| module BSSGP_Emulation { |
| |
| import from General_Types all; |
| import from Osmocom_Types all; |
| import from NS_Types all; |
| import from NS_Emulation all; |
| import from BSSGP_Types all; |
| import from Osmocom_Gb_Types all; |
| import from IPL4asp_Types all; |
| |
| import from MobileL3_GMM_SM_Types all; |
| import from MobileL3_Types all; |
| |
| import from LLC_Types all; |
| import from LLC_Templates all; |
| |
| import from SNDCP_Types all; |
| |
| /*********************************************************************** |
| * Communication between Client Components and Main Component |
| ***********************************************************************/ |
| |
| type record BssgpStatusIndication { |
| Nsei nsei, |
| BssgpBvci bvci, |
| BvcState state |
| } |
| |
| template BssgpStatusIndication t_BssgpStsInd(template Nsei nsei, template BssgpBvci bvci, template BvcState state) := { |
| nsei := nsei, |
| bvci := bvci, |
| state := state |
| } |
| |
| type enumerated BvcState { |
| BVC_S_BLOCKED, |
| BVC_S_UNBLOCKED |
| }; |
| |
| /* port from our (internal) point of view */ |
| type port BSSGP_SP_PT message { |
| in PDU_BSSGP, |
| PDU_LLC, |
| PDU_L3_MS_SGSN, |
| PDU_L3_SGSN_MS; |
| out BssgpDecoded, |
| NsStatusIndication, |
| BssgpStatusIndication, |
| ASP_Event, |
| PDU_L3_MS_SGSN, |
| PDU_L3_SGSN_MS; |
| } with { extension "internal" }; |
| |
| /* port from the user point of view */ |
| type port BSSGP_PT message { |
| in ASP_Event, |
| NsStatusIndication, |
| BssgpStatusIndication, |
| BssgpDecoded, |
| PDU_L3_MS_SGSN, |
| PDU_L3_SGSN_MS; |
| out PDU_BSSGP, |
| PDU_LLC, |
| PDU_L3_SGSN_MS, |
| PDU_L3_MS_SGSN; |
| } with { extension "internal" }; |
| |
| signature BSSGP_register_client(hexstring imsi, OCT4 tlli, BssgpCellId cell_id); |
| signature BSSGP_unregister_client(hexstring imsi); |
| signature BSSGP_llgmm_assign(OCT4 tlli_old, OCT4 tlli); |
| |
| type port BSSGP_PROC_PT procedure { |
| inout BSSGP_register_client, BSSGP_unregister_client, BSSGP_llgmm_assign; |
| } with { extension "internal" }; |
| |
| |
| /*********************************************************************** |
| * Client Component for a single MS/TLLI |
| ***********************************************************************/ |
| |
| type component BSSGP_Client_CT { |
| port BSSGP_PT BSSGP[3]; |
| port BSSGP_PT BSSGP_SIG[3]; |
| port BSSGP_PROC_PT BSSGP_PROC[3]; |
| }; |
| |
| /*********************************************************************** |
| * Main Component |
| ***********************************************************************/ |
| |
| function BssgpStart(BssgpConfig cfg) runs on BSSGP_CT { |
| g_cfg := cfg; |
| f_init(); |
| f_ScanEvents(); |
| } |
| |
| private function f_init() runs on BSSGP_CT { |
| /* Connect the UDP socket */ |
| f_change_state(BVC_S_BLOCKED); |
| } |
| |
| type component BSSGP_CT { |
| /* UDP ports towards the bottom (IUT) */ |
| port NS_PT BSCP; |
| /* NS-User SAP towards the user */ |
| port BSSGP_SP_PT BSSGP_SP; |
| port BSSGP_SP_PT BSSGP_SP_SIG; |
| port BSSGP_PROC_PT BSSGP_PROC; |
