net: bridge: multicast: add EHT host filter_mode handling

We should be able to handle host filter mode changing. For exclude mode
we must create a zero-src entry so the group will be kept even without
any S,G entries (non-zero source sets). That entry doesn't count to the
entry limit and can always be created, its timer is refreshed on new
exclude reports and if we change the host filter mode to include then it
gets removed and we rely only on the non-zero source sets.
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/bridge/br_multicast_eht.c

@@ -381,6 +381,30 @@ static void br_multicast_ip_src_to_eht_addr(const struct br_ip *src,
 	}
 }
 
+static void br_eht_convert_host_filter_mode(struct net_bridge_port_group *pg,
+					    union net_bridge_eht_addr *h_addr,
+					    int filter_mode)
+{
+	struct net_bridge_group_eht_host *eht_host;
+	union net_bridge_eht_addr zero_addr;
+
+	eht_host = br_multicast_eht_host_lookup(pg, h_addr);
+	if (eht_host)
+		eht_host->filter_mode = filter_mode;
+
+	memset(&zero_addr, 0, sizeof(zero_addr));
+	switch (filter_mode) {
+	case MCAST_INCLUDE:
+		br_multicast_del_eht_set_entry(pg, &zero_addr, h_addr);
+		break;
+	case MCAST_EXCLUDE:
+		br_multicast_create_eht_set_entry(pg, &zero_addr, h_addr,
+						  MCAST_EXCLUDE,
+						  true);
+		break;
+	}
+}
+
 static void br_multicast_create_eht_set_entry(struct net_bridge_port_group *pg,
 					      union net_bridge_eht_addr *src_addr,
 					      union net_bridge_eht_addr *h_addr,
@@ -701,8 +725,13 @@ static bool br_multicast_eht_inc(struct net_bridge_port_group *pg,
 				 size_t addr_size,
 				 bool to_report)
 {
-	return __eht_inc_exc(pg, h_addr, srcs, nsrcs, addr_size, MCAST_INCLUDE,
-			     to_report);
+	bool changed;
+
+	changed = __eht_inc_exc(pg, h_addr, srcs, nsrcs, addr_size,
+				MCAST_INCLUDE, to_report);
+	br_eht_convert_host_filter_mode(pg, h_addr, MCAST_INCLUDE);
+
+	return changed;
 }
 
 static bool br_multicast_eht_exc(struct net_bridge_port_group *pg,
@@ -712,8 +741,13 @@ static bool br_multicast_eht_exc(struct net_bridge_port_group *pg,
 				 size_t addr_size,
 				 bool to_report)
 {
-	return __eht_inc_exc(pg, h_addr, srcs, nsrcs, addr_size, MCAST_EXCLUDE,
-			     to_report);
+	bool changed;
+
+	changed = __eht_inc_exc(pg, h_addr, srcs, nsrcs, addr_size,
+				MCAST_EXCLUDE, to_report);
+	br_eht_convert_host_filter_mode(pg, h_addr, MCAST_EXCLUDE);
+
+	return changed;
 }
 
 static bool __eht_ip4_handle(struct net_bridge_port_group *pg,