638 lines
19 KiB
Plaintext
638 lines
19 KiB
Plaintext
/* GPRS-NS Emulation in TTCN-3
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* (C) 2018-2020 Harald Welte <laforge@gnumonks.org>
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* contributions by sysmocom - s.f.m.c. GmbH
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* All rights reserved.
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*
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* Released under the terms of GNU General Public License, Version 2 or
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* (at your option) any later version.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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module NS_Emulation {
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import from Misc_Helpers all;
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import from NS_Types all;
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import from BSSGP_Types all;
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import from Osmocom_Types all;
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import from Osmocom_Gb_Types all;
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import from NS_Provider_IPL4 all;
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#ifdef NS_EMULATION_FR
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import from NS_Provider_FR all;
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#endif
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import from IPL4asp_Types all;
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type record NsUnitdataRequest {
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BssgpBvci bvci,
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Nsei nsei,
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integer lsp,
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octetstring sdu optional,
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PDU_BSSGP bssgp optional
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}
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template NsUnitdataRequest tr_NsUdReq(template Nsei nsei, template BssgpBvci bvci, template integer lsp,
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template octetstring sdu, template PDU_BSSGP bssgp) := {
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bvci := bvci,
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nsei := nsei,
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lsp := lsp,
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sdu := sdu,
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bssgp := bssgp
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}
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template (value) NsUnitdataRequest ts_NsUdReq(template (value) Nsei nsei,
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template (value) BssgpBvci bvci,
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template (value) integer lsp,
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template (omit) octetstring sdu,
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template (omit) PDU_BSSGP bssgp) := {
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bvci := bvci,
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nsei := nsei,
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lsp := lsp,
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sdu := sdu,
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bssgp := bssgp
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}
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type record NsUnitdataIndication {
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BssgpBvci bvci,
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Nsei nsei,
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Nsvci nsvci,
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octetstring sdu optional,
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PDU_BSSGP bssgp optional
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}
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template (present) NsUnitdataIndication tr_NsUdInd(template (present) Nsei nsei,
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template (present) BssgpBvci bvci,
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template octetstring sdu) := {
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bvci := bvci,
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nsei := nsei,
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nsvci := ?,
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sdu := sdu,
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bssgp := ?
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}
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template (value) NsUnitdataIndication ts_NsUdInd(Nsei nsei, Nsvci nsvci, BssgpBvci bvci, octetstring sdu) := {
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bvci := bvci,
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nsei := nsei,
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nsvci := nsvci,
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sdu := sdu,
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bssgp := dec_PDU_BSSGP(sdu)
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}
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type record NsStatusIndication {
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Nsei nsei,
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Nsvci nsvci,
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NsvcState old_state,
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NsvcState new_state,
