| module BSSAP_LE_Emulation { |
| |
| /* BSSAP_LE Emulation, runs on top of BSSAP_LE_CodecPort. It multiplexes/demultiplexes |
| * the individual connections, so there can be separate TTCN-3 components handling |
| * each of the connections. |
| * |
| * The BSSAP_LE_Emulation.main() function processes SCCP primitives from the SCCP |
| * stack via the BSSAP_CodecPort, and dispatches them to the per-connection components. |
| * |
| * Outbound BSSAP/SCCP connections are initiated by sending a BSSAP_LE_Conn_Req primitive |
| * to the component running the BSSAP_LE_Emulation.main() function. |
| * |
| * For each new inbound connections, the BssapLeOps.create_cb() is called. It can create |
| * or resolve a TTCN-3 component, and returns a component reference to which that inbound |
| * connection is routed/dispatched. |
| * |
| * If a pre-existing component wants to register to handle a future inbound connection, it can |
| * do so by registering an "expect" with the expected Layer 3 (DTAP) payload. This is e.g. useful |
| * if you are simulating BTS + MSC, and first trigger a connection from BTS/RSL side in a |
| * component which then subsequently should also handle the MSC emulation. |
| * |
| * Inbound Unit Data messages (such as are dispatched to the BssapLeOps.unitdata_cb() callback, |
| * which is registered with an argument to the main() function below. |
| * |
| * (C) 2017-2020 by 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. |
| */ |
| |
| |
| import from General_Types all; |
| import from Osmocom_Types all; |
| import from SCCP_Emulation all; |
| import from SCCPasp_Types all; |
| import from IPA_Emulation all; |
| import from MobileL3_Types all; |
| import from Misc_Helpers all; |
| |
| import from BSSAP_LE_Types all; |
| import from BSSAP_LE_CodecPort all; |
| import from BSSMAP_LE_Templates all; |
| import from BSSMAP_Templates all; |
| import from RAN_Emulation all; |
| |
| /* General "base class" component definition, of which specific implementations |
| * derive themselves by means of the "extends" feature */ |
| type component BSSAP_LE_ConnHdlr { |
| /* port towards MSC Emulator core / SCCP connection dispatchar */ |
| port BSSAP_LE_Conn_PT BSSAP_LE; |
| /* procedure based port to register for incoming connections */ |
| port BSSAP_LE_PROC_PT BSSAP_LE_PROC; |
| } |
| |
| /* Auxiliary primitive that can happen on the port between per-connection client and this dispatcher */ |
| type enumerated BSSAP_LE_Conn_Prim { |
| /* SCCP tell us that connection was released */ |
| CONN_PRIM_DISC_IND, |
| /* we tell SCCP to release connection */ |
| CONN_PRIM_DISC_REQ, |
| /* Connection confirmed indication */ |
| CONN_PRIM_CONF_IND |
| } |
| |
| /* port between individual per-connection components and this dispatcher */ |
| type port BSSAP_LE_Conn_PT message { |
| inout |
| PDU_BSSAP_LE, |
| BSSAP_LE_N_UNITDATA_req, |
| /* Client requests us to create SCCP Connection */ |
| BSSAP_LE_Conn_Req, |
| /* direct DTAP messages from/to clients */ |
| PDU_DTAP_MO, PDU_DTAP_MT, |
| PDU_DTAP_PS_MO, PDU_DTAP_PS_MT, |
| /* misc indications / requests between SCCP and client */ |
| BSSAP_LE_Conn_Prim; |
| } with { extension "internal" }; |
| |
| type uint2_t N_Sd_Array[4]; |
| |
| /* represents a single BSSAP connection over SCCP */ |
| type record ConnectionData { |
