BSSGP_Emulation: Support multiple PTP-BVC within one Entity
The existing BSSGP_Emulation is built around the assumption that every
instance of BSSGP_Emulation only servers one signaling-BVC and one
PTP-BVC. While this is true for osmo-pcu at this point (BTS-colocated
PCU), other BSS/PCU implementations differ.
In general, there can always be any number of PTP BVC (one per cell)
next to the signaling BVC (one per BSS). Let's represent this in
BSSGP_Emulation so we can create more comprehensive tests.
Change-Id: I7e30b4c4e188518a574e082962fba457b3a97ce3
diff --git a/library/BSSGP_Emulation.ttcnpp b/library/BSSGP_Emulation.ttcnpp
index c1d297d..81b3c5b 100644
--- a/library/BSSGP_Emulation.ttcnpp
+++ b/library/BSSGP_Emulation.ttcnpp
@@ -1,13 +1,21 @@
module BSSGP_Emulation {
/* BSSGP Emulation in TTCN-3
- * (C) 2018-2019 Harald Welte <laforge@gnumonks.org>
+ * (C) 2018-2020 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
+ *
+ * This code implements BSSGP asa hierarchy of components:
+ * - the main BSSGP_CT which runs on top of a NSE (NS Entity).
+ * - demultiplex based on BVCI. BVCI=0 is handled to a user port
+ * - a per-BVC BSSGP_BVC_CT which runs on top of BSSGP_CT, it handles
+ * one PTP BVCI (i.e. one cell)
+ * - demultiplex based on TLLI
+ * - a per-TLLI BSSGP_Client_CT which runs on top of BSSGP_BVC_CT
*/
import from General_Types all;
@@ -35,23 +43,43 @@
}
/***********************************************************************
- * Communication between Client Components and Main Component
+ * Communication between Client Components and per-BVC component
***********************************************************************/
type record BssgpStatusIndication {
- Nsei nsei,
+ Nsei nsei optional,
BssgpBvci bvci,
BvcState state
+};
+
+type record BssgpResetIndication {
+ BssgpBvci bvci
+};
+
+template (value) BssgpStatusIndication
+ts_BssgpStsInd(template (omit) Nsei nsei, template (value) BssgpBvci bvci,
+ template (value) BvcState state) := {
+ nsei := nsei,
+ bvci := bvci,
+ state := state
}
-template BssgpStatusIndication t_BssgpStsInd(template Nsei nsei, template BssgpBvci bvci, template BvcState state) := {
+template (present) BssgpStatusIndication
+tr_BssgpStsInd(template Nsei nsei, template (present) BssgpBvci bvci,
+ template (present) BvcState state) := {
nsei := nsei,
bvci := bvci,
state := state
}
type enumerated BvcState {
+ /* SGSN role: waiting to be reset by the peer */
+ BVC_S_WAIT_RESET,
+ /* PCU role: waiting for NS_ALIVE_UNBLOCKED */
+ BVC_S_WAIT_NS_ALIVE_UNBLOCKED,
+ /* BVC-BLOCKED state */
BVC_S_BLOCKED,
+ /* BVC-UNBLOCKED state */
BVC_S_UNBLOCKED
};
@@ -103,7 +131,7 @@
;
} with { extension "internal" };
-signature BSSGP_register_client(hexstring imsi, OCT4 tlli, BssgpCellId cell_id);
+signature BSSGP_register_client(hexstring imsi, OCT4 tlli);
signature BSSGP_unregister_client(hexstring imsi);
signature BSSGP_llgmm_assign(OCT4 tlli_old, OCT4 tlli);
@@ -112,60 +140,506 @@
} with { extension "internal" };
+
/***********************************************************************
* Client Component for a single MS/TLLI
+ ***********************************************************************
+ * This is what most users will want to derive their test cases from. It
+ * provides a set of three different ports (PTP, signaling, procedure)
+ * for (currently up to 3) different Cells. Those ports are all connected
+ * to one or multiple different per-BVC compoennts, depending on whether
+ * they share the same BSS or not.
***********************************************************************/
type component BSSGP_Client_CT {
- port BSSGP_PT BSSGP[3];
- port BSSGP_PT BSSGP_SIG[3];
- port BSSGP_PROC_PT BSSGP_PROC[3];
+ /* one port array for each client; allows talking to up to 3 BVC/Cell (handover, ...) */
+ port BSSGP_PT BSSGP[3]; /* PTP-BVC */
+ port BSSGP_PT BSSGP_SIG[3]; /* Signaling BVC */
+ port BSSGP_PROC_PT BSSGP_PROC[3]; /* registration / deregistration */
};
+function f_bssgp_client_register(hexstring imsi, OCT4 tlli, BSSGP_PROC_PT PT := BSSGP_PROC[0])
+runs on BSSGP_Client_CT {
+ PT.call(BSSGP_register_client:{imsi, tlli}) {
+ [] PT.getreply(BSSGP_register_client:{imsi, tlli}) {};
+ }
+}
+
+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}) {};
+ }
+}
+
/***********************************************************************
* Main Component
+ ***********************************************************************
+ * This component exists once, and it runs on to of the NS_Emulation.
+ * It handles the BVC-RESET for the signaling BVCI, and dispatches messages
+ * to the per-BVC components running above it. Messages are routed by:
+ * - PTP BVCI in NS header (if non-0)
+ * - BVCI IE in messages on BVCI=0 in NS header
+ * Messages for which no unique BVC can be identified (like paging without
+ * a BVCI IE set) are broadcast to all BVC components.
