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srsRAN_4G/lib/include/srsran/common/basic_pnf.h

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/**
* Copyright 2013-2021 Software Radio Systems Limited
*
* This file is part of srsRAN.
*
* srsRAN 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.
*
* srsRAN 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 SRSRAN_BASIC_PNF_H
#define SRSRAN_BASIC_PNF_H
#include "basic_vnf_api.h"
#include "common.h"
#include "srsran/adt/choice_type.h"
#include "srsran/common/block_queue.h"
#include "srsran/common/buffer_pool.h"
#include "srsran/srslog/srslog.h"
#include <arpa/inet.h>
#include <atomic>
#include <errno.h>
#include <fcntl.h>
#include <iostream>
#include <mutex>
#include <netinet/in.h>
#include <poll.h>
#include <random>
#include <strings.h>
#include <sys/socket.h>
#include <thread>
#include <unistd.h>
#define RAND_SEED (12384)
#define RX_TIMEOUT_MS (500)
#define MIN_TB_LEN (100) // MAX_TB_LEN defined in api.h
#define PING_REQUEST_PDU 1
namespace srsran {
struct pnf_metrics_t {
uint32_t avg_rtt_us;
uint32_t num_timing_errors;
uint32_t num_pdus;
uint32_t tb_size;
};
class srsran_basic_pnf
{
using msg_header_t = basic_vnf_api::msg_header_t;
const static size_t buffer_size =
srsran::static_max<sizeof(basic_vnf_api::dl_conf_msg_t), sizeof(basic_vnf_api::tx_request_msg_t)>::value;
using msg_buffer_t = std::array<uint8_t, buffer_size>;
public:
srsran_basic_pnf(const std::string& type_,
const std::string& vnf_p5_addr,
const uint16_t& vnf_p5_port,
const uint32_t& sf_interval,
const int32_t& num_sf_,
const uint32_t& tb_len_) :
running(false),
type(type_),
tti(100), ///< Random start TTI
vnf_addr(vnf_p5_addr),
vnf_port(vnf_p5_port),
sf_interval_us(sf_interval),
num_sf(num_sf_),
tb_len(tb_len_),
rand_gen(RAND_SEED),
rand_dist(MIN_TB_LEN, MAX_TB_LEN)
{
logger.set_level(srslog::basic_levels::warning);
logger.set_hex_dump_max_size(-1);
}
~srsran_basic_pnf() { stop(); };
bool start()
{
// create socket
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
perror("socket");
return false;
}
int enable = 1;
#if defined(SO_REUSEADDR)
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0) {
perror("setsockopt(SO_REUSEADDR) failed");
}
#endif
#if defined(SO_REUSEPORT)
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, &enable, sizeof(int)) < 0) {
perror("setsockopt(SO_REUSEPORT) failed");
}
#endif
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(vnf_addr.c_str());
servaddr.sin_port = htons(vnf_port);
// start main thread
running = true;
if (type == "gnb") {
rx_thread = std::unique_ptr<std::thread>(new std::thread(&srsran_basic_pnf::dl_handler_thread, this));
tx_thread = std::unique_ptr<std::thread>(new std::thread(&srsran_basic_pnf::ul_handler_thread, this));
} else {
tx_thread = std::unique_ptr<std::thread>(new std::thread(&srsran_basic_pnf::ue_dl_handler_thread, this));
}
return true;
};
bool stop()
{
running = false;
if (rx_thread) {
if (rx_thread->joinable()) {
rx_thread->join();
}
}
if (tx_thread) {
if (tx_thread->joinable()) {
tx_thread->join();
}
}
return true;
};
pnf_metrics_t get_metrics()
{
pnf_metrics_t tmp = metrics;
metrics = {};
return tmp;
}
void connect_out_rf_queue(srsran::block_queue<srsran::unique_byte_buffer_t>* rf_queue_)
{
rf_out_queue = rf_queue_;
policy = bridge;
}
srsran::block_queue<srsran::unique_byte_buffer_t>* get_in_rf_queue()
{
policy = bridge;
return &rf_in_queue;
}
private:
