Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge

Antonio Quartulli says:

====================
Included changes:
- use ether_addr_copy instead of memcpy when possible
- implement new multicast packet optimisation
- improve several kerneldoc sections
- minor code cleanups

here you have our patchset for net-next/linux-3.15.  They are 16
patches but most of them are just small cleanups and kerneldoc
improvements.

The only big change is the one from patch 8 to 13 by Linus Lüssing
that introduces a new multicast packets optimisation. This new
component aims to reduce the air overhead by sending multicast packets
as bat-unicast when only one destination exists or by dropping them
directly at the source if the multicast group is totally empty.

In patch 11 Linus introduces an atomic_t variable, that like others
that we already have is only object of write and read, thus making the
atomic characteristic totally useless.  Unfortunately this is part of
our sysfs framework, that helps the developer to introduce new knobs
by using few macros only. For this reason we decided to keep Linus'
new knob for now, but I'd like to let you know that we are in the
process of re-working such framework in order to convert all the
current (useless) atomic_t to boolean in one go.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

25 files changed, 1237 insertions, 144 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-net-mesh b/Documentation/ABI/testing/sysfs-class-net-mesh
index 4793d3dff6af..c46406296631 100644
--- a/Documentation/ABI/testing/sysfs-class-net-mesh
+++ b/Documentation/ABI/testing/sysfs-class-net-mesh
@@ -76,6 +76,15 @@ Description:
 		is used to classify clients as "isolated" by the
 		Extended Isolation feature.
 
+What:           /sys/class/net/<mesh_iface>/mesh/multicast_mode
+Date:           Feb 2014
+Contact:        Linus Lüssing <linus.luessing@web.de>
+Description:
+                Indicates whether multicast optimizations are enabled
+                or disabled. If set to zero then all nodes in the
+                mesh are going to use classic flooding for any
+                multicast packet with no optimizations.
+
 What:           /sys/class/net/<mesh_iface>/mesh/network_coding
 Date:           Nov 2012
 Contact:        Martin Hundeboll <martin@hundeboll.net>
diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig
index fa780b76630e..11660a3aab5a 100644
--- a/net/batman-adv/Kconfig
+++ b/net/batman-adv/Kconfig
@@ -50,6 +50,15 @@ config BATMAN_ADV_NC
 	  If you think that your network does not need this feature you
 	  can safely disable it and save some space.
 
+config BATMAN_ADV_MCAST
+	bool "Multicast optimisation"
+	depends on BATMAN_ADV
+	default n
+	help
+	  This option enables the multicast optimisation which aims to
+	  reduce the air overhead while improving the reliability of
+	  multicast messages.
+
 config BATMAN_ADV_DEBUG
 	bool "B.A.T.M.A.N. debugging"
 	depends on BATMAN_ADV
diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index 42df18f877e9..eb7d8c0388e4 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -36,3 +36,4 @@ batman-adv-y += send.o
 batman-adv-y += soft-interface.o
 batman-adv-y += sysfs.o
 batman-adv-y += translation-table.o
+batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 8323bced8e5b..b3bd4ec3fd94 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -347,10 +347,10 @@ static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
 	unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
 
 	batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
-	memcpy(batadv_ogm_packet->orig,
-	       hard_iface->net_dev->dev_addr, ETH_ALEN);
-	memcpy(batadv_ogm_packet->prev_sender,
-	       hard_iface->net_dev->dev_addr, ETH_ALEN);
+	ether_addr_copy(batadv_ogm_packet->orig,
+			hard_iface->net_dev->dev_addr);
+	ether_addr_copy(batadv_ogm_packet->prev_sender,
+			hard_iface->net_dev->dev_addr);
 }
 
 static void
@@ -830,7 +830,7 @@ static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 	tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
 
 	batadv_ogm_packet->ttl--;
-	memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
+	ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
 
 	/* apply hop penalty */
 	batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 05f0712be5e7..6f0d9ec37950 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -191,7 +191,7 @@ batadv_backbone_hash_find(struct batadv_priv *bat_priv,
 	if (!hash)
 		return NULL;
 
-	memcpy(search_entry.orig, addr, ETH_ALEN);
+	ether_addr_copy(search_entry.orig, addr);
 	search_entry.vid = vid;
 
 	index = batadv_choose_backbone_gw(&search_entry, hash->size);
@@ -305,7 +305,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
 		/* normal claim frame
 		 * set Ethernet SRC to the clients mac
 		 */
-		memcpy(ethhdr->h_source, mac, ETH_ALEN);
+		ether_addr_copy(ethhdr->h_source, mac);
 		batadv_dbg(BATADV_DBG_BLA, bat_priv,
 			   "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
 			   BATADV_PRINT_VID(vid));
@@ -314,7 +314,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
 		/* unclaim frame
 		 * set HW SRC to the clients mac
 		 */
-		memcpy(hw_src, mac, ETH_ALEN);
+		ether_addr_copy(hw_src, mac);
 		batadv_dbg(BATADV_DBG_BLA, bat_priv,
 			   "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
 			   BATADV_PRINT_VID(vid));
@@ -323,7 +323,7 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
 		/* announcement frame
 		 * set HW SRC to the special mac containg the crc
 		 */
-		memcpy(hw_src, mac, ETH_ALEN);
+		ether_addr_copy(hw_src, mac);
 		batadv_dbg(BATADV_DBG_BLA, bat_priv,
 			   "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
 			   ethhdr->h_source, BATADV_PRINT_VID(vid));
@@ -333,8 +333,8 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
 		 * set HW SRC and header destination to the receiving backbone
 		 * gws mac
 		 */
-		memcpy(hw_src, mac, ETH_ALEN);
-		memcpy(ethhdr->h_dest, mac, ETH_ALEN);
+		ether_addr_copy(hw_src, mac);
+		ether_addr_copy(ethhdr->h_dest, mac);
 		batadv_dbg(BATADV_DBG_BLA, bat_priv,
 			   "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
 			   ethhdr->h_source, ethhdr->h_dest,
@@ -395,7 +395,7 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
 	entry->bat_priv = bat_priv;
 	atomic_set(&entry->request_sent, 0);
 	atomic_set(&entry->wait_periods, 0);
-	memcpy(entry->orig, orig, ETH_ALEN);
+	ether_addr_copy(entry->orig, orig);
 
 	/* one for the hash, one for returning */
 	atomic_set(&entry->refcount, 2);
@@ -563,7 +563,7 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
 	struct batadv_bla_claim search_claim;
 	int hash_added;
 
-	memcpy(search_claim.addr, mac, ETH_ALEN);
+	ether_addr_copy(search_claim.addr, mac);
 	search_claim.vid = vid;
 	claim = batadv_claim_hash_find(bat_priv, &search_claim);
 
@@ -573,7 +573,7 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
 		if (!claim)
 			return;
 
-		memcpy(claim->addr, mac, ETH_ALEN);
+		ether_addr_copy(claim->addr, mac);
 		claim->vid = vid;
 		claim->lasttime = jiffies;
 		claim->backbone_gw = backbone_gw;
@@ -624,7 +624,7 @@ static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
 {
 	struct batadv_bla_claim search_claim, *claim;
 
-	memcpy(search_claim.addr, mac, ETH_ALEN);
+	ether_addr_copy(search_claim.addr, mac);
 	search_claim.vid = vid;
 	claim = batadv_claim_hash_find(bat_priv, &search_claim);
 	if (!claim)
@@ -882,7 +882,7 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
 	proto = ethhdr->h_proto;
 	headlen = ETH_HLEN;
 	if (vid & BATADV_VLAN_HAS_TAG) {
-		vhdr = (struct vlan_ethhdr *)ethhdr;
+		vhdr = vlan_eth_hdr(skb);
 		proto = vhdr->h_vlan_encapsulated_proto;
 		headlen += VLAN_HLEN;
 	}
@@ -1103,8 +1103,8 @@ void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
 						oldif->net_dev->dev_addr))
 				continue;
 
-			memcpy(backbone_gw->orig,
-			       primary_if->net_dev->dev_addr, ETH_ALEN);
+			ether_addr_copy(backbone_gw->orig,
+					primary_if->net_dev->dev_addr);
 			/* send an announce frame so others will ask for our
 			 * claims and update their tables.
 			 */
@@ -1310,7 +1310,7 @@ int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
 	entry = &bat_priv->bla.bcast_duplist[curr];
 	entry->crc = crc;
 	entry->entrytime = jiffies;
-	memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
+	ether_addr_copy(entry->orig, bcast_packet->orig);
 	bat_priv->bla.bcast_duplist_curr = curr;
 
 out:
@@ -1458,7 +1458,7 @@ int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
 		if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
 			goto handled;
 
-	memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
+	ether_addr_copy(search_claim.addr, ethhdr->h_source);
 	search_claim.vid = vid;
 	claim = batadv_claim_hash_find(bat_priv, &search_claim);
 
@@ -1547,9 +1547,6 @@ int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
 	if (!atomic_read(&bat_priv->bridge_loop_avoidance))
 		goto allow;
 
-	/* in VLAN case, the mac header might not be set. */
-	skb_reset_mac_header(skb);
-
 	if (batadv_bla_process_claim(bat_priv, primary_if, skb))
 		goto handled;
 
@@ -1560,7 +1557,7 @@ int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
 		if (is_multicast_ether_addr(ethhdr->h_dest))
 			goto handled;
 
-	memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
+	ether_addr_copy(search_claim.addr, ethhdr->h_source);
 	search_claim.vid = vid;
 
 	claim = batadv_claim_hash_find(bat_priv, &search_claim);
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index edee50411892..b25fd64d727b 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -277,7 +277,7 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip,
 	/* if this entry is already known, just update it */
 	if (dat_entry) {
 		if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr))
-			memcpy(dat_entry->mac_addr, mac_addr, ETH_ALEN);
+			ether_addr_copy(dat_entry->mac_addr, mac_addr);
 		dat_entry->last_update = jiffies;
 		batadv_dbg(BATADV_DBG_DAT, bat_priv,
 			   "Entry updated: %pI4 %pM (vid: %d)\n",
@@ -292,7 +292,7 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip,
 
 	dat_entry->ip = ip;
 	dat_entry->vid = vid;
-	memcpy(dat_entry->mac_addr, mac_addr, ETH_ALEN);
+	ether_addr_copy(dat_entry->mac_addr, mac_addr);
 	dat_entry->last_update = jiffies;
 	atomic_set(&dat_entry->refcount, 2);
 
