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srsRAN/srsue/test/ttcn3/hdr/ttcn3_syssim.h

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/*
* Copyright 2013-2020 Software Radio Systems Limited
*
* This file is part of srsLTE.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#ifndef SRSUE_TTCN3_SYSSIM_H
#define SRSUE_TTCN3_SYSSIM_H
#include "dut_utils.h"
#include "srslte/common/pdu_queue.h"
#include "srslte/upper/pdcp.h"
#include "srslte/upper/rlc.h"
#include "ttcn3_common.h"
#include "ttcn3_ip_ctrl_interface.h"
#include "ttcn3_ip_sock_interface.h"
#include "ttcn3_srb_interface.h"
#include "ttcn3_sys_interface.h"
#include "ttcn3_ue.h"
#include "ttcn3_ut_interface.h"
#include <functional>
#include <srslte/interfaces/ue_interfaces.h>
#define TTCN3_CRNTI (0x1001)
class ttcn3_syssim : public syssim_interface_phy,
public ss_ut_interface,
public ss_sys_interface,
public ss_srb_interface,
public rrc_interface_rlc,
public rlc_interface_pdcp,
public rrc_interface_pdcp,
public srslte::pdu_queue::process_callback
{
public:
ttcn3_syssim(srslte::logger_file* logger_file_, ttcn3_ue* ue_) :
log{"SS "},
ss_mac_log{"SS-MAC"},
mac_msg_ul(20, ss_mac_log),
mac_msg_dl(20, ss_mac_log),
timers(8),
pdus(128),
logger(logger_file_),
logger_file(logger_file_),
pool(byte_buffer_pool::get_instance()),
ue(ue_),
rlc(&ss_rlc_log),
signal_handler(&running),
timer_handler(create_tti_timer(), [&](uint64_t res) { new_tti_indication(res); }),
pdcp(&timers, &ss_pdcp_log)
{
if (ue->init(all_args_t{}, logger, this, "INIT_TEST") != SRSLTE_SUCCESS) {
ue->stop();
fprintf(stderr, "Couldn't initialize UE.\n");
}
}
~ttcn3_syssim(){};
int init(const all_args_t& args_)
{
args = args_;
// Make sure to get SS logging as well
if (args.log.filename == "stdout") {
logger = &logger_stdout;
}
// init and configure logging
srslte::logmap::register_log(std::unique_ptr<srslte::log>{new log_filter{"SS ", logger, true}});
ut_log.init("UT ", logger);
sys_log.init("SYS ", logger);
ip_sock_log.init("IP_S", logger);
ip_ctrl_log.init("IP_C", logger);
srb_log.init("SRB ", logger);
ss_rlc_log.init("SS-RLC", logger);
ss_pdcp_log.init("SS-PDCP", logger);
log->set_level(args.log.all_level);
ut_log.set_level(args.log.all_level);
sys_log.set_level(args.log.all_level);
ip_sock_log.set_level(args.log.all_level);
ip_ctrl_log.set_level(args.log.all_level);
srb_log.set_level(args.log.all_level);
ss_mac_log->set_level(args.log.all_level);
ss_rlc_log.set_level(args.log.all_level);
ss_pdcp_log.set_level(args.log.all_level);
log->set_hex_limit(args.log.all_hex_limit);
ut_log.set_hex_limit(args.log.all_hex_limit);
sys_log.set_hex_limit(args.log.all_hex_limit);
ip_sock_log.set_hex_limit(args.log.all_hex_limit);
ip_ctrl_log.set_hex_limit(args.log.all_hex_limit);
srb_log.set_hex_limit(args.log.all_hex_limit);
ss_mac_log->set_hex_limit(args.log.all_hex_limit);
ss_rlc_log.set_hex_limit(args.log.all_hex_limit);
ss_pdcp_log.set_hex_limit(args.log.all_hex_limit);
// Init epoll socket and add FDs
epoll_fd = epoll_create1(0);
if (epoll_fd == -1) {
log->error("Error creating epoll\n");
return SRSLTE_ERROR;
}
// add signalfd
signal_fd = add_signalfd();
if (add_epoll(signal_fd, epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding signalfd to epoll\n");
return SRSLTE_ERROR;
}
event_handler.insert({signal_fd, &signal_handler});
// init system interfaces to tester
if (add_port_handler() != SRSLTE_SUCCESS) {
log->error("Error creating port handlers\n");
return SRSLTE_ERROR;
}
// Init SS layers
pdus.init(this, log);
rlc.init(&pdcp, this, &timers, 0 /* RB_ID_SRB0 */);
pdcp.init(&rlc, this, nullptr);
return SRSLTE_SUCCESS;
}
void set_forced_lcid(int lcid) { force_lcid = lcid; }
int add_port_handler()
{
// UT port
int ut_fd = ut.init(this, &ut_log, listen_address, UT_PORT);
if (add_epoll(ut_fd, epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding UT port to epoll\n");
return SRSLTE_ERROR;
}
event_handler.insert({ut_fd, &ut});
log->console("UT handler listening on SCTP port %d\n", UT_PORT);
// SYS port
int sys_fd = sys.init(this, &sys_log, listen_address, SYS_PORT);
if (add_epoll(sys_fd, epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding SYS port to epoll\n");
return SRSLTE_ERROR;
}
event_handler.insert({sys_fd, &sys});
