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srsLTE/srsenb/hdr/stack/upper/s1ap.h

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/*
* Copyright 2013-2019 Software Radio Systems Limited
*
* This file is part of srsLTE.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#ifndef SRSENB_S1AP_H
#define SRSENB_S1AP_H
#include <map>
#include "common_enb.h"
#include "srslte/common/buffer_pool.h"
#include "srslte/common/common.h"
#include "srslte/common/logmap.h"
#include "srslte/common/threads.h"
#include "srslte/interfaces/enb_interfaces.h"
#include "s1ap_metrics.h"
#include "srslte/common/network_utils.h"
#include "srslte/common/stack_procedure.h"
#include <unordered_map>
namespace srsenb {
struct ue_ctxt_t {
static const uint32_t invalid_enb_id = std::numeric_limits<uint32_t>::max();
bool mme_ue_s1ap_id_present = false;
uint16_t rnti = SRSLTE_INVALID_RNTI;
uint32_t enb_ue_s1ap_id = invalid_enb_id;
uint32_t mme_ue_s1ap_id = 0;
struct timeval init_timestamp = {};
};
class s1ap : public s1ap_interface_rrc
{
public:
static const uint32_t ts1_reloc_prep_timeout_ms = 10000;
static const uint32_t ts1_reloc_overall_timeout_ms = 10000;
s1ap();
bool init(s1ap_args_t args_,
rrc_interface_s1ap* rrc_,
srslte::timer_handler* timers_,
srsenb::stack_interface_s1ap_lte* stack_);
void stop();
void get_metrics(s1ap_metrics_t& m);
// RRC interface
void
initial_ue(uint16_t rnti, asn1::s1ap::rrc_establishment_cause_e cause, srslte::unique_byte_buffer_t pdu) override;
void initial_ue(uint16_t rnti,
asn1::s1ap::rrc_establishment_cause_e cause,
srslte::unique_byte_buffer_t pdu,
uint32_t m_tmsi,
uint8_t mmec) override;
void write_pdu(uint16_t rnti, srslte::unique_byte_buffer_t pdu) override;
bool user_exists(uint16_t rnti) override;
bool user_release(uint16_t rnti, asn1::s1ap::cause_radio_network_e cause_radio) override;
void ue_ctxt_setup_complete(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res) override;
void ue_erab_setup_complete(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res) override;
bool is_mme_connected() override;
bool send_ho_required(uint16_t rnti,
uint32_t target_eci,
srslte::plmn_id_t target_plmn,
srslte::unique_byte_buffer_t rrc_container) override;
bool send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_status_info>& bearer_status_list) override;
// void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps);
// Stack interface
bool
handle_mme_rx_msg(srslte::unique_byte_buffer_t pdu, const sockaddr_in& from, const sctp_sndrcvinfo& sri, int flags);
private:
static const int MME_PORT = 36412;
static const int ADDR_FAMILY = AF_INET;
static const int SOCK_TYPE = SOCK_STREAM;
static const int PROTO = IPPROTO_SCTP;
static const int PPID = 18;
static const int NONUE_STREAM_ID = 0;
// args
rrc_interface_s1ap* rrc = nullptr;
s1ap_args_t args;
srslte::log_ref s1ap_log;
srslte::byte_buffer_pool* pool = nullptr;
srsenb::stack_interface_s1ap_lte* stack = nullptr;
srslte::socket_handler_t s1ap_socket;
struct sockaddr_in mme_addr = {}; // MME address
bool mme_connected = false;
bool running = false;
uint32_t next_enb_ue_s1ap_id = 1; // Next ENB-side UE identifier
uint16_t next_ue_stream_id = 1; // Next UE SCTP stream identifier
srslte::timer_handler::unique_timer mme_connect_timer, s1setup_timeout;
// Protocol IEs sent with every UL S1AP message
LIBLTE_S1AP_TAI_STRUCT tai;
LIBLTE_S1AP_EUTRAN_CGI_STRUCT eutran_cgi;
asn1::s1ap::s1_setup_resp_s s1setupresponse;
void build_tai_cgi();
bool connect_mme();
bool setup_s1();
bool sctp_send_s1ap_pdu(const asn1::s1ap::s1ap_pdu_c& tx_pdu, uint32_t rnti, const char* procedure_name);
bool handle_s1ap_rx_pdu(srslte::byte_buffer_t* pdu);
bool handle_initiatingmessage(const asn1::s1ap::init_msg_s& msg);
bool handle_successfuloutcome(const asn1::s1ap::successful_outcome_s& msg);
bool handle_unsuccessfuloutcome(const asn1::s1ap::unsuccessful_outcome_s& msg);
bool handle_paging(const asn1::s1ap::paging_s& msg);
bool handle_s1setupresponse(const asn1::s1ap::s1_setup_resp_s& msg);
bool handle_dlnastransport(const asn1::s1ap::dl_nas_transport_s& msg);
bool handle_initialctxtsetuprequest(const asn1::s1ap::init_context_setup_request_s& msg);
bool handle_uectxtreleasecommand(const asn1::s1ap::ue_context_release_cmd_s& msg);
bool handle_s1setupfailure(const asn1::s1ap::s1_setup_fail_s& msg);