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boolean first_or_last
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}
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template (present) NsStatusIndication tr_NsStsInd(template (present) Nsei nsei := ?,
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template (present) Nsvci nsvci := ?,
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template (present) NsvcState old_state := ?,
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template (present) NsvcState state := ?,
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template (present) boolean first_or_last := ?) := {
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nsei := nsei,
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nsvci := nsvci,
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old_state := old_state,
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new_state := state,
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first_or_last := first_or_last
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}
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template (value) NsStatusIndication ts_NsStsInd(Nsei nsei, Nsvci nsvci, NsvcState old_state, NsvcState state,
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boolean first_or_last := false) := {
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nsei := nsei,
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nsvci := nsvci,
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old_state := old_state,
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new_state := state,
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first_or_last := first_or_last
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}
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type enumerated NsvcState {
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NSVC_S_DEAD_BLOCKED,
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NSVC_S_WAIT_RESET,
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NSVC_S_ALIVE_BLOCKED,
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NSVC_S_ALIVE_UNBLOCKED
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}
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/* port from our (internal) point of view */
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type port NS_SP_PT message {
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in NsUnitdataRequest;
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out NsUnitdataIndication,
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NsStatusIndication;
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} with { extension "internal" };
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/* port from the user point of view */
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type port NS_PT message {
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in ASP_Event,
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NsStatusIndication,
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NsUnitdataIndication;
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out NsUnitdataRequest;
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} with { extension "internal" };
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type component NS_Provider_CT {
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/* upper port, facing to NS_Emulation:NSCP */
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port NS_PROVIDER_PT NSE;
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/* lower layer ports (UDP/IP, Frame Relay) are added in derived components */
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};
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type enumerated NS_Provider_LinkStatus {
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NS_PROV_LINK_STATUS_UP,
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NS_PROV_LINK_STATUS_DOWN
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};
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type union NS_Provider_Evt {
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NS_Provider_LinkStatus link_status
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};
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/* port between NS_Provider and NS_CT */
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type port NS_PROVIDER_PT message {
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inout PDU_NS, NS_Provider_Evt;
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} with { extension "internal" };
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type record NSVCConfigurationIP {
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AddressFamily address_family,
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PortNumber local_udp_port,
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charstring local_ip,
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PortNumber remote_udp_port,
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charstring remote_ip
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};
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type record NSVCConfigurationFR {
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charstring netdev, /* HDLC net-device for AF_PACKET socket */
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integer dlci
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};
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type union NSVCConfigurationP {
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NSVCConfigurationIP ip,
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NSVCConfigurationFR fr
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};