log->console("SYS handler listening on SCTP port %d\n", SYS_PORT);
// IPsock port
int ip_sock_fd = ip_sock.init(&ip_sock_log, listen_address, IPSOCK_PORT);
if (add_epoll(ip_sock_fd, epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding IP sock port to epoll\n");
return SRSLTE_ERROR;
}
event_handler.insert({ip_sock_fd, &ip_sock});
log->console("IPSOCK handler listening on SCTP port %d\n", IPSOCK_PORT);
// IPctrl port
int ip_ctrl_fd = ip_ctrl.init(&ip_ctrl_log, listen_address, IPCTRL_PORT);
if (add_epoll(ip_ctrl_fd, epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding IP ctrl port to epoll\n");
return SRSLTE_ERROR;
}
event_handler.insert({ip_ctrl_fd, &ip_ctrl});
log->console("IPCTRL handler listening on SCTP port %d\n", IPCTRL_PORT);
// add SRB fd
int srb_fd = srb.init(this, &srb_log, listen_address, SRB_PORT);
if (add_epoll(srb_fd, epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding SRB port to epoll\n");
return SRSLTE_ERROR;
}
event_handler.insert({srb_fd, &srb});
log->console("SRB handler listening on SCTP port %d\n", SRB_PORT);
return SRSLTE_SUCCESS;
}
///< Function called by epoll timer handler when TTI timer expires
void new_tti_indication(uint64_t res)
{
tti = (tti + 1) % 10240;
log->step(tti);
log->debug("Start TTI\n");
ue->set_current_tti(tti);
// check scheduled actions for this TTI
if (tti_actions.find(tti) != tti_actions.end()) {
while (!tti_actions[tti].empty()) {
log->debug("Running scheduled action\n");
move_task_t task = std::move(tti_actions[tti].back());
task();
tti_actions[tti].pop_back();
}
}
// trying to apply pending PDCP config
if (not pending_bearer_config.empty()) {
log->debug("Trying to apply pending PDCP config\n");
pending_bearer_config = try_set_pdcp_security(pending_bearer_config);
}
// process events, if any
while (not event_queue.empty()) {
ss_events_t ev = event_queue.wait_pop();
switch (ev) {
case UE_SWITCH_ON:
log->console("Switching on UE ID=%d\n", run_id);
ue->switch_on();
break;
case UE_SWITCH_OFF:
log->console("Switching off UE ID=%d\n", run_id);
ue->switch_off();
break;
case ENABLE_DATA:
log->console("Enabling data for UE ID=%d\n", run_id);
ue->enable_data();
break;
case DISABLE_DATA:
log->console("Disabling data for UE ID=%d\n", run_id);
ue->disable_data();
break;
}
}
if (pcell_idx == -1) {
log->debug("Skipping TTI. Pcell not yet selected.\n");
return;
}
// DL/UL processing if UE has selected cell
dl_rnti = ue->get_dl_sched_rnti(tti);
if (SRSLTE_RNTI_ISSI(dl_rnti)) {
// deliver SIBs one after another
mac_interface_phy_lte::mac_grant_dl_t dl_grant = {};
dl_grant.pid = get_pid(tti);
dl_grant.rnti = dl_rnti;
dl_grant.tb[0].tbs = cells[pcell_idx]->sibs[cells[pcell_idx]->sib_idx]->N_bytes;
dl_grant.tb[0].ndi = get_ndi_for_new_dl_tx(tti);
ue->new_tb(dl_grant, cells[pcell_idx]->sibs[cells[pcell_idx]->sib_idx]->msg);
log->info("Delivered SIB%d for pcell_idx=%d\n", cells[pcell_idx]->sib_idx, pcell_idx);
cells[pcell_idx]->sib_idx = (cells[pcell_idx]->sib_idx + 1) % cells[pcell_idx]->sibs.size();
} else if (SRSLTE_RNTI_ISRAR(dl_rnti)) {
if (prach_tti != -1) {
rar_tti = (prach_tti + 3) % 10240;
if (tti == rar_tti) {
send_rar(prach_preamble_index);
}
}
} else if (SRSLTE_RNTI_ISPA(dl_rnti)) {
log->debug("Searching for paging RNTI\n");
// PCH will be triggered from SYSSIM after receiving Paging
} else if (SRSLTE_RNTI_ISUSER(dl_rnti)) {
// check if this is for contention resolution after PRACH/RAR
if (dl_rnti == crnti) {
log->debug("Searching for C-RNTI=%d\n", crnti);
if (rar_tti != -1) {
msg3_tti = (rar_tti + 3) % 10240;
if (tti == msg3_tti) {
send_msg3_grant();
rar_tti = -1;
}
}
}
// check for SR
if (sr_tti != -1) {
send_sr_ul_grant();
}
if (dl_rnti != SRSLTE_INVALID_RNTI) {
log->debug("Searching for RNTI=%d\n", dl_rnti);
// look for DL data to be send in each bearer and provide grant accordingly
for (int lcid = 0; lcid < SRSLTE_N_RADIO_BEARERS; lcid++) {
uint32_t buf_state = rlc.get_buffer_state(lcid);
// Schedule DL transmission if there is data in RLC buffer or we need to send Msg4
if ((buf_state > 0 && bearer_follow_on_map[lcid] == false) || (msg3_tti != -1 && conres_id != 0)) {
log->debug("LCID=%d, buffer_state=%d\n", lcid, buf_state);
tx_payload_buffer.clear();
const uint32_t mac_header_size = 10; // Add MAC header (10 B for all subheaders, etc)
