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203 lines
9.3 KiB
C
203 lines
9.3 KiB
C
6 years ago
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/*
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* \section LICENSE
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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_S1AP_COMMON_H
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#define SRSEPC_S1AP_COMMON_H
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#include "srslte/common/security.h"
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#include "srslte/asn1/gtpc_ies.h"
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#include "srslte/asn1/liblte_s1ap.h"
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#include "srslte/asn1/liblte_mme.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",
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"COMMON PROCEDURE INITIATED",
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"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",
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"CONNECTED"};
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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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* EMM, ECM, ESM and EPS Security context definition
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*/
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typedef struct{
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uint64_t imsi;
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LIBLTE_MME_EPS_MOBILE_ID_GUTI_STRUCT guti;
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eps_sec_ctx_t security_ctxt;
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uint8_t procedure_transaction_id;
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emm_state_t state;
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uint32_t mme_ue_s1ap_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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uint64_t imsi;
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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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ecm_state_t state;
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bool eit;
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} ecm_ctx_t;
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typedef struct{
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enum erab_state state;
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uint8_t erab_id;
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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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} erab_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 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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} sec_ctx_t;
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class nas
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{
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public:
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/*Initial UE messages*/
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bool handle_nas_attach_request( uint32_t enb_ue_s1ap_id,
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srslte::byte_buffer_t *nas_msg,
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srslte::byte_buffer_t *reply_buffer,
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bool* reply_flag,
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struct sctp_sndrcvinfo *enb_sri);
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bool handle_nas_imsi_attach_request( uint32_t enb_ue_s1ap_id,
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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 *reply_buffer,
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bool* reply_flag,
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struct sctp_sndrcvinfo *enb_sri);
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bool handle_nas_guti_attach_request( uint32_t enb_ue_s1ap_id,
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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_msg,
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srslte::byte_buffer_t *reply_buffer,
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bool* reply_flag,
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struct sctp_sndrcvinfo *enb_sri);
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bool handle_nas_service_request( uint32_t m_tmsi,
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uint32_t enb_ue_s1ap_id,
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srslte::byte_buffer_t *nas_msg,
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srslte::byte_buffer_t *reply_buffer,
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bool* reply_flag,
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struct sctp_sndrcvinfo *enb_sri);
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bool handle_nas_detach_request( uint32_t m_tmsi,
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uint32_t enb_ue_s1ap_id,
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srslte::byte_buffer_t *nas_msg,
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srslte::byte_buffer_t *reply_buffer,
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bool* reply_flag,
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struct sctp_sndrcvinfo *enb_sri);
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bool handle_nas_tracking_area_update_request( uint32_t m_tmsi,
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uint32_t enb_ue_s1ap_id,
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srslte::byte_buffer_t *nas_msg,
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srslte::byte_buffer_t *reply_buffer,
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bool* reply_flag,
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struct sctp_sndrcvinfo *enb_sri);
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/* Uplink NAS messages handling */
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bool handle_nas_authentication_response( srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool* reply_flag);
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bool handle_nas_security_mode_complete( srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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bool handle_nas_attach_complete( srslte::byte_buffer_t *nas_msg, ue_ctx_t *ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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bool handle_esm_information_response( srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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bool handle_identity_response( srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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bool handle_tracking_area_update_request( srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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bool handle_authentication_failure( srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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bool handle_nas_detach_request( srslte::byte_buffer_t *nas_msg, ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_buffer, bool *reply_flag);
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/* Downlink NAS messages packing*/
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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 eksi, uint8_t *autn, uint8_t *rand);
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bool pack_authentication_reject( srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id);
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bool pack_security_mode_command( srslte::byte_buffer_t *reply_msg, ue_emm_ctx_t *ue_emm_ctx, ue_ecm_ctx_t *ue_ecm_ctx);
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bool pack_esm_information_request( srslte::byte_buffer_t *reply_msg, ue_emm_ctx_t *ue_emm_ctx, ue_ecm_ctx_t *ue_ecm_ctx);
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bool pack_identity_request( srslte::byte_buffer_t *reply_msg, uint32_t enb_ue_s1ap_id, uint32_t mme_ue_s1ap_id);
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bool pack_emm_information( ue_ctx_t* ue_ctx, srslte::byte_buffer_t *reply_msg);
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bool pack_service_reject( srslte::byte_buffer_t *reply_msg, uint8_t emm_cause, uint32_t enb_ue_s1ap_id);
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bool pack_attach_accept( ue_emm_ctx_t *ue_emm_ctx, ue_ecm_ctx_t *ue_ecm_ctx, LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctxt, struct srslte::gtpc_pdn_address_allocation_ie *paa, srslte::byte_buffer_t *nas_buffer);
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/* Security functions */
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bool integrity_check( ue_emm_ctx_t *emm_ctx, srslte::byte_buffer_t *pdu);
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bool short_integrity_check( ue_emm_ctx_t *emm_ctx, srslte::byte_buffer_t *pdu);
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private:
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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 sec_ctx;
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};
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}//namespace
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#endif // SRSEPC_S1AP_COMMON_H
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