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

Pull networking updates from David Miller:

 1) The addition of nftables.  No longer will we need protocol aware
    firewall filtering modules, it can all live in userspace.

    At the core of nftables is a, for lack of a better term, virtual
    machine that executes byte codes to inspect packet or metadata
    (arriving interface index, etc.) and make verdict decisions.

    Besides support for loading packet contents and comparing them, the
    interpreter supports lookups in various datastructures as
    fundamental operations.  For example sets are supports, and
    therefore one could create a set of whitelist IP address entries
    which have ACCEPT verdicts attached to them, and use the appropriate
    byte codes to do such lookups.

    Since the interpreted code is composed in userspace, userspace can
    do things like optimize things before giving it to the kernel.

    Another major improvement is the capability of atomically updating
    portions of the ruleset.  In the existing netfilter implementation,
    one has to update the entire rule set in order to make a change and
    this is very expensive.

    Userspace tools exist to create nftables rules using existing
    netfilter rule sets, but both kernel implementations will need to
    co-exist for quite some time as we transition from the old to the
    new stuff.

    Kudos to Patrick McHardy, Pablo Neira Ayuso, and others who have
    worked so hard on this.

 2) Daniel Borkmann and Hannes Frederic Sowa made several improvements
    to our pseudo-random number generator, mostly used for things like
    UDP port randomization and netfitler, amongst other things.

    In particular the taus88 generater is updated to taus113, and test
    cases are added.

 3) Support 64-bit rates in HTB and TBF schedulers, from Eric Dumazet
    and Yang Yingliang.

 4) Add support for new 577xx tigon3 chips to tg3 driver, from Nithin
    Sujir.

 5) Fix two fatal flaws in TCP dynamic right sizing, from Eric Dumazet,
    Neal Cardwell, and Yuchung Cheng.

 6) Allow IP_TOS and IP_TTL to be specified in sendmsg() ancillary
    control message data, much like other socket option attributes.
    From Francesco Fusco.

 7) Allow applications to specify a cap on the rate computed
    automatically by the kernel for pacing flows, via a new
    SO_MAX_PACING_RATE socket option.  From Eric Dumazet.

 8) Make the initial autotuned send buffer sizing in TCP more closely
    reflect actual needs, from Eric Dumazet.

 9) Currently early socket demux only happens for TCP sockets, but we
    can do it for connected UDP sockets too.  Implementation from Shawn
    Bohrer.

10) Refactor inet socket demux with the goal of improving hash demux
    performance for listening sockets.  With the main goals being able
    to use RCU lookups on even request sockets, and eliminating the
    listening lock contention.  From Eric Dumazet.

11) The bonding layer has many demuxes in it's fast path, and an RCU
    conversion was started back in 3.11, several changes here extend the
    RCU usage to even more locations.  From Ding Tianhong and Wang
    Yufen, based upon suggestions by Nikolay Aleksandrov and Veaceslav
    Falico.

12) Allow stackability of segmentation offloads to, in particular, allow
    segmentation offloading over tunnels.  From Eric Dumazet.

13) Significantly improve the handling of secret keys we input into the
    various hash functions in the inet hashtables, TCP fast open, as
    well as syncookies.  From Hannes Frederic Sowa.  The key fundamental
    operation is "net_get_random_once()" which uses static keys.

    Hannes even extended this to ipv4/ipv6 fragmentation handling and
    our generic flow dissector.

14) The generic driver layer takes care now to set the driver data to
    NULL on device removal, so it's no longer necessary for drivers to
    explicitly set it to NULL any more.  Many drivers have been cleaned
    up in this way, from Jingoo Han.

15) Add a BPF based packet scheduler classifier, from Daniel Borkmann.

16) Improve CRC32 interfaces and generic SKB checksum iterators so that
    SCTP's checksumming can more cleanly be handled.  Also from Daniel
    Borkmann.

17) Add a new PMTU discovery mode, IP_PMTUDISC_INTERFACE, which forces
    using the interface MTU value.  This helps avoid PMTU attacks,
    particularly on DNS servers.  From Hannes Frederic Sowa.