| |
| var BssgpConfig g_cfg; |
| |
| var BvcState g_ptp_bvc_state := BVC_S_BLOCKED; |
| timer g_T1 := 15.0; |
| timer g_T2 := 60.0; |
| |
| var ClientEntity ClientTable[16]; |
| } |
| |
| type record length(16) of LLC_Entity LLC_Entities; |
| |
| type record ClientEntity { |
| OCT4 tlli, |
| OCT4 tlli_old optional, |
| hexstring imsi, |
| BssgpCellId cell_id, |
| BSSGP_Client_CT comp_ref, |
| /* LLC entities, one for each SAPI */ |
| LLC_Entity llc[16] |
| }; |
| |
| type record LLC_Entity { |
| boolean sgsn_role, |
| /* N(U) on transmit side for next PDU */ |
| uint9_t n_u_tx_next, |
| /* N(U) on receive side, last PDU */ |
| uint9_t n_u_rx_last optional |
| }; |
| |
| function f_llc_create(boolean sgsn_role := false) return LLC_Entities { |
| var LLC_Entities llc; |
| for (var integer i := 0; i < 16; i := i+1) { |
| llc[i] := valueof(t_LLC_init(sgsn_role)); |
| } |
| return llc; |
| } |
| |
| private template LLC_Entity t_LLC_init(boolean sgsn_role := false) := { |
| sgsn_role := sgsn_role, |
| n_u_tx_next := 0, |
| n_u_rx_last := - |
| } |
| |
| type record BssgpConfig { |
| Nsvci nsei, |
| Nsvci bvci, |
| BssgpCellId cell_id, |
| boolean sgsn_role |
| }; |
| |
| function f_BnsUdReq(template PDU_BSSGP pdu, BssgpBvci bvci) |
| runs on BSSGP_CT return NsUnitdataRequest { |
| var NsUnitdataRequest udr := { |
| bvci := bvci, |
| nsei := g_cfg.nsei, |
| /* for some weird reason we get "Dynamic test case error: Text encoder: Encoding an |
| * unbound integer value." when trying to send the reocrd rather than the octetstring */ |
| //sdu := omit, |
| //bssgp := valueof(pdu) |
| sdu := enc_PDU_BSSGP(valueof(pdu)), |
| bssgp := omit |
| } |
| return udr; |
| } |
| |
| function f_BnsUdInd(template PDU_BSSGP pdu, template BssgpBvci bvci) |
| runs on BSSGP_CT return template NsUnitdataIndication { |
| var template NsUnitdataIndication udi := { |
| bvci := bvci, |
| nsei := g_cfg.nsei, |
| sdu := *, |
| bssgp := pdu |
| } |
| return udi; |
| } |
| |
| private function f_change_state(BvcState new_state) runs on BSSGP_CT { |
| log("BSSGP State Transition: ", g_ptp_bvc_state, " -> ", new_state); |
| g_ptp_bvc_state := new_state; |
| for (var integer i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isbound(ClientTable[i].comp_ref)) { |
| BSSGP_SP.send(t_BssgpStsInd(g_cfg.nsei, g_cfg.bvci, g_ptp_bvc_state)) to ClientTable[i].comp_ref; |
| } |
| } |
| } |
| |
| private function f_sendReset() runs on BSSGP_CT { |
| var PDU_BSSGP pdu := valueof(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, g_cfg.bvci, g_cfg.cell_id)); |
| log("PDU: ", pdu); |
| log("ENC: ", enc_PDU_BSSGP(pdu)); |
| |
| /* BVC-RESET is always sent via the SIGNALLING BVCI, see Table 5.4.1 */ |
| BSCP.send(f_BnsUdReq(pdu, 0)); |
| g_T2.start; |
| //f_change_state(BVC_S_WAIT_RESET); |
| } |
| |
| private function f_sendUnblock() runs on BSSGP_CT { |
| BSCP.send(f_BnsUdReq(t_BVC_UNBLOCK(g_cfg.bvci), 0)); |
| g_T1.start; |
| } |
| |
| private function f_sendBlock(BssgpCause cause) runs on BSSGP_CT { |
| BSCP.send(f_BnsUdReq(t_BVC_BLOCK(g_cfg.bvci, cause), 0)); |
