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srsRAN_4G
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Merging handling of initial UE messages as static methods into nas cleanup.

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master
Pedro Alvarez 6 years ago
parent c011df5612 9350e03810
commit 7bad5a52a0
9 changed files with 593 additions and 847 deletions
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3
lib/include/srslte/interfaces/epc_interfaces.h
Unescape Escape View File

@ -53,6 +53,9 @@ public:
virtual bool add_nas_ctx_to_mme_ue_s1ap_id_map(nas *nas_ctx) = 0;
virtual bool add_ue_to_enb_set(int32_t enb_assoc, uint32_t mme_ue_s1ap_id) = 0;
virtual bool release_ue_ecm_ctx(uint32_t mme_ue_s1ap_id) = 0;
virtual bool delete_ue_ctx(uint64_t imsi) = 0;
virtual uint64_t find_imsi_from_m_tmsi(uint32_t m_tmsi) = 0;
virtual nas* find_nas_ctx_from_imsi(uint64_t imsi) = 0;
virtual bool send_initial_context_setup_request(uint64_t imsi, uint16_t erab_to_setup) = 0;
virtual bool send_ue_context_release_command(uint32_t mme_ue_s1ap_id) = 0;
virtual bool send_downlink_nas_transport(uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id, srslte::byte_buffer_t *nas_msg, struct sctp_sndrcvinfo enb_sri) = 0;

167
srsepc/hdr/mme/nas.h
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@ -131,71 +131,128 @@ typedef struct{
LIBLTE_MME_EPS_MOBILE_ID_GUTI_STRUCT guti;
} sec_ctx_t;
/*
* NAS Initialization Arguments
*/
typedef struct {
uint16_t mcc;
uint16_t mnc;
uint8_t mme_code;
uint16_t mme_group;
uint16_t tac;
std::string apn;
std::string dns;
} nas_init_t;
class nas
{
public:
nas();
void init(uint16_t mcc,
uint16_t mnc,
uint8_t mme_code,
uint16_t mme_group,
uint16_t tac,
std::string apn,
std::string dns,
void init(nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
/*Initial UE messages*/
bool handle_attach_request( uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_imsi_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
struct sctp_sndrcvinfo *enb_sri);
bool handle_guti_attach_request( uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_guti_attach_request_known_ue( uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_rx,
struct sctp_sndrcvinfo *enb_sri);
bool handle_guti_attach_request_unknown_ue( uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_service_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
struct sctp_sndrcvinfo *enb_sri);
/***********************
* Initial UE messages *
***********************/
//Attach request messages
static bool handle_attach_request( uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
srslte::byte_buffer_t *nas_rx,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
static bool handle_imsi_attach_request_unknown_ue( uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
static bool handle_imsi_attach_request_known_ue( nas *nas_ctx,
uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_rx,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
static bool handle_guti_attach_request_unknown_ue( uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
static bool handle_guti_attach_request_known_ue( nas *nas_ctx,
uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_rx,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
//Service request messages
static bool handle_service_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
srslte::byte_buffer_t *nas_rx,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
//Dettach request messages