mac_msg_dl.init_tx(&tx_payload_buffer, buf_state + mac_header_size, false);
// check if this is Msg4 that needs to contain the contention resolution ID CE
if (msg3_tti != -1 && lcid == 0 && conres_id != 0) {
if (mac_msg_dl.new_subh()) {
if (mac_msg_dl.get()->set_con_res_id(conres_id)) {
log->info("CE: Added Contention Resolution ID=0x%" PRIx64 "\n", conres_id);
} else {
log->error("CE: Setting Contention Resolution ID CE\n");
}
conres_id = 0; // reset CR so it's not sent twice
} else {
log->error("CE: Setting Contention Resolution ID CE. No space for a subheader\n");
}
msg3_tti = -1;
}
bool has_single_sdu = false;
// allocate SDUs
while (buf_state > 0) { // there is pending SDU to allocate
if (mac_msg_dl.new_subh()) {
int n = mac_msg_dl.get()->set_sdu(lcid, buf_state, &rlc);
if (n == -1) {
log->error("Error while adding SDU (%d B) to MAC PDU\n", buf_state);
mac_msg_dl.del_subh();
}
// update buffer state
buf_state = rlc.get_buffer_state(lcid);
if (mac_msg_dl.nof_subh() == 1) {
has_single_sdu = true;
} else {
has_single_sdu = false;
}
}
}
// Assemble entire MAC PDU
uint8_t* mac_pdu_ptr = mac_msg_dl.write_packet(log);
if (mac_pdu_ptr != nullptr) {
if (force_lcid != -1 && lcid == 0) {
if (has_single_sdu) {
log->info("Patched lcid in mac header to: %d\n", force_lcid);
mac_pdu_ptr[0] = (mac_pdu_ptr[0] & 0xe0) | (force_lcid & 0x1f);
} else if (mac_msg_dl.nof_subh() > 1) {
log->warning(
"Not patching lcid to %d in mac header (nof_subh == %d)\n", force_lcid, mac_msg_dl.nof_subh());
}
}
log->info_hex(mac_pdu_ptr, mac_msg_dl.get_pdu_len(), "DL MAC PDU (%d B):\n", mac_msg_dl.get_pdu_len());
// Prepare MAC grant for CCCH
mac_interface_phy_lte::mac_grant_dl_t dl_grant = {};
dl_grant.pid = get_pid(tti);
dl_grant.rnti = dl_rnti;
dl_grant.tb[0].tbs = mac_msg_dl.get_pdu_len();
dl_grant.tb[0].ndi_present = true;
dl_grant.tb[0].ndi = get_ndi_for_new_dl_tx(tti);
ue->new_tb(dl_grant, (const uint8_t*)mac_pdu_ptr);
} else {
log->error("Error writing DL MAC PDU\n");
}
mac_msg_dl.reset();
} else if (bearer_follow_on_map[lcid]) {
log->info("Waiting for more PDUs for transmission on LCID=%d\n", lcid);
}
}
// Check if we need to provide a UL grant as well
}
} else {
log->debug("Not handling RNTI=%d\n", dl_rnti);
}
}
void stop()
{
running = false;
ue->stop();
}
// Internal function called with acquired lock
void reset()
{
rlc.reset();
pdcp.reset();
cells.clear();
pcell_idx = -1;
pending_bearer_config.clear();
}
// Called from UT before starting testcase
void tc_start(const char* name)
{
// strip testsuite name
std::string tc_name = get_tc_name(name);
// Make a copy of the UE args for this run
all_args_t local_args = args;
// set up logging
if (args.log.filename == "stdout") {
logger = &logger_stdout;
} else {
logger_file->init(get_filename_with_tc_name(local_args.log.filename, run_id, tc_name).c_str(), -1);
logger = logger_file;
}
log->info("Initializing UE ID=%d for TC=%s\n", run_id, tc_name.c_str());
log->console("Initializing UE ID=%d for TC=%s\n", run_id, tc_name.c_str());
// Patch UE config
local_args.stack.pcap.filename = get_filename_with_tc_name(args.stack.pcap.filename, run_id, tc_name);
local_args.stack.pcap.nas_filename = get_filename_with_tc_name(args.stack.pcap.nas_filename, run_id, tc_name);
// bring up UE
if (ue->init(local_args, logger, this, tc_name)) {
ue->stop();
std::string err("Couldn't initialize UE.\n");
log->error("%s\n", err.c_str());
log->console("%s\n", err.c_str());
return;
}
// create and add TTI timer to epoll
if (add_epoll(timer_handler.get_timer_fd(), epoll_fd) != SRSLTE_SUCCESS) {
log->error("Error while adding TTI timer to epoll\n");
}
event_handler.insert({timer_handler.get_timer_fd(), &timer_handler});
}
// Called from UT to terminate the testcase
void tc_end()
{
log->info("Deinitializing UE ID=%d\n", run_id);
log->console("Deinitializing UE ID=%d\n", run_id);
ue->stop();
// stop TTI timer
del_epoll(timer_handler.get_timer_fd(), epoll_fd);
logger_file->stop();
run_id++;
// Reset SS' RLC and PDCP
reset();
}
void power_off_ue()
{
// only return after new UE instance is up and running
}
// Called from outside
void switch_on_ue() { event_queue.push(UE_SWITCH_ON); }
void switch_off_ue() { event_queue.push(UE_SWITCH_OFF); }
