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Continue to move uplink NAS into nas.cc.

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master
Pedro Alvarez 6 years ago
parent 40d53f8f45
commit 5fd337a7ad
3 changed files with 69 additions and 1891 deletions
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41
srsepc/hdr/mme/s1ap_nas_transport.h
Unescape Escape View File

@ -47,6 +47,47 @@ public:
bool handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *init_ue, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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 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,
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,
srslte::byte_buffer_t *reply_buffer,
bool* reply_flag,
struct sctp_sndrcvinfo *enb_sri);
bool 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);
private:
s1ap_nas_transport();
virtual ~s1ap_nas_transport();

631
srsepc/src/mme/nas.cc
Unescape Escape View File

@ -45,634 +45,7 @@ nas::~nas() {}
*
********************************/
bool
nas::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("Unhandle Mobile Id type in attach request\n");
return false;
}
return true;
}
bool
nas::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)
{
uint8_t k_asme[32];
uint8_t autn[16];
uint8_t rand[16];
uint8_t xres[8];
ue_ctx_t ue_ctx;
ue_emm_ctx_t *emm_ctx = &ue_ctx.emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx.ecm_ctx;
//Set UE's EMM context
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 atached
ue_ctx_t *old_ctx = m_s1ap->find_ue_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->ecm_ctx.mme_ue_s1ap_id!=0)
{
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(&old_ctx->ecm_ctx, reply_buffer);
}
m_s1ap->delete_ue_ctx(imsi);
}
emm_ctx->imsi = imsi;
emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
emm_ctx->state = EMM_STATE_DEREGISTERED;
//Save UE network capabilities
memcpy(&emm_ctx->security_ctxt.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
emm_ctx->security_ctxt.ms_network_cap_present = attach_req.ms_network_cap_present;
if(attach_req.ms_network_cap_present)
{
memcpy(&emm_ctx->security_ctxt.ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
}
uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id; //TODO: Unused
emm_ctx->procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Initialize NAS count
emm_ctx->security_ctxt.ul_nas_count = 0;
emm_ctx->security_ctxt.dl_nas_count = 0;
//Set UE ECM context
ecm_ctx->imsi = emm_ctx->imsi;
ecm_ctx->mme_ue_s1ap_id = emm_ctx->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 = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
ecm_ctx->erabs_ctx[i].erab_id = i;
}
//Log Attach Request information
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", emm_ctx->imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", emm_ctx->imsi);
m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
m_s1ap_log->info("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
m_s1ap_log->console("Attach request -- Attach type: %d\n", attach_req.eps_attach_type);
m_s1ap_log->info("Attach request -- Attach type: %d\n", attach_req.eps_attach_type);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EEA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eea[0],
attach_req.ue_network_cap.eea[1],
attach_req.ue_network_cap.eea[2],
attach_req.ue_network_cap.eea[3],
attach_req.ue_network_cap.eea[4],
attach_req.ue_network_cap.eea[5],
attach_req.ue_network_cap.eea[6],
attach_req.ue_network_cap.eea[7]);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EIA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eia[0],
attach_req.ue_network_cap.eia[1],
attach_req.ue_network_cap.eia[2],
attach_req.ue_network_cap.eia[3],
attach_req.ue_network_cap.eia[4],
attach_req.ue_network_cap.eia[5],
attach_req.ue_network_cap.eia[6],
attach_req.ue_network_cap.eia[7]);
m_s1ap_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
m_s1ap_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
m_s1ap_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
m_s1ap_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
//Save attach request type
emm_ctx->attach_type = attach_req.eps_attach_type;
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer(emm_ctx->imsi, emm_ctx->security_ctxt.k_asme, autn, rand, emm_ctx->security_ctxt.xres))
{
m_s1ap_log->console("User not found. IMSI %015lu\n",emm_ctx->imsi);
m_s1ap_log->info("User not found. IMSI %015lu\n",emm_ctx->imsi);
return false;
}
//Allocate eKSI for this authentication vector
//Here we assume a new security context thus a new eKSI
