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This patch changes the lwtunnel_headroom() function which is called in ipv4_mtu() and ip6_mtu(), to also return the correct headroom value when the lwtunnel state is OUTPUT_REDIRECT. This patch enables e.g. SR-IPv6 encapsulations to work without manually setting the route mtu. Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>