batman-adv: split tvlv into a separate file

The tvlv functionality in main.c is mostly unrelated to the rest of the
content. It still takes up a large portion of this source file (~45%, 588
lines). Moving it to a separate file makes it better visible as a main
component of the batman-adv implementation and hides it less in the other
helper functions in main.c

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
[sven@narfation.org: fix conflicts with current version, fix includes,
rewrote commit message]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

1 files changed, 630 insertions, 0 deletions

diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c
new file mode 100644
index 000000000000..2fd542e0d6a8
--- /dev/null
+++ b/net/batman-adv/tvlv.c
@@ -0,0 +1,630 @@
+/* Copyright (C) 2007-2016  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 <linux/byteorder/generic.h>
+#include <linux/etherdevice.h>
+#include <linux/fs.h>
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/lockdep.h>
+#include <linux/netdevice.h>
+#include <linux/pkt_sched.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include "originator.h"
+#include "packet.h"
+#include "send.h"
+#include "tvlv.h"
+
+/**
+ * batadv_tvlv_handler_release - release tvlv handler from lists and queue for
+ *  free after rcu grace period
+ * @ref: kref pointer of the tvlv
+ */
+static void batadv_tvlv_handler_release(struct kref *ref)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);
+	kfree_rcu(tvlv_handler, rcu);
+}
+
+/**
+ * batadv_tvlv_handler_put - decrement the tvlv container refcounter and
+ *  possibly release it
+ * @tvlv_handler: the tvlv handler to free
+ */
+static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)
+{
+	kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);
+}
+
+/**
+ * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
+ *  based on the provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv handler type to look for
+ * @version: tvlv handler version to look for
+ *
+ * Return: tvlv handler if found or NULL otherwise.
+ */
+static struct batadv_tvlv_handler *
+batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
+{
+	struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tvlv_handler_tmp,
+				 &bat_priv->tvlv.handler_list, list) {
+		if (tvlv_handler_tmp->type != type)
+			continue;
+
+		if (tvlv_handler_tmp->version != version)
+			continue;
+
+		if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))
+			continue;
+
+		tvlv_handler = tvlv_handler_tmp;
+		break;
+	}
+	rcu_read_unlock();
+
+	return tvlv_handler;
+}
+
+/**
+ * batadv_tvlv_container_release - release tvlv from lists and free
+ * @ref: kref pointer of the tvlv
+ */
+static void batadv_tvlv_container_release(struct kref *ref)
+{
+	struct batadv_tvlv_container *tvlv;
+
+	tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
+	kfree(tvlv);
+}
+
+/**
+ * batadv_tvlv_container_put - decrement the tvlv container refcounter and
+ *  possibly release it
+ * @tvlv: the tvlv container to free
+ */
+static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv)
+{
+	kref_put(&tvlv->refcount, batadv_tvlv_container_release);
+}
+
+/**
+ * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
+ *  list based on the provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv container type to look for
+ * @version: tvlv container version to look for
+ *
+ * Has to be called with the appropriate locks being acquired
+ * (tvlv.container_list_lock).
+ *
+ * Return: tvlv container if found or NULL otherwise.
+ */
+static struct batadv_tvlv_container *
+batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
+{
+	struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
+
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
+	hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
+		if (tvlv_tmp->tvlv_hdr.type != type)
+			continue;
+
+		if (tvlv_tmp->tvlv_hdr.version != version)
+			continue;
+
+		kref_get(&tvlv_tmp->refcount);
+		tvlv = tvlv_tmp;
+		break;
+	}
+
+	return tvlv;
+}
+
+/**
+ * batadv_tvlv_container_list_size - calculate the size of the tvlv container
+ *  list entries
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Has to be called with the appropriate locks being acquired
+ * (tvlv.container_list_lock).
+ *
+ * Return: size of all currently registered tvlv containers in bytes.
+ */
+static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
+{
+	struct batadv_tvlv_container *tvlv;
+	u16 tvlv_len = 0;
+
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
+	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
+		tvlv_len += sizeof(struct batadv_tvlv_hdr);
+		tvlv_len += ntohs(tvlv->tvlv_hdr.len);
+	}
+
+	return tvlv_len;
+}
+
+/**
+ * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
+ *  list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tvlv: the to be removed tvlv container
+ *
+ * Has to be called with the appropriate locks being acquired
+ * (tvlv.container_list_lock).