@@ -1027,6 +1027,11 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 	if (!skb_new)
 		goto out;
 
+	/* the rest of the TX path assumes that the mac_header offset pointing
+	 * to the inner Ethernet header has been set, therefore reset it now.
+	 */
+	skb_reset_mac_header(skb_new);
+
 	if (vid & BATADV_VLAN_HAS_TAG)
 		skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q),
 					  vid & VLAN_VID_MASK);
diff --git a/net/batman-adv/distributed-arp-table.h b/net/batman-adv/distributed-arp-table.h
index ac9be9b67a25..d76e1d06c5b5 100644
--- a/net/batman-adv/distributed-arp-table.h
+++ b/net/batman-adv/distributed-arp-table.h
@@ -25,6 +25,9 @@
 
 #include <linux/if_arp.h>
 
+/**
+ * BATADV_DAT_ADDR_MAX - maximum address value in the DHT space
+ */
 #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
 
 void batadv_dat_status_update(struct net_device *net_dev);
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 88df9b1d552d..bcc4bea632fa 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -449,8 +449,8 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
 	frag_header.reserved = 0;
 	frag_header.no = 0;
 	frag_header.total_size = htons(skb->len);
-	memcpy(frag_header.orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	memcpy(frag_header.dest, orig_node->orig, ETH_ALEN);
+	ether_addr_copy(frag_header.orig, primary_if->net_dev->dev_addr);
+	ether_addr_copy(frag_header.dest, orig_node->orig);
 
 	/* Eat and send fragments from the tail of skb */
 	while (skb->len > max_fragment_size) {
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index d7fafc1009a0..c835e137423b 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -678,7 +678,7 @@ batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
 	if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
 		return BATADV_DHCP_NO;
 
-	ethhdr = (struct ethhdr *)skb->data;
+	ethhdr = eth_hdr(skb);
 	proto = ethhdr->h_proto;
 	*header_len += ETH_HLEN;
 
@@ -687,7 +687,7 @@ batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
 		if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
 			return BATADV_DHCP_NO;
 
-		vhdr = (struct vlan_ethhdr *)skb->data;
+		vhdr = vlan_eth_hdr(skb);
 		proto = vhdr->h_vlan_encapsulated_proto;
 		*header_len += VLAN_HLEN;
 	}
@@ -726,7 +726,7 @@ batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
 		return BATADV_DHCP_NO;
 
 	/* skb->data might have been reallocated by pskb_may_pull() */
-	ethhdr = (struct ethhdr *)skb->data;
+	ethhdr = eth_hdr(skb);
 	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
 		ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
 
@@ -763,7 +763,7 @@ batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
 		if (*p != ETH_ALEN)
 			return BATADV_DHCP_NO;
 
-		memcpy(chaddr, skb->data + chaddr_offset, ETH_ALEN);
+		ether_addr_copy(chaddr, skb->data + chaddr_offset);
 	}
 
 	return ret;
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index abb9d6e0388b..161ef8f17d2e 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -158,6 +158,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	struct batadv_orig_node *orig_node = NULL;
 	struct batadv_neigh_node *neigh_node = NULL;
 	size_t packet_len = sizeof(struct batadv_icmp_packet);
+	uint8_t *addr;
 
 	if (len < sizeof(struct batadv_icmp_header)) {
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
@@ -227,10 +228,10 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 			goto dst_unreach;
 
 		icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header;
-		if (packet_len == sizeof(*icmp_packet_rr))
-			memcpy(icmp_packet_rr->rr,
-			       neigh_node->if_incoming->net_dev->dev_addr,
-			       ETH_ALEN);
+		if (packet_len == sizeof(*icmp_packet_rr)) {
+			addr = neigh_node->if_incoming->net_dev->dev_addr;
+			ether_addr_copy(icmp_packet_rr->rr[0], addr);
+		}
 
 		break;
 	default:
@@ -250,7 +251,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 		goto free_skb;
 	}
 
-	memcpy(icmp_header->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
+	ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr);
 
 	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
 	goto out;
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 66ae135b9f27..d1183e882167 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -34,6 +34,7 @@
 #include "gateway_client.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
+#include "multicast.h"
 #include "gateway_common.h"
 #include "hash.h"
 #include "bat_algo.h"
@@ -110,6 +111,9 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	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);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	spin_lock_init(&bat_priv->mcast.want_lists_lock);
+#endif
 	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);
@@ -117,9 +121,17 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
 	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
 	INIT_HLIST_HEAD(&bat_priv->gw.list);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
+	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
+	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
+#endif
 	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
 	INIT_LIST_HEAD(&bat_priv->tt.req_list);
 	INIT_LIST_HEAD(&bat_priv->tt.roam_list);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
+#endif
 	INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
 	INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
 	INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
@@ -145,6 +157,7 @@ int batadv_mesh_init(struct net_device *soft_iface)
 		goto err;
 
 	batadv_gw_init(bat_priv);
+	batadv_mcast_init(bat_priv);
 
 	atomic_set(&bat_priv->gw.reselect, 0);
 	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
@@ -169,6 +182,8 @@ void batadv_mesh_free(struct net_device *soft_iface)
 	batadv_dat_free(bat_priv);
 	batadv_bla_free(bat_priv);
 
+	batadv_mcast_free(bat_priv);
+
 	/* Free the TT and the originator tables only after having terminated
 	 * all the other depending components which may use these structures for
 	 * their purposes.
@@ -1133,8 +1148,8 @@ void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, uint8_t *src,
 	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);
+	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;
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 9374f1a51348..770dc890ceef 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -24,7 +24,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2014.1.0"
+#define BATADV_SOURCE_VERSION "2014.2.0"
 #endif
 
