Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1184 insertions, 0 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
new file mode 100644
index 000000000..1003abb8c
--- /dev/null
+++ b/net/batman-adv/soft-interface.c
@@ -0,0 +1,1184 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2007-2018  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 "soft-interface.h"
+#include "main.h"
+
+#include <linux/atomic.h>
+#include <linux/byteorder/generic.h>
+#include <linux/cache.h>
+#include <linux/compiler.h>
+#include <linux/cpumask.h>
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/gfp.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/lockdep.h>
+#include <linux/netdevice.h>
+#include <linux/percpu.h>
+#include <linux/printk.h>
+#include <linux/random.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/spinlock.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <uapi/linux/batadv_packet.h>
+
+#include "bat_algo.h"
+#include "bridge_loop_avoidance.h"
+#include "debugfs.h"
+#include "distributed-arp-table.h"
+#include "gateway_client.h"
+#include "gateway_common.h"
+#include "hard-interface.h"
+#include "multicast.h"
+#include "network-coding.h"
+#include "originator.h"
+#include "send.h"
+#include "sysfs.h"
+#include "translation-table.h"
+
+/**
+ * batadv_skb_head_push() - Increase header size and move (push) head pointer
+ * @skb: packet buffer which should be modified
+ * @len: number of bytes to add
+ *
+ * Return: 0 on success or negative error number in case of failure
+ */
+int batadv_skb_head_push(struct sk_buff *skb, unsigned int len)
+{
+	int result;
+
+	/* TODO: We must check if we can release all references to non-payload
+	 * data using __skb_header_release in our skbs to allow skb_cow_header
+	 * to work optimally. This means that those skbs are not allowed to read
+	 * or write any data which is before the current position of skb->data
+	 * after that call and thus allow other skbs with the same data buffer
+	 * to write freely in that area.
+	 */
+	result = skb_cow_head(skb, len);
+	if (result < 0)
+		return result;
+
+	skb_push(skb, len);
+	return 0;
+}
+
+static int batadv_interface_open(struct net_device *dev)
+{
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int batadv_interface_release(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+
+/**
+ * batadv_sum_counter() - Sum the cpu-local counters for index 'idx'
+ * @bat_priv: the bat priv with all the soft interface information
+ * @idx: index of counter to sum up
+ *
+ * Return: sum of all cpu-local counters
+ */
+static u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
+{
+	u64 *counters, sum = 0;
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		counters = per_cpu_ptr(bat_priv->bat_counters, cpu);
+		sum += counters[idx];
+	}
+
+	return sum;
+}
+
+static struct net_device_stats *batadv_interface_stats(struct net_device *dev)
+{
+	struct batadv_priv *bat_priv = netdev_priv(dev);
+	struct net_device_stats *stats = &dev->stats;
+
+	stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX);
+	stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES);
+	stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED);
+	stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX);
+	stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES);
+	return stats;
+}
+
+static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
+{
+	struct batadv_priv *bat_priv = netdev_priv(dev);
+	struct batadv_softif_vlan *vlan;
+	struct sockaddr *addr = p;
+	u8 old_addr[ETH_ALEN];
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	ether_addr_copy(old_addr, dev->dev_addr);
+	ether_addr_copy(dev->dev_addr, addr->sa_data);
+
+	/* only modify transtable if it has been initialized before */
+	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+		return 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+		batadv_tt_local_remove(bat_priv, old_addr, vlan->vid,
+				       "mac address changed", false);
+		batadv_tt_local_add(dev, addr->sa_data, vlan->vid,
+				    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
+	}
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/* check ranges */
+	if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+/**
+ * batadv_interface_set_rx_mode() - set the rx mode of a device
+ * @dev: registered network device to modify
+ *
+ * We do not actually need to set any rx filters for the virtual batman
+ * soft interface. However a dummy handler enables a user to set static
+ * multicast listeners for instance.
