/* GTPv2 Emulation in TTCN-3 * * (C) 2018-2020 Harald Welte * 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 */ module GTPv2_Emulation { import from IPL4asp_Types all; import from General_Types all; import from Osmocom_Types all; import from GTPv2_Types all; import from GTPv2_Templates all; import from GTPv2_CodecPort all; import from GTPv2_CodecPort_CtrlFunct all; /*********************************************************************** * Main Emulation Component ***********************************************************************/ //modulepar {}; const integer GTP2C_PORT := 2123; type record Gtp2EmulationCfg { HostName gtpc_bind_ip, IPL4asp_Types.PortNumber gtpc_bind_port, HostName gtpc_remote_ip, IPL4asp_Types.PortNumber gtpc_remote_port, boolean sgw_role }; type component GTPv2_Emulation_CT { /* Communication with underlying GTP CodecPort */ port GTPv2C_PT GTP2C; /* Communication with Clients */ port GTP2EM_PT TEIC0; port GTP2EM_PT CLIENT; port GTP2EM_PROC_PT CLIENT_PROC; /* Configuration by the user */ var Gtp2EmulationCfg g_gtp2_cfg; /* State */ var Gtp2cPeer g_peer; var integer g_gtp2c_id; var OCT1 g_restart_ctr; var uint16_t g_c_seq_nr; var TidTableRec TidTable[256]; var SeqTableRec SeqTable[256]; var ImsiTableRec ImsiTable[256]; var UdMsgTableRec UdMsgTable[256]; var PidTableRec PidTable[256]; }; /* local TEIC <-> ConnHdlr mapping */ type record TidTableRec { OCT4 teic, GTP2_ConnHdlr vc_conn }; /* local SeqNr <-> ConnHdlr mapping (until a response is received */ type record SeqTableRec { OCT3 seq, GTP2_ConnHdlr vc_conn }; /* IMSI <-> ConnHdlr mapping */ type record ImsiTableRec { hexstring imsi, GTP2_ConnHdlr vc_conn }; /* Unit data message type <-> ConnHdlr mapping */ type record UdMsgTableRec { OCT1 messageType, GTP2_ConnHdlr vc_conn }; /* pid <-> ConnHdlr mapping (for UECUPS process termination indication) */ type record PidTableRec { /* process ID of the running process */ integer pid, /* component that started it */ GTP2_ConnHdlr vc_conn }; private function f_teic_known(OCT4 teic) runs on GTPv2_Emulation_CT return boolean { var integer i; for (i := 0; i < sizeof(TidTable); i := i+1) { if (isbound(TidTable[i].teic) and TidTable[i].teic == teic) { return true; } } return false; } private function f_comp_by_teic(OCT4 teic) runs on GTPv2_Emulation_CT return GTP2_ConnHdlr { var integer i; for (i := 0; i < sizeof(TidTable); i := i+1) { if (isbound(TidTable[i].teic) and TidTable[i].teic == teic) { return TidTable[i].vc_conn; } } setverdict(fail, "No Component for TEIC ", teic); mtc.stop; } private function f_seq_known(OCT3 seq) runs on GTPv2_Emulation_CT return boolean { var integer i; for (i := 0; i < sizeof(SeqTable); i := i+1) { if (isbound(SeqTable[i].seq) and SeqTable[i].seq == seq) { return true; } } return false; } private function f_comp_by_seq(OCT3 seq) runs on GTPv2_Emulation_CT return GTP2_ConnHdlr { var integer i; for (i := 0; i < sizeof(SeqTable); i := i+1) { if (isbound(SeqTable[i].seq) and SeqTable[i].seq == seq) { return SeqTable[i].vc_conn; } } setverdict(fail, "No Component for SEQ ", seq); mtc.stop; } private function f_imsi_known(hexstring imsi) runs on GTPv2_Emulation_CT return boolean { var integer i; for (i := 0; i < sizeof(ImsiTable); i := i+1) { if (isbound(ImsiTable[i].imsi) and