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srsRAN/srsenb/src/stack/upper/s1ap.cc

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/*
* Copyright 2013-2020 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/.
*
*/
#include "srsenb/hdr/stack/upper/s1ap.h"
#include "srsenb/hdr/stack/upper/common_enb.h"
#include "srslte/common/bcd_helpers.h"
#include "srslte/common/int_helpers.h"
#include "srslte/common/logmap.h"
#include <arpa/inet.h> //for inet_ntop()
#include <inttypes.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h> //for close(), sleep()
using srslte::s1ap_mccmnc_to_plmn;
using srslte::uint32_to_uint8;
#define procError(fmt, ...) s1ap_ptr->s1ap_log->error("Proc \"%s\" - " fmt, name(), ##__VA_ARGS__)
#define procWarning(fmt, ...) s1ap_ptr->s1ap_log->warning("Proc \"%s\" - " fmt, name(), ##__VA_ARGS__)
#define procInfo(fmt, ...) s1ap_ptr->s1ap_log->info("Proc \"%s\" - " fmt, name(), ##__VA_ARGS__)
using namespace asn1::s1ap;
namespace srsenb {
/*********************************************************
* TS 36.413 - Section 8.4.1 - "Handover Preparation"
*********************************************************/
s1ap::ue::ho_prep_proc_t::ho_prep_proc_t(s1ap::ue* ue_) : ue_ptr(ue_), s1ap_ptr(ue_->s1ap_ptr) {}
srslte::proc_outcome_t s1ap::ue::ho_prep_proc_t::init(uint32_t target_eci_,
srslte::plmn_id_t target_plmn_,
srslte::unique_byte_buffer_t rrc_container_)
{
target_eci = target_eci_;
target_plmn = target_plmn_;
procInfo("Sending HandoverRequired to MME id=%d\n", ue_ptr->ctxt.mme_ue_s1ap_id);
if (not ue_ptr->send_ho_required(target_eci, target_plmn, std::move(rrc_container_))) {
procError("Failed to send HORequired to cell 0x%x\n", target_eci);
return srslte::proc_outcome_t::error;
}
// Start HO preparation timer
ue_ptr->ts1_reloc_prep.run();
return srslte::proc_outcome_t::yield;
}
srslte::proc_outcome_t s1ap::ue::ho_prep_proc_t::react(ts1_reloc_prep_expired e)
{
// do nothing for now
procError("timer TS1Relocprep has expired.\n");
return srslte::proc_outcome_t::error;
}
srslte::proc_outcome_t s1ap::ue::ho_prep_proc_t::react(const ho_prep_fail_s& msg)
{
ue_ptr->ts1_reloc_prep.stop();
std::string cause = s1ap_ptr->get_cause(msg.protocol_ies.cause.value);
procError("HO preparation Failure. Cause: %s\n", cause.c_str());
s1ap_ptr->s1ap_log->console("HO preparation Failure. Cause: %s\n", cause.c_str());
return srslte::proc_outcome_t::error;
}
/**
* TS 36.413 - Section 8.4.1.2 - HandoverPreparation Successful Operation
* Description: MME returns back an HandoverCommand to the SeNB
*/
srslte::proc_outcome_t s1ap::ue::ho_prep_proc_t::react(const asn1::s1ap::ho_cmd_s& msg)
{
// update timers
ue_ptr->ts1_reloc_prep.stop();
ue_ptr->ts1_reloc_overall.run();
// Check for unsupported S1AP fields
if (msg.ext or msg.protocol_ies.target_to_source_transparent_container_secondary_present or
msg.protocol_ies.handov_type.value.value != handov_type_opts::intralte or
msg.protocol_ies.crit_diagnostics_present or msg.protocol_ies.nas_security_paramsfrom_e_utran_present) {
procWarning("Not handling HandoverCommand extensions and non-intraLTE params\n");
}
// Check for E-RABs that could not be admitted in the target
if (msg.protocol_ies.erab_to_release_list_ho_cmd_present) {
procWarning("Not handling E-RABtoReleaseList\n");
// TODO
}
// Check for E-RABs subject to being forwarded
if (msg.protocol_ies.erab_subjectto_data_forwarding_list_present) {
procWarning("Not handling E-RABSubjecttoDataForwardingList\n");
// TODO
}
// In case of intra-system Handover, Target to Source Transparent Container IE shall be encoded as
// Target eNB to Source eNB Transparent Container IE
asn1::cbit_ref bref(msg.protocol_ies.target_to_source_transparent_container.value.data(),
msg.protocol_ies.target_to_source_transparent_container.value.size());
asn1::s1ap::targetenb_to_sourceenb_transparent_container_s container;
if (container.unpack(bref) != asn1::SRSASN_SUCCESS) {
procError("Failed to decode TargeteNBToSourceeNBTransparentContainer\n");
return srslte::proc_outcome_t::error;
}
if (container.ie_exts_present or container.ext) {
procWarning("Not handling extensions\n");
}
// Create a unique buffer out of transparent container to pass to RRC
rrc_container = srslte::allocate_unique_buffer(*s1ap_ptr->pool, false);
if (rrc_container == nullptr) {
procError("Fatal Error: Couldn't allocate buffer.\n");
return srslte::proc_outcome_t::error;
}
memcpy(rrc_container->msg, container.rrc_container.data(), container.rrc_container.size());
rrc_container->N_bytes = container.rrc_container.size();
return srslte::proc_outcome_t::success;
}
void s1ap::ue::ho_prep_proc_t::then(const srslte::proc_state_t& result)
{
if (result.is_error()) {
s1ap_ptr->rrc->ho_preparation_complete(ue_ptr->ctxt.rnti, false, {});
} else {
s1ap_ptr->rrc->ho_preparation_complete(ue_ptr->ctxt.rnti, true, std::move(rrc_container));
procInfo("Completed with success\n");
}
}
/*********************************************************
* MME Connection
*********************************************************/
srslte::proc_outcome_t s1ap::s1_setup_proc_t::init()
