msc_tests/MSC_Tests.ttcn

module MSC_Tests {

import from General_Types all;
import from Osmocom_Types all;

import from M3UA_Types all;
import from M3UA_Emulation all;

import from MTP3asp_Types all;
import from MTP3asp_PortType all;

import from SCCPasp_Types all;
import from SCCP_Types all;
import from SCCP_Emulation all;

import from SCTPasp_Types all;
import from SCTPasp_PortType all;

import from Osmocom_CTRL_Functions all;
import from Osmocom_CTRL_Types all;
import from Osmocom_CTRL_Adapter all;

import from MNCC_Emulation all;
import from MNCC_Types all;

import from GSUP_Emulation all;
import from GSUP_Types all;
import from IPA_Emulation all;

import from BSSAP_Types all;
import from BSSAP_Adapter all;
import from BSSAP_CodecPort all;
import from BSSMAP_Templates all;
import from BSSMAP_Emulation all;
import from BSC_ConnectionHandler all;

import from MobileL3_Types all;
import from MobileL3_CommonIE_Types all;
import from L3_Templates all;


type component MTC_CT extends BSSAP_Adapter_CT, CTRL_Adapter_CT {
	var boolean g_initialized := false;

	/* no 'adapter_CT' for MNCC or GSUP */
	var MNCC_Emulation_CT vc_MNCC;
	var GSUP_Emulation_CT vc_GSUP;
	var IPA_Emulation_CT vc_GSUP_IPA;

	/* only to get events from IPA underneath GSUP */
	port IPA_CTRL_PT GSUP_IPA_EVENT;
}

modulepar {
	/* remote parameters of IUT */
	charstring mp_msc_ip := "127.0.0.1";
	integer mp_msc_ctrl_port := 4255;
	integer mp_msc_vty_port := 4254;

	/* local parameters of emulated HLR */
	charstring mp_hlr_ip := "127.0.0.1";
	integer mp_hlr_port := 4222;

	charstring mp_msc_mncc := "/tmp/mncc";
}


function f_init_mncc(charstring id) runs on MTC_CT {
	id := id & "-MNCC";
	var MnccOps ops := {
		create_cb := refers(MNCC_Emulation.ExpectedCreateCallback),
		unitdata_cb := refers(MNCC_Emulation.DummyUnitdataCallback)
	}

	vc_MNCC := MNCC_Emulation_CT.create(id);
	map(vc_MNCC:MNCC, system:MNCC_CODEC_PT);
	vc_MNCC.start(MNCC_Emulation.main(ops, id, mp_msc_mncc));
}

function f_init_gsup(charstring id) runs on MTC_CT {
	id := id & "-GSUP";
	var GsupOps ops := {
		create_cb := refers(GSUP_Emulation.ExpectedCreateCallback)
	}

	vc_GSUP_IPA := IPA_Emulation_CT.create(id & "-IPA");
	vc_GSUP := GSUP_Emulation_CT.create(id);

	map(vc_GSUP_IPA:IPA_PORT, system:IPA_CODEC_PT);
	connect(vc_GSUP:GSUP, vc_GSUP_IPA:IPA_GSUP_PORT);
	/* we use this hack to get events like ASP_IPA_EVENT_UP */
	connect(vc_GSUP_IPA:IPA_CTRL_PORT, self:GSUP_IPA_EVENT);

	vc_GSUP.start(GSUP_Emulation.main(ops, id));
	vc_GSUP_IPA.start(IPA_Emulation.main_server(mp_hlr_ip, mp_hlr_port));

