498 lines
16 KiB
Plaintext
498 lines
16 KiB
Plaintext
module SGsAP_Emulation {
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/* SGsAP Emulation, runs on top of SGsAP_CodecPort. It multiplexes/demultiplexes
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* the individual IMSIs/subscribers, so there can be separate TTCN-3 components handling
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* each of them.
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*
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* The SGsAP_Emulation.main() function processes SGsAP primitives from the SGsAP
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* socket via the SGsAP_CodecPort, and dispatches them to the per-IMSI components.
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*
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* For each new IMSI, the SgsapOps.create_cb() is called. It can create
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* or resolve a TTCN-3 component, and returns a component reference to which that IMSI
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* is routed/dispatched.
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*
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* If a pre-existing component wants to register to handle a future inbound IMSI, it can
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* do so by registering an "expect" with the expected IMSI.
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*
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* Inbound SGsAP messages without IMSI (such as RESET-IND/ACK) are dispatched to
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* the SgsapOps.unitdata_cb() callback, which is registered with an argument to the
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* main() function below.
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*
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* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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* All rights reserved.
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*
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* Released under the terms of GNU General Public License, Version 2 or
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* (at your option) any later version.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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import from SGsAP_CodecPort all;
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import from SGsAP_CodecPort_CtrlFunct all;
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import from SGsAP_Types all;
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import from SGsAP_Templates all;
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import from Osmocom_Types all;
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import from IPL4asp_Types all;
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import from DNS_Helpers all;
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import from MobileL3_Types all;
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type component SGsAP_ConnHdlr {
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port SGsAP_Conn_PT SGsAP;
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/* procedure based port to register for incoming connections */
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port SGsAPEM_PROC_PT SGsAP_PROC;
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}
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/* port between individual per-connection components and this dispatcher */
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type port SGsAP_Conn_PT message {
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inout PDU_SGsAP, PDU_ML3_MS_NW, PDU_ML3_NW_MS;
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} with { extension "internal" };
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/* represents a single SGsAP Association */
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type record AssociationData {
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SGsAP_ConnHdlr comp_ref,
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hexstring imsi optional
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};
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type component SGsAP_Emulation_CT {
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/* Port facing to the UDP SUT */
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port SGsAP_CODEC_PT SGsAP;
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/* All SGsAP_ConnHdlr SGsAP ports connect here
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* SGsAP_Emulation_CT.main needs to figure out what messages
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* to send where with CLIENT.send() to vc_conn */
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port SGsAP_Conn_PT SGsAP_CLIENT;
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/* currently tracked connections */
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var AssociationData SgsapAssociationTable[16];
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/* pending expected CRCX */
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var ExpectData SgsapExpectTable[8];
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/* procedure based port to register for incoming connections */
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port SGsAPEM_PROC_PT SGsAP_PROC;
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var charstring g_sgsap_id;
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var integer g_sgsap_conn_id := -1;
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}
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type function SGsAPCreateCallback(PDU_SGsAP msg, hexstring imsi, charstring id)
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runs on SGsAP_Emulation_CT return SGsAP_ConnHdlr;
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type function SGsAPUnitdataCallback(PDU_SGsAP msg)
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runs on SGsAP_Emulation_CT return template PDU_SGsAP;
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type record SGsAPOps {
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SGsAPCreateCallback create_cb,
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SGsAPUnitdataCallback unitdata_cb
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}
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type record SGsAP_conn_parameters {
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HostName remote_ip,
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PortNumber remote_sctp_port,
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HostName local_ip,
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PortNumber local_sctp_port
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}
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function tr_SGsAP_RecvFrom_R(template PDU_SGsAP msg)
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runs on SGsAP_Emulation_CT return template SGsAP_RecvFrom {
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var template SGsAP_RecvFrom mrf := {
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connId := g_sgsap_conn_id,
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remName := ?,
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remPort := ?,
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locName := ?,
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locPort := ?,
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msg := msg
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}
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return mrf;
