From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 17 Feb 2025 12:21:08 +0100
Subject: [PATCH] net: bridge: locally receive all multicast packets if
 IFF_ALLMULTI is set

If multicast snooping is enabled, multicast packets may not always end up on
the local bridge interface, if the host is not a member of the multicast
group. Similar to how IFF_PROMISC allows all packets to be received locally,
let IFF_ALLMULTI allow all multicast packets to be received.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -152,6 +152,8 @@ int br_handle_frame_finish(struct net *n
 			pkt_type = BR_PKT_MULTICAST;
 			if (br_multicast_rcv(&brmctx, &pmctx, vlan, skb, vid))
 				goto drop;
+			if (br->dev->flags & IFF_ALLMULTI)
+				local_rcv = true;
 		}
 	}