net: bridge: resolve forwarding path for VLAN tag actions in bridge devices
Depending on the VLAN settings of the bridge and the port, the bridge can
either add or remove a tag. When vlan filtering is enabled, the fdb lookup
also needs to know the VLAN tag/proto for the destination address
To provide this, keep track of the stack of VLAN tags for the path in the
lookup context
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 1b1955a..4db3f06 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -786,6 +786,12 @@ static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
path->encap.proto = vlan->vlan_proto;
path->dev = ctx->dev;
ctx->dev = vlan->real_dev;
+ if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
+ return -ENOSPC;
+
+ ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
+ ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
+ ctx->num_vlans++;
return 0;
}