osmo-ttcn3-hacks/library/NS_Emulation.ttcnpp

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/* GPRS-NS Emulation in TTCN-3
* (C) 2018-2020 Harald Welte <laforge@gnumonks.org>
* contributions by sysmocom - s.f.m.c. GmbH
* 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
*/
module NS_Emulation {
import from Misc_Helpers all;
import from NS_Types all;
import from BSSGP_Types all;
import from Osmocom_Types all;
import from Osmocom_Gb_Types all;
import from NS_Provider_IPL4 all;
#ifdef NS_EMULATION_FR
import from NS_Provider_FR all;
#endif
import from IPL4asp_Types all;
type record NsUnitdataRequest {
BssgpBvci bvci,
Nsei nsei,
integer lsp,
octetstring sdu optional,
PDU_BSSGP bssgp optional
}
template NsUnitdataRequest tr_NsUdReq(template Nsei nsei, template BssgpBvci bvci, template integer lsp,
template octetstring sdu, template PDU_BSSGP bssgp) := {
bvci := bvci,
nsei := nsei,
lsp := lsp,
sdu := sdu,
bssgp := bssgp
}
template (value) NsUnitdataRequest ts_NsUdReq(template (value) Nsei nsei,
template (value) BssgpBvci bvci,
template (value) integer lsp,
template (omit) octetstring sdu,
template (omit) PDU_BSSGP bssgp) := {
bvci := bvci,
nsei := nsei,
lsp := lsp,
sdu := sdu,
bssgp := bssgp
}
type record NsUnitdataIndication {
BssgpBvci bvci,
Nsei nsei,
Nsvci nsvci,
octetstring sdu optional,
PDU_BSSGP bssgp optional
}
template (present) NsUnitdataIndication tr_NsUdInd(template (present) Nsei nsei,
template (present) BssgpBvci bvci,
template octetstring sdu) := {
bvci := bvci,
nsei := nsei,
nsvci := ?,
sdu := sdu,
bssgp := ?
}
template (value) NsUnitdataIndication ts_NsUdInd(Nsei nsei, Nsvci nsvci, BssgpBvci bvci, octetstring sdu) := {
bvci := bvci,
nsei := nsei,
nsvci := nsvci,
sdu := sdu,
bssgp := dec_PDU_BSSGP(sdu)
}
type record NsStatusIndication {
Nsei nsei,
Nsvci nsvci,
NsvcState old_state,
NsvcState new_state,
boolean first_or_last
}
template (present) NsStatusIndication tr_NsStsInd(template (present) Nsei nsei := ?,
template (present) Nsvci nsvci := ?,
template (present) NsvcState old_state := ?,
template (present) NsvcState state := ?,
template (present) boolean first_or_last := ?) := {
nsei := nsei,
nsvci := nsvci,
old_state := old_state,
new_state := state,
first_or_last := first_or_last
}
template (value) NsStatusIndication ts_NsStsInd(Nsei nsei, Nsvci nsvci, NsvcState old_state, NsvcState state,
boolean first_or_last := false) := {
nsei := nsei,
nsvci := nsvci,
old_state := old_state,
new_state := state,
first_or_last := first_or_last
}
type enumerated NsvcState {
NSVC_S_DEAD_BLOCKED,
NSVC_S_WAIT_RESET,
NSVC_S_ALIVE_BLOCKED,
NSVC_S_ALIVE_UNBLOCKED
}
/* port from our (internal) point of view */
type port NS_SP_PT message {
in NsUnitdataRequest;
out NsUnitdataIndication,
NsStatusIndication;
} with { extension "internal" };
/* port from the user point of view */
type port NS_PT message {
in ASP_Event,
NsStatusIndication,
NsUnitdataIndication;
out NsUnitdataRequest;
} with { extension "internal" };
type component NS_Provider_CT {
/* upper port, facing to NS_Emulation:NSCP */
port NS_PROVIDER_PT NSE;
/* lower layer ports (UDP/IP, Frame Relay) are added in derived components */
