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293 lines
13 KiB
C++
293 lines
13 KiB
C++
/*
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* Copyright 2013-2019 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#ifndef SRSEPC_NAS_H
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#define SRSEPC_NAS_H
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#include "srslte/asn1/gtpc_ies.h"
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#include "srslte/asn1/liblte_mme.h"
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#include "srslte/asn1/liblte_s1ap.h"
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#include "srslte/common/buffer_pool.h"
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#include "srslte/common/security.h"
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#include "srslte/interfaces/epc_interfaces.h"
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#include <netinet/sctp.h>
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namespace srsepc {
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static const uint8_t MAX_ERABS_PER_UE = 16;
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// MME EMM states (3GPP 24.301 v10.0.0, section 5.1.3.4)
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typedef enum {
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EMM_STATE_DEREGISTERED = 0,
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EMM_STATE_COMMON_PROCEDURE_INITIATED,
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EMM_STATE_REGISTERED,
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EMM_STATE_DEREGISTERED_INITIATED,
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EMM_STATE_N_ITEMS,
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} emm_state_t;
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static const char emm_state_text[EMM_STATE_N_ITEMS][100] = {"DEREGISTERED", "COMMON PROCEDURE INITIATED", "REGISTERED",
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"DEREGISTERED INITIATED"};
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// MME ECM states (3GPP 23.401 v10.0.0, section 4.6.3)
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typedef enum {
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ECM_STATE_IDLE = 0,
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ECM_STATE_CONNECTED,
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ECM_STATE_N_ITEMS,
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} ecm_state_t;
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static const char ecm_state_text[ECM_STATE_N_ITEMS][100] = {"IDLE", "CONNECTED"};
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/*
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// MME ESM states (3GPP 23.401 v10.0.0, section 4.6.3)
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typedef enum {
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ESM_BEARER_CONTEXT_INACTIVE = 0,
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ESM_BEARER_CONTEXT_ACTIVE_PENDING,
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ESM_BEARER_CONTEXT_ACTIVE,
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ESM_BEARER_CONTEXT_INACTIVE_PENDING,
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ESM_BEARER_CONTEXT_MODIFY_PENDING,
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ESM_BEARER_PROCEDURE_TRANSACTION_INACTIVE,
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ESM_BEARER_PROCEDURE_TRANSACTION_PENDING,
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ESM_STATE_N_ITEMS,
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} esm_state_t;
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static const char esm_state_text[ESM_STATE_N_ITEMS][100] = {"CONTEXT INACTIVE",
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"CONTEXT ACTIVE PENDING",
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"CONTEXT ACTIVE",
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"CONTEXT_INACTIVE_PENDING",
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"CONTEXT_MODIFY_PENDING",
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"PROCEDURE_TRANSACTION_INACTIVE"
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"PROCEDURE_TRANSACTION_PENDING"};
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*/
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typedef enum { ERAB_DEACTIVATED, ERAB_CTX_REQUESTED, ERAB_CTX_SETUP, ERAB_ACTIVE } esm_state_t;
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/*
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* EMM, ECM, ESM and EPS Security context definitions
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*/
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typedef struct {
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uint64_t imsi;
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emm_state_t state;
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uint8_t procedure_transaction_id;
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uint8_t attach_type;
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struct in_addr ue_ip;
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srslte::gtpc_f_teid_ie sgw_ctrl_fteid;
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} emm_ctx_t;
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typedef struct {
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ecm_state_t state;
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uint32_t enb_ue_s1ap_id;
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uint32_t mme_ue_s1ap_id;
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struct sctp_sndrcvinfo enb_sri;
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bool eit;
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} ecm_ctx_t;
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typedef struct {
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uint8_t erab_id;
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esm_state_t state;
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uint8_t qci;
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srslte::gtpc_f_teid_ie enb_fteid;
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srslte::gtpc_f_teid_ie sgw_s1u_fteid;
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srslte::gtpc_pdn_address_allocation_ie pdn_addr_alloc;
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} esm_ctx_t;
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typedef struct {
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uint8_t eksi;
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uint8_t k_asme[32];
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uint8_t autn[16];
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uint8_t rand[16];
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uint8_t xres[16]; // minimum 6, maximum 16
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uint32_t dl_nas_count;
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uint32_t ul_nas_count;
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srslte::CIPHERING_ALGORITHM_ID_ENUM cipher_algo;
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srslte::INTEGRITY_ALGORITHM_ID_ENUM integ_algo;
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uint8_t k_nas_enc[32];
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uint8_t k_nas_int[32];
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uint8_t k_enb[32];
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LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT ue_network_cap;
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bool ms_network_cap_present;
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LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT ms_network_cap;
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LIBLTE_MME_EPS_MOBILE_ID_GUTI_STRUCT guti;
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} sec_ctx_t;
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/*
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* NAS Initialization Arguments
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*/
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typedef struct {
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uint16_t mcc;
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uint16_t mnc;
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uint8_t mme_code;
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uint16_t mme_group;
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uint16_t tac;
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uint16_t paging_timer;
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std::string apn;
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std::string dns;
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srslte::CIPHERING_ALGORITHM_ID_ENUM cipher_algo;
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srslte::INTEGRITY_ALGORITHM_ID_ENUM integ_algo;
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} nas_init_t;
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typedef struct {
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s1ap_interface_nas* s1ap;
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gtpc_interface_nas* gtpc;
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hss_interface_nas* hss;
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mme_interface_nas* mme;
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} nas_if_t;
