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net: bridge: BROPT_FDB_LOCAL_VLAN_0: Look up FDB on VLAN 0 on miss

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When BROPT_FDB_LOCAL_VLAN_0 is enabled, the local FDB entries for the
member ports as well as the bridge itself should not be created per-VLAN,
but instead only on VLAN 0.

That means that br_handle_frame_finish() needs to make two lookups: the
primary lookup on an appropriate VLAN, and when that misses, a lookup on
VLAN 0.

Have the second lookup only accept local MAC addresses. Turning this into a
generic second-lookup feature is not the goal.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/8087475009dce360fb68d873b1ed9c80827da302.1757004393.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata
2025-09-04 19:07:19 +02:00
committed by Jakub Kicinski
parent c1164178e9
commit 60d6be0931
1 changed files with 8 additions and 0 deletions
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8
net/bridge/br_input.c
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@@ -202,6 +202,14 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
break;
case BR_PKT_UNICAST:
dst = br_fdb_find_rcu(br, eth_hdr(skb)->h_dest, vid);
if (unlikely(!dst && vid &&
br_opt_get(br, BROPT_FDB_LOCAL_VLAN_0))) {
dst = br_fdb_find_rcu(br, eth_hdr(skb)->h_dest, 0);
if (dst &&
(!test_bit(BR_FDB_LOCAL, &dst->flags) ||
test_bit(BR_FDB_ADDED_BY_USER, &dst->flags)))
dst = NULL;
}
break;
default:
break;