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}
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private function f_imsi_known(hexstring imsi)
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runs on SGsAP_Emulation_CT return boolean {
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var integer i;
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for (i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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if (SgsapAssociationTable[i].imsi == imsi) {
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return true;
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}
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}
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return false;
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}
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private function f_comp_known(SGsAP_ConnHdlr client)
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runs on SGsAP_Emulation_CT return boolean {
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var integer i;
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for (i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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if (SgsapAssociationTable[i].comp_ref == client) {
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return true;
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}
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}
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return false;
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}
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private function f_comp_by_imsi(hexstring imsi)
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runs on SGsAP_Emulation_CT return SGsAP_ConnHdlr {
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var integer i;
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for (i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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if (SgsapAssociationTable[i].imsi == imsi) {
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return SgsapAssociationTable[i].comp_ref;
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}
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}
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setverdict(fail, "SGsAP Association Table not found by IMSI", imsi);
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mtc.stop;
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}
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private function f_imsi_by_comp(SGsAP_ConnHdlr client)
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runs on SGsAP_Emulation_CT return hexstring {
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var integer i;
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for (i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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if (SgsapAssociationTable[i].comp_ref == client) {
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return SgsapAssociationTable[i].imsi;
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}
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}
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setverdict(fail, "SGsAP Association Table not found by component ", client);
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mtc.stop;
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}
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private function f_imsi_table_add(SGsAP_ConnHdlr comp_ref, hexstring imsi)
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runs on SGsAP_Emulation_CT {
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var integer i;
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for (i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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if (not isvalue(SgsapAssociationTable[i].imsi)) {
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SgsapAssociationTable[i].imsi := imsi;
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SgsapAssociationTable[i].comp_ref := comp_ref;
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return;
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}
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}
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testcase.stop("SGsAP Association Table full!");
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}
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private function f_imsi_table_del(SGsAP_ConnHdlr comp_ref, hexstring imsi)
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runs on SGsAP_Emulation_CT {
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var integer i;
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for (i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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if (SgsapAssociationTable[i].comp_ref == comp_ref and
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SgsapAssociationTable[i].imsi == imsi) {
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SgsapAssociationTable[i].imsi := omit;
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SgsapAssociationTable[i].comp_ref := null;
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return;
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}
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}
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setverdict(fail, "SGsAP Association Table: Couldn't find to-be-deleted entry!");
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mtc.stop;
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}
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private function f_imsi_table_init()
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runs on SGsAP_Emulation_CT {
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for (var integer i := 0; i < sizeof(SgsapAssociationTable); i := i+1) {
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SgsapAssociationTable[i].comp_ref := null;
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SgsapAssociationTable[i].imsi := omit;
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}
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}
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private function f_SGsAP_get_imsi(PDU_SGsAP pdu) return template (omit) IMSI
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{
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if (ischosen(pdu.sGsAP_ALERT_ACK)) {
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return pdu.sGsAP_ALERT_ACK.iMSI;
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} else if (ischosen(pdu.sGsAP_ALERT_REJECT)) {
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return pdu.sGsAP_ALERT_REJECT.iMSI;
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} else if (ischosen(pdu.sGsAP_ALERT_REQUEST)) {
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return pdu.sGsAP_ALERT_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_DOWNLINK_UNITDATA)) {
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return pdu.sGsAP_DOWNLINK_UNITDATA.iMSI;
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} else if (ischosen(pdu.sGsAP_EPS_DETACH_ACK)) {
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return pdu.sGsAP_EPS_DETACH_ACK.iMSI;
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} else if (ischosen(pdu.sGsAP_EPS_DETACH_INDICATION)) {
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return pdu.sGsAP_EPS_DETACH_INDICATION.iMSI;
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} else if (ischosen(pdu.sGsAP_IMSI_DETACH_ACK)) {
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return pdu.sGsAP_IMSI_DETACH_ACK.iMSI;