void enable_data() { event_queue.push(ENABLE_DATA); }
void disable_data() { event_queue.push(DISABLE_DATA); }
// Called from PHY but always from the SS main thread with lock being hold
void prach_indication(uint32_t preamble_index_, const uint32_t& cell_id)
{
// verify that UE intends to send PRACH on current Pcell
if (cells[pcell_idx]->cell.id != cell_id) {
log->error("UE is attempting to PRACH on pci=%d, current Pcell=%d\n", cell_id, cells[pcell_idx]->cell.id);
return;
}
// store TTI for providing UL grant for Msg3 transmission
prach_tti = tti;
prach_preamble_index = preamble_index_;
}
// Called from PHY
void sr_req(uint32_t tti_tx)
{
log->info("Received SR from PHY\n");
sr_tti = tti_tx;
}
// Called from PHY
void tx_pdu(const uint8_t* payload, const int len, const uint32_t tx_tti)
{
if (payload == NULL) {
ss_mac_log->error("Received NULL as PDU payload. Dropping.\n");
return;
}
log->debug_hex(payload, len, "Received MAC PDU (%d B)\n", len);
// Parse MAC
mac_msg_ul.init_rx(len, true);
mac_msg_ul.parse_packet((uint8_t*)payload);
while (mac_msg_ul.next()) {
assert(mac_msg_ul.get());
if (mac_msg_ul.get()->is_sdu()) {
// Push PDU to our own RLC (needed to handle status reporting, etc. correctly
ss_mac_log->info_hex(mac_msg_ul.get()->get_sdu_ptr(),
mac_msg_ul.get()->get_payload_size(),
"Route PDU to LCID=%d (%d B)\n",
mac_msg_ul.get()->get_sdu_lcid(),
mac_msg_ul.get()->get_payload_size());
rlc.write_pdu(
mac_msg_ul.get()->get_sdu_lcid(), mac_msg_ul.get()->get_sdu_ptr(), mac_msg_ul.get()->get_payload_size());
// Save contention resolution if lcid == 0
if (mac_msg_ul.get()->get_sdu_lcid() == 0) {
int nbytes = srslte::sch_subh::MAC_CE_CONTRES_LEN;
if (mac_msg_ul.get()->get_payload_size() >= (uint32_t)nbytes) {
uint8_t* ue_cri_ptr = (uint8_t*)&conres_id;
uint8_t* pkt_ptr = mac_msg_ul.get()->get_sdu_ptr(); // Warning here: we want to include the
for (int i = 0; i < nbytes; i++) {
ue_cri_ptr[nbytes - i - 1] = pkt_ptr[i];
}
ss_mac_log->info_hex(ue_cri_ptr, nbytes, "Contention resolution ID:\n");
} else {
ss_mac_log->error("Received CCCH UL message of invalid size=%d bytes\n",
mac_msg_ul.get()->get_payload_size());
}
}
}
}
mac_msg_ul.reset();
// Process CE after all SDUs because we need to update BSR after
bool bsr_received = false;
while (mac_msg_ul.next()) {
assert(mac_msg_ul.get());
if (!mac_msg_ul.get()->is_sdu()) {
// Process MAC Control Element
bsr_received |= process_ce(mac_msg_ul.get());
}
}
}
// Internal function called from main thread
void send_rar(uint32_t preamble_index)
{
log->info("Sending RAR for RAPID=%d\n", preamble_index);
// Prepare RAR grant
uint8_t grant_buffer[64] = {};
srslte_dci_rar_grant_t rar_grant = {};
rar_grant.tpc_pusch = 3;
srslte_dci_rar_pack(&rar_grant, grant_buffer);
// Create MAC PDU and add RAR subheader
srslte::rar_pdu rar_pdu;
rar_buffer.clear();
const int rar_pdu_len = 64;
rar_pdu.init_tx(&rar_buffer, rar_pdu_len);
rar_pdu.set_backoff(11); // Backoff of 480ms to prevent UE from PRACHing too fast
if (rar_pdu.new_subh()) {
rar_pdu.get()->set_rapid(preamble_index);
rar_pdu.get()->set_ta_cmd(0);
rar_pdu.get()->set_temp_crnti(crnti);
rar_pdu.get()->set_sched_grant(grant_buffer);
}
rar_pdu.write_packet(rar_buffer.msg);
rar_buffer.N_bytes = rar_pdu_len;
// Prepare grant and pass all to MAC
mac_interface_phy_lte::mac_grant_dl_t dl_grant = {};
dl_grant.pid = get_pid(tti);
dl_grant.rnti = 0x1; // must be a valid RAR-RNTI
dl_grant.tb[0].tbs = rar_buffer.N_bytes;
dl_grant.tb[0].ndi = get_ndi_for_new_dl_tx(tti);
// send grant and pass payload to TB data (grant contains length)
ue->new_tb(dl_grant, rar_buffer.msg);
// reset last PRACH transmission tti
prach_tti = -1;
}
// Internal function called from main thread
void send_msg3_grant()
{
log->info("Sending Msg3 grant for C-RNTI=%d\n", crnti);
mac_interface_phy_lte::mac_grant_ul_t ul_grant = {};
ul_grant.tb.tbs = 32;
ul_grant.tb.ndi_present = true;
ul_grant.tb.ndi = get_ndi_for_new_ul_tx(tti);
ul_grant.rnti = crnti;
ul_grant.pid = get_pid(tti);
ul_grant.is_rar = true;
ue->new_grant_ul(ul_grant);
}
// Internal function called from main thread
void send_sr_ul_grant()
{
// Provide new UL grant to UE
mac_interface_phy_lte::mac_grant_ul_t ul_grant = {};
ul_grant.tb.tbs = 100; // TODO: reasonable size?