| g_T1.start; |
| } |
| |
| private function f_sendStatus(BssgpCause cause, PDU_BSSGP pdu) runs on BSSGP_CT { |
| /* FIXME: Make sure correct Signaling or PTP BVCI is used! */ |
| BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(g_cfg.bvci, cause, pdu), g_cfg.bvci)); |
| } |
| |
| /* attempt to extract the TLLI from a BSSGP PDU */ |
| function f_bssgp_get_tlli(PDU_BSSGP bssgp) return template OCT4 { |
| if (ischosen(bssgp.pDU_BSSGP_DL_UNITDATA)) { |
| return bssgp.pDU_BSSGP_DL_UNITDATA.tLLI_current; |
| } else if (ischosen(bssgp.pDU_BSSGP_UL_UNITDATA)) { |
| return bssgp.pDU_BSSGP_UL_UNITDATA.tLLI; |
| } else if (ischosen(bssgp.pDU_BSSGP_RA_CAPABILITY)) { |
| return bssgp.pDU_BSSGP_RA_CAPABILITY.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_RA_CAPABILITY_UPDATE)) { |
| return bssgp.pDU_BSSGP_RA_CAPABILITY_UPDATE.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_RA_CAPABILITY_UPDATE_ACK)) { |
| return bssgp.pDU_BSSGP_RA_CAPABILITY_UPDATE_ACK.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_RADIO_STATUS)) { |
| return bssgp.pDU_BSSGP_RADIO_STATUS.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_SUSPEND)) { |
| return bssgp.pDU_BSSGP_SUSPEND.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_SUSPEND_ACK)) { |
| return bssgp.pDU_BSSGP_SUSPEND_ACK.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_SUSPEND_NACK)) { |
| return bssgp.pDU_BSSGP_SUSPEND_NACK.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_RESUME)) { |
| return bssgp.pDU_BSSGP_RESUME.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_RESUME_ACK)) { |
| return bssgp.pDU_BSSGP_RESUME_ACK.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_RESUME_NACK)) { |
| return bssgp.pDU_BSSGP_RESUME_NACK.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_FLUSH_LL)) { |
| return bssgp.pDU_BSSGP_FLUSH_LL.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_FLUSH_LL_ACK)) { |
| return bssgp.pDU_BSSGP_FLUSH_LL_ACK.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_LLC_DISCARDED)) { |
| return bssgp.pDU_BSSGP_LLC_DISCARDED.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_LLC_DISCARDED)) { |
| return bssgp.pDU_BSSGP_LLC_DISCARDED.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_PAGING_CS) and |
| isvalue(bssgp.pDU_BSSGP_PAGING_CS.tLLI)) { |
| return bssgp.pDU_BSSGP_PAGING_CS.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_FLOW_CONTROL_MS)) { |
| return bssgp.pDU_BSSGP_FLOW_CONTROL_MS.tLLI.tLLI_Value; |
| } else if (ischosen(bssgp.pDU_BSSGP_FLOW_CONTROL_MS_ACK)) { |
| return bssgp.pDU_BSSGP_FLOW_CONTROL_MS_ACK.tLLI.tLLI_Value; |
| } |
| /* TODO: Handover, PFC, LCS */ |
| return omit; |
| } |
| |
| /* |
| private function f_tbl_init() runs on BSSGP_CT { |
| var integer i; |
| for (i := 0; i < sizeof(ImsiTable); i := i+1) { |
| ImsiTable[i] := -; |
| } |
| |
| for (i := 0; i < sizeof(TlliTable); i := i+1) { |
| TlliTable[i] := -; |
| } |
| } |
| */ |
| |
| private function f_tbl_client_add(hexstring imsi, OCT4 tlli, BssgpCellId cell_id, BSSGP_Client_CT vc_conn) |
| runs on BSSGP_CT { |
| var integer i; |