static bool handle_detach_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
srslte::byte_buffer_t *nas_rx,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
//Tracking area update request messages
static bool handle_tracking_area_update_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
struct sctp_sndrcvinfo *enb_sri,
srslte::byte_buffer_t *nas_rx,
nas_init_t args,
s1ap_interface_nas *s1ap,
gtpc_interface_nas *gtpc,
hss_interface_nas *hss,
srslte::log *nas_log);
/* Uplink NAS messages handling */
bool handle_authentication_response( srslte::byte_buffer_t *nas_rx);
bool handle_security_mode_complete( srslte::byte_buffer_t *nas_rx);
bool handle_attach_complete( srslte::byte_buffer_t *nas_rx);
bool handle_esm_information_response( srslte::byte_buffer_t *nas_rx);
bool handle_identity_response( srslte::byte_buffer_t *nas_rx);
bool handle_tracking_area_update_request( srslte::byte_buffer_t *nas_rx);
bool handle_authentication_failure( srslte::byte_buffer_t *nas_rx);
bool handle_nas_detach_request( srslte::byte_buffer_t *nas_rx);
bool handle_authentication_response (srslte::byte_buffer_t *nas_rx);
bool handle_security_mode_complete (srslte::byte_buffer_t *nas_rx);
bool handle_attach_complete (srslte::byte_buffer_t *nas_rx);
bool handle_esm_information_response (srslte::byte_buffer_t *nas_rx);
bool handle_identity_response (srslte::byte_buffer_t *nas_rx);
bool handle_tracking_area_update_request (srslte::byte_buffer_t *nas_rx);
bool handle_authentication_failure (srslte::byte_buffer_t *nas_rx);
bool handle_detach_request (srslte::byte_buffer_t *nas_rx);
/* Downlink NAS messages packing */
bool pack_authentication_request (srslte::byte_buffer_t *nas_buffer);
@ -211,7 +268,7 @@ public:
bool integrity_check (srslte::byte_buffer_t *pdu);
bool short_integrity_check (srslte::byte_buffer_t *pdu);
/* UE Context*/
/* UE Context */
emm_ctx_t m_emm_ctx;
ecm_ctx_t m_ecm_ctx;
esm_ctx_t m_esm_ctx[MAX_ERABS_PER_UE];

6
srsepc/hdr/mme/s1ap.h
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@ -89,15 +89,15 @@ public:
bool add_nas_ctx_to_mme_ue_s1ap_id_map(nas *nas_ctx);
bool add_ue_to_enb_set(int32_t enb_assoc, uint32_t mme_ue_s1ap_id);
nas* find_nas_ctx_from_imsi(uint64_t imsi);
virtual nas* find_nas_ctx_from_imsi(uint64_t imsi);
nas* find_nas_ctx_from_mme_ue_s1ap_id(uint32_t mme_ue_s1ap_id);
bool release_ue_ecm_ctx(uint32_t mme_ue_s1ap_id);
void release_ues_ecm_ctx_in_enb(int32_t enb_assoc);
bool delete_ue_ctx(uint64_t imsi);
virtual bool delete_ue_ctx(uint64_t imsi);
uint32_t allocate_m_tmsi(uint64_t imsi);
uint64_t find_imsi_from_m_tmsi(uint32_t m_tmsi);
virtual uint64_t find_imsi_from_m_tmsi(uint32_t m_tmsi);
s1ap_args_t m_s1ap_args;
srslte::log_filter *m_s1ap_log;

21
srsepc/hdr/mme/s1ap_nas_transport.h
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@ -48,27 +48,6 @@ public:
bool handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT *ul_xport, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
bool send_downlink_nas_transport(uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id, srslte::byte_buffer_t *nas_msg, struct sctp_sndrcvinfo enb_sri);
bool handle_nas_attach_request(uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_imsi_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool handle_nas_detach_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,

2
srsepc/src/hss/hss.cc
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@ -614,7 +614,7 @@ hss::increment_ue_sqn(uint64_t imsi)
}
increment_sqn(ue_ctx->sqn,ue_ctx->sqn);