ul_grant.tb.ndi_present = true;
ul_grant.tb.ndi = get_ndi_for_new_ul_tx(tti);
ul_grant.rnti = crnti;
ul_grant.pid = get_pid(tti);
ue->new_grant_ul(ul_grant);
sr_tti = -1;
}
// internal function called from tx_pdu (called from main thread)
bool process_ce(srslte::sch_subh* subh)
{
uint16_t rnti = dl_rnti;
uint32_t buff_size[4] = {0, 0, 0, 0};
float phr = 0;
int32_t idx = 0;
uint16_t old_rnti = 0;
bool is_bsr = false;
switch (subh->ce_type()) {
case srslte::sch_subh::PHR_REPORT:
phr = subh->get_phr();
ss_mac_log->info("CE: Received PHR from rnti=0x%x, value=%.0f\n", rnti, phr);
break;
case srslte::sch_subh::CRNTI:
old_rnti = subh->get_c_rnti();
ss_mac_log->info("CE: Received C-RNTI from temp_rnti=0x%x, rnti=0x%x\n", rnti, old_rnti);
break;
case srslte::sch_subh::TRUNC_BSR:
case srslte::sch_subh::SHORT_BSR:
idx = subh->get_bsr(buff_size);
if (idx == -1) {
ss_mac_log->error("Invalid Index Passed to lc groups\n");
break;
}
ss_mac_log->info("CE: Received %s BSR rnti=0x%x, lcg=%d, value=%d\n",
subh->ce_type() == srslte::sch_subh::SHORT_BSR ? "Short" : "Trunc",
rnti,
idx,
buff_size[idx]);
is_bsr = true;
break;
case srslte::sch_subh::LONG_BSR:
subh->get_bsr(buff_size);
is_bsr = true;
ss_mac_log->info("CE: Received Long BSR rnti=0x%x, value=%d,%d,%d,%d\n",
rnti,
buff_size[0],
buff_size[1],
buff_size[2],
buff_size[3]);
break;
case srslte::sch_subh::PADDING:
ss_mac_log->debug("CE: Received padding for rnti=0x%x\n", rnti);
break;
default:
ss_mac_log->error("CE: Invalid lcid=0x%x\n", subh->ce_type());
break;
}
return is_bsr;
}
uint32_t get_pid(const uint32_t tti_) { return tti_ % SRSLTE_FDD_NOF_HARQ; }
bool get_ndi_for_new_ul_tx(const uint32_t tti_)
{
// toggle NDI to always create new Tx
const uint32_t pid = get_pid(tti_);
last_ul_ndi[pid] = !last_ul_ndi[pid];
log->info("UL-PID=%d NDI=%s\n", pid, last_ul_ndi[pid] ? "1" : "0");
return last_ul_ndi[pid];
}
bool get_ndi_for_new_dl_tx(const uint32_t tti_)
{
// toggle NDI to always create new Tx
const uint32_t pid = get_pid(tti_);
last_dl_ndi[pid] = !last_dl_ndi[pid];
log->info("DL-PID=%d NDI=%s\n", pid, last_dl_ndi[pid] ? "1" : "0");
return last_dl_ndi[pid];
}
int run()
{
running = true;
while (running) {
// wait for event
const int32_t epoll_timeout_ms = -1;
const uint32_t MAX_EVENTS = 1;
struct epoll_event events[MAX_EVENTS] = {};
int nof_events = epoll_wait(epoll_fd, events, MAX_EVENTS, epoll_timeout_ms);
// handle event
if (nof_events == -1) {
perror("epoll_wait() error");
break;
}
if (nof_events == 0) {
printf("time out %f sec expired\n", epoll_timeout_ms / 1000.0);
continue;
}
for (int i = 0; i < nof_events; ++i) {
if ((events[i].events & EPOLLERR) || (events[i].events & EPOLLHUP) || (!(events[i].events & EPOLLIN))) {
///< An error has occured on this fd, or the socket is not ready for reading
fprintf(stderr, "epoll error\n");
close(events[i].data.fd);
continue;
}
int fd = events[i].data.fd;
if (event_handler.find(fd) != event_handler.end()) {
event_handler[fd]->handle_event(fd, events[i], epoll_fd);
}
}
}
return SRSLTE_SUCCESS;
}
uint32_t get_tti() { return tti; }
void process_pdu(uint8_t* buff, uint32_t len, pdu_queue::channel_t channel) {}
void set_cell_config(const ttcn3_helpers::timing_info_t timing,
const std::string cell_name,
const uint32_t earfcn,
const srslte_cell_t cell,
const float power)
{
if (timing.now) {
set_cell_config_impl(cell_name, earfcn, cell, power);
} else {
log->debug("Scheduling Cell configuration of %s for TTI=%d\n", cell_name.c_str(), timing.tti);
tti_actions[timing.tti].push_back(
[this, cell_name, earfcn, cell, power]() { set_cell_config_impl(cell_name, earfcn, cell, power); });
}
}
void set_cell_config_impl(const std::string cell_name_,
const uint32_t earfcn_,
const srslte_cell_t cell_,
const float power_)
{
// check if cell already exists
if (not syssim_has_cell(cell_name_)) {
// insert new cell
log->info("Adding cell %s with cellId=%d and power=%.2f dBm\n", cell_name_.c_str(), cell_.id, power_);
unique_syssim_cell_t cell = unique_syssim_cell_t(new syssim_cell_t);
cell->name = cell_name_;
cell->cell = cell_;
cell->initial_power = power_;
cell->earfcn = earfcn_;
cells.push_back(std::move(cell));
} else {
// cell is already there
log->info("Cell already there, reconfigure\n");
}
update_cell_map();
}
// internal function
bool syssim_has_cell(std::string cell_name)
{
for (auto& cell : cells) {
if (cell->name == cell_name) {
return true;
}
}
return false;
}
void set_cell_attenuation(const ttcn3_helpers::timing_info_t timing, const std::string cell_name, const float value)
{
if (timing.now) {
set_cell_attenuation_impl(cell_name, value);
} else {
log->debug("Scheduling Cell attenuation reconfiguration of %s for TTI=%d\n", cell_name.c_str(), timing.tti);
