diff --git a/srsepc/hdr/mme/s1ap_nas_transport.h b/srsepc/hdr/mme/s1ap_nas_transport.h index de1d67551..e37ce4d61 100644 --- a/srsepc/hdr/mme/s1ap_nas_transport.h +++ b/srsepc/hdr/mme/s1ap_nas_transport.h @@ -72,8 +72,6 @@ public: bool handle_identity_response(srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_msg, bool *reply_flag); bool handle_tracking_area_update_request(srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_msg, bool *reply_flag); - bool unpack_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *init_ue, LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT *attach_req, LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT *pdn_con_req); - bool pack_authentication_request(srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t next_mme_ue_s1ap_id, uint8_t *autn,uint8_t *rand); bool pack_authentication_reject(srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id); bool unpack_authentication_response(LIBLTE_S1AP_MESSAGE_UPLINKNASTRANSPORT_STRUCT *ul_xport, LIBLTE_MME_AUTHENTICATION_RESPONSE_MSG_STRUCT *auth_resp); diff --git a/srsepc/src/mme/s1ap_nas_transport.cc b/srsepc/src/mme/s1ap_nas_transport.cc index fb8687277..0277b3763 100644 --- a/srsepc/src/mme/s1ap_nas_transport.cc +++ b/srsepc/src/mme/s1ap_nas_transport.cc @@ -113,12 +113,6 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA m_pool->deallocate(nas_msg); return false; } - /* if(!unpack_initial_ue_message(init_ue, &attach_req,&pdn_con_req)) - { - //Could not decode the attach request and the PDN connectivity request. - m_s1ap_log->error("Could not unpack NAS Attach Request and PDN connectivity request.\n"); - return false; - }*/ handle_nas_attach_request(enb_ue_s1ap_id, attach_req,pdn_con_req,reply_buffer,reply_flag, enb_sri); } else if(msg_type == LIBLTE_MME_SECURITY_HDR_TYPE_SERVICE_REQUEST) @@ -129,130 +123,7 @@ s1ap_nas_transport::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSA return false; } m_pool->deallocate(nas_msg); - return true; - /* - //Create basic UE Ctx - ue_ctx_t *ue_ctx_ptr = &ue_ctx; - ue_ctx.imsi = 0; - ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id(); - //Get UE network capabilities - memcpy(&ue_ctx.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT)); - ue_ctx.ms_network_cap_present = attach_req.ms_network_cap_present; - if(attach_req.ms_network_cap_present) - { - memcpy(&ue_ctx.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 - ue_ctx.procedure_transaction_id = pdn_con_req.proc_transaction_id; - //Save whether ESM information transfer is necessary - ue_ctx.eit = pdn_con_req.esm_info_transfer_flag_present; - //m_s1ap_log->console("EPS Bearer id: %d\n", eps_bearer_id); - //Initialize NAS count - ue_ctx.security_ctxt.ul_nas_count = 0; - ue_ctx.security_ctxt.dl_nas_count = 0; - //Add eNB info to UE ctxt - memcpy(&ue_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo)); - //Initialize E-RABs - for(uint i = 0 ; i< MAX_ERABS_PER_UE; i++) - { - ue_ctx.erabs_ctx[i].state = ERAB_DEACTIVATED; - ue_ctx.erabs_ctx[i].erab_id = i; - } - //Get UE Identity - if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_IMSI) - { - //IMSI style attach - imsi = 0; - for(int i=0;i<=14;i++){ - imsi += attach_req.eps_mobile_id.imsi[i]*std::pow(10,14-i); - } - m_s1ap_log->console("Attach Request -- IMSI-style attach request\n"); - } - else if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_GUTI) - { - //GUTI style attach - m_s1ap_log->console("Attach Request -- GUTI-style attach request\n"); - uint32_t m_tmsi = attach_req.eps_mobile_id.guti.m_tmsi; - std::map::iterator it = m_s1ap->m_tmsi_to_s1ap_id.find(m_tmsi); - if(it == m_s1ap->m_tmsi_to_s1ap_id.end()) - { - //Could not find IMSI from M-TMSI, send Id request - m_s1ap_log->console("Attach Request -- Could not find M-TMSI=0x%x. Sending ID request\n",m_tmsi); - m_s1ap_log->info("Attach Request -- Could not find M-TMSI=0x%d. Sending Id Request\n", m_tmsi); - ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id(); - m_s1ap->add_new_ue_ctx(ue_ctx); - pack_identity_request(reply_buffer, ue_ctx.enb_ue_s1ap_id, ue_ctx.mme_ue_s1ap_id); - *reply_flag = true; - return true; - } - m_s1ap_log->console("Found M-TMSI: %d\n",m_tmsi); - ue_ctx_ptr = m_s1ap->find_ue_ctx(it->second); - if(ue_ctx_ptr!