| module BSC_MS_ConnectionHandler { |
| |
| /* (C) 2017-2019 Harald Welte <laforge@gnumonks.org> |
| * All rights reserved. |
| * |
| * Released under the terms of GNU General Public License, Version 2 or |
| * (at your option) any later version. |
| * |
| * SPDX-License-Identifier: GPL-2.0-or-later |
| */ |
| |
| import from General_Types all; |
| import from Osmocom_Types all; |
| import from SCCPasp_Types all; |
| import from BSSAP_Types all; |
| import from BSSAP_CodecPort all; |
| import from RAN_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 RAN_ConnHdlr components. |
| * We inherit all component variables, ports, functions, ... from RAN_ConnHdlr */ |
| type component BSC_MS_ConnHdlr extends RAN_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 RAN_Emulation whenever a new incoming |
| * SCCP connection arrivces. Must create + start a new component */ |
| private function CreateCallback(BSSAP_N_CONNECT_ind conn_ind, charstring id) |
| runs on RAN_Emulation_CT return RAN_ConnHdlr { |
| log("Incoming SCCP Connection on BSC ?!?"); |
| self.stop; |
| } |
| |
| /* Callback function from general RAN_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 RAN_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 RanOps BSC_MS_RanOps := { |
| create_cb := refers(CreateCallback), |
| unitdata_cb := refers(UnitdataCallback), |
| decode_dtap := false, |
| role_ms := true, |
| protocol := RAN_PROTOCOL_BSSAP, |
| use_osmux := false, |
| sccp_addr_local := omit, |
| sccp_addr_peer := omit |
| } |
| |
| |
| 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(CM_TYPE_MO_CALL, 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_MDCX2, |
| 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 MDCX_ACK */ |
| g_state := BSC_STATE_WAIT_MDCX2; |
| BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp)); |
| } |
| |
| /* MDCX -> OK */ |
| [g_state == BSC_STATE_WAIT_MDCX2] BSSAP.receive(tr_MDCX) -> value mgcp_cmd { |
| /* FIXME: verify if local part of endpoint name matches CIC */ |
| /* respond with MDCX_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(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
| setverdict(pass); |
| self.stop; |
| } |
| |
| [] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_CONF_IND) { |
| } |
| |
| /* disconnect in invalid state */ |
| [] BSSAP.receive(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
| setverdict(fail); |
| self.stop; |
| } |
| |
| |
| [] BSSAP.receive(PDU_BSSAP:?) -> value bssap { |
| log("Received unhandled SCCP-CO: ", bssap); |
| } |
| } |
| } |
| } |
| |
| } |