| /* reference to the instance of the per-connection component */ |
| BSSAP_LE_ConnHdlr comp_ref, |
| integer sccp_conn_id, |
| /* array of N(SD) values for MO DTAP messages, indexed by discriminator */ |
| N_Sd_Array n_sd |
| } |
| |
| type record ImsiMapping { |
| BSSAP_LE_ConnHdlr comp_ref, |
| hexstring imsi optional, |
| OCT4 tmsi |
| } |
| |
| type component BSSAP_LE_Emulation_CT { |
| /* SCCP ports on the bottom side, using ASP primitives */ |
| port BSSAP_LE_CODEC_PT BSSAP_LE; |
| /* BSSAP port to the per-connection clients */ |
| port BSSAP_LE_Conn_PT CLIENT; |
| |
| /* use 16 as this is also the number of SCCP connections that SCCP_Emulation can handle */ |
| var ConnectionData ConnectionTable[16]; |
| |
| /* pending expected incoming connections */ |
| var ExpectData ExpectTable[8]; |
| |
| /* tables for mapping inbound unitdata (like paging) */ |
| var ImsiMapping ImsiTable[16]; |
| |
| /* procedure based port to register for incoming connections */ |
| port BSSAP_LE_PROC_PT PROC; |
| |
| var charstring g_ran_id; |
| var integer g_next_e1_ts := 1; |
| var BssapLeOps g_ran_ops; |
| var boolean g_reset_ack_ready := false; |
| }; |
| |
| private function f_conn_id_known(integer sccp_conn_id) |
| runs on BSSAP_LE_Emulation_CT return boolean { |
| var integer i; |
| for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].sccp_conn_id == sccp_conn_id){ |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private function f_comp_known(BSSAP_LE_ConnHdlr client) |
| runs on BSSAP_LE_Emulation_CT return boolean { |
| var integer i; |
| for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].comp_ref == client) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /* resolve component reference by connection ID */ |
| private function f_comp_by_conn_id(integer sccp_conn_id) |
| runs on BSSAP_LE_Emulation_CT return BSSAP_LE_ConnHdlr { |
| var integer i; |
| for (i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].sccp_conn_id == sccp_conn_id) { |
| return ConnectionTable[i].comp_ref; |
| } |
| } |
| setverdict(fail, "BSSAP-LE Connection table not found by SCCP Connection ID ", sccp_conn_id); |
| mtc.stop; |
| } |
| |
| /* resolve connection ID by component reference */ |
| private function f_conn_id_by_comp(BSSAP_LE_ConnHdlr client) |
| runs on BSSAP_LE_Emulation_CT return integer { |
| for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].comp_ref == client) { |
| return ConnectionTable[i].sccp_conn_id; |
| } |
| } |
| setverdict(fail, "BSSAP-LE Connection table not found by component ", client); |
| mtc.stop; |
| } |
| |
| /* resolve ConnectionTable index component reference */ |
| private function f_idx_by_comp(BSSAP_LE_ConnHdlr client) |
| runs on BSSAP_LE_Emulation_CT return integer { |
| for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].comp_ref == client) { |
| return i; |
| } |
| } |
| setverdict(fail, "BSSAP-LE Connection table not found by component ", client); |
| mtc.stop; |
| } |
| |
| private function f_gen_conn_id() |
| runs on BSSAP_LE_Emulation_CT return integer { |
| var integer conn_id; |
| |
| do { |
| conn_id := float2int(rnd()*SCCP_Emulation.tsp_max_ConnectionId); |
| } while (f_conn_id_known(conn_id) == true); |
| |
| return conn_id; |
| } |
| |
| private function f_conn_table_init() |
| runs on BSSAP_LE_Emulation_CT { |