m_hss_log->debug("Incremented SQN (IMSI: %" PRIu64 ")" PRIu64 "\n", imsi);
m_hss_log->debug("Incremented SQN -- IMSI: %" PRIu64 "\n", imsi);
m_hss_log->debug_hex(ue_ctx->sqn, 6, "SQN: ");
}

3
srsepc/src/main.cc
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@ -257,6 +257,9 @@ parse_args(all_args_t *args, int argc, char* argv[]) {
if(!vm.count("log.hss_hex_limit")) {
args->log_args.hss_hex_limit = args->log_args.all_hex_limit;
}
if(!vm.count("log.nas_hex_limit")) {
args->log_args.nas_hex_limit = args->log_args.all_hex_limit;
}
}
// Check user database

824
srsepc/src/mme/nas.cc
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File diff suppressed because it is too large Load Diff

4
srsepc/src/mme/s1ap.cc
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@ -587,10 +587,10 @@ s1ap::find_imsi_from_m_tmsi(uint32_t m_tmsi)
{
std::map<uint32_t,uint64_t>::iterator it = m_tmsi_to_imsi.find(m_tmsi);
if (it != m_tmsi_to_imsi.end()) {
m_s1ap_log->debug("Found IMSI %015lu from M-TMSI 0x%x", it->second, m_tmsi);
m_s1ap_log->debug("Found IMSI %015lu from M-TMSI 0x%x\n", it->second, m_tmsi);
return it->second;
} else {
m_s1ap_log->debug("Could not find IMSI from M-TMSI 0x%x", m_tmsi);
m_s1ap_log->debug("Could not find IMSI from M-TMSI 0x%x\n", m_tmsi);
return 0;
}
}

410
srsepc/src/mme/s1ap_nas_transport.cc
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@ -88,44 +88,25 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
memcpy(nas_msg->msg, &init_ue->NAS_PDU.buffer, init_ue->NAS_PDU.n_octets);
nas_msg->N_bytes = init_ue->NAS_PDU.n_octets;
uint64_t imsi;
uint32_t m_tmsi;
uint64_t imsi = 0;
uint32_t m_tmsi = 0;
uint32_t enb_ue_s1ap_id = init_ue->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID;
liblte_mme_parse_msg_header((LIBLTE_BYTE_MSG_STRUCT *) nas_msg, &pd, &msg_type);
m_s1ap_log->console("Initial UE message: %s\n", liblte_nas_msg_type_to_string(msg_type));
m_s1ap_log->info ("Initial UE message: %s\n", liblte_nas_msg_type_to_string(msg_type));
//Make sure M-TMSI is present, if mandatory
if (msg_type != LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST && !init_ue->S_TMSI_present){
m_s1ap_log->error("Initial UE Message 0x%x -- S-TMSI not present\n", msg_type);
m_s1ap_log->console("Initial UE message 0x%x -- S-TMSI not present\n", msg_type);
m_pool->deallocate(nas_msg);
return false;
}
//Get NAS context if TMSI is present
nas *nas_ctx = NULL;
if (init_ue->S_TMSI_present) {
m_tmsi = ntohl(*((uint32_t*)&init_ue->S_TMSI.m_TMSI.buffer));
imsi = m_s1ap->find_imsi_from_m_tmsi(m_tmsi);
if(imsi !=0){
nas_ctx = m_s1ap->find_nas_ctx_from_imsi(imsi);
}
}
//Create new NAS context if Attach request without known NAS context
//This will be release if the attach request returns an error
if (msg_type == LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST && nas_ctx == NULL) {
nas_ctx = new nas;
nas_ctx->init(m_s1ap->m_s1ap_args.mcc,
m_s1ap->m_s1ap_args.mnc,
m_s1ap->m_s1ap_args.mme_code,
m_s1ap->m_s1ap_args.mme_group,
m_s1ap->m_s1ap_args.tac,
m_s1ap->m_s1ap_args.mme_apn,
m_s1ap->m_s1ap_args.dns_addr,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
nas_init_t nas_init;
nas_init.mcc = m_s1ap->m_s1ap_args.mcc;
nas_init.mnc = m_s1ap->m_s1ap_args.mnc;
nas_init.mme_code = m_s1ap->m_s1ap_args.mme_code;
nas_init.mme_group = m_s1ap->m_s1ap_args.mme_group;
nas_init.tac = m_s1ap->m_s1ap_args.tac;
nas_init.apn = m_s1ap->m_s1ap_args.mme_apn;
nas_init.dns = m_s1ap->m_s1ap_args.dns_addr;
if(init_ue->S_TMSI_present){
m_tmsi = ntohl(*((uint32_t*) &init_ue->S_TMSI.m_TMSI.buffer));