//! Waits for DL Config or Tx Request Msg from VNF and forwards to RF
void dl_handler_thread()
{
pthread_setname_np(pthread_self(), rx_thread_name.c_str());
// set_rt_prio();
struct pollfd fd;
fd.fd = sockfd;
fd.events = POLLIN;
std::unique_ptr<msg_buffer_t> rx_buffer{new msg_buffer_t{}};
while (running) {
// receive response
int ret = poll(&fd, 1, RX_TIMEOUT_MS);
switch (ret) {
case -1:
printf("Error occurred.\n");
running = false;
break;
case 0:
// Timeout
printf("Error: Didn't receive response after %dms\n", RX_TIMEOUT_MS);
break;
default:
int recv_ret = recv(sockfd, rx_buffer->data(), sizeof(*rx_buffer), 0);
handle_msg(rx_buffer->data(), recv_ret);
break;
}
std::lock_guard<std::mutex> lock(mutex);
auto rtt =
std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now() - tti_start_time)
.count();
// TODO: add averaging
metrics.avg_rtt_us = rtt;
}
};
void ul_handler_thread()
{
pthread_setname_np(pthread_self(), tx_thread_name.c_str());
// set_rt_prio();
struct pollfd fd;
fd.fd = sockfd;
fd.events = POLLIN;
const uint32_t max_basic_api_pdu = sizeof(basic_vnf_api::dl_conf_msg_t) + 32; // larger than biggest message
std::unique_ptr<std::array<uint8_t, max_basic_api_pdu> > rx_buffer =
std::unique_ptr<std::array<uint8_t, max_basic_api_pdu> >(new std::array<uint8_t, max_basic_api_pdu>);
int32_t sf_counter = 0;
while (running && (num_sf > 0 ? sf_counter < num_sf : true)) {
{
std::lock_guard<std::mutex> lock(mutex);
// Increase TTI
tti = (tti + 1) % 10240;
// Take time before sending the SF indication
tti_start_time = std::chrono::steady_clock::now();
// Send request
send_sf_ind(tti);
if (policy == bridge) {
// send_rx_data_ind(tti);
} else {
// provide UL data every 2nd TTI
if (tti % 2 == 0) {
send_rx_data_ind(tti);
}
}
sf_counter++;
}
std::this_thread::sleep_for(std::chrono::microseconds(sf_interval_us));
}
printf("Leaving Tx thread after %d subframes\n", sf_counter);
};
void ue_dl_handler_thread()
{
pthread_setname_np(pthread_self(), tx_thread_name.c_str());
// set_rt_prio();
struct pollfd fd;
fd.fd = sockfd;
fd.events = POLLIN;
const uint32_t max_basic_api_pdu = sizeof(basic_vnf_api::dl_conf_msg_t) + 32; // larger than biggest message
std::unique_ptr<std::array<uint8_t, max_basic_api_pdu> > rx_buffer =
std::unique_ptr<std::array<uint8_t, max_basic_api_pdu> >(new std::array<uint8_t, max_basic_api_pdu>);
int32_t sf_counter = 0;
while (running && (num_sf > 0 ? sf_counter < num_sf : true)) {
{
std::lock_guard<std::mutex> lock(mutex);
// Increase TTI
tti = (tti + 1) % 10240;
// Take time before sending the SF indication
tti_start_time = std::chrono::steady_clock::now();
// Send SF indication
send_sf_ind(tti);
if (policy == bridge) {
srsran::unique_byte_buffer_t tb;
if (rf_in_queue.try_pop(&tb)) {
send_dl_ind(tti, std::move(tb));
}
} else {
// provide DL grant every even TTI, and UL grant every odd
if (tti % 2 == 0) {
send_dl_ind(tti);
} else {
send_ul_ind(tti);
}
}
sf_counter++;
}
std::this_thread::sleep_for(std::chrono::microseconds(sf_interval_us));
}
printf("Leaving Tx thread after %d subframes\n", sf_counter);
};
void send_sf_ind(uint32_t tti_)
{
basic_vnf_api::sf_ind_msg_t sf_ind;
bzero(&sf_ind, sizeof(sf_ind));
sf_ind.header.type = basic_vnf_api::SF_IND;
sf_ind.header.msg_len = sizeof(sf_ind) - sizeof(basic_vnf_api::msg_header_t);
sf_ind.tti = tti_;
sf_ind.t1 = 0;
sf_ind.tb_len = tb_len > 0 ? tb_len : rand_dist(rand_gen);
int n = 0;
if ((n = sendto(sockfd, &sf_ind, sizeof(sf_ind), 0, (struct sockaddr*)&servaddr, sizeof(servaddr))) < 0) {
