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changed the s1ap to allow the insertion of users without rnti

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master
Francisco Paisana 5 years ago committed by Francisco Paisana
parent 55a5947df7
commit 7557ef45c8
3 changed files with 312 additions and 248 deletions
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109
srsenb/hdr/stack/upper/s1ap.h
Unescape Escape View File

@ -34,17 +34,18 @@
#include "s1ap_metrics.h" #include "s1ap_metrics.h"
#include "srslte/common/network_utils.h" #include "srslte/common/network_utils.h"
#include "srslte/common/stack_procedure.h" #include "srslte/common/stack_procedure.h"
#include <unordered_map>
namespace srsenb { namespace srsenb {
typedef struct { struct ue_ctxt_t {
uint32_t rnti; static const uint16_t invalid_rnti = std::numeric_limits<uint16_t>::max();
uint32_t eNB_UE_S1AP_ID; static const uint32_t invalid_id = std::numeric_limits<uint32_t>::max();
uint32_t MME_UE_S1AP_ID; uint16_t rnti = invalid_rnti;
bool release_requested; uint32_t enb_ue_s1ap_id = invalid_id;
uint16_t stream_id; uint32_t mme_ue_s1ap_id = invalid_id;
struct timeval init_timestamp; struct timeval init_timestamp = {};
} ue_ctxt_t; };
class s1ap : public s1ap_interface_rrc class s1ap : public s1ap_interface_rrc
{ {
@ -55,7 +56,6 @@ public:
s1ap(); s1ap();
bool init(s1ap_args_t args_, bool init(s1ap_args_t args_,
rrc_interface_s1ap* rrc_, rrc_interface_s1ap* rrc_,
srslte::log* s1ap_log_,
srslte::timer_handler* timers_, srslte::timer_handler* timers_,
srsenb::stack_interface_s1ap_lte* stack_); srsenb::stack_interface_s1ap_lte* stack_);
void stop(); void stop();
@ -75,6 +75,11 @@ public:
void ue_ctxt_setup_complete(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res) 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; void ue_erab_setup_complete(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res) override;
bool is_mme_connected() 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); // void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps);
// Stack interface // Stack interface
@ -100,7 +105,7 @@ private:
struct sockaddr_in mme_addr = {}; // MME address struct sockaddr_in mme_addr = {}; // MME address
bool mme_connected = false; bool mme_connected = false;
bool running = false; bool running = false;
uint32_t next_eNB_UE_S1AP_ID = 1; // Next ENB-side UE identifier 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 uint16_t next_ue_stream_id = 1; // Next UE SCTP stream identifier
srslte::timer_handler::unique_timer mme_connect_timer, s1setup_timeout; srslte::timer_handler::unique_timer mme_connect_timer, s1setup_timeout;
@ -130,32 +135,10 @@ private:
bool handle_erabsetuprequest(const asn1::s1ap::erab_setup_request_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 handle_uecontextmodifyrequest(const asn1::s1ap::ue_context_mod_request_s& msg);
bool send_initialuemessage(uint16_t rnti,
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_ulnastransport(uint16_t rnti, srslte::unique_byte_buffer_t pdu);
bool send_uectxtreleaserequest(uint16_t rnti, const asn1::s1ap::cause_c& cause);
bool send_uectxtreleasecomplete(uint16_t rnti, uint32_t mme_ue_id, uint32_t enb_ue_id);
bool send_initial_ctxt_setup_response(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res_);
bool send_initial_ctxt_setup_failure(uint16_t rnti);
bool send_erab_setup_response(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res_);
// bool send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps) // bool send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
bool send_uectxmodifyresp(uint16_t rnti);
bool send_uectxmodifyfailure(uint16_t rnti, const asn1::s1ap::cause_c& cause);
// handover // handover
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 handle_hopreparationfailure(const asn1::s1ap::ho_prep_fail_s& msg); bool handle_hopreparationfailure(const asn1::s1ap::ho_prep_fail_s& msg);
bool handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg); bool handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg);
bool send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_status_info>& bearer_status_list) override;
bool find_mme_ue_id(uint32_t mme_ue_id, uint16_t* rnti, uint32_t* enb_ue_id);
std::string get_cause(const asn1::s1ap::cause_c& c);
// UE-specific data and procedures // UE-specific data and procedures
struct ue { struct ue {
@ -184,32 +167,68 @@ private:
srslte::unique_byte_buffer_t rrc_container; srslte::unique_byte_buffer_t rrc_container;
}; };
explicit ue(uint16_t rnti, s1ap* s1ap_ptr_); explicit ue(s1ap* s1ap_ptr_);
ue_ctxt_t& get_ctxt() { return ctxt; }
srslte::proc_t<ho_prep_proc_t>& get_ho_prep_proc() { return ho_prep_proc; }
bool send_enb_status_transfer_proc(std::vector<bearer_status_info>& bearer_status_list); 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: private:
bool bool
send_ho_required(uint32_t target_eci_, srslte::plmn_id_t target_plmn_, srslte::unique_byte_buffer_t rrc_container); 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 //! TS 36.413, Section 8.4.6 - eNB Status Transfer procedure