{
procInfo("Starting new MME connection.\n");
return start_mme_connection();
}
srslte::proc_outcome_t s1ap::s1_setup_proc_t::start_mme_connection()
{
if (not s1ap_ptr->running) {
procInfo("S1AP is not running anymore.\n");
return srslte::proc_outcome_t::error;
}
if (s1ap_ptr->mme_connected) {
procInfo("eNB S1AP is already connected to MME\n");
return srslte::proc_outcome_t::success;
}
if (not s1ap_ptr->connect_mme()) {
procError("Failed to initiate SCTP socket. Attempting reconnection in %d seconds\n",
s1ap_ptr->mme_connect_timer.duration() / 1000);
s1ap_ptr->s1ap_log->console("Failed to initiate SCTP socket. Attempting reconnection in %d seconds\n",
s1ap_ptr->mme_connect_timer.duration() / 1000);
s1ap_ptr->mme_connect_timer.run();
return srslte::proc_outcome_t::error;
}
if (not s1ap_ptr->setup_s1()) {
procError("S1 setup failed. Exiting...\n");
s1ap_ptr->s1ap_log->console("S1 setup failed\n");
s1ap_ptr->running = false;
return srslte::proc_outcome_t::error;
}
s1ap_ptr->s1setup_timeout.run();
procInfo("S1SetupRequest sent. Waiting for response...\n");
return srslte::proc_outcome_t::yield;
}
srslte::proc_outcome_t s1ap::s1_setup_proc_t::react(const srsenb::s1ap::s1_setup_proc_t::s1setupresult& event)
{
if (s1ap_ptr->s1setup_timeout.is_running()) {
s1ap_ptr->s1setup_timeout.stop();
}
if (event.success) {
procInfo("S1Setup procedure completed successfully\n");
return srslte::proc_outcome_t::success;
}
procError("S1Setup failed. Exiting...\n");
s1ap_ptr->s1ap_log->console("S1setup failed\n");
return srslte::proc_outcome_t::error;
}
void s1ap::s1_setup_proc_t::then(const srslte::proc_state_t& result) const
{
if (result.is_error()) {
s1ap_ptr->s1ap_socket.reset();
procInfo("S1AP socket closed.\n");
}
}
/*********************************************************
* S1AP class
*********************************************************/
s1ap::s1ap() : s1setup_proc(this) {}
int s1ap::init(s1ap_args_t args_,
rrc_interface_s1ap* rrc_,
srslte::timer_handler* timers_,
srsenb::stack_interface_s1ap_lte* stack_)
{
rrc = rrc_;
args = args_;
s1ap_log = srslte::logmap::get("S1AP");
timers = timers_;
stack = stack_;
pool = srslte::byte_buffer_pool::get_instance();
build_tai_cgi();
// Setup MME reconnection timer
mme_connect_timer = timers->get_unique_timer();
auto mme_connect_run = [this](uint32_t tid) {
if (not s1setup_proc.launch()) {
s1ap_log->error("Failed to initiate S1Setup procedure.\n");
}
};
mme_connect_timer.set(10000, mme_connect_run);
// Setup S1Setup timeout
s1setup_timeout = timers->get_unique_timer();
uint32_t s1setup_timeout_val = 5000;
s1setup_timeout.set(s1setup_timeout_val, [this](uint32_t tid) {
s1_setup_proc_t::s1setupresult res;
res.success = false;
res.cause = s1_setup_proc_t::s1setupresult::cause_t::timeout;
s1setup_proc.trigger(res);
});
running = true;
// starting MME connection
if (not s1setup_proc.launch()) {
s1ap_log->error("Failed to initiate S1Setup procedure.\n");
}
return SRSLTE_SUCCESS;
}
void s1ap::stop()
{
running = false;
s1ap_socket.reset();
}
void s1ap::get_metrics(s1ap_metrics_t& m)
{
if (!running) {
m.status = S1AP_ERROR;
return;
}
if (mme_connected) {
m.status = S1AP_READY;
} else {
m.status = S1AP_ATTACHING;
}
}
// Generate common S1AP protocol IEs from config args
void s1ap::build_tai_cgi()
{
uint32_t plmn;
// TAI
s1ap_mccmnc_to_plmn(args.mcc, args.mnc, &plmn);
tai.plm_nid.from_number(plmn);
tai.tac.from_number(args.tac);
// EUTRAN_CGI
eutran_cgi.plm_nid.from_number(plmn);
eutran_cgi.cell_id.from_number((uint32_t)(args.enb_id << 8) | args.cell_id);
}
/*******************************************************************************
/* RRC interface
********************************************************************************/
void s1ap::initial_ue(uint16_t rnti, asn1::s1ap::rrc_establishment_cause_e cause, srslte::unique_byte_buffer_t pdu)
{
std::unique_ptr<ue> ue_ptr{new ue{this}};
ue_ptr->ctxt.rnti = rnti;
ue* u = users.add_user(std::move(ue_ptr));
if (u == nullptr) {
s1ap_log->error("Failed to add rnti=0x%x\n", rnti);
return;
}
u->send_initialuemessage(cause, std::move(pdu), false);
}
void s1ap::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)
{
std::unique_ptr<ue> ue_ptr{new ue{this}};
ue_ptr->ctxt.rnti = rnti;
ue* u = users.add_user(std::move(ue_ptr));
if (u == nullptr) {
s1ap_log->error("Failed to add rnti=0x%x\n", rnti);
return;
}
u->send_initialuemessage(cause, std::move(pdu), true, m_tmsi, mmec);
}
void s1ap::write_pdu(uint16_t rnti, srslte::unique_byte_buffer_t pdu)
{
s1ap_log->info_hex(pdu->msg, pdu->N_bytes, "Received RRC SDU");
ue* u = users.find_ue_rnti(rnti);
if (u == nullptr) {
s1ap_log->info("The rnti=0x%x does not exist\n", rnti);
return;
}
u->send_ulnastransport(std::move(pdu));
}
bool s1ap::user_release(uint16_t rnti, asn1::s1ap::cause_radio_network_e cause_radio)
{
s1ap_log->info("User inactivity - RNTI:0x%x\n", rnti);
ue* u = users.find_ue_rnti(rnti);
if (u == nullptr) {
return false;
}
if (u->was_uectxtrelease_requested()) {
s1ap_log->warning("UE context for RNTI:0x%x is in zombie state. Releasing...\n", rnti);