+ * We also broadcast state changes (BssgpStatusIndication) and reset events
+ * (BssgpResetIndication) of the signaling BVC to all per-BVC components.
***********************************************************************/
-function BssgpStart(BssgpConfig cfg) runs on BSSGP_CT {
+function BssgpStart(BssgpConfig cfg, charstring id) runs on BSSGP_CT {
g_cfg := cfg;
- f_init();
- f_ScanEvents();
+
+ /* create the per-BVC components based on the configuration */
+ for (var integer i := 0; i < lengthof(g_cfg.bvc); i := i+1) {
+ var BssgpBvcConfig bvc_cfg := g_cfg.bvc[i];
+ var charstring bvc_id := id & "-BVCI" & int2str(bvc_cfg.bvci);
+ /* create, connect and start the BVC component */
+ var BSSGP_BVC_CT bvc_ct := BSSGP_BVC_CT.create(bvc_id);
+ connect(bvc_ct:BVC, self:BVC);
+ bvc_ct.start(f_bssgp_bvc_main(bvc_cfg, g_cfg.sgsn_role, bvc_id));
+ /* populate the BVC state table */
+ BvcTable[i] := {
+ bvci := bvc_cfg.bvci,
+ cell_id := bvc_cfg.cell_id,
+ comp_ref := bvc_ct
+ };
+ }
+
+ if (g_cfg.sgsn_role) {
+ /* The SGSN side waits for an inbound BVC-RESET on the signaling BVC */
+ f_sign_change_state(BVC_S_WAIT_RESET);
+ } else {
+ /* The BSS/PCU side waits for an inbound NsStatusIndication to Tx BVC-RESET */
+ f_sign_change_state(BVC_S_WAIT_NS_ALIVE_UNBLOCKED);
+ }
+
+ /* main loop */
+ f_bssgp_ScanEvents();
}
-private function f_init() runs on BSSGP_CT {
- /* Connect the UDP socket */
- f_change_state(BVC_S_BLOCKED);
-}
-
+/* master component, exists once per BSSGP instance (NSE) */
type component BSSGP_CT {
/* UDP ports towards the bottom (IUT) */
port NS_PT BSCP;
- /* NS-User SAP towards the user */
+
+ /* control by the user */
+ port BSSGP_CT_PROC_PT PROC;
+
+ var BssgpConfig g_cfg;
+
+ /* Signaling BVC (BVCI=0) */
+ var BvcState g_sign_bvc_state := BVC_S_WAIT_RESET;
+ timer g_T2 := 60.0;
+
+ /* port to per-BVC components */
+ port BSSGP_BVC_SP_PT BVC;
+ /* per-BVC state table */
+ var BvcEntity BvcTable[16];
+};
+
+/* one element in the per-BVC state table */
+type record BvcEntity {
+ /* PTP BVCI of this BVC/Cell */
+ BssgpBvci bvci,
+ /* Cell Identity of this cell */
+ BssgpCellId cell_id,
+ /* reference to the per-BVC/cell component */
+ BSSGP_BVC_CT comp_ref
+};
+
+/* find the per-BVC component for a given BVCI */
+private function f_comp_for_bvci(BssgpBvci bvci) runs on BSSGP_CT return BSSGP_BVC_CT {
+ var integer i;
+
+ for (i := 0; i < lengthof(BvcTable); i := i+1) {
+ if (BvcTable[i].bvci == bvci) {
+ return BvcTable[i].comp_ref;
+ }
+ }
+ return null;
+}
+
+/* We are in BVC_S_WAIT_RSET state (only happens in SGSN role) */
+altstep as_sig_wait_reset() runs on BSSGP_CT {
+ var NsUnitdataIndication udi;
+
+ /* Respond to RESET for signalling BVCI 0 */
+ [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, omit), 0)) -> value udi {
+ log("Rx BVC-RESET for Signaling BVCI=0");
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0));
+ f_sign_change_state(BVC_S_UNBLOCKED);
+ }
+
+ /* work-around for old, buggy libosmogb before Change-Id Ie87820537d6d616da4fd4bbf73eab06e28fda5e1 */
+ [mp_tolerate_bvc_reset_cellid] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, g_cfg.bvc[0].cell_id), 0)) -> value udi {
+ log("Rx BVC-RESET for Signaling BVCI=0");
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0));
+ f_sign_change_state(BVC_S_UNBLOCKED);
+ }
+}
+
+/* We are in BVC_S_UNBLOCKED state */
+altstep as_sig_unblocked() runs on BSSGP_CT {
+ var BSSGP_BVC_CT bvc_comp_ref;
+ var BSSGP_Client_CT vc_conn;
+ var NsUnitdataIndication udi;
+ var NsUnitdataRequest udr;
+
+ /* Messages PTP BVCI in BVCI field of NS: dispatch by that */
+ [] BSCP.receive(f_BnsUdInd(?, (2..65535))) -> value udi {
+ bvc_comp_ref := f_comp_for_bvci(valueof(udi.bvci));
+ if (isbound(bvc_comp_ref) and bvc_comp_ref != null) {
+ /* dispatch to BVC component */
+ BVC.send(udi) to bvc_comp_ref;
+ } else {
+ setverdict(fail, "Rx BSSGP for unknown PTP BVCI ", udi.bvci, ": ", udi.bssgp);
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), udi.bvci));
+ }
+ }
+
+ /* Messages with BVCI = 0 (Signaling) in BVCI field of NS */
+
+ /* Route based on PTP BVCI in payload/IE of signaling PDU */
+ [] BSCP.receive(f_BnsUdInd(?, 0)) -> value udi {
+ var template (omit) BssgpBvci ptp_bvci := f_BSSGP_BVCI_get(udi.bssgp);
+ if (istemplatekind(ptp_bvci, "omit")) {
+ log("Rx on SIG BVCI without PTP BVCI: broadcasting");