bool handle_erabsetuprequest(const asn1::s1ap::erab_setup_request_s& msg);
bool handle_uecontextmodifyrequest(const asn1::s1ap::ue_context_mod_request_s& msg);
// bool send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
// handover
bool handle_hopreparationfailure(const asn1::s1ap::ho_prep_fail_s& msg);
bool handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg);
// UE-specific data and procedures
struct ue {
//! TS 36.413, Section 8.4.1 - Handover Preparation Procedure
class ho_prep_proc_t
{
public:
struct ts1_reloc_prep_expired {
};
ho_prep_proc_t(s1ap::ue* ue_);
srslte::proc_outcome_t
init(uint32_t target_eci_, srslte::plmn_id_t target_plmn_, srslte::unique_byte_buffer_t rrc_container);
srslte::proc_outcome_t step() { return srslte::proc_outcome_t::yield; }
srslte::proc_outcome_t react(ts1_reloc_prep_expired e);
srslte::proc_outcome_t react(const asn1::s1ap::ho_prep_fail_s& msg);
srslte::proc_outcome_t react(const asn1::s1ap::ho_cmd_s& msg);
void then(const srslte::proc_state_t& result);
const char* name() { return "HandoverPreparation"; }
private:
s1ap::ue* ue_ptr = nullptr;
s1ap* s1ap_ptr = nullptr;
uint32_t target_eci = 0;
srslte::plmn_id_t target_plmn;
srslte::unique_byte_buffer_t rrc_container;
};
explicit ue(s1ap* s1ap_ptr_);
bool send_enb_status_transfer_proc(std::vector<bearer_status_info>& bearer_status_list);
bool send_ulnastransport(srslte::unique_byte_buffer_t pdu);
bool send_uectxtreleaserequest(const asn1::s1ap::cause_c& cause);
bool send_uectxtmodifyfailure(const asn1::s1ap::cause_c& cause);
bool send_uectxtmodifyresp();
bool send_uectxtreleasecomplete();
bool send_initialuemessage(asn1::s1ap::rrc_establishment_cause_e cause,
srslte::unique_byte_buffer_t pdu,
bool has_tmsi,
uint32_t m_tmsi = 0,
uint8_t mmec = 0);
bool send_initial_ctxt_setup_response(const asn1::s1ap::init_context_setup_resp_s& res_);
bool send_initial_ctxt_setup_failure();
bool send_erab_setup_response(const asn1::s1ap::erab_setup_resp_s& res_);
bool was_uectxtrelease_requested() const { return release_requested; }
ue_ctxt_t ctxt = {};
uint16_t stream_id = 1;
// user procedures
srslte::proc_t<ho_prep_proc_t> ho_prep_proc;
private:
bool
send_ho_required(uint32_t target_eci_, srslte::plmn_id_t target_plmn_, srslte::unique_byte_buffer_t rrc_container);
//! TS 36.413, Section 8.4.6 - eNB Status Transfer procedure
// args
s1ap* s1ap_ptr;
srslte::log_ref s1ap_log;
// state
bool release_requested = false;
srslte::timer_handler::unique_timer ts1_reloc_prep; ///< TS1_{RELOCprep} - max time for HO preparation
srslte::timer_handler::unique_timer ts1_reloc_overall; ///< TS1_{RELOCOverall}
};
class user_list
{
public:
using value_type = std::unique_ptr<ue>;
using iterator = std::unordered_map<uint32_t, value_type>::iterator;
using const_iterator = std::unordered_map<uint32_t, value_type>::const_iterator;
using pair_type = std::unordered_map<uint32_t, value_type>::value_type;
ue* find_ue_rnti(uint16_t rnti);
ue* find_ue_enbid(uint32_t enbid);
ue* find_ue_mmeid(uint32_t mmeid);
ue* add_user(value_type user);
void erase(ue* ue_ptr);
iterator begin() { return users.begin(); }
iterator end() { return users.end(); }
const_iterator cbegin() const { return users.begin(); }
const_iterator cend() const { return users.end(); }
size_t size() const { return users.size(); }
private:
std::unordered_map<uint32_t, std::unique_ptr<ue> > users; // maps ENB_S1AP_ID to user
};
user_list users;
// timers
srslte::timer_handler* timers = nullptr;
// procedures
class s1_setup_proc_t
{
public:
struct s1setupresult {
bool success = false;
enum class cause_t { timeout, failure } cause;
};
explicit s1_setup_proc_t(s1ap* s1ap_) : s1ap_ptr(s1ap_) {}
srslte::proc_outcome_t init();
srslte::proc_outcome_t step() { return srslte::proc_outcome_t::yield; }
srslte::proc_outcome_t react(const s1setupresult& event);
void then(const srslte::proc_state_t& result) const;
const char* name() const { return "MME Connection"; }
private:
srslte::proc_outcome_t start_mme_connection();
s1ap* s1ap_ptr = nullptr;
};
ue* find_s1apmsg_user(uint32_t enb_id, uint32_t mme_id);
std::string get_cause(const asn1::s1ap::cause_c& c);
srslte::proc_t<s1_setup_proc_t> s1setup_proc;
};
} // namespace srsenb
#endif // SRSENB_S1AP_H
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