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type record NSVCConfiguration {
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NSVCConfigurationP provider,
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Nsvci nsvci
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};
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type record of NSVCConfiguration NSVCConfigurations;
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type record NSConfiguration {
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Nsvci nsei,
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boolean role_sgsn,
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boolean handle_sns,
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NSVCConfigurations nsvc
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}
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/***********************************************************************
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* per NS-VCG component. Exists once per [peer of] NSE
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***********************************************************************/
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type component NS_CT {
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/* NS-User SAP towards the user */
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port NS_SP_PT NS_SP;
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/* port towards the per-NSVC components */
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port NS_PT NSVC;
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/* all of the NS configuration a user passes to us */
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var NSConfiguration g_config;
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var charstring g_id;
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/* references to the per-NSVC components */
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var NsvcTable g_nsvcs := {};
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/* list of indexes to g_nsvcs[] of currently unblocked NSVCs */
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var ro_integer g_unblocked_nsvcs := {};
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};
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type record NsvcTableEntry {
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Nsvci nsvci,
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NSVC_CT vc_conn,
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NsvcState state
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};
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type record of NsvcTableEntry NsvcTable;
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type record of integer ro_integer;
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/* add one NSVC (component and table entry */
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function f_nsvc_add(NSVCConfiguration nsvc_cfg) runs on NS_CT {
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var charstring nsvc_id := g_id & "-NSVCI" & int2str(nsvc_cfg.nsvci);
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var NsvcTableEntry te;
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te.nsvci := nsvc_cfg.nsvci;
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te.vc_conn := NSVC_CT.create(nsvc_id);
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te.state := NSVC_S_DEAD_BLOCKED;
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connect(self:NSVC, te.vc_conn:NS_SP);
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te.vc_conn.start(NSVCStart(nsvc_cfg, g_config, nsvc_id));
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g_nsvcs := g_nsvcs & { te };
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/* no need to add to g_unblocked_nsvcs, as state is always DEAD_BLOCKED above */
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}
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function f_nsvc_find_idx(Nsvci nsvci) runs on NS_CT return integer {
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var integer i;
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for (i := 0; i < lengthof(g_nsvcs); i := i+1) {
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if (g_nsvcs[i].nsvci == nsvci) {
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return i;
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}
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}
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return -1;
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}
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function f_nsvc_find(Nsvci nsvci) runs on NS_CT return NSVC_CT {
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var integer i := f_nsvc_find_idx(nsvci);
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if (i < 0) {
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return null;
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} else {
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return g_nsvcs[i].vc_conn;
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}
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}
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function f_nsvc_update_state(Nsvci nsvci, NsvcState state) runs on NS_CT {
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var integer i := f_nsvc_find_idx(nsvci);
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if (i < 0) {
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return;
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}
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if (g_nsvcs[i].state != NSVC_S_ALIVE_UNBLOCKED and state == NSVC_S_ALIVE_UNBLOCKED) {