+ for (var integer i := 0; i < lengthof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(udi) to BvcTable[i].comp_ref;
+ }
+ }
+ } else {
+ bvc_comp_ref := f_comp_for_bvci(valueof(ptp_bvci));
+ if (isbound(bvc_comp_ref) and bvc_comp_ref != null) {
+ /* dispatch to BVC component */
+ BVC.send(udi) to bvc_comp_ref;
+ } else {
+ setverdict(fail, "Rx SIG BSSGP for unknown PTP BVCI ", ptp_bvci, ": ", udi.bssgp);
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ }
+ }
+ }
+
+ /* Handle PS-PAGING on SIGN BVCI with no conditional BVCI IE */
+ [] BSCP.receive(f_BnsUdInd(PDU_BSSGP:{pDU_BSSGP_PAGING_PS:=?}, 0)) -> value udi {
+ /* FIXME: use LA, RA or BSS Area to dispatch instead of broadcast */
+ for (var integer i := 0; i < lengthof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(udi) to BvcTable[i].comp_ref;
+ }
+ }
+ }
+ /* Handle CS-PAGING on SIGN BVCI with no conditional BVCI IE */
+ [] BSCP.receive(f_BnsUdInd(PDU_BSSGP:{pDU_BSSGP_PAGING_CS:=?}, 0)) -> value udi {
+ /* FIXME: use LA, RA or BSS Area to dispatch instead of broadcast */
+ for (var integer i := 0; i < lengthof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(udi) to BvcTable[i].comp_ref;
+ }
+ }
+ }
+
+ /* per-BVC component sends us something; forward to NS without any validation */
+ [] BVC.receive(NsUnitdataRequest:?) -> value udr {
+ /* patch in the NSEI, as the per-BVC components have no idea about it */
+ udr.nsei := g_cfg.nsei;
+ BSCP.send(udr);
+ }
+}
+
+/* We are in BVC_S_WAIT_NS_ALIVE_UNBLOCKED (only happens in BSS role) */
+altstep as_sig_wait_ns_alive_unblocked() runs on BSSGP_CT {
+ var NsStatusIndication nsi;
+ [] BSCP.receive(NsStatusIndication:{?,?, complement (NSE_S_ALIVE_UNBLOCKED), NSE_S_ALIVE_UNBLOCKED}) -> value nsi {
+ /* if we just became NS-unblocked, send a BCC-RESET */
+ if (g_cfg.sgsn_role == false) {
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, 0, omit), 0));
+ g_T2.start;
+ /* The BVC_RESET_ACK is handled in the as_sig_allstate() below */
+ }
+ /* Idea: We could send BVC-UNBLOCK here like some SGSN do */
+ }
+
+}
+
+/* handling of events irrespective of BVC state */
+altstep as_sig_allstate() runs on BSSGP_CT {
+ var BSSGP_Client_CT vc_conn;
+ var NsUnitdataIndication udi;
+ var NsStatusIndication nsi;
+ var ASP_Event evt;
+ var BSSGP_BVC_CT bvc_comp_ref;
+ var BssgpBvci bvci;
+
+ /* Respond to RESET for signalling BVCI 0 */
+ [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, omit), 0)) -> value udi {
+ log("Rx BVC-RESET for Signaling BVCI=0");
+ BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(0, omit), 0));
+ for (var integer i := 0; i < sizeof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(BssgpResetIndication:{0}) to BvcTable[i].comp_ref;
+ }
+ }
+ }
+
+ /* any BLOCK or UNBLOCK for the SIGNALING BVCI are illegal */
+ [] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK(0, ?), 0)) -> value udi {
+ setverdict(fail, "Rx BVC-BLOCK illegal for BVCI=0: ", udi);
+ }
+ [] BSCP.receive(f_BnsUdInd(t_BVC_UNBLOCK(0), 0)) -> value udi {
+ setverdict(fail, "Rx BVC-UNBLOCK illegal for BVCI=0: ", udi);
+ }
+ [] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK_ACK(0), 0)) -> value udi {
+ setverdict(fail, "Rx BVC-BLOCK-ACK illegal for BVCI=0: ", udi);
+ }
+ [] BSCP.receive(f_BnsUdInd(t_BVC_UNBLOCK_ACK(0), 0)) -> value udi {
+ setverdict(fail, "Rx BVC-UNBLOCK-ACK illegal for BVCI=0: ", udi);
+ }
+
+ /* Respond to BLOCK for wrong BVCI */
+ [] BSCP.receive(f_BnsUdInd(t_BVC_BLOCK(?, ?), 0)) -> value udi {
+ setverdict(fail, "Rx BVC-BLOCK for unknown BVCI");
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(0, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ }
+
+ /* Respond to RESET with wrong BVCI */
+ [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, ?, ?), 0)) -> value udi {
+ var BssgpBvci ptp_bvci := oct2int(udi.bssgp.pDU_BSSGP_BVC_RESET.bVCI.unstructured_value);
+ setverdict(fail, "Rx BVC-RESET for unknown BVCI ", ptp_bvci);
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(ptp_bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ }
+
+ /* BVC-RESET-ACK for BVCI=0 while T2 is running: Answer to a BVC-RESET we sent earlier */
+ [g_T2.running] BSCP.receive(f_BnsUdInd(tr_BVC_RESET_ACK(0, omit), 0)) -> value udi {
+ log("BVCI(0) Rx BVC-RESET-ACK");
+ g_T2.stop;
+ f_sign_change_state(BVC_S_UNBLOCKED);