// args
s1ap* s1ap_ptr; s1ap* s1ap_ptr;
srslte::log* s1ap_log; srslte::log* s1ap_log;
ue_ctxt_t ctxt = {};
// 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_prep; ///< TS1_{RELOCprep} - max time for HO preparation
srslte::timer_handler::unique_timer ts1_reloc_overall; ///< TS1_{RELOCOverall} srslte::timer_handler::unique_timer ts1_reloc_overall; ///< TS1_{RELOCOverall}
// user procedures
srslte::proc_t<ho_prep_proc_t> ho_prep_proc;
}; };
std::map<uint16_t, std::unique_ptr<ue> > users;
std::map<uint32_t, uint16_t> enbid_to_rnti_map;
ue_ctxt_t* get_user_ctxt(uint16_t rnti); 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 // timers
srslte::timer_handler* timers = nullptr; srslte::timer_handler* timers = nullptr;
@ -235,6 +254,10 @@ private:
s1ap* s1ap_ptr = nullptr; 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; srslte::proc_t<s1_setup_proc_t> s1setup_proc;
}; };

2
srsenb/src/stack/enb_stack_lte.cc
Unescape Escape View File

@ -118,7 +118,7 @@ int enb_stack_lte::init(const stack_args_t& args_, const rrc_cfg_t& rrc_cfg_)
rlc.init(&pdcp, &rrc, &mac, &timers, &rlc_log); rlc.init(&pdcp, &rrc, &mac, &timers, &rlc_log);
pdcp.init(&rlc, &rrc, &gtpu); pdcp.init(&rlc, &rrc, &gtpu);
rrc.init(&rrc_cfg, phy, &mac, &rlc, &pdcp, &s1ap, &gtpu, &timers, &rrc_log); rrc.init(&rrc_cfg, phy, &mac, &rlc, &pdcp, &s1ap, &gtpu, &timers, &rrc_log);
s1ap.init(args.s1ap, &rrc, &s1ap_log, &timers, this); s1ap.init(args.s1ap, &rrc, &timers, this);
gtpu.init(args.s1ap.gtp_bind_addr, gtpu.init(args.s1ap.gtp_bind_addr,
args.s1ap.mme_addr, args.s1ap.mme_addr,
args.embms.m1u_multiaddr, args.embms.m1u_multiaddr,

449
srsenb/src/stack/upper/s1ap.cc
Unescape Escape View File

@ -23,6 +23,7 @@
#include "srsenb/hdr/stack/upper/common_enb.h" #include "srsenb/hdr/stack/upper/common_enb.h"
#include "srslte/common/bcd_helpers.h" #include "srslte/common/bcd_helpers.h"
#include "srslte/common/int_helpers.h" #include "srslte/common/int_helpers.h"
#include "srslte/common/logmap.h"
#include <arpa/inet.h> //for inet_ntop() #include <arpa/inet.h> //for inet_ntop()
#include <inttypes.h> #include <inttypes.h>
@ -57,7 +58,7 @@ srslte::proc_outcome_t s1ap::ue::ho_prep_proc_t::init(uint32_t
target_eci = target_eci_; target_eci = target_eci_;
target_plmn = target_plmn_; target_plmn = target_plmn_;
procInfo("Sending HandoverRequired to MME id=%d\n", ue_ptr->ctxt.MME_UE_S1AP_ID); 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_))) { 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); procError("Failed to send HORequired to cell 0x%x\n", target_eci);
return srslte::proc_outcome_t::error; return srslte::proc_outcome_t::error;
@ -222,13 +223,12 @@ s1ap::s1ap() : s1setup_proc(this) {}
bool s1ap::init(s1ap_args_t args_, bool s1ap::init(s1ap_args_t args_,
rrc_interface_s1ap* rrc_, rrc_interface_s1ap* rrc_,
srslte::log* s1ap_log_,
srslte::timer_handler* timers_, srslte::timer_handler* timers_,
srsenb::stack_interface_s1ap_lte* stack_) srsenb::stack_interface_s1ap_lte* stack_)
{ {
rrc = rrc_; rrc = rrc_;
args = args_; args = args_;
s1ap_log = s1ap_log_; s1ap_log = srslte::logmap::get("S1AP");
timers = timers_; timers = timers_;
stack = stack_; stack = stack_;
pool = srslte::byte_buffer_pool::get_instance(); pool = srslte::byte_buffer_pool::get_instance();
@ -324,8 +324,14 @@ void s1ap::build_tai_cgi()
********************************************************************************/ ********************************************************************************/
void s1ap::initial_ue(uint16_t rnti, asn1::s1ap::rrc_establishment_cause_e cause, srslte::unique_byte_buffer_t pdu) void s1ap::initial_ue(uint16_t rnti, asn1::s1ap::rrc_establishment_cause_e cause, srslte::unique_byte_buffer_t pdu)
{ {
users.insert(std::make_pair(rnti, std::unique_ptr<ue>(new ue{rnti, this}))); std::unique_ptr<ue> ue_ptr{new ue{this}};
send_initialuemessage(rnti, cause, std::move(pdu), false); 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, void s1ap::initial_ue(uint16_t rnti,
@ -334,31 +340,40 @@ void s1ap::initial_ue(uint16_t rnti,
uint32_t m_tmsi, uint32_t m_tmsi,
uint8_t mmec) uint8_t mmec)
{ {
users.insert(std::make_pair(rnti, std::unique_ptr<ue>(new ue{rnti, this}))); std::unique_ptr<ue> ue_ptr{new ue{this}};
send_initialuemessage(rnti, cause, std::move(pdu), true, m_tmsi, mmec); 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) 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"); s1ap_log->info_hex(pdu->msg, pdu->N_bytes, "Received RRC SDU");
if (get_user_ctxt(rnti) != nullptr) { ue* u = users.find_ue_rnti(rnti);
send_ulnastransport(rnti, std::move(pdu)); 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) 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); s1ap_log->info("User inactivity - RNTI:0x%x\n", rnti);
ue_ctxt_t* ctxt = get_user_ctxt(rnti); ue* u = users.find_ue_rnti(rnti);
if (ctxt == nullptr) { if (u == nullptr) {
return false; return false;
} }
if (ctxt->release_requested) { if (u->was_uectxtrelease_requested()) {
s1ap_log->warning("UE context for RNTI:0x%x is in zombie state. Releasing...\n", rnti); s1ap_log->warning("UE context for RNTI:0x%x is in zombie state. Releasing...\n", rnti);
