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Add a new netlink method to migrate a single xfrm_state. Unlike the existing migration mechanism (SA + policy), this supports migrating only the SA and allows changing the reqid. The SA is looked up via xfrm_usersa_id, which uniquely identifies it, so old_saddr is not needed. old_daddr is carried in xfrm_usersa_id.daddr. The reqid is invariant in the old migration. Signed-off-by: Antony Antony <antony.antony@secunet.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>