Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 708 insertions, 0 deletions

diff --git a/kernel/net/batman-adv/hard-interface.c b/kernel/net/batman-adv/hard-interface.c
new file mode 100644
index 000000000..baf1f9843
--- /dev/null
+++ b/kernel/net/batman-adv/hard-interface.c
@@ -0,0 +1,708 @@
+/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "main.h"
+#include "distributed-arp-table.h"
+#include "hard-interface.h"
+#include "soft-interface.h"
+#include "send.h"
+#include "translation-table.h"
+#include "routing.h"
+#include "sysfs.h"
+#include "debugfs.h"
+#include "originator.h"
+#include "hash.h"
+#include "bridge_loop_avoidance.h"
+#include "gateway_client.h"
+
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+
+void batadv_hardif_free_rcu(struct rcu_head *rcu)
+{
+	struct batadv_hard_iface *hard_iface;
+
+	hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
+	dev_put(hard_iface->net_dev);
+	kfree(hard_iface);
+}
+
+struct batadv_hard_iface *
+batadv_hardif_get_by_netdev(const struct net_device *net_dev)
+{
+	struct batadv_hard_iface *hard_iface;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if (hard_iface->net_dev == net_dev &&
+		    atomic_inc_not_zero(&hard_iface->refcount))
+			goto out;
+	}
+
+	hard_iface = NULL;
+
+out:
+	rcu_read_unlock();
+	return hard_iface;
+}
+
+/**
+ * batadv_is_on_batman_iface - check if a device is a batman iface descendant
+ * @net_dev: the device to check
+ *
+ * If the user creates any virtual device on top of a batman-adv interface, it
+ * is important to prevent this new interface to be used to create a new mesh
+ * network (this behaviour would lead to a batman-over-batman configuration).
+ * This function recursively checks all the fathers of the device passed as
+ * argument looking for a batman-adv soft interface.
+ *
+ * Returns true if the device is descendant of a batman-adv mesh interface (or
+ * if it is a batman-adv interface itself), false otherwise
+ */
+static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
+{
+	struct net_device *parent_dev;
+	bool ret;
+
+	/* check if this is a batman-adv mesh interface */
+	if (batadv_softif_is_valid(net_dev))
+		return true;
+
+	/* no more parents..stop recursion */
+	if (dev_get_iflink(net_dev) == 0 ||
+	    dev_get_iflink(net_dev) == net_dev->ifindex)
+		return false;
+
+	/* recurse over the parent device */
+	parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev));
+	/* if we got a NULL parent_dev there is something broken.. */
+	if (WARN(!parent_dev, "Cannot find parent device"))
+		return false;
+
+	ret = batadv_is_on_batman_iface(parent_dev);
+
+	return ret;
+}
+
+static int batadv_is_valid_iface(const struct net_device *net_dev)
+{
+	if (net_dev->flags & IFF_LOOPBACK)
+		return 0;
+
+	if (net_dev->type != ARPHRD_ETHER)
+		return 0;
+
+	if (net_dev->addr_len != ETH_ALEN)
+		return 0;
+
+	/* no batman over batman */
+	if (batadv_is_on_batman_iface(net_dev))
+		return 0;
+
+	return 1;
+}
+
+/**
+ * batadv_is_wifi_netdev - check if the given net_device struct is a wifi
+ *  interface
+ * @net_device: the device to check
+ *
+ * Returns true if the net device is a 802.11 wireless device, false otherwise.
