155 lines
6.0 KiB
C++
155 lines
6.0 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 "srslte/common/buffer_pool.h"
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#include "srslte/common/log.h"
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#include "srslte/common/common.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 "common_enb.h"
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#include "srslte/asn1/liblte_s1ap.h"
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#include "s1ap_metrics.h"
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namespace srsenb {
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typedef struct {
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uint32_t enb_id; // 20-bit id (lsb bits)
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uint8_t cell_id; // 8-bit cell id
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uint16_t tac; // 16-bit tac
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uint16_t mcc; // BCD-coded with 0xF filler
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uint16_t mnc; // BCD-coded with 0xF filler
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std::string mme_addr;
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std::string gtp_bind_addr;
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std::string s1c_bind_addr;
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std::string enb_name;
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}s1ap_args_t;
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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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}ue_ctxt_t;
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class s1ap
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:public s1ap_interface_rrc
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,public thread
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{
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public:
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bool init(s1ap_args_t args_, rrc_interface_s1ap *rrc_, srslte::log *s1ap_log_);
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void stop();
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void get_metrics(s1ap_metrics_t &m);
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void run_thread();
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// RRC interface
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void initial_ue(uint16_t rnti, LIBLTE_S1AP_RRC_ESTABLISHMENT_CAUSE_ENUM cause, srslte::unique_byte_buffer pdu);
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void initial_ue(uint16_t rnti,
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LIBLTE_S1AP_RRC_ESTABLISHMENT_CAUSE_ENUM cause,
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srslte::unique_byte_buffer pdu,
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uint32_t m_tmsi,
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uint8_t mmec);
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void write_pdu(uint16_t rnti, srslte::unique_byte_buffer pdu);
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bool user_exists(uint16_t rnti);
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bool user_release(uint16_t rnti, LIBLTE_S1AP_CAUSERADIONETWORK_ENUM cause_radio);
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void ue_ctxt_setup_complete(uint16_t rnti, LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPRESPONSE_STRUCT *res);
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void ue_erab_setup_complete(uint16_t rnti, LIBLTE_S1AP_MESSAGE_E_RABSETUPRESPONSE_STRUCT *res);
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bool is_mme_connected();
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//void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps);
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private:
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static const int S1AP_THREAD_PRIO = 65;
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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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rrc_interface_s1ap *rrc;
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s1ap_args_t args;
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srslte::log *s1ap_log;
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srslte::byte_buffer_pool *pool;
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bool mme_connected;
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bool running;
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int socket_fd; // SCTP socket file descriptor
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struct sockaddr_in mme_addr; // MME address
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uint32_t next_eNB_UE_S1AP_ID; // Next ENB-side UE identifier
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uint16_t next_ue_stream_id; // Next UE SCTP stream identifier
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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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LIBLTE_S1AP_MESSAGE_S1SETUPRESPONSE_STRUCT s1setupresponse;
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std::map<uint16_t, ue_ctxt_t> ue_ctxt_map;
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std::map<uint32_t, uint16_t> enbid_to_rnti_map;
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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 handle_s1ap_rx_pdu(srslte::byte_buffer_t* pdu);
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bool handle_initiatingmessage(LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *msg);
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bool handle_successfuloutcome(LIBLTE_S1AP_SUCCESSFULOUTCOME_STRUCT *msg);
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bool handle_unsuccessfuloutcome(LIBLTE_S1AP_UNSUCCESSFULOUTCOME_STRUCT *msg);
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bool handle_paging(LIBLTE_S1AP_MESSAGE_PAGING_STRUCT *msg);
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bool handle_s1setupresponse(LIBLTE_S1AP_MESSAGE_S1SETUPRESPONSE_STRUCT *msg);
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bool handle_dlnastransport(LIBLTE_S1AP_MESSAGE_DOWNLINKNASTRANSPORT_STRUCT *msg);
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bool handle_initialctxtsetuprequest(LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT *msg);
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bool handle_uectxtreleasecommand(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASECOMMAND_STRUCT *msg);
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bool handle_s1setupfailure(LIBLTE_S1AP_MESSAGE_S1SETUPFAILURE_STRUCT *msg);
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bool handle_erabsetuprequest(LIBLTE_S1AP_MESSAGE_E_RABSETUPREQUEST_STRUCT *msg);
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bool send_initialuemessage(uint16_t rnti,
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LIBLTE_S1AP_RRC_ESTABLISHMENT_CAUSE_ENUM cause,
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srslte::unique_byte_buffer 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 pdu);
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bool send_uectxtreleaserequest(uint16_t rnti, LIBLTE_S1AP_CAUSE_STRUCT *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, LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPRESPONSE_STRUCT *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, LIBLTE_S1AP_MESSAGE_E_RABSETUPRESPONSE_STRUCT *res_);
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//bool send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
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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(LIBLTE_S1AP_CAUSE_STRUCT *c);
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};
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} // namespace srsenb
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#endif // SRSENB_S1AP_H
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