87 lines
2.6 KiB
Plaintext
87 lines
2.6 KiB
Plaintext
module MSC_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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/* 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 MSC_ConnHdlr extends BSSAP_ConnHdlr {
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/* E1 timeslot that is allocated to this component/connection */
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var uint5_t g_e1_timeslot;
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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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}
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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)
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runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr {
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var MSC_ConnHdlr vc_conn;
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/* Create a new BSSAP_ConnHdlr component */
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vc_conn := MSC_ConnHdlr.create;
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/* connect it to the port */
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connect(vc_conn:BSSAP, self:CLIENT);
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/* start it */
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vc_conn.start(MSC_ConnectionHandler.main(conn_ind.connectionId, conn_ind.connectionId));
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return vc_conn;
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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 MSC_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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/* main function processing various incoming events */
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function main(integer connection_id, integer timeslot) runs on MSC_ConnHdlr {
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g_sccp_conn_id := connection_id;
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g_e1_timeslot := 1; /* FIXME */
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while (true) {
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var PDU_BSSAP bssap;
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alt {
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/* new SCCP-level connection indication from BSC */
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[] BSSAP.receive(tr_BSSMAP_ComplL3) -> value bssap {
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/* respond with ASSIGNMENT CMD */
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BSSAP.send(ts_BSSMAP_AssignmentCmd(0, g_e1_timeslot));
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/* FIXME: Send MGCP */
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}
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/*
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[] BSSAP.receive(tr_BSSMAP_AssignmentCompl) {
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}
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[] BSSAP.receive(tr_BSSMAP_AssignmentFail) {
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}
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*/
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/* TODO: CLEAR REQUEST from BSS */
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/* TODO: CLEAR COMPLETE from BSS (response to CLEAR COMMAND) */
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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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