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195 lines
6.7 KiB
C++
195 lines
6.7 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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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/adt/accumulators.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/interfaces_common.h"
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#include "srslte/common/security.h"
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#include "srslte/common/task_scheduler.h"
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#include "srslte/common/threads.h"
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#include "srslte/common/timers.h"
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#include "srslte/interfaces/pdcp_interface_types.h"
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#include "srslte/upper/byte_buffer_queue.h"
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#include "srslte/upper/pdcp_metrics.h"
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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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// Maximum supported PDCP SDU size is 9000 bytes.
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// See TS 38.323 v15.2.0, section 4.3.1
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#define PDCP_MAX_SDU_SIZE 9000
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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(task_sched_handle task_sched_, srslog::basic_logger& logger);
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pdcp_entity_base(pdcp_entity_base&&) = default;
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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(srslte_direction_t direction = DIRECTION_TXRX)
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{
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// if either DL or UL is already enabled, both are enabled
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if (integrity_direction == DIRECTION_TX && direction == DIRECTION_RX) {
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integrity_direction = DIRECTION_TXRX;
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} else if (integrity_direction == DIRECTION_RX && direction == DIRECTION_TX) {
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integrity_direction = DIRECTION_TXRX;
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} else {
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integrity_direction = direction;
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}
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logger.debug("LCID=%d, integrity=%s", lcid, srslte_direction_text[integrity_direction]);
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}
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void enable_encryption(srslte_direction_t direction = DIRECTION_TXRX)
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{
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// if either DL or UL is already enabled, both are enabled
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if (encryption_direction == DIRECTION_TX && direction == DIRECTION_RX) {
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encryption_direction = DIRECTION_TXRX;
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} else if (encryption_direction == DIRECTION_RX && direction == DIRECTION_TX) {
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encryption_direction = DIRECTION_TXRX;
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} else {
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encryption_direction = direction;
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}
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logger.debug("LCID=%d encryption=%s", lcid, srslte_direction_text[integrity_direction]);
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}
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void enable_security_timed(srslte_direction_t direction, uint32_t sn)
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{
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switch (direction) {
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case DIRECTION_TX:
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enable_security_tx_sn = sn;
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break;
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case DIRECTION_RX:
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enable_security_rx_sn = sn;
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break;
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default:
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logger.error("Timed security activation for direction %s not supported.", srslte_direction_text[direction]);
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break;
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}
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}
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void config_security(as_security_config_t sec_cfg_);
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// GW/SDAP/RRC interface
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virtual void write_sdu(unique_byte_buffer_t sdu, int sn = -1) = 0;
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// RLC interface
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virtual void write_pdu(unique_byte_buffer_t pdu) = 0;
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virtual void notify_delivery(const pdcp_sn_vector_t& pdcp_sns) = 0;
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virtual void notify_failure(const pdcp_sn_vector_t& pdcp_sns) = 0;
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virtual void get_bearer_state(pdcp_lte_state_t* state) = 0;
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virtual void set_bearer_state(const pdcp_lte_state_t& state, bool set_fmc) = 0;
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virtual std::map<uint32_t, srslte::unique_byte_buffer_t> get_buffered_pdus() = 0;
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virtual void send_status_report() = 0;
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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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// Metrics helpers
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virtual pdcp_bearer_metrics_t get_metrics() = 0;
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virtual void reset_metrics() = 0;
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protected:
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srslog::basic_logger& logger;
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srslte::task_sched_handle task_sched;
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bool active = false;
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uint32_t lcid = 0;
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srslte_direction_t integrity_direction = DIRECTION_NONE;
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srslte_direction_t encryption_direction = DIRECTION_NONE;
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int32_t enable_security_tx_sn = -1; // TX SN at which security will be enabled
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int32_t enable_security_rx_sn = -1; // RX SN at which security will be enabled
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pdcp_config_t cfg = {1,
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PDCP_RB_IS_DRB,
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SECURITY_DIRECTION_DOWNLINK,
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SECURITY_DIRECTION_UPLINK,
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PDCP_SN_LEN_12,
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pdcp_t_reordering_t::ms500,
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pdcp_discard_timer_t::infinity,
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false};
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srslte::as_security_config_t sec_cfg = {};
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// Security functions
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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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// Common packing functions
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bool is_control_pdu(const unique_byte_buffer_t& pdu);
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pdcp_pdu_type_t get_control_pdu_type(const unique_byte_buffer_t& pdu);
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uint32_t read_data_header(const unique_byte_buffer_t& pdu);
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void discard_data_header(const unique_byte_buffer_t& pdu);
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void write_data_header(const srslte::unique_byte_buffer_t& sdu, uint32_t count);
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void extract_mac(const unique_byte_buffer_t& pdu, uint8_t* mac);
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void append_mac(const unique_byte_buffer_t& sdu, uint8_t* mac);
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// Metrics helpers
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pdcp_bearer_metrics_t metrics = {};
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srslte::rolling_average<double> tx_pdu_ack_latency_ms;
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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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