users.erase(u);
rrc->release_complete(rnti);
return false;
}
cause_c cause;
cause.set_radio_network().value = cause_radio.value;
return u->send_uectxtreleaserequest(cause);
}
bool s1ap::user_exists(uint16_t rnti)
{
return users.find_ue_rnti(rnti) != nullptr;
}
void s1ap::ue_ctxt_setup_complete(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res)
{
ue* u = users.find_ue_rnti(rnti);
if (u == nullptr) {
return;
}
if (res.protocol_ies.erab_setup_list_ctxt_su_res.value.size() > 0) {
u->send_initial_ctxt_setup_response(res);
} else {
u->send_initial_ctxt_setup_failure();
}
}
void s1ap::ue_erab_setup_complete(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res)
{
ue* u = users.find_ue_rnti(rnti);
if (u == nullptr) {
s1ap_log->error("rnti 0x%x not found\n", rnti);
return;
}
u->send_erab_setup_response(res);
}
// void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
//{
//}
bool s1ap::is_mme_connected()
{
return mme_connected;
}
/*******************************************************************************
/* S1AP connection helpers
********************************************************************************/
bool s1ap::connect_mme()
{
s1ap_log->info("Connecting to MME %s:%d\n", args.mme_addr.c_str(), MME_PORT);
// Init SCTP socket and bind it
if (not srslte::net_utils::sctp_init_client(
&s1ap_socket, srslte::net_utils::socket_type::seqpacket, args.s1c_bind_addr.c_str())) {
return false;
}
// Connect to the MME address
if (not s1ap_socket.connect_to(args.mme_addr.c_str(), MME_PORT, &mme_addr)) {
return false;
}
// Assign a handler to rx MME packets (going to run in a different thread)
stack->add_mme_socket(s1ap_socket.fd());
s1ap_log->info("SCTP socket established with MME\n");
return true;
}
bool s1ap::setup_s1()
{
uint32_t tmp32;
uint16_t tmp16;
uint32_t plmn;
s1ap_mccmnc_to_plmn(args.mcc, args.mnc, &plmn);
plmn = htonl(plmn);
tmp32 = htonl(args.enb_id);
s1ap_pdu_c pdu;
pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_S1_SETUP);
s1_setup_request_ies_container& container = pdu.init_msg().value.s1_setup_request().protocol_ies;
container.global_enb_id.value.plm_nid[0] = ((uint8_t*)&plmn)[1];
container.global_enb_id.value.plm_nid[1] = ((uint8_t*)&plmn)[2];
container.global_enb_id.value.plm_nid[2] = ((uint8_t*)&plmn)[3];
container.global_enb_id.value.enb_id.set_macro_enb_id().from_number(args.enb_id);
container.enbname_present = true;
container.enbname.value.from_string(args.enb_name);
container.supported_tas.value.resize(1);
tmp16 = htons(args.tac);
memcpy(container.supported_tas.value[0].tac.data(), (uint8_t*)&tmp16, 2);
container.supported_tas.value[0].broadcast_plmns.resize(1);
container.supported_tas.value[0].broadcast_plmns[0][0] = ((uint8_t*)&plmn)[1];
container.supported_tas.value[0].broadcast_plmns[0][1] = ((uint8_t*)&plmn)[2];
container.supported_tas.value[0].broadcast_plmns[0][2] = ((uint8_t*)&plmn)[3];
container.default_paging_drx.value.value = asn1::s1ap::paging_drx_opts::v128; // Todo: add to args, config file
return sctp_send_s1ap_pdu(pdu, 0, "s1SetupRequest");
}
/*******************************************************************************
/* S1AP message handlers
********************************************************************************/
bool s1ap::handle_mme_rx_msg(srslte::unique_byte_buffer_t pdu,
const sockaddr_in& from,
const sctp_sndrcvinfo& sri,
int flags)
{
// Handle Notification Case
if (flags & MSG_NOTIFICATION) {
// Received notification
union sctp_notification* notification = (union sctp_notification*)pdu->msg;
s1ap_log->debug("SCTP Notification %d\n", notification->sn_header.sn_type);
if (notification->sn_header.sn_type == SCTP_SHUTDOWN_EVENT) {
s1ap_log->info("SCTP Association Shutdown. Association: %d\n", sri.sinfo_assoc_id);
s1ap_log->console("SCTP Association Shutdown. Association: %d\n", sri.sinfo_assoc_id);
s1ap_socket.reset();
}
} else if (pdu->N_bytes == 0) {
s1ap_log->error("SCTP return 0 bytes. Closing socket\n");
s1ap_socket.reset();
}
// Restart MME connection procedure if we lost connection
if (not s1ap_socket.is_init()) {
mme_connected = false;
if (not s1setup_proc.launch()) {
s1ap_log->error("Failed to initiate MME connection procedure.\n");
}
return false;
}
s1ap_log->info_hex(pdu->msg, pdu->N_bytes, "Received S1AP PDU");
handle_s1ap_rx_pdu(pdu.get());
return true;
}
bool s1ap::handle_s1ap_rx_pdu(srslte::byte_buffer_t* pdu)
{
// Save message to PCAP
if (pcap != nullptr) {
pcap->write_s1ap(pdu->msg, pdu->N_bytes);
}
s1ap_pdu_c rx_pdu;
asn1::cbit_ref bref(pdu->msg, pdu->N_bytes);
if (rx_pdu.unpack(bref) != asn1::SRSASN_SUCCESS) {
s1ap_log->error("Failed to unpack received PDU\n");
return false;
}
switch (rx_pdu.type().value) {
case s1ap_pdu_c::types_opts::init_msg:
return handle_initiatingmessage(rx_pdu.init_msg());
case s1ap_pdu_c::types_opts::successful_outcome:
return handle_successfuloutcome(rx_pdu.successful_outcome());
case s1ap_pdu_c::types_opts::unsuccessful_outcome:
return handle_unsuccessfuloutcome(rx_pdu.unsuccessful_outcome());
default:
s1ap_log->error("Unhandled PDU type %d\n", rx_pdu.type().value);
return false;
}
return true;
}
bool s1ap::handle_initiatingmessage(const init_msg_s& msg)
{
switch (msg.value.type().value) {
case s1ap_elem_procs_o::init_msg_c::types_opts::dl_nas_transport:
return handle_dlnastransport(msg.value.dl_nas_transport());
case s1ap_elem_procs_o::init_msg_c::types_opts::init_context_setup_request:
return handle_initialctxtsetuprequest(msg.value.init_context_setup_request());
case s1ap_elem_procs_o::init_msg_c::types_opts::ue_context_release_cmd:
return handle_uectxtreleasecommand(msg.value.ue_context_release_cmd());
case s1ap_elem_procs_o::init_msg_c::types_opts::paging:
return handle_paging(msg.value.paging());
case s1ap_elem_procs_o::init_msg_c::types_opts::erab_setup_request:
return handle_erabsetuprequest(msg.value.erab_setup_request());
case s1ap_elem_procs_o::init_msg_c::types_opts::ue_context_mod_request:
return handle_uecontextmodifyrequest(msg.value.ue_context_mod_request());
default:
s1ap_log->error("Unhandled intiating message: %s\n", msg.value.type().to_string().c_str());
}
return true;
}
bool s1ap::handle_successfuloutcome(const successful_outcome_s& msg)
{
switch (msg.value.type().value) {
case s1ap_elem_procs_o::successful_outcome_c::types_opts::s1_setup_resp:
return handle_s1setupresponse(msg.value.s1_setup_resp());
case s1ap_elem_procs_o::successful_outcome_c::types_opts::ho_cmd:
return handle_s1hocommand(msg.value.ho_cmd());
default:
s1ap_log->error("Unhandled successful outcome message: %s\n", msg.value.type().to_string().c_str());
}
return true;
}
bool s1ap::handle_unsuccessfuloutcome(const unsuccessful_outcome_s& msg)
{
switch (msg.value.type().value) {
case s1ap_elem_procs_o::unsuccessful_outcome_c::types_opts::s1_setup_fail:
return handle_s1setupfailure(msg.value.s1_setup_fail());
case s1ap_elem_procs_o::unsuccessful_outcome_c::types_opts::ho_prep_fail:
return handle_hopreparationfailure(msg.value.ho_prep_fail());
default:
s1ap_log->error("Unhandled unsuccessful outcome message: %s\n", msg.value.type().to_string().c_str());
}
return true;
}
bool s1ap::handle_s1setupresponse(const asn1::s1ap::s1_setup_resp_s& msg)
{
s1ap_log->info("Received S1SetupResponse\n");
s1setupresponse = msg;
mme_connected = true;
s1_setup_proc_t::s1setupresult res;
res.success = true;
s1setup_proc.trigger(res);
return true;
}
bool s1ap::handle_dlnastransport(const dl_nas_transport_s& msg)
{
s1ap_log->info("Received DownlinkNASTransport\n");
if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n");
}
ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
if (u == nullptr) {
return false;
}
if (msg.protocol_ies.ho_restrict_list_present) {
s1ap_log->warning("Not handling HandoverRestrictionList\n");
}
if (msg.protocol_ies.subscriber_profile_idfor_rfp_present) {
s1ap_log->warning("Not handling SubscriberProfileIDforRFP\n");
}
srslte::unique_byte_buffer_t pdu = srslte::allocate_unique_buffer(*pool);
if (pdu == nullptr) {
s1ap_log->error("Fatal Error: Couldn't allocate buffer in s1ap::run_thread().\n");
return false;
}
memcpy(pdu->msg, msg.protocol_ies.nas_pdu.value.data(), msg.protocol_ies.nas_pdu.value.size());
pdu->N_bytes = msg.protocol_ies.nas_pdu.value.size();
rrc->write_dl_info(u->ctxt.rnti, std::move(pdu));
return true;
}
bool s1ap::handle_initialctxtsetuprequest(const init_context_setup_request_s& msg)
{
s1ap_log->info("Received InitialContextSetupRequest\n");
if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n");
}
ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
if (u == nullptr) {
return false;
}
// Setup UE ctxt in RRC
if (not rrc->setup_ue_ctxt(u->ctxt.rnti, msg)) {
return false;
}
/* Ideally the check below would be "if (users[rnti].is_csfb)" */
if (msg.protocol_ies.cs_fallback_ind_present) {
if (msg.protocol_ies.cs_fallback_ind.value.value == cs_fallback_ind_opts::cs_fallback_required ||
msg.protocol_ies.cs_fallback_ind.value.value == cs_fallback_ind_opts::cs_fallback_high_prio) {
// Send RRC Release (cs-fallback-triggered) to MME
cause_c cause;
cause.set_radio_network().value = cause_radio_network_opts::cs_fallback_triggered;
/* TODO: This should normally probably only be sent after the SecurityMode procedure has completed! */
u->send_uectxtreleaserequest(cause);
}
}
return true;
}
bool s1ap::handle_paging(const asn1::s1ap::paging_s& msg)
{
if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n");
}
uint32_t ueid = msg.protocol_ies.ue_id_idx_value.value.to_number();
rrc->add_paging_id(ueid, msg.protocol_ies.ue_paging_id.value);
return true;
}
bool s1ap::handle_erabsetuprequest(const erab_setup_request_s& msg)
{
s1ap_log->info("Received ERABSetupRequest\n");
if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n");
}
ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
if (u == nullptr) {
return false;
}
// Setup UE ctxt in RRC
return rrc->setup_ue_erabs(u->ctxt.rnti, msg);
}
bool s1ap::handle_uecontextmodifyrequest(const ue_context_mod_request_s& msg)
{
s1ap_log->info("Received UeContextModificationRequest\n");
ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