| for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| ConnectionTable[i].comp_ref := null; |
| ConnectionTable[i].sccp_conn_id := -1; |
| ConnectionTable[i].n_sd := { 0, 0, 0, 0 }; |
| } |
| for (var integer i := 0; i < sizeof(ImsiTable); i := i+1) { |
| ImsiTable[i].comp_ref := null; |
| ImsiTable[i].imsi := omit; |
| ImsiTable[i].tmsi := 'FFFFFFFF'O; |
| } |
| } |
| |
| private function f_conn_table_add(BSSAP_LE_ConnHdlr comp_ref, integer sccp_conn_id) |
| runs on BSSAP_LE_Emulation_CT { |
| for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].sccp_conn_id == -1) { |
| ConnectionTable[i].comp_ref := comp_ref; |
| ConnectionTable[i].sccp_conn_id := sccp_conn_id; |
| ConnectionTable[i].n_sd := { 0, 0, 0, 0 }; |
| log("Added conn table entry ", i, comp_ref, sccp_conn_id); |
| return; |
| } |
| } |
| testcase.stop("BSSAP-LE Connection table full!"); |
| } |
| |
| private function f_conn_table_del(integer sccp_conn_id) |
| runs on BSSAP_LE_Emulation_CT { |
| for (var integer i := 0; i < sizeof(ConnectionTable); i := i+1) { |
| if (ConnectionTable[i].sccp_conn_id == sccp_conn_id) { |
| log("Deleted conn table entry ", i, |
| ConnectionTable[i].comp_ref, sccp_conn_id); |
| ConnectionTable[i].sccp_conn_id := -1; |
| ConnectionTable[i].comp_ref := null; |
| return |
| } |
| } |
| setverdict(fail, "BSSAP-LE Connection table attempt to delete non-existant ", sccp_conn_id); |
| mtc.stop; |
| } |
| |
| private function f_imsi_table_find(hexstring imsi, template OCT4 tmsi) |
| runs on BSSAP_LE_Emulation_CT return BSSAP_LE_ConnHdlr { |
| for (var integer i := 0; i < sizeof(ImsiTable); i := i+1) { |
| if (ImsiTable[i].imsi == imsi or |
| isvalue(tmsi) and match(ImsiTable[i].tmsi, tmsi)) { |
| return ImsiTable[i].comp_ref; |
| } |
| } |
| return null; |
| } |
| |
| type record BSSAP_LE_Conn_Req { |
| SCCP_PAR_Address addr_peer, |
| SCCP_PAR_Address addr_own, |
| PDU_BSSAP_LE bssap |
| } |
| template BSSAP_LE_Conn_Req ts_BSSAP_LE_Conn_Req(SCCP_PAR_Address peer, SCCP_PAR_Address own, PDU_BSSAP_LE bssap) := { |
| addr_peer := peer, |
| addr_own := own, |
| bssap := bssap |
| }; |
| |
| /* handle (optional) userData portion of various primitives and dispatch it to the client */ |
| private function f_handle_userData(BSSAP_LE_ConnHdlr client, PDU_BSSAP_LE bssap) |
| runs on BSSAP_LE_Emulation_CT { |
| /* decode + send decoded BSSAP to client */ |
| |
| if (ischosen(bssap.pdu.dtap) and g_ran_ops.decode_dtap) { |
| if (g_ran_ops.role_ms) { |
| /* we are the MS, so any message to us must be MT */ |
| var PDU_DTAP_MT mt := { |
| dlci := bssap.dlci, |
| dtap := dec_PDU_ML3_NW_MS(bssap.pdu.dtap) |
| }; |
| CLIENT.send(mt) to client; |
| } else { |
| /* we are the Network, so any message to us must be MO */ |
| var PDU_DTAP_MO mo := { |
| dlci := bssap.dlci, |
| dtap := dec_PDU_ML3_MS_NW(bssap.pdu.dtap) |
| }; |
| CLIENT.send(mo) to client; |
| } |
| } else { |
| CLIENT.send(bssap) to client; |
| } |
| } |
| |
| /* call-back type, to be provided by specific implementation; called when new SCCP connection |
| * arrives */ |
| type function BssmapLeCreateCallback(BSSAP_LE_N_CONNECT_ind conn_ind, charstring id) |
| runs on BSSAP_LE_Emulation_CT return BSSAP_LE_ConnHdlr; |
| |
| type function BssmapLeUnitdataCallback(PDU_BSSAP_LE bssap) |
| runs on BSSAP_LE_Emulation_CT return template PDU_BSSAP_LE; |
