#define ike_hdr_is_response(_h) ((_h)->flags & IKEV2_HDR_FLAG_RESPONSE)
#define ike_hdr_is_request(_h) (!ike_hdr_is_response(_h))
#define ike_hdr_is_initiator(_h) ((_h)->flags & IKEV2_HDR_FLAG_INITIATOR)
#define ike_hdr_is_responder(_h) (!(ike_hdr_is_initiator(_h)))
#define ike_hdr_is_response(_h) ((_h)->flags & IKEV2_HDR_FLAG_RESPONSE)
#define ike_hdr_is_request(_h) (!ike_hdr_is_response(_h))
#define ike_hdr_is_initiator(_h) ((_h)->flags & IKEV2_HDR_FLAG_INITIATOR)
#define ike_hdr_is_responder(_h) (!(ike_hdr_is_initiator(_h)))