batman-adv: Add IPv4 link-local/IPv6-ll-all-nodes multicast support

With this patch a node may additionally perform the dropping or
unicasting behaviour for a link-local IPv4 and link-local-all-nodes
IPv6 multicast packet, too.

The extra counter and BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag is needed
because with a future bridge snooping support integration a node with a
bridge on top of its soft interface is not able to reliably detect its
multicast listeners for IPv4 link-local and the IPv6
link-local-all-nodes addresses anymore (see RFC4541, section 2.1.2.2
and section 3).

Even though this new flag does make "no difference" now, it'll ensure
a seamless integration of multicast bridge support without needing to
break compatibility later.

Also note, that even with multicast bridge support it won't be possible
to optimize 224.0.0.x and ff02::1 towards nodes with bridges, they will
always receive these ranges.

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, 1 insertions, 0 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 1a643fe647e1..db6fecaddb9c 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -710,6 +710,7 @@ static int batadv_softif_init_late(struct net_device *dev)
         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);
 #endif
         atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
         atomic_set(&bat_priv->gw_sel_class, 20);