emm_ctx->security_ctxt.eksi=0;
//Save the UE context
ue_ctx_t *new_ctx = new ue_ctx_t;
memcpy(new_ctx,&ue_ctx,sizeof(ue_ctx_t));
m_s1ap->add_ue_ctx_to_imsi_map(new_ctx);
m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(new_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_ue_s1ap_id);
//Pack NAS Authentication Request in Downlink NAS Transport msg
pack_authentication_request(reply_buffer, ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id, emm_ctx->security_ctxt.eksi, autn, rand);
//Send reply to eNB
*reply_flag = true;
m_s1ap_log->info("Downlink NAS: Sending Authentication Request\n");
m_s1ap_log->console("Downlink NAS: Sending Authentication Request\n");
return true;
}
bool
nas::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())
{
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);
//Could not find IMSI from M-TMSI, send Id request
ue_ctx_t ue_ctx;
ue_emm_ctx_t *emm_ctx = &ue_ctx.emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx.ecm_ctx;
//We do not know the IMSI of the UE yet
//The IMSI will be set when the identity response is received
//Set EMM ctx
emm_ctx->imsi = 0;
emm_ctx->state = EMM_STATE_DEREGISTERED;
emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Save UE network capabilities
memcpy(&emm_ctx->security_ctxt.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
emm_ctx->security_ctxt.ms_network_cap_present = attach_req.ms_network_cap_present;
if(attach_req.ms_network_cap_present)
{
memcpy(&emm_ctx->security_ctxt.ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
}
//Initialize NAS count
emm_ctx->security_ctxt.ul_nas_count = 0;
emm_ctx->security_ctxt.dl_nas_count = 0;
emm_ctx->procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Set ECM context
ecm_ctx->imsi = 0;
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
ecm_ctx->mme_ue_s1ap_id = emm_ctx->mme_ue_s1ap_id;
uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id; //TODO: Unused
//Save attach request type
emm_ctx->attach_type = attach_req.eps_attach_type;
//Save whether ESM information transfer is necessary
ecm_ctx->eit = pdn_con_req.esm_info_transfer_flag_present;
//Add eNB info to UE ctxt
memcpy(&ecm_ctx->enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
ecm_ctx->erabs_ctx[i].erab_id = i;
}
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", ecm_ctx->imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", ecm_ctx->imsi);
m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EEA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eea[0], attach_req.ue_network_cap.eea[1], attach_req.ue_network_cap.eea[2], attach_req.ue_network_cap.eea[3],
attach_req.ue_network_cap.eea[4], attach_req.ue_network_cap.eea[5], attach_req.ue_network_cap.eea[6], attach_req.ue_network_cap.eea[7]);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EIA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eia[0], attach_req.ue_network_cap.eia[1], attach_req.ue_network_cap.eia[2], attach_req.ue_network_cap.eia[3],
attach_req.ue_network_cap.eia[4], attach_req.ue_network_cap.eia[5], attach_req.ue_network_cap.eia[6], attach_req.ue_network_cap.eia[7]);
m_s1ap_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
m_s1ap_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
m_s1ap_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
m_s1ap_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
m_s1ap_log->console("Could not find M-TMSI=0x%x. Sending ID request\n",m_tmsi);
m_s1ap_log->info("Could not find M-TMSI=0x%x. Sending Id Request\n", m_tmsi);
//Store temporary ue context
ue_ctx_t *new_ctx = new ue_ctx_t;
memcpy(new_ctx,&ue_ctx,sizeof(ue_ctx_t));
m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(new_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_ue_s1ap_id);
pack_identity_request(reply_buffer, ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
*reply_flag = true;
return true;
}
else{
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
ue_ctx_t *ue_ctx = m_s1ap->find_ue_ctx_from_imsi(it->second);
if(ue_ctx!=NULL)
{
ue_emm_ctx_t *emm_ctx = &ue_ctx->emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
m_s1ap_log->console("Found UE context. IMSI: %015lu, old eNB UE S1ap Id %d, old MME UE S1AP Id %d\n",emm_ctx->imsi, ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
//Check NAS integrity
bool msg_valid = false;
emm_ctx->security_ctxt.ul_nas_count++;
msg_valid = integrity_check(emm_ctx,nas_msg);
if(msg_valid == true && emm_ctx->state == EMM_STATE_DEREGISTERED)
{
m_s1ap_log->console("GUTI Attach Integrity valid. UL count %d, DL count %d\n",emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.dl_nas_count);