ImsiTable[i].imsi == imsi) { return true; } } return false; } private function f_comp_by_imsi(hexstring imsi) runs on GTPv2_Emulation_CT return GTP2_ConnHdlr { var integer i; for (i := 0; i < sizeof(ImsiTable); i := i+1) { if (isbound(ImsiTable[i].imsi) and ImsiTable[i].imsi == imsi) { return ImsiTable[i].vc_conn; } } setverdict(fail, "No Component for IMSI ", imsi); mtc.stop; } private function f_comp_by_pid(integer pid) runs on GTPv2_Emulation_CT return GTP2_ConnHdlr { var integer i; for (i := 0; i < sizeof(PidTable); i := i+1) { if (isbound(PidTable[i].pid) and PidTable[i].pid == pid) { /* fixme: remove */ return PidTable[i].vc_conn; } } setverdict(fail, "No Component for PID ", pid); mtc.stop; } private function f_tid_tbl_add(OCT4 teic, GTP2_ConnHdlr vc_conn) runs on GTPv2_Emulation_CT { var integer i; for (i := 0; i < sizeof(TidTable); i := i+1) { if (not isbound(TidTable[i].teic)) { TidTable[i].teic := teic; TidTable[i].vc_conn := vc_conn; return; } } testcase.stop("No Space in TidTable for ", teic); } private function f_seq_tbl_add(OCT3 seq, GTP2_ConnHdlr vc_conn) runs on GTPv2_Emulation_CT { var integer i; for (i := 0; i < sizeof(SeqTable); i := i+1) { if (not isbound(SeqTable[i].seq)) { SeqTable[i].seq := seq; SeqTable[i].vc_conn := vc_conn; return; } } testcase.stop("No Space in SeqTable for ", seq); } private function f_seq_tbl_del(OCT3 seq) runs on GTPv2_Emulation_CT { var integer i; for (i := 0; i < sizeof(SeqTable); i := i+1) { if (isbound(SeqTable[i].seq) and SeqTable[i].seq == seq) { SeqTable[i] := { seq := -, vc_conn := null } } } } private function f_imsi_tbl_add(hexstring imsi, GTP2_ConnHdlr vc_conn) runs on GTPv2_Emulation_CT { var integer i; for (i := 0; i < sizeof(ImsiTable); i := i+1) { if (not isbound(ImsiTable[i].imsi)) { ImsiTable[i].imsi := imsi; ImsiTable[i].vc_conn := vc_conn; return; } } testcase.stop("No Space in IMSI Table for ", imsi); } private function f_udmsg_tbl_add(OCT1 messageType, GTP2_ConnHdlr vc_conn) runs on GTPv2_Emulation_CT { var integer i; for (i := 0; i < sizeof(UdMsgTable); i := i+1) { if (not isbound(UdMsgTable[i].messageType)) { UdMsgTable[i].messageType := messageType; UdMsgTable[i].vc_conn := vc_conn; return; } } testcase.stop("No Space in UdMsg Table for messateType ", messageType); } private function f_pid_tbl_add(integer pid, GTP2_ConnHdlr vc_conn) runs on GTPv2_Emulation_CT { var integer i; for (i := 0; i < sizeof(PidTable); i := i+1) { if (not isbound(PidTable[i].pid)) { PidTable[i].pid := pid; PidTable[i].vc_conn := vc_conn; return; } } testcase.stop("No Space in PID Table for ", pid); } /* allocate an unused local teic */ private function f_alloc_teic() runs on GTPv2_Emulation_CT return OCT4 { var OCT4 teic; var integer i, j; for (i := 0; i < 100; i := i+1) { teic := f_rnd_octstring(4); for (j := 0; j < sizeof(TidTable); j := j+1) { if (isbound(TidTable) and TidTable[i].teic == teic) { continue; } } /* we iterated over all entries and found no match: great! */ return teic; } testcase.stop("Cannot find unused TEIC after ", i, " attempts"); } /* obtain the IMSI from a GTPv2C PDU, if there is any IMSI contained. The way how the TITAN * GTPv2 decoders are structured (explict IE members rather than a list/set of generic IE structures) * doesn't make this easy, but requires lots of boilerplate code. Oh well.. */ function f_gtp2c_extract_imsi(PDU_GTPCv2 gtp) return template (omit) hexstring { if (ischosen(gtp.gtpcv2_pdu.createSessionRequest)) { if (ispresent(gtp.gtpcv2_pdu.createSessionRequest.iMSI)) { return gtp.gtpcv2_pdu.createSessionRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.downlinkDataNotification)) { if (ispresent(gtp.gtpcv2_pdu.downlinkDataNotification.iMSI)) { return gtp.gtpcv2_pdu.downlinkDataNotification.