printf("sendto failed, ret=%d\n", n);
}
}
int handle_msg(const uint8_t* buffer, const uint32_t len)
{
basic_vnf_api::msg_header_t* header = (basic_vnf_api::msg_header_t*)buffer;
logger.debug("Received %s (%d B) in TTI", basic_vnf_api::msg_type_text[header->type], len);
switch (header->type) {
case basic_vnf_api::SF_IND:
printf("Error: %s not handled by VNF\n", basic_vnf_api::msg_type_text[header->type]);
break;
case basic_vnf_api::DL_CONFIG:
handle_dl_config((basic_vnf_api::dl_conf_msg_t*)header);
break;
case basic_vnf_api::TX_REQUEST:
handle_tx_request((basic_vnf_api::tx_request_msg_t*)header);
break;
default:
printf("Unknown msg type.\n");
break;
}
return 0;
}
int handle_dl_config(basic_vnf_api::dl_conf_msg_t* msg)
{
// printf("Received DL config for TTI=%d\n", msg->tti);
if (msg->tti != tti) {
metrics.num_timing_errors++;
// printf("Received DL config for TTI=%d but current TTI is %d\n", msg->tti, tti.load());
return -1;
}
return 0;
}
int handle_tx_request(basic_vnf_api::tx_request_msg_t* msg)
{
if (msg->tti != tti) {
metrics.num_timing_errors++;
}
for (uint32_t i = 0; i < msg->nof_pdus; ++i) {
metrics.tb_size += msg->pdus[i].length;
}
metrics.num_pdus += msg->nof_pdus;
if (rf_out_queue != nullptr) {
uint32_t len = sizeof(*msg) - sizeof(msg->pdus->data) + msg->pdus->length;
srsran::unique_byte_buffer_t tx = srsran::make_byte_buffer();
if (tx == nullptr) {
return -1;
}
memcpy(tx->msg, msg, len);
rf_out_queue->push(std::move(tx));
}
return 0;
}
void send_rx_data_ind(const uint32_t tti_)
{
// MAC PDU for UL-SCH with IPv6 router solicitation
static uint8_t tv[] = {0x04, 0x38, 0x00, 0x80, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x00, 0x08, 0x3a, 0xff, 0xfe,
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x44, 0x4b, 0x0f, 0x2c, 0x33, 0x98, 0xf2,
0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x02, 0x85, 0x00, 0x4b, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x2f, 0x7f, 0x00, 0x00, 0x3f, 0x00};
basic_vnf_api::rx_data_ind_msg_t rx_ind = {};
rx_ind.header.type = basic_vnf_api::RX_DATA_IND;
rx_ind.header.msg_len = sizeof(rx_ind) - sizeof(basic_vnf_api::msg_header_t);
rx_ind.sfn = tti_;
rx_ind.t1 = 0;
rx_ind.nof_pdus = 1;
rx_ind.pdus[0].type = basic_vnf_api::PUSCH;
rx_ind.pdus[0].length = tb_len > 0 ? tb_len : rand_dist(rand_gen);
if (rx_ind.pdus[0].length >= sizeof(tv)) {
// copy TV
memcpy(rx_ind.pdus[0].data, tv, sizeof(tv));
// set remaining bytes to zero
memset(rx_ind.pdus[0].data + sizeof(tv), 0xaa, rx_ind.pdus[0].length - sizeof(tv));
} else {
// just fill with dummy bytes
memset(rx_ind.pdus[0].data, 0xab, rx_ind.pdus[0].length);
}
int n = 0;
if ((n = sendto(sockfd, &rx_ind, sizeof(rx_ind), 0, (struct sockaddr*)&servaddr, sizeof(servaddr))) < 0) {
printf("sendto failed, ret=%d\n", n);
}
}
void send_dl_ind(uint32_t tti_, srsran::unique_byte_buffer_t tb = {})
{
#if PING_REQUEST_PDU
static uint8_t tv[] = {
0x04, 0x5c, 0x00, 0x80, 0x00, 0x00, 0x45, 0x00, 0x00, 0x54, 0x15, 0x02, 0x40, 0x00, 0x40, 0x01, 0xa2, 0x52,
0xc0, 0xa8, 0x01, 0x01, 0xc0, 0xa8, 0x01, 0x03, 0x08, 0x00, 0x26, 0x40, 0x5e, 0x8f, 0x00, 0xb3, 0x04, 0x55,
0xc4, 0x5d, 0x00, 0x00, 0x00, 0x00, 0xe4, 0xf7, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x11, 0x12, 0x13,
0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x4f, 0x7f, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
#else
// MAC PDU with a single LCID with padding only
static uint8_t tv[] = {
