[2]);
 
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
-
 	if (ret)
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 7abee19..5e89dee 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -385,25 +385,19 @@ static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
 					  int *packet_buff_len,
 					  int min_packet_len)
 {
-	struct batadv_hard_iface *primary_if;
 	int req_len;
 
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-
 	req_len = min_packet_len;
 	req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
 
 	/* if we have too many changes for one packet don't send any
 	 * and wait for the tt table request which will be fragmented
 	 */
-	if ((!primary_if) || (req_len > primary_if->soft_iface->mtu))
+	if (req_len > bat_priv->soft_iface->mtu)
 		req_len = min_packet_len;
 
 	batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
 				      min_packet_len, req_len);
-
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
 }
 
 static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
@@ -908,7 +902,7 @@ out_remove:
 	/* remove address from local hash if present */
 	local_flags = batadv_tt_local_remove(bat_priv, tt_addr,
 					     "global tt received",
-					     !!(flags & BATADV_TT_CLIENT_ROAM));
+					     flags & BATADV_TT_CLIENT_ROAM);
 	tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
 
 	if (!(flags & BATADV_TT_CLIENT_ROAM))
@@ -1580,7 +1574,7 @@ static int batadv_tt_global_valid(const void *entry_ptr,
 static struct sk_buff *
 batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
 			      struct batadv_hashtable *hash,
-			      struct batadv_hard_iface *primary_if,
+			      struct batadv_priv *bat_priv,
 			      int (*valid_cb)(const void *, const void *),
 			      void *cb_data)
 {
@@ -1594,8 +1588,8 @@ batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
 	uint32_t i;
 	size_t len;
 
-	if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
-		tt_len = primary_if->soft_iface->mtu - tt_query_size;
+	if (tt_query_size + tt_len > bat_priv->soft_iface->mtu) {
+		tt_len = bat_priv->soft_iface->mtu - tt_query_size;
 		tt_len -= tt_len % sizeof(struct batadv_tt_change);
 	}
 	tt_tot = tt_len / sizeof(struct batadv_tt_change);
@@ -1715,7 +1709,6 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 {
 	struct batadv_orig_node *req_dst_orig_node;
 	struct batadv_orig_node *res_dst_orig_node = NULL;
-	struct batadv_hard_iface *primary_if = NULL;
 	uint8_t orig_ttvn, req_ttvn, ttvn;
 	int ret = false;
 	unsigned char *tt_buff;
@@ -1740,10 +1733,6 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 	if (!res_dst_orig_node)
 		goto out;
 
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto out;
-
 	orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
 	req_ttvn = tt_request->ttvn;
 
@@ -1791,7 +1780,7 @@ batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 
 		skb = batadv_tt_response_fill_table(tt_len, ttvn,
 						    bat_priv->tt.global_hash,
-						    primary_if,
+						    bat_priv,
 						    batadv_tt_global_valid,
 						    req_dst_orig_node);
 		if (!skb)
@@ -1828,8 +1817,6 @@ out:
 		batadv_orig_node_free_ref(res_dst_orig_node);
 	if (req_dst_orig_node)
 		batadv_orig_node_free_ref(req_dst_orig_node);
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
 	if (!ret)
 		kfree_skb(skb);
 	return ret;
@@ -1907,7 +1894,7 @@ batadv_send_my_tt_response(struct batadv_priv *bat_priv,
 
 		skb = batadv_tt_response_fill_table(tt_len, ttvn,
 						    bat_priv->tt.local_hash,
-						    primary_if,
+						    bat_priv,
 						    batadv_tt_local_valid_entry,
 						    NULL);
 		if (!skb)
@@ -2528,7 +2515,7 @@ bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
 	if (!tt_global_entry)
 		goto out;
 
-	ret = !!(tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM);
+	ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
 	batadv_tt_global_entry_free_ref(tt_global_entry);
 out:
 	return ret;
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 4cd87a0..aba8364 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -128,6 +128,10 @@ struct batadv_hard_iface {
  * @bond_list: list of bonding candidates
  * @refcount: number of contexts the object is used
  * @rcu: struct used for freeing in an RCU-safe manner
+ * @in_coding_list: list of nodes this orig can hear
+ * @out_coding_list: list of nodes that can hear this orig
+ * @in_coding_list_lock: protects in_coding_list
+ * @out_coding_list_lock: protects out_coding_list
  */
 struct batadv_orig_node {
 	uint8_t orig[ETH_ALEN];
@@ -171,6 +175,12 @@ struct batadv_orig_node {
 	struct list_head bond_list;
 	atomic_t refcount;
 	struct rcu_head rcu;
+#ifdef CONFIG_BATMAN_ADV_NC
+	struct list_head in_coding_list;
+	struct list_head out_coding_list;
+	spinlock_t in_coding_list_lock; /* Protects in_coding_list */
+	spinlock_t out_coding_list_lock; /* Protects out_coding_list */
+#endif
 };
 
