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authorHarald Welte <laforge@gnumonks.org>2017-11-25 02:32:50 +0100
committerHarald Welte <laforge@gnumonks.org>2017-11-25 02:32:50 +0100
commit79feba5ed43f98b3be2a2e0b8f77ad69ec8c3c50 (patch)
treec2a0aadce2ed56fb794974c1aca7703a613cdfde /bsc-nat/BSC_MS_ConnectionHandler.ttcn
parent92632e1dce118ded7488398757a7bf3d4ea2c58a (diff)
rename 'ipa' directory to 'bsc-nat'
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1 files changed, 162 insertions, 0 deletions
diff --git a/bsc-nat/BSC_MS_ConnectionHandler.ttcn b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
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+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;
+ var BSC_State g_state;
+}
+
+/* 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, charstring id)
+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;
+}
+
+type enumerated BSC_State {
+ BSC_STATE_NONE,
+ BSC_STATE_WAIT_ASS_REQ,
+ BSC_STATE_WAIT_CRCX,
+ BSC_STATE_WAIT_MDCX,
+ BSC_STATE_WAIT_CLEAR_CMD,
+ BSC_STATE_WAIT_DLCX,
+ BSC_STATE_WAIT_DISC_IND
+}
+
+/* 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
+ }
+ g_state := BSC_STATE_WAIT_ASS_REQ;
+ BSSAP.send(creq);
+
+ while (true) {
+ alt {
+ /* new SCCP-level connection indication from BSC */
+ [g_state == BSC_STATE_WAIT_ASS_REQ] BSSAP.receive(tr_BSSMAP_AssignmentReq) -> value bssap {
+ /* FIXME: Read CIC */
+ /* respond with ASSIGNMENT COMPL */
+ g_state := BSC_STATE_WAIT_CRCX;
+ BSSAP.send(ts_BSSMAP_AssignmentComplete(bssap.pdu.bssmap.assignmentRequest.circuitIdentityCode));
+ }
+
+ /* CRCX -> OK */
+ [g_state == BSC_STATE_WAIT_CRCX] BSSAP.receive(tr_CRCX) -> value mgcp_cmd {
+ /* FIXME: proper SDP parameters */
+ 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 */
+ g_state := BSC_STATE_WAIT_MDCX;
+ BSSAP.send(ts_CRCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
+ }
+
+ /* MDCX -> OK */
+ [g_state == BSC_STATE_WAIT_MDCX] BSSAP.receive(tr_MDCX) -> value mgcp_cmd {
+ /* FIXME: verify if local part of endpoint name matches CIC */
+ /* respond with CRCX_ACK */
+ g_state := BSC_STATE_WAIT_CLEAR_CMD;
+ BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
+ }
+
+ /* CLEAR COMMAND from MSC; respond with CLEAR COMPLETE) */
+ [g_state == BSC_STATE_WAIT_CLEAR_CMD] BSSAP.receive(tr_BSSMAP_ClearCommand) -> value bssap {
+ g_state := BSC_STATE_WAIT_DLCX;
+ BSSAP.send(ts_BSSMAP_ClearComplete);
+ }
+
+ /* DLCX -> OK */
+ [g_state == BSC_STATE_WAIT_DLCX] BSSAP.receive(tr_DLCX) -> value mgcp_cmd {
+ /* FIXME: verify if local part of endpoint name matches CIC */
+ g_state := BSC_STATE_WAIT_DISC_IND;
+ BSSAP.send(ts_DLCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id));
+ }
+
+ [] BSSAP.receive(tr_BSSAP_DTAP) -> value bssap {
+ /* FIXME: verify if local part of endpoint name matches CIC */
+ var PDU_ML3_MS_NW l3 := dec_PDU_ML3_MS_NW(bssap.pdu.dtap);
+ log("Unhandled DTAP ", l3);
+ }
+
+ [g_state == BSC_STATE_WAIT_DISC_IND] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) {
+ setverdict(pass);
+ self.stop;
+ }
+
+ /* disconnect in invalid state */
+ [] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) {
+ setverdict(fail);
+ self.stop;
+ }
+
+
+ [] BSSAP.receive(PDU_BSSAP:?) -> value bssap {
+ log("Received unhandled SCCP-CO: ", bssap);
+ }
+ }
+ }
+}
+
+}