| for (i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (not isvalue(ClientTable[i].comp_ref)) { |
| log("Adding Client=", vc_conn, ", IMSI=", imsi, ", TLLI=", tlli, ", index=", i); |
| ClientTable[i] := { |
| tlli := tlli, |
| tlli_old := omit, |
| imsi := imsi, |
| cell_id := cell_id, |
| comp_ref := vc_conn, |
| llc := - |
| }; |
| for (var integer j := 0; j < sizeof(ClientTable[i].llc); j := j+1) { |
| ClientTable[i].llc[j] := valueof(t_LLC_init(g_cfg.sgsn_role)); |
| } |
| return; |
| } |
| } |
| testcase.stop("Client Table full"); |
| } |
| |
| private function f_tbl_client_del(hexstring imsi, BSSGP_Client_CT vc_conn) runs on BSSGP_CT { |
| var integer i; |
| for (i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isvalue(ClientTable[i].imsi) and ClientTable[i].imsi == imsi) { |
| if (ClientTable[i].comp_ref != vc_conn) { |
| setverdict(fail, "Cannot unregister index=", i, " IMSI ", imsi, " registred to ", |
| ClientTable[i].comp_ref, " from ", vc_conn); |
| mtc.stop; |
| } |
| log("Removing Client IMSI=", imsi, ", index=", i); |
| ClientTable[i] := { |
| tlli := -, |
| tlli_old := omit, |
| imsi := ''H, |
| cell_id := -, |
| comp_ref := null, |
| llc := - }; |
| return; |
| } |
| } |
| setverdict(fail, "Could not find client for IMSI ", imsi); |
| mtc.stop; |
| } |
| |
| /* TS 44.064 7.2.1.1 LLGMM-ASSIGN */ |
| private function f_tbl_client_llgmm_assign(OCT4 tlli_old, OCT4 tlli_new, BSSGP_Client_CT vc_conn) |
| runs on BSSGP_CT { |
| var integer i := f_tbl_idx_by_comp(vc_conn); |
| |
| if (tlli_old == 'FFFFFFFF'O and tlli_new != 'FFFFFFFF'O) { |
| /* TLLI assignment */ |
| ClientTable[i].tlli := tlli_new; |
| ClientTable[i].tlli_old := omit; |
| } else if (tlli_old != 'FFFFFFFF'O and tlli_new != 'FFFFFFFF'O) { |
| /* TLLI change: both active */ |
| ClientTable[i].tlli := tlli_new; |
| ClientTable[i].tlli_old := tlli_old; |
| } else if (tlli_old != 'FFFFFFFF'O and tlli_new == 'FFFFFFFF'O) { |
| /* TLLI unassignment: old shall be unassigned; new stays */ |
| ClientTable[i].tlli_old := omit; |
| } |
| } |
| |
| private function f_tbl_comp_by_imsi(hexstring imsi) runs on BSSGP_CT return BSSGP_Client_CT { |
| var integer i; |
| for (i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isvalue(ClientTable[i].imsi) and isvalue(ClientTable[i].comp_ref) |
| and ClientTable[i].imsi == imsi) { |
| return ClientTable[i].comp_ref; |
| } |
| } |
| setverdict(fail, "Couldn't find Component for IMSI ", imsi); |
| mtc.stop; |
| } |
| |
| private function f_tbl_comp_by_tlli(OCT4 tlli) runs on BSSGP_CT return BSSGP_Client_CT { |
| var integer i; |
| for (i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isvalue(ClientTable[i].comp_ref) and |
| (isvalue(ClientTable[i].tlli) and (ClientTable[i].tlli == tlli or |
| isvalue(ClientTable[i].tlli_old) and ClientTable[i].tlli_old == tlli) )) { |
| return ClientTable[i].comp_ref; |
| } |
| } |
| setverdict(fail, "Couldn't find Component for TLLI ", tlli); |
| mtc.stop; |
| } |
| |
| private function f_tbl_idx_by_comp(BSSGP_Client_CT comp_ref) runs on BSSGP_CT return integer { |
| var integer i; |