}
switch (msg_type)
@ -133,25 +114,26 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA
case LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST:
m_s1ap_log->console("Received Initial UE message -- Attach Request\n");
m_s1ap_log->info("Received Initial UE message -- Attach Request\n");
err = handle_nas_attach_request(enb_ue_s1ap_id, nas_msg, reply_buffer,reply_flag, enb_sri);
if (err == false) {
delete nas_ctx;
}
err = nas::handle_attach_request(enb_ue_s1ap_id, enb_sri, nas_msg, nas_init,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
break;
case LIBLTE_MME_SECURITY_HDR_TYPE_SERVICE_REQUEST:
m_s1ap_log->console("Received Initial UE message -- Service Request\n");
m_s1ap_log->info("Received Initial UE message -- Service Request\n");
err = handle_nas_service_request(m_tmsi, enb_ue_s1ap_id, nas_msg, reply_buffer,reply_flag, enb_sri);
err = nas::handle_service_request(m_tmsi, enb_ue_s1ap_id, enb_sri, nas_msg, nas_init,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
break;
case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST:
m_s1ap_log->console("Received Initial UE message -- Detach Request\n");
m_s1ap_log->info("Received Initial UE message -- Detach Request\n");
err = handle_nas_detach_request(m_tmsi, enb_ue_s1ap_id, nas_msg, reply_buffer,reply_flag, enb_sri);
err = nas::handle_detach_request(m_tmsi, enb_ue_s1ap_id, enb_sri, nas_msg, nas_init,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
break;
case LIBLTE_MME_MSG_TYPE_TRACKING_AREA_UPDATE_REQUEST:
m_s1ap_log->console("Received Initial UE message -- Tracking Area Update Request\n");
m_s1ap_log->info("Received Initial UE message -- Tracking Area Update Request\n");
err = handle_nas_tracking_area_update_request(m_tmsi, enb_ue_s1ap_id, nas_msg, reply_buffer,reply_flag, enb_sri);
err = nas::handle_tracking_area_update_request(m_tmsi, enb_ue_s1ap_id, enb_sri, nas_msg, nas_init,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
break;
default:
m_s1ap_log->info("Unhandled Initial UE Message 0x%x \n", msg_type);
@ -235,11 +217,11 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST:
m_s1ap_log->info("Plain Protected UL NAS: Detach Request\n");
m_s1ap_log->console("Plain Protected UL NAS: Detach Request\n");
nas_ctx->handle_nas_detach_request(nas_msg);
nas_ctx->handle_detach_request(nas_msg);
break;
default:
m_s1ap_log->warning("Unhandled Plain NAS message 0x%x\n", msg_type );
m_s1ap_log->console("Unhandled Plain NAS message 0x%x\n", msg_type );
m_s1ap_log->warning("Unhandled Plain NAS message 0x%x\n", msg_type);
m_s1ap_log->console("Unhandled Plain NAS message 0x%x\n", msg_type);
m_pool->deallocate(nas_msg);
return false;
}
@ -302,7 +284,7 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST:
m_s1ap_log->info("Integrity Protected UL NAS: Detach Request\n");
m_s1ap_log->console("Integrity Protected UL NAS: Detach Request\n");
nas_ctx->handle_nas_detach_request(nas_msg);
nas_ctx->handle_detach_request(nas_msg);
break;
default:
m_s1ap_log->warning("Unhandled NAS integrity protected message %s\n", liblte_nas_msg_type_to_string(msg_type));
@ -319,348 +301,6 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
return true;
}
bool
s1ap_nas_transport::handle_nas_attach_request(uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT attach_req;
LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT pdn_con_req;
//Get NAS Attach Request and PDN connectivity request messages
LIBLTE_ERROR_ENUM err = liblte_mme_unpack_attach_request_msg((LIBLTE_BYTE_MSG_STRUCT *) nas_msg, &attach_req);