+ */
+static void batadv_interface_set_rx_mode(struct net_device *dev)
+{
+}
+
+static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
+				       struct net_device *soft_iface)
+{
+	struct ethhdr *ethhdr;
+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_bcast_packet *bcast_packet;
+	static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
+					      0x00, 0x00};
+	static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
+					       0x00, 0x00};
+	enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO;
+	u8 *dst_hint = NULL, chaddr[ETH_ALEN];
+	struct vlan_ethhdr *vhdr;
+	unsigned int header_len = 0;
+	int data_len = skb->len, ret;
+	unsigned long brd_delay = 1;
+	bool do_bcast = false, client_added;
+	unsigned short vid;
+	u32 seqno;
+	int gw_mode;
+	enum batadv_forw_mode forw_mode;
+	struct batadv_orig_node *mcast_single_orig = NULL;
+	int network_offset = ETH_HLEN;
+
+	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
+		goto dropped;
+
+	/* reset control block to avoid left overs from previous users */
+	memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
+
+	netif_trans_update(soft_iface);
+	vid = batadv_get_vid(skb, 0);
+
+	skb_reset_mac_header(skb);
+	ethhdr = eth_hdr(skb);
+
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_8021Q:
+		if (!pskb_may_pull(skb, sizeof(*vhdr)))
+			goto dropped;
+		vhdr = vlan_eth_hdr(skb);
+
+		/* drop batman-in-batman packets to prevent loops */
+		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) {
+			network_offset += VLAN_HLEN;
+			break;
+		}
+
+		/* fall through */
+	case ETH_P_BATMAN:
+		goto dropped;
+	}
+
+	skb_set_network_header(skb, network_offset);
+
+	if (batadv_bla_tx(bat_priv, skb, vid))
+		goto dropped;
+
+	/* skb->data might have been reallocated by batadv_bla_tx() */
+	ethhdr = eth_hdr(skb);
+
+	/* Register the client MAC in the transtable */
+	if (!is_multicast_ether_addr(ethhdr->h_source) &&
+	    !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) {
+		client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source,
+						   vid, skb->skb_iif,
+						   skb->mark);
+		if (!client_added)
+			goto dropped;
+	}
+
+	/* don't accept stp packets. STP does not help in meshes.
+	 * better use the bridge loop avoidance ...
+	 *
+	 * The same goes for ECTP sent at least by some Cisco Switches,
+	 * it might confuse the mesh when used with bridge loop avoidance.
+	 */
+	if (batadv_compare_eth(ethhdr->h_dest, stp_addr))
+		goto dropped;
+
+	if (batadv_compare_eth(ethhdr->h_dest, ectp_addr))
+		goto dropped;
+
+	gw_mode = atomic_read(&bat_priv->gw.mode);
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+		/* if gw mode is off, broadcast every packet */
+		if (gw_mode == BATADV_GW_MODE_OFF) {
+			do_bcast = true;
+			goto send;
+		}
+
+		dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len,
+							chaddr);
+		/* skb->data may have been modified by
+		 * batadv_gw_dhcp_recipient_get()
+		 */
+		ethhdr = eth_hdr(skb);
+		/* if gw_mode is on, broadcast any non-DHCP message.