users.erase(rnti); users.erase(u);
rrc->release_complete(rnti); rrc->release_complete(rnti);
return false; return false;
} }
@ -366,27 +381,35 @@ bool s1ap::user_release(uint16_t rnti, asn1::s1ap::cause_radio_network_e cause_r
cause_c cause; cause_c cause;
cause.set_radio_network().value = cause_radio.value; cause.set_radio_network().value = cause_radio.value;
ctxt->release_requested = true; return u->send_uectxtreleaserequest(cause);
return send_uectxtreleaserequest(rnti, cause);
} }
bool s1ap::user_exists(uint16_t rnti) bool s1ap::user_exists(uint16_t rnti)
{ {
return users.end() != users.find(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) 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) { if (res.protocol_ies.erab_setup_list_ctxt_su_res.value.size() > 0) {
send_initial_ctxt_setup_response(rnti, res); u->send_initial_ctxt_setup_response(res);
} else { } else {
send_initial_ctxt_setup_failure(rnti); u->send_initial_ctxt_setup_failure();
} }
} }
void s1ap::ue_erab_setup_complete(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res) void s1ap::ue_erab_setup_complete(uint16_t rnti, const asn1::s1ap::erab_setup_resp_s& res)
{ {
send_erab_setup_response(rnti, 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) // void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
@ -588,13 +611,10 @@ bool s1ap::handle_dlnastransport(const dl_nas_transport_s& msg)
if (msg.ext) { if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n"); s1ap_log->warning("Not handling S1AP message extension\n");
} }
if (enbid_to_rnti_map.end() == enbid_to_rnti_map.find(msg.protocol_ies.enb_ue_s1ap_id.value.value)) { ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
s1ap_log->warning("eNB_UE_S1AP_ID not found - discarding message\n"); if (u == nullptr) {
return false; return false;
} }
uint16_t rnti = enbid_to_rnti_map[msg.protocol_ies.enb_ue_s1ap_id.value.value];
ue_ctxt_t* ctxt = get_user_ctxt(rnti);
ctxt->MME_UE_S1AP_ID = msg.protocol_ies.mme_ue_s1ap_id.value.value;
if (msg.protocol_ies.ho_restrict_list_present) { if (msg.protocol_ies.ho_restrict_list_present) {
s1ap_log->warning("Not handling HandoverRestrictionList\n"); s1ap_log->warning("Not handling HandoverRestrictionList\n");
@ -610,7 +630,7 @@ bool s1ap::handle_dlnastransport(const dl_nas_transport_s& msg)
} }
memcpy(pdu->msg, msg.protocol_ies.nas_pdu.value.data(), msg.protocol_ies.nas_pdu.value.size()); 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(); pdu->N_bytes = msg.protocol_ies.nas_pdu.value.size();
rrc->write_dl_info(rnti, std::move(pdu)); rrc->write_dl_info(u->ctxt.rnti, std::move(pdu));
return true; return true;
} }
@ -620,21 +640,13 @@ bool s1ap::handle_initialctxtsetuprequest(const init_context_setup_request_s& ms
if (msg.ext) { if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n"); s1ap_log->warning("Not handling S1AP message extension\n");
} }
if (enbid_to_rnti_map.end() == enbid_to_rnti_map.find(msg.protocol_ies.enb_ue_s1ap_id.value.value)) { ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
s1ap_log->warning("eNB_UE_S1AP_ID not found - discarding message\n"); if (u == nullptr) {
return false; return false;
} }
uint16_t rnti = enbid_to_rnti_map[msg.protocol_ies.enb_ue_s1ap_id.value.value];
ue_ctxt_t* ctxt = get_user_ctxt(rnti);
if (msg.protocol_ies.mme_ue_s1ap_id.value.value != ctxt->MME_UE_S1AP_ID) {
s1ap_log->warning("MME_UE_S1AP_ID has changed - old:%d, new: %" PRIu64 "\n",
ctxt->MME_UE_S1AP_ID,
msg.protocol_ies.mme_ue_s1ap_id.value.value);
ctxt->MME_UE_S1AP_ID = msg.protocol_ies.mme_ue_s1ap_id.value.value;
}
// Setup UE ctxt in RRC // Setup UE ctxt in RRC
if (!rrc->setup_ue_ctxt(rnti, msg)) { if (not rrc->setup_ue_ctxt(u->ctxt.rnti, msg)) {
return false; return false;
} }
@ -647,8 +659,7 @@ bool s1ap::handle_initialctxtsetuprequest(const init_context_setup_request_s& ms
cause.set_radio_network().value = cause_radio_network_opts::cs_fallback_triggered; 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! */ /* TODO: This should normally probably only be sent after the SecurityMode procedure has completed! */
ctxt->release_requested = true; u->send_uectxtreleaserequest(cause);
send_uectxtreleaserequest(rnti, cause);
} }
} }
@ -671,49 +682,32 @@ bool s1ap::handle_erabsetuprequest(const erab_setup_request_s& msg)
if (msg.ext) { if (msg.ext) {
s1ap_log->warning("Not handling S1AP message extension\n"); 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 (enbid_to_rnti_map.end() == enbid_to_rnti_map.find(msg.protocol_ies.enb_ue_s1ap_id.value.value)) { if (u == nullptr) {
s1ap_log->warning("eNB_UE_S1AP_ID not found - discarding message\n");
return false; return false;
} }
uint16_t rnti = enbid_to_rnti_map[msg.protocol_ies.enb_ue_s1ap_id.value.value];
ue_ctxt_t* ctxt = get_user_ctxt(rnti);
if (msg.protocol_ies.mme_ue_s1ap_id.value.value != ctxt->MME_UE_S1AP_ID) {
s1ap_log->warning("MME_UE_S1AP_ID has changed - old:%d, new:%" PRIu64 "\n",
ctxt->MME_UE_S1AP_ID,
msg.protocol_ies.mme_ue_s1ap_id.value.value);
ctxt->MME_UE_S1AP_ID = msg.protocol_ies.mme_ue_s1ap_id.value.value;
