code: func (h *Handle) XfrmPolicyGet(policy *XfrmPolicy) (*XfrmPolicy, error) {
  	return h.xfrmPolicyGetOrDelete(policy, nl.XFRM_MSG_GETPOLICY)
  }
docs: // XfrmPolicyGet gets a the policy described by the index or selector, if found.
  // Equivalent to: `ip xfrm policy get { SELECTOR | index INDEX } dir DIR [ctx CTX ] [ mark MARK [ mask MASK ] ] [ ptype PTYPE ]`.