};
type enumerated NS_Provider_LinkStatus {
NS_PROV_LINK_STATUS_UP,
NS_PROV_LINK_STATUS_DOWN
};
type union NS_Provider_Evt {
NS_Provider_LinkStatus link_status
};
/* port between NS_Provider and NS_CT */
type port NS_PROVIDER_PT message {
inout PDU_NS, NS_Provider_Evt;
} with { extension "internal" };
type record NSVCConfigurationIP {
AddressFamily address_family,
PortNumber local_udp_port,
charstring local_ip,
PortNumber remote_udp_port,
charstring remote_ip
};
type record NSVCConfigurationFR {
charstring netdev, /* HDLC net-device for AF_PACKET socket */
integer dlci
};
type union NSVCConfigurationP {
NSVCConfigurationIP ip,
NSVCConfigurationFR fr
};
type record NSVCConfiguration {
NSVCConfigurationP provider,
Nsvci nsvci
};
type record of NSVCConfiguration NSVCConfigurations;
type record NSConfiguration {
Nsvci nsei,
boolean role_sgsn,
boolean handle_sns,
NSVCConfigurations nsvc
}
/***********************************************************************
* per NS-VCG component. Exists once per [peer of] NSE
***********************************************************************/
type component NS_CT {
/* NS-User SAP towards the user */
port NS_SP_PT NS_SP;
/* port towards the per-NSVC components */
port NS_PT NSVC;
/* all of the NS configuration a user passes to us */
var NSConfiguration g_config;
var charstring g_id;
/* references to the per-NSVC components */
var NsvcTable g_nsvcs := {};
/* list of indexes to g_nsvcs[] of currently unblocked NSVCs */
var ro_integer g_unblocked_nsvcs := {};
};
type record NsvcTableEntry {
Nsvci nsvci,
NSVC_CT vc_conn,
NsvcState state
};
type record of NsvcTableEntry NsvcTable;
type record of integer ro_integer;
/* add one NSVC (component and table entry */
function f_nsvc_add(NSVCConfiguration nsvc_cfg) runs on NS_CT {
var charstring nsvc_id := g_id & "-NSVCI" & int2str(nsvc_cfg.nsvci);
var NsvcTableEntry te;
te.nsvci := nsvc_cfg.nsvci;
te.vc_conn := NSVC_CT.create(nsvc_id);
te.state := NSVC_S_DEAD_BLOCKED;
connect(self:NSVC, te.vc_conn:NS_SP);
te.vc_conn.start(NSVCStart(nsvc_cfg, g_config, nsvc_id));
g_nsvcs := g_nsvcs & { te };
/* no need to add to g_unblocked_nsvcs, as state is always DEAD_BLOCKED above */
}
function f_nsvc_find_idx(Nsvci nsvci) runs on NS_CT return integer {
var integer i;
for (i := 0; i < lengthof(g_nsvcs); i := i+1) {
if (g_nsvcs[i].nsvci == nsvci) {
return i;
}
}
return -1;
}
function f_nsvc_find(Nsvci nsvci) runs on NS_CT return NSVC_CT {
var integer i := f_nsvc_find_idx(nsvci);
if (i < 0) {
return null;
} else {
return g_nsvcs[i].vc_conn;
}
}
function f_nsvc_update_state(Nsvci nsvci, NsvcState state) runs on NS_CT {
var integer i := f_nsvc_find_idx(nsvci);
if (i < 0) {
return;
}
if (g_nsvcs[i].state != NSVC_S_ALIVE_UNBLOCKED and state == NSVC_S_ALIVE_UNBLOCKED) {
/* add index to list of unblocked NSVCs */
g_unblocked_nsvcs := g_unblocked_nsvcs & {i};
} else if (g_nsvcs[i].state == NSVC_S_ALIVE_UNBLOCKED and state != NSVC_S_ALIVE_UNBLOCKED) {
/* remove index to list of unblocked NSVCs */
var ro_integer new_unblocked_nsvcs := {};
for (var integer j := 0; j < lengthof(g_unblocked_nsvcs); j := j+1) {
if (g_unblocked_nsvcs[j] != i) {
