| 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; |
| |
| import from MGCP_Types all; |
| import from MGCP_Templates all; |
| import from SDP_Types 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; |
| var MgcpConnectionId g_mgcp_conn_id; |
| var SDP_Message g_sdp; |
| } |
| |
| /* 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; |
| var MgcpCommand mgcp_cmd; |
| var MgcpResponse mgcp_resp; |
| |
| log("Starting main of BSC_MS_ConnHdlr"); |
| |
| g_mgcp_conn_id := f_mgcp_alloc_conn_id(); |
| |
| /* 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) { |
| /* TODO: Use an actual state machine to care about ordering */ |
| alt { |
| /* new SCCP-level connection indication from BSC */ |
| [] BSSAP.receive(tr_BSSMAP_AssignmentReq) -> value bssap { |
| /* TODO: Read CIC */ |
| /* respond with ASSIGNMENT COMPL */ |
| BSSAP.send(ts_BSSMAP_AssignmentComplete(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode)); |
| } |
| |
| /* CRCX -> OK */ |
| [] BSSAP.receive(tr_CRCX) -> value mgcp_cmd { |
| g_sdp := valueof(ts_SDP("127.0.0.1", "127.0.0.1", "foo", "21", 1000, { "98" }, |
| { valueof(ts_SDP_rtpmap(98, "AMR/8000")), |
| valueof(ts_SDP_ptime(20)) })); |
| /* respond with CRCX_ACK */ |
| BSSAP.send(ts_CRCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp)); |
| } |
| |
| /* MDCX -> OK */ |
| [] BSSAP.receive(tr_MDCX) -> value mgcp_cmd { |
| /* respond with CRCX_ACK */ |
| BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp)); |
| } |
| |
| /* CLEAR COMMAND from MSC; respond with CLEAR COMPLETE) */ |
| [] BSSAP.receive(tr_BSSMAP_ClearCommand) -> value bssap { |
| BSSAP.send(ts_BSSMAP_ClearComplete); |
| /* FIXME: local release? */ |
| } |
| |
| /* DLCX -> OK */ |
| [] BSSAP.receive(tr_DLCX) -> value mgcp_cmd { |
| BSSAP.send(ts_DLCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id)); |
| } |
| |
| [] 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); |
| } |
| } |
| } |
| } |
| |
| } |