kernel: receive all bridged multicast packets if IFF_ALLMULTI is set

Fixes issues with odhcpd, especially in relay mode

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/generic/pending-6.6/642-net-bridge-locally-receive-all-multicast-packets-if-.patch

@@ -0,0 +1,24 @@
+From: Felix Fietkau <[email protected]>
+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 <[email protected]>
+---
+
+--- 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;
+ 		}
+ 	}
+ 

target/linux/generic/pending-6.6/710-bridge-add-knob-for-filtering-rx-tx-BPDU-pack.patch

@@ -45,7 +45,7 @@ Signed-off-by: Felix Fietkau <[email protected]>
  			if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
 --- a/net/bridge/br_input.c
 +++ b/net/bridge/br_input.c
-@@ -367,6 +367,8 @@ static rx_handler_result_t br_handle_fra
+@@ -369,6 +369,8 @@ static rx_handler_result_t br_handle_fra
  		fwd_mask |= p->group_fwd_mask;
  		switch (dest[5]) {
  		case 0x00:	/* Bridge Group Address */