+		 * All the DHCP packets are going to be sent as unicast
+		 */
+		if (dhcp_rcp == BATADV_DHCP_NO) {
+			do_bcast = true;
+			goto send;
+		}
+
+		if (dhcp_rcp == BATADV_DHCP_TO_CLIENT)
+			dst_hint = chaddr;
+		else if ((gw_mode == BATADV_GW_MODE_SERVER) &&
+			 (dhcp_rcp == BATADV_DHCP_TO_SERVER))
+			/* gateways should not forward any DHCP message if
+			 * directed to a DHCP server
+			 */
+			goto dropped;
+
+send:
+		if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
+			forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
+							   &mcast_single_orig);
+			if (forw_mode == BATADV_FORW_NONE)
+				goto dropped;
+
+			if (forw_mode == BATADV_FORW_SINGLE)
+				do_bcast = false;
+		}
+	}
+
+	batadv_skb_set_priority(skb, 0);
+
+	/* ethernet packet should be broadcasted */
+	if (do_bcast) {
+		primary_if = batadv_primary_if_get_selected(bat_priv);
+		if (!primary_if)
+			goto dropped;
+
+		/* in case of ARP request, we do not immediately broadcasti the
+		 * packet, instead we first wait for DAT to try to retrieve the
+		 * correct ARP entry
+		 */
+		if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb))
+			brd_delay = msecs_to_jiffies(ARP_REQ_DELAY);
+
+		if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0)
+			goto dropped;
+
+		bcast_packet = (struct batadv_bcast_packet *)skb->data;
+		bcast_packet->version = BATADV_COMPAT_VERSION;
+		bcast_packet->ttl = BATADV_TTL;
+
+		/* batman packet type: broadcast */
+		bcast_packet->packet_type = BATADV_BCAST;
+		bcast_packet->reserved = 0;
+
+		/* hw address of first interface is the orig mac because only
+		 * this mac is known throughout the mesh
+		 */
+		ether_addr_copy(bcast_packet->orig,
+				primary_if->net_dev->dev_addr);
+
+		/* set broadcast sequence number */
+		seqno = atomic_inc_return(&bat_priv->bcast_seqno);
+		bcast_packet->seqno = htonl(seqno);
+
+		batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true);
+
+		/* a copy is stored in the bcast list, therefore removing
+		 * the original skb.
+		 */
+		consume_skb(skb);
+
+	/* unicast packet */
+	} else {
+		/* DHCP packets going to a server will use the GW feature */
+		if (dhcp_rcp == BATADV_DHCP_TO_SERVER) {
+			ret = batadv_gw_out_of_range(bat_priv, skb);
+			if (ret)
+				goto dropped;
+			ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
+		} else if (mcast_single_orig) {
+			ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid,
+							  mcast_single_orig);
+		} else {
+			if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
+								  skb))
+				goto dropped;
+
+			batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
+
+			ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint,
+						     vid);
+		}
+		if (ret != NET_XMIT_SUCCESS)
+			goto dropped_freed;
+	}
+
+	batadv_inc_counter(bat_priv, BATADV_CNT_TX);
+	batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len);
+	goto end;
+
+dropped:
+	kfree_skb(skb);
+dropped_freed:
+	batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED);
+end:
+	if (mcast_single_orig)
+		batadv_orig_node_put(mcast_single_orig);
+	if (primary_if)
+		batadv_hardif_put(primary_if);
+	return NETDEV_TX_OK;
+}
+
+/**
+ * batadv_interface_rx() - receive ethernet frame on local batman-adv interface
+ * @soft_iface: local interface which will receive the ethernet frame
+ * @skb: ethernet frame for @soft_iface
+ * @hdr_size: size of already parsed batman-adv header
+ * @orig_node: originator from which the batman-adv packet was sent
+ *
+ * Sends a ethernet frame to the receive path of the local @soft_iface.
+ * skb->data has still point to the batman-adv header with the size @hdr_size.
+ * The caller has to have parsed this header already and made sure that at least
+ * @hdr_size bytes are still available for pull in @skb.
+ *
+ * The packet may still get dropped. This can happen when the encapsulated
+ * ethernet frame is invalid or contains again an batman-adv packet. Also
+ * unicast packets will be dropped directly when it was sent between two
+ * isolated clients.