tti_actions[timing.tti].push_back([this, cell_name, value]() { set_cell_attenuation_impl(cell_name, value); });
}
}
void set_cell_attenuation_impl(const std::string cell_name, const float value)
{
if (not syssim_has_cell(cell_name)) {
log->error("Can't set cell power. Cell not found.\n");
}
// update cell's power
for (auto& cell : cells) {
if (cell->name == cell_name) {
cell->attenuation = value;
break;
}
}
update_cell_map();
}
// Internal function
void update_cell_map()
{
// convert syssim cell list to phy cell list
{
lte_ttcn3_phy::cell_list_t phy_cells;
for (auto& ss_cell : cells) {
lte_ttcn3_phy::cell_t phy_cell = {};
phy_cell.info = ss_cell->cell;
phy_cell.power = ss_cell->initial_power - ss_cell->attenuation;
phy_cell.earfcn = ss_cell->earfcn;
log->info("Configuring cell with PCI=%d with TxPower=%.2f\n", phy_cell.info.id, phy_cell.power);
phy_cells.push_back(phy_cell);
}
// SYSSIM defines what cells the UE can connect to
ue->set_cell_map(phy_cells);
}
}
bool have_valid_pcell() { return (pcell_idx >= 0 && pcell_idx < static_cast<int>(cells.size())); }
void add_bcch_dlsch_pdu(const string cell_name, unique_byte_buffer_t pdu)
{
if (not syssim_has_cell(cell_name)) {
log->error("Can't add BCCH to cell. Cell not found.\n");
}
// add SIB
for (auto& cell : cells) {
if (cell->name == cell_name) {
cell->sibs.push_back(std::move(pdu));
break;
}
}
}
void add_ccch_pdu(const ttcn3_helpers::timing_info_t timing, unique_byte_buffer_t pdu)
{
if (timing.now) {
// Add to SRB0 Tx queue
rlc.write_sdu(0, std::move(pdu));
} else {
log->debug("Scheduling CCCH PDU for TTI=%d\n", timing.tti);
auto task = [this](srslte::unique_byte_buffer_t& pdu) { rlc.write_sdu(0, std::move(pdu)); };
tti_actions[timing.tti].push_back(std::bind(task, std::move(pdu)));
}
}
void
add_dcch_pdu(const ttcn3_helpers::timing_info_t timing, uint32_t lcid, unique_byte_buffer_t pdu, bool follow_on_flag)
{
if (timing.now) {
add_dcch_pdu_impl(lcid, std::move(pdu), follow_on_flag);
} else {
log->debug("Scheduling DCCH PDU for TTI=%d\n", timing.tti);
auto task = [this](uint32_t lcid, srslte::unique_byte_buffer_t& pdu, bool follow_on_flag) {
add_dcch_pdu_impl(lcid, std::move(pdu), follow_on_flag);
};
tti_actions[timing.tti].push_back(std::bind(task, lcid, std::move(pdu), follow_on_flag));
}
}
void add_dcch_pdu_impl(uint32_t lcid, unique_byte_buffer_t pdu, bool follow_on_flag)
{
// push to PDCP and create DL grant for it
log->info("Writing PDU (%d B) to LCID=%d\n", pdu->N_bytes, lcid);
pdcp.write_sdu(lcid, std::move(pdu), true);
bearer_follow_on_map[lcid] = follow_on_flag;
}
void add_pch_pdu(unique_byte_buffer_t pdu)
{
log->info("Received PCH PDU (%d B)\n", pdu->N_bytes);
// Prepare MAC grant for PCH
mac_interface_phy_lte::mac_grant_dl_t dl_grant = {};
dl_grant.pid = get_pid(tti);
dl_grant.rnti = SRSLTE_PRNTI;
dl_grant.tb[0].tbs = pdu->N_bytes;
dl_grant.tb[0].ndi_present = true;
dl_grant.tb[0].ndi = get_ndi_for_new_dl_tx(tti);
ue->new_tb(dl_grant, (const uint8_t*)pdu->msg);
}
void step_timer() { timers.step_all(); }
void add_srb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid, const pdcp_config_t pdcp_config)
{
if (timing.now) {
add_srb_impl(lcid, pdcp_config);
} else {
log->debug("Scheduling SRB%d addition for TTI=%d\n", lcid, timing.tti);
tti_actions[timing.tti].push_back([this, lcid, pdcp_config]() { add_srb_impl(lcid, pdcp_config); });
}
}
void add_srb_impl(const uint32_t lcid, const pdcp_config_t pdcp_config)
{
log->info("Adding SRB%d\n", lcid);
pdcp.add_bearer(lcid, pdcp_config);
rlc.add_bearer(lcid, srslte::rlc_config_t::srb_config(lcid));
}
void reestablish_bearer(uint32_t lcid)
{
log->info("Reestablishing LCID=%d\n", lcid);
pdcp.reestablish(lcid);
rlc.reestablish(lcid);
}
void del_srb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid)
{
if (timing.now) {
del_srb_impl(lcid);
} else {
log->debug("Scheduling SRB%d deletion for TTI=%d\n", lcid, timing.tti);
tti_actions[timing.tti].push_back([this, lcid]() { del_srb_impl(lcid); });
}
}
void del_srb_impl(uint32_t lcid)
{
log->info("Deleting SRB%d\n", lcid);
// Only delete SRB1/2
if (lcid > 0) {
pdcp.del_bearer(lcid);
rlc.del_bearer(lcid);
}
// Reset HARQ to generate new transmissions
if (lcid == 0) {
log->info("Resetting UL/DL NDI counters\n");
memset(last_dl_ndi, 0, sizeof(last_dl_ndi));
memset(last_ul_ndi, 0, sizeof(last_ul_ndi));
}
}
// RRC interface for PDCP, PDCP calls RRC to push RRC SDU
void write_pdu(uint32_t lcid, unique_byte_buffer_t pdu)
{
log->info_hex(pdu->msg,
pdu->N_bytes,
"RRC SDU received for LCID=%d cell_id=%d (%d B)\n",
lcid,
cells[pcell_idx]->cell.id,
pdu->N_bytes);
// check cell ID
if (cells[pcell_idx]->cell.id > 256) {
log->error("Cell ID too large to fit in single byte.\n");
return;
