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kernel: receive all bridged multicast packets if IFF_ALLMULTI is set

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Fixes issues with odhcpd, especially in relay mode

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2025-02-17 12:29:27 +01:00
parent 51d485ef31
commit 38c21271d2
2 changed files with 25 additions and 1 deletions
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24
target/linux/generic/pending-6.6/642-net-bridge-locally-receive-all-multicast-packets-if-.patch Normal file
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@ -0,0 +1,24 @@
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;
}
}

2
target/linux/generic/pending-6.6/710-bridge-add-knob-for-filtering-rx-tx-BPDU-pack.patch
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@ -45,7 +45,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev) if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
--- a/net/bridge/br_input.c --- a/net/bridge/br_input.c
+++ b/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; fwd_mask |= p->group_fwd_mask;
switch (dest[5]) { switch (dest[5]) {
case 0x00: /* Bridge Group Address */ case 0x00: /* Bridge Group Address */