ipa: First version that emulates both MSC and BSC up to ASSIGNMENT REQ
diff --git a/ipa/BSC_MS_ConnectionHandler.ttcn b/ipa/BSC_MS_ConnectionHandler.ttcn
new file mode 100644
index 0000000..443babe
--- /dev/null
+++ b/ipa/BSC_MS_ConnectionHandler.ttcn
@@ -0,0 +1,105 @@
+module BSC_MS_ConnectionHandler {
+
+import from General_Types all;
+import from Osmocom_Types all;
+import from SCCPasp_Types all;
+import from BSSAP_Types all;
+import from BSSMAP_Emulation all;
+import from BSSMAP_Templates all;
+
+import from MobileL3_Types all;
+import from MobileL3_CommonIE_Types all;
+import from L3_Templates all;
+
+/* this component represents a single subscriber connection at the MSC.
+ * There is a 1:1 mapping between SCCP connections and BSSAP_ConnHdlr components.
+ * We inherit all component variables, ports, functions, ... from BSSAP_ConnHdlr */
+type component BSC_MS_ConnHdlr extends BSSAP_ConnHdlr {
+ /* SCCP Connecction Identifier for the underlying SCCP connection */
+ var integer g_sccp_conn_id;
+}
+
+/* Callback function from general BSSMAP_Emulation whenever a new incoming
+ * SCCP connection arrivces. Must create + start a new component */
+private function CreateCallback(ASP_SCCP_N_CONNECT_ind conn_ind)
+runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr {
+ log("Incoming SCCP Connection on BSC ?!?");
+ self.stop;
+}
+
+/* Callback function from general BSSMAP_Emulation whenever a connectionless
+ * BSSMAP message arrives. Can retunr a PDU_BSSAP that should be sent in return */
+private function UnitdataCallback(PDU_BSSAP bssap)
+runs on BSSMAP_Emulation_CT return template PDU_BSSAP {
+ var template PDU_BSSAP resp := omit;
+
+ if (match(bssap, tr_BSSMAP_Reset)) {
+ resp := ts_BSSMAP_ResetAck;
+ }
+
+ return resp;
+}
+
+const BssmapOps BSC_MS_BssmapOps := {
+ create_cb := refers(CreateCallback),
+ unitdata_cb := refers(UnitdataCallback)
+}
+
+
+function f_gen_cl3(hexstring imsi) return PDU_BSSAP {
+ var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi));
+ var PDU_ML3_MS_NW l3 := valueof(ts_CM_SERV_REQ('0001'B, mi));
+ var BSSMAP_IE_CellIdentifier cell_id := valueof(ts_CellID_LAC_CI(23, 42));
+ var PDU_BSSAP bssap := valueof(ts_BSSMAP_ComplL3(cell_id, enc_PDU_ML3_MS_NW(l3)));
+ return bssap;
+}
+
+/* main function processing various incoming events */
+function main(SCCP_PAR_Address sccp_addr_own, SCCP_PAR_Address sccp_addr_remote)
+runs on BSC_MS_ConnHdlr {
+ var PDU_BSSAP bssap;
+
+ log("Starting main of BSC_MS_ConnHdlr");
+
+ /* generate and send the Complete Layer3 Info */
+ bssap := f_gen_cl3('901770123456789'H);
+
+ var BSSAP_Conn_Req creq := {
+ addr_peer := sccp_addr_remote,
+ addr_own := sccp_addr_own,
+ bssap := bssap
+ }
+ BSSAP.send(creq);
+
+ while (true) {
+ alt {
+ /* new SCCP-level connection indication from BSC */
+ [] BSSAP.receive(tr_BSSMAP_AssignmentCmd) -> value bssap {
+ /* TODO: Read CIC */
+ /* respond with ASSIGNMENT COMPL */
+ BSSAP.send(ts_BSSMAP_AssignmentComplete(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode));
+ }
+ /* TODO: CLEAR REQUEST from BSS */
+ /* CLEAR COMMAND from MSC; respond with CLEAR COMPLETE) */
+ [] BSSAP.receive(tr_BSSMAP_ClearCommand) -> value bssap {
+ BSSAP.send(ts_BSSMAP_ClearComplete);
+ /* FIXME: local release? */
+ }
+
+ [] BSSAP.receive(tr_BSSAP_DTAP) -> value bssap {
+ var PDU_ML3_MS_NW l3 := dec_PDU_ML3_MS_NW(bssap.pdu.dtap);
+ log("Unhandled DTAP ", l3);
+ }
+
+ [] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) {
+ self.stop;
+ }
+
+ [] BSSAP.receive(PDU_BSSAP:?) -> value bssap {
+ log("Received unhandled SCCP-CO: ", bssap);
+ }
+ }
+ }
+}
+
+}