| for (i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isvalue(ClientTable[i].comp_ref) and ClientTable[i].comp_ref == comp_ref) { |
| return i; |
| } |
| } |
| setverdict(fail, "Couldn't find Client for Component ", comp_ref); |
| mtc.stop; |
| } |
| |
| private function f_tbl_tlli_by_comp(BSSGP_Client_CT comp_ref) runs on BSSGP_CT return OCT4 { |
| var integer i; |
| for (i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isvalue(ClientTable[i].tlli) and isvalue(ClientTable[i].comp_ref) |
| and ClientTable[i].comp_ref == comp_ref) { |
| return ClientTable[i].tlli; |
| } |
| } |
| setverdict(fail, "Couldn't find TLLI for Component ", comp_ref); |
| mtc.stop; |
| } |
| |
| altstep as_allstate() runs on BSSGP_CT { |
| var BSSGP_Client_CT vc_conn; |
| var NsUnitdataIndication udi; |
| var NsStatusIndication nsi; |
| var ASP_Event evt; |
| var hexstring imsi; |
| var OCT4 tlli, tlli_old; |
| var BssgpCellId cell_id; |
| |
| /* Respond to BLOCK for wrong NSVCI */ |
| [] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK(?, ?), 0)) -> value udi { |
| log("Rx BVC-BLOCK for unknown BVCI"); |
| f_sendStatus(BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp); |
| } |
| |
| /* Respond to RESET with correct BVCI/CellID */ |
| [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, g_cfg.bvci, g_cfg.cell_id), 0)) -> value udi { |
| log("Rx BVC-RESET for Our BVCI=", g_cfg.bvci); |
| BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, g_cfg.cell_id), 0)); |
| f_change_state(BVC_S_UNBLOCKED); |
| } |
| |
| /* Respond to RESET for signalling BVCI 0 */ |
| [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, g_cfg.cell_id), 0)) -> value udi { |
| log("Rx BVC-RESET for Signaling BVCI=0"); |
| BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, g_cfg.cell_id), 0)); |
| } |
| |
| /* Respond to RESET with wrong NSEI/NSVCI */ |
| [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, ?, ?), 0)) -> value udi { |
| log("Rx BVC-RESET for unknown BVCI"); |
| f_sendStatus(BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp); |
| } |
| |
| /* default case of handling unknown PDUs */ |
| [] BSCP.receive(f_BnsUdInd(?, ?)) -> value udi { |
| log("Rx Unexpected BSSGP PDU ", udi.bssgp," in state ", g_ptp_bvc_state); |
| f_sendStatus(BSSGP_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, udi.bssgp); |
| } |
| /* Forwarding of ASP_Event and NsStatusIndication to user */ |
| [] BSCP.receive(ASP_Event:?) -> value evt { |
| for (var integer i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isbound(ClientTable[i].comp_ref)) { |
| BSSGP_SP.send(evt) to ClientTable[i].comp_ref; |
| } |
| } |
| } |
| [] BSCP.receive(NsStatusIndication:?) -> value nsi { |
| /* if we just became NS-unblocked, send a BCC-RESET */ |
| if (nsi.old_state != NSE_S_ALIVE_UNBLOCKED and nsi.new_state == NSE_S_ALIVE_UNBLOCKED) { |
| if (g_cfg.sgsn_role == false) { |
| f_sendReset(); |
| } |
| /* Idea: We could send BVC-UNBLOCK here like some SGSN do */ |
| } |
| for (var integer i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isbound(ClientTable[i].comp_ref)) { |