	/* wait for incoming connection to GSUP port before proceeding */
	timer T := 10.0;
	T.start;
	alt {
		[] GSUP_IPA_EVENT.receive(t_ASP_IPA_EVT_UD(ASP_IPA_EVENT_UP)) { }
		[] T.timeout {
			setverdict(inconc, "No connection to GSUP Port");
			self.stop
		}
	}
}

function f_init() runs on MTC_CT {

	if (g_initialized == true) {
		return;
	}
	g_initialized := true;

	f_bssap_init("MSC_Test", BSC_BssmapOps);
	f_ipa_ctrl_start(mp_msc_ip, mp_msc_ctrl_port);
	f_init_mncc("MSC_Test");
	f_init_gsup("MSC_Test");
}

template PDU_BSSAP ts_BSSAP_BSSMAP := {
	discriminator := '0'B,
	spare := '0000000'B,
	dlci := omit,
	lengthIndicator := 0,	/* overwritten by codec */
	pdu := ?
}

template PDU_BSSAP tr_BSSAP_BSSMAP := {
	discriminator := '0'B,
	spare := '0000000'B,
	dlci := omit,
	lengthIndicator := ?,
	pdu := {
		bssmap := ?
	}
}


type integer BssmapCause;

template (value) BSSMAP_IE_Cause ts_BSSMAP_IE_Cause(BssmapCause val) := {
	elementIdentifier := '04'O,
	lengthIndicator := 0,
	causeValue := int2bit(val, 7),
	extensionCauseValue := '0'B,
	spare1 := omit
}

template (value) PDU_BSSAP ts_BSSMAP_Reset(BssmapCause cause) modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			reset := {
				messageType := '30'O,
				cause := ts_BSSMAP_IE_Cause(cause),
				a_InterfaceSelectorForReset := omit
			}
		}
	}
}

template (value) PDU_BSSAP ts_BSSMAP_ResetAck modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			resetAck := {
				messageType := '31'O,
				a_InterfaceSelectorForReset := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_ResetAck modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			resetAck := {
				messageType := '31'O,
				a_InterfaceSelectorForReset := *
			}
		}
	}
}

template BSSMAP_IE_CellIdentifier ts_BSSMAP_IE_CellID := {
	elementIdentifier := '05'O,
	lengthIndicator := 0,
	cellIdentifierDiscriminator := '0000'B,
	spare1_4 := '0000'B,
	cellIdentification := ?
}

type uint16_t BssmapLAC;
type uint16_t BssmapCI;

/*
template BSSMAP_IE_CellIdentifier ts_CellId_CGI(mcc, mnc, lac, ci)
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_LAC_CGI := {
			mnc_mcc := FIXME,
			lac := int2oct(lac, 2),
			ci := int2oct(ci, 2)
		}
	}
}
*/

template BSSMAP_IE_CellIdentifier ts_CellID_LAC_CI(BssmapLAC lac, BssmapCI ci)
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_LAC_CI := {
			lac := int2oct(lac, 2),
			ci := int2oct(ci, 2)
		}
	}
}

template BSSMAP_IE_CellIdentifier ts_CellId_CI(BssmapCI ci)
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_CI := int2oct(ci, 2)
	}
}

template BSSMAP_IE_CellIdentifier ts_CellId_none
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_noCell := ''O
	}
}


template BSSMAP_IE_Layer3Information ts_BSSMAP_IE_L3Info(octetstring l3info) := {
	elementIdentifier := '17'O,
	lengthIndicator := 0,
	layer3info := l3info
}

template PDU_BSSAP ts_BSSMAP_ComplL3(BSSMAP_IE_CellIdentifier cell_id, octetstring l3_info)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			completeLayer3Information := {
				messageType := '57'O,
				cellIdentifier := cell_id,
				layer3Information := ts_BSSMAP_IE_L3Info(l3_info),
				chosenChannel := omit,
				lSAIdentifier := omit,
				aPDU := omit,
				codecList := omit,
				redirectAttemptFlag := omit,
				sendSequenceNumber := omit,
				iMSI := omit
			}
		}
	}
}

template PDU_BSSAP ts_BSSMAP_HandoReq(BssmapCause cause, BSSMAP_IE_CellIdentifierList cid_list)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			handoverRequired := {
				messageType := '11'O,
				cause := ts_BSSMAP_IE_Cause(cause),
				responseRequest := omit,
				cellIdentifierList := cid_list,
				circuitPoolList := omit,
				currentChannelType1 := omit,
				speechVersion := omit,
				queueingIndicator := omit,
				oldToNewBSSInfo := omit,
				sourceToTargetRNCTransparentInfo := omit,
				sourceToTargetRNCTransparentInfoCDMA := omit,
				gERANClassmark := omit,
				talkerPriority := omit,
				speechCodec := omit,
				cSG_Identifier := omit
			}
		}
	}
}