}
// Setup UE ctxt in RRC // Setup UE ctxt in RRC
return rrc->setup_ue_erabs(rnti, msg); return rrc->setup_ue_erabs(u->ctxt.rnti, msg);
} }
bool s1ap::handle_uecontextmodifyrequest(const ue_context_mod_request_s& msg) bool s1ap::handle_uecontextmodifyrequest(const ue_context_mod_request_s& msg)
{ {
s1ap_log->info("Received UeContextModificationRequest\n"); s1ap_log->info("Received UeContextModificationRequest\n");
if (enbid_to_rnti_map.end() == enbid_to_rnti_map.find(msg.protocol_ies.enb_ue_s1ap_id.value.value)) { ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
s1ap_log->warning("eNB_UE_S1AP_ID not found - discarding message\n"); if (u == nullptr) {
return false; return false;
} }
uint16_t rnti = enbid_to_rnti_map[msg.protocol_ies.enb_ue_s1ap_id.value.value];
ue_ctxt_t* ctxt = get_user_ctxt(rnti);
if (msg.protocol_ies.mme_ue_s1ap_id.value.value != ctxt->MME_UE_S1AP_ID) {
s1ap_log->warning("MME_UE_S1AP_ID has changed - old:%d, new:%" PRIu64 "\n",
ctxt->MME_UE_S1AP_ID,
msg.protocol_ies.mme_ue_s1ap_id.value.value);
ctxt->MME_UE_S1AP_ID = msg.protocol_ies.mme_ue_s1ap_id.value.value;
}
if (!rrc->modify_ue_ctxt(rnti, msg)) { if (!rrc->modify_ue_ctxt(u->ctxt.rnti, msg)) {
cause_c cause; cause_c cause;
cause.set_misc().value = cause_misc_opts::unspecified; cause.set_misc().value = cause_misc_opts::unspecified;
send_uectxmodifyfailure(rnti, cause); u->send_uectxtmodifyfailure(cause);
return true; return true;
} }
// Send UEContextModificationResponse // Send UEContextModificationResponse
send_uectxmodifyresp(rnti); u->send_uectxtmodifyresp();
/* Ideally the check below would be "if (users[rnti].is_csfb)" */ /* 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_present) {
@ -723,8 +717,7 @@ bool s1ap::handle_uecontextmodifyrequest(const ue_context_mod_request_s& msg)
cause_c cause; cause_c cause;
cause.set_radio_network().value = cause_radio_network_opts::cs_fallback_triggered; cause.set_radio_network().value = cause_radio_network_opts::cs_fallback_triggered;
ctxt->release_requested = true; u->send_uectxtreleaserequest(cause);
send_uectxtreleaserequest(rnti, cause);
} }
} }
@ -738,7 +731,7 @@ bool s1ap::handle_uectxtreleasecommand(const ue_context_release_cmd_s& msg)
s1ap_log->warning("Not handling S1AP message extension\n"); s1ap_log->warning("Not handling S1AP message extension\n");
} }
uint16_t rnti = 0; ue* u = nullptr;
if (msg.protocol_ies.ue_s1ap_ids.value.type().value == ue_s1ap_ids_c::types_opts::ue_s1ap_id_pair) { 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(); auto& idpair = msg.protocol_ies.ue_s1ap_ids.value.ue_s1ap_id_pair();
@ -748,33 +741,23 @@ bool s1ap::handle_uectxtreleasecommand(const ue_context_release_cmd_s& msg)
if (idpair.ie_exts_present) { if (idpair.ie_exts_present) {
s1ap_log->warning("Not handling S1AP message iE_Extensions\n"); s1ap_log->warning("Not handling S1AP message iE_Extensions\n");
} }
uint32_t enb_ue_id = idpair.enb_ue_s1ap_id; u = find_s1apmsg_user(idpair.enb_ue_s1ap_id, idpair.mme_ue_s1ap_id);
if (enbid_to_rnti_map.end() == enbid_to_rnti_map.find(enb_ue_id)) { if (u == nullptr) {
s1ap_log->warning("eNB_UE_S1AP_ID:%d not found - discarding message\n", enb_ue_id);
return false; return false;
} }
rnti = enbid_to_rnti_map[enb_ue_id]; } else {
enbid_to_rnti_map.erase(enb_ue_id);
} else { // LIBLTE_S1AP_UE_S1AP_IDS_CHOICE_MME_UE_S1AP_ID
uint32_t mme_ue_id = msg.protocol_ies.ue_s1ap_ids.value.mme_ue_s1ap_id(); uint32_t mme_ue_id = msg.protocol_ies.ue_s1ap_ids.value.mme_ue_s1ap_id();
uint32_t enb_ue_id; u = users.find_ue_mmeid(mme_ue_id);
if (!find_mme_ue_id(mme_ue_id, &rnti, &enb_ue_id)) { if (u == nullptr) {
s1ap_log->warning("UE for MME_UE_S1AP_ID:%d not found - discarding message\n", mme_ue_id); s1ap_log->warning("UE for mme_ue_s1ap_id:%d not found - discarding message\n", mme_ue_id);
return false; return false;
} }
enbid_to_rnti_map.erase(enb_ue_id);
}
ue_ctxt_t* ctxt = get_user_ctxt(rnti);
if (ctxt == nullptr) {
return false;
} }
uint16_t rnti = u->ctxt.rnti;
rrc->release_erabs(rnti); rrc->release_erabs(rnti);
send_uectxtreleasecomplete(rnti, ctxt->MME_UE_S1AP_ID, ctxt->eNB_UE_S1AP_ID); u->send_uectxtreleasecomplete();
users.erase(rnti); users.erase(u);
s1ap_log->info("UE context for RNTI:0x%x released\n", rnti); s1ap_log->info("UE context for RNTI:0x%x released\n", rnti);
rrc->release_complete(rnti); rrc->release_complete(rnti);
return true; return true;
@ -790,22 +773,23 @@ bool s1ap::handle_s1setupfailure(const asn1::s1ap::s1_setup_fail_s& msg)
bool s1ap::handle_hopreparationfailure(const ho_prep_fail_s& msg) bool s1ap::handle_hopreparationfailure(const ho_prep_fail_s& msg)
{ {
auto user_it = users.find(enbid_to_rnti_map[msg.protocol_ies.enb_ue_s1ap_id.value.value]); s1ap_log->info("Received HO Preparation Failure\n");
if (user_it == users.end()) { ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
s1ap_log->error("user rnti=0x%x no longer exists\n", user_it->first); if (u == nullptr) {
return false;
} }
user_it->second->get_ho_prep_proc().trigger(msg); u->ho_prep_proc.trigger(msg);
return true; return true;
} }