if (u == nullptr) {
return false;
}
if (!rrc->modify_ue_ctxt(u->ctxt.rnti, msg)) {
cause_c cause;
cause.set_misc().value = cause_misc_opts::unspecified;
u->send_uectxtmodifyfailure(cause);
return true;
}
// Send UEContextModificationResponse
u->send_uectxtmodifyresp();
/* Ideally the check below would be "if (users[rnti].is_csfb)" */
if (msg.protocol_ies.cs_fallback_ind_present) {
if (msg.protocol_ies.cs_fallback_ind.value.value == cs_fallback_ind_opts::cs_fallback_required ||
msg.protocol_ies.cs_fallback_ind.value.value == cs_fallback_ind_opts::cs_fallback_high_prio) {
// Send RRC Release (cs-fallback-triggered) to MME
cause_c cause;
cause.set_radio_network().value = cause_radio_network_opts::cs_fallback_triggered;
u->send_uectxtreleaserequest(cause);
}
}
return true;
}
bool s1ap::handle_uectxtreleasecommand(const ue_context_release_cmd_s& msg)
{
s1ap_log->info("Received UEContextReleaseCommand\n");
if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n");
}
ue* u = nullptr;
if (msg.protocol_ies.ue_s1ap_ids.value.type().value == ue_s1ap_ids_c::types_opts::ue_s1ap_id_pair) {
auto& idpair = msg.protocol_ies.ue_s1ap_ids.value.ue_s1ap_id_pair();
if (idpair.ext) {
s1ap_log->warning("Not handling S1AP message extension\n");
}
if (idpair.ie_exts_present) {
s1ap_log->warning("Not handling S1AP message iE_Extensions\n");
}
u = find_s1apmsg_user(idpair.enb_ue_s1ap_id, idpair.mme_ue_s1ap_id);
if (u == nullptr) {
return false;
}
} else {
uint32_t mme_ue_id = msg.protocol_ies.ue_s1ap_ids.value.mme_ue_s1ap_id();
u = users.find_ue_mmeid(mme_ue_id);
if (u == nullptr) {
s1ap_log->warning("UE for mme_ue_s1ap_id:%d not found - discarding message\n", mme_ue_id);
return false;
}
}
uint16_t rnti = u->ctxt.rnti;
rrc->release_erabs(rnti);
u->send_uectxtreleasecomplete();
users.erase(u);
s1ap_log->info("UE context for RNTI:0x%x released\n", rnti);
rrc->release_complete(rnti);
return true;
}
bool s1ap::handle_s1setupfailure(const asn1::s1ap::s1_setup_fail_s& msg)
{
std::string cause = get_cause(msg.protocol_ies.cause.value);
s1ap_log->error("S1 Setup Failure. Cause: %s\n", cause.c_str());
s1ap_log->console("S1 Setup Failure. Cause: %s\n", cause.c_str());
return true;
}
bool s1ap::handle_hopreparationfailure(const ho_prep_fail_s& msg)
{
s1ap_log->info("Received HO Preparation Failure\n");
ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
if (u == nullptr) {
return false;
}
u->ho_prep_proc.trigger(msg);
return true;
}
bool s1ap::handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg)
{
s1ap_log->info("Received S1 HO Command\n");
ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
if (u == nullptr) {
return false;
}
u->ho_prep_proc.trigger(msg);
return true;
}
/*******************************************************************************
/* S1AP message senders
********************************************************************************/
bool s1ap::ue::send_initialuemessage(asn1::s1ap::rrc_establishment_cause_e cause,
srslte::unique_byte_buffer_t pdu,
bool has_tmsi,
uint32_t m_tmsi,
uint8_t mmec)
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_INIT_UE_MSG);
init_ue_msg_ies_container& container = tx_pdu.init_msg().value.init_ue_msg().protocol_ies;
// S_TMSI
if (has_tmsi) {
container.s_tmsi_present = true;
uint32_to_uint8(m_tmsi, container.s_tmsi.value.m_tmsi.data());
container.s_tmsi.value.mmec[0] = mmec;
}
// ENB_UE_S1AP_ID
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// NAS_PDU
container.nas_pdu.value.resize(pdu->N_bytes);
memcpy(container.nas_pdu.value.data(), pdu->msg, pdu->N_bytes);
// TAI
container.tai.value = s1ap_ptr->tai;
// EUTRAN_CGI
container.eutran_cgi.value = s1ap_ptr->eutran_cgi;
// RRC Establishment Cause
container.rrc_establishment_cause.value = cause;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "InitialUEMessage");
}
bool s1ap::ue::send_ulnastransport(srslte::unique_byte_buffer_t pdu)
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_UL_NAS_TRANSPORT);
asn1::s1ap::ul_nas_transport_ies_container& container = tx_pdu.init_msg().value.ul_nas_transport().protocol_ies;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// NAS PDU
container.nas_pdu.value.resize(pdu->N_bytes);
memcpy(container.nas_pdu.value.data(), pdu->msg, pdu->N_bytes);
// EUTRAN CGI
container.eutran_cgi.value = s1ap_ptr->eutran_cgi;
// TAI
container.tai.value = s1ap_ptr->tai;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UplinkNASTransport");
}
bool s1ap::ue::send_uectxtreleaserequest(const cause_c& cause)
{
if (!s1ap_ptr->mme_connected) {
return false;
}
release_requested = true;
s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_RELEASE_REQUEST);
ue_context_release_request_ies_container& container =
tx_pdu.init_msg().value.ue_context_release_request().protocol_ies;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// Cause
container.cause.value = cause;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextReleaseRequest");
}
bool s1ap::ue::send_uectxtreleasecomplete()
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_RELEASE);