 /**
@@ -265,6 +275,17 @@ struct batadv_bcast_duplist_entry {
  * @BATADV_CNT_DAT_PUT_RX: received dht PUT traffic packet counter
  * @BATADV_CNT_DAT_CACHED_REPLY_TX: transmitted dat cache reply traffic packet
  *  counter
+ * @BATADV_CNT_NC_CODE: transmitted nc-combined traffic packet counter
+ * @BATADV_CNT_NC_CODE_BYTES: transmitted nc-combined traffic bytes counter
+ * @BATADV_CNT_NC_RECODE: transmitted nc-recombined traffic packet counter
+ * @BATADV_CNT_NC_RECODE_BYTES: transmitted nc-recombined traffic bytes counter
+ * @BATADV_CNT_NC_BUFFER: counter for packets buffered for later nc decoding
+ * @BATADV_CNT_NC_DECODE: received and nc-decoded traffic packet counter
+ * @BATADV_CNT_NC_DECODE_BYTES: received and nc-decoded traffic bytes counter
+ * @BATADV_CNT_NC_DECODE_FAILED: received and decode-failed traffic packet
+ *  counter
+ * @BATADV_CNT_NC_SNIFFED: counter for nc-decoded packets received in promisc
+ *  mode.
  * @BATADV_CNT_NUM: number of traffic counters
  */
 enum batadv_counters {
@@ -292,6 +313,17 @@ enum batadv_counters {
 	BATADV_CNT_DAT_PUT_RX,
 	BATADV_CNT_DAT_CACHED_REPLY_TX,
 #endif
+#ifdef CONFIG_BATMAN_ADV_NC
+	BATADV_CNT_NC_CODE,
+	BATADV_CNT_NC_CODE_BYTES,
+	BATADV_CNT_NC_RECODE,
+	BATADV_CNT_NC_RECODE_BYTES,
+	BATADV_CNT_NC_BUFFER,
+	BATADV_CNT_NC_DECODE,
+	BATADV_CNT_NC_DECODE_BYTES,
+	BATADV_CNT_NC_DECODE_FAILED,
+	BATADV_CNT_NC_SNIFFED,
+#endif
 	BATADV_CNT_NUM,
 };
 
@@ -428,6 +460,35 @@ struct batadv_priv_dat {
 #endif
 
 /**
+ * struct batadv_priv_nc - per mesh interface network coding private data
+ * @work: work queue callback item for cleanup
+ * @debug_dir: dentry for nc subdir in batman-adv directory in debugfs
+ * @min_tq: only consider neighbors for encoding if neigh_tq > min_tq
+ * @max_fwd_delay: maximum packet forward delay to allow coding of packets
+ * @max_buffer_time: buffer time for sniffed packets used to decoding
+ * @timestamp_fwd_flush: timestamp of last forward packet queue flush
+ * @timestamp_sniffed_purge: timestamp of last sniffed packet queue purge
+ * @coding_hash: Hash table used to buffer skbs while waiting for another
+ *  incoming skb to code it with. Skbs are added to the buffer just before being
+ *  forwarded in routing.c
+ * @decoding_hash: Hash table used to buffer skbs that might be needed to decode
+ *  a received coded skb. The buffer is used for 1) skbs arriving on the
+ *  soft-interface; 2) skbs overheard on the hard-interface; and 3) skbs
+ *  forwarded by batman-adv.
+ */
+struct batadv_priv_nc {
+	struct delayed_work work;
+	struct dentry *debug_dir;
+	u8 min_tq;
+	u32 max_fwd_delay;
+	u32 max_buffer_time;
+	unsigned long timestamp_fwd_flush;
+	unsigned long timestamp_sniffed_purge;
+	struct batadv_hashtable *coding_hash;
+	struct batadv_hashtable *decoding_hash;
+};
+
+/**
  * struct batadv_priv - per mesh interface data
  * @mesh_state: current status of the mesh (inactive/active/deactivating)
  * @soft_iface: net device which holds this struct as private data
@@ -470,6 +531,8 @@ struct batadv_priv_dat {
  * @tt: translation table data
  * @vis: vis data
  * @dat: distributed arp table data
+ * @network_coding: bool indicating whether network coding is enabled
+ * @batadv_priv_nc: network coding data
  */
 struct batadv_priv {
 	atomic_t mesh_state;
@@ -522,6 +585,10 @@ struct batadv_priv {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	struct batadv_priv_dat dat;
 #endif
+#ifdef CONFIG_BATMAN_ADV_NC
+	atomic_t network_coding;
+	struct batadv_priv_nc nc;
+#endif /* CONFIG_BATMAN_ADV_NC */
 };
 
 /**
@@ -702,6 +769,75 @@ struct batadv_tt_roam_node {
 };
 