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} else if (ischosen(pdu.sGsAP_IMSI_DETACH_INDICATION)) {
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return pdu.sGsAP_IMSI_DETACH_INDICATION.iMSI;
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} else if (ischosen(pdu.sGsAP_LOCATION_UPDATE_ACCEPT)) {
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return pdu.sGsAP_LOCATION_UPDATE_ACCEPT.iMSI;
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} else if (ischosen(pdu.sGsAP_LOCATION_UPDATE_REJECT)) {
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return pdu.sGsAP_LOCATION_UPDATE_REJECT.iMSI;
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} else if (ischosen(pdu.sGsAP_LOCATION_UPDATE_REQUEST)) {
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return pdu.sGsAP_LOCATION_UPDATE_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_MM_INFORMATION_REQUEST)) {
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return pdu.sGsAP_MM_INFORMATION_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_PAGING_REJECT)) {
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return pdu.sGsAP_PAGING_REJECT.iMSI;
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} else if (ischosen(pdu.sGsAP_PAGING_REQUEST)) {
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return pdu.sGsAP_PAGING_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_SERVICE_REQUEST)) {
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return pdu.sGsAP_SERVICE_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_STATUS)) {
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return pdu.sGsAP_STATUS.iMSI;
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} else if (ischosen(pdu.sGsAP_TMSI_REALLOCATION_COMPLETE)) {
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return pdu.sGsAP_TMSI_REALLOCATION_COMPLETE.iMSI;
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} else if (ischosen(pdu.sGsAP_UE_ACTIVITY_INDICATION)) {
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return pdu.sGsAP_UE_ACTIVITY_INDICATION.iMSI;
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} else if (ischosen(pdu.sGsAP_UE_UNREACHABLE)) {
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return pdu.sGsAP_UE_UNREACHABLE.iMSI;
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} else if (ischosen(pdu.sGsAP_UPLINK_UNITDATA)) {
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return pdu.sGsAP_UPLINK_UNITDATA.iMSI;
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} else if (ischosen(pdu.sGsAP_RELEASE_REQUEST)) {
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return pdu.sGsAP_RELEASE_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_SERVICE_ABORT_REQUEST)) {
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return pdu.sGsAP_SERVICE_ABORT_REQUEST.iMSI;
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} else if (ischosen(pdu.sGsAP_MO_CSFB_INDICATION)) {
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return pdu.sGsAP_MO_CSFB_INDICATION.iMSI;
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}
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return omit;
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}
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private template (value) SctpTuple ts_SCTP(template (omit) integer ppid := omit) := {
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sinfo_stream := omit,
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sinfo_ppid := ppid,
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remSocks := omit,
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assocId := omit
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};
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private template PortEvent tr_SctpAssocChange := {
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sctpEvent := {
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sctpAssocChange := ?
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}
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}
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private template PortEvent tr_SctpPeerAddrChange := {
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sctpEvent := {
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sctpPeerAddrChange := ?
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}
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}
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private function f_sgsap_xceive(template (value) PDU_SGsAP tx,
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template PDU_SGsAP rx_t := ?)
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runs on SGsAP_Emulation_CT return PDU_SGsAP {
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timer T := 10.0;
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var SGsAP_RecvFrom mrf;
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SGsAP.send(t_SGsAP_Send(g_sgsap_conn_id, tx));
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alt {
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[] SGsAP.receive(tr_SGsAP_RecvFrom_R(rx_t)) -> value mrf { }
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[] SGsAP.receive(tr_SctpAssocChange) { repeat; }
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[] SGsAP.receive(tr_SctpPeerAddrChange) { repeat; }
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[] T.timeout {
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setverdict(fail, "Timeout waiting for ", rx_t);
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mtc.stop;
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}
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}
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return mrf.msg;
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}
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function main(SGsAPOps ops, SGsAP_conn_parameters p, charstring id) runs on SGsAP_Emulation_CT {
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var Result res;
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g_sgsap_id := id;
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f_imsi_table_init();
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f_expect_table_init();
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map(self:SGsAP, system:SGsAP_CODEC_PT);
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if (p.remote_sctp_port == -1) {
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res := SGsAP_CodecPort_CtrlFunct.f_IPL4_listen(SGsAP, p.local_ip, p.local_sctp_port, { sctp := valueof(ts_SCTP) });
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} else {
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res := SGsAP_CodecPort_CtrlFunct.f_IPL4_connect(SGsAP, p.remote_ip, p.remote_sctp_port,
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p.local_ip, p.local_sctp_port, -1, { sctp := valueof(ts_SCTP) });
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}
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if (not ispresent(res.connId)) {
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setverdict(fail, "Could not connect SGsAP socket, check your configuration");
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mtc.stop;
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}
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g_sgsap_conn_id := res.connId;
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while (true) {
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var SGsAP_ConnHdlr vc_conn;
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var PDU_ML3_MS_NW l3_mo;
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var PDU_ML3_NW_MS l3_mt;
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var template IMSI imsi_t;
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var hexstring imsi;
