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147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsUE library.
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*
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* srsUE 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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* srsUE 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 NAS_H
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#define NAS_H
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#include "common/buffer_pool.h"
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#include "common/log.h"
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#include "common/common.h"
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#include "common/interfaces.h"
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#include "common/security.h"
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#include "asn1/liblte_mme.h"
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using srslte::byte_buffer_t;
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namespace srsue {
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// EMM states (3GPP 24.302 v10.0.0)
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typedef enum{
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EMM_STATE_NULL = 0,
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EMM_STATE_DEREGISTERED,
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EMM_STATE_REGISTERED_INITIATED,
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EMM_STATE_REGISTERED,
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EMM_STATE_SERVICE_REQUEST_INITIATED,
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EMM_STATE_DEREGISTERED_INITIATED,
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EMM_STATE_TAU_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] = {"NULL",
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"DEREGISTERED",
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"REGISTERED INITIATED",
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"REGISTERED",
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"SERVICE REQUEST INITIATED",
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"DEREGISTERED INITIATED",
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"TRACKING AREA UPDATE INITIATED"};
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class nas
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:public nas_interface_rrc
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{
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public:
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nas();
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void init(usim_interface_nas *usim_,
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rrc_interface_nas *rrc_,
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gw_interface_nas *gw_,
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srslte::log *nas_log_);
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void stop();
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emm_state_t get_state();
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// RRC interface
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void notify_connection_setup();
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void write_pdu(uint32_t lcid, byte_buffer_t *pdu);
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uint32_t get_ul_count();
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bool is_attached();
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bool get_s_tmsi(LIBLTE_RRC_S_TMSI_STRUCT *s_tmsi);
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private:
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srslte::byte_buffer_pool *pool;
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srslte::log *nas_log;
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rrc_interface_nas *rrc;
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usim_interface_nas *usim;
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gw_interface_nas *gw;
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emm_state_t state;
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// Save short MAC
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// Identifiers
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LIBLTE_MME_EPS_MOBILE_ID_GUTI_STRUCT guti;
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bool is_guti_set;
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uint32_t ip_addr;
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uint8_t eps_bearer_id;
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uint8_t transaction_id;
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// NAS counters - incremented for each security-protected message recvd/sent
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uint32_t count_ul;
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uint32_t count_dl;
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// Security
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uint8_t ksi;
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uint8_t k_nas_enc[32];
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uint8_t k_nas_int[32];
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CIPHERING_ALGORITHM_ID_ENUM cipher_algo;
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INTEGRITY_ALGORITHM_ID_ENUM integ_algo;
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void integrity_generate(uint8_t *key_128,
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uint32_t count,
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uint8_t rb_id,
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uint8_t direction,
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uint8_t *msg,
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uint32_t msg_len,
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uint8_t *mac);
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void integrity_check();
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void cipher_encrypt();
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void cipher_decrypt();
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// Parsers
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void parse_attach_accept(uint32_t lcid, byte_buffer_t *pdu);
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void parse_attach_reject(uint32_t lcid, byte_buffer_t *pdu);
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void parse_authentication_request(uint32_t lcid, byte_buffer_t *pdu);
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void parse_authentication_reject(uint32_t lcid, byte_buffer_t *pdu);
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void parse_identity_request(uint32_t lcid, byte_buffer_t *pdu);
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void parse_security_mode_command(uint32_t lcid, byte_buffer_t *pdu);
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void parse_service_reject(uint32_t lcid, byte_buffer_t *pdu);
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void parse_esm_information_request(uint32_t lcid, byte_buffer_t *pdu);
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void parse_emm_information(uint32_t lcid, byte_buffer_t *pdu);
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// Senders
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void send_attach_request();
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void send_identity_response();
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void send_service_request();
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void send_esm_information_response();
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void gen_pdn_connectivity_request(LIBLTE_BYTE_MSG_STRUCT *msg);
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};
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} // namespace srsue
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#endif // NAS_H
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