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244 lines
9.9 KiB
C++
244 lines
9.9 KiB
C++
/*
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* Copyright 2013-2019 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#ifndef SRSENB_S1AP_H
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#define SRSENB_S1AP_H
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#include <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/common.h"
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#include "srslte/common/log.h"
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#include "srslte/common/threads.h"
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#include "srslte/interfaces/enb_interfaces.h"
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#include "s1ap_metrics.h"
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#include "srslte/common/network_utils.h"
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#include "srslte/common/stack_procedure.h"
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namespace srsenb {
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typedef struct {
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uint32_t rnti;
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uint32_t eNB_UE_S1AP_ID;
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uint32_t MME_UE_S1AP_ID;
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bool release_requested;
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uint16_t stream_id;
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struct timeval init_timestamp;
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} ue_ctxt_t;
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class s1ap : public s1ap_interface_rrc
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{
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public:
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static const uint32_t ts1_reloc_prep_timeout_ms = 10000;
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static const uint32_t ts1_reloc_overall_timeout_ms = 10000;
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s1ap();
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bool init(s1ap_args_t args_,
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rrc_interface_s1ap* rrc_,
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srslte::log* s1ap_log_,
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srslte::timer_handler* timers_,
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srsenb::stack_interface_s1ap_lte* stack_);
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void stop();
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void get_metrics(s1ap_metrics_t& m);
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// RRC interface
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void
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initial_ue(uint16_t rnti, asn1::s1ap::rrc_establishment_cause_e cause, srslte::unique_byte_buffer_t pdu) override;
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void initial_ue(uint16_t rnti,
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asn1::s1ap::rrc_establishment_cause_e cause,
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srslte::unique_byte_buffer_t pdu,
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uint32_t m_tmsi,
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uint8_t mmec) override;
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void write_pdu(uint16_t rnti, srslte::unique_byte_buffer_t pdu) override;
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bool user_exists(uint16_t rnti) override;
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bool user_release(uint16_t rnti, asn1::s1ap::cause_radio_network_e cause_radio) override;
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void ue_ctxt_setup_complete(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res) override;
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void ue_erab_setup_complete(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res) override;
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bool is_mme_connected() override;
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// void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps);
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// Stack interface
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bool
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handle_mme_rx_msg(srslte::unique_byte_buffer_t pdu, const sockaddr_in& from, const sctp_sndrcvinfo& sri, int flags);
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private:
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static const int MME_PORT = 36412;
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static const int ADDR_FAMILY = AF_INET;
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static const int SOCK_TYPE = SOCK_STREAM;
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static const int PROTO = IPPROTO_SCTP;
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static const int PPID = 18;
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static const int NONUE_STREAM_ID = 0;
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// args
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rrc_interface_s1ap* rrc = nullptr;
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s1ap_args_t args;
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srslte::log* s1ap_log = nullptr;
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srslte::byte_buffer_pool* pool = nullptr;
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srsenb::stack_interface_s1ap_lte* stack = nullptr;
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srslte::socket_handler_t s1ap_socket;
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struct sockaddr_in mme_addr = {}; // MME address
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bool mme_connected = false;
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bool running = false;
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uint32_t next_eNB_UE_S1AP_ID = 1; // Next ENB-side UE identifier
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uint16_t next_ue_stream_id = 1; // Next UE SCTP stream identifier
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srslte::timer_handler::unique_timer mme_connect_timer, s1setup_timeout;
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// Protocol IEs sent with every UL S1AP message
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LIBLTE_S1AP_TAI_STRUCT tai;
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LIBLTE_S1AP_EUTRAN_CGI_STRUCT eutran_cgi;
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asn1::s1ap::s1_setup_resp_s s1setupresponse;
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void build_tai_cgi();
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bool connect_mme();
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bool setup_s1();
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bool sctp_send_s1ap_pdu(const asn1::s1ap::s1ap_pdu_c& tx_pdu, uint32_t rnti, const char* procedure_name);
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bool handle_s1ap_rx_pdu(srslte::byte_buffer_t* pdu);
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bool handle_initiatingmessage(const asn1::s1ap::init_msg_s& msg);
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bool handle_successfuloutcome(const asn1::s1ap::successful_outcome_s& msg);
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bool handle_unsuccessfuloutcome(const asn1::s1ap::unsuccessful_outcome_s& msg);
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bool handle_paging(const asn1::s1ap::paging_s& msg);
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bool handle_s1setupresponse(const asn1::s1ap::s1_setup_resp_s& msg);
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bool handle_dlnastransport(const asn1::s1ap::dl_nas_transport_s& msg);
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bool handle_initialctxtsetuprequest(const asn1::s1ap::init_context_setup_request_s& msg);
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bool handle_uectxtreleasecommand(const asn1::s1ap::ue_context_release_cmd_s& msg);
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bool handle_s1setupfailure(const asn1::s1ap::s1_setup_fail_s& msg);
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bool handle_erabsetuprequest(const asn1::s1ap::erab_setup_request_s& msg);
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bool handle_uecontextmodifyrequest(const asn1::s1ap::ue_context_mod_request_s& msg);
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bool send_initialuemessage(uint16_t rnti,
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asn1::s1ap::rrc_establishment_cause_e cause,
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srslte::unique_byte_buffer_t pdu,
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bool has_tmsi,
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uint32_t m_tmsi = 0,
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uint8_t mmec = 0);
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bool send_ulnastransport(uint16_t rnti, srslte::unique_byte_buffer_t pdu);
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bool send_uectxtreleaserequest(uint16_t rnti, const asn1::s1ap::cause_c& cause);
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bool send_uectxtreleasecomplete(uint16_t rnti, uint32_t mme_ue_id, uint32_t enb_ue_id);
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bool send_initial_ctxt_setup_response(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res_);
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bool send_initial_ctxt_setup_failure(uint16_t rnti);
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bool send_erab_setup_response(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res_);
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// bool send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
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bool send_uectxmodifyresp(uint16_t rnti);
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bool send_uectxmodifyfailure(uint16_t rnti, const asn1::s1ap::cause_c& cause);
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// handover
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bool send_ho_required(uint16_t rnti,
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uint32_t target_eci,
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srslte::plmn_id_t target_plmn,
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srslte::unique_byte_buffer_t rrc_container) override;
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bool handle_hopreparationfailure(const asn1::s1ap::ho_prep_fail_s& msg);
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bool handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg);
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bool send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_status_info>& bearer_status_list) override;
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bool find_mme_ue_id(uint32_t mme_ue_id, uint16_t* rnti, uint32_t* enb_ue_id);
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std::string get_cause(const asn1::s1ap::cause_c& c);
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// UE-specific data and procedures
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struct ue {
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//! TS 36.413, Section 8.4.1 - Handover Preparation Procedure
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class ho_prep_proc_t
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{
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public:
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struct ts1_reloc_prep_expired {
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};
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ho_prep_proc_t(s1ap::ue* ue_);
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srslte::proc_outcome_t
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init(uint32_t target_eci_, srslte::plmn_id_t target_plmn_, srslte::unique_byte_buffer_t rrc_container);
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srslte::proc_outcome_t step() { return srslte::proc_outcome_t::yield; }
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srslte::proc_outcome_t react(ts1_reloc_prep_expired e);
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srslte::proc_outcome_t react(const asn1::s1ap::ho_prep_fail_s& msg);
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srslte::proc_outcome_t react(const asn1::s1ap::ho_cmd_s& msg);
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void then(const srslte::proc_state_t& result);
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const char* name() { return "HandoverPreparation"; }
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private:
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s1ap::ue* ue_ptr = nullptr;
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s1ap* s1ap_ptr = nullptr;
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uint32_t target_eci = 0;
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srslte::plmn_id_t target_plmn;
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srslte::unique_byte_buffer_t rrc_container;
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};
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explicit ue(uint16_t rnti, s1ap* s1ap_ptr_);
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ue_ctxt_t& get_ctxt() { return ctxt; }
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srslte::proc_t<ho_prep_proc_t>& get_ho_prep_proc() { return ho_prep_proc; }
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bool send_enb_status_transfer_proc(std::vector<bearer_status_info>& bearer_status_list);
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private:
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bool
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send_ho_required(uint32_t target_eci_, srslte::plmn_id_t target_plmn_, srslte::unique_byte_buffer_t rrc_container);
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//! TS 36.413, Section 8.4.6 - eNB Status Transfer procedure
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s1ap* s1ap_ptr;
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srslte::log* s1ap_log;
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ue_ctxt_t ctxt = {};
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srslte::timer_handler::unique_timer ts1_reloc_prep; ///< TS1_{RELOCprep} - max time for HO preparation
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srslte::timer_handler::unique_timer ts1_reloc_overall; ///< TS1_{RELOCOverall}
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// user procedures
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srslte::proc_t<ho_prep_proc_t> ho_prep_proc;
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};
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std::map<uint16_t, std::unique_ptr<ue> > users;
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std::map<uint32_t, uint16_t> enbid_to_rnti_map;
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ue_ctxt_t* get_user_ctxt(uint16_t rnti);
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// timers
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srslte::timer_handler* timers = nullptr;
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// procedures
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class s1_setup_proc_t
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{
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public:
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struct s1setupresult {
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bool success = false;
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enum class cause_t { timeout, failure } cause;
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};
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explicit s1_setup_proc_t(s1ap* s1ap_) : s1ap_ptr(s1ap_) {}
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srslte::proc_outcome_t init();
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srslte::proc_outcome_t step() { return srslte::proc_outcome_t::yield; }
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srslte::proc_outcome_t react(const s1setupresult& event);
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void then(const srslte::proc_state_t& result) const;
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const char* name() const { return "MME Connection"; }
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private:
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srslte::proc_outcome_t start_mme_connection();
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s1ap* s1ap_ptr = nullptr;
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};
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srslte::proc_t<s1_setup_proc_t> s1setup_proc;
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};
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} // namespace srsenb
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#endif // SRSENB_S1AP_H
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