+ for (var integer i := 0; i < sizeof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(BssgpResetIndication:{0}) to BvcTable[i].comp_ref;
+ }
+ }
+ }
+ [] g_T2.timeout {
+ setverdict(fail, "Timeout waiting for BVC-RESET-ACK on BVCI=0");
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(udi.bvci, BSSGP_CAUSE_BVCI_UNKNOWN, udi.bssgp), 0));
+ g_T2.start;
+ }
+
+ /* default case of handling unknown PDUs */
+ [] BSCP.receive(f_BnsUdInd(?, ?)) -> value udi {
+ setverdict(fail, "Rx Unexpected BSSGP PDU ", udi.bssgp," in state ", g_sign_bvc_state);
+ BSCP.send(f_BnsUdReq(ts_BSSGP_STATUS(0, BSSGP_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, udi.bssgp), 0));
+ }
+
+ /* Forwarding of ASP_Event to per-BVC components */
+ [] BSCP.receive(ASP_Event:?) -> value evt {
+ for (var integer i := 0; i < sizeof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(evt) to BvcTable[i].comp_ref;
+ }
+ }
+ }
+ /* Keep NS Status Indicaitons to us; no need to inform per-BVC components [for now?] */
+ [] BSCP.receive(NsStatusIndication:?) -> value nsi { }
+
+ /* Procedure port request to resolve the per-BVC component for a given ptp BVCI */
+ [] PROC.getcall(BSSGP_get_bvci_ct:{?}) -> param(bvci) sender vc_conn {
+ for (var integer i := 0; i < sizeof(BvcTable); i := i+1) {
+ if (BvcTable[i].bvci == bvci) {
+ PROC.reply(BSSGP_get_bvci_ct:{bvci} value BvcTable[i].comp_ref) to vc_conn;
+ return;
+ }
+ }
+ }
+}
+
+/* send the highest decoded layer of the message through given port */
+private function f_send_bssgp_dec(BssgpDecoded dec, BSSGP_Client_CT vc_conn, BSSGP_SP_PT pt) {
+#ifdef BSSGP_EM_L3
+ if (ispresent(dec.l3_mt)) {
+ pt.send(dec.l3_mt) to vc_conn;
+ } else if (ispresent(dec.l3_mo)) {
+ pt.send(dec.l3_mo) to vc_conn;
+ } else
+#endif
+ if (ispresent(dec.sndcp)) {
+ pt.send(dec.sndcp) to vc_conn;
+ } else if (ispresent(dec.llc)) {
+ pt.send(dec.llc) to vc_conn;
+ } else {
+ pt.send(dec.bssgp) to vc_conn;
+ }
+}
+
+
+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;
+}
+
+#ifdef BSSGP_EM_L3
+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;
+}
+#endif
+
+/* main loop of BSSGP_CT */
+private function f_bssgp_ScanEvents() runs on BSSGP_CT {
+ while (true) {
+ alt {
+ [g_sign_bvc_state == BVC_S_WAIT_RESET] as_sig_wait_reset();
+ [g_sign_bvc_state == BVC_S_WAIT_NS_ALIVE_UNBLOCKED] as_sig_wait_ns_alive_unblocked();
+ [g_sign_bvc_state == BVC_S_UNBLOCKED] as_sig_unblocked();
+ [] as_sig_allstate();
+ }
+ } /* while */
+}
+
+/* generate a send template. Cannot be a real template as we want to use g_cfg.nsei */
+private 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;
+}
+
+/* generate a receive template. Cannot be a real template as we want to use g_cfg.nsei */
+private function f_BnsUdInd(template PDU_BSSGP pdu, template BssgpBvci bvci)
+runs on BSSGP_CT return template (present) NsUnitdataIndication {
+ var template (present) NsUnitdataIndication udi := {
+ bvci := bvci,
+ nsei := g_cfg.nsei,
+ sdu := *,
+ bssgp := pdu
+ }
+ return udi;
+}
+
+/* change state of signaling BVCI; notify per-BVC components */
+private function f_sign_change_state(BvcState new_state) runs on BSSGP_CT {
+ if (new_state == g_sign_bvc_state) {
+ return;
+ }
+ log("BVCI(0) State Transition: ", g_sign_bvc_state, " -> ", new_state);
+ g_sign_bvc_state := new_state;
+ for (var integer i := 0; i < sizeof(BvcTable); i := i+1) {
+ if (isbound(BvcTable[i].comp_ref) and BvcTable[i].comp_ref != null) {
+ BVC.send(ts_BssgpStsInd(g_cfg.nsei, 0, g_sign_bvc_state)) to BvcTable[i].comp_ref;
+ }
+ }
+}
+
+/* User wants to get per-BVC component reference from BSSGP_CT */
+signature BSSGP_get_bvci_ct(BssgpBvci bvci) return BSSGP_BVC_CT;
+
+type port BSSGP_CT_PROC_PT procedure {
+ inout BSSGP_get_bvci_ct
+} with { extension "internal" };
+
+/* convenience wrapper function for user */
+function f_bssgp_get_bvci_ct(BssgpBvci bvci, BSSGP_CT_PROC_PT PT) return BSSGP_BVC_CT {
+ var BSSGP_BVC_CT res;
+ PT.call(BSSGP_get_bvci_ct:{bvci}) {
+ [] PT.getreply(BSSGP_get_bvci_ct:{bvci})-> value res {
+ return res;
+ }
+ }
+}
+
+/***********************************************************************
+ * per-BVC (Cell) Component
+ ***********************************************************************
+ * Any number of these components runs on top of the BSSGP_CT, each
+ * representing one PTP BVC within this NSE. Users (test cases) can
+ * register with TLLI and/or IMSI via the procedure port.