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class nas
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{
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public:
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nas(nas_init_t args, nas_if_t itf, srslte::log* nas_log);
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void reset();
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/***********************
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* Initial UE messages *
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***********************/
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// Attach request messages
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static bool handle_attach_request(uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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srslte::byte_buffer_t* nas_rx,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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static bool handle_imsi_attach_request_unknown_ue(uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT& attach_req,
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const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT& pdn_con_req,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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static bool handle_imsi_attach_request_known_ue(nas* nas_ctx,
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uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT& attach_req,
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const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT& pdn_con_req,
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srslte::byte_buffer_t* nas_rx,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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static bool handle_guti_attach_request_unknown_ue(uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT& attach_req,
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const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT& pdn_con_req,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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static bool handle_guti_attach_request_known_ue(nas* nas_ctx,
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uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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const LIBLTE_MME_ATTACH_REQUEST_MSG_STRUCT& attach_req,
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const LIBLTE_MME_PDN_CONNECTIVITY_REQUEST_MSG_STRUCT& pdn_con_req,
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srslte::byte_buffer_t* nas_rx,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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// Service request messages
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static bool handle_service_request(uint32_t m_tmsi,
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uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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srslte::byte_buffer_t* nas_rx,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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// Dettach request messages
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static bool handle_detach_request(uint32_t m_tmsi,
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uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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srslte::byte_buffer_t* nas_rx,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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// Tracking area update request messages
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static bool handle_tracking_area_update_request(uint32_t m_tmsi,
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uint32_t enb_ue_s1ap_id,
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struct sctp_sndrcvinfo* enb_sri,
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srslte::byte_buffer_t* nas_rx,
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nas_init_t args,
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nas_if_t itf,
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srslte::log* nas_log);
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/* Uplink NAS messages handling */
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bool handle_attach_request(srslte::byte_buffer_t* nas_rx);
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bool handle_authentication_response(srslte::byte_buffer_t* nas_rx);
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bool handle_security_mode_complete(srslte::byte_buffer_t* nas_rx);
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bool handle_attach_complete(srslte::byte_buffer_t* nas_rx);
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bool handle_esm_information_response(srslte::byte_buffer_t* nas_rx);
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bool handle_identity_response(srslte::byte_buffer_t* nas_rx);
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bool handle_tracking_area_update_request(srslte::byte_buffer_t* nas_rx);
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bool handle_authentication_failure(srslte::byte_buffer_t* nas_rx);
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bool handle_detach_request(srslte::byte_buffer_t* nas_rx);
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/* Downlink NAS messages packing */
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bool pack_authentication_request(srslte::byte_buffer_t* nas_buffer);
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bool pack_authentication_reject(srslte::byte_buffer_t* nas_buffer);
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bool pack_security_mode_command(srslte::byte_buffer_t* nas_buffer);
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bool pack_esm_information_request(srslte::byte_buffer_t* nas_buffer);
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bool pack_identity_request(srslte::byte_buffer_t* nas_buffer);
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bool pack_emm_information(srslte::byte_buffer_t* nas_buffer);
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bool pack_service_reject(srslte::byte_buffer_t* nas_buffer, uint8_t emm_cause);
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bool pack_attach_accept(srslte::byte_buffer_t* nas_buffer);
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/* Security functions */
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bool integrity_check(srslte::byte_buffer_t* pdu);
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bool short_integrity_check(srslte::byte_buffer_t* pdu);
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void integrity_generate(srslte::byte_buffer_t* pdu, uint8_t* mac);
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void cipher_decrypt(srslte::byte_buffer_t* pdu);
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void cipher_encrypt(srslte::byte_buffer_t* pdu);
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/*Timer functions*/
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bool start_timer(enum nas_timer_type type);
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bool expire_timer(enum nas_timer_type type);
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/* UE Context */
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emm_ctx_t m_emm_ctx;
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ecm_ctx_t m_ecm_ctx;
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esm_ctx_t m_esm_ctx[MAX_ERABS_PER_UE];
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sec_ctx_t m_sec_ctx;
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private:
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srslte::byte_buffer_pool* m_pool;
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srslte::log* m_nas_log;
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gtpc_interface_nas* m_gtpc;
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s1ap_interface_nas* m_s1ap;
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hss_interface_nas* m_hss;
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mme_interface_nas* m_mme;
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uint16_t m_mcc;
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uint16_t m_mnc;
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uint16_t m_mme_group;
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uint16_t m_mme_code;
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uint16_t m_tac;
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std::string m_apn;
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std::string m_dns;
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// Timers timeout values
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uint16_t m_t3413;
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// Timer functions
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bool start_t3413();
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bool expire_t3413();
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};
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} // namespace srsepc
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#endif // SRSEPC_NAS_H
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