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s1gw: make f_ConnHdlr_rx_session_modify_req() more flexible

Allow the caller to pass FAR ID, SEID, and E-RAB parameters (F-TEID),
so that it can also be used for testing the E-RAB MODIFY procedure.

Change-Id: I52317e79ac02cb4e321b49c2cd824de28e25a1c6
---
M s1gw/S1GW_ConnHdlr.ttcn
1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/s1gw/S1GW_ConnHdlr.ttcn b/s1gw/S1GW_ConnHdlr.ttcn
index 453eff5..4634064 100644
--- a/s1gw/S1GW_ConnHdlr.ttcn
+++ b/s1gw/S1GW_ConnHdlr.ttcn
@@ -664,25 +664,27 @@
 	PFCP.send(resp);
 }
 
-function f_ConnHdlr_rx_session_modify_req(in ERab erab)
+function f_ConnHdlr_rx_session_modify_req(in ERabParams epars,
+					  template (present) OCT8 seid := ?,
+					  template (present) LIN4_BO_LAST far_id := ?)
 runs on ConnHdlr return PDU_PFCP {
 	/* Forwarding Action Rules */
-	var template (present) Outer_Header_Creation ohc1;
-	var template (present) Update_Forwarding_Parameters fpars1;
-	var template (present) Update_FAR far1;
+	var template (present) Outer_Header_Creation ohc;
+	var template (present) Update_Forwarding_Parameters fpars;
+	var template (present) Update_FAR far;
 
-	ohc1 := tr_PFCP_Outer_Header_Creation_GTP_ipv4(erab.u2a.teid,
-						       f_inet_addr(erab.u2a.tla));
-	fpars1 := tr_PFCP_Update_Forwarding_Parameters(ohc := ohc1);
+	ohc := tr_PFCP_Outer_Header_Creation_GTP_ipv4(epars.teid,
+						      f_inet_addr(epars.tla));
+	fpars := tr_PFCP_Update_Forwarding_Parameters(ohc := ohc);
 
-	far1 := tr_PFCP_Update_FAR(far_id := 1, /* -- for Core -> Access */
-				   aa := tr_PFCP_Apply_Action_FORW,
-				   fp := fpars1);
+	far := tr_PFCP_Update_FAR(far_id := far_id,
+				  aa := tr_PFCP_Apply_Action_FORW,
+				  fp := fpars);
 
 	/* The final Session Modification Request PDU */
 	var template (present) PDU_PFCP tr_pdu;
-	tr_pdu := tr_PFCP_Session_Mod_Req(seid := erab.pfcp_loc_seid,
-					  update_far := far1);
+	tr_pdu := tr_PFCP_Session_Mod_Req(seid := seid,
+					  update_far := far);
 	return f_ConnHdlr_pfcp_expect(tr_pdu);
 }
 
@@ -732,7 +734,9 @@
 runs on ConnHdlr {
 	for (var integer i := 0; i < lengthof(erabs); i := i + 1) {
 		log("UPF <- S1GW: PFCP Session Modification Request for E-RAB ID ", erabs[i].erab_id);
-		var PDU_PFCP pdu := f_ConnHdlr_rx_session_modify_req(erabs[i]);
+		var PDU_PFCP pdu := f_ConnHdlr_rx_session_modify_req(epars := erabs[i].u2a,
+								     seid := erabs[i].pfcp_loc_seid,
+								     far_id := 1);
 		log("UPF -> S1GW: PFCP Session Modification Response for E-RAB ID ", erabs[i].erab_id);
 		f_ConnHdlr_tx_session_modify_resp(erabs[i], pdu);
 	}

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