| BSSGP_SP.send(nsi) to ClientTable[i].comp_ref; |
| } |
| } |
| } |
| |
| [] BSSGP_PROC.getcall(BSSGP_register_client:{?,?,?}) -> param(imsi, tlli, cell_id) sender vc_conn { |
| f_tbl_client_add(imsi, tlli, cell_id, vc_conn); |
| BSSGP_PROC.reply(BSSGP_register_client:{imsi, tlli, cell_id}) to vc_conn; |
| } |
| [] BSSGP_PROC.getcall(BSSGP_unregister_client:{?}) -> param(imsi) sender vc_conn { |
| f_tbl_client_del(imsi, vc_conn); |
| BSSGP_PROC.reply(BSSGP_unregister_client:{imsi}) to vc_conn; |
| } |
| [] BSSGP_PROC.getcall(BSSGP_llgmm_assign:{?,?}) -> param(tlli_old, tlli) sender vc_conn { |
| f_tbl_client_llgmm_assign(tlli_old, tlli, vc_conn); |
| BSSGP_PROC.reply(BSSGP_llgmm_assign:{tlli_old, tlli}) to vc_conn; |
| } |
| |
| } |
| |
| altstep as_blocked() runs on BSSGP_CT { |
| [g_T1.running] g_T1.timeout { |
| f_sendUnblock(); |
| } |
| [] BSCP.receive(f_BnsUdInd(t_BVC_UNBLOCK_ACK(g_cfg.bvci), 0)) { |
| g_T1.stop; |
| f_change_state(BVC_S_UNBLOCKED); |
| } |
| [not g_cfg.sgsn_role] BSCP.receive(f_BnsUdInd(tr_BVC_RESET_ACK(g_cfg.bvci, omit), 0)) { |
| f_sendUnblock(); |
| } |
| } |
| |
| altstep as_unblocked() runs on BSSGP_CT { |
| var BSSGP_Client_CT vc_conn; |
| var NsUnitdataIndication udi; |
| var PDU_BSSGP bs_pdu; |
| var PDU_LLC llc; |
| var PDU_L3_MS_SGSN l3_mo; |
| var PDU_L3_SGSN_MS l3_mt; |
| |
| /* bogus unblock, just respond with ACK */ |
| [] BSCP.receive(f_BnsUdInd(t_BVC_UNBLOCK(g_cfg.bvci), 0)) -> value udi { |
| BSCP.send(f_BnsUdReq(t_BVC_UNBLOCK_ACK(g_cfg.bvci), 0)); |
| } |
| /* Respond to BLOCK with BLOCK-ACK + change state */ |
| [] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK(g_cfg.bvci, ?), 0)) -> value udi { |
| BSCP.send(f_BnsUdReq(t_BVC_BLOCK_ACK(g_cfg.bvci), 0)); |
| g_T1.stop; |
| f_change_state(BVC_S_BLOCKED); |
| } |
| [g_T1.running] g_T1.timeout { |
| f_sendBlock(BSSGP_CAUSE_OM_INTERVENTION); |
| } |
| [] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK_ACK(g_cfg.bvci), 0)) -> value udi { |
| g_T1.stop; |
| f_change_state(BVC_S_BLOCKED); |
| } |
| [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET_ACK(g_cfg.bvci, g_cfg.cell_id), 0)) -> value udi { |
| g_T2.stop; |
| f_change_state(BVC_S_UNBLOCKED); |
| } |
| |
| /* simply acknowledge all Flow Control Messages */ |
| [g_cfg.sgsn_role] BSCP.receive(f_BnsUdInd(tr_BVC_FC_BVC, g_cfg.bvci)) -> value udi { |
| var OCT1 tag := udi.bssgp.pDU_BSSGP_FLOW_CONTROL_BVC.tag.unstructured_Value; |
| BSCP.send(f_BnsUdReq(t_BVC_FC_BVC_ACK(tag), g_cfg.bvci)); |
| } |
| /* |
| [g_cfg.sgsn_role] BSCP.receive(f_BnsUdInd(t_BVC_FC_MS, g_cfg.bvci)) { |
| BSCP.send(f_BnsUdReq(t_BVC_FC_MS_ACK, g_cfg.bvci)); |
| } |
| */ |
| |
| /* FIXME: CS PAGING: dispatch by IMSI */ |
| |
| /* PS PAGING: dispatch by IMSI */ |
| [] BSCP.receive(f_BnsUdInd(tr_BSSGP_PS_PAGING(g_cfg.bvci), g_cfg.bvci)) -> value udi { |
| var hexstring imsi := udi.bssgp.pDU_BSSGP_PAGING_PS.iMSI.digits |
| vc_conn := f_tbl_comp_by_imsi(imsi); |
| BSSGP_SP.send(f_dec_bssgp(udi.bssgp)) to vc_conn; |
| } |
| |
| /* Any other BSSGP message: If it has TLLi, route to component; otherwise broadcast */ |