+ */
+static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
+					 struct batadv_tvlv_container *tvlv)
+{
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
+	if (!tvlv)
+		return;
+
+	hlist_del(&tvlv->list);
+
+	/* first call to decrement the counter, second call to free */
+	batadv_tvlv_container_put(tvlv);
+	batadv_tvlv_container_put(tvlv);
+}
+
+/**
+ * batadv_tvlv_container_unregister - unregister tvlv container based on the
+ *  provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv container type to unregister
+ * @version: tvlv container type to unregister
+ */
+void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
+				      u8 type, u8 version)
+{
+	struct batadv_tvlv_container *tvlv;
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv = batadv_tvlv_container_get(bat_priv, type, version);
+	batadv_tvlv_container_remove(bat_priv, tvlv);
+	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
+}
+
+/**
+ * batadv_tvlv_container_register - register tvlv type, version and content
+ *  to be propagated with each (primary interface) OGM
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv container type
+ * @version: tvlv container version
+ * @tvlv_value: tvlv container content
+ * @tvlv_value_len: tvlv container content length
+ *
+ * If a container of the same type and version was already registered the new
+ * content is going to replace the old one.
+ */
+void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
+				    u8 type, u8 version,
+				    void *tvlv_value, u16 tvlv_value_len)
+{
+	struct batadv_tvlv_container *tvlv_old, *tvlv_new;
+
+	if (!tvlv_value)
+		tvlv_value_len = 0;
+
+	tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
+	if (!tvlv_new)
+		return;
+
+	tvlv_new->tvlv_hdr.version = version;
+	tvlv_new->tvlv_hdr.type = type;
+	tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
+
+	memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
+	INIT_HLIST_NODE(&tvlv_new->list);
+	kref_init(&tvlv_new->refcount);
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
+	batadv_tvlv_container_remove(bat_priv, tvlv_old);
+	hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
+	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
+}
+
+/**
+ * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
+ *  requested packet size
+ * @packet_buff: packet buffer
+ * @packet_buff_len: packet buffer size
+ * @min_packet_len: requested packet minimum size
+ * @additional_packet_len: requested additional packet size on top of minimum
+ *  size
+ *
+ * Return: true of the packet buffer could be changed to the requested size,
+ * false otherwise.
+ */
+static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
+					    int *packet_buff_len,
+					    int min_packet_len,
+					    int additional_packet_len)
+{
+	unsigned char *new_buff;
+
+	new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
+
+	/* keep old buffer if kmalloc should fail */
+	if (!new_buff)
+		return false;
+
+	memcpy(new_buff, *packet_buff, min_packet_len);
+	kfree(*packet_buff);
+	*packet_buff = new_buff;
+	*packet_buff_len = min_packet_len + additional_packet_len;
+
+	return true;
+}
+
+/**
+ * batadv_tvlv_container_ogm_append - append tvlv container content to given
+ *  OGM packet buffer
+ * @bat_priv: the bat priv with all the soft interface information
+ * @packet_buff: ogm packet buffer
+ * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
+ *  content
+ * @packet_min_len: ogm header size to be preserved for the OGM itself
+ *
+ * The ogm packet might be enlarged or shrunk depending on the current size
+ * and the size of the to-be-appended tvlv containers.
+ *
+ * Return: size of all appended tvlv containers in bytes.
+ */
+u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
+				     unsigned char **packet_buff,
+				     int *packet_buff_len, int packet_min_len)
+{
+	struct batadv_tvlv_container *tvlv;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	u16 tvlv_value_len;
+	void *tvlv_value;
+	bool ret;
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
+
+	ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
+					      packet_min_len, tvlv_value_len);
+
+	if (!ret)
+		goto end;
+
+	if (!tvlv_value_len)
+		goto end;
+
+	tvlv_value = (*packet_buff) + packet_min_len;
+
+	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
+		tvlv_hdr = tvlv_value;
+		tvlv_hdr->type = tvlv->tvlv_hdr.type;
+		tvlv_hdr->version = tvlv->tvlv_hdr.version;
+		tvlv_hdr->len = tvlv->tvlv_hdr.len;
+		tvlv_value = tvlv_hdr + 1;
+		memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
+		tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
+	}
+
+end:
+	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
+	return tvlv_value_len;
+}
+
+/**
+ * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
+ *  appropriate handlers
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tvlv_handler: tvlv callback function handling the tvlv content
+ * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
+ * @orig_node: orig node emitting the ogm packet
+ * @src: source mac address of the unicast packet
+ * @dst: destination mac address of the unicast packet
+ * @tvlv_value: tvlv content
+ * @tvlv_value_len: tvlv content length
+ *
+ * Return: success if handler was not found or the return value of the handler
+ * callback.
