274 lines
7.7 KiB
Plaintext
274 lines
7.7 KiB
Plaintext
module NS_Emulation {
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import from NS_Types all;
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import from BSSGP_Types all;
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import from Osmocom_Gb_Types all;
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import from NS_CodecPort all;
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import from NS_CodecPort_CtrlFunct all;
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import from IPL4asp_Types all;
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type record NsUnitdataRequest {
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BssgpBvci bvci,
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Nsei nsei,
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octetstring sdu optional,
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PDU_BSSGP bssgp optional
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}
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template NsUnitdataRequest t_NsUdReq(template Nsei nsei, template BssgpBvci bvci, template octetstring sdu,
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template PDU_BSSGP bssgp) := {
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bvci := bvci,
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nsei := nsei,
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sdu := sdu,
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bssgp := bssgp
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}
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type record NsUnitdataIndication {
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BssgpBvci bvci,
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Nsei nsei,
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octetstring sdu optional,
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PDU_BSSGP bssgp optional
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}
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template NsUnitdataIndication t_NsUdInd(Nsei nsei, BssgpBvci bvci, octetstring sdu) := {
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bvci := bvci,
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nsei := nsei,
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sdu := sdu,
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bssgp := dec_PDU_BSSGP(sdu)
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}
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type record NsStatusIndication {
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Nsei nsei,
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Nsvci nsvci,
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NseState old_state,
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NseState new_state
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}
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template NsStatusIndication t_NsStsInd(Nsei nsei, Nsvci nsvci, NseState old_state, NseState state) := {
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nsei := nsei,
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nsvci := nsvci,
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old_state := old_state,
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new_state := state
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}
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type enumerated NseState {
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NSE_S_DEAD_BLOCKED,
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NSE_S_WAIT_RESET,
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NSE_S_ALIVE_BLOCKED,
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NSE_S_ALIVE_UNBLOCKED
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}
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/* port from our (internal) point of view */
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type port NS_SP_PT message {
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in NsUnitdataRequest;
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out NsUnitdataIndication,
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NsStatusIndication,
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ASP_Event;
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} with { extension "internal" };
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/* port from the user point of view */
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type port NS_PT message {
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in ASP_Event,
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NsStatusIndication,
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NsUnitdataIndication;
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out NsUnitdataRequest;
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} with { extension "internal" };
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function NSStart() runs on NS_CT {
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f_init();
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f_ScanEvents();
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}
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private function f_init() runs on NS_CT {
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var Result res;
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/* Connect the UDP socket */
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res := f_IPL4_connect(NSCP, mp_remote_ip, mp_remote_udp_port, mp_local_ip, mp_local_udp_port, 0, { udp := {}});
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g_conn_id := res.connId;
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f_change_state(NSE_S_DEAD_BLOCKED);
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/* Send the first NS-ALIVE to test the connection */
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f_sendReset();
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}
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type component NS_CT {
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/* UDP port towards the bottom (IUT) */
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port NS_CODEC_PT NSCP;
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/* NS-User SAP towards the user */
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port NS_SP_PT NS_SP;
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var NseState g_state := NSE_S_DEAD_BLOCKED;
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var ConnectionId g_conn_id := -1;
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timer Tns_alive := 3.0;
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timer Tns_test := 10.0;
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timer Tns_block := 10.0;
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}
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modulepar {
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PortNumber mp_local_udp_port := 23000;
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charstring mp_local_ip := "127.0.0.1";
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PortNumber mp_remote_udp_port := 21000;
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charstring mp_remote_ip := "127.0.0.1";
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Nsvci mp_nsvci := 0;
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Nsvci mp_nsei := 2342;
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};
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private function f_change_state(NseState new_state) runs on NS_CT {
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var NseState old_state := g_state;
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g_state := new_state;
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log("NS State Transition: ", old_state, " -> ", new_state);
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NS_SP.send(t_NsStsInd(mp_nsei, mp_nsvci, old_state, new_state));
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}
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private function f_sendReset() runs on NS_CT {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_RESET(NS_CAUSE_OM_INTERVENTION, mp_nsvci, mp_nsei)));
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g_state := NSE_S_WAIT_RESET;
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}
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private function f_sendAlive() runs on NS_CT {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_ALIVE));
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Tns_alive.start;
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}
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private function f_sendUnblock() runs on NS_CT {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_UNBLOCK));
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Tns_block.start;
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}
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private function f_sendBlock(NsCause cause) runs on NS_CT {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_BLOCK(cause, mp_nsvci)));
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Tns_block.start;
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}
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altstep as_allstate() runs on NS_CT {
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var NS_RecvFrom rf;
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var ASP_Event evt;
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/* transition to DEAD if t_alive times out */
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[Tns_alive.running] Tns_alive.timeout {