auto& container = tx_pdu.successful_outcome().value.ue_context_release_complete().protocol_ies;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextReleaseComplete");
}
bool s1ap::ue::send_initial_ctxt_setup_response(const asn1::s1ap::init_context_setup_resp_s& res_)
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_INIT_CONTEXT_SETUP);
// Copy in the provided response message
tx_pdu.successful_outcome().value.init_context_setup_resp() = res_;
// Fill in the MME and eNB IDs
auto& container = tx_pdu.successful_outcome().value.init_context_setup_resp().protocol_ies;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// Fill in the GTP bind address for all bearers
for (uint32_t i = 0; i < container.erab_setup_list_ctxt_su_res.value.size(); ++i) {
auto& item = container.erab_setup_list_ctxt_su_res.value[i].value.erab_setup_item_ctxt_su_res();
item.transport_layer_address.resize(32);
uint8_t addr[4];
inet_pton(AF_INET, s1ap_ptr->args.gtp_bind_addr.c_str(), addr);
for (uint32_t j = 0; j < 4; ++j) {
item.transport_layer_address.data()[j] = addr[3 - j];
}
}
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "InitialContextSetupResponse");
}
bool s1ap::ue::send_erab_setup_response(const erab_setup_resp_s& res_)
{
if (not s1ap_ptr->mme_connected) {
return false;
}
asn1::s1ap::s1ap_pdu_c tx_pdu;
tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_ERAB_SETUP);
erab_setup_resp_s& res = tx_pdu.successful_outcome().value.erab_setup_resp();
res = res_;
// Fill in the GTP bind address for all bearers
if (res.protocol_ies.erab_setup_list_bearer_su_res_present) {
for (uint32_t i = 0; i < res.protocol_ies.erab_setup_list_bearer_su_res.value.size(); ++i) {
auto& item = res.protocol_ies.erab_setup_list_bearer_su_res.value[i].value.erab_setup_item_bearer_su_res();
item.transport_layer_address.resize(32);
uint8_t addr[4];
inet_pton(AF_INET, s1ap_ptr->args.gtp_bind_addr.c_str(), addr);
for (uint32_t j = 0; j < 4; ++j) {
item.transport_layer_address.data()[j] = addr[3 - j];
}
}
}
// Fill in the MME and eNB IDs
res.protocol_ies.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
res.protocol_ies.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "E_RABSetupResponse");
}
bool s1ap::ue::send_initial_ctxt_setup_failure()
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_unsuccessful_outcome().load_info_obj(ASN1_S1AP_ID_INIT_CONTEXT_SETUP);
auto& container = tx_pdu.unsuccessful_outcome().value.init_context_setup_fail().protocol_ies;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.cause.value.set_radio_network().value = cause_radio_network_opts::unspecified;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "InitialContextSetupFailure");
}
bool s1ap::ue::send_uectxtmodifyresp()
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_MOD);
auto& container = tx_pdu.successful_outcome().value.ue_context_mod_resp().protocol_ies;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextModificationResponse");
}
bool s1ap::ue::send_uectxtmodifyfailure(const cause_c& cause)
{
if (not s1ap_ptr->mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_unsuccessful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_MOD);
auto& container = tx_pdu.unsuccessful_outcome().value.ue_context_mod_fail().protocol_ies;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.cause.value = cause;
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextModificationFailure");
}
/*********************
* Handover Messages
********************/
bool s1ap::send_ho_required(uint16_t rnti,
uint32_t target_eci,
srslte::plmn_id_t target_plmn,
srslte::unique_byte_buffer_t rrc_container)
{
if (!mme_connected) {
return false;
}
ue* u = users.find_ue_rnti(rnti);
if (u == nullptr) {
return false;
}
// launch procedure
if (not u->ho_prep_proc.launch(target_eci, target_plmn, std::move(rrc_container))) {
s1ap_log->error("Failed to initiate an HandoverPreparation procedure for user rnti=0x%x\n", u->ctxt.rnti);
return false;
}
return true;
}
bool s1ap::send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_status_info>& bearer_status_list)
{
if (not mme_connected) {
return false;
}
ue* u = users.find_ue_rnti(rnti);
if (u == nullptr) {
return false;
}
return u->send_enb_status_transfer_proc(bearer_status_list);
}
// bool s1ap::send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
//{
// srslte::byte_buffer_t msg;
// LIBLTE_S1AP_S1AP_PDU_STRUCT tx_pdu;
// tx_pdu.ext = false;
// tx_pdu.choice_type = LIBLTE_S1AP_S1AP_PDU_CHOICE_INITIATINGMESSAGE;
// LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *init = &tx_pdu.choice.initiatingMessage;
// init->procedureCode = LIBLTE_S1AP_PROC_ID_UPLINKNASTRANSPORT;
// init->choice_type = LIBLTE_S1AP_INITIATINGMESSAGE_CHOICE_UECAPABILITYINFOINDICATION;
// LIBLTE_S1AP_MESSAGE_UECAPABILITYINFOINDICATION_STRUCT *caps = &init->choice.UECapabilityInfoIndication;
// caps->ext = false;
// caps->mme_ue_s1ap_id.mme_ue_s1ap_id = ue_ctxt_map[rnti]->mme_ue_s1ap_id;
// caps->enb_ue_s1ap_id.ENB_UE_S1AP_ID = ue_ctxt_map[rnti]->enb_ue_s1ap_id;
// // TODO: caps->UERadioCapability.