| |
| /* handle common Unitdata such as Paging */ |
| private function CommonBssmapUnitdataCallback(PDU_BSSAP_LE bssap) |
| runs on BSSAP_LE_Emulation_CT return template PDU_BSSAP_LE { |
| if (match(bssap, tr_BSSMAP_LE_Paging)) { |
| var BSSAP_LE_ConnHdlr client := null; |
| client := f_imsi_table_find(bssap.pdu.bssmap.paging.iMSI.digits, |
| bssap.pdu.bssmap.paging.tMSI.tmsiOctets); |
| if (client != null) { |
| log("CommonBssmapUnitdataCallback: IMSI/TMSI found in table, dispatching to ", |
| client); |
| CLIENT.send(bssap) to client; |
| return omit; |
| } |
| log("CommonBssmapUnitdataCallback: IMSI/TMSI not found in table"); |
| } else { |
| log("CommonBssmapUnitdataCallback: Not a paging message"); |
| } |
| /* ELSE: handle in user callback */ |
| return g_ran_ops.unitdata_cb.apply(bssap); |
| } |
| |
| private function f_bssap_le_reset(SCCP_PAR_Address peer, SCCP_PAR_Address own) runs on BSSAP_LE_Emulation_CT { |
| timer T := 5.0; |
| |
| BSSAP_LE.send(ts_BSSAP_LE_UNITDATA_req(peer, own, ts_BSSMAP_LE_Reset(GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE))); |
| T.start; |
| alt { |
| [] BSSAP_LE.receive(tr_BSSAP_LE_UNITDATA_ind(own, peer, tr_BSSMAP_LE_ResetAck)) { |
| log("BSSMAP-LE: Received RESET-ACK in response to RESET, we're ready to go!"); |
| g_reset_ack_ready := true; |
| } |
| [] as_reset_ack(); |
| [] BSSAP_LE.receive { repeat }; |
| [] T.timeout { |
| setverdict(fail, "BSSMAP-LE: Timeout waiting for RESET-ACK after sending RESET"); |
| mtc.stop; |
| } |
| } |
| } |
| |
| private function f_bssap_l3_is_rr(PDU_BSSAP_LE bssap) return boolean { |
| var template octetstring l3 := f_bssap_le_extract_l3(bssap); |
| return f_L3_is_rr(l3); |
| } |
| |
| |
| |
| type record BssapLeOps { |
| BssmapLeCreateCallback create_cb optional, |
| BssmapLeUnitdataCallback unitdata_cb optional, |
| boolean decode_dtap, |
| boolean role_ms, |
| /* needed for performing BSSMAP RESET */ |
| SCCP_PAR_Address sccp_addr_local optional, |
| SCCP_PAR_Address sccp_addr_peer optional |
| } |
| |
| private altstep as_reset_ack() runs on BSSAP_LE_Emulation_CT { |
| var BSSAP_LE_N_UNITDATA_ind ud_ind; |
| [] BSSAP_LE.receive(tr_BSSAP_LE_UNITDATA_ind(?, ?, tr_BSSMAP_LE_Reset)) -> value ud_ind { |
| log("BSSMAP-LE: Responding to inbound RESET with RESET-ACK"); |
| BSSAP_LE.send(ts_BSSAP_LE_UNITDATA_req(ud_ind.callingAddress, ud_ind.calledAddress, |
| ts_BSSMAP_LE_ResetAck)); |
| g_reset_ack_ready := true; |
| repeat; |
| } |
| } |
| |
| |
| private altstep as_main_bssap_le() runs on BSSAP_LE_Emulation_CT { |
| var BSSAP_LE_N_UNITDATA_ind ud_ind; |
| var BSSAP_LE_N_CONNECT_ind conn_ind; |
| var BSSAP_LE_N_CONNECT_cfm conn_cfm; |
| var BSSAP_LE_N_DATA_ind data_ind; |
| var BSSAP_LE_N_DISCONNECT_ind disc_ind; |
| var BSSAP_LE_Conn_Req creq; |
| var PDU_BSSAP_LE bssap; |
| var BSSAP_LE_N_UNITDATA_req bssap_ud; |
| var BSSAP_LE_ConnHdlr vc_conn; |
| var integer targetPointCode; |
| var N_Sd_Array last_n_sd; |
| |
| /* SCCP -> Client: UNIT-DATA (connectionless SCCP) from a BSC */ |
| [] BSSAP_LE.receive(BSSAP_LE_N_UNITDATA_ind:?) -> value ud_ind { |
| /* Connectionless Procedures like RESET */ |
| var template PDU_BSSAP_LE resp; |
| resp := CommonBssmapUnitdataCallback(ud_ind.userData); |
| if (isvalue(resp)) { |
| BSSAP_LE.send(ts_BSSAP_LE_UNITDATA_req(ud_ind.callingAddress, |
