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203 lines
8.4 KiB
C++
203 lines
8.4 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 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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#ifndef SRSUE_NAS_5G_H
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#define SRSUE_NAS_5G_H
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#include "nas_base.h"
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#include "srsran/asn1/nas_5g_ies.h"
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#include "srsran/asn1/nas_5g_msg.h"
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#include "srsran/common/buffer_pool.h"
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#include "srsran/common/common.h"
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#include "srsran/common/nas_pcap.h"
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#include "srsran/common/security.h"
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#include "srsran/common/stack_procedure.h"
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#include "srsran/common/task_scheduler.h"
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#include "srsran/interfaces/ue_gw_interfaces.h"
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#include "srsran/interfaces/ue_nas_interfaces.h"
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#include "srsran/interfaces/ue_rrc_interfaces.h"
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#include "srsran/interfaces/ue_usim_interfaces.h"
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#include "srsran/srslog/srslog.h"
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#include "srsue/hdr/stack/upper/nas_5g_metrics.h"
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#include "srsue/hdr/stack/upper/nas_5gmm_state.h"
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#include "srsue/hdr/stack/upper/nas_config.h"
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using srsran::byte_buffer_t;
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#define MAX_PDU_SESSIONS 15
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#define MAX_TRANS_ID 255
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namespace srsue {
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/**
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* @brief This class implements the NAS layer of a 5G UE.
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*
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* The class is *NOT* thread-safe.
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*
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*/
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class nas_5g : public nas_base, public nas_5g_interface_rrc_nr, public nas_5g_interface_procedures
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{
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public:
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explicit nas_5g(srslog::basic_logger& logger_, srsran::task_sched_handle task_sched_);
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virtual ~nas_5g();
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int init(usim_interface_nas* usim_,
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rrc_nr_interface_nas_5g* rrc_nr_,
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gw_interface_nas* gw_,
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const nas_5g_args_t& cfg_);
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void stop();
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void run_tti();
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// Stack+RRC interface
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bool is_registered();
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int get_k_amf(srsran::as_key_t& k_amf);
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uint32_t get_ul_nas_count();
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int write_pdu(srsran::unique_byte_buffer_t pdu);
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// timer callback
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void timer_expired(uint32_t timeout_id);
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// Stack interface
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int switch_on();
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int switch_off();
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int enable_data();
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int disable_data();
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int start_service_request();
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// Metrics getter
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void get_metrics(nas_5g_metrics_t& metrics);
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private:
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rrc_nr_interface_nas_5g* rrc_nr = nullptr;
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usim_interface_nas* usim = nullptr;
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gw_interface_nas* gw = nullptr;
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bool running = false;
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bool has_sec_ctxt = false;
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bool initial_sec_command = false;
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srsran::nas_5g::mobile_identity_5gs_t::guti_5g_s guti_5g;
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srsran::nas_5g::nas_5gs_msg initial_registration_request_stored;
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nas_5g_args_t cfg = {};
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mm5g_state_t state;
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// Security
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bool ia5g_caps[8] = {};
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bool ea5g_caps[8] = {};
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void set_k_gnb_count(uint32_t count);
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// TS 23.003 Sec. 6.2.2 IMEISV's last two octets are Software Version Number (SVN)
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// which identifies the software version number of the mobile equipment
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const uint8_t ue_svn_oct1 = 0x5;
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const uint8_t ue_svn_oct2 = 0x3;
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// timers
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srsran::task_sched_handle task_sched;
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srsran::timer_handler::unique_timer t3502; // started when registration failure and the attempt counter is equal to 5
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srsran::timer_handler::unique_timer t3510; // started when transmission of REGISTRATION REQUEST message. ON EXPIRY:
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// start T3511 or T3502 as specified in subclause 5.5.1.2.7
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srsran::timer_handler::unique_timer t3511; // started when registration failure due to lower layer failure
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srsran::timer_handler::unique_timer t3521; // started when detach request is sent
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srsran::timer_handler::unique_timer reregistration_timer; // started to trigger delayed re-attach
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// Values according to TS 24.501 Sec 10.2
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const uint32_t t3502_duration_ms = 12 * 60 * 1000; // 12m
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const uint32_t t3510_duration_ms = 15 * 1000; // 15s
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const uint32_t t3511_duration_ms = 10 * 1000; // 10s