bool s1ap::handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg) bool s1ap::handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg)
{ {
auto user_it = users.find(enbid_to_rnti_map[msg.protocol_ies.enb_ue_s1ap_id.value.value]); s1ap_log->info("Received S1 HO Command\n");
if (user_it == users.end()) { ue* u = find_s1apmsg_user(msg.protocol_ies.enb_ue_s1ap_id.value.value, msg.protocol_ies.mme_ue_s1ap_id.value.value);
s1ap_log->error("user rnti=0x%x no longer exists\n", user_it->first); if (u == nullptr) {
return false; return false;
} }
user_it->second->get_ho_prep_proc().trigger(msg); u->ho_prep_proc.trigger(msg);
return true; return true;
} }
@ -813,14 +797,13 @@ bool s1ap::handle_s1hocommand(const asn1::s1ap::ho_cmd_s& msg)
/* S1AP message senders /* S1AP message senders
********************************************************************************/ ********************************************************************************/
bool s1ap::send_initialuemessage(uint16_t rnti, bool s1ap::ue::send_initialuemessage(asn1::s1ap::rrc_establishment_cause_e cause,
asn1::s1ap::rrc_establishment_cause_e cause, srslte::unique_byte_buffer_t pdu,
srslte::unique_byte_buffer_t pdu, bool has_tmsi,
bool has_tmsi, uint32_t m_tmsi,
uint32_t m_tmsi, uint8_t mmec)
uint8_t mmec)
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
@ -836,107 +819,103 @@ bool s1ap::send_initialuemessage(uint16_t rnti,
} }
// ENB_UE_S1AP_ID // ENB_UE_S1AP_ID
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// NAS_PDU // NAS_PDU
container.nas_pdu.value.resize(pdu->N_bytes); container.nas_pdu.value.resize(pdu->N_bytes);
memcpy(container.nas_pdu.value.data(), pdu->msg, pdu->N_bytes); memcpy(container.nas_pdu.value.data(), pdu->msg, pdu->N_bytes);
// TAI // TAI
container.tai.value.ie_exts_present = tai.iE_Extensions_present; container.tai.value.ie_exts_present = s1ap_ptr->tai.iE_Extensions_present;
container.tai.value.ext = tai.ext; container.tai.value.ext = s1ap_ptr->tai.ext;
memcpy(container.tai.value.tac.data(), tai.tAC.buffer, 2); memcpy(container.tai.value.tac.data(), s1ap_ptr->tai.tAC.buffer, 2);
memcpy(container.tai.value.plm_nid.data(), tai.pLMNidentity.buffer, 3); memcpy(container.tai.value.plm_nid.data(), s1ap_ptr->tai.pLMNidentity.buffer, 3);
// EUTRAN_CGI // EUTRAN_CGI
container.eutran_cgi.value.ext = eutran_cgi.ext; container.eutran_cgi.value.ext = s1ap_ptr->eutran_cgi.ext;
container.eutran_cgi.value.ie_exts_present = eutran_cgi.iE_Extensions_present; container.eutran_cgi.value.ie_exts_present = s1ap_ptr->eutran_cgi.iE_Extensions_present;
memcpy(container.eutran_cgi.value.plm_nid.data(), eutran_cgi.pLMNidentity.buffer, 3); memcpy(container.eutran_cgi.value.plm_nid.data(), s1ap_ptr->eutran_cgi.pLMNidentity.buffer, 3);
for (uint32_t i = 0; i < 28; ++i) { for (uint32_t i = 0; i < 28; ++i) {
container.eutran_cgi.value.cell_id.set(i, (bool)eutran_cgi.cell_ID.buffer[i]); container.eutran_cgi.value.cell_id.set(i, (bool)s1ap_ptr->eutran_cgi.cell_ID.buffer[i]);
} }
// RRC Establishment Cause // RRC Establishment Cause
container.rrc_establishment_cause.value = cause; container.rrc_establishment_cause.value = cause;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "InitialUEMessage"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "InitialUEMessage");
} }
bool s1ap::send_ulnastransport(uint16_t rnti, srslte::unique_byte_buffer_t pdu) bool s1ap::ue::send_ulnastransport(srslte::unique_byte_buffer_t pdu)
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
s1ap_pdu_c tx_pdu; s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_UL_NAS_TRANSPORT); 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; asn1::s1ap::ul_nas_transport_ies_container& container = tx_pdu.init_msg().value.ul_nas_transport().protocol_ies;
// MME_UE_S1AP_ID container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// ENB_UE_S1AP_ID
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID;
// NAS PDU // NAS PDU
container.nas_pdu.value.resize(pdu->N_bytes); container.nas_pdu.value.resize(pdu->N_bytes);
memcpy(container.nas_pdu.value.data(), pdu->msg, pdu->N_bytes); memcpy(container.nas_pdu.value.data(), pdu->msg, pdu->N_bytes);
// EUTRAN CGI // EUTRAN CGI
container.eutran_cgi.value.ext = eutran_cgi.ext; container.eutran_cgi.value.ext = s1ap_ptr->eutran_cgi.ext;
container.eutran_cgi.value.ie_exts_present = eutran_cgi.iE_Extensions_present; container.eutran_cgi.value.ie_exts_present = s1ap_ptr->eutran_cgi.iE_Extensions_present;
memcpy(container.eutran_cgi.value.plm_nid.data(), eutran_cgi.pLMNidentity.buffer, 3); memcpy(container.eutran_cgi.value.plm_nid.data(), s1ap_ptr->eutran_cgi.pLMNidentity.buffer, 3);
for (uint32_t i = 0; i < 28; ++i) { for (uint32_t i = 0; i < 28; ++i) {
container.eutran_cgi.value.cell_id.set(i, (bool)eutran_cgi.cell_ID.buffer[i]); container.eutran_cgi.value.cell_id.set(i, (bool)s1ap_ptr->eutran_cgi.cell_ID.buffer[i]);
} }
// TAI // TAI
container.tai.value.ie_exts_present = tai.iE_Extensions_present; container.tai.value.ie_exts_present = s1ap_ptr->tai.iE_Extensions_present;
container.tai.value.ext = tai.ext; container.tai.value.ext = s1ap_ptr->tai.ext;