| [] BSCP.receive(f_BnsUdInd(?, g_cfg.bvci)) -> value udi { |
| var BssgpDecoded dec := f_dec_bssgp(udi.bssgp); |
| var template OCT4 tlli := f_bssgp_get_tlli(udi.bssgp); |
| if (isvalue(tlli)) { |
| vc_conn := f_tbl_comp_by_tlli(valueof(tlli)); |
| BSSGP_SP.send(dec) to vc_conn; |
| } else { |
| log("No TLLI: Broadcasting ", dec); |
| /* broadcast this message to all components */ |
| // TITAN DOESN'T DO THIS, *SIGH*: "BSSGP_SP.send(dec) to all component;" |
| for (var integer i := 0; i < sizeof(ClientTable); i := i+1) { |
| if (isbound(ClientTable[i].comp_ref)) { |
| BSSGP_SP.send(dec) to ClientTable[i].comp_ref; |
| } |
| } |
| } |
| } |
| |
| [] BSSGP_SP_SIG.receive(PDU_BSSGP:?)-> value bs_pdu sender vc_conn { |
| BSCP.send(f_BnsUdReq(bs_pdu, 0)); |
| } |
| |
| /* pass virtually any PDU from user to NS-UNITDATA PDU on network */ |
| [] BSSGP_SP.receive(PDU_BSSGP:?) -> value bs_pdu sender vc_conn { |
| BSCP.send(f_BnsUdReq(bs_pdu, g_cfg.bvci)); |
| } |
| |
| [g_cfg.sgsn_role] BSSGP_SP.receive(PDU_L3_SGSN_MS:?) -> value l3_mt sender vc_conn { |
| var integer idx := f_tbl_idx_by_comp(vc_conn); |
| var octetstring l3_enc := enc_PDU_L3_SGSN_MS(l3_mt); |
| var BIT4 sapi := f_llc_sapi_by_l3_mt(l3_mt); |
| var integer n_u := f_llc_get_n_u_tx(ClientTable[idx].llc[bit2int(sapi)]); |
| var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '1'B, n_u))); |
| //BSCP.send(f_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc)), g_cfg.bvci); |
| } |
| |
| [] BSSGP_SP.receive(PDU_LLC:?) -> value llc sender vc_conn { |
| var integer idx := f_tbl_idx_by_comp(vc_conn); |
| var octetstring llc_enc := enc_PDU_LLC(llc); |
| BSCP.send(f_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc), g_cfg.bvci)); |
| } |
| } |
| |
| function f_llc_get_n_u_tx(inout LLC_Entity llc) return uint9_t { |
| var uint9_t ret := llc.n_u_tx_next; |
| llc.n_u_tx_next := llc.n_u_tx_next + 1; |
| return ret; |
| } |
| |
| function f_llc_sapi_by_l3_mo(PDU_L3_MS_SGSN l3_mo) return BIT4 { |
| if (ischosen(l3_mo.msgs.gprs_mm)) { |
| return c_LLC_SAPI_LLGMM; |
| } else if (ischosen(l3_mo.msgs.gprs_sm)) { |
| return c_LLC_SAPI_LLGMM; |
| } else if (ischosen(l3_mo.msgs.sms)) { |
| return c_LLC_SAPI_LLSMS; |
| } |
| setverdict(fail, "No LLC SAPI for ", l3_mo); |
| mtc.stop; |
| } |
| |
| private function f_llc_sapi_by_l3_mt(PDU_L3_SGSN_MS l3_mt) return BIT4 { |
| if (ischosen(l3_mt.msgs.gprs_mm)) { |
| return c_LLC_SAPI_LLGMM; |
| } else if (ischosen(l3_mt.msgs.gprs_sm)) { |
| return c_LLC_SAPI_LLGMM; |
| } else if (ischosen(l3_mt.msgs.sms)) { |
| return c_LLC_SAPI_LLSMS; |
| } |
| setverdict(fail, "No LLC SAPI for ", l3_mt); |
| mtc.stop; |
| } |
| |
| |
| |
| private function f_ScanEvents() runs on BSSGP_CT { |
| log("matching against ", tr_BVC_RESET(?, g_cfg.bvci, g_cfg.cell_id)); |
| |
| while (true) { |
| alt { |
| [g_ptp_bvc_state == BVC_S_BLOCKED] as_blocked(); |
| [g_ptp_bvc_state == BVC_S_UNBLOCKED] as_unblocked(); |
| [] as_allstate(); |
| } |
| } /* while */ |
| } |
| |
| /* PDU_BSSGP enhanced with LLC and possibly L3 decoded payloads */ |