new_unblocked_nsvcs := new_unblocked_nsvcs & {j};
}
}
g_unblocked_nsvcs := new_unblocked_nsvcs;
}
g_nsvcs[i].state := state;
}
function NSStart(NSConfiguration init_config, charstring id := testcasename()) runs on NS_CT {
g_config := init_config;
g_id := id;
/* iterate over list of NS-VCs and start per-NSVC components */
for (var integer i := 0; i < lengthof(g_config.nsvc); i := i+1) {
var NSVCConfiguration nsvc_cfg := g_config.nsvc[i];
f_nsvc_add(nsvc_cfg);
}
while (true) {
alt {
[] as_ns_common() {}
}
}
}
function f_count_nsvcs_in_state(template NsvcState state := ?) runs on NS_CT return integer {
var integer i;
var integer res := 0;
for (i := 0; i < lengthof(g_nsvcs); i := i+1) {
if (match(g_nsvcs[i].state, state)) {
res := res + 1;
}
}
return res;
}
private altstep as_ns_common() runs on NS_CT {
var NsStatusIndication rx_nssi;
var NsUnitdataIndication rx_nsudi;
var NsUnitdataRequest rx_nsudr;
/* pass from NS-VCs up to user */
[] NSVC.receive(tr_NsStsInd(g_config.nsei, ?, ?, NSVC_S_ALIVE_UNBLOCKED)) -> value rx_nssi {
/* check if this one is the first to be unblocked */
var integer num_nsvc_unblocked := f_count_nsvcs_in_state(NSVC_S_ALIVE_UNBLOCKED);
f_nsvc_update_state(rx_nssi.nsvci, rx_nssi.new_state);
if (num_nsvc_unblocked == 0) {
rx_nssi.first_or_last := true;
}
NS_SP.send(rx_nssi);
}
[] NSVC.receive(tr_NsStsInd(g_config.nsei, ?, ?, NSVC_S_DEAD_BLOCKED)) -> value rx_nssi {
f_nsvc_update_state(rx_nssi.nsvci, rx_nssi.new_state);
/* check if this one is the last to be blocked */
var integer num_nsvc_unblocked := f_count_nsvcs_in_state(NSVC_S_ALIVE_UNBLOCKED);
if (num_nsvc_unblocked == 0) {
rx_nssi.first_or_last := true;
}
NS_SP.send(rx_nssi);
}
[] NSVC.receive(tr_NsStsInd(g_config.nsei, ?, ?, ?)) -> value rx_nssi {
f_nsvc_update_state(rx_nssi.nsvci, rx_nssi.new_state);
NS_SP.send(rx_nssi);
}
[] NSVC.receive(tr_NsStsInd) -> value rx_nssi {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
log2str("Received NsStatusInd for invalid NSEI: ", rx_nssi));
}
[] NSVC.receive(tr_NsUdInd(g_config.nsei, ?, ?)) -> value rx_nsudi {
NS_SP.send(rx_nsudi);
}
[] NSVC.receive(tr_NsUdInd(?, ?, ?)) -> value rx_nsudi {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
log2str("Received UnitDataInd for invalid NSEI: ", rx_nsudi));
}
/* from user down to NS-VC */
[] NS_SP.receive(tr_NsUdReq(g_config.nsei, ?, ?, ?, *)) -> value rx_nsudr {
/* load distribution function */
var integer nsvc_idx := g_unblocked_nsvcs[rx_nsudr.lsp mod lengthof(g_unblocked_nsvcs)];
NSVC.send(rx_nsudr) to g_nsvcs[nsvc_idx].vc_conn;
}
[] NS_SP.receive(tr_NsUdReq(?, ?, ?, ?, *)) -> value rx_nsudr {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
log2str("Received NsUnitdataReq for invalid NSEI: ", rx_nsudr));
}
}
/***********************************************************************
per-NSVC component. Exists once for each NS-VC in the NS-VCG
***********************************************************************/
type component NSVC_CT {
/* UDP port towards the bottom (IUT) */
port NS_PROVIDER_PT NSCP;
var NS_Provider_IPL4_CT vc_NSP_IP;
#ifdef NS_EMULATION_FR
var NS_Provider_FR_CT vc_NSP_FR;
#endif
/* port towards the NS_CT */