memcpy(container.tai.value.tac.data(), tai.tAC.buffer, 2); memcpy(container.tai.value.tac.data(), s1ap_ptr->tai.tAC.buffer, 2);
memcpy(container.tai.value.plm_nid.data(), tai.pLMNidentity.buffer, 3); memcpy(container.tai.value.plm_nid.data(), s1ap_ptr->tai.pLMNidentity.buffer, 3);
return sctp_send_s1ap_pdu(tx_pdu, rnti, "UplinkNASTransport"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UplinkNASTransport");
} }
bool s1ap::send_uectxtreleaserequest(uint16_t rnti, const cause_c& cause) bool s1ap::ue::send_uectxtreleaserequest(const cause_c& cause)
{ {
if (!mme_connected) { if (!s1ap_ptr->mme_connected) {
return false; return false;
} }
release_requested = true;
s1ap_pdu_c tx_pdu; s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_RELEASE_REQUEST); tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_RELEASE_REQUEST);
ue_context_release_request_ies_container& container = ue_context_release_request_ies_container& container =
tx_pdu.init_msg().value.ue_context_release_request().protocol_ies; tx_pdu.init_msg().value.ue_context_release_request().protocol_ies;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
// MME_UE_S1AP_ID container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID;
// ENB_UE_S1AP_ID
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID;
// Cause // Cause
container.cause.value = cause; container.cause.value = cause;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "UEContextReleaseRequest"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextReleaseRequest");
} }
bool s1ap::send_uectxtreleasecomplete(uint16_t rnti, uint32_t mme_ue_id, uint32_t enb_ue_id) bool s1ap::ue::send_uectxtreleasecomplete()
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
s1ap_pdu_c tx_pdu; s1ap_pdu_c tx_pdu;
tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_RELEASE); tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_RELEASE);
auto& container = tx_pdu.successful_outcome().value.ue_context_release_cmd().protocol_ies; auto& container = tx_pdu.successful_outcome().value.ue_context_release_cmd().protocol_ies;
container.enb_ue_s1ap_id.value = enb_ue_id; container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = mme_ue_id; container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "UEContextReleaseComplete"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextReleaseComplete");
} }
bool s1ap::send_initial_ctxt_setup_response(uint16_t rnti, const asn1::s1ap::init_context_setup_resp_s& res_) bool s1ap::ue::send_initial_ctxt_setup_response(const asn1::s1ap::init_context_setup_resp_s& res_)
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
@ -948,26 +927,26 @@ bool s1ap::send_initial_ctxt_setup_response(uint16_t rnti, const asn1::s1ap::ini
// Fill in the MME and eNB IDs // Fill in the MME and eNB IDs
auto& container = tx_pdu.successful_outcome().value.init_context_setup_request().protocol_ies; auto& container = tx_pdu.successful_outcome().value.init_context_setup_request().protocol_ies;
container.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID; container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
// Fill in the GTP bind address for all bearers // 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) { 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(); auto& item = container.erab_setup_list_ctxt_su_res.value[i].value.erab_setup_item_ctxt_su_res();
item.transport_layer_address.resize(32); item.transport_layer_address.resize(32);
uint8_t addr[4]; uint8_t addr[4];
inet_pton(AF_INET, args.gtp_bind_addr.c_str(), addr); inet_pton(AF_INET, s1ap_ptr->args.gtp_bind_addr.c_str(), addr);
for (uint32_t j = 0; j < 4; ++j) { for (uint32_t j = 0; j < 4; ++j) {
item.transport_layer_address.data()[j] = addr[3 - j]; item.transport_layer_address.data()[j] = addr[3 - j];
} }
} }
return sctp_send_s1ap_pdu(tx_pdu, rnti, "InitialContextSetupResponse"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "InitialContextSetupResponse");
} }
bool s1ap::send_erab_setup_response(uint16_t rnti, const erab_setup_resp_s& res_) bool s1ap::ue::send_erab_setup_response(const erab_setup_resp_s& res_)
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
@ -983,7 +962,7 @@ bool s1ap::send_erab_setup_response(uint16_t rnti, const erab_setup_resp_s& res_
auto& item = res.protocol_ies.erab_setup_list_bearer_su_res.value[i].value.erab_setup_item_bearer_su_res(); 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); item.transport_layer_address.resize(32);
uint8_t addr[4]; uint8_t addr[4];
inet_pton(AF_INET, args.gtp_bind_addr.c_str(), addr); inet_pton(AF_INET, s1ap_ptr->args.gtp_bind_addr.c_str(), addr);
for (uint32_t j = 0; j < 4; ++j) { for (uint32_t j = 0; j < 4; ++j) {
item.transport_layer_address.data()[j] = addr[3 - j]; item.transport_layer_address.data()[j] = addr[3 - j];
} }
@ -991,15 +970,15 @@ bool s1ap::send_erab_setup_response(uint16_t rnti, const erab_setup_resp_s& res_
} }
// Fill in the MME and eNB IDs // Fill in the MME and eNB IDs
res.protocol_ies.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID; res.protocol_ies.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