| ud_ind.calledAddress, resp)); |
| } |
| } |
| /* SCCP -> Client: new connection from BSC */ |
| [] BSSAP_LE.receive(BSSAP_LE_N_CONNECT_ind:?) -> value conn_ind { |
| vc_conn := g_ran_ops.create_cb.apply(conn_ind, g_ran_id); |
| /* store mapping between client components and SCCP connectionId */ |
| f_conn_table_add(vc_conn, conn_ind.connectionId); |
| /* handle user payload */ |
| f_handle_userData(vc_conn, conn_ind.userData); |
| /* confirm connection establishment */ |
| BSSAP_LE.send(ts_BSSAP_LE_CONNECT_res(conn_ind.connectionId, omit)); |
| } |
| /* SCCP -> Client: connection-oriented data in existing connection */ |
| [] BSSAP_LE.receive(BSSAP_LE_N_DATA_ind:?) -> value data_ind { |
| vc_conn := f_comp_by_conn_id(data_ind.connectionId); |
| if (ispresent(data_ind.userData)) { |
| f_handle_userData(vc_conn, data_ind.userData); |
| } |
| } |
| /* SCCP -> Client: disconnect of an existing connection */ |
| [] BSSAP_LE.receive(BSSAP_LE_N_DISCONNECT_ind:?) -> value disc_ind { |
| vc_conn := f_comp_by_conn_id(disc_ind.connectionId); |
| if (ispresent(disc_ind.userData)) { |
| f_handle_userData(vc_conn, disc_ind.userData); |
| } |
| /* notify client about termination */ |
| var BSSAP_LE_Conn_Prim prim := CONN_PRIM_DISC_IND; |
| CLIENT.send(prim) to vc_conn; |
| f_conn_table_del(disc_ind.connectionId); |
| /* TOOD: return confirm to other side? */ |
| } |
| /* SCCP -> Client: connection confirm for outbound connection */ |
| [] BSSAP_LE.receive(BSSAP_LE_N_CONNECT_cfm:?) -> value conn_cfm { |
| vc_conn := f_comp_by_conn_id(conn_cfm.connectionId); |
| var BSSAP_LE_Conn_Prim prim := CONN_PRIM_CONF_IND; |
| CLIENT.send(prim) to vc_conn; |
| /* handle user payload */ |
| if (ispresent(conn_cfm.userData)) { |
| f_handle_userData(vc_conn, conn_cfm.userData); |
| } |
| } |
| [] CLIENT.receive(PDU_BSSAP_LE:?) -> value bssap sender vc_conn { |
| var integer conn_id := f_conn_id_by_comp(vc_conn); |
| /* send it to dispatcher */ |
| BSSAP_LE.send(ts_BSSAP_LE_DATA_req(conn_id, bssap)); |
| } |
| |
| [] CLIENT.receive(BSSAP_LE_N_UNITDATA_req:?) -> value bssap_ud sender vc_conn { |
| BSSAP_LE.send(bssap_ud); |
| } |
| |
| /* Disconnect request client -> SCCP */ |
| [] CLIENT.receive(BSSAP_LE_Conn_Prim:CONN_PRIM_DISC_REQ) -> sender vc_conn { |
| var integer conn_id := f_conn_id_by_comp(vc_conn); |
| BSSAP_LE.send(ts_BSSAP_LE_DISC_req(conn_id, 0)); |
| f_conn_table_del(conn_id); |
| } |
| |
| /* BSSAP from client -> SCCP */ |
| [] CLIENT.receive(BSSAP_LE_Conn_Req:?) -> value creq sender vc_conn { |
| var integer conn_id; |
| /* send to dispatcher */ |
| |
| if (f_comp_known(vc_conn) == false) { |
| /* unknown client, create new connection */ |
| conn_id := f_gen_conn_id(); |
| |
| /* store mapping between client components and SCCP connectionId */ |
| f_conn_table_add(vc_conn, conn_id); |
| |
| BSSAP_LE.send(ts_BSSAP_LE_CONNECT_req(creq.addr_peer, creq.addr_own, conn_id, |
| creq.bssap)); |
| } else { |
| /* known client, send via existing connection */ |
| conn_id := f_conn_id_by_comp(vc_conn); |
| BSSAP_LE.send(ts_BSSAP_LE_DATA_req(conn_id, creq.bssap)); |
| } |
| |
| /* InitialL3 contains RR (PAG RESP) or MM (CM SRV REQ), we must increment |
| * counter only on MM/CC/SS, but not on RR */ |
| if (g_ran_ops.role_ms and not f_bssap_l3_is_rr(creq.bssap)) { |