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var SGsAP_RecvFrom mrf;
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var PDU_SGsAP msg;
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var charstring vlr_name, mme_name;
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alt {
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/* SGsAP from client */
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[] SGsAP_CLIENT.receive(PDU_SGsAP:?) -> value msg sender vc_conn {
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/* Pass message through */
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/* TODO: check which ConnectionID client has allocated + store in table? */
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SGsAP.send(t_SGsAP_Send(g_sgsap_conn_id, msg));
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}
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/* DTAP/MobileL3 from client (emulated MS): wrap in SGsAP-UL-UD and send */
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[] SGsAP_CLIENT.receive(PDU_ML3_MS_NW:?) -> value l3_mo sender vc_conn {
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var octetstring l3_enc := enc_PDU_ML3_MS_NW(l3_mo);
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imsi := f_imsi_by_comp(vc_conn);
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msg := valueof(ts_SGsAP_UL_UD(imsi, l3_enc));
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SGsAP.send(t_SGsAP_Send(g_sgsap_conn_id, msg));
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}
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[] SGsAP_CLIENT.receive(PDU_ML3_NW_MS:?) -> value l3_mt sender vc_conn {
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var octetstring l3_enc := enc_PDU_ML3_NW_MS(l3_mt);
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imsi := f_imsi_by_comp(vc_conn);
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msg := valueof(ts_SGsAP_DL_UD(imsi, l3_enc));
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SGsAP.send(t_SGsAP_Send(g_sgsap_conn_id, msg));
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}
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/* DTAP/MobileL3 from MSC/VLR to MS wrapped in SGsAP-DL-UD: Extract, decode, forward */
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[] SGsAP.receive(tr_SGsAP_RecvFrom_R(tr_SGsAP_DL_UD(?,?))) -> value mrf {
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var octetstring l3_enc := mrf.msg.sGsAP_DOWNLINK_UNITDATA.nAS_MessageContainer.nAS_MessageContainer;
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imsi := mrf.msg.sGsAP_DOWNLINK_UNITDATA.iMSI.iMSI.digits;
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vc_conn := f_comp_by_imsi(imsi);
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l3_mt := dec_PDU_ML3_NW_MS(l3_enc);
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SGsAP_CLIENT.send(l3_mt) to vc_conn;
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}
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[] SGsAP.receive(tr_SGsAP_RecvFrom_R(tr_SGsAP_UL_UD(?,?))) -> value mrf {
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var octetstring l3_enc := mrf.msg.sGsAP_UPLINK_UNITDATA.nAS_MessageContainer.nAS_MessageContainer;
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imsi := mrf.msg.sGsAP_UPLINK_UNITDATA.iMSI.iMSI.digits;
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l3_mo := dec_PDU_ML3_MS_NW(l3_enc);
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vc_conn := f_comp_by_imsi(imsi);
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SGsAP_CLIENT.send(l3_mo) to vc_conn;
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}
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/* any other SGsAP from MSC/VLR */
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[] SGsAP.receive(tr_SGsAP_RecvFrom_R(?)) -> value mrf {
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imsi_t := f_SGsAP_get_imsi(mrf.msg);
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if (isvalue(imsi_t)) {
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imsi := valueof(imsi_t.iMSI.digits);
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if (f_imsi_known(imsi)) {
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vc_conn := f_comp_by_imsi(imsi);
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SGsAP_CLIENT.send(mrf.msg) to vc_conn;
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} else {
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vc_conn := ops.create_cb.apply(mrf.msg, imsi, id);
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f_imsi_table_add(vc_conn, imsi);
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SGsAP_CLIENT.send(mrf.msg) to vc_conn;
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}
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} else {
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/* message contained no IMSI; is not IMSI-oriented */
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var template PDU_SGsAP resp := ops.unitdata_cb.apply(mrf.msg);
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if (isvalue(resp)) {
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SGsAP.send(t_SGsAP_Send(g_sgsap_conn_id, valueof(resp)));
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}
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}
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}
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[] SGsAP.receive(tr_SctpAssocChange) { }
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[] SGsAP.receive(tr_SctpPeerAddrChange) { }
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[] SGsAP_PROC.getcall(SGsAPEM_register:{?,?}) -> param(imsi, vc_conn) {
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f_create_expect(imsi, vc_conn);
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SGsAP_PROC.reply(SGsAPEM_register:{imsi, vc_conn}) to vc_conn;
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}
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[] SGsAP_PROC.getcall(SGsAPEM_reset_mme:{?,-}) -> param(mme_name) {
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var octetstring mme_enc, vlr_enc;
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mme_enc := f_enc_dns_hostname(mme_name);
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msg := f_sgsap_xceive(ts_SGsAP_RESET_IND_MME(mme_enc));
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vlr_enc := msg.sGsAP_RESET_ACK.vLR_Name.name;
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vlr_name := f_dec_dns_hostname(vlr_enc);
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SGsAP_PROC.reply(SGsAPEM_reset_mme:{mme_name, vlr_name});
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}
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[] SGsAP_PROC.getcall(SGsAPEM_reset_vlr:{?,-}) -> param(vlr_name) {
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var octetstring mme_enc, vlr_enc;
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vlr_enc := f_enc_dns_hostname(vlr_name);
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msg := f_sgsap_xceive(ts_SGsAP_RESET_IND_VLR(vlr_enc));
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mme_enc := msg.sGsAP_RESET_ACK.mME_Name.name;
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mme_name := f_dec_dns_hostname(mme_enc);
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SGsAP_PROC.reply(SGsAPEM_reset_vlr:{vlr_name, mme_name});
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}
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}
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}
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}
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/* "Expect" Handling */