 /* B.A.T.M.A.N. parameters */
@@ -176,6 +176,8 @@ enum batadv_uev_type {
 #include <linux/percpu.h>
 #include <linux/slab.h>
 #include <net/sock.h>		/* struct sock */
+#include <net/addrconf.h>	/* ipv6 address stuff */
+#include <linux/ip.h>
 #include <net/rtnetlink.h>
 #include <linux/jiffies.h>
 #include <linux/seq_file.h>
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
new file mode 100644
index 000000000000..8c7ca811de6e
--- /dev/null
+++ b/net/batman-adv/multicast.c
@@ -0,0 +1,748 @@
+/* Copyright (C) 2014 B.A.T.M.A.N. contributors:
+ *
+ * Linus Lüssing
+ *
+ * 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 "multicast.h"
+#include "originator.h"
+#include "hard-interface.h"
+#include "translation-table.h"
+#include "multicast.h"
+
+/**
+ * batadv_mcast_mla_softif_get - get softif multicast listeners
+ * @dev: the device to collect multicast addresses from
+ * @mcast_list: a list to put found addresses into
+ *
+ * Collect multicast addresses of the local multicast listeners
+ * on the given soft interface, dev, in the given mcast_list.
+ *
+ * Returns -ENOMEM on memory allocation error or the number of
+ * items added to the mcast_list otherwise.
+ */
+static int batadv_mcast_mla_softif_get(struct net_device *dev,
+				       struct hlist_head *mcast_list)
+{
+	struct netdev_hw_addr *mc_list_entry;
+	struct batadv_hw_addr *new;
+	int ret = 0;
+
+	netif_addr_lock_bh(dev);
+	netdev_for_each_mc_addr(mc_list_entry, dev) {
+		new = kmalloc(sizeof(*new), GFP_ATOMIC);
+		if (!new) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		ether_addr_copy(new->addr, mc_list_entry->addr);
+		hlist_add_head(&new->list, mcast_list);
+		ret++;
+	}
+	netif_addr_unlock_bh(dev);
+
+	return ret;
+}
+
+/**
+ * batadv_mcast_mla_is_duplicate - check whether an address is in a list
+ * @mcast_addr: the multicast address to check
+ * @mcast_list: the list with multicast addresses to search in
+ *
+ * Returns true if the given address is already in the given list.
+ * Otherwise returns false.
+ */
+static bool batadv_mcast_mla_is_duplicate(uint8_t *mcast_addr,
+					  struct hlist_head *mcast_list)
+{
+	struct batadv_hw_addr *mcast_entry;
+
+	hlist_for_each_entry(mcast_entry, mcast_list, list)
+		if (batadv_compare_eth(mcast_entry->addr, mcast_addr))
+			return true;
+
+	return false;
+}
+
+/**
+ * batadv_mcast_mla_list_free - free a list of multicast addresses
+ * @mcast_list: the list to free
+ *
+ * Removes and frees all items in the given mcast_list.
+ */
+static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
+{
+	struct batadv_hw_addr *mcast_entry;
+	struct hlist_node *tmp;
+
+	hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
+		hlist_del(&mcast_entry->list);
+		kfree(mcast_entry);
+	}
+}
+
+/**
+ * batadv_mcast_mla_tt_retract - clean up multicast listener announcements
+ * @bat_priv: the bat priv with all the soft interface information
+ * @mcast_list: a list of addresses which should _not_ be removed
+ *
+ * Retracts the announcement of any multicast listener from the
+ * translation table except the ones listed in the given mcast_list.
+ *
+ * If mcast_list is NULL then all are retracted.
+ */
+static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
+					struct hlist_head *mcast_list)
+{
+	struct batadv_hw_addr *mcast_entry;
+	struct hlist_node *tmp;
+
+	hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
+				  list) {
+		if (mcast_list &&
+		    batadv_mcast_mla_is_duplicate(mcast_entry->addr,
+						  mcast_list))
+			continue;
+
+		batadv_tt_local_remove(bat_priv, mcast_entry->addr,
+				       BATADV_NO_FLAGS,
+				       "mcast TT outdated", false);
+
+		hlist_del(&mcast_entry->list);
+		kfree(mcast_entry);
+	}
+}
+
+/**
+ * batadv_mcast_mla_tt_add - add multicast listener announcements
+ * @bat_priv: the bat priv with all the soft interface information
+ * @mcast_list: a list of addresses which are going to get added
+ *
+ * Adds multicast listener announcements from the given mcast_list to the
+ * translation table if they have not been added yet.
+ */
+static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
+				    struct hlist_head *mcast_list)
+{
+	struct batadv_hw_addr *mcast_entry;
+	struct hlist_node *tmp;
+
+	if (!mcast_list)
+		return;
+
+	hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) {
+		if (batadv_mcast_mla_is_duplicate(mcast_entry->addr,
+						  &bat_priv->mcast.mla_list))
+			continue;
+
+		if (!batadv_tt_local_add(bat_priv->soft_iface,
+					 mcast_entry->addr, BATADV_NO_FLAGS,
+					 BATADV_NULL_IFINDEX, BATADV_NO_MARK))
+			continue;
+
+		hlist_del(&mcast_entry->list);
+		hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list);
+	}
+}
+
+/**
+ * batadv_mcast_has_bridge - check whether the soft-iface is bridged
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Checks whether there is a bridge on top of our soft interface. Returns
+ * true if so, false otherwise.
+ */
+static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv)
+{
+	struct net_device *upper = bat_priv->soft_iface;
+
+	rcu_read_lock();
+	do {
+		upper = netdev_master_upper_dev_get_rcu(upper);
+	} while (upper && !(upper->priv_flags & IFF_EBRIDGE));
+	rcu_read_unlock();
+
+	return upper;
+}
+
+/**
+ * batadv_mcast_mla_tvlv_update - update multicast tvlv
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Updates the own multicast tvlv with our current multicast related settings,
+ * capabilities and inabilities.
+ *
+ * Returns true if the tvlv container is registered afterwards. Otherwise
+ * returns false.
+ */
+static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv)
+{
+	struct batadv_tvlv_mcast_data mcast_data;
+
+	mcast_data.flags = BATADV_NO_FLAGS;
+	memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
+
+	/* Avoid attaching MLAs, if there is a bridge on top of our soft
+	 * interface, we don't support that yet (TODO)
+	 */
+	if (batadv_mcast_has_bridge(bat_priv)) {
+		if (bat_priv->mcast.enabled) {
+			batadv_tvlv_container_unregister(bat_priv,
+							 BATADV_TVLV_MCAST, 1);
+			bat_priv->mcast.enabled = false;
+		}
+
+		return false;
+	}
+
+	if (!bat_priv->mcast.enabled ||
+	    mcast_data.flags != bat_priv->mcast.flags) {
+		batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 1,
+					       &mcast_data, sizeof(mcast_data));
+		bat_priv->mcast.flags = mcast_data.flags;
+		bat_priv->mcast.enabled = true;
+	}
+
+	return true;
+}
+
+/**
+ * batadv_mcast_mla_update - update the own MLAs
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Updates the own multicast listener announcements in the translation
+ * table as well as the own, announced multicast tvlv container.
+ */
+void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
+{
+	struct net_device *soft_iface = bat_priv->soft_iface;
+	struct hlist_head mcast_list = HLIST_HEAD_INIT;
+	int ret;
+
+	if (!batadv_mcast_mla_tvlv_update(bat_priv))
+		goto update;
+
+	ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list);
+	if (ret < 0)
+		goto out;
+
+update:
+	batadv_mcast_mla_tt_retract(bat_priv, &mcast_list);
+	batadv_mcast_mla_tt_add(bat_priv, &mcast_list);
+
+out:
+	batadv_mcast_mla_list_free(&mcast_list);
+}
+
+/**
+ * batadv_mcast_forw_mode_check_ipv4 - check for optimized forwarding potential
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the IPv4 packet to check
+ * @is_unsnoopable: stores whether the destination is snoopable
+ *
+ * Checks whether the given IPv4 packet has the potential to be forwarded with a
+ * mode more optimal than classic flooding.
+ *
+ * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM in case of
+ * memory allocation failure.
+ */
+static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv,
+					     struct sk_buff *skb,
+					     bool *is_unsnoopable)
+{
+	struct iphdr *iphdr;
+
+	/* We might fail due to out-of-memory -> drop it */
+	if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr)))
+		return -ENOMEM;
+
+	iphdr = ip_hdr(skb);
+
+	/* TODO: Implement Multicast Router Discovery (RFC4286),
+	 * then allow scope > link local, too
+	 */
+	if (!ipv4_is_local_multicast(iphdr->daddr))
+		return -EINVAL;
+
+	/* link-local multicast listeners behind a bridge are
+	 * not snoopable (see RFC4541, section 2.1.2.2)
+	 */
+	*is_unsnoopable = true;
+
+	return 0;
+}
+
+/**
+ * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the IPv6 packet to check
+ * @is_unsnoopable: stores whether the destination is snoopable
+ *
+ * Checks whether the given IPv6 packet has the potential to be forwarded with a
+ * mode more optimal than classic flooding.
+ *
+ * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out
+ * of memory.
+ */
+static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
+					     struct sk_buff *skb,
+					     bool *is_unsnoopable)
+{
+	struct ipv6hdr *ip6hdr;
+
+	/* We might fail due to out-of-memory -> drop it */
+	if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
+		return -ENOMEM;
+
+	ip6hdr = ipv6_hdr(skb);
+
+	/* TODO: Implement Multicast Router Discovery (RFC4286),
+	 * then allow scope > link local, too
+	 */
+	if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) != IPV6_ADDR_SCOPE_LINKLOCAL)
+		return -EINVAL;
+
+	/* link-local-all-nodes multicast listeners behind a bridge are
+	 * not snoopable (see RFC4541, section 3, paragraph 3)
+	 */
+	if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
+		*is_unsnoopable = true;
+
+	return 0;
+}
+
+/**
+ * batadv_mcast_forw_mode_check - check for optimized forwarding potential
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the multicast frame to check
+ * @is_unsnoopable: stores whether the destination is snoopable
+ *
+ * Checks whether the given multicast ethernet frame has the potential to be
+ * forwarded with a mode more optimal than classic flooding.
+ *
+ * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out
+ * of memory.
+ */
+static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
+					struct sk_buff *skb,
+					bool *is_unsnoopable)
+{
+	struct ethhdr *ethhdr = eth_hdr(skb);
+
+	if (!atomic_read(&bat_priv->multicast_mode))
+		return -EINVAL;
+
+	if (atomic_read(&bat_priv->mcast.num_disabled))
+		return -EINVAL;
+
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_IP:
+		return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb,
+							 is_unsnoopable);
+	case ETH_P_IPV6:
+		return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb,
+							 is_unsnoopable);
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * batadv_mcast_want_all_ip_count - count nodes with unspecific mcast interest
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ethhdr: ethernet header of a packet
+ *
+ * Returns the number of nodes which want all IPv4 multicast traffic if the
+ * given ethhdr is from an IPv4 packet or the number of nodes which want all
+ * IPv6 traffic if it matches an IPv6 packet.
+ */
+static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv,
+					       struct ethhdr *ethhdr)
+{
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_IP:
+		return atomic_read(&bat_priv->mcast.num_want_all_ipv4);
+	case ETH_P_IPV6:
+		return atomic_read(&bat_priv->mcast.num_want_all_ipv6);
+	default:
+		/* we shouldn't be here... */
+		return 0;
+	}
+}
+
+/**
+ * batadv_mcast_forw_tt_node_get - get a multicast tt node
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ethhdr: the ether header containing the multicast destination
+ *
+ * Returns an orig_node matching the multicast address provided by ethhdr
+ * via a translation table lookup. This increases the returned nodes refcount.
+ */
+static struct batadv_orig_node *
+batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
+			      struct ethhdr *ethhdr)
+{
+	return batadv_transtable_search(bat_priv, ethhdr->h_source,
+					ethhdr->h_dest, BATADV_NO_FLAGS);
+}
+
+/**
+ * batadv_mcast_want_forw_ipv4_node_get - get a node with an ipv4 flag
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and
+ * increases its refcount.
+ */
+static struct batadv_orig_node *
+batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
+{
+	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tmp_orig_node,
+				 &bat_priv->mcast.want_all_ipv4_list,
+				 mcast_want_all_ipv4_node) {
+		if (!atomic_inc_not_zero(&orig_node->refcount))
+			continue;
+
+		orig_node = tmp_orig_node;
+		break;
+	}
+	rcu_read_unlock();
+
+	return orig_node;
+}
+
+/**
+ * batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set
+ * and increases its refcount.