+ ***********************************************************************/
+
+/* per-BVC component. Exists once per cell within a BSSGP_CT */
+type component BSSGP_BVC_CT {
+ /* port towards the underlying BSSGP_CT */
+ port BSSGP_BVC_PT BVC;
+
+ /* BSSGP-User SAP towards the user (Client) */
port BSSGP_SP_PT BSSGP_SP;
port BSSGP_SP_PT BSSGP_SP_SIG;
port BSSGP_PROC_PT BSSGP_PROC;
- var BssgpConfig g_cfg;
+ var BssgpBvcConfig g_cfg;
+ var boolean g_sgsn_role;
var BvcState g_ptp_bvc_state := BVC_S_BLOCKED;
timer g_T1 := 15.0;
timer g_T2 := 60.0;
+ var boolean g_t1_waits_for_block_ack := false;
var ClientEntity ClientTable[16];
-}
+};
-type record length(16) of LLC_Entity LLC_Entities;
+/* port between global BSSGP_CT and per-BVC BSSGP_BVC_CT */
+type port BSSGP_BVC_SP_PT message {
+ in NsUnitdataRequest;
+ out ASP_Event,
+ BssgpStatusIndication,
+ BssgpResetIndication,
+ NsUnitdataIndication;
+} with { extension "internal" };
+type port BSSGP_BVC_PT message {
+ in ASP_Event,
+ BssgpStatusIndication,
+ BssgpResetIndication,
+ NsUnitdataIndication;
+ out NsUnitdataRequest;
+} with { extension "internal" };
+
+/* one element in the per-TLLI state table */
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 */
@@ -173,6 +647,7 @@
/* N(U) on receive side, last PDU */
uint9_t n_u_rx_last optional
};
+type record length(16) of LLC_Entity LLC_Entities;
function f_llc_create(boolean sgsn_role := false) return LLC_Entities {
var LLC_Entities llc;
@@ -188,6 +663,19 @@
n_u_rx_last := -
}
+/* configuration of BSSGP_CT */
+type record BssgpConfig {
+ Nsvci nsei,
+ boolean sgsn_role,
+ BssgpBvcConfigs bvc
+};
+/* Configuration of one BVC (Cell) BSSGP_BVC_CT */
+type record BssgpBvcConfig {
+ BssgpBvci bvci,
+ BssgpCellId cell_id,
+ BssgpDecodeDepth depth
+};
+type record of BssgpBvcConfig BssgpBvcConfigs;
type enumerated BssgpDecodeDepth {
BSSGP_DECODE_DEPTH_BSSGP,
BSSGP_DECODE_DEPTH_LLC,
@@ -198,83 +686,488 @@
#endif
};
-type record BssgpConfig {
- Nsvci nsei,
- Nsvci bvci,
- BssgpCellId cell_id,
- boolean sgsn_role,
- BssgpDecodeDepth depth
-};
-
-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
+/*
+private function f_tbl_init() runs on BSSGP_BVC_CT {
+ var integer i;
+ for (i := 0; i < sizeof(ImsiTable); i := i+1) {
+ ImsiTable[i] := -;
}
- 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
+ for (i := 0; i < sizeof(TlliTable); i := i+1) {
+ TlliTable[i] := -;
}
- 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_tbl_client_add(hexstring imsi, OCT4 tlli, BSSGP_Client_CT vc_conn)
+runs on BSSGP_BVC_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,
+ 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_sgsn_role));
+ }
+ return;
}
}
+ testcase.stop("Client Table full");
}
-private function f_sendReset(BssgpBvci bvci) runs on BSSGP_CT {
+private function f_tbl_client_del(hexstring imsi, BSSGP_Client_CT vc_conn) runs on BSSGP_BVC_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,
+ 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_BVC_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_BVC_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_BVC_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_BVC_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_BVC_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;
+}
+
+/* PDU_BSSGP enhanced with LLC and possibly L3 decoded payloads */
+type record BssgpDecoded {
+ PDU_BSSGP bssgp,
+ PDU_LLC llc optional,
+#ifdef BSSGP_EM_L3
+ PDU_L3_MS_SGSN l3_mo optional,
+ PDU_L3_SGSN_MS l3_mt optional,
+#endif
+ 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_BVC_CT return BssgpDecoded {
+ var BssgpDecoded dec := {
+ bssgp := bssgp,
+ llc := omit,
+#ifdef BSSGP_EM_L3
+ l3_mo := omit,
+ l3_mt := omit,
+#endif
+ sndcp := omit
+ };
+
+ /* Decode LLC, if it is a PDU that contains LLC */
+ if (g_cfg.depth >= BSSGP_DECODE_DEPTH_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 SNDCP, if it is a LLC PDU containing user plane data */
+ if (g_cfg.depth >= BSSGP_DECODE_DEPTH_SNDCP) {
+ 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);
+ }
+ }
+
+#ifdef BSSGP_EM_L3
+ /* Decode L3, if it is a LLC PDU containing L3 */
+ if (g_cfg.depth >= BSSGP_DECODE_DEPTH_L3) {
+ if (isvalue(dec.llc) and match(dec.llc, tr_LLC_UI_L3)) {
+ if (g_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);
+ }
+ }
+ }
+#endif
+
+ return dec;
+}
+
+private function f_ptp_sendUnblock() runs on BSSGP_BVC_CT {
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_UNBLOCK(g_cfg.bvci), 0));