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type record ExpectData {
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hexstring imsi optional,
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SGsAP_ConnHdlr vc_conn
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}
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signature SGsAPEM_register(in hexstring imsi, in SGsAP_ConnHdlr hdlr);
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signature SGsAPEM_reset_vlr(in charstring vlr_name, out charstring mme_name);
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signature SGsAPEM_reset_mme(in charstring mme_name, out charstring vlr_name);
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type port SGsAPEM_PROC_PT procedure {
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inout SGsAPEM_register, SGsAPEM_reset_vlr, SGsAPEM_reset_mme;
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} with { extension "internal" };
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/* Function that can be used as create_cb and will usse the expect table */
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function ExpectedCreateCallback(PDU_SGsAP msg, hexstring imsi, charstring id)
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runs on SGsAP_Emulation_CT return SGsAP_ConnHdlr {
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var SGsAP_ConnHdlr ret := null;
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var integer i;
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for (i := 0; i < sizeof(SgsapExpectTable); i := i+1) {
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if (not ispresent(SgsapExpectTable[i].imsi)) {
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continue;
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}
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if (imsi == SgsapExpectTable[i].imsi) {
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ret := SgsapExpectTable[i].vc_conn;
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/* Release this entry */
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SgsapExpectTable[i].imsi := omit;
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SgsapExpectTable[i].vc_conn := null;
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log("Found Expect[", i, "] for ", msg, " handled at ", ret);
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return ret;
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}
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}
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setverdict(fail, "Couldn't find Expect for ", msg);
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mtc.stop;
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}
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private function f_create_expect(hexstring imsi, SGsAP_ConnHdlr hdlr)
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runs on SGsAP_Emulation_CT {
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var integer i;
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/* Check an entry like this is not already presnt */
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for (i := 0; i < sizeof(SgsapExpectTable); i := i+1) {
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if (imsi == SgsapExpectTable[i].imsi) {
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setverdict(fail, "IMSI already present", imsi);
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mtc.stop;
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}
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}
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for (i := 0; i < sizeof(SgsapExpectTable); i := i+1) {
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if (not ispresent(SgsapExpectTable[i].imsi)) {
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SgsapExpectTable[i].imsi := imsi;
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SgsapExpectTable[i].vc_conn := hdlr;
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log("Created Expect[", i, "] for ", imsi, " to be handled at ", hdlr);
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return;
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}
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}
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testcase.stop("No space left in SgsapExpectTable")
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}
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/* client/conn_hdlr side function to use procedure port to create expect in emulation */
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function f_create_sgsap_expect(hexstring imsi) runs on SGsAP_ConnHdlr {
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SGsAP_PROC.call(SGsAPEM_register:{imsi, self}) {
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[] SGsAP_PROC.getreply(SGsAPEM_register:{?,?}) {};
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}
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}
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/* client/conn_hdlr side function to use procedure port to send RESET from emulated MME */
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function f_sgsap_reset_mme(charstring mme_name) runs on SGsAP_ConnHdlr return charstring {
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var charstring vlr_name;
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SGsAP_PROC.call(SGsAPEM_reset_mme:{mme_name, -}) {
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[] SGsAP_PROC.getreply(SGsAPEM_reset_mme:{mme_name,?}) -> param(vlr_name) {
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return vlr_name;
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};
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}
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}
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/* client/conn_hdlr side function to use procedure port to send RESET from emulated VLR */
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function f_sgsap_reset_vlr(charstring vlr_name) runs on SGsAP_ConnHdlr return charstring {
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var charstring mme_name;
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SGsAP_PROC.call(SGsAPEM_reset_vlr:{vlr_name, -}) {
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[] SGsAP_PROC.getreply(SGsAPEM_reset_vlr:{vlr_name,?}) -> param(mme_name) {
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return mme_name;
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};
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}
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}
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private function f_expect_table_init()
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runs on SGsAP_Emulation_CT {
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var integer i;
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for (i := 0; i < sizeof(SgsapExpectTable); i := i + 1) {
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SgsapExpectTable[i].imsi := omit;
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}
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}
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function DummyUnitdataCallback(PDU_SGsAP msg)
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runs on SGsAP_Emulation_CT return template PDU_SGsAP {
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log("Ignoring SGsAP ", msg);
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return omit;
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}
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}
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