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.downlinkDataNotificationAcknowledgement)) { if (ispresent(gtp.gtpcv2_pdu.downlinkDataNotificationAcknowledgement.iMSI)) { return gtp.gtpcv2_pdu.downlinkDataNotificationAcknowledgement.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.downlinkDataNotificationFailureIndication)) { if (ispresent(gtp.gtpcv2_pdu.downlinkDataNotificationFailureIndication.iMSI)) { return gtp.gtpcv2_pdu.downlinkDataNotificationFailureIndication.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.createIndirectDataForwardingTunnelRequest)) { if (ispresent(gtp.gtpcv2_pdu.createIndirectDataForwardingTunnelRequest.iMSI)) { return gtp.gtpcv2_pdu.createIndirectDataForwardingTunnelRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.stopPagingIndication)) { if (ispresent(gtp.gtpcv2_pdu.stopPagingIndication.iMSI)) { return gtp.gtpcv2_pdu.stopPagingIndication.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.forwardRelocationRequest)) { if (ispresent(gtp.gtpcv2_pdu.forwardRelocationRequest.iMSI)) { return gtp.gtpcv2_pdu.forwardRelocationRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.contextRequest)) { if (ispresent(gtp.gtpcv2_pdu.contextRequest.iMSI)) { return gtp.gtpcv2_pdu.contextRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.identificationResponse)) { if (ispresent(gtp.gtpcv2_pdu.identificationResponse.iMSI)) { return gtp.gtpcv2_pdu.identificationResponse.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.changeNotificationRequest)) { if (ispresent(gtp.gtpcv2_pdu.changeNotificationRequest)) { return gtp.gtpcv2_pdu.changeNotificationRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.changeNotificationResponse)) { if (ispresent(gtp.gtpcv2_pdu.changeNotificationResponse.iMSI)) { return gtp.gtpcv2_pdu.changeNotificationResponse.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.relocationCancelRequest)) { if (ispresent(gtp.gtpcv2_pdu.relocationCancelRequest.iMSI)) { return gtp.gtpcv2_pdu.relocationCancelRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.uE_RegistrationQueryRequest)) { if (ispresent(gtp.gtpcv2_pdu.uE_RegistrationQueryRequest.iMSI)) { return gtp.gtpcv2_pdu.uE_RegistrationQueryRequest.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.uE_RegistrationQueryResponse)) { if (ispresent(gtp.gtpcv2_pdu.uE_RegistrationQueryResponse.iMSI)) { return gtp.gtpcv2_pdu.uE_RegistrationQueryResponse.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.suspendNotification)) { if (ispresent(gtp.gtpcv2_pdu.suspendNotification.iMSI)) { return gtp.gtpcv2_pdu.suspendNotification.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.resumeNotification)) { if (ispresent(gtp.gtpcv2_pdu.resumeNotification.iMSI)) { return gtp.gtpcv2_pdu.resumeNotification.