batman-adv: Modified forwarding behaviour for multicast packets

With this patch a multicast packet is not always simply flooded anymore,
the behaviour for the following cases is changed to reduce
unnecessary overhead:

If all nodes within the horizon of a certain node have signalized
multicast listener announcement capability then an IPv6 multicast packet
with a destination of IPv6 link-local scope (excluding ff02::1) coming
from the upstream of this node...

* ...is dropped if there is no according multicast listener in the
  translation table,
* ...is forwarded via unicast if there is a single node with interested
  multicast listeners
* ...and otherwise still gets flooded.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index ce163d50e5d7..8bee5e8536b7 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -248,11 +248,11 @@ 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;