+ g_t1_waits_for_block_ack := false;
+ g_T1.start;
+}
+
+private function f_ptp_sendBlock(BssgpCause cause) runs on BSSGP_BVC_CT {
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_BLOCK(g_cfg.bvci, cause), 0));
+ g_t1_waits_for_block_ack := true;
+ g_T1.start;
+}
+
+private function f_ptp_sendStatus(BssgpCause cause, PDU_BSSGP pdu) runs on BSSGP_BVC_CT {
+ /* FIXME: Make sure correct Signaling or PTP BVCI is used! */
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_STATUS(g_cfg.bvci, cause, pdu), g_cfg.bvci));
+}
+
+private function f_ptp_sendReset() runs on BSSGP_BVC_CT {
var PDU_BSSGP pdu;
/* The Cell Identifier IE is mandatory in the BVC-RESET PDU sent from BSS to
* SGSN in order to reset a BVC corresponding to a PTP functional entity. The
* Cell Identifier IE shall not be used in any other BVC-RESET PDU. */
- if (g_cfg.sgsn_role) {
- pdu := valueof(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, bvci, omit));
+ if (g_sgsn_role) {
+ pdu := valueof(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, g_cfg.bvci, omit));
} else {
- pdu := valueof(ts_BVC_RESET(BSSGP_CAUSE_OM_INTERVENTION, bvci, g_cfg.cell_id));
+ 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));
+ BVC.send(ts_ptp_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;
+/* PTP-BVC is in BVC_S_BLOCKED state */
+private altstep as_ptp_blocked() runs on BSSGP_BVC_CT {
+ var NsUnitdataIndication udi;
+
+ [g_T1.running and not g_t1_waits_for_block_ack] BVC.receive(tr_ptp_BnsUdInd(t_BVC_UNBLOCK_ACK(g_cfg.bvci), 0)) {
+ g_T1.stop;
+ f_ptp_change_state(BVC_S_UNBLOCKED);
+ }
+
+ /* RESET-ACK before T2 timeout: reset successful. In SGSN role, CellID must be present */
+ [g_T2.running and g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_RESET_ACK(g_cfg.bvci, g_cfg.cell_id), 0)) -> value udi {
+ g_T2.stop;
+ f_ptp_change_state(BVC_S_UNBLOCKED);
+ }
+ /* RESET-ACK before T2 timeout: reset successful. In BSS role, CellID must be absent */
+ [g_T2.running and not g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_RESET_ACK(g_cfg.bvci, omit), 0)) -> value udi {
+ g_T2.stop;
+ f_ptp_change_state(BVC_S_UNBLOCKED);
+ }
+
+ [] g_T2.timeout {
+ /* BVC-RESET-ACK PDU was not received within T2: retransmit */
+ f_ptp_sendReset();
+ }
}
-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;
+/* PTP-BVC is in UNBLOCKED state */
+private altstep as_ptp_unblocked() runs on BSSGP_BVC_CT {
+ var NsUnitdataIndication udi;
+ var NsStatusIndication nsi;
+ var BSSGP_Client_CT vc_conn;
+ var ASP_Event evt;
+ var PDU_BSSGP bs_pdu;
+ var PDU_LLC llc;
+#ifdef BSSGP_EM_L3
+ var PDU_L3_MS_SGSN l3_mo;
+ var PDU_L3_SGSN_MS l3_mt;
+#endif
+
+ /* bogus unblock, just respond with ACK */
+ [] BVC.receive(tr_ptp_BnsUdInd(t_BVC_UNBLOCK(g_cfg.bvci), 0)) -> value udi {
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_UNBLOCK_ACK(g_cfg.bvci), 0));
+ }
+ /* Respond to BLOCK with BLOCK-ACK + change state */
+ [] BVC.receive(tr_ptp_BnsUdInd(t_BVC_BLOCK(g_cfg.bvci, ?), 0)) -> value udi {
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_BLOCK_ACK(g_cfg.bvci), 0));
+ g_T1.stop;
+ f_ptp_change_state(BVC_S_BLOCKED);
+ }
+ /* BLOCK-ACK before T1 timeout: mark as blocked */
+ [g_T1.running and g_t1_waits_for_block_ack] BVC.receive(tr_ptp_BnsUdInd(t_BVC_BLOCK_ACK(g_cfg.bvci), 0)) -> value udi {
+ g_T1.stop;
+ f_ptp_change_state(BVC_S_BLOCKED);
+ }
+ /* Re-transmit BLOCK / UNBLOCK on T1 timeout */
+ [not g_t1_waits_for_block_ack] g_T1.timeout {
+ f_ptp_sendUnblock();
+ }
+ [g_t1_waits_for_block_ack] g_T1.timeout {
+ f_ptp_sendBlock(BSSGP_CAUSE_OM_INTERVENTION);
+ }
+
+ /* simply acknowledge all per-BVC Flow Control Messages */
+ [g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_FC_BVC, g_cfg.bvci)) -> value udi {
+ var OCT1 tag := udi.bssgp.pDU_BSSGP_FLOW_CONTROL_BVC.tag.unstructured_Value;
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_FC_BVC_ACK(tag), g_cfg.bvci));
+ }
+/*
+ [g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(t_BVC_FC_MS, g_cfg.bvci)) {
+ BVC.send(ts_ptp_BnsUdReq(t_BVC_FC_MS_ACK, g_cfg.bvci));
+ }
+*/
+ /* Any other PTP BSSGP message: If it has TLLI, route to component; otherwise broadcast */
+ [] BVC.receive(tr_ptp_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));
+ f_send_bssgp_dec(dec, vc_conn, BSSGP_SP);
+ } 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) and ClientTable[i].comp_ref != null) {
+ f_send_bssgp_dec(dec, ClientTable[i].comp_ref, BSSGP_SP);
+ }
+ }
+ }
+ }
+