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.cSPagingIndication)) { if (ispresent(gtp.gtpcv2_pdu.cSPagingIndication.iMSI)) { return gtp.gtpcv2_pdu.cSPagingIndication.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.pGW_DownlinkTriggeringNotification)) { if (ispresent(gtp.gtpcv2_pdu.pGW_DownlinkTriggeringNotification.iMSI)) { return gtp.gtpcv2_pdu.pGW_DownlinkTriggeringNotification.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.pGW_DownlinkTriggeringAcknowledge)) { if (ispresent(gtp.gtpcv2_pdu.pGW_DownlinkTriggeringAcknowledge.iMSI)) { return gtp.gtpcv2_pdu.pGW_DownlinkTriggeringAcknowledge.iMSI.iMSI_Value; } } else if (ischosen(gtp.gtpcv2_pdu.traceSessionActivation)) { if (ispresent(gtp.gtpcv2_pdu.traceSessionActivation.iMSI)) { return gtp.gtpcv2_pdu.traceSessionActivation.iMSI.iMSI_Value; } } return omit; } private function f_gtp2c_is_initial_msg(PDU_GTPCv2 msg) return boolean { if (ischosen(msg.gtpcv2_pdu.echoRequest) or ischosen(msg.gtpcv2_pdu.versionNotSupported) or ischosen(msg.gtpcv2_pdu.createSessionRequest) or ischosen(msg.gtpcv2_pdu.createBearerRequest) or ischosen(msg.gtpcv2_pdu.bearerResourceCommand) or ischosen(msg.gtpcv2_pdu.bearerResourceFailureIndication) or ischosen(msg.gtpcv2_pdu.modifyBearerRequest) or ischosen(msg.gtpcv2_pdu.deleteSessionRequest) or ischosen(msg.gtpcv2_pdu.deleteBearerRequest) or ischosen(msg.gtpcv2_pdu.downlinkDataNotification) or ischosen(msg.gtpcv2_pdu.downlinkDataNotificationAcknowledgement) or ischosen(msg.gtpcv2_pdu.downlinkDataNotificationFailureIndication) or ischosen(msg.gtpcv2_pdu.deleteIndirectDataForwardingTunnelRequest) or ischosen(msg.gtpcv2_pdu.modifyBearerCommand) or ischosen(msg.gtpcv2_pdu.modifyBearerFailureIndication) or ischosen(msg.gtpcv2_pdu.updateBearerRequest) or ischosen(msg.gtpcv2_pdu.deleteBearerCommand) or ischosen(msg.gtpcv2_pdu.createIndirectDataForwardingTunnelRequest) or ischosen(msg.gtpcv2_pdu.releaseAccessBearersRequest) or ischosen(msg.gtpcv2_pdu.stopPagingIndication) or ischosen(msg.gtpcv2_pdu.modifyAccessBearersRequest) or ischosen(msg.gtpcv2_pdu.remoteUEReportNotification) or ischosen(msg.gtpcv2_pdu.remoteUEReportAcknowledge) or ischosen(msg.gtpcv2_pdu.forwardRelocationRequest) or ischosen(msg.gtpcv2_pdu.forwardRelocationCompleteNotification) or ischosen(msg.gtpcv2_pdu.forwardRelocationCompleteAcknowledge) or ischosen(msg.gtpcv2_pdu.contextRequest) or ischosen(msg.gtpcv2_pdu.contextAcknowledge) or ischosen(msg.gtpcv2_pdu.identificationRequest) or ischosen(msg.gtpcv2_pdu.forwardAccessContextNotification) or ischosen(msg.gtpcv2_pdu.forwardAccessContextAcknowledge) or ischosen(msg.gtpcv2_pdu.detachNotification) or ischosen(msg.gtpcv2_pdu.detachAcknowledge) or ischosen(msg.gtpcv2_pdu.changeNotificationRequest) or ischosen(msg.gtpcv2_pdu.relocationCancelRequest) or ischosen(msg.gtpcv2_pdu.configurationTransferTunnel) or ischosen(msg.gtpcv2_pdu.rAN_InformationRelay) or ischosen(msg.gtpcv2_pdu.suspendNotification) or ischosen(msg.gtpcv2_pdu.suspendAcknowledge) or ischosen(msg.gtpcv2_pdu.resumeNotification) or ischosen(msg.gtpcv2_pdu.resumeAcknowledge) or ischosen(msg.gtpcv2_pdu.cSPagingIndication) or ischosen(msg.gtpcv2_pdu.createForwardingTunnelRequest) or ischosen(msg.gtpcv2_pdu.deletePDN_ConnectionSetRequest) or ischosen(msg.gtpcv2_pdu.traceSessionActivation) or