18) Use generic XPS for transmit queue steering rather than internal
    (re-)implementation in virtio-net.  From Jason Wang.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1622 commits)
  random32: add test cases for taus113 implementation
  random32: upgrade taus88 generator to taus113 from errata paper
  random32: move rnd_state to linux/random.h
  random32: add prandom_reseed_late() and call when nonblocking pool becomes initialized
  random32: add periodic reseeding
  random32: fix off-by-one in seeding requirement
  PHY: Add RTL8201CP phy_driver to realtek
  xtsonic: add missing platform_set_drvdata() in xtsonic_probe()
  macmace: add missing platform_set_drvdata() in mace_probe()
  ethernet/arc/arc_emac: add missing platform_set_drvdata() in arc_emac_probe()
  ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh
  vlan: Implement vlan_dev_get_egress_qos_mask as an inline.
  ixgbe: add warning when max_vfs is out of range.
  igb: Update link modes display in ethtool
  netfilter: push reasm skb through instead of original frag skbs
  ip6_output: fragment outgoing reassembled skb properly
  MAINTAINERS: mv643xx_eth: take over maintainership from Lennart
  net_sched: tbf: support of 64bit rates
  ixgbe: deleting dfwd stations out of order can cause null ptr deref
  ixgbe: fix build err, num_rx_queues is only available with CONFIG_RPS
  ...

1 files changed, 663 insertions, 26 deletions

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 1356af660b5b..c51a5e568f0a 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -36,10 +36,11 @@
 #include "gateway_client.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
-#include "vis.h"
+#include "gateway_common.h"
 #include "hash.h"
 #include "bat_algo.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 
 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
@@ -109,9 +110,11 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	spin_lock_init(&bat_priv->tt.req_list_lock);
 	spin_lock_init(&bat_priv->tt.roam_list_lock);
 	spin_lock_init(&bat_priv->tt.last_changeset_lock);
+	spin_lock_init(&bat_priv->tt.commit_lock);
 	spin_lock_init(&bat_priv->gw.list_lock);
-	spin_lock_init(&bat_priv->vis.hash_lock);
-	spin_lock_init(&bat_priv->vis.list_lock);
+	spin_lock_init(&bat_priv->tvlv.container_list_lock);
+	spin_lock_init(&bat_priv->tvlv.handler_list_lock);
+	spin_lock_init(&bat_priv->softif_vlan_list_lock);
 
 	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
 	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
@@ -119,6 +122,9 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
 	INIT_LIST_HEAD(&bat_priv->tt.req_list);
 	INIT_LIST_HEAD(&bat_priv->tt.roam_list);
+	INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
+	INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
+	INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
 
 	ret = batadv_originator_init(bat_priv);
 	if (ret < 0)
@@ -128,13 +134,6 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	if (ret < 0)
 		goto err;
 
-	batadv_tt_local_add(soft_iface, soft_iface->dev_addr,
-			    BATADV_NULL_IFINDEX);
-
-	ret = batadv_vis_init(bat_priv);
-	if (ret < 0)
-		goto err;
-
 	ret = batadv_bla_init(bat_priv);
 	if (ret < 0)
 		goto err;
@@ -147,6 +146,8 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	if (ret < 0)
 		goto err;
 
+	batadv_gw_init(bat_priv);
+
 	atomic_set(&bat_priv->gw.reselect, 0);
 	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
 
@@ -165,8 +166,6 @@ void batadv_mesh_free(struct net_device *soft_iface)
 
 	batadv_purge_outstanding_packets(bat_priv, NULL);
 
-	batadv_vis_quit(bat_priv);
-
 	batadv_gw_node_purge(bat_priv);
 	batadv_nc_mesh_free(bat_priv);
 	batadv_dat_free(bat_priv);
@@ -185,6 +184,8 @@ void batadv_mesh_free(struct net_device *soft_iface)
 	 */
 	batadv_originator_free(bat_priv);
 
+	batadv_gw_free(bat_priv);
+
 	free_percpu(bat_priv->bat_counters);
 	bat_priv->bat_counters = NULL;
 