+ */
+static struct batadv_orig_node *
+batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
+{
+	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tmp_orig_node,
+				 &bat_priv->mcast.want_all_ipv6_list,
+				 mcast_want_all_ipv6_node) {
+		if (!atomic_inc_not_zero(&orig_node->refcount))
+			continue;
+
+		orig_node = tmp_orig_node;
+		break;
+	}
+	rcu_read_unlock();
+
+	return orig_node;
+}
+
+/**
+ * batadv_mcast_want_forw_ip_node_get - get a node with an ipv4/ipv6 flag
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ethhdr: an ethernet header to determine the protocol family from
+ *
+ * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or
+ * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and
+ * increases its refcount.
+ */
+static struct batadv_orig_node *
+batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv,
+			      struct ethhdr *ethhdr)
+{
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_IP:
+		return batadv_mcast_forw_ipv4_node_get(bat_priv);
+	case ETH_P_IPV6:
+		return batadv_mcast_forw_ipv6_node_get(bat_priv);
+	default:
+		/* we shouldn't be here... */
+		return NULL;
+	}
+}
+
+/**
+ * batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag
+ * set and increases its refcount.
+ */
+static struct batadv_orig_node *
+batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
+{
+	struct batadv_orig_node *tmp_orig_node, *orig_node = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tmp_orig_node,
+				 &bat_priv->mcast.want_all_unsnoopables_list,
+				 mcast_want_all_unsnoopables_node) {
+		if (!atomic_inc_not_zero(&orig_node->refcount))
+			continue;
+
+		orig_node = tmp_orig_node;
+		break;
+	}
+	rcu_read_unlock();
+
+	return orig_node;
+}
+
+/**
+ * batadv_mcast_forw_mode - check on how to forward a multicast packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: The multicast packet to check
+ * @orig: an originator to be set to forward the skb to
+ *
+ * Returns the forwarding mode as enum batadv_forw_mode and in case of
+ * BATADV_FORW_SINGLE set the orig to the single originator the skb
+ * should be forwarded to.
+ */
+enum batadv_forw_mode
+batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		       struct batadv_orig_node **orig)
+{
+	int ret, tt_count, ip_count, unsnoop_count, total_count;
+	bool is_unsnoopable = false;
+	struct ethhdr *ethhdr;
+
+	ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable);
+	if (ret == -ENOMEM)
+		return BATADV_FORW_NONE;
+	else if (ret < 0)
+		return BATADV_FORW_ALL;
+
+	ethhdr = eth_hdr(skb);
+
+	tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
+					       BATADV_NO_FLAGS);
+	ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr);
+	unsnoop_count = !is_unsnoopable ? 0 :
+			atomic_read(&bat_priv->mcast.num_want_all_unsnoopables);
+
+	total_count = tt_count + ip_count + unsnoop_count;
+
+	switch (total_count) {
+	case 1:
+		if (tt_count)
+			*orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
+		else if (ip_count)
+			*orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr);
+		else if (unsnoop_count)
+			*orig = batadv_mcast_forw_unsnoop_node_get(bat_priv);
+
+		if (*orig)
+			return BATADV_FORW_SINGLE;
+
+		/* fall through */
+	case 0:
+		return BATADV_FORW_NONE;
+	default:
+		return BATADV_FORW_ALL;
+	}
+}
+
+/**
+ * batadv_mcast_want_unsnoop_update - update unsnoop counter and list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig: the orig_node which multicast state might have changed of
+ * @mcast_flags: flags indicating the new multicast state
+ *
+ * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator,
+ * orig, has toggled then this method updates counter and list accordingly.
+ */
+static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv,
+					     struct batadv_orig_node *orig,
+					     uint8_t mcast_flags)
+{
+	/* switched from flag unset to set */
+	if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
+	    !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) {
+		atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables);
+
+		spin_lock_bh(&bat_priv->mcast.want_lists_lock);
+		hlist_add_head_rcu(&orig->mcast_want_all_unsnoopables_node,
+				   &bat_priv->mcast.want_all_unsnoopables_list);
+		spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
+	/* switched from flag set to unset */
+	} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) &&
+		   orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) {
+		atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables);
+
+		spin_lock_bh(&bat_priv->mcast.want_lists_lock);
+		hlist_del_rcu(&orig->mcast_want_all_unsnoopables_node);
+		spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
+	}
+}
+
+/**
+ * batadv_mcast_want_ipv4_update - update want-all-ipv4 counter and list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig: the orig_node which multicast state might have changed of
+ * @mcast_flags: flags indicating the new multicast state
+ *
+ * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has
+ * toggled then this method updates counter and list accordingly.
+ */
+static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv,
+					  struct batadv_orig_node *orig,
+					  uint8_t mcast_flags)
+{
+	/* switched from flag unset to set */
+	if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 &&
+	    !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) {
+		atomic_inc(&bat_priv->mcast.num_want_all_ipv4);
+
+		spin_lock_bh(&bat_priv->mcast.want_lists_lock);
+		hlist_add_head_rcu(&orig->mcast_want_all_ipv4_node,
+				   &bat_priv->mcast.want_all_ipv4_list);
+		spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
+	/* switched from flag set to unset */
+	} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) &&
+		   orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) {
+		atomic_dec(&bat_priv->mcast.num_want_all_ipv4);
+
+		spin_lock_bh(&bat_priv->mcast.want_lists_lock);
+		hlist_del_rcu(&orig->mcast_want_all_ipv4_node);
+		spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
+	}
+}
+
+/**
+ * batadv_mcast_want_ipv6_update - update want-all-ipv6 counter and list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig: the orig_node which multicast state might have changed of
+ * @mcast_flags: flags indicating the new multicast state
+ *
+ * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has
+ * toggled then this method updates counter and list accordingly.
+ */
+static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv,
+					  struct batadv_orig_node *orig,
+					  uint8_t mcast_flags)
+{
+	/* switched from flag unset to set */
+	if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 &&
+	    !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) {
+		atomic_inc(&bat_priv->mcast.num_want_all_ipv6);
+
+		spin_lock_bh(&bat_priv->mcast.want_lists_lock);
+		hlist_add_head_rcu(&orig->mcast_want_all_ipv6_node,
+				   &bat_priv->mcast.want_all_ipv6_list);
+		spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
+	/* switched from flag set to unset */
+	} else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) &&
+		   orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) {
+		atomic_dec(&bat_priv->mcast.num_want_all_ipv6);
+
+		spin_lock_bh(&bat_priv->mcast.want_lists_lock);
+		hlist_del_rcu(&orig->mcast_want_all_ipv6_node);
+		spin_unlock_bh(&bat_priv->mcast.want_lists_lock);
+	}
+}
+
+/**
+ * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig: the orig_node of the ogm
+ * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
+ * @tvlv_value: tvlv buffer containing the multicast data
+ * @tvlv_value_len: tvlv buffer length
+ */
+static void batadv_mcast_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
+					     struct batadv_orig_node *orig,
+					     uint8_t flags,
+					     void *tvlv_value,
+					     uint16_t tvlv_value_len)
+{
+	bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
+	uint8_t mcast_flags = BATADV_NO_FLAGS;
+	bool orig_initialized;
+
+	orig_initialized = orig->capa_initialized & BATADV_ORIG_CAPA_HAS_MCAST;
+
+	/* If mcast support is turned on decrease the disabled mcast node
+	 * counter only if we had increased it for this node before. If this
+	 * is a completely new orig_node no need to decrease the counter.
+	 */
+	if (orig_mcast_enabled &&
+	    !(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST)) {
+		if (orig_initialized)
+			atomic_dec(&bat_priv->mcast.num_disabled);
+		orig->capabilities |= BATADV_ORIG_CAPA_HAS_MCAST;
+	/* If mcast support is being switched off increase the disabled
+	 * mcast node counter.
+	 */
+	} else if (!orig_mcast_enabled &&
+		   orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST) {
+		atomic_inc(&bat_priv->mcast.num_disabled);
+		orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_MCAST;
+	}
+
+	orig->capa_initialized |= BATADV_ORIG_CAPA_HAS_MCAST;
+
+	if (orig_mcast_enabled && tvlv_value &&
+	    (tvlv_value_len >= sizeof(mcast_flags)))
+		mcast_flags = *(uint8_t *)tvlv_value;
+
+	batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags);
+	batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags);
+	batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags);
+
+	orig->mcast_flags = mcast_flags;
+}
+
+/**
+ * batadv_mcast_init - initialize the multicast optimizations structures
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+void batadv_mcast_init(struct batadv_priv *bat_priv)
+{
+	batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler_v1,
+				     NULL, BATADV_TVLV_MCAST, 1,
+				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
+}
+
+/**
+ * batadv_mcast_free - free the multicast optimizations structures
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+void batadv_mcast_free(struct batadv_priv *bat_priv)
+{
+	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1);
+	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1);
+
+	batadv_mcast_mla_tt_retract(bat_priv, NULL);
+}
+
+/**
+ * batadv_mcast_purge_orig - reset originator global mcast state modifications
+ * @orig: the originator which is going to get purged
+ */
+void batadv_mcast_purge_orig(struct batadv_orig_node *orig)
+{
+	struct batadv_priv *bat_priv = orig->bat_priv;
+
+	if (!(orig->capabilities & BATADV_ORIG_CAPA_HAS_MCAST))
+		atomic_dec(&bat_priv->mcast.num_disabled);
+
+	batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS);
+	batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS);
+	batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS);
+}
diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
new file mode 100644
index 000000000000..73b5d45819c1
--- /dev/null
+++ b/net/batman-adv/multicast.h
@@ -0,0 +1,80 @@
+/* Copyright (C) 2014 B.A.T.M.A.N. contributors:
+ *
+ * Linus Lüssing
+ *
+ * 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/>.
+ */
+
+#ifndef _NET_BATMAN_ADV_MULTICAST_H_
+#define _NET_BATMAN_ADV_MULTICAST_H_
+
+/**
+ * batadv_forw_mode - the way a packet should be forwarded as
+ * @BATADV_FORW_ALL: forward the packet to all nodes (currently via classic
+ *  flooding)
+ * @BATADV_FORW_SINGLE: forward the packet to a single node (currently via the
+ *  BATMAN unicast routing protocol)
+ * @BATADV_FORW_NONE: don't forward, drop it
+ */
+enum batadv_forw_mode {
+	BATADV_FORW_ALL,
+	BATADV_FORW_SINGLE,
+	BATADV_FORW_NONE,
+};
+
+#ifdef CONFIG_BATMAN_ADV_MCAST
+
+void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
+
+enum batadv_forw_mode
+batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		       struct batadv_orig_node **mcast_single_orig);
+
+void batadv_mcast_init(struct batadv_priv *bat_priv);
+
+void batadv_mcast_free(struct batadv_priv *bat_priv);
+
+void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
+
+#else
+
+static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
+{
+	return;
+}
+
+static inline enum batadv_forw_mode
+batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		       struct batadv_orig_node **mcast_single_orig)
+{
+	return BATADV_FORW_ALL;
+}
+
+static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
+{
+	return 0;
+}
+
+static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
+{
+	return;
+}
+
+static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node)
+{
+	return;
+}
+
+#endif /* CONFIG_BATMAN_ADV_MCAST */
+
+#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index f1b604d88dc3..a9546fe541eb 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -819,7 +819,7 @@ static struct batadv_nc_node
 