 /**
+ * struct batadv_nc_node - network coding node
+ * @list: next and prev pointer for the list handling
+ * @addr: the node's mac address
+ * @refcount: number of contexts the object is used by
+ * @rcu: struct used for freeing in an RCU-safe manner
+ * @orig_node: pointer to corresponding orig node struct
+ * @last_seen: timestamp of last ogm received from this node
+ */
+struct batadv_nc_node {
+	struct list_head list;
+	uint8_t addr[ETH_ALEN];
+	atomic_t refcount;
+	struct rcu_head rcu;
+	struct batadv_orig_node *orig_node;
+	unsigned long last_seen;
+};
+
+/**
+ * struct batadv_nc_path - network coding path
+ * @hash_entry: next and prev pointer for the list handling
+ * @rcu: struct used for freeing in an RCU-safe manner
+ * @refcount: number of contexts the object is used by
+ * @packet_list: list of buffered packets for this path
+ * @packet_list_lock: access lock for packet list
+ * @next_hop: next hop (destination) of path
+ * @prev_hop: previous hop (source) of path
+ * @last_valid: timestamp for last validation of path
+ */
+struct batadv_nc_path {
+	struct hlist_node hash_entry;
+	struct rcu_head rcu;
+	atomic_t refcount;
+	struct list_head packet_list;
+	spinlock_t packet_list_lock; /* Protects packet_list */
+	uint8_t next_hop[ETH_ALEN];
+	uint8_t prev_hop[ETH_ALEN];
+	unsigned long last_valid;
+};
+
+/**
+ * struct batadv_nc_packet - network coding packet used when coding and
+ *  decoding packets
+ * @list: next and prev pointer for the list handling
+ * @packet_id: crc32 checksum of skb data
+ * @timestamp: field containing the info when the packet was added to path
+ * @neigh_node: pointer to original next hop neighbor of skb
+ * @skb: skb which can be encoded or used for decoding
+ * @nc_path: pointer to path this nc packet is attached to
+ */
+struct batadv_nc_packet {
+	struct list_head list;
+	__be32 packet_id;
+	unsigned long timestamp;
+	struct batadv_neigh_node *neigh_node;
+	struct sk_buff *skb;
+	struct batadv_nc_path *nc_path;
+};
+
+/**
+ * batadv_skb_cb - control buffer structure used to store private data relevant
+ *  to batman-adv in the skb->cb buffer in skbs.
+ * @decoded: Marks a skb as decoded, which is checked when searching for coding
+ *  opportunities in network-coding.c
+ */
+struct batadv_skb_cb {
+	bool decoded;
+};
+
+/**
  * struct batadv_forw_packet - structure for bcast packets to be sent/forwarded
  * @list: list node for batadv_socket_client::queue_list
  * @send_time: execution time for delayed_work (packet sending)
diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c
index 50e079f..0bb3b59 100644
--- a/net/batman-adv/unicast.c
+++ b/net/batman-adv/unicast.c
@@ -122,7 +122,7 @@ batadv_frag_search_packet(struct list_head *head,
 {
 	struct batadv_frag_packet_list_entry *tfp;
 	struct batadv_unicast_frag_packet *tmp_up = NULL;
-	int is_head_tmp, is_head;
+	bool is_head_tmp, is_head;
 	uint16_t search_seqno;
 
 	if (up->flags & BATADV_UNI_FRAG_HEAD)
@@ -130,7 +130,7 @@ batadv_frag_search_packet(struct list_head *head,
 	else
 		search_seqno = ntohs(up->seqno)-1;
 
-	is_head = !!(up->flags & BATADV_UNI_FRAG_HEAD);
+	is_head = up->flags & BATADV_UNI_FRAG_HEAD;
 
 	list_for_each_entry(tfp, head, list) {
 		if (!tfp->skb)
@@ -142,7 +142,7 @@ batadv_frag_search_packet(struct list_head *head,
 		tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data;
 
 		if (tfp->seqno == search_seqno) {
-			is_head_tmp = !!(tmp_up->flags & BATADV_UNI_FRAG_HEAD);
+			is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD;
 			if (is_head_tmp != is_head)
 				return tfp;
 			else
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index 6a1e646..1625e57 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -149,7 +149,7 @@ static void batadv_vis_data_read_prim_sec(struct seq_file *seq,
 
 	hlist_for_each_entry(entry, if_list, list) {
 		if (entry->primary)
-			seq_printf(seq, "PRIMARY, ");
+			seq_puts(seq, "PRIMARY, ");
 		else
 			seq_printf(seq,  "SEC %pM, ", entry->addr);
 	}
@@ -207,7 +207,7 @@ static void batadv_vis_data_read_entries(struct seq_file *seq,
 		if (batadv_compare_eth(entry->addr, packet->vis_orig))
 			batadv_vis_data_read_prim_sec(seq, list);
 
-		seq_printf(seq, "\n");
+		seq_puts(seq, "\n");
 	}
 }