res.protocol_ies.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID; res.protocol_ies.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "E_RABSetupResponse"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "E_RABSetupResponse");
} }
bool s1ap::send_initial_ctxt_setup_failure(uint16_t rnti) bool s1ap::ue::send_initial_ctxt_setup_failure()
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
@ -1007,16 +986,16 @@ bool s1ap::send_initial_ctxt_setup_failure(uint16_t rnti)
tx_pdu.set_unsuccessful_outcome().load_info_obj(ASN1_S1AP_ID_INIT_CONTEXT_SETUP); tx_pdu.set_unsuccessful_outcome().load_info_obj(ASN1_S1AP_ID_INIT_CONTEXT_SETUP);
auto& container = tx_pdu.unsuccessful_outcome().value.init_context_setup_request().protocol_ies; auto& container = tx_pdu.unsuccessful_outcome().value.init_context_setup_request().protocol_ies;
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID; container.mme_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.cause.value.set_radio_network().value = cause_radio_network_opts::unspecified; container.cause.value.set_radio_network().value = cause_radio_network_opts::unspecified;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "InitialContextSetupFailure"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "InitialContextSetupFailure");
} }
bool s1ap::send_uectxmodifyresp(uint16_t rnti) bool s1ap::ue::send_uectxtmodifyresp()
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
@ -1024,15 +1003,15 @@ bool s1ap::send_uectxmodifyresp(uint16_t rnti)
tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_MOD); tx_pdu.set_successful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_MOD);
auto& container = tx_pdu.successful_outcome().value.ue_context_mod_request().protocol_ies; auto& container = tx_pdu.successful_outcome().value.ue_context_mod_request().protocol_ies;
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID; container.mme_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "UEContextModificationResponse"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextModificationResponse");
} }
bool s1ap::send_uectxmodifyfailure(uint16_t rnti, const cause_c& cause) bool s1ap::ue::send_uectxtmodifyfailure(const cause_c& cause)
{ {
if (!mme_connected) { if (not s1ap_ptr->mme_connected) {
return false; return false;
} }
@ -1040,11 +1019,11 @@ bool s1ap::send_uectxmodifyfailure(uint16_t rnti, const cause_c& cause)
tx_pdu.set_unsuccessful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_MOD); tx_pdu.set_unsuccessful_outcome().load_info_obj(ASN1_S1AP_ID_UE_CONTEXT_MOD);
auto& container = tx_pdu.unsuccessful_outcome().value.ue_context_mod_request().protocol_ies; auto& container = tx_pdu.unsuccessful_outcome().value.ue_context_mod_request().protocol_ies;
container.enb_ue_s1ap_id.value = get_user_ctxt(rnti)->MME_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
container.mme_ue_s1ap_id.value = get_user_ctxt(rnti)->eNB_UE_S1AP_ID; container.mme_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.cause.value = cause; container.cause.value = cause;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "UEContextModificationFailure"); return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextModificationFailure");
} }
/********************* /*********************
@ -1059,15 +1038,14 @@ bool s1ap::send_ho_required(uint16_t rnti,
if (!mme_connected) { if (!mme_connected) {
return false; return false;
} }
auto it = users.find(rnti); ue* u = users.find_ue_rnti(rnti);
if (it == users.end()) { if (u == nullptr) {
return false; return false;
} }
// launch procedure // launch procedure
if (not it->second->get_ho_prep_proc().launch(target_eci, target_plmn, std::move(rrc_container))) { 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", s1ap_log->error("Failed to initiate an HandoverPreparation procedure for user rnti=0x%x\n", u->ctxt.rnti);
it->second->get_ctxt().rnti);
return false; return false;
} }
return true; return true;
@ -1078,12 +1056,12 @@ bool s1ap::send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_statu
if (not mme_connected) { if (not mme_connected) {
return false; return false;
} }
auto it = users.find(rnti); ue* u = users.find_ue_rnti(rnti);
if (it == users.end()) { if (u == nullptr) {
return false; return false;
} }
return it->second->send_enb_status_transfer_proc(bearer_status_list); 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) // bool s1ap::send_ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps)
@ -1100,8 +1078,8 @@ bool s1ap::send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_statu
// LIBLTE_S1AP_MESSAGE_UECAPABILITYINFOINDICATION_STRUCT *caps = &init->choice.UECapabilityInfoIndication; // LIBLTE_S1AP_MESSAGE_UECAPABILITYINFOINDICATION_STRUCT *caps = &init->choice.UECapabilityInfoIndication;
// caps->ext = false; // caps->ext = false;
// caps->MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ctxt_map[rnti]->MME_UE_S1AP_ID; // 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; // caps->enb_ue_s1ap_id.ENB_UE_S1AP_ID = ue_ctxt_map[rnti]->enb_ue_s1ap_id;
// // TODO: caps->UERadioCapability. // // TODO: caps->UERadioCapability.