+ */
+void batadv_interface_rx(struct net_device *soft_iface,
+			 struct sk_buff *skb, int hdr_size,
+			 struct batadv_orig_node *orig_node)
+{
+	struct batadv_bcast_packet *batadv_bcast_packet;
+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+	struct vlan_ethhdr *vhdr;
+	struct ethhdr *ethhdr;
+	unsigned short vid;
+	int packet_type;
+
+	batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data;
+	packet_type = batadv_bcast_packet->packet_type;
+
+	skb_pull_rcsum(skb, hdr_size);
+	skb_reset_mac_header(skb);
+
+	/* clean the netfilter state now that the batman-adv header has been
+	 * removed
+	 */
+	nf_reset(skb);
+
+	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+		goto dropped;
+
+	vid = batadv_get_vid(skb, 0);
+	ethhdr = eth_hdr(skb);
+
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_8021Q:
+		if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
+			goto dropped;
+
+		vhdr = (struct vlan_ethhdr *)skb->data;
+
+		/* drop batman-in-batman packets to prevent loops */
+		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
+			break;
+
+		/* fall through */
+	case ETH_P_BATMAN:
+		goto dropped;
+	}
+
+	/* skb->dev & skb->pkt_type are set here */
+	skb->protocol = eth_type_trans(skb, soft_iface);
+	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+	batadv_inc_counter(bat_priv, BATADV_CNT_RX);
+	batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
+			   skb->len + ETH_HLEN);
+
+	/* Let the bridge loop avoidance check the packet. If will
+	 * not handle it, we can safely push it up.
+	 */
+	if (batadv_bla_rx(bat_priv, skb, vid, packet_type))
+		goto out;
+
+	if (orig_node)
+		batadv_tt_add_temporary_global_entry(bat_priv, orig_node,
+						     ethhdr->h_source, vid);
+
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+		/* set the mark on broadcast packets if AP isolation is ON and
+		 * the packet is coming from an "isolated" client
+		 */
+		if (batadv_vlan_ap_isola_get(bat_priv, vid) &&
+		    batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source,
+						 vid)) {
+			/* save bits in skb->mark not covered by the mask and
+			 * apply the mark on the rest
+			 */
+			skb->mark &= ~bat_priv->isolation_mark_mask;
+			skb->mark |= bat_priv->isolation_mark;
+		}
+	} else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source,
+					 ethhdr->h_dest, vid)) {
+		goto dropped;
+	}
+
+	netif_rx(skb);
+	goto out;
+
+dropped:
+	kfree_skb(skb);
+out:
+	return;
+}
+
+/**
+ * batadv_softif_vlan_release() - release vlan from lists and queue for free
+ *  after rcu grace period
+ * @ref: kref pointer of the vlan object
+ */
+static void batadv_softif_vlan_release(struct kref *ref)
+{
+	struct batadv_softif_vlan *vlan;
+
+	vlan = container_of(ref, struct batadv_softif_vlan, refcount);
+
+	spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
+	hlist_del_rcu(&vlan->list);
+	spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock);
+
+	kfree_rcu(vlan, rcu);
+}
+
+/**
+ * batadv_softif_vlan_put() - decrease the vlan object refcounter and
+ *  possibly release it
+ * @vlan: the vlan object to release
+ */
+void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan)
+{
+	if (!vlan)
+		return;
+
+	kref_put(&vlan->refcount, batadv_softif_vlan_release);
+}
+
+/**
+ * batadv_softif_vlan_get() - get the vlan object for a specific vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the identifier of the vlan object to retrieve
+ *
+ * Return: the private data of the vlan matching the vid passed as argument or
+ * NULL otherwise. The refcounter of the returned object is incremented by 1.
+ */
+struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv,
+						  unsigned short vid)
+{
+	struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
+		if (vlan_tmp->vid != vid)
+			continue;
+
+		if (!kref_get_unless_zero(&vlan_tmp->refcount))
+			continue;
+
+		vlan = vlan_tmp;
+		break;
+	}
+	rcu_read_unlock();
+
+	return vlan;
+}
+
+/**
+ * batadv_softif_create_vlan() - allocate the needed resources for a new vlan
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier
+ *
+ * Return: 0 on success, a negative error otherwise.