 	/* Initialize nc_node */
 	INIT_LIST_HEAD(&nc_node->list);
-	memcpy(nc_node->addr, orig_node->orig, ETH_ALEN);
+	ether_addr_copy(nc_node->addr, orig_node->orig);
 	nc_node->orig_node = orig_neigh_node;
 	atomic_set(&nc_node->refcount, 2);
 
@@ -941,8 +941,8 @@ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv,
 	spin_lock_init(&nc_path->packet_list_lock);
 	atomic_set(&nc_path->refcount, 2);
 	nc_path->last_valid = jiffies;
-	memcpy(nc_path->next_hop, dst, ETH_ALEN);
-	memcpy(nc_path->prev_hop, src, ETH_ALEN);
+	ether_addr_copy(nc_path->next_hop, dst);
+	ether_addr_copy(nc_path->prev_hop, src);
 
 	batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n",
 		   nc_path->prev_hop,
@@ -1114,15 +1114,15 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv,
 	coded_packet->ttl = packet1->ttl;
 
 	/* Info about first unicast packet */
-	memcpy(coded_packet->first_source, first_source, ETH_ALEN);
-	memcpy(coded_packet->first_orig_dest, packet1->dest, ETH_ALEN);
+	ether_addr_copy(coded_packet->first_source, first_source);
+	ether_addr_copy(coded_packet->first_orig_dest, packet1->dest);
 	coded_packet->first_crc = packet_id1;
 	coded_packet->first_ttvn = packet1->ttvn;
 
 	/* Info about second unicast packet */
-	memcpy(coded_packet->second_dest, second_dest, ETH_ALEN);
-	memcpy(coded_packet->second_source, second_source, ETH_ALEN);
-	memcpy(coded_packet->second_orig_dest, packet2->dest, ETH_ALEN);
+	ether_addr_copy(coded_packet->second_dest, second_dest);
+	ether_addr_copy(coded_packet->second_source, second_source);
+	ether_addr_copy(coded_packet->second_orig_dest, packet2->dest);
 	coded_packet->second_crc = packet_id2;
 	coded_packet->second_ttl = packet2->ttl;
 	coded_packet->second_ttvn = packet2->ttvn;
@@ -1349,8 +1349,8 @@ static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv,
 
 	/* Set the mac header as if we actually sent the packet uncoded */
 	ethhdr = eth_hdr(skb);
-	memcpy(ethhdr->h_source, ethhdr->h_dest, ETH_ALEN);
-	memcpy(ethhdr->h_dest, eth_dst_new, ETH_ALEN);
+	ether_addr_copy(ethhdr->h_source, ethhdr->h_dest);
+	ether_addr_copy(ethhdr->h_dest, eth_dst_new);
 
 	/* Set data pointer to MAC header to mimic packets from our tx path */
 	skb_push(skb, ETH_HLEN);
@@ -1636,7 +1636,7 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
 
 	/* Reconstruct original mac header */
 	ethhdr = eth_hdr(skb);
-	memcpy(ethhdr, &ethhdr_tmp, sizeof(*ethhdr));
+	*ethhdr = ethhdr_tmp;
 
 	/* Select the correct unicast header information based on the location
 	 * of our mac address in the coded_packet header
@@ -1646,7 +1646,7 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
 		 * so the Ethernet address must be copied to h_dest and
 		 * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST
 		 */
-		memcpy(ethhdr->h_dest, coded_packet_tmp.second_dest, ETH_ALEN);
+		ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest);
 		skb->pkt_type = PACKET_HOST;
 
 		orig_dest = coded_packet_tmp.second_orig_dest;
@@ -1682,7 +1682,7 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
 	unicast_packet->packet_type = BATADV_UNICAST;
 	unicast_packet->version = BATADV_COMPAT_VERSION;
 	unicast_packet->ttl = ttl;
-	memcpy(unicast_packet->dest, orig_dest, ETH_ALEN);
+	ether_addr_copy(unicast_packet->dest, orig_dest);
 	unicast_packet->ttvn = ttvn;
 
 	batadv_nc_packet_free(nc_packet);
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 853941629dc1..ffd9dfbd9b0e 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -27,6 +27,7 @@
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
 #include "fragmentation.h"
+#include "multicast.h"
 
 /* hash class keys */
 static struct lock_class_key batadv_orig_hash_lock_class_key;
@@ -446,7 +447,7 @@ batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
 	INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
 	spin_lock_init(&neigh_node->ifinfo_lock);
 
-	memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
+	ether_addr_copy(neigh_node->addr, neigh_addr);
 	neigh_node->if_incoming = hard_iface;
 	neigh_node->orig_node = orig_node;
 
@@ -557,6 +558,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 	}
 	spin_unlock_bh(&orig_node->neigh_list_lock);
 
+	batadv_mcast_purge_orig(orig_node);
+
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 
@@ -664,15 +667,17 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 	/* extra reference for return */
 	atomic_set(&orig_node->refcount, 2);
 
-	orig_node->tt_initialised = false;
 	orig_node->bat_priv = bat_priv;
-	memcpy(orig_node->orig, addr, ETH_ALEN);
+	ether_addr_copy(orig_node->orig, addr);
 	batadv_dat_init_orig_node_addr(orig_node);
 	atomic_set(&orig_node->last_ttvn, 0);
 	orig_node->tt_buff = NULL;
 	orig_node->tt_buff_len = 0;
 	reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 	orig_node->bcast_seqno_reset = reset_time;
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	orig_node->mcast_flags = BATADV_NO_FLAGS;
+#endif
 
 	/* create a vlan object for the "untagged" LAN */
 	vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index 0a381d1174c1..34e096d2dce1 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -89,6 +89,19 @@ enum batadv_icmp_packettype {
 	BATADV_PARAMETER_PROBLEM       = 12,
 };
 
+/**
+ * enum batadv_mcast_flags - flags for multicast capabilities and settings
+ * @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for
+ *  224.0.0.0/24 or ff02::1
+ * @BATADV_MCAST_WANT_ALL_IPV4: we want all IPv4 multicast packets
+ * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets
+ */
+enum batadv_mcast_flags {
+	BATADV_MCAST_WANT_ALL_UNSNOOPABLES	= BIT(0),
+	BATADV_MCAST_WANT_ALL_IPV4		= BIT(1),
+	BATADV_MCAST_WANT_ALL_IPV6		= BIT(2),
+};
+
 /* tt data subtypes */
 #define BATADV_TT_DATA_TYPE_MASK 0x0F
 
@@ -106,10 +119,30 @@ enum batadv_tt_data_flags {
 	BATADV_TT_FULL_TABLE = BIT(4),
 };
 
-/* BATADV_TT_CLIENT flags.
- * Flags from BIT(0) to BIT(7) are sent on the wire, while flags from BIT(8) to
- * BIT(15) are used for local computation only.
- * Flags from BIT(4) to BIT(7) are kept in sync with the rest of the network.
+/**
+ * enum batadv_tt_client_flags - TT client specific flags
+ * @BATADV_TT_CLIENT_DEL: the client has to be deleted from the table
+ * @BATADV_TT_CLIENT_ROAM: the client roamed to/from another node and the new
+ *  update telling its new real location has not been received/sent yet
+ * @BATADV_TT_CLIENT_WIFI: this client is connected through a wifi interface.
+ *  This information is used by the "AP Isolation" feature
+ * @BATADV_TT_CLIENT_ISOLA: this client is considered "isolated". This
+ *  information is used by the Extended Isolation feature
+ * @BATADV_TT_CLIENT_NOPURGE: this client should never be removed from the table
+ * @BATADV_TT_CLIENT_NEW: this client has been added to the local table but has
+ *  not been announced yet
+ * @BATADV_TT_CLIENT_PENDING: this client is marked for removal but it is kept
+ *  in the table for one more originator interval for consistency purposes
+ * @BATADV_TT_CLIENT_TEMP: this global client has been detected to be part of
+ *  the network but no nnode has already announced it
+ *
+ * Bits from 0 to 7 are called _remote flags_ because they are sent on the wire.
+ * Bits from 8 to 15 are called _local flags_ because they are used for local
+ * computations only.
+ *
+ * Bits from 4 to 7 - a subset of remote flags - are ensured to be in sync with
+ * the other nodes in the network. To achieve this goal these flags are included
+ * in the TT CRC computation.
  */
 enum batadv_tt_client_flags {
 	BATADV_TT_CLIENT_DEL     = BIT(0),
@@ -145,6 +178,7 @@ enum batadv_bla_claimframe {
  * @BATADV_TVLV_NC: network coding tvlv
  * @BATADV_TVLV_TT: translation table tvlv
  * @BATADV_TVLV_ROAM: roaming advertisement tvlv
+ * @BATADV_TVLV_MCAST: multicast capability tvlv
  */
 enum batadv_tvlv_type {
 	BATADV_TVLV_GW		= 0x01,
@@ -152,6 +186,7 @@ enum batadv_tvlv_type {
 	BATADV_TVLV_NC		= 0x03,
 	BATADV_TVLV_TT		= 0x04,
 	BATADV_TVLV_ROAM	= 0x05,
+	BATADV_TVLV_MCAST	= 0x06,
 };
 
 #pragma pack(2)
@@ -504,4 +539,14 @@ struct batadv_tvlv_roam_adv {
 	__be16 vid;
 };
 
+/**
+ * struct batadv_tvlv_mcast_data - payload of a multicast tvlv
+ * @flags: multicast flags announced by the orig node
+ * @reserved: reserved field
+ */
+struct batadv_tvlv_mcast_data {
+	uint8_t	flags;
+	uint8_t reserved[3];
+};
+
 #endif /* _NET_BATMAN_ADV_PACKET_H_ */
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index a953d5b196a3..35141534938e 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -222,8 +222,8 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 
 		icmph = (struct batadv_icmp_header *)skb->data;
 
-		memcpy(icmph->dst, icmph->orig, ETH_ALEN);
-		memcpy(icmph->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
+		ether_addr_copy(icmph->dst, icmph->orig);
+		ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr);
 		icmph->msg_type = BATADV_ECHO_REPLY;
 		icmph->ttl = BATADV_TTL;
 
@@ -276,9 +276,8 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 
 	icmp_packet = (struct batadv_icmp_packet *)skb->data;
 
-	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
-	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr,
-	       ETH_ALEN);
+	ether_addr_copy(icmp_packet->dst, icmp_packet->orig);
+	ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr);
 	icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
 	icmp_packet->ttl = BATADV_TTL;
 
@@ -341,8 +340,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 		if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
 			goto out;
 
-		memcpy(&(icmp_packet_rr->rr[icmp_packet_rr->rr_cur]),
-		       ethhdr->h_dest, ETH_ALEN);
+		ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur],
+				ethhdr->h_dest);
 		icmp_packet_rr->rr_cur++;
 	}
 