}
// We don't handle RRC, prepend LCID
pdu->msg--;
*pdu->msg = lcid;
pdu->N_bytes++;
// prepend pcell PCID
pdu->msg--;
*pdu->msg = static_cast<uint8_t>(cells[pcell_idx]->cell.id);
pdu->N_bytes++;
// push content to Titan
srb.tx(std::move(pdu));
}
// Not supported right now
void write_pdu_bcch_bch(unique_byte_buffer_t pdu) { log->error("%s not implemented.\n", __FUNCTION__); }
void write_pdu_bcch_dlsch(unique_byte_buffer_t pdu) { log->error("%s not implemented.\n", __FUNCTION__); }
void write_pdu_pcch(unique_byte_buffer_t pdu) { log->error("%s not implemented.\n", __FUNCTION__); }
void write_pdu_mch(uint32_t lcid, unique_byte_buffer_t pdu) { log->error("%s not implemented.\n", __FUNCTION__); }
void max_retx_attempted() { log->error("%s not implemented.\n", __FUNCTION__); }
std::string get_rb_name(uint32_t lcid)
{
if (lcid < rb_id_vec.size()) {
return rb_id_vec.at(lcid);
}
return std::string("RB");
};
void write_sdu(uint32_t lcid, unique_byte_buffer_t sdu, bool blocking = true)
{
log->info_hex(sdu->msg, sdu->N_bytes, "Received SDU on LCID=%d\n", lcid);
uint8_t* mac_pdu_ptr;
mac_pdu_ptr = mac_msg_dl.write_packet(log);
log->info_hex(mac_pdu_ptr, mac_msg_dl.get_pdu_len(), "DL MAC PDU:\n");
// Prepare MAC grant for CCCH
mac_interface_phy_lte::mac_grant_dl_t dl_grant = {};
dl_grant.pid = get_pid(tti);
dl_grant.rnti = dl_rnti;
dl_grant.tb[0].tbs = mac_msg_dl.get_pdu_len();
dl_grant.tb[0].ndi_present = true;
dl_grant.tb[0].ndi = get_ndi_for_new_dl_tx(tti);
// Pass to UE
ue->new_tb(dl_grant, (const uint8_t*)mac_pdu_ptr);
}
void discard_sdu(uint32_t lcid, uint32_t sn) {}
bool rb_is_um(uint32_t lcid) { return false; }
void set_as_security(const ttcn3_helpers::timing_info_t timing,
std::array<uint8_t, 32> k_rrc_enc_,
std::array<uint8_t, 32> k_rrc_int_,
std::array<uint8_t, 32> k_up_enc_,
const srslte::CIPHERING_ALGORITHM_ID_ENUM cipher_algo_,
const srslte::INTEGRITY_ALGORITHM_ID_ENUM integ_algo_,
const ttcn3_helpers::pdcp_count_map_t bearers_)
{
if (timing.now) {
set_as_security_impl(k_rrc_enc_, k_rrc_int_, k_up_enc_, cipher_algo_, integ_algo_, bearers_);
} else {
log->debug("Scheduling AS security configuration for TTI=%d\n", timing.tti);
tti_actions[timing.tti].push_back(
[this, k_rrc_enc_, k_rrc_int_, k_up_enc_, cipher_algo_, integ_algo_, bearers_]() {
set_as_security_impl(k_rrc_enc_, k_rrc_int_, k_up_enc_, cipher_algo_, integ_algo_, bearers_);
});
}
}
void set_as_security_impl(std::array<uint8_t, 32> k_rrc_enc_,
std::array<uint8_t, 32> k_rrc_int_,
std::array<uint8_t, 32> k_up_enc_,
const srslte::CIPHERING_ALGORITHM_ID_ENUM cipher_algo_,
const srslte::INTEGRITY_ALGORITHM_ID_ENUM integ_algo_,
const ttcn3_helpers::pdcp_count_map_t bearers)
{
// store security config for later use (i.e. new bearer added)
sec_cfg = {.k_rrc_int = k_rrc_int_,
.k_rrc_enc = k_rrc_enc_,
.k_up_int = {},
.k_up_enc = k_up_enc_,
.integ_algo = integ_algo_,
.cipher_algo = cipher_algo_};
// try to apply security config on bearers
pending_bearer_config = try_set_pdcp_security(bearers);
}
/**
* Try to configure PDCP security on the list of provided bearers.
*
* The function iterates over the map of bearers and tries to set/update
* the security settings, if and only if, the current DL/UL counter match
* with the requested values in the bearer map.
*
* The function returns a map of bearers for which it could not update the
* configuration.
*
* @param bearers for which PDCP configuration should be updated
* @return list of bearers for which update could not be carried out (fully)
*/
ttcn3_helpers::pdcp_count_map_t try_set_pdcp_security(ttcn3_helpers::pdcp_count_map_t bearers)
{
ttcn3_helpers::pdcp_count_map_t update_needed_list;
for (auto& lcid : bearers) {
uint16_t dl_sn = 0, ul_sn = 0, tmp = 0;
pdcp.get_bearer_status(lcid.rb_id, &dl_sn, &tmp, &ul_sn, &tmp);
if (lcid.dl_value_valid) {
// make sure the current DL SN value match
if (lcid.dl_value == dl_sn) {
log->info("Setting AS security for LCID=%d in DL direction\n", lcid.rb_id);
pdcp.config_security(lcid.rb_id, sec_cfg);
pdcp.enable_integrity(lcid.rb_id, DIRECTION_TX);
pdcp.enable_encryption(lcid.rb_id, DIRECTION_TX);
lcid.dl_value_valid = false;
} else {
log->info("Delaying AS security configuration of lcid=%d. DL: %d != %d\n", lcid.rb_id, lcid.dl_value, dl_sn);
}
} else {
log->debug("Downlink AS Security already applied for lcid=%d\n", lcid.rb_id);
}
if (lcid.ul_value_valid) {
// Check UL count
if (lcid.ul_value == ul_sn) {
log->info("Setting AS security for LCID=%d in UL direction\n", lcid.rb_id);
pdcp.config_security(lcid.rb_id, sec_cfg);
pdcp.enable_integrity(lcid.rb_id, DIRECTION_RX);
pdcp.enable_encryption(lcid.rb_id, DIRECTION_RX);
lcid.ul_value_valid = false;
} else {
