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Changed service request to nas.cc

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master
Pedro Alvarez 6 years ago
parent 4313fb1e72
commit a9e5b3b8e9
3 changed files with 127 additions and 16 deletions
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27
srsepc/hdr/mme/nas.h
Unescape Escape View File

@ -212,18 +212,27 @@ public:
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
//Tracking area update request messages
//
/* 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_nas_detach_request (srslte::byte_buffer_t *nas_rx);
/* Downlink NAS messages packing */
bool pack_authentication_request (srslte::byte_buffer_t *nas_buffer);

109
srsepc/src/mme/nas.cc
Unescape Escape View File

@ -505,6 +505,115 @@ nas::handle_guti_attach_request_known_ue( nas *nas_ctx,
}
//Service Requests
bool nas::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)
{
nas_log->info("Service request -- S-TMSI 0x%x\n", m_tmsi);
nas_log->console("Service request -- S-TMSI 0x%x\n", m_tmsi);
nas_log->info("Service request -- eNB UE S1AP Id %d\n", enb_ue_s1ap_id);
nas_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;
srslte::byte_buffer_pool *pool = srslte::byte_buffer_pool::get_instance();
LIBLTE_ERROR_ENUM err = liblte_mme_unpack_service_request_msg((LIBLTE_BYTE_MSG_STRUCT*) nas_rx, &service_req);
if (err !=LIBLTE_SUCCESS) {
nas_log->error("Could not unpack service request\n");
return false;
}
uint64_t imsi = s1ap->find_imsi_from_m_tmsi(m_tmsi);
if (imsi == 0) {
nas_log->console("Could not find IMSI from M-TMSI. M-TMSI 0x%x\n", m_tmsi);
nas_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.m_ecm_ctx.mme_ue_s1ap_id = s1ap->get_next_mme_ue_s1ap_id();
srslte::byte_buffer_t *nas_tx = pool->allocate();
nas_tmp.pack_service_reject(nas_tx);
s1ap->send_downlink_nas_transport(enb_ue_s1ap_id, nas_tmp.m_ecm_ctx.mme_ue_s1ap_id, nas_tx, *enb_sri);
pool->deallocate(nas_tx);
return true;
}
nas *nas_ctx = s1ap->find_nas_ctx_from_imsi(imsi);
if (nas_ctx == NULL || nas_ctx->m_emm_ctx.state != EMM_STATE_REGISTERED) {
nas_log->console("UE is not EMM-Registered.\n");
nas_log->error("UE is not EMM-Registered.\n");
nas nas_tmp;
nas_tmp.m_ecm_ctx.enb_ue_s1ap_id = enb_ue_s1ap_id;
nas_tmp.m_ecm_ctx.mme_ue_s1ap_id = s1ap->get_next_mme_ue_s1ap_id();
srslte::byte_buffer_t *nas_tx = pool->allocate();
nas_tmp.pack_service_reject(nas_tx);
s1ap->send_downlink_nas_transport(enb_ue_s1ap_id, nas_tmp.m_ecm_ctx.mme_ue_s1ap_id, nas_tx, *enb_sri);
pool->deallocate(nas_tx);
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_rx);
if (mac_valid) {
nas_log->console("Service Request -- Short MAC valid\n");
nas_log->info("Service Request -- Short MAC valid\n");
if(ecm_ctx->state == ECM_STATE_CONNECTED) {
nas_log->error("Service Request -- User is ECM CONNECTED\n");
//Release previous context
nas_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);
s1ap->send_ue_context_release_command(ecm_ctx->mme_ue_s1ap_id);
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.
nas_log->console("Service Request -- User is ECM DISCONNECTED\n");
nas_log->info("Service Request -- User is ECM DISCONNECTED\n");
//Create ECM context
ecm_ctx->mme_ue_s1ap_id = 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 ){
nas_log->error("UE has no valid IP assigned upon reception of service request");
}
nas_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);
nas_log->info("Generating KeNB with UL NAS COUNT: %d\n", sec_ctx->ul_nas_count);
nas_log->console("Generating KeNB with UL NAS COUNT: %d\n", sec_ctx->ul_nas_count);
nas_log->info_hex(sec_ctx->k_enb, 32, "Key eNodeB (k_enb)\n");
nas_log->console("UE Ctr TEID %d\n", emm_ctx->sgw_ctrl_fteid.teid);
//Save UE ctx to MME UE S1AP id
s1ap->add_nas_ctx_to_mme_ue_s1ap_id_map(nas_ctx);
s1ap->send_initial_context_setup_request(imsi,5);
} else {
nas_log->console("Service Request -- Short MAC invalid. Ignoring service request\n");
nas_log->console("Service Request -- Short MAC invalid. Ignoring service request\n");
}
return true;
}
/***************************************
*

7
srsepc/src/mme/s1ap_nas_transport.cc
Unescape Escape View File

@ -294,13 +294,6 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
m_pool->deallocate(nas_msg);
return false;
}
if (*reply_flag == true) {
m_s1ap_log->console("DL NAS: Sent Downlink NAS Message. DL NAS Count=%d, UL NAS count=%d\n", sec_ctx->dl_nas_count, sec_ctx->ul_nas_count);
m_s1ap_log->info("DL NAS: Sent Downlink NAS message. DL NAS Count=%d, UL NAS count=%d\n", sec_ctx->dl_nas_count, sec_ctx->ul_nas_count);
m_s1ap_log->info("DL NAS: MME UE S1AP id %d\n",ecm_ctx->mme_ue_s1ap_id);
m_s1ap_log->console("DL NAS: MME UE S1AP id %d\n",ecm_ctx->mme_ue_s1ap_id);
}
m_pool->deallocate(nas_msg);
return true;
}

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