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/* add index to list of unblocked NSVCs */
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g_unblocked_nsvcs := g_unblocked_nsvcs & {i};
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} else if (g_nsvcs[i].state == NSVC_S_ALIVE_UNBLOCKED and state != NSVC_S_ALIVE_UNBLOCKED) {
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/* remove index to list of unblocked NSVCs */
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var ro_integer new_unblocked_nsvcs := {};
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for (var integer j := 0; j < lengthof(g_unblocked_nsvcs); j := j+1) {
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if (g_unblocked_nsvcs[j] != i) {
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new_unblocked_nsvcs := new_unblocked_nsvcs & {j};
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}
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}
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g_unblocked_nsvcs := new_unblocked_nsvcs;
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}
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g_nsvcs[i].state := state;
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}
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function NSStart(NSConfiguration init_config, charstring id := testcasename()) runs on NS_CT {
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g_config := init_config;
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g_id := id;
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/* iterate over list of NS-VCs and start per-NSVC components */
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for (var integer i := 0; i < lengthof(g_config.nsvc); i := i+1) {
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var NSVCConfiguration nsvc_cfg := g_config.nsvc[i];
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f_nsvc_add(nsvc_cfg);
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}
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while (true) {
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alt {
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[] as_ns_common() {}
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}
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}
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}
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function f_count_nsvcs_in_state(template NsvcState state := ?) runs on NS_CT return integer {
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var integer i;
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var integer res := 0;
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for (i := 0; i < lengthof(g_nsvcs); i := i+1) {
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if (match(g_nsvcs[i].state, state)) {
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res := res + 1;
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}
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}
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return res;
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}
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private altstep as_ns_common() runs on NS_CT {
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var NsStatusIndication rx_nssi;
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var NsUnitdataIndication rx_nsudi;
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var NsUnitdataRequest rx_nsudr;
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/* pass from NS-VCs up to user */
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[] NSVC.receive(tr_NsStsInd(g_config.nsei, ?, ?, NSVC_S_ALIVE_UNBLOCKED)) -> value rx_nssi {
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/* check if this one is the first to be unblocked */
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var integer num_nsvc_unblocked := f_count_nsvcs_in_state(NSVC_S_ALIVE_UNBLOCKED);
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f_nsvc_update_state(rx_nssi.nsvci, rx_nssi.new_state);
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if (num_nsvc_unblocked == 0) {
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rx_nssi.first_or_last := true;
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}
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NS_SP.send(rx_nssi);
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}
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[] NSVC.receive(tr_NsStsInd(g_config.nsei, ?, ?, NSVC_S_DEAD_BLOCKED)) -> value rx_nssi {
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f_nsvc_update_state(rx_nssi.nsvci, rx_nssi.new_state);
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/* check if this one is the last to be blocked */
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var integer num_nsvc_unblocked := f_count_nsvcs_in_state(NSVC_S_ALIVE_UNBLOCKED);
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if (num_nsvc_unblocked == 0) {
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rx_nssi.first_or_last := true;
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}
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NS_SP.send(rx_nssi);
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}
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[] NSVC.receive(tr_NsStsInd(g_config.nsei, ?, ?, ?)) -> value rx_nssi {
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f_nsvc_update_state(rx_nssi.nsvci, rx_nssi.new_state);
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NS_SP.send(rx_nssi);
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}
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[] NSVC.receive(tr_NsStsInd) -> value rx_nssi {