| type record BssgpDecoded { |
| PDU_BSSGP bssgp, |
| PDU_LLC llc optional, |
| PDU_L3_MS_SGSN l3_mo optional, |
| PDU_L3_SGSN_MS l3_mt optional, |
| PDU_SN sndcp optional |
| } |
| |
| /* Decode a PDU_BSSGP into a BssgpDecoded (i.e. with LLC/L3 decoded, as applicable) */ |
| private function f_dec_bssgp(PDU_BSSGP bssgp) runs on BSSGP_CT return BssgpDecoded { |
| var BssgpDecoded dec := { |
| bssgp := bssgp, |
| llc := omit, |
| l3_mo := omit, |
| l3_mt := omit, |
| sndcp := omit |
| }; |
| |
| /* Decode LLC, if it is a PDU that contains LLC */ |
| if (ischosen(bssgp.pDU_BSSGP_DL_UNITDATA)) { |
| dec.llc := dec_PDU_LLC(bssgp.pDU_BSSGP_DL_UNITDATA.lLC_PDU.lLC_PDU); |
| } else if (ischosen(bssgp.pDU_BSSGP_UL_UNITDATA)) { |
| dec.llc := dec_PDU_LLC(bssgp.pDU_BSSGP_UL_UNITDATA.lLC_PDU.lLC_PDU); |
| } |
| |
| /* Decode L3, if it is a LLC PDU containing L3 */ |
| if (isvalue(dec.llc) and match(dec.llc, tr_LLC_UI_L3)) { |
| if (g_cfg.sgsn_role) { |
| dec.l3_mo := dec_PDU_L3_MS_SGSN(dec.llc.pDU_LLC_UI.information_field_UI); |
| } else { |
| dec.l3_mt := dec_PDU_L3_SGSN_MS(dec.llc.pDU_LLC_UI.information_field_UI); |
| } |
| } |
| |
| /* Decode SNDCP, if it is a LLC PDU containing user plane data */ |
| if (isvalue(dec.llc) and match(dec.llc, tr_LLC_UI_USER)) { |
| dec.sndcp := dec_PDU_SN(dec.llc.pDU_LLC_UI.information_field_UI); |
| } |
| return dec; |
| } |
| |
| function f_bssgp_client_register(hexstring imsi, OCT4 tlli, BssgpCellId cell_id, BSSGP_PROC_PT PT := BSSGP_PROC[0]) |
| runs on BSSGP_Client_CT { |
| PT.call(BSSGP_register_client:{imsi, tlli, cell_id}) { |
| [] PT.getreply(BSSGP_register_client:{imsi, tlli, cell_id}) {}; |
| } |
| } |
| |
| function f_bssgp_client_unregister(hexstring imsi, BSSGP_PROC_PT PT := BSSGP_PROC[0]) |
| runs on BSSGP_Client_CT { |
| PT.call(BSSGP_unregister_client:{imsi}) { |
| [] PT.getreply(BSSGP_unregister_client:{imsi}) {}; |
| } |
| } |
| |
| /* TS 44.064 7.2.1.1 LLGMM-ASSIGN */ |
| function f_bssgp_client_llgmm_assign(OCT4 tlli_old, OCT4 tlli_new, BSSGP_PROC_PT PT := BSSGP_PROC[0]) |
| runs on BSSGP_Client_CT { |
| PT.call(BSSGP_llgmm_assign:{tlli_old, tlli_new}) { |
| [] PT.getreply(BSSGP_llgmm_assign:{tlli_old, tlli_new}) {}; |
| } |
| } |
| |
| template BssgpDecoded tr_BD_BSSGP(template PDU_BSSGP bg) := { |
| bssgp := bg, |
| llc := *, |
| l3_mo := *, |
| l3_mt := *, |
| sndcp := * |
| } |
| |
| template BssgpDecoded tr_BD_LLC(template PDU_LLC llc) := { |
| bssgp := ?, |
| llc := llc, |
| l3_mo := *, |
| l3_mt := *, |
| sndcp := * |
| } |
| |
| template BssgpDecoded tr_BD_L3_MT(template PDU_L3_SGSN_MS mt) := { |
| bssgp := ?, |
| llc := ?, |
| l3_mo := omit, |
| l3_mt := mt, |
| sndcp := omit |
| } |
| |
| template BssgpDecoded tr_BD_L3_MO(template PDU_L3_MS_SGSN mo) := { |
| bssgp := ?, |
| llc := ?, |
| l3_mo := mo, |
| l3_mt := omit, |
| sndcp := omit |
| } |
| |
| template BssgpDecoded tr_BD_SNDCP(template BIT4 sapi, template PDU_SN sn) := { |
| bssgp := ?, |
| llc := tr_LLC_UI(?, sapi), |
| l3_mo := omit, |
| l3_mt := omit, |
| sndcp := sn |
| } |
| |
| |
| |
| |
| } |