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Add UDP encapsulation port to XFRM_MSG_MIGRATE using an optional netlink attribute XFRMA_ENCAP. The devices that support IKE MOBIKE extension (RFC-4555 Section 3.8) could go to sleep for a few minutes and wake up. When it wake up the NAT mapping could have expired, the device send a MOBIKE UPDATE_SA message to migrate the IPsec SA. The change could be a change UDP encapsulation port, IP address, or both. Reported-by: Paul Wouters <pwouters@redhat.com> Signed-off-by: Antony Antony <antony@phenome.org> Reviewed-by: Richard Guy Briggs <rgb@tricolour.ca> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>