@@ -664,7 +663,7 @@ batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
 	}
 
 	/* update the packet header */
-	memcpy(unicast_packet->dest, orig_addr, ETH_ALEN);
+	ether_addr_copy(unicast_packet->dest, orig_addr);
 	unicast_packet->ttvn = orig_ttvn;
 
 	ret = true;
@@ -774,7 +773,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
 	if (!primary_if)
 		return 0;
 
-	memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN);
+	ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
 
 	batadv_hardif_free_ref(primary_if);
 
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 843febd1e519..3d64ed20c393 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -27,6 +27,7 @@
 #include "originator.h"
 #include "network-coding.h"
 #include "fragmentation.h"
+#include "multicast.h"
 
 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 
@@ -59,8 +60,8 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 	skb_reset_mac_header(skb);
 
 	ethhdr = eth_hdr(skb);
-	memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
-	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
+	ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr);
+	ether_addr_copy(ethhdr->h_dest, dst_addr);
 	ethhdr->h_proto = htons(ETH_P_BATMAN);
 
 	skb_set_network_header(skb, ETH_HLEN);
@@ -165,7 +166,7 @@ batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
 	/* set unicast ttl */
 	unicast_packet->ttl = BATADV_TTL;
 	/* copy the destination for faster routing */
-	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
+	ether_addr_copy(unicast_packet->dest, orig_node->orig);
 	/* set the destination tt version number */
 	unicast_packet->ttvn = ttvn;
 
@@ -220,7 +221,7 @@ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
 
 	uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
 	uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
-	memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
+	ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr);
 	uc_4addr_packet->subtype = packet_subtype;
 	uc_4addr_packet->reserved = 0;
 
@@ -248,15 +249,15 @@ out:
  *
  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
  */
-static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
-				   struct sk_buff *skb, int packet_type,
-				   int packet_subtype,
-				   struct batadv_orig_node *orig_node,
-				   unsigned short vid)
+int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+			    struct sk_buff *skb, int packet_type,
+			    int packet_subtype,
+			    struct batadv_orig_node *orig_node,
+			    unsigned short vid)
 {
 	struct ethhdr *ethhdr;
 	struct batadv_unicast_packet *unicast_packet;
-	int ret = NET_XMIT_DROP, hdr_size;
+	int ret = NET_XMIT_DROP;
 
 	if (!orig_node)
 		goto out;
@@ -265,16 +266,12 @@ static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
 	case BATADV_UNICAST:
 		if (!batadv_send_skb_prepare_unicast(skb, orig_node))
 			goto out;
-
-		hdr_size = sizeof(*unicast_packet);
 		break;
 	case BATADV_UNICAST_4ADDR:
 		if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
 							   orig_node,
 							   packet_subtype))
 			goto out;
-
-		hdr_size = sizeof(struct batadv_unicast_4addr_packet);
 		break;
 	default:
 		/* this function supports UNICAST and UNICAST_4ADDR only. It
@@ -283,7 +280,10 @@ static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
 		goto out;
 	}
 
-	ethhdr = (struct ethhdr *)(skb->data + hdr_size);
+	/* skb->data might have been reallocated by
+	 * batadv_send_skb_prepare_unicast{,_4addr}()
+	 */
+	ethhdr = eth_hdr(skb);
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
 
 	/* inform the destination node that we are still missing a correct route
@@ -312,6 +312,7 @@ out:
  * @packet_type: the batman unicast packet type to use
  * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
  *  4addr packets)
+ * @dst_hint: can be used to override the destination contained in the skb
  * @vid: the vid to be used to search the translation table
  *
  * Look up the recipient node for the destination address in the ethernet
diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h
index aaddaa9661ce..38d0ec1833ae 100644
--- a/net/batman-adv/send.h
+++ b/net/batman-adv/send.h
@@ -36,6 +36,11 @@ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
 					   struct sk_buff *skb,
 					   struct batadv_orig_node *orig_node,
 					   int packet_subtype);
+int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+			    struct sk_buff *skb, int packet_type,
+			    int packet_subtype,
+			    struct batadv_orig_node *orig_node,
+			    unsigned short vid);
 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
 				   struct sk_buff *skb, int packet_type,
 				   int packet_subtype, uint8_t *dst_hint,
@@ -47,6 +52,7 @@ int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
  * batadv_send_skb_via_tt - send an skb via TT lookup
  * @bat_priv: the bat priv with all the soft interface information
  * @skb: the payload to send
+ * @dst_hint: can be used to override the destination contained in the skb
  * @vid: the vid to be used to search the translation table
  *
  * Look up the recipient node for the destination address in the ethernet
@@ -68,6 +74,7 @@ static inline int batadv_send_skb_via_tt(struct batadv_priv *bat_priv,
  * @bat_priv: the bat priv with all the soft interface information
  * @skb: the payload to send
  * @packet_subtype: the unicast 4addr packet subtype to use
+ * @dst_hint: can be used to override the destination contained in the skb
  * @vid: the vid to be used to search the translation table
  *
  * Look up the recipient node for the destination address in the ethernet
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index f82c267e1886..744a59b85e15 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -32,6 +32,7 @@
 #include <linux/ethtool.h>
 #include <linux/etherdevice.h>
 #include <linux/if_vlan.h>
+#include "multicast.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
 
@@ -111,8 +112,8 @@ static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	memcpy(old_addr, dev->dev_addr, ETH_ALEN);
-	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+	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) {
@@ -170,17 +171,19 @@ static int batadv_interface_tx(struct sk_buff *skb,
 	unsigned short vid;
 	uint32_t seqno;
 	int gw_mode;
+	enum batadv_forw_mode forw_mode;
+	struct batadv_orig_node *mcast_single_orig = NULL;
 
 	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 		goto dropped;
 
 	soft_iface->trans_start = jiffies;
 	vid = batadv_get_vid(skb, 0);
-	ethhdr = (struct ethhdr *)skb->data;
+	ethhdr = eth_hdr(skb);
 
 	switch (ntohs(ethhdr->h_proto)) {
 	case ETH_P_8021Q:
-		vhdr = (struct vlan_ethhdr *)skb->data;
+		vhdr = vlan_eth_hdr(skb);
 
 		if (vhdr->h_vlan_encapsulated_proto != ethertype)
 			break;
@@ -194,7 +197,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 		goto dropped;
 
 	/* skb->data might have been reallocated by batadv_bla_tx() */
-	ethhdr = (struct ethhdr *)skb->data;
+	ethhdr = eth_hdr(skb);
 
 	/* Register the client MAC in the transtable */
 	if (!is_multicast_ether_addr(ethhdr->h_source)) {
@@ -230,7 +233,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 		/* skb->data may have been modified by
 		 * batadv_gw_dhcp_recipient_get()
 		 */
-		ethhdr = (struct ethhdr *)skb->data;
+		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
 		 */
@@ -247,9 +250,19 @@ static int batadv_interface_tx(struct sk_buff *skb,
 			 * 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 */
@@ -279,8 +292,8 @@ send:
 		/* hw address of first interface is the orig mac because only
 		 * this mac is known throughout the mesh
 		 */
-		memcpy(bcast_packet->orig,
-		       primary_if->net_dev->dev_addr, ETH_ALEN);
+		ether_addr_copy(bcast_packet->orig,
+				primary_if->net_dev->dev_addr);
 
 		/* set broadcast sequence number */
 		seqno = atomic_inc_return(&bat_priv->bcast_seqno);
@@ -301,6 +314,10 @@ send:
 			if (ret)
 				goto dropped;
 			ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
+		} else if (mcast_single_orig) {
+			ret = batadv_send_skb_unicast(bat_priv, skb,
+						      BATADV_UNICAST, 0,
+						      mcast_single_orig, vid);
 		} else {
 			if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 								  skb))
@@ -652,10 +669,7 @@ static void batadv_softif_destroy_finish(struct work_struct *work)
 	}
 
 	batadv_sysfs_del_meshif(soft_iface);
-
-	rtnl_lock();
-	unregister_netdevice(soft_iface);
-	rtnl_unlock();
+	unregister_netdev(soft_iface);
 }
 
 /**
@@ -692,6 +706,14 @@ static int batadv_softif_init_late(struct net_device *dev)
 #ifdef CONFIG_BATMAN_ADV_DAT
 	atomic_set(&bat_priv->distributed_arp_table, 1);
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	bat_priv->mcast.flags = BATADV_NO_FLAGS;
+	atomic_set(&bat_priv->multicast_mode, 1);
+	atomic_set(&bat_priv->mcast.num_disabled, 0);
+	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_sel_class, 20);
 	atomic_set(&bat_priv->gw.bandwidth_down, 100);
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c
index e456bf6bb284..1ebb0d9e2ea5 100644
--- a/net/batman-adv/sysfs.c
+++ b/net/batman-adv/sysfs.c
@@ -539,6 +539,9 @@ BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE,
 		     batadv_post_gw_reselect);
 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 		   batadv_store_gw_bwidth);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
+#endif
 #ifdef CONFIG_BATMAN_ADV_DEBUG
 BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL);
 #endif
@@ -558,6 +561,9 @@ static struct batadv_attribute *batadv_mesh_attrs[] = {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	&batadv_attr_distributed_arp_table,
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	&batadv_attr_multicast_mode,
+#endif
 	&batadv_attr_fragmentation,
 	&batadv_attr_routing_algo,
 	&batadv_attr_gw_mode,
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 959dde721c46..d636bde72c9a 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -24,6 +24,7 @@
 #include "originator.h"
 #include "routing.h"
 #include "bridge_loop_avoidance.h"
+#include "multicast.h"
 
 #include <linux/crc32c.h>
 
@@ -96,7 +97,7 @@ batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
 	if (!hash)
 		return NULL;
 
-	memcpy(to_search.addr, addr, ETH_ALEN);
+	ether_addr_copy(to_search.addr, addr);
 	to_search.vid = vid;
 
 	index = batadv_choose_tt(&to_search, hash->size);
@@ -192,6 +193,31 @@ batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 	}
 }
 