if(err != LIBLTE_SUCCESS){
m_s1ap_log->error("Error unpacking NAS attach request. Error: %s\n", liblte_error_text[err]);
m_pool->deallocate(nas_msg);
return false;
}
/*Get PDN Connectivity Request*/
err = liblte_mme_unpack_pdn_connectivity_request_msg(&attach_req.esm_msg, &pdn_con_req);
if(err != LIBLTE_SUCCESS){
m_s1ap_log->error("Error unpacking NAS PDN Connectivity Request. Error: %s\n", liblte_error_text[err]);
m_pool->deallocate(nas_msg);
return false;
}
//Get attach type from attach request
if (attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_IMSI) {
m_s1ap_log->console("Attach Request -- IMSI-style attach request\n");
m_s1ap_log->info("Attach Request -- IMSI-style attach request\n");
handle_nas_imsi_attach_request(enb_ue_s1ap_id, attach_req, pdn_con_req, reply_buffer, reply_flag, enb_sri);
} else if (attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_GUTI) {
m_s1ap_log->console("Attach Request -- GUTI-style attach request\n");
m_s1ap_log->info("Attach Request -- GUTI-style attach request\n");
handle_nas_guti_attach_request(enb_ue_s1ap_id, attach_req, pdn_con_req, nas_msg, reply_buffer, reply_flag, enb_sri);
} else {
m_s1ap_log->error("Unhandled Mobile Id type in attach request\n");
return false;
}
return true;
}
bool
s1ap_nas_transport::handle_nas_imsi_attach_request(uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
//Get UE's IMSI
uint64_t imsi = 0;
for(int i=0;i<=14;i++){
imsi += attach_req.eps_mobile_id.imsi[i]*std::pow(10,14-i);
}
//Check if UE is already attached
nas *old_ctx = m_s1ap->find_nas_ctx_from_imsi(imsi);
if (old_ctx!=NULL) {
m_s1ap_log->console("Attach Request -- UE is already attached.");
m_s1ap_log->info("Attach Request -- UE is already attached.");
//Detaching previoulsy attached UE.
m_mme_gtpc->send_delete_session_request(imsi);
if (old_ctx->m_ecm_ctx.mme_ue_s1ap_id!=0) {
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(old_ctx);
}
m_s1ap->delete_ue_ctx(imsi);
}
//Set UE's EMM context
nas *nas_ctx = new nas;
nas_ctx->init(m_s1ap->m_s1ap_args.mcc,
m_s1ap->m_s1ap_args.mnc,
m_s1ap->m_s1ap_args.mme_code,
m_s1ap->m_s1ap_args.mme_group,
m_s1ap->m_s1ap_args.tac,
m_s1ap->m_s1ap_args.mme_apn,
m_s1ap->m_s1ap_args.dns_addr,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
bool err = nas_ctx->handle_imsi_attach_request( enb_ue_s1ap_id,
attach_req,
pdn_con_req,
enb_sri);
if (err == false){
delete nas_ctx;
}
return err;
}
bool
s1ap_nas_transport::handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT &attach_req,
const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT &pdn_con_req,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
//Parse the message security header
uint8 pd = 0;
uint8 sec_hdr_type = 0;
liblte_mme_parse_msg_sec_header((LIBLTE_BYTE_MSG_STRUCT*)nas_msg, &pd, &sec_hdr_type);
bool integrity_valid = false;
if(sec_hdr_type != LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY) {
m_s1ap_log->info("Attach request -- GUTI-stlye attach request is not integrity protected\n");
m_s1ap_log->console("Attach request -- GUTI-stlye attach request is not integrity protected\n");
} else {
m_s1ap_log->info("Attach request -- GUTI-stlye attach request is integrity protected\n");
m_s1ap_log->console("Attach request -- GUTI-stlye attach request is integrity protected\n");
}
//GUTI style attach
uint32_t m_tmsi = attach_req.eps_mobile_id.guti.m_tmsi;
std::map<uint32_t,uint64_t>::iterator it = m_s1ap->m_tmsi_to_imsi.find(m_tmsi);
if (it == m_s1ap->m_tmsi_to_imsi.end()) {
