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/* Translation Port sitting on top of IPL4_asp UDP to encode/decode GTP */
/* (C) 2017 by Harald Welte <laforge@gnumonks.org */
module GTP_CodecPort {
	import from IPL4asp_PortType all;
	import from IPL4asp_Types all;
	import from GTPC_Types all;
	import from GTPU_Types all;

	/* identifies a remote peer (sender or receiver) */
	type record GtpPeer {
		ConnectionId	connId,
		HostName	remName,
		PortNumber	remPort
	}

	/* Decoded GTP1C (Control Plane), used in send and receive direction */
	type record Gtp1cUnitdata {
		GtpPeer		peer,
		PDU_GTPC	gtpc
	}

	/* Decoded GTP1U (User Plane), used in send and receive direction */
	type record Gtp1uUnitdata {
		GtpPeer		peer,
		PDU_GTPU	gtpu
	}

 	/* Translation port on top of IPL4asp; ASP_Event passed through transparently */
	type port GTPC_PT message map to IPL4asp_PT {
		out	Gtp1cUnitdata to ASP_SendTo with f_enc_Gtp1cUD();
		in	Gtp1cUnitdata from ASP_RecvFrom with f_dec_Gtp1cUD(),
			ASP_Event;
		/* we can declare variables here and use them from all functions with "port" label */
	}

	function f_enc_Gtp1cUD(in Gtp1cUnitdata in_ud, out ASP_SendTo out_ud) port GTPC_PT {
		out_ud.connId := in_ud.peer.connId;
		out_ud.remName := in_ud.peer.remName;
		out_ud.remPort := in_ud.peer.remPort;
		out_ud.proto := { udp := {} };
		out_ud.msg := enc_PDU_GTPC(in_ud.gtpc);
		port.setstate(0);
	} with { extension "prototype(fast)" };

	function f_dec_Gtp1cUD(in ASP_RecvFrom in_ud, out Gtp1cUnitdata out_ud) port GTPC_PT {
		out_ud.peer.connId := in_ud.connId;
		out_ud.peer.remName := in_ud.remName;
		out_ud.peer.remPort := in_ud.remPort;
		out_ud.gtpc := dec_PDU_GTPC(in_ud.msg);
		port.setstate(0);
	} with { extension "prototype(fast)" };


	/* Translation port on top of IPL4asp; ASP_Event passed through transparently */
	type port GTPU_PT message map to IPL4asp_PT {
		out	Gtp1uUnitdata to ASP_SendTo with f_enc_Gtp1uUD();
		in	Gtp1uUnitdata from ASP_RecvFrom with f_dec_Gtp1uUD(),
			ASP_Event;
		/* we can declare variables here and use them from all functions with "port" label */
	}

	function f_enc_Gtp1uUD(in Gtp1uUnitdata in_ud, out ASP_SendTo out_ud) port GTPU_PT {
		out_ud.connId := in_ud.peer.connId;
		out_ud.remName := in_ud.peer.remName;
		out_ud.remPort := in_ud.peer.remPort;
		out_ud.proto := { udp := {} };
		out_ud.msg := enc_PDU_GTPU(in_ud.gtpu);
		port.setstate(0);
	} with { extension "prototype(fast)" };

	function f_dec_Gtp1uUD(in ASP_RecvFrom in_ud, out Gtp1uUnitdata out_ud) port GTPU_PT {
		out_ud.peer.connId := in_ud.connId;
		out_ud.peer.remName := in_ud.remName;
		out_ud.peer.remPort := in_ud.remPort;
		out_ud.gtpu := dec_PDU_GTPU(in_ud.msg);
		port.setstate(0);
	} with { extension "prototype(fast)" };
/*
	function f_GTPC_listen(inout GTPC_PT portRef, in HostName locName,
				in PortNumber locPort) return Result { 
		return f_IPL4_listen(portRef, locName, locPort, { udp := {} });
	}
*/
}