+/**
+ * batadv_tt_global_hash_count - count the number of orig entries
+ * @hash: hash table containing the tt entries
+ * @addr: the mac address of the client to count entries for
+ * @vid: VLAN identifier
+ *
+ * Return the number of originators advertising the given address/data
+ * (excluding ourself).
+ */
+int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
+				const uint8_t *addr, unsigned short vid)
+{
+	struct batadv_tt_global_entry *tt_global_entry;
+	int count;
+
+	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
+	if (!tt_global_entry)
+		return 0;
+
+	count = atomic_read(&tt_global_entry->orig_list_count);
+	batadv_tt_global_entry_free_ref(tt_global_entry);
+
+	return count;
+}
+
 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 {
 	struct batadv_tt_orig_list_entry *orig_entry;
@@ -333,7 +359,7 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 	tt_change_node->change.flags = flags;
 	memset(tt_change_node->change.reserved, 0,
 	       sizeof(tt_change_node->change.reserved));
-	memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
+	ether_addr_copy(tt_change_node->change.addr, common->addr);
 	tt_change_node->change.vid = htons(common->vid);
 
 	del_op_requested = flags & BATADV_TT_CLIENT_DEL;
@@ -484,7 +510,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 {
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	struct batadv_tt_local_entry *tt_local;
-	struct batadv_tt_global_entry *tt_global;
+	struct batadv_tt_global_entry *tt_global = NULL;
 	struct net_device *in_dev = NULL;
 	struct hlist_head *head;
 	struct batadv_tt_orig_list_entry *orig_entry;
@@ -497,7 +523,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 		in_dev = dev_get_by_index(&init_net, ifindex);
 
 	tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
-	tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
+
+	if (!is_multicast_ether_addr(addr))
+		tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 
 	if (tt_local) {
 		tt_local->last_seen = jiffies;
@@ -549,7 +577,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 		   addr, BATADV_PRINT_VID(vid),
 		   (uint8_t)atomic_read(&bat_priv->tt.vn));
 
-	memcpy(tt_local->common.addr, addr, ETH_ALEN);
+	ether_addr_copy(tt_local->common.addr, addr);
 	/* The local entry has to be marked as NEW to avoid to send it in
 	 * a full table response going out before the next ttvn increment
 	 * (consistency check)
@@ -562,8 +590,11 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 	tt_local->last_seen = jiffies;
 	tt_local->common.added_at = tt_local->last_seen;
 
-	/* the batman interface mac address should never be purged */
-	if (batadv_compare_eth(addr, soft_iface->dev_addr))
+	/* the batman interface mac and multicast addresses should never be
+	 * purged
+	 */
+	if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
+	    is_multicast_ether_addr(addr))
 		tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 
 	hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
@@ -1219,6 +1250,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
 	hlist_add_head_rcu(&orig_entry->list,
 			   &tt_global->orig_list);
 	spin_unlock_bh(&tt_global->list_lock);
+	atomic_inc(&tt_global->orig_list_count);
+
 out:
 	if (orig_entry)
 		batadv_tt_orig_list_entry_free_ref(orig_entry);
@@ -1277,7 +1310,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
 			goto out;
 
 		common = &tt_global_entry->common;
-		memcpy(common->addr, tt_addr, ETH_ALEN);
+		ether_addr_copy(common->addr, tt_addr);
 		common->vid = vid;
 
 		common->flags = flags;
@@ -1292,6 +1325,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
 		common->added_at = jiffies;
 
 		INIT_HLIST_HEAD(&tt_global_entry->orig_list);
+		atomic_set(&tt_global_entry->orig_list_count, 0);
 		spin_lock_init(&tt_global_entry->list_lock);
 
 		hash_added = batadv_hash_add(bat_priv->tt.global_hash,
@@ -1361,6 +1395,11 @@ add_orig_entry:
 	ret = true;
 
 out_remove:
+	/* Do not remove multicast addresses from the local hash on
+	 * global additions
+	 */
+	if (is_multicast_ether_addr(tt_addr))
+		goto out;
 
 	/* remove address from local hash if present */
 	local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
@@ -1552,6 +1591,25 @@ out:
 	return 0;
 }
 
+/**
+ * batadv_tt_global_del_orig_entry - remove and free an orig_entry
+ * @tt_global_entry: the global entry to remove the orig_entry from
+ * @orig_entry: the orig entry to remove and free
+ *
+ * Remove an orig_entry from its list in the given tt_global_entry and
+ * free this orig_entry afterwards.
+ */
+static void
+batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
+				struct batadv_tt_orig_list_entry *orig_entry)
+{
+	batadv_tt_global_size_dec(orig_entry->orig_node,
+				  tt_global_entry->common.vid);
+	atomic_dec(&tt_global_entry->orig_list_count);
+	hlist_del_rcu(&orig_entry->list);
+	batadv_tt_orig_list_entry_free_ref(orig_entry);
+}
+
 /* deletes the orig list of a tt_global_entry */
 static void
 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
@@ -1562,20 +1620,26 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
 
 	spin_lock_bh(&tt_global_entry->list_lock);
 	head = &tt_global_entry->orig_list;
-	hlist_for_each_entry_safe(orig_entry, safe, head, list) {
-		hlist_del_rcu(&orig_entry->list);
-		batadv_tt_global_size_dec(orig_entry->orig_node,
-					  tt_global_entry->common.vid);
-		batadv_tt_orig_list_entry_free_ref(orig_entry);
-	}
+	hlist_for_each_entry_safe(orig_entry, safe, head, list)
+		batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
 	spin_unlock_bh(&tt_global_entry->list_lock);
 }
 
+/**
+ * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tt_global_entry: the global entry to remove the orig_node from
+ * @orig_node: the originator announcing the client
+ * @message: message to append to the log on deletion
+ *
+ * Remove the given orig_node and its according orig_entry from the given
+ * global tt entry.
+ */
 static void
-batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
-				struct batadv_tt_global_entry *tt_global_entry,
-				struct batadv_orig_node *orig_node,
-				const char *message)
+batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
+			       struct batadv_tt_global_entry *tt_global_entry,
+			       struct batadv_orig_node *orig_node,
+			       const char *message)
 {
 	struct hlist_head *head;
 	struct hlist_node *safe;
@@ -1592,10 +1656,8 @@ batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
 				   orig_node->orig,
 				   tt_global_entry->common.addr,
 				   BATADV_PRINT_VID(vid), message);
-			hlist_del_rcu(&orig_entry->list);
-			batadv_tt_global_size_dec(orig_node,
-						  tt_global_entry->common.vid);
-			batadv_tt_orig_list_entry_free_ref(orig_entry);
+			batadv_tt_global_del_orig_entry(tt_global_entry,
+							orig_entry);
 		}
 	}
 	spin_unlock_bh(&tt_global_entry->list_lock);
@@ -1637,8 +1699,8 @@ batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
 		/* there is another entry, we can simply delete this
 		 * one and can still use the other one.
 		 */
-		batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
-						orig_node, message);
+		batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
+					       orig_node, message);
 }
 
 /**
@@ -1664,8 +1726,8 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 		goto out;
 
 	if (!roaming) {
-		batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
-						orig_node, message);
+		batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
+					       orig_node, message);
 
 		if (hlist_empty(&tt_global_entry->orig_list))
 			batadv_tt_global_free(bat_priv, tt_global_entry,
@@ -1748,8 +1810,8 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 						 struct batadv_tt_global_entry,
 						 common);
 
-			batadv_tt_global_del_orig_entry(bat_priv, tt_global,
-							orig_node, message);
+			batadv_tt_global_del_orig_node(bat_priv, tt_global,
+						       orig_node, message);
 
 			if (hlist_empty(&tt_global->orig_list)) {
 				vid = tt_global->common.vid;
@@ -1763,7 +1825,7 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 		}
 		spin_unlock_bh(list_lock);
 	}
-	orig_node->tt_initialised = false;
+	orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
 }
 
 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
@@ -2160,7 +2222,7 @@ batadv_new_tt_req_node(struct batadv_priv *bat_priv,
 	if (!tt_req_node)
 		goto unlock;
 
-	memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
+	ether_addr_copy(tt_req_node->addr, orig_node->orig);
 	tt_req_node->issued_at = jiffies;
 
 	list_add(&tt_req_node->list, &bat_priv->tt.req_list);
@@ -2240,8 +2302,7 @@ static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
 			if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
 				continue;
 
-			memcpy(tt_change->addr, tt_common_entry->addr,
-			       ETH_ALEN);
+			ether_addr_copy(tt_change->addr, tt_common_entry->addr);
 			tt_change->flags = tt_common_entry->flags;
 			tt_change->vid = htons(tt_common_entry->vid);
 			memset(tt_change->reserved, 0,
@@ -2724,7 +2785,7 @@ static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
 				return;
 		}
 	}
-	orig_node->tt_initialised = true;
+	orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
 }
 
 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
@@ -2932,7 +2993,7 @@ static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
 		tt_roam_node->first_time = jiffies;
 		atomic_set(&tt_roam_node->counter,
 			   BATADV_ROAMING_MAX_COUNT - 1);
-		memcpy(tt_roam_node->addr, client, ETH_ALEN);
+		ether_addr_copy(tt_roam_node->addr, client);
 
 		list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
 		ret = true;
@@ -3121,6 +3182,9 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
  */
 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
 {
+	/* Update multicast addresses in local translation table */
+	batadv_mcast_mla_update(bat_priv);
+
 	if (atomic_read(&bat_priv->tt.local_changes) < 1) {
 		if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
 			batadv_tt_tvlv_container_update(bat_priv);
@@ -3211,13 +3275,15 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 	uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
 	struct batadv_tvlv_tt_vlan_data *tt_vlan;
 	bool full_table = true;
+	bool has_tt_init;
 
 	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
+	has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
+
 	/* orig table not initialised AND first diff is in the OGM OR the ttvn
 	 * increased by one -> we can apply the attached changes
 	 */
-	if ((!orig_node->tt_initialised && ttvn == 1) ||
-	    ttvn - orig_ttvn == 1) {
+	if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
 		/* the OGM could not contain the changes due to their size or
 		 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
 		 * times.
@@ -3257,7 +3323,7 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 		/* if we missed more than one change or our tables are not
 		 * in sync anymore -> request fresh tt data
 		 */
-		if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
+		if (!has_tt_init || ttvn != orig_ttvn ||
 		    !batadv_tt_global_check_crc(orig_node, tt_vlan,
 						tt_num_vlan)) {
 request_table:
diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index 20a1d7861ded..ad84d7b89e39 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -29,6 +29,8 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
 			       int32_t match_vid, const char *message);
+int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
+				const uint8_t *addr, unsigned short vid);
 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
 						  const uint8_t *src,
 						  const uint8_t *addr,
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 78370ab31f9c..34891a56773f 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -24,8 +24,9 @@
 