+ */
+int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)
+{
+	struct batadv_softif_vlan *vlan;
+	int err;
+
+	spin_lock_bh(&bat_priv->softif_vlan_list_lock);
+
+	vlan = batadv_softif_vlan_get(bat_priv, vid);
+	if (vlan) {
+		batadv_softif_vlan_put(vlan);
+		spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
+		return -EEXIST;
+	}
+
+	vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
+	if (!vlan) {
+		spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
+		return -ENOMEM;
+	}
+
+	vlan->bat_priv = bat_priv;
+	vlan->vid = vid;
+	kref_init(&vlan->refcount);
+
+	atomic_set(&vlan->ap_isolation, 0);
+
+	kref_get(&vlan->refcount);
+	hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);
+	spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
+
+	/* batadv_sysfs_add_vlan cannot be in the spinlock section due to the
+	 * sleeping behavior of the sysfs functions and the fs_reclaim lock
+	 */
+	err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
+	if (err) {
+		/* ref for the function */
+		batadv_softif_vlan_put(vlan);
+
+		/* ref for the list */
+		batadv_softif_vlan_put(vlan);
+		return err;
+	}
+
+	/* add a new TT local entry. This one will be marked with the NOPURGE
+	 * flag
+	 */
+	batadv_tt_local_add(bat_priv->soft_iface,
+			    bat_priv->soft_iface->dev_addr, vid,
+			    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
+
+	/* don't return reference to new softif_vlan */
+	batadv_softif_vlan_put(vlan);
+
+	return 0;
+}
+
+/**
+ * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vlan: the object to remove
+ */
+static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,
+				       struct batadv_softif_vlan *vlan)
+{
+	/* explicitly remove the associated TT local entry because it is marked
+	 * with the NOPURGE flag
+	 */
+	batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,
+			       vlan->vid, "vlan interface destroyed", false);
+
+	batadv_sysfs_del_vlan(bat_priv, vlan);
+	batadv_softif_vlan_put(vlan);
+}
+
+/**
+ * batadv_interface_add_vid() - ndo_add_vid API implementation
+ * @dev: the netdev of the mesh interface
+ * @proto: protocol of the the vlan id
+ * @vid: identifier of the new vlan
+ *
+ * Set up all the internal structures for handling the new vlan on top of the
+ * mesh interface
+ *
+ * Return: 0 on success or a negative error code in case of failure.
+ */
+static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,
+				    unsigned short vid)
+{
+	struct batadv_priv *bat_priv = netdev_priv(dev);
+	struct batadv_softif_vlan *vlan;
+	int ret;
+
+	/* only 802.1Q vlans are supported.
+	 * batman-adv does not know how to handle other types
+	 */
+	if (proto != htons(ETH_P_8021Q))
+		return -EINVAL;
+
+	vid |= BATADV_VLAN_HAS_TAG;
+
+	/* if a new vlan is getting created and it already exists, it means that
+	 * it was not deleted yet. batadv_softif_vlan_get() increases the
+	 * refcount in order to revive the object.
+	 *
+	 * if it does not exist then create it.
+	 */
+	vlan = batadv_softif_vlan_get(bat_priv, vid);
+	if (!vlan)
+		return batadv_softif_create_vlan(bat_priv, vid);
+
+	/* recreate the sysfs object if it was already destroyed (and it should
+	 * be since we received a kill_vid() for this vlan
+	 */
+	if (!vlan->kobj) {
+		ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan);
+		if (ret) {
+			batadv_softif_vlan_put(vlan);
+			return ret;
+		}
+	}
+
+	/* add a new TT local entry. This one will be marked with the NOPURGE
+	 * flag. This must be added again, even if the vlan object already
+	 * exists, because the entry was deleted by kill_vid()
+	 */
+	batadv_tt_local_add(bat_priv->soft_iface,
+			    bat_priv->soft_iface->dev_addr, vid,
+			    BATADV_NULL_IFINDEX, BATADV_NO_MARK);
+
+	return 0;
+}
+
+/**
+ * batadv_interface_kill_vid() - ndo_kill_vid API implementation
+ * @dev: the netdev of the mesh interface
+ * @proto: protocol of the the vlan id
+ * @vid: identifier of the deleted vlan
+ *
+ * Destroy all the internal structures used to handle the vlan identified by vid
+ * on top of the mesh interface
+ *
+ * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q
+ * or -ENOENT if the specified vlan id wasn't registered.