log->info("Delaying AS security configuration of lcid=%d. UL: %d != %d\n", lcid.rb_id, lcid.ul_value, ul_sn);
}
} else {
log->debug("Uplink AS Security already applied for lcid=%d\n", lcid.rb_id);
}
// re-consider if at least one direction needs reconfiguration
if (lcid.dl_value_valid || lcid.ul_value_valid) {
log->debug("Adding LCID=%d for later configuration (size=%zd)\n", lcid.rb_id, update_needed_list.size());
update_needed_list.push_back(lcid);
}
}
return update_needed_list;
}
void release_as_security(const ttcn3_helpers::timing_info_t timing)
{
if (timing.now) {
release_as_security_impl();
} else {
log->debug("Scheduling Release of AS security for TTI=%d\n", timing.tti);
tti_actions[timing.tti].push_back([this]() { release_as_security_impl(); });
}
}
void release_as_security_impl()
{
log->info("Releasing AS security\n");
pending_bearer_config.clear();
}
void select_cell(srslte_cell_t phy_cell)
{
// find matching cell in SS cell list
for (uint32_t i = 0; i < cells.size(); ++i) {
if (cells[i]->cell.id == phy_cell.id) {
pcell_idx = i;
log->info("New PCell: PCI=%d\n", cells[pcell_idx]->cell.id);
return;
}
}
}
ttcn3_helpers::pdcp_count_map_t get_pdcp_count()
{
// prepare response to SS
std::vector<ttcn3_helpers::pdcp_count_t> bearers;
for (uint32_t i = 0; i < rb_id_vec.size(); i++) {
if (pdcp.is_lcid_enabled(i)) {
ttcn3_helpers::pdcp_count_t bearer;
uint16_t tmp; // not handling HFN
pdcp.get_bearer_status(i, &bearer.dl_value, &tmp, &bearer.ul_value, &tmp);
bearer.rb_is_srb = i <= 2;
bearer.rb_id = i;
log->debug("PDCP count lcid=%d, dl=%d, ul=%d\n", bearer.rb_id, bearer.dl_value, bearer.ul_value);
bearers.push_back(bearer);
}
}
return bearers;
}
private:
// SYS interface
ttcn3_ut_interface ut;
ttcn3_sys_interface sys;
ttcn3_ip_sock_interface ip_sock;
ttcn3_ip_ctrl_interface ip_ctrl;
ttcn3_srb_interface srb;
// Epoll
int epoll_fd = -1;
int signal_fd = -1; ///< FD for signals
std::map<uint32_t, epoll_handler*> event_handler; ///< Lookup table for handler
epoll_timer_handler timer_handler;
epoll_signal_handler signal_handler;
// Logging stuff
srslte::logger_stdout logger_stdout;
srslte::logger_file* logger_file = nullptr;
srslte::logger* logger = nullptr;
srslte::log_ref log;
srslte::log_filter ut_log;
srslte::log_filter sys_log;
srslte::log_filter ip_sock_log;
srslte::log_filter ip_ctrl_log;
srslte::log_filter srb_log;
srslte::log_ref ss_mac_log;
srslte::log_filter ss_rlc_log;
srslte::log_filter ss_pdcp_log;
all_args_t args = {};
srslte::byte_buffer_pool* pool = nullptr;
// Simulator vars
ttcn3_ue* ue = nullptr;
bool running = false;
typedef enum { UE_SWITCH_ON = 0, UE_SWITCH_OFF, ENABLE_DATA, DISABLE_DATA } ss_events_t;
block_queue<ss_events_t> event_queue;
uint32_t run_id = 0;
int32_t tti = 0;
int32_t prach_tti = -1;
int32_t rar_tti = -1;
int32_t msg3_tti = -1;
int32_t sr_tti = -1;
uint32_t prach_preamble_index = 0;
uint16_t dl_rnti = 0;
uint16_t crnti = TTCN3_CRNTI;
int force_lcid = -1;
srslte::timer_handler timers;
bool last_dl_ndi[SRSLTE_FDD_NOF_HARQ] = {};
bool last_ul_ndi[SRSLTE_FDD_NOF_HARQ] = {};
// For events/actions that need to be carried out in a specific TTI
typedef std::vector<move_task_t> task_list_t;
typedef std::map<const uint32_t, task_list_t> tti_action_map_t;
tti_action_map_t tti_actions;
// Map between the cellId (name) used by 3GPP test suite and srsLTE cell struct
typedef struct {
std::string name;
srslte_cell_t cell = {};
float initial_power = 0.0;
float attenuation = 0.0;
uint32_t earfcn = 0;
std::vector<unique_byte_buffer_t> sibs;
int sib_idx = 0; ///< Index of SIB scheduled for next transmission
} syssim_cell_t;
typedef std::unique_ptr<syssim_cell_t> unique_syssim_cell_t;
std::vector<unique_syssim_cell_t> cells;
int32_t pcell_idx = -1;
srslte::pdu_queue pdus;
srslte::sch_pdu mac_msg_dl, mac_msg_ul;
// buffer for DL transmissions
srslte::byte_buffer_t rar_buffer;
srslte::byte_buffer_t tx_payload_buffer; // Used to buffer final MAC PDU
uint64_t conres_id = 0;
// Simulator objects
srslte::rlc rlc;
srslte::pdcp pdcp;
std::map<uint32_t, bool> bearer_follow_on_map; ///< Indicates if for a given LCID the follow_on_flag is set or not
// security config
ttcn3_helpers::pdcp_count_map_t pending_bearer_config; ///< List of bearers with pending security configuration
srslte::as_security_config_t sec_cfg;
std::vector<std::string> rb_id_vec =
{"SRB0", "SRB1", "SRB2", "DRB1", "DRB2", "DRB3", "DRB4", "DRB5", "DRB6", "DRB7", "DRB8"};
// port constants
const std::string listen_address = "0.0.0.0";
const uint32_t UT_PORT = 2222;
const uint32_t SYS_PORT = 2223;
const uint32_t IPSOCK_PORT = 2224;
const uint32_t IPCTRL_PORT = 2225;
const uint32_t SRB_PORT = 2226;
};
#endif // SRSUE_TTCN3_SYSSIM_H
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