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Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
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log2str("Received NsStatusInd for invalid NSEI: ", rx_nssi));
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}
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[] NSVC.receive(tr_NsUdInd(g_config.nsei, ?, ?)) -> value rx_nsudi {
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NS_SP.send(rx_nsudi);
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}
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[] NSVC.receive(tr_NsUdInd(?, ?, ?)) -> value rx_nsudi {
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Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
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log2str("Received UnitDataInd for invalid NSEI: ", rx_nsudi));
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}
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/* from user down to NS-VC */
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[] NS_SP.receive(tr_NsUdReq(g_config.nsei, ?, ?, ?, *)) -> value rx_nsudr {
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/* load distribution function */
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var integer nsvc_idx := g_unblocked_nsvcs[rx_nsudr.lsp mod lengthof(g_unblocked_nsvcs)];
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NSVC.send(rx_nsudr) to g_nsvcs[nsvc_idx].vc_conn;
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}
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[] NS_SP.receive(tr_NsUdReq(?, ?, ?, ?, *)) -> value rx_nsudr {
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Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
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log2str("Received NsUnitdataReq for invalid NSEI: ", rx_nsudr));
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}
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}
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/***********************************************************************
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per-NSVC component. Exists once for each NS-VC in the NS-VCG
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***********************************************************************/
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type component NSVC_CT {
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/* UDP port towards the bottom (IUT) */
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port NS_PROVIDER_PT NSCP;
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var NS_Provider_IPL4_CT vc_NSP_IP;
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#ifdef NS_EMULATION_FR
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var NS_Provider_FR_CT vc_NSP_FR;
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#endif
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/* port towards the NS_CT */
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port NS_SP_PT NS_SP;
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/* configuration passed by the user */
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var NSVCConfiguration g_nsvc_config;
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/* we cannot access the NS_CT.config and hence need to copy those */
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var NSConfiguration g_config;
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var NsvcState vc_state := NSVC_S_DEAD_BLOCKED;
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timer Tns_alive := 3.0;
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timer Tns_test := 10.0;
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timer Tns_block := 10.0;
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timer Tns_reset := 10.0;
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}
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function NSVCStart(NSVCConfiguration init_config, NSConfiguration init_g_config, charstring id := testcasename()) runs on NSVC_CT {
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g_nsvc_config := init_config;
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g_config := init_g_config;
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f_init(id & "-NSVCemu" & int2str(g_nsvc_config.nsvci));
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f_ScanEvents();
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}
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private function f_init(charstring id) runs on NSVC_CT {
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var Result res;
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if (ischosen(g_nsvc_config.provider.ip)) {
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/* Connect the UDP socket */
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vc_NSP_IP := NS_Provider_IPL4_CT.create(id & "-provIP");
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connect(self:NSCP, vc_NSP_IP:NSE);
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vc_NSP_IP.start(NS_Provider_IPL4.main(g_nsvc_config, g_config, id));
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#ifdef NS_EMULATION_FR
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} else if (ischosen(g_nsvc_config.provider.fr)) {
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vc_NSP_FR := NS_Provider_FR_CT.create(id & "-provFR");
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connect(self:NSCP, vc_NSP_FR:NSE);
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vc_NSP_FR.start(NS_Provider_FR.main(g_nsvc_config, g_config, id));
