136 lines
4.1 KiB
Plaintext
136 lines
4.1 KiB
Plaintext
module BSC_MS_ConnectionHandler {
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import from General_Types all;
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import from Osmocom_Types all;
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import from SCCPasp_Types all;
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import from BSSAP_Types all;
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import from BSSMAP_Emulation all;
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import from BSSMAP_Templates all;
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import from MobileL3_Types all;
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import from MobileL3_CommonIE_Types all;
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import from L3_Templates all;
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import from MGCP_Types all;
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import from MGCP_Templates all;
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import from SDP_Types all;
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/* this component represents a single subscriber connection at the MSC.
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* There is a 1:1 mapping between SCCP connections and BSSAP_ConnHdlr components.
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* We inherit all component variables, ports, functions, ... from BSSAP_ConnHdlr */
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type component BSC_MS_ConnHdlr extends BSSAP_ConnHdlr {
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/* SCCP Connecction Identifier for the underlying SCCP connection */
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var integer g_sccp_conn_id;
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var MgcpConnectionId g_mgcp_conn_id;
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var SDP_Message g_sdp;
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}
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/* Callback function from general BSSMAP_Emulation whenever a new incoming
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* SCCP connection arrivces. Must create + start a new component */
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private function CreateCallback(ASP_SCCP_N_CONNECT_ind conn_ind, charstring id)
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runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr {
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log("Incoming SCCP Connection on BSC ?!?");
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self.stop;
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}
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/* Callback function from general BSSMAP_Emulation whenever a connectionless
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* BSSMAP message arrives. Can retunr a PDU_BSSAP that should be sent in return */
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private function UnitdataCallback(PDU_BSSAP bssap)
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runs on BSSMAP_Emulation_CT return template PDU_BSSAP {
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var template PDU_BSSAP resp := omit;
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if (match(bssap, tr_BSSMAP_Reset)) {
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resp := ts_BSSMAP_ResetAck;
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}
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return resp;
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}
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const BssmapOps BSC_MS_BssmapOps := {
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create_cb := refers(CreateCallback),
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unitdata_cb := refers(UnitdataCallback)
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}
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function f_gen_cl3(hexstring imsi) return PDU_BSSAP {
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var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi));
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var PDU_ML3_MS_NW l3 := valueof(ts_CM_SERV_REQ('0001'B, mi));
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var BSSMAP_IE_CellIdentifier cell_id := valueof(ts_CellID_LAC_CI(23, 42));
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var PDU_BSSAP bssap := valueof(ts_BSSMAP_ComplL3(cell_id, enc_PDU_ML3_MS_NW(l3)));
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return bssap;
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}
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/* main function processing various incoming events */
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function main(SCCP_PAR_Address sccp_addr_own, SCCP_PAR_Address sccp_addr_remote)
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runs on BSC_MS_ConnHdlr {
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var PDU_BSSAP bssap;
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var MgcpCommand mgcp_cmd;
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var MgcpResponse mgcp_resp;
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log("Starting main of BSC_MS_ConnHdlr");
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g_mgcp_conn_id := f_mgcp_alloc_conn_id();
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/* generate and send the Complete Layer3 Info */
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bssap := f_gen_cl3('901770123456789'H);
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var BSSAP_Conn_Req creq := {
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addr_peer := sccp_addr_remote,
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addr_own := sccp_addr_own,
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bssap := bssap
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}
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BSSAP.send(creq);
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while (true) {
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/* TODO: Use an actual state machine to care about ordering */
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alt {
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/* new SCCP-level connection indication from BSC */
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[] BSSAP.receive(tr_BSSMAP_AssignmentReq) -> value bssap {
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/* TODO: Read CIC */
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/* respond with ASSIGNMENT COMPL */
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BSSAP.send(ts_BSSMAP_AssignmentComplete(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode));
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}
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/* CRCX -> OK */
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[] BSSAP.receive(tr_CRCX) -> value mgcp_cmd {
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g_sdp := valueof(ts_SDP("127.0.0.1", "127.0.0.1", "foo", "21", 1000, { "98" },
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{ valueof(ts_SDP_rtpmap(98, "AMR/8000")),
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valueof(ts_SDP_ptime(20)) }));
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/* respond with CRCX_ACK */
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BSSAP.send(ts_CRCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
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}
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/* MDCX -> OK */
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[] BSSAP.receive(tr_MDCX) -> value mgcp_cmd {
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/* respond with CRCX_ACK */
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BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
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}
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/* CLEAR COMMAND from MSC; respond with CLEAR COMPLETE) */
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[] BSSAP.receive(tr_BSSMAP_ClearCommand) -> value bssap {
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BSSAP.send(ts_BSSMAP_ClearComplete);
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/* FIXME: local release? */
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}
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/* DLCX -> OK */
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[] BSSAP.receive(tr_DLCX) -> value mgcp_cmd {
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BSSAP.send(ts_DLCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id));
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}
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[] BSSAP.receive(tr_BSSAP_DTAP) -> value bssap {
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var PDU_ML3_MS_NW l3 := dec_PDU_ML3_MS_NW(bssap.pdu.dtap);
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log("Unhandled DTAP ", l3);
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}
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[] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) {
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self.stop;
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}
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[] BSSAP.receive(PDU_BSSAP:?) -> value bssap {
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log("Received unhandled SCCP-CO: ", bssap);
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}
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}
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}
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}
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}
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