+ */
+bool batadv_is_wifi_netdev(struct net_device *net_device)
+{
+	if (!net_device)
+		return false;
+
+#ifdef CONFIG_WIRELESS_EXT
+	/* pre-cfg80211 drivers have to implement WEXT, so it is possible to
+	 * check for wireless_handlers != NULL
+	 */
+	if (net_device->wireless_handlers)
+		return true;
+#endif
+
+	/* cfg80211 drivers have to set ieee80211_ptr */
+	if (net_device->ieee80211_ptr)
+		return true;
+
+	return false;
+}
+
+static struct batadv_hard_iface *
+batadv_hardif_get_active(const struct net_device *soft_iface)
+{
+	struct batadv_hard_iface *hard_iface;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if (hard_iface->soft_iface != soft_iface)
+			continue;
+
+		if (hard_iface->if_status == BATADV_IF_ACTIVE &&
+		    atomic_inc_not_zero(&hard_iface->refcount))
+			goto out;
+	}
+
+	hard_iface = NULL;
+
+out:
+	rcu_read_unlock();
+	return hard_iface;
+}
+
+static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
+					  struct batadv_hard_iface *oldif)
+{
+	struct batadv_hard_iface *primary_if;
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if)
+		goto out;
+
+	batadv_dat_init_own_addr(bat_priv, primary_if);
+	batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+}
+
+static void batadv_primary_if_select(struct batadv_priv *bat_priv,
+				     struct batadv_hard_iface *new_hard_iface)
+{
+	struct batadv_hard_iface *curr_hard_iface;
+
+	ASSERT_RTNL();
+
+	if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
+		new_hard_iface = NULL;
+
+	curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
+	rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
+
+	if (!new_hard_iface)
+		goto out;
+
+	bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
+	batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
+
+out:
+	if (curr_hard_iface)
+		batadv_hardif_free_ref(curr_hard_iface);
+}
+
+static bool
+batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
+{
+	if (hard_iface->net_dev->flags & IFF_UP)
+		return true;
+
+	return false;
+}
+
+static void batadv_check_known_mac_addr(const struct net_device *net_dev)
+{
+	const struct batadv_hard_iface *hard_iface;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
+		    (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
+			continue;
+
+		if (hard_iface->net_dev == net_dev)
+			continue;
+
+		if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
+					net_dev->dev_addr))
+			continue;
+
+		pr_warn("The newly added mac address (%pM) already exists on: %s\n",
+			net_dev->dev_addr, hard_iface->net_dev->name);
+		pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
+	}
+	rcu_read_unlock();
+}
+
+int batadv_hardif_min_mtu(struct net_device *soft_iface)
+{
+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+	const struct batadv_hard_iface *hard_iface;
+	int min_mtu = INT_MAX;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
+		    (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
+			continue;
+
+		if (hard_iface->soft_iface != soft_iface)
+			continue;
+
+		min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu);
+	}
+	rcu_read_unlock();
+
+	if (atomic_read(&bat_priv->fragmentation) == 0)
+		goto out;
+
+	/* with fragmentation enabled the maximum size of internally generated
+	 * packets such as translation table exchanges or tvlv containers, etc
+	 * has to be calculated
+	 */
+	min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE);
+	min_mtu -= sizeof(struct batadv_frag_packet);
+	min_mtu *= BATADV_FRAG_MAX_FRAGMENTS;
+
+out:
+	/* report to the other components the maximum amount of bytes that
+	 * batman-adv can send over the wire (without considering the payload
+	 * overhead). For example, this value is used by TT to compute the
+	 * maximum local table table size
+	 */
+	atomic_set(&bat_priv->packet_size_max, min_mtu);
+
+	/* the real soft-interface MTU is computed by removing the payload
+	 * overhead from the maximum amount of bytes that was just computed.
+	 *
+	 * However batman-adv does not support MTUs bigger than ETH_DATA_LEN
+	 */
+	return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN);
+}
+
+/* adjusts the MTU if a new interface with a smaller MTU appeared. */
+void batadv_update_min_mtu(struct net_device *soft_iface)
+{
+	soft_iface->mtu = batadv_hardif_min_mtu(soft_iface);
+
+	/* Check if the local translate table should be cleaned up to match a
+	 * new (and smaller) MTU.
