| module BSC_ConnectionHandler { |
| |
| import from General_Types all; |
| import from Osmocom_Types all; |
| import from Native_Functions all; |
| import from GSM_Types all; |
| import from IPL4asp_Types all; |
| import from SCCPasp_Types all; |
| import from BSSAP_Types all; |
| import from BSSMAP_Emulation all; |
| import from BSSMAP_Templates all; |
| |
| import from GSUP_Types all; |
| import from GSUP_Emulation all; |
| |
| import from MNCC_Types all; |
| import from MNCC_Emulation all; |
| |
| import from MGCP_Types all; |
| import from MGCP_Emulation all; |
| import from MGCP_Templates all; |
| import from SDP_Types all; |
| |
| import from MobileL3_Types all; |
| import from MobileL3_CommonIE_Types all; |
| import from MobileL3_MM_Types all; |
| import from MobileL3_CC_Types all; |
| import from L3_Templates all; |
| |
| /* this component represents a single subscriber connection */ |
| type component BSC_ConnHdlr extends BSSAP_ConnHdlr, MNCC_ConnHdlr, GSUP_ConnHdlr, MGCP_ConnHdlr { |
| var BSC_ConnHdlrPars g_pars; |
| } |
| |
| type record AuthVector { |
| OCT16 rand, |
| OCT4 sres, |
| OCT8 kc |
| /* FIXME: 3G elements */ |
| } |
| |
| type record BSC_ConnHdlrPars { |
| SCCP_PAR_Address sccp_addr_own, |
| SCCP_PAR_Address sccp_addr_peer, |
| BSSMAP_IE_CellIdentifier cell_id, |
| hexstring imei, |
| hexstring imsi, |
| hexstring msisdn, |
| OCT4 tmsi optional, |
| BSSMAP_IE_ClassmarkInformationType2 cm2, |
| BSSMAP_IE_ClassmarkInformationType3 cm3 optional, |
| AuthVector vec optional |
| }; |
| |
| |
| /* Callback function from general BSSMAP_Emulation whenever a connectionless |
| * BSSMAP message arrives. Canreturn a PDU_BSSAPthat should be sent in return */ |
| private function BscUnitdataCallback(PDU_BSSAP bssap) |
| runs on BSSMAP_Emulation_CT return template PDU_BSSAP { |
| var template PDU_BSSAP resp := omit; |
| |
| log("BSSMAP_BscUnitdataCallback"); |
| /* answer all RESET with RESET ACK */ |
| if (match(bssap, tr_BSSMAP_Reset)){ |
| log("BSSMAP_BscUnitdataCallback: Responding to RESET with RESET-ACK"); |
| resp := ts_BSSMAP_ResetAck; |
| } |
| |
| /* FIXME: Handle paging, etc. */ |
| return resp; |
| } |
| |
| const BssmapOps BSC_BssmapOps := { |
| /* Create call-back for inbound connections from MSC (hand-over) */ |
| create_cb := refers(BSSMAP_Emulation.ExpectedCreateCallback), |
| unitdata_cb := refers(BscUnitdataCallback), |
| decode_dtap := true, |
| role_ms := true |
| } |
| |
| |
| private function MnccUnitdataCallback(MNCC_PDU mncc) |
| runs on MNCC_Emulation_CT return template MNCC_PDU { |
| log("Ignoring MNCC", mncc); |
| return omit; |
| } |
| |
| const MnccOps BCC_MnccOps := { |
| create_cb := refers(MNCC_Emulation.ExpectedCreateCallback), |
| unitdata_cb := refers(MnccUnitdataCallback) |
| } |
| |
| |
| |
| template BSSAP_Conn_Req ts_BSSAP_Conn_Req(SCCP_PAR_Address peer, SCCP_PAR_Address own, PDU_BSSAP bssap) := { |
| addr_peer := peer, |
| addr_own := own, |
| bssap := bssap |
| }; |
| |
| /* Encode 'l3' and ask BSSMAP_Emulation to create new connection with COMPL L3 INFO */ |
| function f_bssap_compl_l3(PDU_ML3_MS_NW l3) |
| runs on BSC_ConnHdlr { |
| log("Sending COMPL L3: ", l3); |
| var octetstring l3_enc := enc_PDU_ML3_MS_NW(l3); |