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#endif
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} else {
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Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unsupported NS provider");
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}
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f_change_state(NSVC_S_DEAD_BLOCKED);
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}
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private function f_change_state(NsvcState new_state) runs on NSVC_CT {
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var NsvcState old_state := vc_state;
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vc_state := new_state;
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log("NSVC ", g_nsvc_config.nsvci, " State Transition: ", old_state, " -> ", new_state);
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NS_SP.send(ts_NsStsInd(g_config.nsei, g_nsvc_config.nsvci, old_state, new_state));
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}
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private function f_sendReset() runs on NSVC_CT {
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NSCP.send(ts_NS_RESET(NS_CAUSE_OM_INTERVENTION, g_nsvc_config.nsvci, g_config.nsei));
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Tns_reset.start;
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vc_state := NSVC_S_WAIT_RESET;
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}
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private function f_sendAlive() runs on NSVC_CT {
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NSCP.send(t_NS_ALIVE);
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Tns_alive.start;
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}
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private function f_sendUnblock() runs on NSVC_CT {
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NSCP.send(t_NS_UNBLOCK);
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Tns_block.start;
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}
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private function f_sendBlock(NsCause cause) runs on NSVC_CT {
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NSCP.send(ts_NS_BLOCK(cause, g_nsvc_config.nsvci));
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Tns_block.start;
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}
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private altstep as_allstate() runs on NSVC_CT {
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var PDU_NS rf;
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var ASP_Event evt;
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/* transition to DEAD if t_alive times out */
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[] Tns_alive.timeout {
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log("Tns-alive expired: changing to DEAD_BLOCKED + starting Tns-test");
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f_change_state(NSVC_S_DEAD_BLOCKED);
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Tns_test.start;
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}
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[] Tns_test.timeout {
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log("Tns-test expired: sending NS-ALIVE");
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f_sendAlive();
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}
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/* Stop t_alive when receiving ALIVE-ACK */
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[Tns_alive.running] NSCP.receive(t_NS_ALIVE_ACK) {
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log("Rx NS-ALIVE-ACK: stopping Tns-alive; starting Tns-test");
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Tns_alive.stop;
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Tns_test.start;
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}
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/* respond to NS-ALIVE with NS-ALIVE-ACK */
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[] NSCP.receive(t_NS_ALIVE) {
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NSCP.send(t_NS_ALIVE_ACK);
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}
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/* Respond to BLOCK for wrong NSVCI */
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[] NSCP.receive(tr_NS_BLOCK(?, ?)) -> value rf {
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log("Rx NS-BLOCK for unknown NSVCI");
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/* FIXME */
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}
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[not g_config.handle_sns] as_handle_reset();
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[g_config.role_sgsn and g_config.handle_sns and ischosen(g_nsvc_config.provider.ip)] as_sns_sgsn();
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/* default case of handling unknown PDUs */
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[] NSCP.receive(PDU_NS: ?) -> value rf {
|
|
log("Rx Unexpected NS PDU ", rf," in state ", vc_state);
|
|
NSCP.send(ts_NS_STATUS(NS_CAUSE_PDU_NOT_COMPATIBLE_WITH_PROTOCOL_STATE, rf));
|
|
}
|
|
}
|
|
|
|
private altstep as_handle_reset() runs on NSVC_CT {
|
|
var PDU_NS rf;
|
|
|
|
[g_config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) {
|
|
log("Provider Link came up: waiting for NS-RESET");
|
|
}
|
|
|
|
[not g_config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) {
|
|
log("Provider Link came up: sending NS-RESET");
|
|
f_sendReset();
|
|
}
|
|
|
|