//Could not find IMSI from M-TMSI, send Id request
m_s1ap_log->console("Attach Request -- Could not find M-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->info("Attach Request -- Could not find M-TMSI 0x%x\n", m_tmsi);
nas *nas_ctx = new nas;
nas_ctx->init(m_s1ap->m_s1ap_args.mcc,
m_s1ap->m_s1ap_args.mnc,
m_s1ap->m_s1ap_args.mme_code,
m_s1ap->m_s1ap_args.mme_group,
m_s1ap->m_s1ap_args.tac,
m_s1ap->m_s1ap_args.mme_apn,
m_s1ap->m_s1ap_args.dns_addr,
m_s1ap, m_mme_gtpc, m_hss, m_s1ap->m_nas_log);
bool err = nas_ctx->handle_guti_attach_request_unknown_ue( enb_ue_s1ap_id,
attach_req,
pdn_con_req,
nas_msg,
reply_buffer,
reply_flag,
enb_sri);
if (err == false) {
delete nas_ctx;
}
return err;
} else {
//Found UE context from M-TMSI
m_s1ap_log->console("Attach Request -- Found M-TMSI: %d\n",m_tmsi);
m_s1ap_log->console("Attach Request -- IMSI: %015lu\n",it->second);
//Get UE EMM context
nas *nas_ctx = m_s1ap->find_nas_ctx_from_imsi(it->second);
if (nas_ctx!=NULL) {
nas_ctx->handle_guti_attach_request_known_ue( enb_ue_s1ap_id,
attach_req,
pdn_con_req,
nas_msg,
enb_sri);
} else {
m_s1ap_log->error("Found M-TMSI but could not find UE context\n");
m_s1ap_log->console("Error: Found M-TMSI but could not find UE context\n");
return false;
}
}
return true;
}
bool
s1ap_nas_transport::handle_nas_service_request( uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
m_s1ap_log->info("Service request -- S-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->console("Service request -- S-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->info("Service request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
m_s1ap_log->console("Service request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
bool mac_valid = false;
LIBLTE_MME_SERVICE_REQUEST_MSG_STRUCT service_req;
LIBLTE_ERROR_ENUM err = liblte_mme_unpack_service_request_msg((LIBLTE_BYTE_MSG_STRUCT*) nas_msg, &service_req);
if (err !=LIBLTE_SUCCESS) {
m_s1ap_log->error("Could not unpack service request\n");
return false;
}
std::map<uint32_t,uint64_t>::iterator it = m_s1ap->m_tmsi_to_imsi.find(m_tmsi);
if (it == m_s1ap->m_tmsi_to_imsi.end()) {
m_s1ap_log->console("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->error("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
nas nas_tmp;
nas_tmp.m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
nas_tmp.pack_service_reject(reply_buffer);
*reply_flag = true;
return true;
}
nas *nas_ctx = m_s1ap->find_nas_ctx_from_imsi(it->second);
if (nas_ctx == NULL || nas_ctx->m_emm_ctx.state != EMM_STATE_REGISTERED) {
m_s1ap_log->console("UE is not EMM-Registered.\n");
m_s1ap_log->error("UE is not EMM-Registered.\n");
nas_ctx->pack_service_reject(reply_buffer);
*reply_flag = true;
return true;
}
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
sec_ctx_t *sec_ctx = &nas_ctx->m_sec_ctx;
sec_ctx->ul_nas_count++;
mac_valid = nas_ctx->short_integrity_check(nas_msg);
if (mac_valid) {
m_s1ap_log->console("Service Request -- Short MAC valid\n");
m_s1ap_log->info("Service Request -- Short MAC valid\n");
if(ecm_ctx->state == ECM_STATE_CONNECTED) {
m_s1ap_log->error("Service Request -- User is ECM CONNECTED\n");
//Release previous context
m_s1ap_log->info("Service Request -- Releasing previouse ECM context. eNB S1AP Id %d, MME UE S1AP Id %d\n", ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(nas_ctx);
m_s1ap->release_ue_ecm_ctx(ecm_ctx->mme_ue_s1ap_id);
}
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
//UE not connect. Connect normally.
