library/S1AP_CodecPort.ttcn

module S1AP_CodecPort {

/* Simple S1AP Codec Port, translating between raw SCTP primitives with
 * octetstring payload towards the IPL4asp provider, and S1AP primitives
 * which carry the decoded S1AP data types as payload.
 *
 * (C) 2019 by Harald Welte <laforge@gnumonks.org>
 * All rights reserved.
 *
 * Released under the terms of GNU General Public License, Version 2 or
 * (at your option) any later version.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

	import from IPL4asp_PortType all;
	import from IPL4asp_Types all;
	import from S1AP_PDU_Descriptions all;
	import from S1AP_Types all;

	type record S1AP_RecvFrom {
		ConnectionId	connId,
		HostName	remName,
		PortNumber	remPort,
		HostName	locName,
		PortNumber	locPort,
		S1AP_PDU	msg
	};

	template S1AP_RecvFrom t_S1AP_RecvFrom(template S1AP_PDU msg) := {
		connId := ?,
		remName := ?,
		remPort := ?,
		locName := ?,
		locPort := ?,
		msg := msg
	}

	type record S1AP_Send {
		ConnectionId	connId,
		S1AP_PDU	msg
	}

	template S1AP_Send t_S1AP_Send(template ConnectionId connId, template S1AP_PDU msg) := {
		connId := connId,
		msg := msg
	}

	private function IPL4_to_S1AP_RecvFrom(in ASP_RecvFrom pin, out S1AP_RecvFrom pout) {
		pout.connId := pin.connId;
		pout.remName := pin.remName;
		pout.remPort := pin.remPort;
		pout.locName := pin.locName;
		pout.locPort := pin.locPort;
		pout.msg := dec_S1AP_PDU(pin.msg);
	} with { extension "prototype(fast)" };

	private function S1AP_to_IPL4_Send(in S1AP_Send pin, out ASP_Send pout) {
		pout.connId := pin.connId;
		pout.proto := {
			sctp := {
				sinfo_stream := omit,
				sinfo_ppid := 18,
				remSocks := omit,
				assocId := omit
			}
		};
		pout.msg := enc_S1AP_PDU(pin.msg);
	} with { extension "prototype(fast)" };

	type port S1AP_CODEC_PT message {
		out	S1AP_Send;
		in	S1AP_RecvFrom,
			ASP_ConnId_ReadyToRelease,
			ASP_Event;
	} with { extension "user IPL4asp_PT
		out(S1AP_Send -> ASP_Send:function(S1AP_to_IPL4_Send))
		in(ASP_RecvFrom -> S1AP_RecvFrom: function(IPL4_to_S1AP_RecvFrom);
		   ASP_ConnId_ReadyToRelease -> ASP_ConnId_ReadyToRelease: simple;
		   ASP_Event -> ASP_Event: simple)"
	}
}