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srsLTE/srsenb/test/upper/gtpu_test.cc

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/**
*
* \section COPYRIGHT
*
* Copyright 2013-2021 Software Radio Systems Limited
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the distribution.
*
*/
#include "srsran/asn1/s1ap.h"
#include <linux/ip.h>
#include <numeric>
#include <random>
#include "srsenb/hdr/stack/upper/gtpu.h"
#include "srsenb/test/common/dummy_classes.h"
#include "srsran/common/network_utils.h"
#include "srsran/common/test_common.h"
#include "srsran/upper/gtpu.h"
namespace srsenb {
static const size_t PDU_HEADER_SIZE = 20;
class pdcp_tester : public pdcp_dummy
{
public:
void write_sdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t sdu, int pdcp_sn) override
{
last_sdu = std::move(sdu);
last_pdcp_sn = pdcp_sn;
last_rnti = rnti;
last_lcid = lcid;
}
std::map<uint32_t, srsran::unique_byte_buffer_t> get_buffered_pdus(uint16_t rnti, uint32_t lcid) override
{
return std::move(buffered_pdus);
}
void send_status_report(uint16_t rnti) override {}
void send_status_report(uint16_t rnti, uint32_t lcid) override {}
void push_buffered_pdu(uint32_t sn, srsran::unique_byte_buffer_t pdu) { buffered_pdus[sn] = std::move(pdu); }
void clear()
{
last_sdu = nullptr;
last_pdcp_sn = -1;
last_lcid = 0;
last_rnti = SRSRAN_INVALID_RNTI;
}
std::map<uint32_t, srsran::unique_byte_buffer_t> buffered_pdus;
srsran::unique_byte_buffer_t last_sdu;
int last_pdcp_sn = -1;
uint16_t last_rnti = SRSRAN_INVALID_RNTI;
uint32_t last_lcid = 0;
};
struct dummy_socket_manager : public srsran::socket_manager_itf {
dummy_socket_manager() : srsran::socket_manager_itf(srslog::fetch_basic_logger("TEST")) {}
/// Register (fd, callback). callback is called within socket thread when fd has data.
bool add_socket_handler(int fd, recv_callback_t handler) final
{
if (s1u_fd >= 0) {
return false;
}
s1u_fd = fd;
callback = std::move(handler);
return true;
}
/// remove registered socket fd
bool remove_socket(int fd) final
{
if (s1u_fd < 0) {
return false;
}
s1u_fd = -1;
return true;
}
int s1u_fd = -1;
recv_callback_t callback;
};
const int GTPU_PORT = 2152;
srsran::unique_byte_buffer_t encode_ipv4_packet(srsran::span<uint8_t> data,
uint32_t teid,
const struct sockaddr_in& src_sockaddr_in,
const struct sockaddr_in& dest_sockaddr_in)
{
srsran::unique_byte_buffer_t pdu = srsran::make_byte_buffer();
struct iphdr ip_pkt = {};
ip_pkt.version = 4;
ip_pkt.tot_len = htons(data.size() + sizeof(struct iphdr));
ip_pkt.saddr = src_sockaddr_in.sin_addr.s_addr;
ip_pkt.daddr = dest_sockaddr_in.sin_addr.s_addr;
pdu->append_bytes((uint8_t*)&ip_pkt, sizeof(struct iphdr));
pdu->append_bytes(data.data(), data.size());
return pdu;
}
srsran::unique_byte_buffer_t encode_gtpu_packet(srsran::span<uint8_t> data,
uint32_t teid,
const struct sockaddr_in& src_sockaddr_in,
const struct sockaddr_in& dest_sockaddr_in)
{
srsran::unique_byte_buffer_t pdu = encode_ipv4_packet(data, teid, src_sockaddr_in, dest_sockaddr_in);
// header
srsran::gtpu_header_t header = {};
header.flags = GTPU_FLAGS_VERSION_V1 | GTPU_FLAGS_GTP_PROTOCOL;
header.message_type = GTPU_MSG_DATA_PDU;
header.length = pdu->N_bytes;
header.teid = teid;
gtpu_write_header(&header, pdu.get(), srslog::fetch_basic_logger("GTPU"));
return pdu;
}
srsran::unique_byte_buffer_t encode_end_marker(uint32_t teid)
{
srsran::unique_byte_buffer_t pdu = srsran::make_byte_buffer();
// header
srsran::gtpu_header_t header = {};
header.flags = GTPU_FLAGS_VERSION_V1 | GTPU_FLAGS_GTP_PROTOCOL;
header.message_type = GTPU_MSG_END_MARKER;
header.length = 0;
header.teid = teid;
gtpu_write_header(&header, pdu.get(), srslog::fetch_basic_logger("GTPU"));
return pdu;
}
srsran::unique_byte_buffer_t read_socket(int fd)
{
srsran::unique_byte_buffer_t pdu = srsran::make_byte_buffer();
pdu->N_bytes = read(fd, pdu->msg, pdu->get_tailroom());
return pdu;
}
void test_gtpu_tunnel_manager()
{
const char* sgw_addr_str = "127.0.0.1";
struct sockaddr_in sgw_sockaddr = {};
srsran::net_utils::set_sockaddr(&sgw_sockaddr, sgw_addr_str, GTPU_PORT);
uint32_t sgw_addr = ntohl(sgw_sockaddr.sin_addr.s_addr);
const uint32_t drb1_lcid = 3;
srsran::task_scheduler task_sched;
gtpu_args_t gtpu_args = {};
gtpu_tunnel_manager tunnels(&task_sched, srslog::fetch_basic_logger("GTPU"));
tunnels.init(gtpu_args, nullptr);
TESTASSERT(tunnels.find_tunnel(0) == nullptr);
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x46, drb1_lcid).empty());
TESTASSERT(tunnels.find_rnti_tunnels(0x46) == nullptr);
// Creation of tunnels for different users and lcids
const gtpu_tunnel* tun = tunnels.add_tunnel(0x46, drb1_lcid, 5, sgw_addr);
TESTASSERT(tun != nullptr);
TESTASSERT(tunnels.find_tunnel(tun->teid_in) == tun);
const gtpu_tunnel* tun2 = tunnels.add_tunnel(0x47, drb1_lcid, 6, sgw_addr);
TESTASSERT(tun2 != nullptr);
TESTASSERT(tunnels.find_tunnel(tun2->teid_in) == tun2);
tun2 = tunnels.add_tunnel(0x47, drb1_lcid + 1, 7, sgw_addr);
TESTASSERT(tun2 != nullptr);
TESTASSERT(tunnels.find_tunnel(tun2->teid_in) == tun2);
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x46, drb1_lcid).size() == 1);
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x47, drb1_lcid).size() == 1);
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x47, drb1_lcid + 1).size() == 1);
// TEST: Creation/Removal of indirect tunnel
const gtpu_tunnel* fwd_tun = tunnels.add_tunnel(0x46, drb1_lcid, 8, sgw_addr);
TESTASSERT(fwd_tun != nullptr);
TESTASSERT(tunnels.find_tunnel(fwd_tun->teid_in) == fwd_tun);
tunnels.setup_forwarding(tun->teid_in, fwd_tun->teid_in);
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x46, drb1_lcid).size() == 2);
// Removing a tunnel also clears any associated forwarding tunnel
TESTASSERT(tunnels.remove_tunnel(tun->teid_in));
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x46, drb1_lcid).empty());
// TEST: Prioritization of one TEID over another
const gtpu_tunnel* before_tun = tunnels.add_tunnel(0x46, drb1_lcid, 7, sgw_addr);
const gtpu_tunnel* after_tun = tunnels.add_tunnel(0x46, drb1_lcid, 8, sgw_addr);
TESTASSERT(before_tun != nullptr and after_tun != nullptr);
tunnels.set_tunnel_priority(before_tun->teid_in, after_tun->teid_in);
for (uint32_t i = 0; i < 1000; ++i) {
TESTASSERT(before_tun->state == gtpu_tunnel_manager::tunnel_state::pdcp_active);
TESTASSERT(after_tun->state == gtpu_tunnel_manager::tunnel_state::buffering);
// while Rx packets are received, active forwarding TEID should not be removed
tunnels.handle_rx_pdcp_sdu(before_tun->teid_in);
}
// Removing active TEID, will automatically switch TEID paths
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x46, drb1_lcid).size() == 2);
tunnels.remove_tunnel(before_tun->teid_in);
TESTASSERT(tunnels.find_rnti_lcid_tunnels(0x46, drb1_lcid).size() == 1);
TESTASSERT(after_tun->state == gtpu_tunnel_manager::tunnel_state::pdcp_active);
}
enum class tunnel_test_event { success, wait_end_marker_timeout };
int test_gtpu_direct_tunneling(tunnel_test_event event)
{
std::random_device rd;
std::mt19937 g(rd());
srslog::basic_logger& logger = srslog::fetch_basic_logger("TEST");
logger.info("\n\n**** Test GTPU Direct Tunneling ****\n");
uint16_t rnti = 0x46, rnti2 = 0x50;
uint32_t drb1 = 3;
uint32_t sgw_teidout1 = 1, sgw_teidout2 = 2;
const char * sgw_addr_str = "127.0.0.1", *senb_addr_str = "127.0.1.1", *tenb_addr_str = "127.0.1.2";
struct sockaddr_in senb_sockaddr = {}, sgw_sockaddr = {}, tenb_sockaddr = {};
srsran::net_utils::set_sockaddr(&senb_sockaddr, senb_addr_str, GTPU_PORT);
srsran::net_utils::set_sockaddr(&sgw_sockaddr, sgw_addr_str, GTPU_PORT);
srsran::net_utils::set_sockaddr(&tenb_sockaddr, tenb_addr_str, GTPU_PORT);
uint32_t tenb_addr = ntohl(tenb_sockaddr.sin_addr.s_addr);
uint32_t senb_addr = ntohl(senb_sockaddr.sin_addr.s_addr);
uint32_t sgw_addr = ntohl(sgw_sockaddr.sin_addr.s_addr);
srsran::unique_byte_buffer_t pdu;
// Initiate layers
srslog::basic_logger& logger1 = srslog::fetch_basic_logger("GTPU1");
logger1.set_hex_dump_max_size(2048);
srslog::basic_logger& logger2 = srslog::fetch_basic_logger("GTPU2");
logger2.set_hex_dump_max_size(2048);
srsran::task_scheduler task_sched;
dummy_socket_manager senb_rx_sockets, tenb_rx_sockets;
srsenb::gtpu senb_gtpu(&task_sched, logger1, &senb_rx_sockets), tenb_gtpu(&task_sched, logger2, &tenb_rx_sockets);
pdcp_tester senb_pdcp, tenb_pdcp;
gtpu_args_t gtpu_args;
gtpu_args.gtp_bind_addr = senb_addr_str;
gtpu_args.mme_addr = sgw_addr_str;
gtpu_args.indirect_tunnel_timeout_msec = std::uniform_int_distribution<uint32_t>{500, 2000}(g);
senb_gtpu.init(gtpu_args, &senb_pdcp);
gtpu_args.gtp_bind_addr = tenb_addr_str;
tenb_gtpu.init(gtpu_args, &tenb_pdcp);
// create tunnels MME-SeNB and MME-TeNB
uint32_t senb_teid_in = senb_gtpu.add_bearer(rnti, drb1, sgw_addr, sgw_teidout1).value();
uint32_t tenb_teid_in = tenb_gtpu.add_bearer(rnti2, drb1, sgw_addr, sgw_teidout2).value();
// Buffer PDUs in SeNB PDCP
for (size_t sn = 6; sn < 10; ++sn) {
std::vector<uint8_t> data(10, sn);
pdu = encode_ipv4_packet(data, senb_teid_in, sgw_sockaddr, senb_sockaddr);
senb_pdcp.push_buffered_pdu(sn, std::move(pdu));
}
// create direct tunnel SeNB-TeNB
gtpu::bearer_props props;
props.flush_before_teidin_present = true;
props.flush_before_teidin = tenb_teid_in;
uint32_t dl_tenb_teid_in = tenb_gtpu.add_bearer(rnti2, drb1, senb_addr, 0, &props).value();
props = {};
props.forward_from_teidin_present = true;
props.forward_from_teidin = senb_teid_in;
senb_gtpu.add_bearer(rnti, drb1, tenb_addr, dl_tenb_teid_in, &props);
std::vector<uint8_t> data_vec(10);
std::iota(data_vec.begin(), data_vec.end(), 0);
std::vector<uint8_t> encoded_data;
srsran::span<uint8_t> pdu_view{};
// TEST: GTPU buffers incoming PDCP buffered SNs until the TEID is explicitly activated
tenb_gtpu.handle_gtpu_s1u_rx_packet(read_socket(tenb_rx_sockets.s1u_fd), senb_sockaddr);
TESTASSERT(tenb_pdcp.last_sdu == nullptr);
tenb_gtpu.handle_gtpu_s1u_rx_packet(read_socket(tenb_rx_sockets.s1u_fd), senb_sockaddr);
TESTASSERT(tenb_pdcp.last_sdu == nullptr);
tenb_gtpu.set_tunnel_status(dl_tenb_teid_in, true);
pdu_view = srsran::make_span(tenb_pdcp.last_sdu);
TESTASSERT(std::count(pdu_view.begin() + PDU_HEADER_SIZE, pdu_view.end(), 7) == 10);
TESTASSERT(tenb_pdcp.last_rnti == rnti2);
TESTASSERT(tenb_pdcp.last_lcid == drb1);
TESTASSERT(tenb_pdcp.last_pdcp_sn == (int)7);
// TEST: verify that PDCP buffered SNs have been forwarded through SeNB->TeNB tunnel
for (size_t sn = 8; sn < 10; ++sn) {
tenb_gtpu.handle_gtpu_s1u_rx_packet(read_socket(tenb_rx_sockets.s1u_fd), senb_sockaddr);
pdu_view = srsran::make_span(tenb_pdcp.last_sdu);
TESTASSERT(std::count(pdu_view.begin() + PDU_HEADER_SIZE, pdu_view.end(), sn) == 10);
TESTASSERT(tenb_pdcp.last_rnti == rnti2);
TESTASSERT(tenb_pdcp.last_lcid == drb1);
TESTASSERT(tenb_pdcp.last_pdcp_sn == (int)sn);
}
// TEST: verify that incoming DL data MME->SeNB is forwarded through SeNB->TeNB tunnel
std::shuffle(data_vec.begin(), data_vec.end(), g);
pdu = encode_gtpu_packet(data_vec, senb_teid_in, sgw_sockaddr, senb_sockaddr);
encoded_data.assign(pdu->msg + 8u, pdu->msg + pdu->N_bytes);
senb_gtpu.handle_gtpu_s1u_rx_packet(std::move(pdu), sgw_sockaddr);
tenb_gtpu.handle_gtpu_s1u_rx_packet(read_socket(tenb_rx_sockets.s1u_fd), senb_sockaddr);
pdu_view = srsran::make_span(tenb_pdcp.last_sdu);
TESTASSERT(pdu_view.size() == encoded_data.size() and
std::equal(pdu_view.begin(), pdu_view.end(), encoded_data.begin()));
TESTASSERT(tenb_pdcp.last_rnti == rnti2 and tenb_pdcp.last_lcid == drb1);
// TEST: verify that MME->TeNB packets are buffered until SeNB->TeNB tunnel is closed
tenb_pdcp.clear();
size_t N_pdus = std::uniform_int_distribution<size_t>{1, 30}(g);
for (size_t i = 0; i < N_pdus; ++i) {
std::fill(data_vec.begin(), data_vec.end(), i);
pdu = encode_gtpu_packet(data_vec, senb_teid_in, sgw_sockaddr, tenb_sockaddr);
tenb_gtpu.handle_gtpu_s1u_rx_packet(std::move(pdu), sgw_sockaddr);
// The PDUs are being buffered
TESTASSERT(tenb_pdcp.last_sdu == nullptr);
}
// PDUs coming from SeNB-TeNB tunnel are forwarded
std::iota(data_vec.begin(), data_vec.end(), 0);
std::shuffle(data_vec.begin(), data_vec.end(), g);
pdu = encode_gtpu_packet(data_vec, senb_teid_in, sgw_sockaddr, senb_sockaddr);
encoded_data.assign(pdu->msg + 8u, pdu->msg + pdu->N_bytes);
senb_gtpu.handle_gtpu_s1u_rx_packet(std::move(pdu), sgw_sockaddr);
tenb_gtpu.handle_gtpu_s1u_rx_packet(read_socket(tenb_rx_sockets.s1u_fd), senb_sockaddr);
TESTASSERT(tenb_pdcp.last_sdu->N_bytes == encoded_data.size() and
memcmp(tenb_pdcp.last_sdu->msg, encoded_data.data(), encoded_data.size()) == 0);
tenb_pdcp.clear();
TESTASSERT(tenb_pdcp.last_sdu == nullptr);
if (event == tunnel_test_event::wait_end_marker_timeout) {
// TEST: EndMarker does not reach TeNB, but there is a timeout that will resume the new GTPU tunnel
for (size_t i = 0; i < gtpu_args.indirect_tunnel_timeout_msec + 1; ++i) {
task_sched.tic();
}
} else {
// TEST: EndMarker is forwarded via MME->SeNB->TeNB, and TeNB buffered PDUs are flushed
pdu = encode_end_marker(senb_teid_in);
senb_gtpu.handle_gtpu_s1u_rx_packet(std::move(pdu), sgw_sockaddr);
tenb_gtpu.handle_gtpu_s1u_rx_packet(read_socket(tenb_rx_sockets.s1u_fd), senb_sockaddr);
}
srsran::span<uint8_t> encoded_data2{tenb_pdcp.last_sdu->msg + 20u, tenb_pdcp.last_sdu->msg + 30u};
TESTASSERT(std::all_of(encoded_data2.begin(), encoded_data2.end(), [N_pdus](uint8_t b) { return b == N_pdus - 1; }));
return SRSRAN_SUCCESS;
}
} // namespace srsenb
int main(int argc, char** argv)
{
// Setup logging.
auto& logger = srslog::fetch_basic_logger("GTPU", false);
logger.set_level(srslog::basic_levels::debug);
logger.set_hex_dump_max_size(-1);
// Start the log backend.
srsran::test_init(argc, argv);
srsenb::test_gtpu_tunnel_manager();
TESTASSERT(srsenb::test_gtpu_direct_tunneling(srsenb::tunnel_test_event::success) == SRSRAN_SUCCESS);
TESTASSERT(srsenb::test_gtpu_direct_tunneling(srsenb::tunnel_test_event::wait_end_marker_timeout) == SRSRAN_SUCCESS);
srslog::flush();
srsran::console("Success");
}
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