+ */
+static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
+				    struct batadv_tvlv_handler *tvlv_handler,
+				    bool ogm_source,
+				    struct batadv_orig_node *orig_node,
+				    u8 *src, u8 *dst,
+				    void *tvlv_value, u16 tvlv_value_len)
+{
+	if (!tvlv_handler)
+		return NET_RX_SUCCESS;
+
+	if (ogm_source) {
+		if (!tvlv_handler->ogm_handler)
+			return NET_RX_SUCCESS;
+
+		if (!orig_node)
+			return NET_RX_SUCCESS;
+
+		tvlv_handler->ogm_handler(bat_priv, orig_node,
+					  BATADV_NO_FLAGS,
+					  tvlv_value, tvlv_value_len);
+		tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
+	} else {
+		if (!src)
+			return NET_RX_SUCCESS;
+
+		if (!dst)
+			return NET_RX_SUCCESS;
+
+		if (!tvlv_handler->unicast_handler)
+			return NET_RX_SUCCESS;
+
+		return tvlv_handler->unicast_handler(bat_priv, src,
+						     dst, tvlv_value,
+						     tvlv_value_len);
+	}
+
+	return NET_RX_SUCCESS;
+}
+
+/**
+ * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
+ *  appropriate handlers
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
+ * @orig_node: orig node emitting the ogm packet
+ * @src: source mac address of the unicast packet
+ * @dst: destination mac address of the unicast packet
+ * @tvlv_value: tvlv content
+ * @tvlv_value_len: tvlv content length
+ *
+ * Return: success when processing an OGM or the return value of all called
+ * handler callbacks.
+ */
+int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
+				   bool ogm_source,
+				   struct batadv_orig_node *orig_node,
+				   u8 *src, u8 *dst,
+				   void *tvlv_value, u16 tvlv_value_len)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	u16 tvlv_value_cont_len;
+	u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
+	int ret = NET_RX_SUCCESS;
+
+	while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
+		tvlv_hdr = tvlv_value;
+		tvlv_value_cont_len = ntohs(tvlv_hdr->len);
+		tvlv_value = tvlv_hdr + 1;
+		tvlv_value_len -= sizeof(*tvlv_hdr);
+
+		if (tvlv_value_cont_len > tvlv_value_len)
+			break;
+
+		tvlv_handler = batadv_tvlv_handler_get(bat_priv,
+						       tvlv_hdr->type,
+						       tvlv_hdr->version);
+
+		ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
+						ogm_source, orig_node,
+						src, dst, tvlv_value,
+						tvlv_value_cont_len);
+		if (tvlv_handler)
+			batadv_tvlv_handler_put(tvlv_handler);
+		tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
+		tvlv_value_len -= tvlv_value_cont_len;
+	}
+
+	if (!ogm_source)
+		return ret;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tvlv_handler,
+				 &bat_priv->tvlv.handler_list, list) {
+		if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
+		    !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
+			tvlv_handler->ogm_handler(bat_priv, orig_node,
+						  cifnotfound, NULL, 0);
+
+		tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
+	}
+	rcu_read_unlock();
+
+	return NET_RX_SUCCESS;
+}
+
+/**
+ * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
+ *  handlers
+ * @bat_priv: the bat priv with all the soft interface information
+ * @batadv_ogm_packet: ogm packet containing the tvlv containers
+ * @orig_node: orig node emitting the ogm packet
+ */
+void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
+			     struct batadv_ogm_packet *batadv_ogm_packet,
+			     struct batadv_orig_node *orig_node)
+{
+	void *tvlv_value;
+	u16 tvlv_value_len;
+
+	if (!batadv_ogm_packet)
+		return;
+
+	tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
+	if (!tvlv_value_len)
+		return;
+
+	tvlv_value = batadv_ogm_packet + 1;
+
+	batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
+				       tvlv_value, tvlv_value_len);
+}
+
+/**
+ * batadv_tvlv_handler_register - register tvlv handler based on the provided
+ *  type and version (both need to match) for ogm tvlv payload and/or unicast
+ *  payload
+ * @bat_priv: the bat priv with all the soft interface information
+ * @optr: ogm tvlv handler callback function. This function receives the orig
+ *  node, flags and the tvlv content as argument to process.
