Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 1 | module MSC_ConnectionHandler { |
| 2 | |
| 3 | import from General_Types all; |
| 4 | import from Osmocom_Types all; |
| 5 | import from SCCPasp_Types all; |
| 6 | import from BSSAP_Types all; |
| 7 | import from BSSMAP_Emulation all; |
| 8 | import from BSSMAP_Templates all; |
| 9 | |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 10 | import from MGCP_Types all; |
| 11 | import from MGCP_Templates all; |
| 12 | import from SDP_Types all; |
| 13 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 14 | /* this component represents a single subscriber connection at the MSC. |
| 15 | * There is a 1:1 mapping between SCCP connections and BSSAP_ConnHdlr components. |
| 16 | * We inherit all component variables, ports, functions, ... from BSSAP_ConnHdlr */ |
| 17 | type component MSC_ConnHdlr extends BSSAP_ConnHdlr { |
| 18 | /* E1 timeslot that is allocated to this component/connection */ |
| 19 | var uint5_t g_e1_timeslot; |
| 20 | /* SCCP Connecction Identifier for the underlying SCCP connection */ |
| 21 | var integer g_sccp_conn_id; |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 22 | |
| 23 | var MSC_State g_state := MSC_STATE_NONE; |
| 24 | var MgcpEndpoint g_ep_name; |
| 25 | var MgcpCallId g_call_id; |
| 26 | var MgcpConnectionId g_mgcp_conn_id; |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 27 | } |
| 28 | |
| 29 | /* Callback function from general BSSMAP_Emulation whenever a new incoming |
| 30 | * SCCP connection arrivces. Must create + start a new component */ |
| 31 | private function CreateCallback(ASP_SCCP_N_CONNECT_ind conn_ind) |
| 32 | runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr { |
| 33 | var MSC_ConnHdlr vc_conn; |
| 34 | /* Create a new BSSAP_ConnHdlr component */ |
| 35 | vc_conn := MSC_ConnHdlr.create; |
| 36 | /* connect it to the port */ |
| 37 | connect(vc_conn:BSSAP, self:CLIENT); |
| 38 | /* start it */ |
| 39 | vc_conn.start(MSC_ConnectionHandler.main(conn_ind.connectionId, conn_ind.connectionId)); |
| 40 | return vc_conn; |
| 41 | } |
| 42 | |
| 43 | /* Callback function from general BSSMAP_Emulation whenever a connectionless |
| 44 | * BSSMAP message arrives. Can retunr a PDU_BSSAP that should be sent in return */ |
| 45 | private function UnitdataCallback(PDU_BSSAP bssap) |
| 46 | runs on BSSMAP_Emulation_CT return template PDU_BSSAP { |
| 47 | var template PDU_BSSAP resp := omit; |
| 48 | |
| 49 | if (match(bssap, tr_BSSMAP_Reset)) { |
| 50 | resp := ts_BSSMAP_ResetAck; |
| 51 | } |
| 52 | |
| 53 | return resp; |
| 54 | } |
| 55 | |
| 56 | const BssmapOps MSC_BssmapOps := { |
| 57 | create_cb := refers(CreateCallback), |
| 58 | unitdata_cb := refers(UnitdataCallback) |
| 59 | } |
| 60 | |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 61 | type enumerated MSC_State { |
| 62 | MSC_STATE_NONE, |
| 63 | MSC_STATE_WAIT_ASS_COMPL, |
| 64 | MSC_STATE_WAIT_CRCX_ACK, |
| 65 | MSC_STATE_WAIT_MDCX_ACK, |
| 66 | MSC_STATE_WAIT_CLEAR_COMPL, |
| 67 | MSC_STATE_WAIT_DLCX_ACK |
| 68 | } |
| 69 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 70 | /* main function processing various incoming events */ |
| 71 | function main(integer connection_id, integer timeslot) runs on MSC_ConnHdlr { |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 72 | var MgcpResponse mgcp_rsp; |
| 73 | |
Harald Welte | b3414b2 | 2017-11-23 18:22:10 +0100 | [diff] [blame] | 74 | g_e1_timeslot := 1; /* FIXME */ |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 75 | |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 76 | g_sccp_conn_id := connection_id; |