+ /* Any other SIG BSSGP message: If it has TLLI, route to component; otherwise broadcast */
+ [] BVC.receive(tr_ptp_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));
+ f_send_bssgp_dec(dec, vc_conn, BSSGP_SP_SIG);
+ } 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) and ClientTable[i].comp_ref != null) {
+ f_send_bssgp_dec(dec, ClientTable[i].comp_ref, BSSGP_SP_SIG);
+ }
+ }
+ }
+ }
+
+ /* ConnHdlr sends BSSGP on BVCI=0 port: forward it to BSSGP_CT */
+ [] BSSGP_SP_SIG.receive(PDU_BSSGP:?)-> value bs_pdu sender vc_conn {
+ BVC.send(ts_ptp_BnsUdReq(bs_pdu, 0));
+ }
+
+ /* ConnHdlr sends BSSGP on BVCI=PTP port: forward it to BSSGP_CT */
+ [] BSSGP_SP.receive(PDU_BSSGP:?)-> value bs_pdu sender vc_conn {
+ BVC.send(ts_ptp_BnsUdReq(bs_pdu, g_cfg.bvci));
+ }
+
+#ifdef BSSGP_EM_L3
+ /* ConnHdlr sends L3: Encode and send as UL_UD / DL_UD */
+ [g_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)));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, llc_enc), g_cfg.bvci));
+ }
+ [not g_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)));
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, g_cfg.cell_id, llc_enc), g_cfg.bvci));
+ }
+#endif
+
+ /* ConnHdlr sends raw LLC: Encode and send as UL_UD / DL_UD */
+ [not g_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);
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, g_cfg.cell_id, llc_enc), g_cfg.bvci));
+ }
+ [g_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);
+ BVC.send(ts_ptp_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, llc_enc), g_cfg.bvci));
+ }
}
-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));
+/* Events permitted in all states */
+private altstep as_ptp_allstate() runs on BSSGP_BVC_CT {
+ var NsUnitdataIndication udi;
+ var BSSGP_Client_CT vc_conn;
+ var OCT4 tlli, tlli_old;
+ var hexstring imsi;
+
+ /* Signaling BVC was reset */
+ [] BVC.receive(BssgpResetIndication:{0}) {
+ if (not g_sgsn_role) {
+ f_ptp_change_state(BVC_S_BLOCKED);
+ /* when the BSS side signaling PTP is RESET, all PTP BVC must start the
+ * reset procedure */
+ f_ptp_sendReset();
+ } else {
+ f_ptp_change_state(BVC_S_UNBLOCKED);
+ }
+ }
+
+ /* we are a SGSN: BSS/PCU-originated RESET must have a cell ID */
+ [g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_RESET(?, g_cfg.bvci, g_cfg.cell_id), 0)) -> value udi {
+ log("Rx BVC-RESET from BVCI=", g_cfg.bvci);
+ /* Respond to RESET with correct BVCI but without CellID */
+ BVC.send(ts_ptp_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, omit), 0));
+ /* FIXME: reset all state? What about clients? */
+ f_ptp_change_state(BVC_S_UNBLOCKED);
+ }
+ /* we are a BSS/PCU: SGSN-originated RESET must not have a cell ID */
+ [not g_sgsn_role] BVC.receive(tr_ptp_BnsUdInd(tr_BVC_RESET(?, g_cfg.bvci, omit), 0)) -> value udi {
+ log("Rx BVC-RESET from BVCI=", g_cfg.bvci);
+ /* Respond to RESET with correct BVCI with CellID */
+ BVC.send(ts_ptp_BnsUdReq(ts_BVC_RESET_ACK(g_cfg.bvci, g_cfg.cell_id), 0));
+ /* FIXME: reset all state? What about clients? */
+ f_ptp_change_state(BVC_S_UNBLOCKED);
+ }
+
+ /* Ignore those for now */
+ [] BVC.receive(ASP_Event:?) { }
+ [] BVC.receive(BssgpStatusIndication:?) { }
+
+ /* catch-all */
+ [] BVC.receive(tr_ptp_BnsUdInd(?, 0)) -> value udi {
+ setverdict(fail, "Received unexpected NS (SIG): ", udi);
+ }
+ [] BVC.receive(tr_ptp_BnsUdInd(?, ?)) -> value udi {
+ setverdict(fail, "Received unexpected NS (PTP): ", udi);
+ }
+ [] BVC.receive {
+ setverdict(fail, "Received unexpected message from BSSGP_CT");
+ }
+
+ /* registration/deregistration of Clients (per-TLLI components) */
+ [] BSSGP_PROC.getcall(BSSGP_register_client:{?,?}) -> param(imsi, tlli) sender vc_conn {
+ f_tbl_client_add(imsi, tlli, vc_conn);
+ BSSGP_PROC.reply(BSSGP_register_client:{imsi, tlli}) 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;
+ }
+}
+
+/* main loop for per-BVC component */
+private function f_bssgp_bvc_ScanEvents() runs on BSSGP_BVC_CT {
+ while (true) {
+ alt {
+ [g_ptp_bvc_state == BVC_S_BLOCKED] as_ptp_blocked();
+ [g_ptp_bvc_state == BVC_S_UNBLOCKED] as_ptp_unblocked();
+ [] as_ptp_allstate();
+ }
+ }
+}
+
+/* main function for per-BVC Component */
+private function f_bssgp_bvc_main(BssgpBvcConfig cfg, boolean sgsn_role, charstring id) runs on BSSGP_BVC_CT {
+ g_cfg := cfg;
+ g_sgsn_role := sgsn_role;
+ f_bssgp_bvc_ScanEvents();
+}
+
+template (value) NsUnitdataRequest ts_ptp_BnsUdReq(template (value) PDU_BSSGP pdu, template (value) BssgpBvci bvci) := {