m_s1ap_log->console("Service Request -- User is ECM DISCONNECTED\n");
m_s1ap_log->info("Service Request -- User is ECM DISCONNECTED\n");
//Create ECM context
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Set eNB information
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
memcpy(&ecm_ctx->enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Save whether secure ESM information transfer is necessary
ecm_ctx->eit = false;
//Get UE IP, and uplink F-TEID
if(emm_ctx->ue_ip.s_addr == 0 ){
m_s1ap_log->error("UE has no valid IP assigned upon reception of service request");
}
m_s1ap_log->console("UE previously assigned IP: %s",inet_ntoa(emm_ctx->ue_ip));
//Re-generate K_eNB
srslte::security_generate_k_enb(sec_ctx->k_asme, sec_ctx->ul_nas_count, sec_ctx->k_enb);
m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n", sec_ctx->ul_nas_count);
m_s1ap_log->console("Generating KeNB with UL NAS COUNT: %d\n", sec_ctx->ul_nas_count);
m_s1ap_log->info_hex(sec_ctx->k_enb, 32, "Key eNodeB (k_enb)\n");
m_s1ap_log->console("UE Ctr TEID %d\n", emm_ctx->sgw_ctrl_fteid.teid);
//Save UE ctx to MME UE S1AP id
m_s1ap->add_nas_ctx_to_mme_ue_s1ap_id_map(nas_ctx);
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(nas_ctx, 5);
} else {
m_s1ap_log->console("Service Request -- Short MAC invalid. Ignoring service request\n");
m_s1ap_log->console("Service Request -- Short MAC invalid. Ignoring service request\n");
}
return true;
}
bool
s1ap_nas_transport::handle_nas_detach_request(uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
m_s1ap_log->info("Detach Request -- S-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->console("Detach Request -- S-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->info("Detach Request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
m_s1ap_log->console("Detach Request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
bool mac_valid = false;
LIBLTE_MME_DETACH_REQUEST_MSG_STRUCT detach_req;
LIBLTE_ERROR_ENUM err = liblte_mme_unpack_detach_request_msg((LIBLTE_BYTE_MSG_STRUCT*) nas_msg, &detach_req);
if (err !=LIBLTE_SUCCESS) {
m_s1ap_log->error("Could not unpack detach request\n");
return false;
}
std::map<uint32_t,uint64_t>::iterator it = m_s1ap->m_tmsi_to_imsi.find(m_tmsi);
if (it == m_s1ap->m_tmsi_to_imsi.end()) {
m_s1ap_log->console("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->error("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
return true;
}
nas *nas_ctx = m_s1ap->find_nas_ctx_from_imsi(it->second);
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
sec_ctx_t *sec_ctx = &nas_ctx->m_sec_ctx;
m_mme_gtpc->send_delete_session_request(emm_ctx->imsi);
emm_ctx->state = EMM_STATE_DEREGISTERED;
sec_ctx->ul_nas_count++;
m_s1ap_log->console("Received. M-TMSI 0x%x\n", m_tmsi);
//Received detach request as an initial UE message
//eNB created new ECM context to send the detach request; this needs to be cleared.
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(nas_ctx);
return true;
}
bool
s1ap_nas_transport::handle_nas_tracking_area_update_request(uint32_t m_tmsi,
uint32_t enb_ue_s1ap_id,
srslte::byte_buffer_t *nas_msg,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri)
{
m_s1ap_log->info("Tracking Area Update Request -- S-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->console("Tracking Area Update Request -- S-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->info("Tracking Area Update Request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
m_s1ap_log->console("Tracking Area Update Request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
m_s1ap_log->console("Warning: Tracking area update requests are not handled yet.\n");
m_s1ap_log->warning("Tracking area update requests are not handled yet.\n");
std::map<uint32_t,uint64_t>::iterator it = m_s1ap->m_tmsi_to_imsi.find(m_tmsi);
if (it == m_s1ap->m_tmsi_to_imsi.end()) {
m_s1ap_log->console("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
m_s1ap_log->error("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
return true;
}
nas *nas_ctx = m_s1ap->find_nas_ctx_from_imsi(it->second);
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
sec_ctx_t *sec_ctx = &nas_ctx->m_sec_ctx;
sec_ctx->ul_nas_count++; //Increment the NAS count, not to break the security ctx
return true;
}
bool
s1ap_nas_transport::send_downlink_nas_transport(uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id, srslte::byte_buffer_t *nas_msg, struct sctp_sndrcvinfo enb_sri)
{

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