+ */
+static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
+				     unsigned short vid)
+{
+	struct batadv_priv *bat_priv = netdev_priv(dev);
+	struct batadv_softif_vlan *vlan;
+
+	/* only 802.1Q vlans are supported. batman-adv does not know how to
+	 * handle other types
+	 */
+	if (proto != htons(ETH_P_8021Q))
+		return -EINVAL;
+
+	vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
+	if (!vlan)
+		return -ENOENT;
+
+	batadv_softif_destroy_vlan(bat_priv, vlan);
+
+	/* finally free the vlan object */
+	batadv_softif_vlan_put(vlan);
+
+	return 0;
+}
+
+/* batman-adv network devices have devices nesting below it and are a special
+ * "super class" of normal network devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key batadv_netdev_xmit_lock_key;
+static struct lock_class_key batadv_netdev_addr_lock_key;
+
+/**
+ * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
+ * @dev: device which owns the tx queue
+ * @txq: tx queue to modify
+ * @_unused: always NULL
+ */
+static void batadv_set_lockdep_class_one(struct net_device *dev,
+					 struct netdev_queue *txq,
+					 void *_unused)
+{
+	lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
+}
+
+/**
+ * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
+ * @dev: network device to modify
+ */
+static void batadv_set_lockdep_class(struct net_device *dev)
+{
+	lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key);
+	netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
+}
+
+/**
+ * batadv_softif_init_late() - late stage initialization of soft interface
+ * @dev: registered network device to modify
+ *
+ * Return: error code on failures
+ */
+static int batadv_softif_init_late(struct net_device *dev)
+{
+	struct batadv_priv *bat_priv;
+	u32 random_seqno;
+	int ret;
+	size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
+
+	batadv_set_lockdep_class(dev);
+
+	bat_priv = netdev_priv(dev);
+	bat_priv->soft_iface = dev;
+
+	/* batadv_interface_stats() needs to be available as soon as
+	 * register_netdevice() has been called
+	 */
+	bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64));
+	if (!bat_priv->bat_counters)
+		return -ENOMEM;
+
+	atomic_set(&bat_priv->aggregated_ogms, 1);
+	atomic_set(&bat_priv->bonding, 0);
+#ifdef CONFIG_BATMAN_ADV_BLA
+	atomic_set(&bat_priv->bridge_loop_avoidance, 1);
+#endif
+#ifdef CONFIG_BATMAN_ADV_DAT
+	atomic_set(&bat_priv->distributed_arp_table, 1);
+#endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	bat_priv->mcast.querier_ipv4.exists = false;
+	bat_priv->mcast.querier_ipv4.shadowing = false;
+	bat_priv->mcast.querier_ipv6.exists = false;
+	bat_priv->mcast.querier_ipv6.shadowing = false;
+	bat_priv->mcast.flags = BATADV_NO_FLAGS;
+	atomic_set(&bat_priv->multicast_mode, 1);
+	atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
+	atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
+	atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
+#endif
+	atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
+	atomic_set(&bat_priv->gw.bandwidth_down, 100);
+	atomic_set(&bat_priv->gw.bandwidth_up, 20);
+	atomic_set(&bat_priv->orig_interval, 1000);
+	atomic_set(&bat_priv->hop_penalty, 30);