@@ -255,6 +256,31 @@ out:
 }
 
 /**
+ * batadv_max_header_len - calculate maximum encapsulation overhead for a
+ *  payload packet
+ *
+ * Return the maximum encapsulation overhead in bytes.
+ */
+int batadv_max_header_len(void)
+{
+	int header_len = 0;
+
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_unicast_packet));
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_unicast_4addr_packet));
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_bcast_packet));
+
+#ifdef CONFIG_BATMAN_ADV_NC
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_coded_packet));
+#endif
+
+	return header_len;
+}
+
+/**
  * batadv_skb_set_priority - sets skb priority according to packet content
  * @skb: the packet to be sent
  * @offset: offset to the packet content
@@ -392,22 +418,31 @@ static void batadv_recv_handler_init(void)
 	for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
 		batadv_rx_handler[i] = batadv_recv_unhandled_packet;
 
-	/* batman icmp packet */
-	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
+	for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
+		batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
+
+	/* compile time checks for struct member offsets */
+	BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10);
+	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, icmph.dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, icmph.dst) != 4);
+
+	/* broadcast packet */
+	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
+
+	/* unicast packets ... */
 	/* unicast with 4 addresses packet */
 	batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
 	/* unicast packet */
 	batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
-	/* fragmented unicast packet */
-	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
-	/* broadcast packet */
-	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
-	/* vis packet */
-	batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
-	/* Translation table query (request or response) */
-	batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
-	/* Roaming advertisement */
-	batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
+	/* unicast tvlv packet */
+	batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
+	/* batman icmp packet */
+	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
+	/* Fragmented packets */
+	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
 }
 
 int
@@ -415,7 +450,12 @@ batadv_recv_handler_register(uint8_t packet_type,
 			     int (*recv_handler)(struct sk_buff *,
 						 struct batadv_hard_iface *))
 {
-	if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
+	int (*curr)(struct sk_buff *,
+		    struct batadv_hard_iface *);
+	curr = batadv_rx_handler[packet_type];
+
+	if ((curr != batadv_recv_unhandled_packet) &&
+	    (curr != batadv_recv_unhandled_unicast_packet))
 		return -EBUSY;
 
 	batadv_rx_handler[packet_type] = recv_handler;
@@ -461,7 +501,9 @@ int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
 	    !bat_algo_ops->bat_iface_update_mac ||
 	    !bat_algo_ops->bat_primary_iface_set ||
 	    !bat_algo_ops->bat_ogm_schedule ||
-	    !bat_algo_ops->bat_ogm_emit) {
+	    !bat_algo_ops->bat_ogm_emit ||
+	    !bat_algo_ops->bat_neigh_cmp ||
+	    !bat_algo_ops->bat_neigh_is_equiv_or_better) {
 		pr_info("Routing algo '%s' does not implement required ops\n",
 			bat_algo_ops->name);
 		ret = -EINVAL;
@@ -536,6 +578,601 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
 	return htonl(crc);
 }
 