//	enc_PDU_BSSAP

function f_send_BSSAP_UNITDATA(template PDU_BSSAP bssap) runs on MTC_CT {
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_sccp_addr_peer, g_sccp_addr_own, bssap))
}

type function void_fn(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr;

function f_gen_imsi(hexstring prefix, integer suffix) return hexstring {
	var integer suffix_len := 15 - lengthof(prefix);
	suffix_len := suffix_len-1; /* FIXME: fix odd IMSI length */
	return prefix & int2hex(suffix, suffix_len);
}

function f_gen_msisdn(hexstring prefix, integer suffix) return hexstring {
	var integer suffix_len := 12 - lengthof(prefix);
	return prefix & int2hex(suffix, suffix_len);
}

/* FIXME: move into BSC_ConnectionHandler? */
function f_start_handler(void_fn fn, charstring id, integer imsi_suffix) runs on MTC_CT return BSC_ConnHdlr {
	var BSC_ConnHdlr vc_conn;
	var BSC_ConnHdlrPars pars := {
		sccp_addr_own := g_sccp_addr_own,
		sccp_addr_peer := g_sccp_addr_peer,
		cell_id := valueof(ts_CellId_CGI('262'H, '042'H, 23, 42)),
		imsi := f_gen_imsi('26242'H, imsi_suffix),
		msisdn := f_gen_msisdn('491239999'H, imsi_suffix),
		cm2 := valueof(ts_CM2_default),
		cm3 := omit
	};

	vc_conn := BSC_ConnHdlr.create(id);
	/* BSSMAP part / A interface */
	connect(vc_conn:BSSAP, vc_BSSMAP:CLIENT);
	connect(vc_conn:BSSAP_PROC, vc_BSSMAP:PROC);
	/* MNCC part */
	connect(vc_conn:MNCC, vc_MNCC:MNCC_CLIENT);
	connect(vc_conn:MNCC_PROC, vc_MNCC:MNCC_PROC);
	/* GSUP part */
	connect(vc_conn:GSUP, vc_GSUP:GSUP_CLIENT);
	connect(vc_conn:GSUP_PROC, vc_GSUP:GSUP_PROC);

	vc_conn.start(derefers(fn)(id, pars));
	return vc_conn;
}

function f_sleep(float seconds) {
	timer T := seconds;
	T.start;
	T.timeout;
}

private function f_tc_lu_imsi_noauth_tmsi(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;
	f_perform_lu(false, true, true);
}
testcase TC_lu_imsi_noauth_tmsi() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_imsi_noauth_tmsi), testcasename(), 1);
	vc_conn.done;
}

private function f_tc_lu_imsi_noauth_notmsi(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;
	f_perform_lu(false, false, true);
}
testcase TC_lu_imsi_noauth_notmsi() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_imsi_noauth_notmsi), testcasename(), 2);
	vc_conn.done;
}

/* Do LU by IMSI, refuse it on GSUP and expect LU REJ back to MS */
private function f_tc_lu_imsi_reject(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;
	var PDU_ML3_MS_NW l3_lu := f_build_lu_imsi(g_pars.imsi);

	f_create_gsup_expect(hex2str(g_pars.imsi));
	f_bssap_compl_l3(l3_lu);
	GSUP.receive(tr_GSUP_UL_REQ(g_pars.imsi));
	GSUP.send(ts_GSUP_UL_ERR(g_pars.imsi, 23));
	alt {
		[] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Rej(int2oct(23,1)))) { }
		[] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Acc)) {
			setverdict(fail, "Expecting LU REJ, but got ACCEPT");
			self.stop;
		}
	}
	BSSAP.receive(tr_BSSMAP_ClearCommand);
	BSSAP.send(ts_BSSMAP_ClearComplete);
	BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);
	setverdict(pass);
}
testcase TC_lu_imsi_reject() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_imsi_reject), testcasename(), 3);
	vc_conn.done;
}