| 77 | g_call_id := f_mgcp_alloc_call_id(); |
| 78 | g_ep_name := hex2str(int2hex(g_e1_timeslot, 1)) & "@mgw"; |
| 79 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 80 | while (true) { |
| 81 | var PDU_BSSAP bssap; |
| 82 | alt { |
| 83 | /* new SCCP-level connection indication from BSC */ |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 84 | [g_state == MSC_STATE_NONE] BSSAP.receive(tr_BSSMAP_ComplL3) -> value bssap { |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 85 | /* respond with ASSIGNMENT CMD */ |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 86 | g_state := MSC_STATE_WAIT_ASS_COMPL; |
Harald Welte | ab05d6c | 2017-11-23 18:50:52 +0100 | [diff] [blame] | 87 | BSSAP.send(ts_BSSMAP_AssignmentReq(0, g_e1_timeslot)); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 88 | } |
| 89 | [g_state == MSC_STATE_WAIT_ASS_COMPL] BSSAP.receive(tr_BSSMAP_AssignmentComplete) { |
| 90 | /* FIXME: Send MGCP CRCX */ |
| 91 | g_state := MSC_STATE_WAIT_CRCX_ACK; |
| 92 | var MgcpTransId trans_id := f_mgcp_alloc_tid(); |
| 93 | //template SDP_Message sdp := omit; |
| 94 | BSSAP.send(ts_CRCX(trans_id, g_ep_name, "recvonly", g_call_id)); //, sdp)); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 95 | } |
| 96 | /* |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 97 | [] BSSAP.receive(tr_BSSMAP_AssignmentFail) { |
| 98 | } |
| 99 | */ |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 100 | |
| 101 | /* receive CRCX ACK: transmit MDCX */ |
| 102 | [g_state == MSC_STATE_WAIT_CRCX_ACK] BSSAP.receive(tr_CRCX_ACK) -> value mgcp_rsp { |
| 103 | /* extract connection ID */ |
Harald Welte | 4c11d56 | 2017-11-24 23:39:00 +0100 | [diff] [blame^] | 104 | g_mgcp_conn_id := f_MgcpResp_extract_conn_id(mgcp_rsp); |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 105 | g_state := MSC_STATE_WAIT_MDCX_ACK; |
| 106 | var MgcpTransId trans_id := f_mgcp_alloc_tid(); |
| 107 | BSSAP.send(ts_MDCX(trans_id, g_ep_name, "sendrecv", g_call_id, g_mgcp_conn_id)); |
| 108 | } |
| 109 | |
| 110 | /* receive MDCX ACK: wait + transmit CLEAR COMMAND */ |
| 111 | [g_state == MSC_STATE_WAIT_MDCX_ACK] BSSAP.receive(tr_CRCX_ACK) -> value mgcp_rsp { |
| 112 | g_state := MSC_STATE_WAIT_CLEAR_COMPL |
| 113 | BSSAP.send(ts_BSSMAP_ClearCommand(0)); |
| 114 | } |
| 115 | |
| 116 | /* CLEAR COMPLETE from BSS (response to CLEAR COMMAND) */ |
| 117 | [g_state == MSC_STATE_WAIT_CLEAR_COMPL] BSSAP.receive(ts_BSSMAP_ClearComplete) { |
| 118 | /* send DLCX */ |
| 119 | g_state := MSC_STATE_WAIT_DLCX_ACK; |
| 120 | var MgcpTransId trans_id := f_mgcp_alloc_tid(); |
| 121 | BSSAP.send(ts_DLCX(trans_id, g_ep_name, g_call_id)); |
| 122 | } |
| 123 | |
| 124 | [g_state == MSC_STATE_WAIT_DLCX_ACK] BSSAP.receive(tr_DLCX_ACK) { |
| 125 | setverdict(pass); |
| 126 | self.stop; |
| 127 | } |
| 128 | |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 129 | /* TODO: CLEAR REQUEST from BSS */ |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 130 | |
| 131 | [] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
Harald Welte | c82eef4 | 2017-11-24 20:40:12 +0100 | [diff] [blame] | 132 | setverdict(fail); |
Harald Welte | 365f4ed | 2017-11-23 00:00:43 +0100 | [diff] [blame] | 133 | self.stop; |
| 134 | } |
| 135 | |
| 136 | [] BSSAP.receive(PDU_BSSAP:?) -> value bssap { |
| 137 | log("Received unhandled SCCP-CO: ", bssap); |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | } |