mirror of https://github.com/PentHertz/srsLTE.git
150 lines
5.0 KiB
C++
150 lines
5.0 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#include <map>
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#include <string.h>
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#include <unordered_map>
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#include "common_enb.h"
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#include "srslte/common/buffer_pool.h"
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#include "srslte/common/threads.h"
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#include "srslte/interfaces/enb_gtpu_interfaces.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/srslog/srslog.h"
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#include <netinet/in.h>
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#ifndef SRSENB_GTPU_H
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#define SRSENB_GTPU_H
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namespace srsenb {
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class pdcp_interface_gtpu;
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class stack_interface_gtpu_lte;
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class gtpu final : public gtpu_interface_rrc, public gtpu_interface_pdcp
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{
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public:
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explicit gtpu(srslog::basic_logger& logger);
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int init(std::string gtp_bind_addr_,
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std::string mme_addr_,
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std::string m1u_multiaddr_,
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std::string m1u_if_addr_,
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pdcp_interface_gtpu* pdcp_,
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stack_interface_gtpu_lte* stack_,
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bool enable_mbsfn = false);
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void stop();
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// gtpu_interface_rrc
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uint32_t add_bearer(uint16_t rnti,
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uint32_t lcid,
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uint32_t addr,
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uint32_t teid_out,
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const bearer_props* props = nullptr) override;
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void set_tunnel_status(uint32_t teidin, bool dl_active) override;
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void rem_bearer(uint16_t rnti, uint32_t lcid) override;
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void mod_bearer_rnti(uint16_t old_rnti, uint16_t new_rnti) override;
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void rem_user(uint16_t rnti) override;
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// gtpu_interface_pdcp
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void write_pdu(uint16_t rnti, uint32_t lcid, srslte::unique_byte_buffer_t pdu) override;
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// stack interface
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void handle_gtpu_s1u_rx_packet(srslte::unique_byte_buffer_t pdu, const sockaddr_in& addr);
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void handle_gtpu_m1u_rx_packet(srslte::unique_byte_buffer_t pdu, const sockaddr_in& addr);
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private:
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static const int GTPU_PORT = 2152;
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void rem_tunnel(uint32_t teidin);
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stack_interface_gtpu_lte* stack = nullptr;
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bool enable_mbsfn = false;
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std::string gtp_bind_addr;
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std::string mme_addr;
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srsenb::pdcp_interface_gtpu* pdcp = nullptr;
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srslog::basic_logger& logger;
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// Class to create
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class m1u_handler
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{
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public:
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explicit m1u_handler(gtpu* gtpu_) : parent(gtpu_), logger(parent->logger) {}
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~m1u_handler();
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m1u_handler(const m1u_handler&) = delete;
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m1u_handler(m1u_handler&&) = delete;
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m1u_handler& operator=(const m1u_handler&) = delete;
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m1u_handler& operator=(m1u_handler&&) = delete;
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bool init(std::string m1u_multiaddr_, std::string m1u_if_addr_);
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void handle_rx_packet(srslte::unique_byte_buffer_t pdu, const sockaddr_in& addr);
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private:
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gtpu* parent = nullptr;
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pdcp_interface_gtpu* pdcp = nullptr;
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srslog::basic_logger& logger;
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std::string m1u_multiaddr;
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std::string m1u_if_addr;
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bool initiated = false;
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int m1u_sd = -1;
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int lcid_counter = 0;
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};
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m1u_handler m1u;
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const uint32_t undefined_pdcp_sn = std::numeric_limits<uint32_t>::max();
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struct tunnel {
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bool dl_enabled = true;
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bool fwd_teid_in_present = false;
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bool prior_teid_in_present = false;
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uint16_t rnti = SRSLTE_INVALID_RNTI;
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uint32_t lcid = SRSENB_N_RADIO_BEARERS;
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uint32_t teid_in = 0;
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uint32_t teid_out = 0;
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uint32_t spgw_addr = 0;
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uint32_t fwd_teid_in = 0; ///< forward Rx SDUs to this TEID
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uint32_t prior_teid_in = 0; ///< buffer bearer SDUs until this TEID receives an End Marker
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std::multimap<uint32_t, srslte::unique_byte_buffer_t> buffer;
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};
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std::unordered_map<uint32_t, tunnel> tunnels;
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std::map<uint16_t, std::array<std::vector<uint32_t>, SRSENB_N_RADIO_BEARERS> > ue_teidin_db;
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// Tx sequence number for signaling messages
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uint32_t tx_seq = 0;
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// Socket file descriptor
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int fd = -1;
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void send_pdu_to_tunnel(tunnel& tx_tun, srslte::unique_byte_buffer_t pdu, int pdcp_sn = -1);
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void echo_response(in_addr_t addr, in_port_t port, uint16_t seq);
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void error_indication(in_addr_t addr, in_port_t port, uint32_t err_teid);
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void end_marker(uint32_t teidin);
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int create_dl_fwd_tunnel(uint32_t rx_teid_in, uint32_t tx_teid_in);
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/****************************************************************************
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* TEID to RNIT/LCID helper functions
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***************************************************************************/
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uint32_t next_teid_in = 0;
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tunnel* get_tunnel(uint32_t teidin);
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srslte::span<uint32_t> get_lcid_teids(uint16_t rnti, uint32_t lcid);
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void log_message(tunnel& tun, bool is_rx, srslte::span<uint8_t> pdu, int pdcp_sn = -1);
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};
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} // namespace srsenb
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#endif // SRSENB_GTPU_H
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