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When userspace doesn't provide a mask, OVS datapath generates a fully unwildcarded mask for the flow by copying the flow and setting all bits in all fields. For IPv6 label, this creates a mask that matches on the upper 12 bits, causing the following error: openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff, max=fffff) This patch ignores the label validation check for masks, avoiding this error. Signed-off-by: Joe Stringer <[email protected]> Acked-by: Pravin B Shelar <[email protected]> Signed-off-by: David S. Miller <[email protected]>