+/**
+ * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
+ *  possibly free it
+ * @tvlv_handler: the tvlv handler to free
+ */
+static void
+batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler)
+{
+	if (atomic_dec_and_test(&tvlv_handler->refcount))
+		kfree_rcu(tvlv_handler, rcu);
+}
+
+/**
+ * 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
+ *
+ * Returns tvlv handler if found or NULL otherwise.
+ */
+static struct batadv_tvlv_handler
+*batadv_tvlv_handler_get(struct batadv_priv *bat_priv,
+			 uint8_t type, uint8_t 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 (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount))
+			continue;
+
+		tvlv_handler = tvlv_handler_tmp;
+		break;
+	}
+	rcu_read_unlock();
+
+	return tvlv_handler;
+}
+
+/**
+ * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
+ *  possibly free it
+ * @tvlv_handler: the tvlv container to free
+ */
+static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv)
+{
+	if (atomic_dec_and_test(&tvlv->refcount))
+		kfree(tvlv);
+}
+
+/**
+ * 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).
+ *
+ * Returns tvlv container if found or NULL otherwise.
+ */
+static struct batadv_tvlv_container
+*batadv_tvlv_container_get(struct batadv_priv *bat_priv,
+			   uint8_t type, uint8_t version)
+{
+	struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
+
+	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;
+
+		if (!atomic_inc_not_zero(&tvlv_tmp->refcount))
+			continue;
+
+		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).
+ *
+ * Returns size of all currently registered tvlv containers in bytes.
+ */
+static uint16_t batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
+{
+	struct batadv_tvlv_container *tvlv;
+	uint16_t tvlv_len = 0;
+
+	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
+ * @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_tvlv_container *tvlv)
+{
+	if (!tvlv)
+		return;
+
+	hlist_del(&tvlv->list);
+
+	/* first call to decrement the counter, second call to free */
+	batadv_tvlv_container_free_ref(tvlv);
+	batadv_tvlv_container_free_ref(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,
+				      uint8_t type, uint8_t 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(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,
+				    uint8_t type, uint8_t version,
+				    void *tvlv_value, uint16_t 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);
+	atomic_set(&tvlv_new->refcount, 1);
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
+	batadv_tvlv_container_remove(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 accomodate
+ *  requested packet size
+ * @packet_buff: packet buffer
+ * @packet_buff_len: packet buffer size
+ * @packet_min_len: requested packet minimum size
+ * @additional_packet_len: requested additional packet size on top of minimum
+ *  size
+ *
+ * Returns 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) {
+		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;
+	}
+
+	return false;
+}
+
+/**
+ * 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.
+ *
+ * Returns size of all appended tvlv containers in bytes.
+ */
+uint16_t 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;
+	uint16_t 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 = (uint8_t *)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 wether 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
+ *
+ * Returns 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,
+				    uint8_t *src, uint8_t *dst,
+				    void *tvlv_value, uint16_t 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 wether 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
+ *
+ * Returns 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,
+				   uint8_t *src, uint8_t *dst,
+				   void *tvlv_value, uint16_t tvlv_value_len)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	uint16_t tvlv_value_cont_len;
+	uint8_t 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_free_ref(tvlv_handler);
+		tvlv_value = (uint8_t *)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;
+	uint16_t 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,
+					       uint8_t flags,
+					       void *tvlv_value,
+					       uint16_t tvlv_value_len),
+				  int (*uptr)(struct batadv_priv *bat_priv,
+					      uint8_t *src, uint8_t *dst,
+					      void *tvlv_value,
+					      uint16_t tvlv_value_len),
+				  uint8_t type, uint8_t version, uint8_t flags)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
+	if (tvlv_handler) {
+		batadv_tvlv_handler_free_ref(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;
+	atomic_set(&tvlv_handler->refcount, 1);
+	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,
+				    uint8_t type, uint8_t version)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
+	if (!tvlv_handler)
+		return;
+
+	batadv_tvlv_handler_free_ref(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_free_ref(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, uint8_t *src,
+			      uint8_t *dst, uint8_t type, uint8_t version,
+			      void *tvlv_value, uint16_t 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 = NULL;
+	unsigned char *tvlv_buff;
+	unsigned int tvlv_len;
+	ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
+	bool ret = false;
+
+	orig_node = batadv_orig_hash_find(bat_priv, dst);
+	if (!orig_node)
+		goto out;
+
+	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->header.packet_type = BATADV_UNICAST_TVLV;
+	unicast_tvlv_packet->header.version = BATADV_COMPAT_VERSION;
+	unicast_tvlv_packet->header.ttl = BATADV_TTL;
+	unicast_tvlv_packet->reserved = 0;
+	unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
+	unicast_tvlv_packet->align = 0;
+	memcpy(unicast_tvlv_packet->src, src, ETH_ALEN);
+	memcpy(unicast_tvlv_packet->dst, dst, ETH_ALEN);
+
+	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)
+		ret = true;
+
+out:
+	if (skb && !ret)
+		kfree_skb(skb);
+	if (orig_node)
+		batadv_orig_node_free_ref(orig_node);
+}
+
+/**
+ * batadv_get_vid - extract the VLAN identifier from skb if any
+ * @skb: the buffer containing the packet
+ * @header_len: length of the batman header preceding the ethernet header
+ *
+ * If the packet embedded in the skb is vlan tagged this function returns the
+ * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned.
+ */
+unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
+	struct vlan_ethhdr *vhdr;
+	unsigned short vid;
+
+	if (ethhdr->h_proto != htons(ETH_P_8021Q))
+		return BATADV_NO_FLAGS;
+
+	if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
+		return BATADV_NO_FLAGS;
+
+	vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
+	vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
+	vid |= BATADV_VLAN_HAS_TAG;
+
+	return vid;
+}
+
 static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
 {
 	struct batadv_algo_ops *bat_algo_ops;