| module MSC_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; |
| |
| /* 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 MSC_ConnHdlr extends BSSAP_ConnHdlr { |
| /* E1 timeslot that is allocated to this component/connection */ |
| var uint5_t g_e1_timeslot; |
| /* 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 { |
| var MSC_ConnHdlr vc_conn; |
| /* Create a new BSSAP_ConnHdlr component */ |
| vc_conn := MSC_ConnHdlr.create; |
| /* connect it to the port */ |
| connect(vc_conn:BSSAP, self:CLIENT); |
| /* start it */ |
| vc_conn.start(MSC_ConnectionHandler.main(conn_ind.connectionId, conn_ind.connectionId)); |
| return vc_conn; |
| } |
| |
| /* 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 MSC_BssmapOps := { |
| create_cb := refers(CreateCallback), |
| unitdata_cb := refers(UnitdataCallback) |
| } |
| |
| /* main function processing various incoming events */ |
| function main(integer connection_id, integer timeslot) runs on MSC_ConnHdlr { |
| g_sccp_conn_id := connection_id; |
| g_e1_timeslot := timeslot |
| |
| while (true) { |
| var PDU_BSSAP bssap; |
| alt { |
| /* new SCCP-level connection indication from BSC */ |
| [] BSSAP.receive(tr_BSSMAP_ComplL3) -> value bssap { |
| /* respond with ASSIGNMENT CMD */ |
| BSSAP.send(ts_BSSMAP_AssignmentCmd(0, g_e1_timeslot)); |
| /* FIXME: Send MGCP */ |
| } |
| /* |
| [] BSSAP.receive(tr_BSSMAP_AssignmentCompl) { |
| } |
| [] BSSAP.receive(tr_BSSMAP_AssignmentFail) { |
| } |
| */ |
| /* TODO: CLEAR REQUEST from BSS */ |
| /* TODO: CLEAR COMPLETE from BSS (response to CLEAR COMMAND) */ |
| |
| [] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
| self.stop; |
| } |
| |
| [] BSSAP.receive(PDU_BSSAP:?) -> value bssap { |
| log("Received unhandled SCCP-CO: ", bssap); |
| } |
| } |
| } |
| } |
| |
| } |