+	 */
+	batadv_tt_local_resize_to_mtu(soft_iface);
+}
+
+static void
+batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
+{
+	struct batadv_priv *bat_priv;
+	struct batadv_hard_iface *primary_if = NULL;
+
+	if (hard_iface->if_status != BATADV_IF_INACTIVE)
+		goto out;
+
+	bat_priv = netdev_priv(hard_iface->soft_iface);
+
+	bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
+	hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
+
+	/* the first active interface becomes our primary interface or
+	 * the next active interface after the old primary interface was removed
+	 */
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if)
+		batadv_primary_if_select(bat_priv, hard_iface);
+
+	batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
+		    hard_iface->net_dev->name);
+
+	batadv_update_min_mtu(hard_iface->soft_iface);
+
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+}
+
+static void
+batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
+{
+	if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
+	    (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
+		return;
+
+	hard_iface->if_status = BATADV_IF_INACTIVE;
+
+	batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
+		    hard_iface->net_dev->name);
+
+	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, *master;
+	__be16 ethertype = htons(ETH_P_BATMAN);
+	int max_header_len = batadv_max_header_len();
+	int ret;
+
+	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
+		goto out;
+
+	if (!atomic_inc_not_zero(&hard_iface->refcount))
+		goto out;
+
+	soft_iface = dev_get_by_name(&init_net, iface_name);
+
+	if (!soft_iface) {
+		soft_iface = batadv_softif_create(iface_name);
+
+		if (!soft_iface) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		/* dev_get_by_name() increases the reference counter for us */
+		dev_hold(soft_iface);
+	}
+
+	if (!batadv_softif_is_valid(soft_iface)) {
+		pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
+		       soft_iface->name);
+		ret = -EINVAL;
+		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_upper;
+
+	hard_iface->if_num = bat_priv->num_ifaces;
+	bat_priv->num_ifaces++;
+	hard_iface->if_status = BATADV_IF_INACTIVE;
+	ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
+	if (ret < 0) {
+		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_upper;
+	}
+
+	hard_iface->batman_adv_ptype.type = ethertype;
+	hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
+	hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
+	dev_add_pack(&hard_iface->batman_adv_ptype);
+
+	batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
+		    hard_iface->net_dev->name);
+
+	if (atomic_read(&bat_priv->fragmentation) &&
+	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
+		batadv_info(hard_iface->soft_iface,
+			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
+			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
+			    ETH_DATA_LEN + max_header_len);
+
+	if (!atomic_read(&bat_priv->fragmentation) &&
+	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
+		batadv_info(hard_iface->soft_iface,
+			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
+			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
+			    ETH_DATA_LEN + max_header_len);
+
+	if (batadv_hardif_is_iface_up(hard_iface))
+		batadv_hardif_activate_interface(hard_iface);
+	else
+		batadv_err(hard_iface->soft_iface,
+			   "Not using interface %s (retrying later): interface not active\n",
+			   hard_iface->net_dev->name);
+
+	/* begin scheduling originator messages on that interface */
+	batadv_schedule_bat_ogm(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,
+				     enum batadv_hard_if_cleanup autodel)
+{
+	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
+	struct batadv_hard_iface *primary_if = NULL;
+
+	if (hard_iface->if_status == BATADV_IF_ACTIVE)
+		batadv_hardif_deactivate_interface(hard_iface);
+
+	if (hard_iface->if_status != BATADV_IF_INACTIVE)
+		goto out;
+
+	batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
+		    hard_iface->net_dev->name);
+	dev_remove_pack(&hard_iface->batman_adv_ptype);
+
+	bat_priv->num_ifaces--;
+	batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (hard_iface == primary_if) {
+		struct batadv_hard_iface *new_if;
+
+		new_if = batadv_hardif_get_active(hard_iface->soft_iface);
+		batadv_primary_if_select(bat_priv, new_if);
+
+		if (new_if)
+			batadv_hardif_free_ref(new_if);
+	}
+
+	bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
+	hard_iface->if_status = BATADV_IF_NOT_IN_USE;
+
+	/* delete all references to this hard_iface */
+	batadv_purge_orig_ref(bat_priv);
+	batadv_purge_outstanding_packets(bat_priv, hard_iface);
+	dev_put(hard_iface->soft_iface);
+
+	/* nobody uses this interface anymore */
+	if (!bat_priv->num_ifaces) {
+		batadv_gw_check_client_stop(bat_priv);
+
+		if (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);
+
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+}
+
+/**
+ * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif
+ * @work: work queue item
+ *
+ * Free the parts of the hard interface which can not be removed under
+ * rtnl lock (to prevent deadlock situations).