| BSSAP.send(ts_BSSAP_Conn_Req(g_pars.sccp_addr_peer, g_pars.sccp_addr_own, |
| valueof(ts_BSSMAP_ComplL3(g_pars.cell_id, l3_enc)))); |
| alt { |
| [] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_CONF_IND) {} |
| [] BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND) { |
| setverdict(fail, "DISC.ind from SCCP"); |
| self.stop; |
| } |
| } |
| } |
| |
| /* helper function to fully establish a dedicated channel */ |
| function f_establish_fully(MobileIdentityLV mi, boolean expect_auth, boolean expect_ciph) |
| runs on BSC_ConnHdlr { |
| var PDU_ML3_MS_NW l3_info := valueof(ts_CM_SERV_REQ(CM_TYPE_MO_CALL, mi)); |
| var PDU_DTAP_MT dtap_mt; |
| |
| /* Send BSSAP_Conn_Req with COMPL L3 INFO to MSC */ |
| f_bssap_compl_l3(l3_info); |
| |
| f_mm_common(expect_auth, expect_ciph); |
| if (expect_ciph) { |
| /* implicit CM SERVICE ACCEPT? */ |
| } else { |
| /* explicit CM SERVICE ACCEPT */ |
| BSSAP.receive(tr_PDU_DTAP_MT(tr_CM_SERV_ACC)); |
| } |
| } |
| |
| /* helper function to fully establish a dedicated channel */ |
| function f_establish_fully_pag(MobileIdentityLV mi, boolean expect_auth, boolean expect_ciph) |
| runs on BSC_ConnHdlr { |
| var PDU_ML3_MS_NW l3_info := valueof(ts_PAG_RESP(mi)); |
| var PDU_DTAP_MT dtap_mt; |
| |
| /* Send BSSAP_Conn_Req with COMPL L3 INFO to MSC */ |
| f_bssap_compl_l3(l3_info); |
| |
| f_mm_common(expect_auth, expect_ciph); |
| } |
| |
| |
| /* build a PDU_ML3_MS_NW containing a Location Update by IMSI */ |
| function f_build_lu_imsi(hexstring imsi) return PDU_ML3_MS_NW |
| { |
| var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi)); |
| return f_build_lu(mi); |
| } |
| function f_build_lu_imei(hexstring imei) return PDU_ML3_MS_NW |
| { |
| var MobileIdentityLV mi := valueof(ts_MI_IMEI_LV(imei)); |
| return f_build_lu(mi); |
| } |
| function f_build_lu_tmsi(OCT4 tmsi) return PDU_ML3_MS_NW |
| { |
| var MobileIdentityLV mi := valueof(ts_MI_TMSI_LV(tmsi)); |
| return f_build_lu(mi); |
| } |
| private function f_build_lu(MobileIdentityLV mi) return PDU_ML3_MS_NW |
| { |
| var LocationAreaIdentification_V old_lai := { '62F220'O, '9999'O }; |
| var PDU_ML3_MS_NW l3_info := valueof(ts_ML3_MO_LU_Req(valueof(ts_ML3_IE_LuType_Attach), |
| old_lai, mi, valueof(ts_CM1))); |
| return l3_info; |
| } |
| |
| private function f_rnd_oct(integer len) return octetstring { |
| var integer i; |
| var octetstring res; |
| for (i := 0; i < len; i := i + 1) { |
| res[i] := int2oct(float2int(rnd()*256.0), 1); |
| } |
| return res; |
| } |
| |
| function f_gen_auth_vec_2g() return AuthVector { |
| var AuthVector vec; |
| vec.rand := f_rnd_oct(16); |
| vec.sres := f_rnd_oct(4); |
| vec.kc := f_rnd_oct(8); |
| return vec; |
| } |
| |
| |
| function f_mm_common(boolean expect_auth, boolean expect_ciph) runs on BSC_ConnHdlr |
| { |
| if (expect_auth) { |
| g_pars.vec := f_gen_auth_vec_2g(); |
| var GSUP_IE auth_tuple := valueof(ts_GSUP_IE_AuthTuple2G(g_pars.vec.rand, |
| g_pars.vec.sres, |
| g_pars.vec.kc)); |
| GSUP.receive(tr_GSUP_SAI_REQ(g_pars.imsi)); |
| GSUP.send(ts_GSUP_SAI_RES(g_pars.imsi, auth_tuple)); |
| |
| BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_MM_AUTH_REQ(g_pars.vec.rand))); |
| BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MT_MM_AUTH_RESP_2G(g_pars.vec.sres))); |
| } |
| |
| if (expect_ciph) { |
| BSSAP.receive(tr_BSSMAP_CipherModeCmd(?, g_pars.vec.kc)); |
| BSSAP.send(ts_BSSMAP_CipherModeCompl('02'O)); |
| } |
| } |
| |
| function f_perform_lu(boolean expect_auth, boolean expect_tmsi, boolean send_early_cm, |
| boolean expect_ciph := false) |
| runs on BSC_ConnHdlr { |
| var PDU_ML3_MS_NW l3_lu := f_build_lu_imsi(g_pars.imsi) |
| var PDU_DTAP_MT dtap_mt; |
| |
| /* tell GSUP dispatcher to send this IMSI to us */ |
| f_create_gsup_expect(hex2str(g_pars.imsi)); |
| |
| /* Send BSSAP_Conn_Req with COMPL L3 INFO to MSC */ |
| f_bssap_compl_l3(l3_lu); |
| |
| if (send_early_cm) { |
| BSSAP.send(ts_BSSMAP_ClassmarkUpd(g_pars.cm2, g_pars.cm3)); |
| } |
| |
| f_mm_common(expect_auth, expect_ciph); |
| |
| /* Expect MSC to perform LU with HLR */ |
| GSUP.receive(tr_GSUP_UL_REQ(g_pars.imsi)); |
| GSUP.send(ts_GSUP_ISD_REQ(g_pars.imsi, g_pars.msisdn)); |
| GSUP.receive(tr_GSUP_ISD_RES(g_pars.imsi)); |
| GSUP.send(ts_GSUP_UL_RES(g_pars.imsi)); |
| |
| alt { |
| [] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Acc)) -> value dtap_mt { |
| var PDU_ML3_LocationUpdateAccept lu_acc := dtap_mt.dtap.msgs.mm.locationUpdateAccept; |
| if (expect_tmsi) { |
| if (not ispresent(lu_acc.mobileIdentityTLV) or |
| not ischosen(lu_acc.mobileIdentityTLV.mobileIdentityLV.mobileIdentityV.oddEvenInd_identity.tmsi_ptmsi)) { |
| setverdict(fail, "Expected TMSI but no TMSI was allocated"); |
| self.stop; |
| } else { |
| g_pars.tmsi := lu_acc.mobileIdentityTLV.mobileIdentityLV.mobileIdentityV.oddEvenInd_identity.tmsi_ptmsi.octets; |
| BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MO_TmsiRealloc_Cmpl)); |
| } |
| } else { |
| if (ispresent(lu_acc.mobileIdentityTLV) and |
| ischosen(lu_acc.mobileIdentityTLV.mobileIdentityLV.mobileIdentityV.oddEvenInd_identity.tmsi_ptmsi)) { |
| setverdict(fail, "Expected no TMSI but TMSI was allocated"); |
| self.stop; |
| } |
| } |
| } |
| [] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_LU_Rej)) { |
| setverdict(fail, "Expected LU ACK, but received LU REJ"); |
| self.stop; |
| } |
| } |
| /* FIXME: there could be pending SMS or other common procedures by the MSC, let's ignore them */ |
| BSSAP.receive(tr_BSSMAP_ClearCommand); |
| BSSAP.send(ts_BSSMAP_ClearComplete); |
| BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND); |
| setverdict(pass); |
| } |
| |
| function f_foo() runs on BSC_ConnHdlr{ |
| /* SCCP CC handled by BSSMAP_Emulation_CT.main() */ |
| /* Expect auth, if enabled */ |
| |
| /* TODO: ISD */ |
| /* Expect encr, if enabled */ |
| /* Expect encr, if enabled */ |
| /* Expect ASS CMD, if chan_type != requested */ |
| /* Send ASS CMPL in successful case */ |
| |
| /* Expect AoIP port/ip information for RTP stream */ |
| /* Expect MSC-originated MGCP to our simulated MGW */ |
| /* Verify Counters via CTRL */ |
| /* re-configure MSC behaviour via VTY */ |
| } |
| |
| /* parameters related to a (MO?) voice call */ |
| type record CallParameters { |
| boolean expect_auth, /* do we expect AUTHENTICATE from network */ |
| boolean expect_ciph, /* do we expect CIPHER MODE from network */ |