// liblte_s1ap_pack_s1ap_pdu(&tx_pdu, (LIBLTE_BYTE_MSG_STRUCT*)&msg);
// s1ap_log->info_hex(msg.msg, msg.N_bytes, "Sending UERadioCapabilityInfo for RNTI:0x%x", rnti);
// ssize_t n_sent = sctp_sendmsg(socket_fd, msg.msg, msg.N_bytes,
// (struct sockaddr*)&mme_addr, sizeof(struct sockaddr_in),
// htonl(PPID), 0, ue_ctxt_map[rnti]->stream_id, 0, 0);
// if(n_sent == -1) {
// s1ap_log->error("Failed to send UplinkNASTransport for RNTI:0x%x\n", rnti);
// return false;
// }
// return true;
//}
/*********************************************************
* s1ap::user_list class
*********************************************************/
s1ap::ue* s1ap::user_list::find_ue_rnti(uint16_t rnti)
{
if (rnti == SRSLTE_INVALID_RNTI) {
return nullptr;
}
auto it = std::find_if(
users.begin(), users.end(), [rnti](const user_list::pair_type& v) { return v.second->ctxt.rnti == rnti; });
return it != users.end() ? it->second.get() : nullptr;
}
s1ap::ue* s1ap::user_list::find_ue_enbid(uint32_t enbid)
{
auto it = users.find(enbid);
return (it != users.end()) ? it->second.get() : nullptr;
}
s1ap::ue* s1ap::user_list::find_ue_mmeid(uint32_t mmeid)
{
auto it = std::find_if(users.begin(), users.end(), [mmeid](const user_list::pair_type& v) {
return v.second->ctxt.mme_ue_s1ap_id_present and v.second->ctxt.mme_ue_s1ap_id == mmeid;
});
return it != users.end() ? it->second.get() : nullptr;
}
/**
* @brief Adds a user to the user list, avoiding any rnti, enb_s1ap_id, mme_s1ap_id duplication
* @param %user to be inserted
* @return ptr of inserted %user. If failure, returns nullptr
*/
s1ap::ue* s1ap::user_list::add_user(std::unique_ptr<s1ap::ue> user)
{
// Check for ID repetitions
if (find_ue_rnti(user->ctxt.rnti) != nullptr) {
srslte::logmap::get("S1AP")->error("The user to be added with rnti=0x%x already exists\n", user->ctxt.rnti);
return nullptr;
}
if (find_ue_enbid(user->ctxt.enb_ue_s1ap_id) != nullptr) {
srslte::logmap::get("S1AP")->error("The user to be added with enb id=%d already exists\n",
user->ctxt.enb_ue_s1ap_id);
return nullptr;
}
if (find_ue_mmeid(user->ctxt.mme_ue_s1ap_id) != nullptr) {
srslte::logmap::get("S1AP")->error("The user to be added with mme id=%d already exists\n",
user->ctxt.mme_ue_s1ap_id);
return nullptr;
}
auto p = users.insert(std::make_pair(user->ctxt.enb_ue_s1ap_id, std::move(user)));
return p.second ? p.first->second.get() : nullptr;
}
void s1ap::user_list::erase(ue* ue_ptr)
{
auto it = users.find(ue_ptr->ctxt.enb_ue_s1ap_id);
if (it == users.end()) {
srslte::logmap::get("S1AP")->error("User to be erased does not exist\n");
return;
}
users.erase(it);
}
/*******************************************************************************
/* General helpers
********************************************************************************/
bool s1ap::sctp_send_s1ap_pdu(const asn1::s1ap::s1ap_pdu_c& tx_pdu, uint32_t rnti, const char* procedure_name)
{
srslte::unique_byte_buffer_t buf = srslte::allocate_unique_buffer(*pool, false);
if (buf == nullptr) {
s1ap_log->error("Fatal Error: Couldn't allocate buffer for %s.\n", procedure_name);
return false;
}
asn1::bit_ref bref(buf->msg, buf->get_tailroom());
tx_pdu.pack(bref);
buf->N_bytes = bref.distance_bytes();
// Save message to PCAP
if (pcap != nullptr) {
pcap->write_s1ap(buf->msg, buf->N_bytes);
}
if (rnti > 0) {
s1ap_log->info_hex(buf->msg, buf->N_bytes, "Sending %s for rnti=0x%x", procedure_name, rnti);
} else {
s1ap_log->info_hex(buf->msg, buf->N_bytes, "Sending %s to MME", procedure_name);
}
uint16_t streamid = rnti == 0 ? NONUE_STREAM_ID : users.find_ue_rnti(rnti)->stream_id;
ssize_t n_sent = sctp_sendmsg(s1ap_socket.fd(),
buf->msg,
buf->N_bytes,
(struct sockaddr*)&mme_addr,
sizeof(struct sockaddr_in),
htonl(PPID),
0,
streamid,
0,
0);
if (n_sent == -1) {
if (rnti > 0) {
s1ap_log->error("Failed to send %s for rnti=0x%x\n", procedure_name, rnti);
} else {
s1ap_log->error("Failed to send %s\n", procedure_name);
}
return false;
}
return true;
}
/**
* Helper method to find user based on the enb_ue_s1ap_id stored in an S1AP Msg, and update mme_ue_s1ap_id
* @param enb_id enb_ue_s1ap_id value stored in S1AP message
* @param mme_id mme_ue_s1ap_id value stored in S1AP message
* @return pointer to user if it has been found
*/
s1ap::ue* s1ap::find_s1apmsg_user(uint32_t enb_id, uint32_t mme_id)
{
ue* user_ptr = users.find_ue_enbid(enb_id);
if (user_ptr == nullptr) {
s1ap_log->warning("enb_ue_s1ap_id=%d not found - discarding message\n", enb_id);
return nullptr;
}
if (user_ptr->ctxt.mme_ue_s1ap_id_present and user_ptr->ctxt.mme_ue_s1ap_id != mme_id) {
s1ap_log->warning("MME_UE_S1AP_ID has changed - old:%d, new:%d\n", user_ptr->ctxt.mme_ue_s1ap_id, mme_id);
}
user_ptr->ctxt.mme_ue_s1ap_id_present = true;
user_ptr->ctxt.mme_ue_s1ap_id = mme_id;
return user_ptr;
}
std::string s1ap::get_cause(const cause_c& c)
{
std::string cause = c.type().to_string();
cause += " - ";
switch (c.type().value) {
case cause_c::types_opts::radio_network:
cause += c.radio_network().to_string();
break;
case cause_c::types_opts::transport:
cause += c.transport().to_string();
break;
case cause_c::types_opts::nas:
cause += c.nas().to_string();
break;
case cause_c::types_opts::protocol:
cause += c.protocol().to_string();
break;
case cause_c::types_opts::misc:
cause += c.misc().to_string();
break;
default:
cause += "unknown";
break;
}
return cause;
}
void s1ap::start_pcap(srslte::s1ap_pcap* pcap_)
{
pcap = pcap_;
}
/*******************************************************************************
/* s1ap::ue Class
********************************************************************************/
s1ap::ue::ue(s1ap* s1ap_ptr_) : s1ap_ptr(s1ap_ptr_), s1ap_log(s1ap_ptr_->s1ap_log), ho_prep_proc(this)
{
ctxt.enb_ue_s1ap_id = s1ap_ptr->next_enb_ue_s1ap_id++;
gettimeofday(&ctxt.init_timestamp, nullptr);
stream_id = s1ap_ptr->next_ue_stream_id;
// initialize timers
ts1_reloc_prep = s1ap_ptr->timers->get_unique_timer();
ts1_reloc_prep.set(ts1_reloc_prep_timeout_ms,
[this](uint32_t tid) { ho_prep_proc.trigger(ho_prep_proc_t::ts1_reloc_prep_expired{}); });
ts1_reloc_overall = s1ap_ptr->timers->get_unique_timer();
ts1_reloc_overall.set(ts1_reloc_overall_timeout_ms, [](uint32_t tid) { /* TODO */ });
}
bool s1ap::ue::send_ho_required(uint32_t target_eci,
srslte::plmn_id_t target_plmn,
srslte::unique_byte_buffer_t rrc_container)
{
/*** Setup S1AP PDU as HandoverRequired ***/
s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_HO_PREP);
ho_required_ies_container& container = tx_pdu.init_msg().value.ho_required().protocol_ies;
/*** fill HO Required message ***/
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.direct_forwarding_path_availability_present = false; // NOTE: X2 for fwd path not supported
container.handov_type.value.value = handov_type_opts::intralte; // NOTE: only intra-LTE HO supported
container.cause.value.set_radio_network().value = cause_radio_network_opts::unspecified;
// LIBLTE_S1AP_CAUSERADIONETWORK_S1_INTRA_SYSTEM_HANDOVER_TRIGGERED;
/*** set the target eNB ***/
container.csg_id_present = false; // NOTE: CSG/hybrid target cell not supported
container.cell_access_mode_present = false; // only for hybrid cells
// no GERAN/UTRAN/PS
auto& targetenb = container.target_id.value.set_targetenb_id();
// set PLMN and TAI of target
// NOTE: Only HO without TAU supported.
