bscnat: Refactor MSC side code to allow different actions per test
Each test can now plug in different acctions to be done by the emulated MSC, by passing a BssmapCreateCallback RAN_Emaulation callback to f_init(). Old hardcoded behaviour (main()) is renamed and used in laready existing tests. New infrastructure provides a generic BssmapCreateCallback taking care of required boilerplate, so new tests/users only need to define a new callback calling that generic one with a function pointer where all test logic is implemented. Change-Id: Ic429420d0d95b6aacb6e5c44031b49c942ed544d
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@ -16,6 +16,7 @@ import from Osmocom_Types all;
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import from IPL4asp_Types all;
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import from IPA_Emulation all;
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import from RAN_Emulation all;
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import from MTP3asp_Types all;
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@ -24,6 +25,7 @@ import from SCCPasp_Types all;
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import from SCCP_Emulation all;
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import from MSC_Simulation all;
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import from MSC_ConnectionHandler all;
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import from BSC_MS_Simulation all;
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import from BSC_MS_ConnectionHandler all;
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@ -136,7 +138,7 @@ function f_init_vty(charstring id := "foo") runs on test_CT {
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f_vty_transceive(BSCNATVTY, "enable");
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}
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function f_init(void_fn_bsc_ms fn_bsc_ms, boolean use_osmux) runs on test_CT {
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function f_init(void_fn_bsc_ms fn_bsc_ms, BssmapCreateCallback cb_msc, boolean use_osmux) runs on test_CT {
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var integer i;
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var charstring id;
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@ -147,7 +149,9 @@ function f_init(void_fn_bsc_ms fn_bsc_ms, boolean use_osmux) runs on test_CT {
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f_init_MscState(msc[i], mp_msc_pc +i, mp_bsc_pc, mp_msc_ssn, mp_bsc_ssn);
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id := "MSC" & int2str(i);
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msc[i].MSC := MSC_CT.create(id);
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msc[i].MSC.start(MSC_Simulation.main(mp_msc_ip, mp_msc_port + i, msc[i].sccp_pars, msc[i].sccp_addr_own, id));
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msc[i].MSC.start(MSC_Simulation.main(mp_msc_ip, mp_msc_port + i,
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msc[i].sccp_pars, msc[i].sccp_addr_own,
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cb_msc, id));
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}
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/* Wait for bsc_nat to attach to MSC. Before that all BSC connections will be dropped */
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@ -186,7 +190,9 @@ function f_wait_finish(timer T) runs on test_CT {
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function f_TC_recv_dump(boolean use_osmux := false) runs on test_CT {
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timer T := 30.0;
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f_init(refers(bsc_ms_establish_fully), use_osmux);
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f_init(refers(bsc_ms_establish_fully),
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refers(CreateCallback_establish_fully),
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use_osmux);
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f_wait_finish(T);
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}
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@ -21,6 +21,8 @@ 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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type function void_fn_msc(charstring id) runs on MSC_ConnHdlr;
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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 RAN_ConnHdlr components.
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* We inherit all component variables, ports, functions, ... from RAN_ConnHdlr */
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@ -32,24 +34,38 @@ type component MSC_ConnHdlr extends RAN_ConnHdlr {
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var MgcpEndpoint g_ep_name;
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var MgcpCallId g_call_id;
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var MgcpConnectionId g_mgcp_conn_id;
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var MSC_TestHdlrParams g_pars;
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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(BSSAP_N_CONNECT_ind conn_ind, charstring id)
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runs on RAN_Emulation_CT return RAN_ConnHdlr {
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var MSC_ConnHdlr vc_conn;
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/* Create a new RAN_ConnHdlr component */
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vc_conn := MSC_ConnHdlr.create(g_ran_id & "-Conn-" & int2str(conn_ind.connectionId));
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/* connect it to the port */
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type record MSC_TestHdlrParams {
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integer connection_id,
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integer e1_timeslot
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};
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/* helper function to create and connect a MSC_ConnHdlr component */
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private function f_connect_handler(inout MSC_ConnHdlr vc_conn) runs on RAN_Emulation_CT {
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/* connect client BSSAP port to BSSAP dispatcher */
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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, g_next_e1_ts));
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/* increment next E1 timeslot */
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g_next_e1_ts := g_next_e1_ts + 1;
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}
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private function f_msc_start_handler(void_fn_msc fn, charstring id, template (omit) MSC_TestHdlrParams pars := omit)
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runs on RAN_Emulation_CT return MSC_ConnHdlr {
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var MSC_ConnHdlr vc_conn;
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vc_conn := MSC_ConnHdlr.create(id);
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f_connect_handler(vc_conn);
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vc_conn.start(f_handler_init(fn, id, pars));