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const uint32_t t3521_duration_ms = 15 * 1000; // 15s
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const uint32_t reregistration_timer_duration_ms = 2 * 1000; // 2s (arbitrarily chosen to delay re-attach)
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srsran::proc_manager_list_t callbacks;
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// Procedures
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// Forward declartion
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class registration_procedure;
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class pdu_session_establishment_procedure;
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srsran::proc_t<registration_procedure> registration_proc;
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srsran::proc_t<pdu_session_establishment_procedure> pdu_session_establishment_proc;
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// Network information
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srsran::nas_5g::network_name_t full_network_name;
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// Message sender
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int send_registration_request();
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int send_authentication_response(const uint8_t res[16]);
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int send_security_mode_reject(const srsran::nas_5g::cause_5gmm_t::cause_5gmm_type_::options cause);
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int send_authentication_failure(const srsran::nas_5g::cause_5gmm_t::cause_5gmm_type_::options cause,
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const uint8_t res_star[16]);
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int send_security_mode_complete(const srsran::nas_5g::security_mode_command_t& security_mode_command);
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int send_registration_complete();
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int send_pdu_session_establishment_request(uint32_t transaction_identity,
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uint16_t pdu_session_id,
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const pdu_session_cfg_t& pdu_session);
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int send_deregistration_request_ue_originating(bool switch_off);
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int send_identity_response(srsran::nas_5g::identity_type_5gs_t::identity_types_::options requested_identity_type);
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int send_configuration_update_complete();
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// Helper functions
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void fill_security_caps(srsran::nas_5g::ue_security_capability_t& sec_caps);
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int apply_security_config(srsran::unique_byte_buffer_t& pdu, uint8_t sec_hdr_type);
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bool check_replayed_ue_security_capabilities(srsran::nas_5g::ue_security_capability_t& caps);
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void set_nssai(srsran::nas_5g::s_nssai_t& s_nssai);
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// message handler
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int handle_registration_accept(srsran::nas_5g::registration_accept_t& registration_accept);
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int handle_registration_reject(srsran::nas_5g::registration_reject_t& registration_reject);
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int handle_authentication_request(srsran::nas_5g::authentication_request_t& authentication_request);
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int handle_authentication_reject(srsran::nas_5g::authentication_reject_t& authentication_reject);
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int handle_identity_request(srsran::nas_5g::identity_request_t& identity_request);
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int handle_service_accept(srsran::nas_5g::service_accept_t& service_accept);
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int handle_service_reject(srsran::nas_5g::service_reject_t& service_reject);
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int handle_security_mode_command(srsran::nas_5g::security_mode_command_t& security_mode_command,
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srsran::unique_byte_buffer_t pdu);
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int handle_deregistration_accept_ue_terminated(
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srsran::nas_5g::deregistration_accept_ue_terminated_t& deregistration_accept_ue_terminated);
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int handle_deregistration_accept_ue_originating(
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srsran::nas_5g::deregistration_accept_ue_originating_t& deregistration_accept_ue_originating);
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int handle_deregistration_request_ue_terminated(
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srsran::nas_5g::deregistration_request_ue_terminated_t& deregistration_request_ue_terminated);
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int handle_configuration_update_command(srsran::nas_5g::configuration_update_command_t& configuration_update_command);
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int handle_dl_nas_transport(srsran::nas_5g::dl_nas_transport_t& dl_nas_transport);
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// message handler container
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int handle_n1_sm_information(std::vector<uint8_t> payload_container_contents);
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// Transaction ID management
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std::array<bool, MAX_TRANS_ID> pdu_trans_ids;
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uint32_t allocate_next_proc_trans_id();
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void release_proc_trans_id(uint32_t proc_id);
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int trigger_pdu_session_est();
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// PDU Session Management
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int add_pdu_session(uint16_t pdu_session_id, uint16_t pdu_session_type, srsran::nas_5g::pdu_address_t pdu_address);
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int init_pdu_sessions(std::vector<pdu_session_cfg_t> pdu_session_cfgs);
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int configure_pdu_session(uint16_t pdu_session_id);
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bool unestablished_pdu_sessions();
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int get_unestablished_pdu_session(uint16_t& pdu_session_id, pdu_session_cfg_t& pdu_session_cfg);
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int reset_pdu_sessions();
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uint32_t num_of_est_pdu_sessions();
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struct pdu_session_t {
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bool configured;
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bool established;
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uint16_t pdu_session_id;
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pdu_session_cfg_t pdu_session_cfg;
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};
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std::array<pdu_session_t, MAX_PDU_SESSIONS> pdu_sessions;
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};
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} // namespace srsue
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#endif |