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+	atomic_set(&bat_priv->log_level, 0);
+#endif
+	atomic_set(&bat_priv->fragmentation, 1);
+	atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN);
+	atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
+	atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
+
+	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
+	atomic_set(&bat_priv->bcast_seqno, 1);
+	atomic_set(&bat_priv->tt.vn, 0);
+	atomic_set(&bat_priv->tt.local_changes, 0);
+	atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
+#ifdef CONFIG_BATMAN_ADV_BLA
+	atomic_set(&bat_priv->bla.num_requests, 0);
+#endif
+	atomic_set(&bat_priv->tp_num, 0);
+
+	bat_priv->tt.last_changeset = NULL;
+	bat_priv->tt.last_changeset_len = 0;
+	bat_priv->isolation_mark = 0;
+	bat_priv->isolation_mark_mask = 0;
+
+	/* randomize initial seqno to avoid collision */
+	get_random_bytes(&random_seqno, sizeof(random_seqno));
+	atomic_set(&bat_priv->frag_seqno, random_seqno);
+
+	bat_priv->primary_if = NULL;
+	bat_priv->num_ifaces = 0;
+
+	batadv_nc_init_bat_priv(bat_priv);
+
+	ret = batadv_algo_select(bat_priv, batadv_routing_algo);
+	if (ret < 0)
+		goto free_bat_counters;
+
+	ret = batadv_debugfs_add_meshif(dev);
+	if (ret < 0)
+		goto free_bat_counters;
+
+	ret = batadv_mesh_init(dev);
+	if (ret < 0)
+		goto unreg_debugfs;
+
+	return 0;
+
+unreg_debugfs:
+	batadv_debugfs_del_meshif(dev);
+free_bat_counters:
+	free_percpu(bat_priv->bat_counters);
+	bat_priv->bat_counters = NULL;
+
+	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
+ * @extack: extended ACK report struct
+ *
+ * Return: 0 if successful or error otherwise.
+ */
+static int batadv_softif_slave_add(struct net_device *dev,
+				   struct net_device *slave_dev,
+				   struct netlink_ext_ack *extack)
+{
+	struct batadv_hard_iface *hard_iface;
+	struct net *net = dev_net(dev);
+	int ret = -EINVAL;
+
+	hard_iface = batadv_hardif_get_by_netdev(slave_dev);
+	if (!hard_iface || hard_iface->soft_iface)
+		goto out;
+
+	ret = batadv_hardif_enable_interface(hard_iface, net, dev->name);
+
+out:
+	if (hard_iface)
+		batadv_hardif_put(hard_iface);
+	return ret;
+}
+
+/**
+ * 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_put(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_vlan_rx_add_vid = batadv_interface_add_vid,
+	.ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
+	.ndo_set_mac_address = batadv_interface_set_mac_addr,
+	.ndo_change_mtu = batadv_interface_change_mtu,
+	.ndo_set_rx_mode = batadv_interface_set_rx_mode,
+	.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,
+};
+
+static void batadv_get_drvinfo(struct net_device *dev,
+			       struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver));
+	strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version));
+	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
+	strlcpy(info->bus_info, "batman", sizeof(info->bus_info));
+}
+
+/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702
+ * Declare each description string in struct.name[] to get fixed sized buffer
+ * and compile time checking for strings longer than ETH_GSTRING_LEN.
