ttcn3
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osmo-ttcn3-hacks
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osmo-ttcn3-hacks/library/BSSGP_Emulation.ttcn

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module BSSGP_Emulation {
/* BSSGP Emulation in TTCN-3
* (C) 2018-2019 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 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;
}
}
log("Warning: Could not find client for IMSI ", imsi);
return;
}
/* 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 PTP 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;
}
}
}
}
/* Any other SIG BSSGP message: If it has TLLi, route to component; otherwise broadcast */
[] BSCP.receive(f_BnsUdInd(?, 0)) -> 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_SIG.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_SIG.send(dec) to ClientTable[i].comp_ref;
}
}
}
}
/* ConnHdlr sends BSSGP on BVCI=0 port: forward it to BSSGP Codec Port */
[] BSSGP_SP_SIG.receive(PDU_BSSGP:?)-> value bs_pdu sender vc_conn {
BSCP.send(f_BnsUdReq(bs_pdu, 0));
}
/* ConnHdlr sends BSSGP on BVCI=PTP port: forward it to BSSGP Codec Port */
[] BSSGP_SP.receive(PDU_BSSGP:?) -> value bs_pdu sender vc_conn {
BSCP.send(f_BnsUdReq(bs_pdu, g_cfg.bvci));
}
/* ConnHdlr sends L3: Encode and send as UL_UD / DL_UD */
[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, llc_enc), g_cfg.bvci));
}
[not g_cfg.sgsn_role] BSSGP_SP.receive(PDU_L3_MS_SGSN:?) -> value l3_mo sender vc_conn {
var integer idx := f_tbl_idx_by_comp(vc_conn);
var octetstring l3_enc := enc_PDU_L3_MS_SGSN(l3_mo);
var BIT4 sapi := f_llc_sapi_by_l3_mo(l3_mo);
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_UL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc), g_cfg.bvci));
}
/* ConnHdlr sends raw LLC: Encode and send as UL_UD / DL_UD */
[not g_cfg.sgsn_role] 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));
}
[g_cfg.sgsn_role] 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_DL_UD(ClientTable[idx].tlli, 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
}
}
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