// liblte_s1ap_pack_s1ap_pdu(&tx_pdu, (LIBLTE_BYTE_MSG_STRUCT*)&msg); // liblte_s1ap_pack_s1ap_pdu(&tx_pdu, (LIBLTE_BYTE_MSG_STRUCT*)&msg);
@ -1118,6 +1096,73 @@ bool s1ap::send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_statu
// return true; // return true;
//} //}
/*********************************************************
* s1ap::user_list class
*********************************************************/
s1ap::ue* s1ap::user_list::find_ue_rnti(uint16_t rnti)
{
if (rnti == ue_ctxt_t::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)
{
if (mmeid == ue_ctxt_t::invalid_id) {
return nullptr;
}
auto it = std::find_if(users.begin(), users.end(), [mmeid](const user_list::pair_type& v) {
return 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 /* General helpers
********************************************************************************/ ********************************************************************************/
@ -1138,7 +1183,7 @@ bool s1ap::sctp_send_s1ap_pdu(const asn1::s1ap::s1ap_pdu_c& tx_pdu, uint32_t rnt
} else { } else {
s1ap_log->info_hex(buf->msg, buf->N_bytes, "Sending %s to MME", procedure_name); s1ap_log->info_hex(buf->msg, buf->N_bytes, "Sending %s to MME", procedure_name);
} }
uint16_t streamid = rnti == 0 ? NONUE_STREAM_ID : get_user_ctxt(rnti)->stream_id; uint16_t streamid = rnti == 0 ? NONUE_STREAM_ID : users.find_ue_rnti(rnti)->stream_id;
ssize_t n_sent = sctp_sendmsg(s1ap_socket.fd(), ssize_t n_sent = sctp_sendmsg(s1ap_socket.fd(),
buf->msg, buf->msg,
@ -1161,16 +1206,24 @@ bool s1ap::sctp_send_s1ap_pdu(const asn1::s1ap::s1ap_pdu_c& tx_pdu, uint32_t rnt
return true; return true;
} }
bool s1ap::find_mme_ue_id(uint32_t mme_ue_id, uint16_t* rnti, uint32_t* enb_ue_id) /**
* 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)
{ {
for (auto& it : users) { ue* user_ptr = users.find_ue_enbid(enb_id);
if (it.second->get_ctxt().MME_UE_S1AP_ID == mme_ue_id) { if (user_ptr == nullptr) {
*rnti = it.second->get_ctxt().rnti; s1ap_log->warning("enb_ue_s1ap_id=%d not found - discarding message\n", enb_id);
*enb_ue_id = it.second->get_ctxt().eNB_UE_S1AP_ID; return nullptr;
return true; }
} if (user_ptr->ctxt.mme_ue_s1ap_id != ue_ctxt_t::invalid_id 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);
} }
return false; user_ptr->ctxt.mme_ue_s1ap_id = mme_id;
return user_ptr;
} }
std::string s1ap::get_cause(const cause_c& c) std::string s1ap::get_cause(const cause_c& c)
@ -1200,28 +1253,16 @@ std::string s1ap::get_cause(const cause_c& c)
return cause; return cause;
} }
ue_ctxt_t* s1ap::get_user_ctxt(uint16_t rnti)
{
auto it = users.find(rnti);
if (it == users.end()) {
s1ap_log->warning("User rnti=0x%x context not found\n", rnti);
return nullptr;
}
return &it->second->get_ctxt();
}
/******************************************************************************* /*******************************************************************************
/* s1ap::ue Class /* s1ap::ue Class
********************************************************************************/ ********************************************************************************/
s1ap::ue::ue(uint16_t rnti_, s1ap* s1ap_ptr_) : s1ap_ptr(s1ap_ptr_), s1ap_log(s1ap_ptr_->s1ap_log), ho_prep_proc(this) s1ap::ue::ue(s1ap* s1ap_ptr_) : s1ap_ptr(s1ap_ptr_), s1ap_log(s1ap_ptr_->s1ap_log), ho_prep_proc(this)
{ {
ctxt.rnti = rnti_; ctxt.enb_ue_s1ap_id = s1ap_ptr->next_enb_ue_s1ap_id++;
ctxt.eNB_UE_S1AP_ID = s1ap_ptr->next_eNB_UE_S1AP_ID++;
ctxt.stream_id = 1;
ctxt.release_requested = false;
gettimeofday(&ctxt.init_timestamp, nullptr); gettimeofday(&ctxt.init_timestamp, nullptr);
s1ap_ptr->enbid_to_rnti_map[ctxt.eNB_UE_S1AP_ID] = ctxt.rnti;
stream_id = s1ap_ptr->next_ue_stream_id++;
// initialize timers // initialize timers
ts1_reloc_prep = s1ap_ptr->timers->get_unique_timer(); ts1_reloc_prep = s1ap_ptr->timers->get_unique_timer();
@ -1241,8 +1282,8 @@ bool s1ap::ue::send_ho_required(uint32_t target_eci,
ho_required_ies_container& container = tx_pdu.init_msg().value.ho_required().protocol_ies; ho_required_ies_container& container = tx_pdu.init_msg().value.ho_required().protocol_ies;
/*** fill HO Required message ***/ /*** fill HO Required message ***/
container.enb_ue_s1ap_id.value = ctxt.eNB_UE_S1AP_ID; container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.MME_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.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.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; container.cause.value.set_radio_network().value = cause_radio_network_opts::unspecified;
@ -1315,8 +1356,8 @@ bool s1ap::ue::send_enb_status_transfer_proc(std::vector<bearer_status_info>& be
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_ENB_STATUS_TRANSFER); 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; 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.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.MME_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 */ /* 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; auto& list = container.enb_status_transfer_transparent_container.value.bearers_subject_to_status_transfer_list;

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