+ */
+static const struct {
+	const char name[ETH_GSTRING_LEN];
+} batadv_counters_strings[] = {
+	{ "tx" },
+	{ "tx_bytes" },
+	{ "tx_dropped" },
+	{ "rx" },
+	{ "rx_bytes" },
+	{ "forward" },
+	{ "forward_bytes" },
+	{ "mgmt_tx" },
+	{ "mgmt_tx_bytes" },
+	{ "mgmt_rx" },
+	{ "mgmt_rx_bytes" },
+	{ "frag_tx" },
+	{ "frag_tx_bytes" },
+	{ "frag_rx" },
+	{ "frag_rx_bytes" },
+	{ "frag_fwd" },
+	{ "frag_fwd_bytes" },
+	{ "tt_request_tx" },
+	{ "tt_request_rx" },
+	{ "tt_response_tx" },
+	{ "tt_response_rx" },
+	{ "tt_roam_adv_tx" },
+	{ "tt_roam_adv_rx" },
+#ifdef CONFIG_BATMAN_ADV_DAT
+	{ "dat_get_tx" },
+	{ "dat_get_rx" },
+	{ "dat_put_tx" },
+	{ "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, u32 stringset, u8 *data)
+{
+	if (stringset == ETH_SS_STATS)
+		memcpy(data, batadv_counters_strings,
+		       sizeof(batadv_counters_strings));
+}
+
+static void batadv_get_ethtool_stats(struct net_device *dev,
+				     struct ethtool_stats *stats, u64 *data)
+{
+	struct batadv_priv *bat_priv = netdev_priv(dev);
+	int i;
+
+	for (i = 0; i < BATADV_CNT_NUM; i++)
+		data[i] = batadv_sum_counter(bat_priv, i);
+}
+
+static int batadv_get_sset_count(struct net_device *dev, int stringset)
+{
+	if (stringset == ETH_SS_STATS)
+		return BATADV_CNT_NUM;
+
+	return -EOPNOTSUPP;
+}
+
+static const struct ethtool_ops batadv_ethtool_ops = {
+	.get_drvinfo = batadv_get_drvinfo,
+	.get_link = ethtool_op_get_link,
+	.get_strings = batadv_get_strings,
+	.get_ethtool_stats = batadv_get_ethtool_stats,
+	.get_sset_count = batadv_get_sset_count,
+};
+
+/**
+ * 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();
+}
+
+/**
+ * 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)
+{
+	ether_setup(dev);
+
+	dev->netdev_ops = &batadv_netdev_ops;
+	dev->needs_free_netdev = true;
+	dev->priv_destructor = batadv_softif_free;
+	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
+	dev->priv_flags |= IFF_NO_QUEUE;
+
+	/* can't call min_mtu, because the needed variables
+	 * have not been initialized yet
+	 */
+	dev->mtu = ETH_DATA_LEN;
+
+	/* generate random address */
+	eth_hw_addr_random(dev);
+
+	dev->ethtool_ops = &batadv_ethtool_ops;
+}
+
+/**
+ * batadv_softif_create() - Create and register soft interface
+ * @net: the applicable net namespace
+ * @name: name of the new soft interface
+ *
+ * Return: newly allocated soft_interface, NULL on errors
+ */
+struct net_device *batadv_softif_create(struct net *net, const char *name)
+{
+	struct net_device *soft_iface;
+	int ret;
+
+	soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
+				  NET_NAME_UNKNOWN, batadv_softif_init_early);
+	if (!soft_iface)
+		return NULL;
+
+	dev_net_set(soft_iface, net);
+
+	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);
+	struct batadv_softif_vlan *vlan;
+
+	ASSERT_RTNL();
+
+	/* destroy the "untagged" VLAN */
+	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
+	if (vlan) {
+		batadv_softif_destroy_vlan(bat_priv, vlan);
+		batadv_softif_vlan_put(vlan);
+	}
+
+	batadv_sysfs_del_meshif(soft_iface);
+	unregister_netdevice(soft_iface);
+}
+
+/**
+ * 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_priv *bat_priv = netdev_priv(soft_iface);
+	struct batadv_hard_iface *hard_iface;
+	struct batadv_softif_vlan *vlan;
+
+	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);
+	}
+
+	/* destroy the "untagged" VLAN */
+	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
+	if (vlan) {
+		batadv_softif_destroy_vlan(bat_priv, vlan);
+		batadv_softif_vlan_put(vlan);
+	}
+
+	batadv_sysfs_del_meshif(soft_iface);
+	unregister_netdevice_queue(soft_iface, head);
+}
+
+/**
+ * batadv_softif_is_valid() - Check whether device is a batadv soft interface
+ * @net_dev: device which should be checked
+ *
+ * Return: true when net_dev is a batman-adv interface, false otherwise
+ */
+bool batadv_softif_is_valid(const struct net_device *net_dev)
+{
+	if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
+		return true;
+
+	return false;
+}
+
+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,
+};