| |
| /* CC related parameters */ |
| hexstring called_party, /* whom are we calling */ |
| integer transaction_id optional, /* which TS 04.08 CC transaction ID to use */ |
| BearerCapability_TLV bearer_cap, /* which bearer capabilities to claim */ |
| |
| /* MNCC related parameters */ |
| uint32_t mncc_callref optional, /* call reference on the MNCC side */ |
| MNCC_bearer_cap mncc_bearer_cap optional, /* MNCC-side bearer capabilities */ |
| |
| /* RTP related parameters */ |
| HostName bss_rtp_ip optional, /* BSS Side RTP IP */ |
| PortNumber bss_rtp_port optional, /* BSS Side RTP Port */ |
| HostName mss_rtp_ip optional, /* MSS Side RTP IP */ |
| PortNumber mss_rtp_port optional, /* MSS Side RTP Port */ |
| HostName mgw_rtp_ip_bss, /* BSS-facing MGW RTP IP */ |
| PortNumber mgw_rtp_port_bss, /* BSS-facing MGW RTP Port */ |
| HostName mgw_rtp_ip_mss, /* MSS-facing MGW RTP IP */ |
| PortNumber mgw_rtp_port_mss, /* MSS-facing MGW RTP Port */ |
| uint7_t rtp_payload_type, /* dynamic RTP payload type */ |
| charstring rtp_sdp_format, /* AMR/8000 or the like */ |
| |
| MgcpCallId mgcp_call_id optional, /* MGCP Call ID; CallAgent allocated */ |
| MgcpEndpoint mgcp_ep optional /* MGCP Endpoint, CallAgent or MGW allocated */, |
| MgcpConnectionId mgcp_connection_id_bss, /* MGCP Connection ID BSS Side */ |
| MgcpConnectionId mgcp_connection_id_mss /* MGCP Connection ID MSS Side */ |
| } |
| |
| template (value) CallParameters t_CallParams(hexstring called, integer tid) := { |
| expect_auth := false, |
| expect_ciph := false, |
| called_party := called, |
| transaction_id := tid, |
| bearer_cap := valueof(ts_Bcap_voice), |
| mncc_callref := omit, |
| mncc_bearer_cap := valueof(ts_MNCC_bcap_voice), |
| bss_rtp_ip := "9.8.7.6", |
| bss_rtp_port := 9000, |
| mss_rtp_ip := omit, |
| mss_rtp_port := omit, |
| mgw_rtp_ip_bss := "1.1.1.1", |
| mgw_rtp_port_bss := 10000, |
| mgw_rtp_ip_mss := "1.1.1.1", |
| mgw_rtp_port_mss := 11000, |
| rtp_payload_type := 98, |
| rtp_sdp_format := "AMR/8000", |
| mgcp_call_id := omit, |
| mgcp_ep := omit, |
| mgcp_connection_id_bss := '0'H,// |
| mgcp_connection_id_mss := '0'H // |
| }; |
| |
| |
| function f_mo_call(inout CallParameters cpars) |
| runs on BSC_ConnHdlr { |
| |
| var MobileIdentityLV mi; |
| var MNCC_PDU mncc; |
| var MgcpCommand mgcp_cmd; |
| |
| /* If we have a TMSI, use TMSI instead of IMSI */ |
| if (ispresent(g_pars.tmsi)) { |
| mi := valueof(ts_MI_TMSI_LV(g_pars.tmsi)); |
| } else { |
| mi := valueof(ts_MI_IMSI_LV(g_pars.imsi)); |
| } |
| f_establish_fully(mi, cpars.expect_auth, cpars.expect_ciph); |
| |
| /* Create MNCC and MGCP expect */ |
| f_create_mncc_expect(hex2str(cpars.called_party)); |
| f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit}); |
| |
| BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MO_CC_SETUP(cpars.transaction_id, cpars.called_party))); |
| interleave { |
| [] MNCC.receive(tr_MNCC_SETUP_ind(?, tr_MNCC_number(hex2str(cpars.called_party)))) -> value mncc { |
| cpars.mncc_callref := mncc.u.signal.callref; |
| /* Call Proceeding */ |
| MNCC.send(ts_MNCC_CALL_PROC_req(cpars.mncc_callref, cpars.mncc_bearer_cap)); |
| BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_CALL_PROC(cpars.transaction_id))); |