+ bvci := bvci,
+ nsei := 0, // overwritten in BSSGP_CT
+ /* 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
+}
+
+template (present) NsUnitdataIndication tr_ptp_BnsUdInd(template (present) PDU_BSSGP pdu, template (present) BssgpBvci bvci) := {
+ bvci := bvci,
+ nsei := ?,
+ sdu := *,
+ bssgp := pdu
+}
+
+/* change state of PTP BVC; broadcast state change to clients */
+private function f_ptp_change_state(BvcState new_state) runs on BSSGP_BVC_CT {
+ if (new_state == g_ptp_bvc_state) {
+ return;
+ }
+ log("BVCI(", g_cfg.bvci, ") 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) and ClientTable[i].comp_ref != null) {
+ BSSGP_SP.send(ts_BssgpStsInd(omit, g_cfg.bvci, g_ptp_bvc_state)) to ClientTable[i].comp_ref;
+ }
+ }
}
/* attempt to extract the TLLI from a BSSGP PDU */
@@ -323,515 +1216,6 @@
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;
-}
-
-private function f_send_bvc_reset_ack(BssgpBvci bvci) runs on BSSGP_CT {
- /* The Cell Identifier IE is mandatory in the BVC-RESET-ACK PDU sent from BSS to
- * SGSN in response to reset a BVC corresponding to a PTP functional entity. The Cell
- * Identifier IE shall not be used in any other BVC-RESET-ACK PDU */
- if (g_cfg.sgsn_role) {
- BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(bvci, omit), 0));
- } else {
- BSCP.send(f_BnsUdReq(ts_BVC_RESET_ACK(bvci, g_cfg.cell_id), 0));
- }
-}
-
-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);
- f_send_bvc_reset_ack(g_cfg.bvci);
- f_change_state(BVC_S_UNBLOCKED);
- }
-
- /* Respond to RESET for signalling BVCI 0 */
- [] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, omit), 0)) -> value udi {
- log("Rx BVC-RESET for Signaling BVCI=0");
- f_send_bvc_reset_ack(0);
- }
-
- /* work-around for old, buggy libosmogb before Change-Id Ie87820537d6d616da4fd4bbf73eab06e28fda5e1 */
- [mp_tolerate_bvc_reset_cellid] BSCP.receive(f_BnsUdInd(tr_BVC_RESET(?, 0, g_cfg.cell_id), 0)) -> value udi {
- log("Rx BVC-RESET for Signaling BVCI=0");
- f_send_bvc_reset_ack(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(g_cfg.bvci);
- }
- /* 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();
- }
-}
-
-private function f_send_bssgp_dec(BssgpDecoded dec, BSSGP_Client_CT vc_conn, BSSGP_SP_PT pt := BSSGP_SP) runs on BSSGP_CT {
-#ifdef BSSGP_EM_L3
- if (ispresent(dec.l3_mt)) {
- pt.send(dec.l3_mt) to vc_conn;
- } else if (ispresent(dec.l3_mo)) {
- pt.send(dec.l3_mo) to vc_conn;
- } else
-#endif
- if (ispresent(dec.sndcp)) {
- pt.send(dec.sndcp) to vc_conn;
- } else if (ispresent(dec.llc)) {
- pt.send(dec.llc) to vc_conn;
- } else {
- pt.send(dec.bssgp) to vc_conn;
- }
-}
-
-
-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;
-#ifdef BSSGP_EM_L3
- var PDU_L3_MS_SGSN l3_mo;
- var PDU_L3_SGSN_MS l3_mt;
-#endif
-
- /* 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);
- f_send_bssgp_dec(f_dec_bssgp(udi.bssgp), 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));
- f_send_bssgp_dec(dec, 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)) {
- f_send_bssgp_dec(dec, 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));
- f_send_bssgp_dec(dec, vc_conn, BSSGP_SP_SIG);
- } 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)) {
- f_send_bssgp_dec(dec, ClientTable[i].comp_ref, BSSGP_SP_SIG);
- }
- }
- }
- }
-
-
- /* 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));
- }
-
-#ifdef BSSGP_EM_L3
- /* 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));
- }
-#endif
-
- /* 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;
-}
-
-#ifdef BSSGP_EM_L3
-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;
-}
-#endif
-
-
-
-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,
-#ifdef BSSGP_EM_L3
- PDU_L3_MS_SGSN l3_mo optional,
- PDU_L3_SGSN_MS l3_mt optional,
-#endif
- 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,
-#ifdef BSSGP_EM_L3
- l3_mo := omit,
- l3_mt := omit,
-#endif
- sndcp := omit
- };
-
- /* Decode LLC, if it is a PDU that contains LLC */
- if (g_cfg.depth >= BSSGP_DECODE_DEPTH_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 SNDCP, if it is a LLC PDU containing user plane data */
- if (g_cfg.depth >= BSSGP_DECODE_DEPTH_SNDCP) {
- 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);
- }
- }
-
-#ifdef BSSGP_EM_L3
- /* Decode L3, if it is a LLC PDU containing L3 */
- if (g_cfg.depth >= BSSGP_DECODE_DEPTH_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);
- }
- }
- }
-#endif
-
- 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}) {};
- }
-}
}