resolve compile error

src/upf-n4/pkg/upf/controller/server.go

@@ -137,6 +137,12 @@ func handleHeartBeatMsg(msgContent message.Message) []byte {
 
 func handleSessionEstablishmentMsg(config *conf.Config, msgContent message.Message) []byte {
 	msg, ok := msgContent.(*message.SessionEstablishmentRequest)
+	defer func() {
+		err := recover()
+		if err != nil {
+			log.Error("Panicing %s\n", err)
+		}
+	}()
 
 	if !ok {
 		log.Warn("got unexpected message: " + msg.MessageTypeName())
@@ -160,9 +166,9 @@ func handleSessionEstablishmentMsg(config *conf.Config, msgContent message.Messa
 	sourceInterface, _ := pdiIEs[0].SourceInterface()
 	//fteid, _ := pdiIEs[1].FTEID()
 	ueipaddress, _ := pdiIEs[2].UEIPAddress()
+	farid, _ := createPDR[3].FARID()
 
 	createFAR, _ := msg.CreateFAR[0].CreateFAR()
-	farid, _ := createFAR[0].FARID()
 	applyAction, _ := createFAR[1].ApplyAction()
 	forwardingParameters, _ := createFAR[2].ForwardingParameters()
 	destinationInterface, _ := forwardingParameters[0].DestinationInterface()
@@ -193,6 +199,7 @@ func handleSessionEstablishmentMsg(config *conf.Config, msgContent message.Messa
 					Flags: 1,
 					Teid:  ueUpTeid[ueipaddress.IPv4Address.String()],
 					IP:    upf.BuptNodeValueIP4(ip4ToUint(config.Gnb)),
+					//IP:    upf.BuptNodeValueIP4([4]uint8{192, 168, 2, 137}),
 				},
 				UeAddr: upf.BuptPfcpUeIPAddress{
 					Flags: 2,
@@ -244,6 +251,12 @@ func handleSessionEstablishmentMsg(config *conf.Config, msgContent message.Messa
 
 func handleSessionModificationMsg(config *conf.Config, msgContent message.Message) []byte {
 	msg, ok := msgContent.(*message.SessionModificationRequest)
+	defer func() {
+		err := recover()
+		if err != nil {
+			log.Error("Panicing %s\n", err)
+		}
+	}()
 
 	if !ok {
 		log.Warn("got unexpected message: " + msg.MessageTypeName())
@@ -258,7 +271,6 @@ func handleSessionModificationMsg(config *conf.Config, msgContent message.Messag
 		pdrid, _ := createPDR[0].PacketDetectionRuleID()
 		pdiIEs, _ := createPDR[2].PDI()
 		ueipaddress, _ := pdiIEs[1].UEIPAddress()
-
 		modReqIP = ueipaddress.IPv4Address.String()
 
 		//  set ueip into seid
@@ -274,7 +286,6 @@ func handleSessionModificationMsg(config *conf.Config, msgContent message.Messag
 		log.Info("SEID:%d", msg.SEID())
 		log.Info("TEID 0x%x", outerHeaderCreation.TEID)
 		log.Info("UE IP: %s", ueSeid[msg.SEID()])
-		log.Info("PDR ID: %d", pdrid)
 		log.Info("FAR ID:%d", farid)
 		log.Info("UE IPv4:%s", ueIP)
 		log.Info("GNB GTPU IP:%s", gnbIP)
@@ -287,7 +298,7 @@ func handleSessionModificationMsg(config *conf.Config, msgContent message.Messag
 			Teid:   outerHeaderCreation.TEID,
 			PdrID:  uint32(pdrid),
 			Ueip:   IPToUInt32(net.ParseIP(modReqIP)),
-			FarID:  uint16(1),
+			FarID:  uint16(farid),
 			GnbIP:  IPToUInt32(net.ParseIP(gnbIP)),
 			Port:   uint16(2152),
 		}
@@ -317,6 +328,7 @@ func handleSessionModificationMsg(config *conf.Config, msgContent message.Messag
 		log.Info("pdrid: %d", farid)
 		log.Info("ueip %s:index %d", ueip, updateUeIndex[ueip])
 		log.Info("TEID 0x%x", outerHeaderCreation.TEID)
+		log.Info("GNB GTPu: %s", outerHeaderCreation.IPv4Address.String())
 
 		req := &upf.UpfSsmReq{
 			CpSeid: msg.SEID(),
@@ -332,7 +344,7 @@ func handleSessionModificationMsg(config *conf.Config, msgContent message.Messag
 					FTeid: upf.BuptPfcpFTeid{
 						Flags: 1,
 						Teid:  outerHeaderCreation.TEID,
-						IP:    upf.BuptNodeValueIP4(ip4ToUint(config.Gnb)),
+						IP:    upf.BuptNodeValueIP4(ip4ToUint(outerHeaderCreation.IPv4Address.String())),
 					},
 					UeAddr: upf.BuptPfcpUeIPAddress{
 						Flags: 2,