| /* we have just sent the first MM message, increment the counter */ |
| var integer idx := f_idx_by_comp(vc_conn); |
| ConnectionTable[idx].n_sd[0] := 1; |
| log("patch: N(SD) for ConnIdx ", idx, " set to 1"); |
| } |
| } |
| |
| [] PROC.getcall(BSSAP_LE_last_n_sd:{?,-}) -> param(vc_conn) { |
| var integer idx := f_idx_by_comp(vc_conn); |
| last_n_sd := ConnectionTable[idx].n_sd; |
| PROC.reply(BSSAP_LE_last_n_sd:{vc_conn, last_n_sd}) to vc_conn; |
| } |
| |
| [] PROC.getcall(BSSAP_LE_continue_after_n_sd:{?,?}) -> param(last_n_sd, vc_conn) { |
| var integer idx := f_idx_by_comp(vc_conn); |
| ConnectionTable[idx].n_sd := last_n_sd; |
| PROC.reply(BSSAP_LE_continue_after_n_sd:{last_n_sd, vc_conn}) to vc_conn; |
| } |
| } |
| |
| |
| /* send a raw (encoded) L3 message over given SCCP connection */ |
| private function f_xmit_raw_l3(integer sccp_conn_id, OCT1 dlci, octetstring l3_enc) runs on BSSAP_LE_Emulation_CT |
| { |
| var PDU_BSSAP_LE bssap; |
| bssap := valueof(ts_BSSAP_LE_DTAP(l3_enc, dlci)); |
| BSSAP_LE.send(ts_BSSAP_LE_DATA_req(sccp_conn_id, bssap)); |
| } |
| |
| /* patch N(SD) into enc_l3, according to 24.007 11.2.3.2 */ |
| private function f_ML3_patch_seq(inout ConnectionData cd, in PDU_ML3_MS_NW dtap, inout octetstring enc_l3) { |
| var integer n_sd_idx := f_ML3_n_sd_idx(dtap); |
| if (n_sd_idx < 0) { |
| return; |
| } |
| var uint2_t seq_nr := f_next_n_sd(cd.n_sd, n_sd_idx); |
| f_ML3_patch_seq_nr(seq_nr, enc_l3); |
| } |
| |
| function main(BssapLeOps ops, charstring id) runs on BSSAP_LE_Emulation_CT { |
| |
| g_ran_id := id; |
| g_ran_ops := ops; |
| f_conn_table_init(); |
| f_expect_table_init(); |
| |
| if (isvalue(ops.sccp_addr_peer) and isvalue(ops.sccp_addr_local)) { |
| f_sleep(1.0); /* HACK to wait for M3UA/ASP to be ACTIVE */ |
| f_bssap_le_reset(ops.sccp_addr_peer, ops.sccp_addr_local); |
| } |
| |
| while (true) { |
| var BSSAP_LE_ConnHdlr vc_conn; |
| var PDU_DTAP_MO dtap_mo; |
| var PDU_DTAP_MT dtap_mt; |
| var BSSAP_LE_ConnHdlr vc_hdlr; |
| var octetstring l3_info; |
| var hexstring imsi; |
| var OCT4 tmsi; |
| var integer targetPointCode; |
| |
| alt { |
| [] as_main_bssap_le(); |
| |
| [g_ran_ops.role_ms] CLIENT.receive(PDU_DTAP_MO:?) -> value dtap_mo sender vc_conn { |
| var integer idx := f_idx_by_comp(vc_conn); |
| /* convert from decoded DTAP to encoded DTAP */ |
| var octetstring l3_enc := enc_PDU_ML3_MS_NW(dtap_mo.dtap); |
| /* patch correct L3 send sequence number N(SD) into l3_enc */ |
| if (dtap_mo.skip_seq_patching == false) { |
| f_ML3_patch_seq(ConnectionTable[idx], dtap_mo.dtap, l3_enc); |
| } |
| f_xmit_raw_l3(ConnectionTable[idx].sccp_conn_id, dtap_mo.dlci, l3_enc); |
| } |
| |
| [not g_ran_ops.role_ms] CLIENT.receive(PDU_DTAP_MT:?) -> value dtap_mt sender vc_conn { |
| var integer idx := f_idx_by_comp(vc_conn); |
| /* convert from decoded DTAP to encoded DTAP */ |
| var octetstring l3_enc := enc_PDU_ML3_NW_MS(dtap_mt.dtap); |
| f_xmit_raw_l3(ConnectionTable[idx].sccp_conn_id, dtap_mt.dlci, l3_enc); |
| } |
| |
| [] PROC.getcall(BSSAP_LE_register:{?,?}) -> param(l3_info, vc_hdlr) { |
| f_create_expect(l3_info, vc_hdlr); |
| PROC.reply(BSSAP_LE_register:{l3_info, vc_hdlr}) to vc_hdlr; |
| } |
| |
| [] PROC.getcall(BSSAP_LE_register_handoverRequest:{?,?}) -> param(targetPointCode, vc_hdlr) { |
| f_create_expect(omit, vc_hdlr, targetPointCode); |