| }; |
| /* First MGCP CRCX (for BSS/RAN side) */ |
| [] MGCP.receive(tr_CRCX) -> value mgcp_cmd { |
| cpars.mgcp_call_id := f_MgcpCmd_extract_call_id(mgcp_cmd); |
| /* TODO: dynamic EP allocation case */ |
| cpars.mgcp_ep := mgcp_cmd.line.ep; |
| var SDP_Message sdp := valueof(ts_SDP(cpars.mgw_rtp_ip_bss, cpars.mgw_rtp_ip_bss, |
| hex2str(cpars.mgcp_call_id), "42", |
| cpars.mgw_rtp_port_bss, |
| { int2str(cpars.rtp_payload_type) }, |
| { valueof(ts_SDP_rtpmap(cpars.rtp_payload_type, |
| cpars.rtp_sdp_format)), |
| valueof(ts_SDP_ptime(20)) })); |
| MGCP.send(ts_CRCX_ACK(mgcp_cmd.line.trans_id, cpars.mgcp_connection_id_bss, sdp)); |
| } |
| } |
| /* Second MGCP CRCX (this time for MSS/CN side) */ |
| MGCP.receive(tr_CRCX(cpars.mgcp_ep)) -> value mgcp_cmd { |
| var SDP_Message sdp := valueof(ts_SDP(cpars.mgw_rtp_ip_mss, cpars.mgw_rtp_ip_mss, |
| hex2str(cpars.mgcp_call_id), "42", |
| cpars.mgw_rtp_port_mss, |
| { int2str(cpars.rtp_payload_type) }, |
| { valueof(ts_SDP_rtpmap(cpars.rtp_payload_type, |
| cpars.rtp_sdp_format)), |
| valueof(ts_SDP_ptime(20)) })); |
| MGCP.send(ts_CRCX_ACK(mgcp_cmd.line.trans_id, cpars.mgcp_connection_id_mss, sdp)); |
| } |
| |
| /* Alerting */ |
| MNCC.send(ts_MNCC_ALERT_req(cpars.mncc_callref)); |
| |
| var BSSMAP_IE_AoIP_TransportLayerAddress tla_ass := |
| valueof(ts_BSSMAP_IE_AoIP_TLA4(f_inet_addr(cpars.mgw_rtp_ip_bss),cpars.mgw_rtp_port_bss)); |
| interleave { |
| [] BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_ALERTING(cpars.transaction_id))) {} |
| /* expect AoIP IP/Port to match what we returned in CRCX_ACK above */ |
| [] BSSAP.receive(tr_BSSMAP_AssignmentReq(omit, tla_ass)) { |
| var BSSMAP_IE_AoIP_TransportLayerAddress tla; |
| tla := valueof(ts_BSSMAP_IE_AoIP_TLA4(f_inet_addr(cpars.bss_rtp_ip), cpars.bss_rtp_port)); |
| BSSAP.send(ts_BSSMAP_AssignmentComplete(omit, tla)); |
| } |
| } |
| |
| /* Answer. MNCC_SETUP_RSP -> CONNECT to MS; CONNECT_ACK from MS */ |
| MNCC.send(ts_MNCC_SETUP_rsp(cpars.mncc_callref)); |
| BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_CONNECT(cpars.transaction_id))); |
| BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MO_CC_CONNECT_ACK(cpars.transaction_id))); |
| |
| f_sleep(3.0); |
| |
| /* Hangup by "B" side */ |
| MNCC.send(ts_MNCC_DISC_req(cpars.mncc_callref, valueof(ts_MNCC_cause(23)))); |
| BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_DISC(cpars.transaction_id))); |
| |
| /* Release of call */ |
| MNCC.send(ts_MNCC_REL_req(cpars.mncc_callref, valueof(ts_MNCC_cause(42)))); |
| BSSAP.receive(tr_PDU_DTAP_MT(tr_ML3_MT_CC_RELEASE(cpars.transaction_id))); |
| BSSAP.send(ts_PDU_DTAP_MO(ts_ML3_MO_CC_REL_COMPL(cpars.transaction_id))); |
| |
| /* clearing of radio channel */ |
| interleave { |
| [] BSSAP.receive(tr_BSSMAP_ClearCommand) { |
| BSSAP.send(ts_BSSMAP_ClearComplete); |
| BSSAP.receive(BSSAP_Conn_Prim:MSC_CONN_PRIM_DISC_IND); |
| } |
| [] MGCP.receive(tr_DLCX(?)) -> value mgcp_cmd { |
| /* TODO: For one or all connections on EP? */ |
| MGCP.send(ts_DLCX_ACK2(mgcp_cmd.line.trans_id)); |
| f_create_mgcp_delete_ep(cpars.mgcp_ep); |
| } |
| } |
| setverdict(pass); |
| } |
| |
| |
| |
| |
| } |
| |
| |