/* Respond to RESET with correct NSEI/NSVCI */
|
|
[] NSCP.receive(tr_NS_RESET(?, g_nsvc_config.nsvci, g_config.nsei)) -> value rf {
|
|
f_change_state(NSVC_S_ALIVE_BLOCKED);
|
|
NSCP.send(ts_NS_RESET_ACK(g_nsvc_config.nsvci, g_config.nsei));
|
|
log("Rx NS-RESET: Sending NS-ALIVE");
|
|
f_sendAlive();
|
|
Tns_test.start;
|
|
}
|
|
|
|
/* Respond to RESET with wrong NSEI/NSVCI */
|
|
[] NSCP.receive(tr_NS_RESET(?, ?, ?)) -> value rf {
|
|
log("Rx NS-RESET for unknown NSEI/NSVCI");
|
|
/* FIXME */
|
|
}
|
|
}
|
|
|
|
/* simple IP Sub-Network Service responder for the SGSN side. This is not a full implementation
|
|
* of the protocol, merely sufficient to make the PCU/BSS side happy to proceed */
|
|
private altstep as_sns_sgsn() runs on NSVC_CT {
|
|
var PDU_NS rf;
|
|
[g_config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) {
|
|
log("Provider Link came up: sending NS-ALIVE");
|
|
f_sendAlive();
|
|
}
|
|
|
|
[not g_config.role_sgsn] NSCP.receive(NS_Provider_Evt:{link_status:=NS_PROV_LINK_STATUS_UP}) {
|
|
log("Provider Link came up: sending NS-ALIVE");
|
|
f_sendAlive();
|
|
}
|
|
|
|
[] NSCP.receive(tr_SNS_SIZE(g_config.nsei)) -> value rf {
|
|
/* blindly acknowledge whatever the PCU sends */
|
|
NSCP.send(ts_SNS_SIZE_ACK(g_config.nsei, omit));
|
|
}
|
|
[] NSCP.receive(tr_SNS_SIZE(?)) {
|
|
setverdict(fail, "SNS-SIZE from unexpected NSEI");
|
|
self.stop;
|
|
}
|
|
[] NSCP.receive(tr_SNS_CONFIG(g_config.nsei, true,
|
|
{tr_SNS_IPv4(g_nsvc_config.provider.ip.remote_ip,
|
|
g_nsvc_config.provider.ip.remote_udp_port)})) -> value rf {
|
|
/* blindly acknowledge whatever the PCU sends */
|
|
NSCP.send(ts_SNS_CONFIG_ACK(g_config.nsei, omit));
|
|
/* send a SNS-CONFIG in response and expect a SNS-CONFIG-ACK */
|
|
var IP4_Elements v4 := { valueof(ts_SNS_IPv4(g_nsvc_config.provider.ip.local_ip,
|
|
g_nsvc_config.provider.ip.local_udp_port)) };
|
|
NSCP.send(ts_SNS_CONFIG(g_config.nsei, true, v4));
|
|
alt {
|
|
[] NSCP.receive(tr_SNS_CONFIG_ACK(g_config.nsei, omit)) {
|
|
/* success */
|
|
}
|
|
[] NSCP.receive(tr_SNS_CONFIG_ACK(g_config.nsei, ?)) {
|
|
setverdict(fail, "Unexpected SNS-CONFIG-NACK");
|
|
self.stop;
|
|
}
|
|
}
|
|
}
|
|
[] NSCP.receive(tr_SNS_CONFIG(g_config.nsei, false, ?)) { /* ignore */}
|
|
[] NSCP.receive(tr_SNS_CONFIG(g_config.nsei, true, ?)) {
|
|
setverdict(fail, "Unexpected SNS-CONFIG content");
|
|
self.stop;
|
|
}
|
|
[] NSCP.receive(tr_SNS_CONFIG(?, ?, ?)) {
|
|
setverdict(fail, "SNS-CONFIG from unexpected NSEI");
|
|
self.stop;
|
|
}
|
|
}
|
|
|
|
private altstep as_alive_blocked() runs on NSVC_CT {
|
|
var PDU_NS rf;
|
|
/* bogus block, just respond with ACK */
|
|
[] NSCP.receive(tr_NS_BLOCK(?, g_nsvc_config.nsvci)) -> value rf {
|
|
NSCP.send(ts_NS_BLOCK_ACK(g_nsvc_config.nsvci));
|
|
}
|
|
/* Respond to UNBLOCK with UNBLOCK-ACK + change state */
|
|
[] NSCP.receive(t_NS_UNBLOCK) -> value rf {
|
|
NSCP.send(t_NS_UNBLOCK_ACK);
|
|
Tns_block.stop;
|
|
f_change_state(NSVC_S_ALIVE_UNBLOCKED);
|
|
}
|
|
[] NSCP.receive(t_NS_UNBLOCK_ACK) -> value rf {
|
|
Tns_block.stop;
|
|
f_change_state(NSVC_S_ALIVE_UNBLOCKED);
|
|
}
|
|
/* tolerate a late NS-BLOCK-ACK from peer */
|
|
[] NSCP.receive(tr_NS_BLOCK_ACK(g_nsvc_config.nsvci)) -> value rf {
|
|
}
|
|
[] Tns_block.timeout {
|
|
/* repeat unblock transmission */
|
|
f_sendUnblock();
|
|
}
|
|
}
|
|
|
|
private altstep as_alive_unblocked() runs on NSVC_CT {
|
|
var NsUnitdataRequest ud_req;
|
|
var PDU_NS rf;
|
|
/* bogus unblock, just respond with ACK */
|
|
[] NSCP.receive(t_NS_UNBLOCK) -> value rf {
|
|
NSCP.send(t_NS_UNBLOCK_ACK);
|
|
}
|
|
/* Respond to BLOCK with BLOCK-ACK + change state */
|
|
[] NSCP.receive(tr_NS_BLOCK(?, g_nsvc_config.nsvci)) -> value rf {
|
|
NSCP.send(ts_NS_BLOCK_ACK(g_nsvc_config.nsvci));
|
|
Tns_block.stop;
|
|
f_change_state(NSVC_S_ALIVE_BLOCKED);
|
|
}
|
|
[] NSCP.receive(tr_NS_BLOCK_ACK(g_nsvc_config.nsvci)) -> value rf {
|
|
Tns_block.stop;
|
|
}
|
|
/* tolerate a late NS-UNBLOCK-ACK from peer */
|
|
[] NSCP.receive(t_NS_UNBLOCK_ACK) -> value rf {
|
|
}
|
|
/* NS-UNITDATA PDU from network to NS-UNITDATA.ind to user */
|
|
[] NSCP.receive(tr_NS_UNITDATA(?, ?, ?)) -> value rf {
|
|
NS_SP.send(ts_NsUdInd(g_config.nsei, g_nsvc_config.nsvci,
|
|
oct2int(rf.pDU_NS_Unitdata.bVCI),
|
|
rf.pDU_NS_Unitdata.nS_SDU));
|
|
}
|
|
/* NS-UNITDATA.req from user to NS-UNITDATA PDU on network */
|
|
[] NS_SP.receive(tr_NsUdReq(g_config.nsei, ?, ?, ?, omit)) -> value ud_req {
|
|
/* using raw octetstring PDU */
|
|
NSCP.send(ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, ud_req.sdu));
|
|
}
|
|
[] NS_SP.receive(tr_NsUdReq(g_config.nsei, ?, ?, omit, ?)) -> value ud_req {
|
|
/* using decoded BSSGP PDU that we need to encode first */
|
|
var octetstring enc := enc_PDU_BSSGP(ud_req.bssgp);
|
|
NSCP.send(ts_NS_UNITDATA(t_SduCtrlB, ud_req.bvci, enc));
|
|
}
|
|
}
|
|
|
|
private altstep as_wait_reset() runs on NSVC_CT {
|
|
var PDU_NS rf;
|
|
[] Tns_reset.timeout {
|
|
/* If the sending entity of an NS-RESET PDU receives no NS-RESET-ACK PDU before timer
|
|
* Tns-reset expires the corresponding NS-VCs shall remain blocked and dead and the
|
|
* entire reset procedure shall be repeated */
|
|
f_sendReset();
|
|
}
|
|
[] NSCP.receive(tr_NS_RESET_ACK(g_nsvc_config.nsvci, g_config.nsei)) -> value rf {
|
|
Tns_reset.stop;
|
|
f_change_state(NSVC_S_ALIVE_BLOCKED);
|
|
f_sendAlive();
|
|
f_sendUnblock();
|
|
}
|
|
}
|
|
|
|
private function f_ScanEvents() runs on NSVC_CT {
|
|
var PDU_NS rf;
|
|
while (true) {
|
|
alt {
|
|
[vc_state == NSVC_S_WAIT_RESET] as_wait_reset();
|
|
[vc_state == NSVC_S_ALIVE_BLOCKED] as_alive_blocked();
|
|
[vc_state == NSVC_S_ALIVE_UNBLOCKED] as_alive_unblocked();
|
|
[] as_allstate();
|
|
}
|
|
}
|
|
}
|
|
}
|