| PROC.reply(BSSAP_LE_register_handoverRequest:{targetPointCode, vc_hdlr}) to vc_hdlr; |
| } |
| |
| [] PROC.getcall(BSSAP_LE_register_imsi:{?,?,?}) -> param(imsi, tmsi, vc_hdlr) { |
| f_create_imsi(imsi, tmsi, vc_hdlr); |
| |
| /* Wait for RESET-ACK if not received yet */ |
| if (not g_reset_ack_ready) { |
| var integer wait_seconds := 10; |
| timer T_reset_ack := 1.0; |
| T_reset_ack.start; |
| alt { |
| [wait_seconds > 0] T_reset_ack.timeout { |
| if (g_reset_ack_ready) { |
| break; |
| } |
| wait_seconds := wait_seconds - 1; |
| T_reset_ack.start; |
| repeat; |
| } |
| |
| [wait_seconds == 0] T_reset_ack.timeout { |
| setverdict(fail, "BSSMAP-LE: Timeout waiting for RESET-ACK"); |
| mtc.stop; |
| } |
| } |
| } |
| |
| PROC.reply(BSSAP_LE_register_imsi:{imsi, tmsi, vc_hdlr}) to vc_hdlr; |
| } |
| |
| |
| } |
| } |
| } |
| |
| /*********************************************************************** |
| * "Expect" Handling (mapping for expected incoming SCCP connections) |
| ***********************************************************************/ |
| |
| /* data about an expected future incoming connection */ |
| type record ExpectData { |
| /* L3 payload based on which we can match it */ |
| octetstring l3_payload optional, |
| integer handoverRequestPointCode optional, |
| /* component reference for this connection */ |
| BSSAP_LE_ConnHdlr vc_conn |
| } |
| |
| /* procedure based port to register for incoming connections */ |
| signature BSSAP_LE_register(in octetstring l3, in BSSAP_LE_ConnHdlr hdlr); |
| signature BSSAP_LE_register_handoverRequest(in integer targetPointCode, in BSSAP_LE_ConnHdlr hdlr); |
| |
| /* procedure based port to register for incoming IMSI/TMSI */ |
| signature BSSAP_LE_register_imsi(in hexstring imsi, in OCT4 tmsi, in BSSAP_LE_ConnHdlr hdlr); |
| |
| /* If DTAP happens across other channels (e.g. GSUP), provide manual advancing of the n_sd sequence number */ |
| signature BSSAP_LE_last_n_sd(in BSSAP_LE_ConnHdlr hdlr, out N_Sd_Array last_n_sd); |
| |
| /* Update conn's n_sd sequence nr after the connection was taken over from elsewhere */ |
| signature BSSAP_LE_continue_after_n_sd(N_Sd_Array last_n_sd, in BSSAP_LE_ConnHdlr hdlr); |
| |
| type port BSSAP_LE_PROC_PT procedure { |
| inout BSSAP_LE_register, BSSAP_LE_register_imsi, BSSAP_LE_register_handoverRequest, BSSAP_LE_last_n_sd, BSSAP_LE_continue_after_n_sd; |
| } with { extension "internal" }; |
| |
| /* CreateCallback that can be used as create_cb and will use the expectation table */ |
| function ExpectedCreateCallback(BSSAP_LE_N_CONNECT_ind conn_ind, charstring id) |
| runs on BSSAP_LE_Emulation_CT return BSSAP_LE_ConnHdlr { |
| var BSSAP_LE_ConnHdlr ret := null; |
| var octetstring l3_info; |
| var integer i; |
| |
| if (ischosen(conn_ind.userData.pdu.bssmap.perf_loc_req)) { |
| var BSSMAP_LE_PerfLocReq plr := conn_ind.userData.pdu.bssmap.perf_loc_req; |
| if (not ispresent(plr.imsi)) { |
| log("ExpectedCreateCallback: Cannot handle PerformLocReq without IMSI!"); |
| mtc.stop; |
| } |
| var hexstring imsi := plr.imsi.imsi.oddEvenInd_identity.imsi.digits; |
| /* Find the component by the IMSI [usually] contained in this message */ |
| ret := f_imsi_table_find(imsi, omit); |
| if (ret != null) { |
| log("ExpectedCreateCallback: Found ConnHdlr ", ret, " for IMSI ", imsi); |