0x01,
0x08,
0x11,
0x22,
0x33,
0x44,
0x55,
0x66,
0x77,
0x88,
0x3f,
};
#endif // PING_REQUEST_PDU
basic_vnf_api::dl_ind_msg_t dl_ind = {};
dl_ind.header.type = basic_vnf_api::DL_IND;
dl_ind.header.msg_len = sizeof(dl_ind) - sizeof(basic_vnf_api::msg_header_t);
dl_ind.tti = tti_;
dl_ind.t1 = 0;
uint32_t tot_bytes = 0;
uint32_t tb_size = tb_len > 0 ? tb_len : rand_dist(rand_gen);
if (tb != nullptr) {
auto* header = (basic_vnf_api::msg_header_t*)tb->msg;
if (header->type == basic_vnf_api::TX_REQUEST) {
auto* tx_req = (basic_vnf_api::tx_request_msg_t*)tb->msg;
dl_ind.nof_pdus = tx_req->nof_pdus;
// dl_ind.tti = tx_req->tti;
for (uint32_t i = 0; i < dl_ind.nof_pdus; ++i) {
dl_ind.pdus[i].length = tx_req->pdus[i].length;
dl_ind.pdus[i].type = tx_req->pdus[i].type;
memcpy(dl_ind.pdus[i].data, tx_req->pdus[i].data, dl_ind.pdus[i].length);
tot_bytes += dl_ind.pdus[i].length;
logger.info(
dl_ind.pdus[i].data, dl_ind.pdus[i].length, "Sending to UE a PDU (%d bytes)", dl_ind.pdus[i].length);
}
}
} else {
uint32_t N_bytes = sizeof(tv);
// Create default
dl_ind.nof_pdus = 1;
dl_ind.pdus[0].type = basic_vnf_api::PDSCH;
dl_ind.pdus[0].length = tb_size;
if (dl_ind.pdus[0].length >= N_bytes) {
// copy TV
memcpy(dl_ind.pdus[0].data, tv, N_bytes);
tot_bytes = N_bytes;
}
logger.info(dl_ind.pdus[0].data, N_bytes, "Sending to UE a TB (%d bytes)", N_bytes);
}
if (tot_bytes > 0 and tot_bytes < tb_size) {
uint8_t* offset = &dl_ind.pdus[dl_ind.nof_pdus - 1].data[dl_ind.pdus[dl_ind.nof_pdus - 1].length];
memset(offset, 0xaa, tb_size - tot_bytes);
} else if (tot_bytes == 0) {
// just fill with dummy bytes
dl_ind.nof_pdus = 1;
memset(dl_ind.pdus[0].data, 0xab, tb_size);
}
int n = 0;
if ((n = sendto(sockfd, &dl_ind, sizeof(dl_ind), 0, (struct sockaddr*)&servaddr, sizeof(servaddr))) < 0) {
printf("sendto failed, ret=%d\n", n);
}
}
void send_ul_ind(uint32_t tti_)
{
basic_vnf_api::ul_ind_msg_t ul_ind = {};
ul_ind.header.type = basic_vnf_api::UL_IND;
ul_ind.header.msg_len = sizeof(ul_ind) - sizeof(basic_vnf_api::msg_header_t);
ul_ind.tti = tti_;
ul_ind.t1 = 0;
ul_ind.pdus.type = basic_vnf_api::PUSCH;
ul_ind.pdus.length = tb_len > 0 ? tb_len : rand_dist(rand_gen);
int n = 0;
if ((n = sendto(sockfd, &ul_ind, sizeof(ul_ind), 0, (struct sockaddr*)&servaddr, sizeof(servaddr))) < 0) {
printf("sendto failed, ret=%d\n", n);
}
}
std::unique_ptr<std::thread> tx_thread, rx_thread;
std::string tx_thread_name = "TX_PNF", rx_thread_name = "RX_PNF";
bool running = false;
srslog::basic_logger& logger = srslog::fetch_basic_logger("PNF", false);
std::mutex mutex;
std::atomic<std::uint32_t> tti;
std::chrono::steady_clock::time_point tti_start_time;
std::string type;
std::string vnf_addr;
uint16_t vnf_port = 3333;
uint32_t sf_interval_us = 1000;
int32_t num_sf = -1;
uint32_t tb_len = 100;
pnf_metrics_t metrics = {};
int sockfd = 0;
struct sockaddr_in servaddr = {};
// For random number generation
std::mt19937 rand_gen;
std::uniform_int_distribution<uint16_t> rand_dist;
// two policies possible: dummy packets generated by the PNF class, or bridge between UE and gNB PNFs with TBs
// entering/exiting each PNF via the rf_in_queue/rf_out_queue.
srsran::block_queue<srsran::unique_byte_buffer_t>* rf_out_queue = nullptr;
srsran::block_queue<srsran::unique_byte_buffer_t> rf_in_queue;
enum data_policy_t { self_gen, bridge } policy = self_gen;
};
} // namespace srsran
#endif // SRSRAN_BASIC_PNF_H
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