+ */
+static void batadv_hardif_remove_interface_finish(struct work_struct *work)
+{
+	struct batadv_hard_iface *hard_iface;
+
+	hard_iface = container_of(work, struct batadv_hard_iface,
+				  cleanup_work);
+
+	batadv_debugfs_del_hardif(hard_iface);
+	batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
+	batadv_hardif_free_ref(hard_iface);
+}
+
+static struct batadv_hard_iface *
+batadv_hardif_add_interface(struct net_device *net_dev)
+{
+	struct batadv_hard_iface *hard_iface;
+	int ret;
+
+	ASSERT_RTNL();
+
+	ret = batadv_is_valid_iface(net_dev);
+	if (ret != 1)
+		goto out;
+
+	dev_hold(net_dev);
+
+	hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC);
+	if (!hard_iface)
+		goto release_dev;
+
+	ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
+	if (ret)
+		goto free_if;
+
+	hard_iface->if_num = -1;
+	hard_iface->net_dev = net_dev;
+	hard_iface->soft_iface = NULL;
+	hard_iface->if_status = BATADV_IF_NOT_IN_USE;
+
+	ret = batadv_debugfs_add_hardif(hard_iface);
+	if (ret)
+		goto free_sysfs;
+
+	INIT_LIST_HEAD(&hard_iface->list);
+	INIT_WORK(&hard_iface->cleanup_work,
+		  batadv_hardif_remove_interface_finish);
+
+	hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
+	if (batadv_is_wifi_netdev(net_dev))
+		hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS;
+
+	/* extra reference for return */
+	atomic_set(&hard_iface->refcount, 2);
+
+	batadv_check_known_mac_addr(hard_iface->net_dev);
+	list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
+
+	return hard_iface;
+
+free_sysfs:
+	batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
+free_if:
+	kfree(hard_iface);
+release_dev:
+	dev_put(net_dev);
+out:
+	return NULL;
+}
+
+static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
+{
+	ASSERT_RTNL();
+
+	/* first deactivate interface */
+	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
+		batadv_hardif_disable_interface(hard_iface,
+						BATADV_IF_CLEANUP_AUTO);
+
+	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
+		return;
+
+	hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
+	queue_work(batadv_event_workqueue, &hard_iface->cleanup_work);
+}
+
+void batadv_hardif_remove_interfaces(void)
+{
+	struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
+
+	rtnl_lock();
+	list_for_each_entry_safe(hard_iface, hard_iface_tmp,
+				 &batadv_hardif_list, list) {
+		list_del_rcu(&hard_iface->list);
+		batadv_hardif_remove_interface(hard_iface);
+	}
+	rtnl_unlock();
+}
+
+static int batadv_hard_if_event(struct notifier_block *this,
+				unsigned long event, void *ptr)
+{
+	struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
+	struct batadv_hard_iface *hard_iface;
+	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);
+		bat_priv = netdev_priv(net_dev);
+		batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);
+		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);
+
+	if (!hard_iface)
+		goto out;
+
+	switch (event) {
+	case NETDEV_UP:
+		batadv_hardif_activate_interface(hard_iface);
+		break;
+	case NETDEV_GOING_DOWN:
+	case NETDEV_DOWN:
+		batadv_hardif_deactivate_interface(hard_iface);
+		break;
+	case NETDEV_UNREGISTER:
+		list_del_rcu(&hard_iface->list);
+
+		batadv_hardif_remove_interface(hard_iface);
+		break;
+	case NETDEV_CHANGEMTU:
+		if (hard_iface->soft_iface)
+			batadv_update_min_mtu(hard_iface->soft_iface);
+		break;
+	case NETDEV_CHANGEADDR:
+		if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
+			goto hardif_put;
+
+		batadv_check_known_mac_addr(hard_iface->net_dev);
+
+		bat_priv = netdev_priv(hard_iface->soft_iface);
+		bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
+
+		primary_if = batadv_primary_if_get_selected(bat_priv);
+		if (!primary_if)
+			goto hardif_put;
+
+		if (hard_iface == primary_if)
+			batadv_primary_if_update_addr(bat_priv, NULL);
+		break;
+	default:
+		break;
+	}
+
+hardif_put:
+	batadv_hardif_free_ref(hard_iface);
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+	return NOTIFY_DONE;
+}
+
+struct notifier_block batadv_hard_if_notifier = {
+	.notifier_call = batadv_hard_if_event,
+};