//Create new MME UE S1AP Identity
emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
ecm_ctx->mme_ue_s1ap_id = emm_ctx->mme_ue_s1ap_id;
ecm_ctx->enb_ue_s1ap_id = enb_ue_s1ap_id;
ecm_ctx->imsi = ecm_ctx->imsi;
emm_ctx->procedure_transaction_id = pdn_con_req.proc_transaction_id;
//Save Attach type
emm_ctx->attach_type = attach_req.eps_attach_type;
//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 = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
ecm_ctx->erabs_ctx[i].erab_id = i;
}
//Store context based on MME UE S1AP id
m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(ue_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_ue_s1ap_id);
//Re-generate K_eNB
srslte::security_generate_k_enb(emm_ctx->security_ctxt.k_asme, emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.k_enb);
m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
m_s1ap_log->console("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
m_s1ap_log->info_hex(emm_ctx->security_ctxt.k_enb, 32, "Key eNodeB (k_enb)\n");
m_s1ap_log->console("Attach request -- IMSI: %015lu\n", ecm_ctx->imsi);
m_s1ap_log->info("Attach request -- IMSI: %015lu\n", ecm_ctx->imsi);
m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EEA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eea[0], attach_req.ue_network_cap.eea[1], attach_req.ue_network_cap.eea[2], attach_req.ue_network_cap.eea[3],
attach_req.ue_network_cap.eea[4], attach_req.ue_network_cap.eea[5], attach_req.ue_network_cap.eea[6], attach_req.ue_network_cap.eea[7]);
m_s1ap_log->console("Attach Request -- UE Network Capabilities EIA: %d%d%d%d%d%d%d%d\n",
attach_req.ue_network_cap.eia[0], attach_req.ue_network_cap.eia[1], attach_req.ue_network_cap.eia[2], attach_req.ue_network_cap.eia[3],
attach_req.ue_network_cap.eia[4], attach_req.ue_network_cap.eia[5], attach_req.ue_network_cap.eia[6], attach_req.ue_network_cap.eia[7]);
m_s1ap_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
m_s1ap_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
m_s1ap_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
m_s1ap_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
//Create session request
m_s1ap_log->console("GUTI Attach -- NAS Integrity OK.\n");
if(ecm_ctx->eit)
{
m_s1ap_log->console("Secure ESM information transfer requested.\n");
m_s1ap_log->info("Secure ESM information transfer requested.\n");
pack_esm_information_request(reply_buffer, emm_ctx, ecm_ctx);
*reply_flag = true;
}
else
{
//Get subscriber info from HSS
uint8_t default_bearer=5;
m_hss->gen_update_loc_answer(emm_ctx->imsi,&ue_ctx->ecm_ctx.erabs_ctx[default_bearer].qci);
m_s1ap_log->debug("Getting subscription information -- QCI %d\n", ue_ctx->ecm_ctx.erabs_ctx[default_bearer].qci);
m_s1ap_log->console("Getting subscription information -- QCI %d\n", ue_ctx->ecm_ctx.erabs_ctx[default_bearer].qci);
m_mme_gtpc->send_create_session_request(emm_ctx->imsi);
*reply_flag = false; //No reply needed
}
return true;
}
else
{
if(emm_ctx->state != EMM_STATE_DEREGISTERED)
{
m_s1ap_log->error("Received GUTI-Attach Request from attached user.\n");
m_s1ap_log->console("Received GUTI-Attach Request from attached user.\n");
//Delete previous Ctx, restart authentication
//Detaching previoulsy attached UE.
m_mme_gtpc->send_delete_session_request(emm_ctx->imsi);
if(ecm_ctx->mme_ue_s1ap_id!=0)
{
m_s1ap->m_s1ap_ctx_mngmt_proc->send_ue_context_release_command(ecm_ctx, reply_buffer);
}
}
emm_ctx->security_ctxt.ul_nas_count = 0;
emm_ctx->security_ctxt.dl_nas_count = 0;
//Create new MME UE S1AP Identity
uint32_t new_mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
//Make sure context from previous NAS connections is not present
if(ecm_ctx->mme_ue_s1ap_id!=0)
{
m_s1ap->release_ue_ecm_ctx(ecm_ctx->mme_ue_s1ap_id);
}
emm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
ecm_ctx->mme_ue_s1ap_id = emm_ctx->mme_ue_s1ap_id;
//Set EMM as de-registered
emm_ctx->state = EMM_STATE_DEREGISTERED;
//Save Attach type
emm_ctx->attach_type = attach_req.eps_attach_type;
//Set UE ECM context
ecm_ctx->imsi = ecm_ctx->imsi;
ecm_ctx->mme_ue_s1ap_id = ecm_ctx->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 = pdn_con_req.esm_info_transfer_flag_present;
//Initialize E-RABs
for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
ecm_ctx->erabs_ctx[i].erab_id = i;
}
//Store context based on MME UE S1AP id
m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(ue_ctx);
m_s1ap->add_ue_to_enb_set(enb_sri->sinfo_assoc_id,ecm_ctx->mme_ue_s1ap_id);
//NAS integrity failed. Re-start authentication process.