| return ret; |
| } |
| } else if (ischosen(conn_ind.userData.pdu.bssmap.completeLayer3Information)) { |
| l3_info := conn_ind.userData.pdu.bssmap.completeLayer3Information.layer3Information.layer3info; |
| log("ExpectedCreateCallback completeLayer3Information"); |
| } else { |
| setverdict(fail, "N-CONNECT.ind with L3 != { PerformLocReq | COMPLETE L3 }"); |
| mtc.stop; |
| } |
| |
| for (i := 0; i < sizeof(ExpectTable); i:= i+1) { |
| if (not ispresent(ExpectTable[i].l3_payload)) { |
| continue; |
| } |
| if (l3_info == ExpectTable[i].l3_payload) { |
| ret := ExpectTable[i].vc_conn; |
| /* release this entry to be used again */ |
| ExpectTable[i].l3_payload := omit; |
| ExpectTable[i].vc_conn := null; |
| log("Found Expect[", i, "] for ", l3_info, " handled at ", ret); |
| /* return the component reference */ |
| return ret; |
| } |
| } |
| setverdict(fail, "Couldn't find Expect for incoming connection ", conn_ind); |
| mtc.stop; |
| } |
| |
| |
| private function f_create_expect(template octetstring l3, BSSAP_LE_ConnHdlr hdlr, |
| template integer handoverRequestPointCode := omit) |
| runs on BSSAP_LE_Emulation_CT { |
| var integer i; |
| log("f_create_expect(l3 := ", l3, ", handoverRequest := ", handoverRequestPointCode); |
| for (i := 0; i < sizeof(ExpectTable); i := i+1) { |
| if (not ispresent(ExpectTable[i].l3_payload) |
| and not ispresent(ExpectTable[i].handoverRequestPointCode)) { |
| if (ispresent(l3)) { |
| ExpectTable[i].l3_payload := valueof(l3); |
| } |
| if (ispresent(handoverRequestPointCode)) { |
| ExpectTable[i].handoverRequestPointCode := valueof(handoverRequestPointCode); |
| } |
| ExpectTable[i].vc_conn := hdlr; |
| if (ispresent(handoverRequestPointCode)) { |
| log("Created Expect[", i, "] for handoverRequest to be handled at ", hdlr); |
| } else { |
| log("Created Expect[", i, "] for ", l3, " to be handled at ", hdlr); |
| } |
| return; |
| } |
| } |
| testcase.stop("No space left in ExpectTable"); |
| } |
| |
| private function f_create_imsi(hexstring imsi, OCT4 tmsi, BSSAP_LE_ConnHdlr hdlr) |
| runs on BSSAP_LE_Emulation_CT { |
| for (var integer i := 0; i < sizeof(ImsiTable); i := i+1) { |
| if (not ispresent(ImsiTable[i].imsi)) { |
| ImsiTable[i].imsi := imsi; |
| ImsiTable[i].tmsi := tmsi; |
| ImsiTable[i].comp_ref := hdlr; |
| log("Created IMSI[", i, "] for ", imsi, tmsi, " to be handled at ", hdlr); |
| return; |
| } |
| } |
| testcase.stop("No space left in ImsiTable"); |
| } |
| |
| |
| private function f_expect_table_init() |
| runs on BSSAP_LE_Emulation_CT { |
| for (var integer i := 0; i < sizeof(ExpectTable); i := i+1) { |
| ExpectTable[i].l3_payload := omit; |
| ExpectTable[i].handoverRequestPointCode := omit; |
| } |
| } |
| |
| /* helper function for clients to register their IMSI/TMSI */ |
| /* FIXME: there is no TMSI in BSSMAP-LE */ |
| function f_bssap_le_register_imsi(hexstring imsi, template (omit) OCT4 tmsi_or_omit) |
| runs on BSSAP_LE_ConnHdlr { |
| var OCT4 tmsi; |
| |
| /* Resolve omit to a special reserved value */ |
| if (istemplatekind(tmsi_or_omit, "omit")) { |
| tmsi := 'FFFFFFFF'O; |
| } else { |
| tmsi := valueof(tmsi_or_omit); |
| } |
| |
| BSSAP_LE_PROC.call(BSSAP_LE_register_imsi:{imsi, tmsi, self}) { |
| [] BSSAP_LE_PROC.getreply(BSSAP_LE_register_imsi:{?,?,?}) {}; |
| } |
| } |
| |
| |
| } |