[PATCH net-next v4 09/14] net: bridge: mcast: track active state, VLAN snooping

["Linus Lüssing" <linus.luessing@c0d3.blue>]

If VLAN aware multicast snooping is enabled then we need to perform a
few extra checks to figure out if multicast snooping is actually enabled
for a specific VLAN, as there is then an additional per VLAN multicast
snooping toggle.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
 net/bridge/br_multicast.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index cdc921b97243..1059984d8147 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1142,9 +1142,31 @@ static void br_multicast_update_active(struct net_bridge_mcast *brmctx)
 
 	lockdep_assert_held_once(&brmctx->br->multicast_lock);
 
-	if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED))
+	if (!br_opt_get(brmctx->br, BROPT_MULTICAST_ENABLED)) {
 		force_inactive = true;
+		goto update;
+	}
 
+	if (br_opt_get(brmctx->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
+		/* with per-vlan snooping enabled there is an extra per-vlan
+		 * toggle to enable/disable snooping which we must check
+		 */
+		if (br_multicast_ctx_vlan_global_disabled(brmctx))
+			force_inactive = true;
+		/* with per-vlan snooping enabled the non-vlan multicast
+		 * snooping context is inactive
+		 */
+		else if (!br_multicast_ctx_is_vlan(brmctx))
+			force_inactive = true;
+	} else {
+		/* with per-vlan snooping disabled a vlan multicast
+		 * snooping context is inactive
+		 */
+		if (br_multicast_ctx_is_vlan(brmctx))
+			force_inactive = true;
+	}
+
+update:
 	br_ip4_multicast_update_active(brmctx, force_inactive);
 	br_ip6_multicast_update_active(brmctx, force_inactive);
 
@@ -4505,6 +4527,7 @@ void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
 
 		spin_lock_bh(&br->multicast_lock);
 		vlan->priv_flags ^= BR_VLFLAG_MCAST_ENABLED;
+		br_multicast_update_active(&vlan->br_mcast_ctx);
 
 		if (on)
 			__br_multicast_open(&vlan->br_mcast_ctx);
-- 
2.53.0