m_s1ap_log->console("GUTI Attach request NAS integrity failed.\n");
m_s1ap_log->console("RE-starting authentication procedure.\n");
uint8_t autn[16];
uint8_t rand[16];
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer(emm_ctx->imsi, emm_ctx->security_ctxt.k_asme, autn, rand, emm_ctx->security_ctxt.xres))
{
m_s1ap_log->console("User not found. IMSI %015lu\n",emm_ctx->imsi);
m_s1ap_log->info("User not found. IMSI %015lu\n",emm_ctx->imsi);
return false;
}
//Restarting security context. Reseting eKSI to 0.
emm_ctx->security_ctxt.eksi=0;
pack_authentication_request(reply_buffer, ecm_ctx->enb_ue_s1ap_id, ecm_ctx->mme_ue_s1ap_id, emm_ctx->security_ctxt.eksi, autn, rand);
//Send reply to eNB
*reply_flag = true;
m_s1ap_log->info("Downlink NAS: Sent Authentication Request\n");
m_s1ap_log->console("Downlink NAS: Sent Authentication Request\n");
return true;
}
}
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
nas::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)
{
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);
pack_service_reject(reply_buffer, LIBLTE_MME_EMM_CAUSE_IMPLICITLY_DETACHED, enb_ue_s1ap_id);
*reply_flag = true;
return true;
}
ue_ctx_t *ue_ctx = m_s1ap->find_ue_ctx_from_imsi(it->second);
if(ue_ctx == NULL || ue_ctx->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");
pack_service_reject(reply_buffer, LIBLTE_MME_EMM_CAUSE_IMPLICITLY_DETACHED, enb_ue_s1ap_id);
*reply_flag = true;
return true;
}
ue_emm_ctx_t *emm_ctx = &ue_ctx->emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
emm_ctx->security_ctxt.ul_nas_count++;
mac_valid = short_integrity_check(emm_ctx,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(ecm_ctx,reply_buffer);
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->imsi = emm_ctx->imsi;
ecm_ctx->mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id();
emm_ctx->mme_ue_s1ap_id = ecm_ctx->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(emm_ctx->security_ctxt.k_asme, emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.k_enb);
m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
m_s1ap_log->console("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
m_s1ap_log->info_hex(emm_ctx->security_ctxt.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_ue_ctx_to_mme_ue_s1ap_id_map(ue_ctx);
m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx,&ecm_ctx->erabs_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
nas::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)
{
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;
}
ue_ctx_t *ue_ctx = m_s1ap->find_ue_ctx_from_imsi(it->second);
ue_emm_ctx_t *emm_ctx = &ue_ctx->emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
m_mme_gtpc->send_delete_session_request(emm_ctx->imsi);
emm_ctx->state = EMM_STATE_DEREGISTERED;
emm_ctx->security_ctxt.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(ecm_ctx, reply_buffer);
return true;
}
bool
nas::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->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;
}
ue_ctx_t *ue_ctx = m_s1ap->find_ue_ctx_from_imsi(it->second);
ue_emm_ctx_t *emm_ctx = &ue_ctx->emm_ctx;
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
emm_ctx->security_ctxt.ul_nas_count++;//Increment the NAS count, not to break the security ctx
return true;
}
//FIXME Move UE Initiating mesages from s1ap_nas_transport
/*
*
@ -680,7 +53,7 @@ nas::handle_nas_tracking_area_update_request(uint32_t m_tmsi,
*
*/
//FIXME re-factor to reduce code duplication
//FIXME re-factor to reduce code duplication for messages that can be both initiating messages and uplink NAS messages
bool
nas::handle_nas_detach_request(srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_msg, bool *reply_flag)
{

1288
srsepc/src/mme/s1ap_nas_transport.cc
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