+ * @uptr: unicast tvlv handler callback function. This function receives the
+ *  source & destination of the unicast packet as well as the tvlv content
+ *  to process.
+ * @type: tvlv handler type to be registered
+ * @version: tvlv handler version to be registered
+ * @flags: flags to enable or disable TVLV API behavior
+ */
+void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
+				  void (*optr)(struct batadv_priv *bat_priv,
+					       struct batadv_orig_node *orig,
+					       u8 flags,
+					       void *tvlv_value,
+					       u16 tvlv_value_len),
+				  int (*uptr)(struct batadv_priv *bat_priv,
+					      u8 *src, u8 *dst,
+					      void *tvlv_value,
+					      u16 tvlv_value_len),
+				  u8 type, u8 version, u8 flags)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
+	if (tvlv_handler) {
+		batadv_tvlv_handler_put(tvlv_handler);
+		return;
+	}
+
+	tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
+	if (!tvlv_handler)
+		return;
+
+	tvlv_handler->ogm_handler = optr;
+	tvlv_handler->unicast_handler = uptr;
+	tvlv_handler->type = type;
+	tvlv_handler->version = version;
+	tvlv_handler->flags = flags;
+	kref_init(&tvlv_handler->refcount);
+	INIT_HLIST_NODE(&tvlv_handler->list);
+
+	spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
+	hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
+	spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
+}
+
+/**
+ * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
+ *  provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv handler type to be unregistered
+ * @version: tvlv handler version to be unregistered
+ */
+void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
+				    u8 type, u8 version)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
+	if (!tvlv_handler)
+		return;
+
+	batadv_tvlv_handler_put(tvlv_handler);
+	spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
+	hlist_del_rcu(&tvlv_handler->list);
+	spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
+	batadv_tvlv_handler_put(tvlv_handler);
+}
+
+/**
+ * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
+ *  specified host
+ * @bat_priv: the bat priv with all the soft interface information
+ * @src: source mac address of the unicast packet
+ * @dst: destination mac address of the unicast packet
+ * @type: tvlv type
+ * @version: tvlv version
+ * @tvlv_value: tvlv content
+ * @tvlv_value_len: tvlv content length
+ */
+void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
+			      u8 *dst, u8 type, u8 version,
+			      void *tvlv_value, u16 tvlv_value_len)
+{
+	struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	struct batadv_orig_node *orig_node;
+	struct sk_buff *skb;
+	unsigned char *tvlv_buff;
+	unsigned int tvlv_len;
+	ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
+
+	orig_node = batadv_orig_hash_find(bat_priv, dst);
+	if (!orig_node)
+		return;
+
+	tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
+
+	skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
+	if (!skb)
+		goto out;
+
+	skb->priority = TC_PRIO_CONTROL;
+	skb_reserve(skb, ETH_HLEN);
+	tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
+	unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
+	unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
+	unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
+	unicast_tvlv_packet->ttl = BATADV_TTL;
+	unicast_tvlv_packet->reserved = 0;
+	unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
+	unicast_tvlv_packet->align = 0;
+	ether_addr_copy(unicast_tvlv_packet->src, src);
+	ether_addr_copy(unicast_tvlv_packet->dst, dst);
+
+	tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
+	tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
+	tvlv_hdr->version = version;
+	tvlv_hdr->type = type;
+	tvlv_hdr->len = htons(tvlv_value_len);
+	tvlv_buff += sizeof(*tvlv_hdr);
+	memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
+
+	if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP)
+		kfree_skb(skb);
+out:
+	batadv_orig_node_put(orig_node);
+}