 #ifdef CONFIG_BATMAN_ADV_DAT
 
-/* batadv_dat_addr_t is the type used for all DHT addresses. If it is changed,
- * BATADV_DAT_ADDR_MAX is changed as well.
+/**
+ * batadv_dat_addr_t - it is the type used for all DHT addresses. If it is
+ *  changed, BATADV_DAT_ADDR_MAX is changed as well.
  *
  * *Please be careful: batadv_dat_addr_t must be UNSIGNED*
  */
@@ -163,7 +164,7 @@ struct batadv_vlan_tt {
 };
 
 /**
- * batadv_orig_node_vlan - VLAN specific data per orig_node
+ * struct batadv_orig_node_vlan - VLAN specific data per orig_node
  * @vid: the VLAN identifier
  * @tt: VLAN specific TT attributes
  * @list: list node for orig_node::vlan_list
@@ -204,14 +205,18 @@ struct batadv_orig_bat_iv {
  * @batadv_dat_addr_t:  address of the orig node in the distributed hash
  * @last_seen: time when last packet from this node was received
  * @bcast_seqno_reset: time when the broadcast seqno window was reset
+ * @mcast_flags: multicast flags announced by the orig node
+ * @mcast_want_all_unsnoop_node: a list node for the
+ *  mcast.want_all_unsnoopables list
+ * @mcast_want_all_ipv4_node: a list node for the mcast.want_all_ipv4 list
+ * @mcast_want_all_ipv6_node: a list node for the mcast.want_all_ipv6 list
  * @capabilities: announced capabilities of this originator
+ * @capa_initialized: bitfield to remember whether a capability was initialized
  * @last_ttvn: last seen translation table version number
  * @tt_buff: last tt changeset this node received from the orig node
  * @tt_buff_len: length of the last tt changeset this node received from the
  *  orig node
  * @tt_buff_lock: lock that protects tt_buff and tt_buff_len
- * @tt_initialised: bool keeping track of whether or not this node have received
- *  any translation table information from the orig node yet
  * @tt_lock: prevents from updating the table while reading it. Table update is
  *  made up by two operations (data structure update and metdata -CRC/TTVN-
  *  recalculation) and they have to be executed atomically in order to avoid
@@ -247,12 +252,18 @@ struct batadv_orig_node {
 #endif
 	unsigned long last_seen;
 	unsigned long bcast_seqno_reset;
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	uint8_t mcast_flags;
+	struct hlist_node mcast_want_all_unsnoopables_node;
+	struct hlist_node mcast_want_all_ipv4_node;
+	struct hlist_node mcast_want_all_ipv6_node;
+#endif
 	uint8_t capabilities;
+	uint8_t capa_initialized;
 	atomic_t last_ttvn;
 	unsigned char *tt_buff;
 	int16_t tt_buff_len;
 	spinlock_t tt_buff_lock; /* protects tt_buff & tt_buff_len */
-	bool tt_initialised;
 	/* prevents from changing the table while reading it */
 	spinlock_t tt_lock;
 	DECLARE_BITMAP(bcast_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);
@@ -282,10 +293,15 @@ struct batadv_orig_node {
  * enum batadv_orig_capabilities - orig node capabilities
  * @BATADV_ORIG_CAPA_HAS_DAT: orig node has distributed arp table enabled
  * @BATADV_ORIG_CAPA_HAS_NC: orig node has network coding enabled
+ * @BATADV_ORIG_CAPA_HAS_TT: orig node has tt capability
+ * @BATADV_ORIG_CAPA_HAS_MCAST: orig node has some multicast capability
+ *  (= orig node announces a tvlv of type BATADV_TVLV_MCAST)
  */
 enum batadv_orig_capabilities {
 	BATADV_ORIG_CAPA_HAS_DAT = BIT(0),
 	BATADV_ORIG_CAPA_HAS_NC = BIT(1),
+	BATADV_ORIG_CAPA_HAS_TT = BIT(2),
+	BATADV_ORIG_CAPA_HAS_MCAST = BIT(3),
 };
 
 /**
@@ -334,7 +350,7 @@ struct batadv_neigh_node {
 };
 
 /**
- * struct batadv_neigh_node_bat_iv - neighbor information per outgoing
+ * struct batadv_neigh_ifinfo_bat_iv - neighbor information per outgoing
  *  interface for BATMAN IV
  * @tq_recv: ring buffer of received TQ values from this neigh node
  * @tq_index: ring buffer index
@@ -544,7 +560,7 @@ struct batadv_priv_bla {
 #endif
 
 /**
- * struct batadv_debug_log - debug logging data
+ * struct batadv_priv_debug_log - debug logging data
  * @log_buff: buffer holding the logs (ring bufer)
  * @log_start: index of next character to read
  * @log_end: index of next character to write
@@ -607,6 +623,39 @@ struct batadv_priv_dat {
 };
 #endif
 
+#ifdef CONFIG_BATMAN_ADV_MCAST
+/**
+ * struct batadv_priv_mcast - per mesh interface mcast data
+ * @mla_list: list of multicast addresses we are currently announcing via TT
+ * @want_all_unsnoopables_list: a list of orig_nodes wanting all unsnoopable
+ *  multicast traffic
+ * @want_all_ipv4_list: a list of orig_nodes wanting all IPv4 multicast traffic
+ * @want_all_ipv6_list: a list of orig_nodes wanting all IPv6 multicast traffic
+ * @flags: the flags we have last sent in our mcast tvlv
+ * @enabled: whether the multicast tvlv is currently enabled
+ * @num_disabled: number of nodes that have no mcast tvlv
+ * @num_want_all_unsnoopables: number of nodes wanting unsnoopable IP traffic
+ * @num_want_all_ipv4: counter for items in want_all_ipv4_list
+ * @num_want_all_ipv6: counter for items in want_all_ipv6_list
+ * @want_lists_lock: lock for protecting modifications to mcast want lists
+ *  (traversals are rcu-locked)
+ */
+struct batadv_priv_mcast {
+	struct hlist_head mla_list;
+	struct hlist_head want_all_unsnoopables_list;
+	struct hlist_head want_all_ipv4_list;
+	struct hlist_head want_all_ipv6_list;
+	uint8_t flags;
+	bool enabled;
+	atomic_t num_disabled;
+	atomic_t num_want_all_unsnoopables;
+	atomic_t num_want_all_ipv4;
+	atomic_t num_want_all_ipv6;
+	/* protects want_all_{unsnoopables,ipv4,ipv6}_list */
+	spinlock_t want_lists_lock;
+};
+#endif
+
 /**
  * struct batadv_priv_nc - per mesh interface network coding private data
  * @work: work queue callback item for cleanup
@@ -672,6 +721,8 @@ struct batadv_softif_vlan {
  *  enabled
  * @distributed_arp_table: bool indicating whether distributed ARP table is
  *  enabled
+ * @multicast_mode: Enable or disable multicast optimizations on this node's
+ *  sender/originating side
  * @gw_mode: gateway operation: off, client or server (see batadv_gw_modes)
  * @gw_sel_class: gateway selection class (applies if gw_mode client)
  * @orig_interval: OGM broadcast interval in milliseconds
@@ -702,6 +753,7 @@ struct batadv_softif_vlan {
  * @tt: translation table data
  * @tvlv: type-version-length-value data
  * @dat: distributed arp table data
+ * @mcast: multicast data
  * @network_coding: bool indicating whether network coding is enabled
  * @batadv_priv_nc: network coding data
  */
@@ -721,6 +773,9 @@ struct batadv_priv {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	atomic_t distributed_arp_table;
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	atomic_t multicast_mode;
+#endif
 	atomic_t gw_mode;
 	atomic_t gw_sel_class;
 	atomic_t orig_interval;
@@ -759,6 +814,9 @@ struct batadv_priv {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	struct batadv_priv_dat dat;
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	struct batadv_priv_mcast mcast;
+#endif
 #ifdef CONFIG_BATMAN_ADV_NC
 	atomic_t network_coding;
 	struct batadv_priv_nc nc;
@@ -881,12 +939,14 @@ struct batadv_tt_local_entry {
  * struct batadv_tt_global_entry - translation table global entry data
  * @common: general translation table data
  * @orig_list: list of orig nodes announcing this non-mesh client
+ * @orig_list_count: number of items in the orig_list
  * @list_lock: lock protecting orig_list
  * @roam_at: time at which TT_GLOBAL_ROAM was set
  */
 struct batadv_tt_global_entry {
 	struct batadv_tt_common_entry common;
 	struct hlist_head orig_list;
+	atomic_t orig_list_count;
 	spinlock_t list_lock;	/* protects orig_list */
 	unsigned long roam_at;
 };
@@ -1004,8 +1064,8 @@ struct batadv_nc_packet {
 };
 
 /**
- * batadv_skb_cb - control buffer structure used to store private data relevant
- *  to batman-adv in the skb->cb buffer in skbs.
+ * struct batadv_skb_cb - control buffer structure used to store private data
+ *  relevant to batman-adv in the skb->cb buffer in skbs.
  * @decoded: Marks a skb as decoded, which is checked when searching for coding
  *  opportunities in network-coding.c
  */
@@ -1116,6 +1176,16 @@ struct batadv_dat_entry {
 };
 
 /**
+ * struct batadv_hw_addr - a list entry for a MAC address
+ * @list: list node for the linking of entries
+ * @addr: the MAC address of this list entry
+ */
+struct batadv_hw_addr {
+	struct hlist_node list;
+	unsigned char addr[ETH_ALEN];
+};
+
+/**
  * struct batadv_dat_candidate - candidate destination for DAT operations
  * @type: the type of the selected candidate. It can one of the following:
  *	  - BATADV_DAT_CANDIDATE_NOT_FOUND