uint16_t tmp16;
tmp16 = htons(s1ap_ptr->args.tac);
memcpy(targetenb.sel_tai.tac.data(), &tmp16, sizeof(uint16_t));
target_plmn.to_s1ap_plmn_bytes(targetenb.sel_tai.plm_nid.data());
// NOTE: Only HO to different Macro eNB is supported.
auto& macroenb = targetenb.global_enb_id.enb_id.set_macro_enb_id();
target_plmn.to_s1ap_plmn_bytes(targetenb.global_enb_id.plm_nid.data());
macroenb.from_number(target_eci >> 8u);
/*** fill the transparent container ***/
container.source_to_target_transparent_container_secondary_present = false;
sourceenb_to_targetenb_transparent_container_s transparent_cntr;
transparent_cntr.erab_info_list_present = false; // TODO: CHECK
transparent_cntr.subscriber_profile_idfor_rfp_present = false; // TODO: CHECK
// - set target cell ID
target_plmn.to_s1ap_plmn_bytes(transparent_cntr.target_cell_id.plm_nid.data());
transparent_cntr.target_cell_id.cell_id.from_number(target_eci); // [ENBID|CELLID|0]
// info specific to source cell and history of UE
// - set as last visited cell the source eNB PLMN & Cell ID
transparent_cntr.ue_history_info.resize(1);
auto& eutra = transparent_cntr.ue_history_info[0].set_e_utran_cell();
eutra.cell_type.cell_size.value = cell_size_opts::medium;
target_plmn.to_s1ap_plmn_bytes(eutra.global_cell_id.plm_nid.data());
eutra.global_cell_id.cell_id = s1ap_ptr->eutran_cgi.cell_id;
// - set time spent in current source cell
struct timeval ts[3];
memcpy(&ts[1], &ctxt.init_timestamp, sizeof(struct timeval));
gettimeofday(&ts[2], nullptr);
get_time_interval(ts);
eutra.time_ue_stayed_in_cell = (uint16_t)(ts[0].tv_usec / 1.0e6 + ts[0].tv_sec);
eutra.time_ue_stayed_in_cell = std::min(eutra.time_ue_stayed_in_cell, (uint16_t)4095);
// - fill RRC container
transparent_cntr.rrc_container.resize(rrc_container->N_bytes);
memcpy(transparent_cntr.rrc_container.data(), rrc_container->msg, rrc_container->N_bytes);
/*** pack Transparent Container into HORequired message ***/
uint8_t buffer[4096];
asn1::bit_ref bref(buffer, sizeof(buffer));
if (transparent_cntr.pack(bref) != asn1::SRSASN_SUCCESS) {
s1ap_log->error("Failed to pack transparent container of HO Required message\n");
return false;
}
container.source_to_target_transparent_container.value.resize(bref.distance_bytes());
memcpy(container.source_to_target_transparent_container.value.data(), buffer, bref.distance_bytes());
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "HORequired");
}
bool s1ap::ue::send_enb_status_transfer_proc(std::vector<bearer_status_info>& bearer_status_list)
{
if (bearer_status_list.empty()) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_ENB_STATUS_TRANSFER);
enb_status_transfer_ies_container& container = tx_pdu.init_msg().value.enb_status_transfer().protocol_ies;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
/* Create StatusTransfer transparent container with all the bearer ctxt to transfer */
auto& list = container.enb_status_transfer_transparent_container.value.bearers_subject_to_status_transfer_list;
list.resize(bearer_status_list.size());
for (uint32_t i = 0; i < list.size(); ++i) {
list[i].load_info_obj(ASN1_S1AP_ID_BEARERS_SUBJECT_TO_STATUS_TRANSFER_ITEM);
auto& asn1bearer = list[i].value.bearers_subject_to_status_transfer_item();
bearer_status_info& item = bearer_status_list[i];
asn1bearer.erab_id = item.erab_id;
asn1bearer.dl_coun_tvalue.pdcp_sn = item.pdcp_dl_sn;
asn1bearer.dl_coun_tvalue.hfn = item.dl_hfn;
asn1bearer.ul_coun_tvalue.pdcp_sn = item.pdcp_ul_sn;
asn1bearer.ul_coun_tvalue.hfn = item.ul_hfn;
// TODO: asn1bearer.receiveStatusofULPDCPSDUs_present
}
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "ENBStatusTransfer");
}
} // namespace srsenb
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