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131 lines
4.2 KiB
C++
131 lines
4.2 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 SRSLTE_PDCP_ENTITY_BASE_H
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#define SRSLTE_PDCP_ENTITY_BASE_H
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#include "srslte/common/buffer_pool.h"
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#include "srslte/common/common.h"
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#include "srslte/common/log.h"
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#include "srslte/common/security.h"
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#include "srslte/common/threads.h"
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#include "srslte/interfaces/ue_interfaces.h"
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#include <mutex>
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namespace srslte {
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/****************************************************************************
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* Structs and Defines common to both LTE and NR
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* Ref: 3GPP TS 36.323 v10.1.0 and TS 38.323 v15.2.0
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***************************************************************************/
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#define PDCP_PDU_TYPE_PDCP_STATUS_REPORT 0x0
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#define PDCP_PDU_TYPE_INTERSPERSED_ROHC_FEEDBACK_PACKET 0x1
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typedef enum {
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PDCP_D_C_CONTROL_PDU = 0,
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PDCP_D_C_DATA_PDU,
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PDCP_D_C_N_ITEMS,
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} pdcp_d_c_t;
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static const char pdcp_d_c_text[PDCP_D_C_N_ITEMS][20] = {"Control PDU", "Data PDU"};
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/****************************************************************************
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* PDCP Entity interface
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* Common interface for LTE and NR PDCP entities
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***************************************************************************/
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class pdcp_entity_base
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{
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public:
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pdcp_entity_base();
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virtual ~pdcp_entity_base();
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virtual void reset() = 0;
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virtual void reestablish() = 0;
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bool is_active() { return active; }
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bool is_srb() { return cfg.rb_type == PDCP_RB_IS_SRB; }
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bool is_drb() { return cfg.rb_type == PDCP_RB_IS_DRB; }
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// RRC interface
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void enable_integrity() { do_integrity = true; }
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void enable_encryption() { do_encryption = true; }
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void config_security(uint8_t* k_rrc_enc_,
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uint8_t* k_rrc_int_,
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uint8_t* k_up_enc_,
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uint8_t* k_up_int_, // NR Only, pass nullptr in LTE
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CIPHERING_ALGORITHM_ID_ENUM cipher_algo_,
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INTEGRITY_ALGORITHM_ID_ENUM integ_algo_);
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// GW/SDAP/RRC interface
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void write_sdu(unique_byte_buffer_t sdu, bool blocking);
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// RLC interface
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void write_pdu(unique_byte_buffer_t pdu);
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// COUNT, HFN and SN helpers
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uint32_t HFN(uint32_t count);
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uint32_t SN(uint32_t count);
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uint32_t COUNT(uint32_t hfn, uint32_t sn);
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protected:
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srslte::log* log = nullptr;
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bool active = false;
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uint32_t lcid = 0;
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bool do_integrity = false;
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bool do_encryption = false;
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srslte_pdcp_config_t cfg = {
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1, PDCP_RB_IS_DRB, SECURITY_DIRECTION_DOWNLINK, SECURITY_DIRECTION_UPLINK, PDCP_SN_LEN_12};
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std::mutex mutex;
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uint8_t k_rrc_enc[32] = {};
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uint8_t k_rrc_int[32] = {};
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uint8_t k_up_enc[32] = {};
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uint8_t k_up_int[32] = {};
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CIPHERING_ALGORITHM_ID_ENUM cipher_algo = CIPHERING_ALGORITHM_ID_EEA0;
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INTEGRITY_ALGORITHM_ID_ENUM integ_algo = INTEGRITY_ALGORITHM_ID_EIA0;
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void integrity_generate(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* mac);
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bool integrity_verify(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* mac);
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void cipher_encrypt(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* ct);
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void cipher_decrypt(uint8_t* ct, uint32_t ct_len, uint32_t count, uint8_t* msg);
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};
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inline uint32_t pdcp_entity_base::HFN(uint32_t count)
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{
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return (count >> cfg.sn_len);
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}
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inline uint32_t pdcp_entity_base::SN(uint32_t count)
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{
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return count & (0xFFFFFFFF >> (32 -cfg.sn_len));
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}
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inline uint32_t pdcp_entity_base::COUNT(uint32_t hfn, uint32_t sn)
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{
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return (hfn << cfg.sn_len) | sn;
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}
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} // namespace srslte
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#endif // SRSLTE_PDCP_ENTITY_BASE_H
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