[PATCH net] 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>
---
 net/bridge/br_input.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 232133a0fd21..7fa2da6985b5 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c

@@ -155,6 +155,8 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
 			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;
 		}
 	}
 

-- 
2.47.1