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log("Tns-alive expired: changing to DEAD_BLOCKED + starting Tns-test");
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f_change_state(NSE_S_DEAD_BLOCKED);
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Tns_test.start;
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}
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[Tns_test.running] Tns_test.timeout {
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log("Tns-test expired: sending NS-ALIVE");
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f_sendAlive();
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}
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/* Stop t_alive when receiving ALIVE-ACK */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_ALIVE_ACK)) {
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log("NS-ALIVE-ACK received: stopping Tns-alive; starting Tns-test");
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Tns_alive.stop;
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Tns_test.start;
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}
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/* respond to NS-ALIVE with NS-ALIVE-ACK */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_ALIVE)) {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_ALIVE_ACK));
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}
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/* Respond to BLOCK for wrong NSVCI */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_BLOCK(?, ?))) -> value rf {
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log("Rx NS-BLOCK for unknown NSVCI");
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/* FIXME */
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}
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/* Respond to RESET with correct NSEI/NSVCI */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_RESET(?, mp_nsvci, mp_nsei))) -> value rf {
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f_change_state(NSE_S_ALIVE_BLOCKED);
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NSCP.send(t_NS_Send(g_conn_id, t_NS_RESET_ACK(mp_nsvci, mp_nsei)));
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}
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/* Respond to RESET with wrong NSEI/NSVCI */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_RESET(?, ?, ?))) -> value rf {
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log("Rx NS-RESET for unknown NSEI/NSVCI");
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/* FIXME */
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}
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/* default case of handling unknown PDUs */
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[] NSCP.receive(t_NS_RecvFrom(?)) -> value rf {
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log("Rx Unexpected NS PDU ", rf.msg," in state ", g_state);
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NSCP.send(t_NS_Send(g_conn_id, ts_NS_STATUS(NS_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, rf.msg)));
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}
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/* Forwarding of ASP_Evet to user */
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[] NSCP.receive(ASP_Event:?) -> value evt { NS_SP.send(evt); }
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}
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private function f_ScanEvents() runs on NS_CT {
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var NsUnitdataRequest ud_req;
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var NS_RecvFrom rf;
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var default d;
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d := activate(as_allstate());
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while (true) {
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if (g_state == NSE_S_DEAD_BLOCKED) {
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alt {
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[false] any timer.timeout {}
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}
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} else if (g_state == NSE_S_WAIT_RESET) {
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alt {
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[] NSCP.receive(t_NS_RecvFrom(t_NS_RESET_ACK(mp_nsvci, mp_nsei))) -> value rf {
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f_change_state(NSE_S_ALIVE_BLOCKED);
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f_sendAlive();
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f_sendUnblock();
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}
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}
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} else if (g_state == NSE_S_ALIVE_BLOCKED) {
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alt {
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/* bogus block, just respond with ACK */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_BLOCK(?, mp_nsvci))) -> value rf {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_BLOCK_ACK(mp_nsvci)));
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}
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/* Respond to UNBLOCK with UNBLOCK-ACK + change state */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_UNBLOCK)) -> value rf {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_UNBLOCK_ACK));
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Tns_block.stop;
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f_change_state(NSE_S_ALIVE_UNBLOCKED);
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}
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[] NSCP.receive(t_NS_RecvFrom(t_NS_UNBLOCK_ACK)) -> value rf {
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Tns_block.stop;
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f_change_state(NSE_S_ALIVE_UNBLOCKED);
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}
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[] Tns_block.timeout {
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/* repeat unblock transmission */
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f_sendUnblock();
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}
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}
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} else if (g_state == NSE_S_ALIVE_UNBLOCKED) {
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alt {
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/* bogus unblock, just respond with ACK */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_UNBLOCK)) -> value rf {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_UNBLOCK_ACK));
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}
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/* Respond to BLOCK with BLOCK-ACK + change state */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_BLOCK(?, mp_nsvci))) -> value rf {
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NSCP.send(t_NS_Send(g_conn_id, t_NS_BLOCK_ACK(mp_nsvci)));
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Tns_block.stop;
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f_change_state(NSE_S_ALIVE_BLOCKED);
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}
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[] NSCP.receive(t_NS_RecvFrom(t_NS_BLOCK_ACK(mp_nsvci))) -> value rf {
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Tns_block.stop;
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}
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/* NS-UNITDATA PDU from network to NS-UNITDATA.ind to user */
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[] NSCP.receive(t_NS_RecvFrom(t_NS_UNITDATA(?, ?, ?))) -> value rf {
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NS_SP.send(t_NsUdInd(mp_nsei,
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oct2int(rf.msg.pDU_NS_Unitdata.bVCI),
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rf.msg.pDU_NS_Unitdata.nS_SDU));
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}
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/* NS-UNITDATA.req from user to NS-UNITDATA PDU on network */
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[] NS_SP.receive(t_NsUdReq(mp_nsei, ?, ?, omit)) -> value ud_req {
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/* using raw octetstring PDU */
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NSCP.send(t_NS_Send(g_conn_id, t_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, ud_req.sdu)));
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}
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[] NS_SP.receive(t_NsUdReq(mp_nsei, ?, omit, ?)) -> value ud_req {
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/* using decoded BSSGP PDU that we need to encode first */
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var octetstring enc := enc_PDU_BSSGP(ud_req.bssgp);
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NSCP.send(t_NS_Send(g_conn_id, t_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, enc)));
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}
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}
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}
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} /* while */
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//deactivate(d);
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}
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}
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