/* Do LU by IMSI, timeout on GSUP */
private function f_tc_lu_imsi_timeout_gsup(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;
	var PDU_ML3_MS_NW l3_lu := f_build_lu_imsi(g_pars.imsi);

	f_create_gsup_expect(hex2str(g_pars.imsi));
	f_bssap_compl_l3(l3_lu);
	GSUP.receive(tr_GSUP_UL_REQ(g_pars.imsi));
	/* Normally the HLR would need to respond here, but we decide to force a timeout here */
	alt {
		/* FIXME: Expect specific reject cause */
		[] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Rej)) { }
		[] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Acc)) {
			setverdict(fail, "Expecting LU REJ, but got ACCEPT");
			self.stop;
		}
	}
	BSSAP.receive(tr_BSSMAP_ClearCommand);
	BSSAP.send(ts_BSSMAP_ClearComplete);
	BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);
	setverdict(pass);
}
testcase TC_lu_imsi_timeout_gsup() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_imsi_timeout_gsup), testcasename(), 4);
	vc_conn.done;
}

private function f_tc_lu_imsi_auth_tmsi(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;
	f_perform_lu(true, true, true);
}
testcase TC_lu_imsi_auth_tmsi() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_imsi_auth_tmsi), testcasename(), 5);
	vc_conn.done;
}


/* Send CM SERVICE REQ for IMSI that has never performed LU before */
private function f_tc_cmserv_imsi_unknown(charstring id, BSC_ConnHdlrPars pars)
runs on BSC_ConnHdlr {

	var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(g_pars.imsi));
	var BSSMAP_IE_CellIdentifier cell_id := valueof(ts_CellId_CGI('262'H, '042'H, 23, 42));
	var PDU_ML3_MS_NW l3_info := valueof(ts_CM_SERV_REQ('0001'B, mi));

	f_create_gsup_expect(hex2str(g_pars.imsi));

	/* Send BSSAP_Conn_Req with COMPL L3 INFO to MSC */
	f_bssap_compl_l3(l3_info);

	timer T := 10.0;
	T.start;
	alt {
	[] BSSAP.receive(tr_PDU_DTAP_MT(tr_CM_SERV_REJ)) { }
	//[] BSSAP.receive(tr_PDU_DTAP_MT(tr_CM_SERV_ACC)) { }
	[] BSSAP.receive { setverdict(fail, "Received unexpected BSSAP"); }
	[] GSUP.receive(tr_GSUP_UL_REQ(g_pars.imsi)) {
		setverdict(fail, "Unexpected GSUP UL REQ");
		}
	[] T.timeout { setverdict(inconc, "Timeout waiting for CM SERV REQ"); }
	}

	alt {
	[] BSSAP.receive(tr_BSSMAP_ClearCommand) {
		setverdict(pass);
		}
	[] BSSAP.receive { setverdict(fail, "Received unexpected BSSAP"); }
	[] T.timeout { setverdict(inconc, "Timeout waiting for CM SERV REQ"); }
	}
}
testcase TC_cmserv_imsi_unknown() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();
	vc_conn := f_start_handler(refers(f_tc_cmserv_imsi_unknown), testcasename(), 5);
	vc_conn.done;
}

private function f_tc_lu_and_mo_call(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;
	f_perform_lu(false, true, true);

	f_establish_fully(valueof(ts_MI_IMSI_LV(g_pars.imsi)), false);

	var hexstring called := '12345'H;
	var integer tid := 0;
	var MNCC_PDU mncc;
	f_create_mncc_expect(hex2str(called));

	BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MO_CC_SETUP(tid, called)));
	MNCC.receive(tr_MNCC_SETUP_ind(?, tr_MNCC_number(hex2str(called)))) -> value mncc;
	/* FIXME: extract call_id */

	/* Call Proceeding */
	MNCC.send(ts_MNCC_CALL_PROC_req(mncc.u.signal.callref, ts_MNCC_bcap_voice));
	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_CALL_PROC(tid)));

	/* Alerting */
	MNCC.send(ts_MNCC_ALERT_req(mncc.u.signal.callref));
	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_ALERTING(tid)));