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return vc_conn;
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}
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/* first function inside ConnHdlr component; sets g_pars + starts function */
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private function f_handler_init(void_fn_msc fn, charstring id, template (omit) MSC_TestHdlrParams pars := omit)
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runs on MSC_ConnHdlr {
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if (isvalue(pars)) {
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g_pars := valueof(pars);
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}
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fn.apply(id);
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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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@ -63,8 +79,25 @@ runs on RAN_Emulation_CT return template PDU_BSSAP {
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return resp;
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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_generic(void_fn_msc fn, BSSAP_N_CONNECT_ind conn_ind, charstring id)
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runs on RAN_Emulation_CT return RAN_ConnHdlr {
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var MSC_ConnHdlr vc_conn;
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var MSC_TestHdlrParams pars;
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pars.connection_id := conn_ind.connectionId;
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pars.e1_timeslot := g_next_e1_ts;
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/* Create a new RAN_ConnHdlr component */
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vc_conn := f_msc_start_handler(fn, g_ran_id & "-Conn-" & int2str(conn_ind.connectionId), pars);
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/* increment next E1 timeslot */
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g_next_e1_ts := g_next_e1_ts + 1;
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return vc_conn;
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}
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const RanOps MSC_RanOps := {
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create_cb := refers(CreateCallback),
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create_cb := omit,
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unitdata_cb := refers(UnitdataCallback),
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decode_dtap := false,
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role_ms := false,
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@ -84,14 +117,20 @@ type enumerated MSC_State {
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MSC_STATE_WAIT_DLCX_ACK
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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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function CreateCallback_establish_fully(BSSAP_N_CONNECT_ind conn_ind, charstring id)
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runs on RAN_Emulation_CT return RAN_ConnHdlr {
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return CreateCallback_generic(refers(f_msc_establish_fully), conn_ind, id);
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}
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/* main function processing various incoming events */
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function main(integer connection_id, integer e1_timeslot) runs on MSC_ConnHdlr {
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function f_msc_establish_fully(charstring id) runs on MSC_ConnHdlr {
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var MgcpResponse mgcp_rsp;
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timer T := 5.0;
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g_sccp_conn_id := connection_id;
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g_sccp_conn_id := g_pars.connection_id;
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g_call_id := f_mgcp_alloc_call_id();
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g_ep_name := hex2str(int2hex(e1_timeslot, 1)) & "@mgw";
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g_ep_name := hex2str(int2hex(g_pars.e1_timeslot, 1)) & "@mgw";
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/* we just accepted an incoming SCCP connection, start guard timer */
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T.start;
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@ -103,7 +142,7 @@ function main(integer connection_id, integer e1_timeslot) runs on MSC_ConnHdlr {
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[g_state == MSC_STATE_NONE] BSSAP.receive(tr_BSSMAP_ComplL3) -> value bssap {
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/* respond with ASSIGNMENT CMD */
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g_state := MSC_STATE_WAIT_ASS_COMPL;
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BSSAP.send(ts_BSSMAP_AssignmentReq(ts_BSSMAP_IE_CIC(0, e1_timeslot)));
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BSSAP.send(ts_BSSMAP_AssignmentReq(ts_BSSMAP_IE_CIC(0, g_pars.e1_timeslot)));
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}
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[g_state == MSC_STATE_WAIT_ASS_COMPL] BSSAP.receive(tr_BSSMAP_AssignmentComplete(?,*)) {
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/* FIXME: Send MGCP CRCX */
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@ -38,7 +38,8 @@ modulepar {
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function main(charstring local_ip, PortNumber local_port,
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MSC_SCCP_MTP3_parameters sccp_pars,
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SCCP_PAR_Address sccp_addr_own, charstring id) runs on MSC_CT
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SCCP_PAR_Address sccp_addr_own,
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BssmapCreateCallback cb, charstring id) runs on MSC_CT
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{
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/* create components */
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vc_IPA := IPA_Emulation_CT.create(id & "-IPA");
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@ -64,7 +65,10 @@ function main(charstring local_ip, PortNumber local_port,
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vc_IPA.start(IPA_Emulation.main_server(local_ip, local_port));
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vc_SCCP.start(SCCPStart(sccp_pars));
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vc_BSSMAP.start(RAN_Emulation.main(MSC_ConnectionHandler.MSC_RanOps, id & "-BSSMAP"));
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var RanOps ranops := MSC_ConnectionHandler.MSC_RanOps;
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ranops.create_cb := cb;
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vc_BSSMAP.start(RAN_Emulation.main(ranops, id & "-BSSMAP"));
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/* wait until termination of respective components */
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vc_IPA.done;
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