=NULL) - { - m_s1ap_log->console("Found UE context. IMSI: %015lu\n",ue_ctx_ptr->imsi); - imsi = ue_ctx_ptr->imsi; - m_mme_gtpc->send_create_session_request(ue_ctx_ptr->imsi, ue_ctx_ptr->mme_ue_s1ap_id); - *reply_flag = false; //No reply needed - return true; - } - else - { - m_s1ap_log->error("Found M-TMSI but could not find UE context\n"); - return false; - } - } - m_s1ap_log->console("Attach request -- IMSI: %015lu\n", imsi); - m_s1ap_log->info("Attach request -- IMSI: %015lu\n", imsi); - m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ue_ctx_ptr->enb_ue_s1ap_id, ue_ctx_ptr->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"); - - //Get Authentication Vectors from HSS - if(!m_hss->gen_auth_info_answer(imsi, ue_ctx_ptr->security_ctxt.k_asme, autn, rand, ue_ctx_ptr->security_ctxt.xres)) - { - m_s1ap_log->console("User not found. IMSI %015lu\n",imsi); - m_s1ap_log->info("User not found. IMSI %015lu\n",imsi); - return false; - } - - //Save UE context - //ue_ctx.imsi = imsi; - if(attach_req.eps_mobile_id.type_of_id == LIBLTE_MME_EPS_MOBILE_ID_TYPE_IMSI) - { - //IMSI attach requeires new UE ctxt - ue_ctx.mme_ue_s1ap_id = m_s1ap->get_next_mme_ue_s1ap_id(); - m_s1ap->add_new_ue_ctx(ue_ctx); - } - //Pack NAS Authentication Request in Downlink NAS Transport msg - pack_authentication_request(reply_buffer, ue_ctx_ptr->enb_ue_s1ap_id, ue_ctx_ptr->mme_ue_s1ap_id, autn, rand); - - //Send reply to eNB - *reply_flag = true; - m_s1ap_log->info("Sending Athentication Request\n"); - m_s1ap_log->console("Sending Athentication Request\n"); - //TODO Start T3460 Timer! - */ return true; } @@ -815,57 +686,6 @@ s1ap_nas_transport::handle_tracking_area_update_request(srslte::byte_buffer_t *n /*Packing/Unpacking helper functions*/ -bool -s1ap_nas_transport::unpack_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *init_ue, - LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT *attach_req, - LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT *pdn_con_req ) -{ - - /*Get NAS Attach Request Message*/ - uint8_t pd, msg_type; - srslte::byte_buffer_t *nas_msg = m_pool->allocate(); - - 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; - liblte_mme_parse_msg_header((LIBLTE_BYTE_MSG_STRUCT *) nas_msg, &pd, &msg_type); - - if(msg_type!=LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST){ - m_s1ap_log->error("Unhandled NAS message within the Initial UE message\n"); - return false; - } - - 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]); - return false; - } - /*Log unhandled Attach Request IEs*/ - log_unhandled_attach_request_ies(attach_req); - - /*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]); - return false; - } - - if(pdn_con_req->pdn_type == LIBLTE_MME_PDN_TYPE_IPV6) - { - m_s1ap_log->error("PDN Connectivity Request: Only IPv4 connectivity supported.\n"); - return false; - } - if(pdn_con_req->request_type != LIBLTE_MME_REQUEST_TYPE_INITIAL_REQUEST) - { - m_s1ap_log->error("PDN Connectivity Request: Only Initial Request supported.\n"); - return false; - } - /*Log unhandled PDN connectivity request IEs*/ - log_unhandled_pdn_con_request_ies(pdn_con_req); - - m_pool->deallocate(nas_msg); - return true; -} - bool s1ap_nas_transport::pack_authentication_request(srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t next_mme_ue_s1ap_id, uint8_t *autn, uint8_t *rand) {