	/* Answer. This causes TCH assignment in case of "late assignment" */
	MNCC.send(ts_MNCC_SETUP_COMPL_req(mncc.u.signal.callref));

	f_sleep(3.0);

	/* Hangup by "B" side */
	MNCC.send(ts_MNCC_DISC_req(mncc.u.signal.callref, valueof(ts_MNCC_cause(23))));
	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_DISC(tid)));

	/* Release of call */
	MNCC.send(ts_MNCC_REL_req(mncc.u.signal.callref, valueof(ts_MNCC_cause(42))));
	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_RELEASE(tid)));

	/* clearing of radio channel */
	BSSAP.receive(tr_BSSMAP_ClearCommand);
	BSSAP.send(ts_BSSMAP_ClearComplete);
	BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);

	f_sleep(5.0);
}
testcase TC_lu_and_mo_call() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_and_mo_call), testcasename(), 6);
	vc_conn.done;
}

/* Test LU (with authentication enabled), where HLR times out sending SAI response */
private function f_tc_lu_auth_sai_timeout(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;

	var PDU_ML3_MS_NW l3_lu := f_build_lu_imsi(g_pars.imsi)
	var PDU_DTAP_MT dtap_mt;

	/* tell GSUP dispatcher to send this IMSI to us */
	f_create_gsup_expect(hex2str(g_pars.imsi));

	/* Send BSSAP_Conn_Req with COMPL L3 INFO to MSC */
	f_bssap_compl_l3(l3_lu);

	/* Send Early Classmark, just for the fun of it */
	BSSAP.send(ts_BSSMAP_ClassmarkUpd(g_pars.cm2, g_pars.cm3));

	GSUP.receive(tr_GSUP_SAI_REQ(g_pars.imsi));
	/* The HLR would normally return an auth vector here, but we fail to do so. */

	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Rej));
	BSSAP.receive(tr_BSSMAP_ClearCommand);
	BSSAP.send(ts_BSSMAP_ClearComplete);
	BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);
	setverdict(pass);
}
testcase TC_lu_auth_sai_timeout() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_auth_sai_timeout), testcasename(), 7);
	vc_conn.done;
}

/* Test LU (with authentication enabled), where HLR rejects sending SAI error */
private function f_tc_lu_auth_sai_err(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
	g_pars := pars;

	var PDU_ML3_MS_NW l3_lu := f_build_lu_imsi(g_pars.imsi)
	var PDU_DTAP_MT dtap_mt;

	/* tell GSUP dispatcher to send this IMSI to us */
	f_create_gsup_expect(hex2str(g_pars.imsi));

	/* Send BSSAP_Conn_Req with COMPL L3 INFO to MSC */
	f_bssap_compl_l3(l3_lu);

	/* Send Early Classmark, just for the fun of it */
	BSSAP.send(ts_BSSMAP_ClassmarkUpd(g_pars.cm2, g_pars.cm3));

	GSUP.receive(tr_GSUP_SAI_REQ(g_pars.imsi));
	GSUP.send(ts_GSUP_SAI_ERR(g_pars.imsi, 13));

	BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Rej));
	BSSAP.receive(tr_BSSMAP_ClearCommand);
	BSSAP.send(ts_BSSMAP_ClearComplete);
	BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND);
	setverdict(pass);
}
testcase TC_lu_auth_sai_err() runs on MTC_CT {
	var BSC_ConnHdlr vc_conn;
	f_init();

	vc_conn := f_start_handler(refers(f_tc_lu_auth_sai_err), testcasename(), 8);
	vc_conn.done;
}



control {
	execute( TC_cmserv_imsi_unknown() );
	execute( TC_lu_imsi_noauth_tmsi() );
	//execute( TC_lu_imsi_noauth_notmsi() );
	execute( TC_lu_imsi_reject() );
	execute( TC_lu_imsi_timeout_gsup() );
	execute( TC_lu_and_mo_call() );
	execute( TC_lu_auth_sai_timeout() );
	execute( TC_lu_auth_sai_err() );
}


}