net: bridge: multicast: add EHT include and exclude handling

Add support for IGMPv3/MLDv2 include and exclude EHT handling. Similar to
how the reports are processed we have 2 cases when the group is in include
or exclude mode, these are processed as follows:
 - group include
  - is_include: create missing entries
  - to_include: flush existing entries and create a new set from the
    report, obviously if the src set is empty then we delete the group

 - group exclude
  - is_exclude: create missing entries
  - to_exclude: flush existing entries and create a new set from the
    report, any empty source set entries are removed

If the group is in a different mode then we just flush all entries reported
by the host and we create a new set with the new mode entries created from
the report. If the report is include type, the source list is empty and
the group has empty sources' set then we remove it. Any source set entries
which are empty are removed as well. If the group is in exclude mode it
can exist without any S,G entries (allowing for all traffic to pass).

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/bridge/br_private_mcast_eht.h b/net/bridge/br_private_mcast_eht.h
index 92933822301d..9daffa3ad8d5 100644
--- a/net/bridge/br_private_mcast_eht.h
+++ b/net/bridge/br_private_mcast_eht.h
@@ -55,4 +55,11 @@ bool br_multicast_eht_handle(struct net_bridge_port_group *pg,
 			     size_t addr_size,
 			     int grec_type);
 
+static inline bool
+br_multicast_eht_should_del_pg(const struct net_bridge_port_group *pg)
+{
+	return !!((pg->key.port->flags & BR_MULTICAST_FAST_LEAVE) &&
+		  RB_EMPTY_ROOT(&pg->eht_host_tree));
+}
+
 #endif /* _BR_PRIVATE_MCAST_EHT_H_ */