port NS_SP_PT NS_SP;
/* configuration passed by the user */
var NSVCConfiguration g_nsvc_config;
/* we cannot access the NS_CT.config and hence need to copy those */
var NSConfiguration g_config;
var NsvcState vc_state := NSVC_S_DEAD_BLOCKED;
timer Tns_alive := 3.0;
timer Tns_test := 10.0;
timer Tns_block := 10.0;
timer Tns_reset := 10.0;
}
function NSVCStart(NSVCConfiguration init_config, NSConfiguration init_g_config, charstring id := testcasename()) runs on NSVC_CT {
g_nsvc_config := init_config;
g_config := init_g_config;
f_init(id & "-NSVCemu" & int2str(g_nsvc_config.nsvci));
f_ScanEvents();
}
private function f_init(charstring id) runs on NSVC_CT {
var Result res;
if (ischosen(g_nsvc_config.provider.ip)) {
/* Connect the UDP socket */
vc_NSP_IP := NS_Provider_IPL4_CT.create(id & "-provIP");
connect(self:NSCP, vc_NSP_IP:NSE);
vc_NSP_IP.start(NS_Provider_IPL4.main(g_nsvc_config, g_config, id));
#ifdef NS_EMULATION_FR
} else if (ischosen(g_nsvc_config.provider.fr)) {
vc_NSP_FR := NS_Provider_FR_CT.create(id & "-provFR");
connect(self:NSCP, vc_NSP_FR:NSE);
vc_NSP_FR.start(NS_Provider_FR.main(g_nsvc_config, g_config, id));
#endif
} else {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Unsupported NS provider");
}
f_change_state(NSVC_S_DEAD_BLOCKED);
}
private function f_change_state(NsvcState new_state) runs on NSVC_CT {
var NsvcState old_state := vc_state;
vc_state := new_state;
log("NSVC ", g_nsvc_config.nsvci, " State Transition: ", old_state, " -> ", new_state);
NS_SP.send(ts_NsStsInd(g_config.nsei, g_nsvc_config.nsvci, old_state, new_state));
}
private function f_sendReset() runs on NSVC_CT {
NSCP.send(ts_NS_RESET(NS_CAUSE_OM_INTERVENTION, g_nsvc_config.nsvci, g_config.nsei));
Tns_reset.start;
vc_state := NSVC_S_WAIT_RESET;
}
private function f_sendAlive() runs on NSVC_CT {
NSCP.send(t_NS_ALIVE);
Tns_alive.start;
}
private function f_sendUnblock() runs on NSVC_CT {
NSCP.send(t_NS_UNBLOCK);
Tns_block.start;
}
private function f_sendBlock(NsCause cause) runs on NSVC_CT {
NSCP.send(ts_NS_BLOCK(cause, g_nsvc_config.nsvci));
Tns_block.start;
}
private altstep as_allstate() runs on NSVC_CT {
var PDU_NS rf;
var ASP_Event evt;
/* transition to DEAD if t_alive times out */
[] Tns_alive.timeout {
log("Tns-alive expired: changing to DEAD_BLOCKED + starting Tns-test");
f_change_state(NSVC_S_DEAD_BLOCKED);
Tns_test.start;
}
[] Tns_test.timeout {
log("Tns-test expired: sending NS-ALIVE");
f_sendAlive();
}
/* Stop t_alive when receiving ALIVE-ACK */
[Tns_alive.running] NSCP.receive(t_NS_ALIVE_ACK) {
log("Rx NS-ALIVE-ACK: stopping Tns-alive; starting Tns-test");
Tns_alive.stop;
Tns_test.start;
}
/* respond to NS-ALIVE with NS-ALIVE-ACK */
[] NSCP.receive(t_NS_ALIVE) {
NSCP.send(t_NS_ALIVE_ACK);
}
/* Respond to BLOCK for wrong NSVCI */
[] NSCP.receive(tr_NS_BLOCK(?, ?)) -> value rf {
log("Rx NS-BLOCK for unknown NSVCI");
/* FIXME */
}
[not g_config.handle_sns] as_handle_reset();
[g_config.role_sgsn and g_config.handle_sns and ischosen(g_nsvc_config.provider.ip)] as_sns_sgsn();
/* default case of handling unknown PDUs */
[] 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();
}
}
}
}