ischosen(msg.gtpcv2_pdu.traceSessionDeactivation) or ischosen(msg.gtpcv2_pdu.updatePDN_ConnectionSetRequest) or ischosen(msg.gtpcv2_pdu.pGW_RestartNotification) or ischosen(msg.gtpcv2_pdu.pGW_RestartNotificationAcknowledge) or ischosen(msg.gtpcv2_pdu.pGW_DownlinkTriggeringNotification) or ischosen(msg.gtpcv2_pdu.pGW_DownlinkTriggeringAcknowledge) or ischosen(msg.gtpcv2_pdu.alertMMENotification) or ischosen(msg.gtpcv2_pdu.alertMMEAcknowledge) or ischosen(msg.gtpcv2_pdu.uEActivityNotification) or ischosen(msg.gtpcv2_pdu.uEActivityAcknowledge) or ischosen(msg.gtpcv2_pdu.mBMSSessionStartRequest) or ischosen(msg.gtpcv2_pdu.mBMSSessionUpdateRequest) or ischosen(msg.gtpcv2_pdu.mBMSSessionStopRequest) or ischosen(msg.gtpcv2_pdu.iSR_StatusIndication) or ischosen(msg.gtpcv2_pdu.uE_RegistrationQueryRequest)) { return true; } return false; } private function f_init(Gtp2EmulationCfg cfg) runs on GTPv2_Emulation_CT { var Result res; map(self:GTP2C, system:GTP2C); res := GTPv2_CodecPort_CtrlFunct.f_IPL4_listen(GTP2C, cfg.gtpc_bind_ip, cfg.gtpc_bind_port, {udp:={}}); g_gtp2c_id := res.connId; g_restart_ctr := f_rnd_octstring(1); g_c_seq_nr := f_rnd_int(65535); g_gtp2_cfg := cfg; g_peer := { connId := g_gtp2c_id, remName := g_gtp2_cfg.gtpc_remote_ip, remPort := g_gtp2_cfg.gtpc_remote_port } } private function SendToUdMsgTable(Gtp2cUnitdata g2c_ud) runs on GTPv2_Emulation_CT { var GTP2_ConnHdlr vc_conn; for (var integer i := 0; i < sizeof(UdMsgTable); i := i + 1) { if (isbound(UdMsgTable[i].messageType)) { if (UdMsgTable[i].messageType == g2c_ud.gtpc.messageType) { vc_conn := UdMsgTable[i].vc_conn; CLIENT.send(g2c_ud.gtpc) to vc_conn; } } } return; } function main(Gtp2EmulationCfg cfg) runs on GTPv2_Emulation_CT { var Gtp2cUnitdata g2c_ud; var PDU_GTPCv2 g2c; var GTP2_ConnHdlr vc_conn; var hexstring imsi; var OCT1 messageType; var OCT4 teic; f_init(cfg); while (true) { alt { /* route inbound GTP2-C based on TEIC, SEQ or IMSI */ [] GTP2C.receive(Gtp2cUnitdata:?) -> value g2c_ud { var template hexstring imsi_t := f_gtp2c_extract_imsi(g2c_ud.gtpc); /* if this is a response, route by SEQ: */ if (match(g2c_ud.gtpc, tr_PDU_GTP2C_msgtypes(gtp2_responses)) and f_seq_known(g2c_ud.gtpc.sequenceNumber)) { vc_conn := f_comp_by_seq(g2c_ud.gtpc.sequenceNumber); CLIENT.send(g2c_ud.gtpc) to vc_conn; }else if (isvalue(imsi_t) and f_imsi_known(valueof(imsi_t))) { vc_conn := f_comp_by_imsi(valueof(imsi_t)); CLIENT.send(g2c_ud.gtpc) to vc_conn; } else if ((ispresent(g2c_ud.gtpc.tEID) and g2c_ud.gtpc.tEID != '00000000'O) and f_teic_known(g2c_ud.gtpc.tEID)) { vc_conn := f_comp_by_teic(g2c_ud.gtpc.tEID); CLIENT.send(g2c_ud.gtpc) to vc_conn; } else if ((not ispresent(g2c_ud.gtpc.tEID) or g2c_ud.gtpc.tEID == '00000000'O) and f_teic_known('00000000'O)) { vc_conn := f_comp_by_teic(g2c_ud.gtpc.tEID); CLIENT.send(g2c_ud.gtpc) to vc_conn; } else { SendToUdMsgTable(g2c_ud); if (not ispresent(g2c_ud.gtpc.tEID) or g2c_ud.gtpc.tEID == '00000000'O) { TEIC0.send(g2c_ud.gtpc); } } /* remove sequence number if response was received */ if (match(g2c_ud.gtpc, tr_PDU_GTP2C_msgtypes(gtp2_responses))) { f_seq_tbl_del(g2c_ud.gtpc.sequenceNumber); } } [] TEIC0.receive(PDU_GTPCv2:?) -> value g2c sender vc_conn { /* patch in the next sequence number on outbound Initial message */ if (f_gtp2c_is_initial_msg(g2c)) { g2c.sequenceNumber := int2oct(g_c_seq_nr, 3); g_c_seq_nr := g_c_seq_nr + 1; } /* build Gtp2cUnitdata */ g2c_ud := { peer := g_peer, gtpc := g2c }; GTP2C.send(g2c_ud); if (match(g2c, tr_PDU_GTP2C_msgtypes(gtp2_requests))) { f_seq_tbl_add(g2c.sequenceNumber, vc_conn); } } [] CLIENT.receive(PDU_GTPCv2:?) -> value g2c sender vc_conn { /* patch in the next sequence number on outbound Initial message */ if (f_gtp2c_is_initial_msg(g2c)) { g2c.sequenceNumber := int2oct(g_c_seq_nr, 3); g_c_seq_nr := g_c_seq_nr + 1; } /* build Gtp2cUnitdata */ g2c_ud := { peer := g_peer, gtpc := g2c }; GTP2C.send(g2c_ud); if (match(g2c, tr_PDU_GTP2C_msgtypes(gtp2_requests))) { f_seq_tbl_add(g2c.sequenceNumber, vc_conn); } } [] CLIENT_PROC.getcall(GTP2EM_register_imsi:{?}) -> param(imsi) sender vc_conn { f_imsi_tbl_add(imsi, vc_conn); CLIENT_PROC.reply(GTP2EM_register_imsi:{imsi}) to vc_conn; } [] CLIENT_PROC.getcall(GTP2EM_register_udmsg:{?}) -> param(messageType) sender vc_conn { f_udmsg_tbl_add(messageType, vc_conn); CLIENT_PROC.reply(GTP2EM_register_udmsg:{messageType}) to vc_conn; } [] CLIENT_PROC.getcall(GTP2EM_register_teic:{?}) -> param(teic) sender vc_conn { f_tid_tbl_add(teic, vc_conn); CLIENT_PROC.reply(GTP2EM_register_teic:{teic}) to vc_conn; } [] CLIENT_PROC.getcall(GTP2EM_allocate_teic:{}) -> sender vc_conn { var OCT4 t := f_alloc_teic(); f_tid_tbl_add(t, vc_conn); CLIENT_PROC.reply(GTP2EM_allocate_teic:{} value t) to vc_conn; } } } } /*********************************************************************** * Interaction between Main and Client Components ***********************************************************************/ type port GTP2EM_PT message { inout PDU_GTPCv2; } with { extension "internal" }; signature GTP2EM_register_imsi(hexstring imsi); signature GTP2EM_register_udmsg(OCT1 messageType); signature GTP2EM_register_teic(OCT4 teic); signature GTP2EM_allocate_teic() return OCT4; type port GTP2EM_PROC_PT procedure { inout GTP2EM_register_imsi, GTP2EM_register_udmsg, GTP2EM_register_teic, GTP2EM_allocate_teic; } with { extension "internal" }; /*********************************************************************** * Client Component ***********************************************************************/ type component GTP2_ConnHdlr { port GTP2EM_PT GTP2; port GTP2EM_PROC_PT GTP2_PROC; }; function f_gtp2_register_imsi(hexstring imsi) runs on GTP2_ConnHdlr { /* 15-digit IMSIs are len(imsi)=15, but decoded messages are * octet-aligned, hence the hexstring in messages is len(imsi)=16, where * the last hex char is a padding 'F'H */ imsi := f_pad_bcd_number(imsi); GTP2_PROC.call(GTP2EM_register_imsi:{imsi}) { [] GTP2_PROC.getreply(GTP2EM_register_imsi:{imsi}); } } function f_gtp2_register_udmsg(OCT1 messageType) runs on GTP2_ConnHdlr { GTP2_PROC.call(GTP2EM_register_udmsg:{messageType}) { [] GTP2_PROC.getreply(GTP2EM_register_udmsg:{messageType}); } } function f_gtp2_register_teic(OCT4 teic) runs on GTP2_ConnHdlr { GTP2_PROC.call(GTP2EM_register_teic:{teic}) { [] GTP2_PROC.getreply(GTP2EM_register_teic:{teic}); } } function f_gtp2_allocate_teic() runs on GTP2_ConnHdlr return OCT4 { var OCT4 t; GTP2_PROC.call(GTP2EM_allocate_teic:{}) { [] GTP2_PROC.getreply(GTP2EM_allocate_teic:{}) -> value t { return t; } } } }