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411 lines
11 KiB
C++
411 lines
11 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_PDU_H
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#define SRSLTE_PDU_H
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#include "srslte/common/interfaces_common.h"
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#include "srslte/common/log.h"
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#include <bitset>
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#include <stdint.h>
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#include <stdio.h>
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#include <vector>
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/* MAC PDU Packing/Unpacking functions. Section 6 of 36.321 */
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class subh;
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namespace srslte {
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template <class SubH>
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class pdu
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{
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public:
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pdu(uint32_t max_subheaders_, srslte::log* log_) :
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max_subheaders(max_subheaders_),
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subheaders(max_subheaders_),
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log(log_),
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nof_subheaders(0),
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cur_idx(-1),
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pdu_len(0),
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rem_len(0),
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last_sdu_idx(-1),
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pdu_is_ul(false),
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buffer_tx(nullptr)
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{
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}
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void fprint(FILE* stream)
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{
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fprintf(stream, "Number of Subheaders: %d\n", nof_subheaders);
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for (int i = 0; i < nof_subheaders; i++) {
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fprintf(stream, " -- Subheader %d: ", i);
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subheaders[i].fprint(stream);
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}
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}
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/* Resets the Read/Write position and remaining PDU length */
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void reset()
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{
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cur_idx = -1;
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last_sdu_idx = -1;
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rem_len = pdu_len;
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}
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void init_rx(uint32_t pdu_len_bytes, bool is_ulsch = false) { init_(NULL, pdu_len_bytes, is_ulsch); }
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void init_tx(byte_buffer_t* buffer, uint32_t pdu_len_bytes, bool is_ulsch = false)
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{
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init_(buffer, pdu_len_bytes, is_ulsch);
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}
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uint32_t nof_subh() { return nof_subheaders; }
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bool new_subh()
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{
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if (nof_subheaders < (int)max_subheaders - 1 && rem_len > 0 && buffer_tx->get_headroom() > 1) {
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nof_subheaders++;
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return next();
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} else {
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return false;
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}
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}
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bool next()
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{
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if (cur_idx < nof_subheaders - 1) {
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cur_idx++;
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return true;
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} else {
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return false;
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}
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}
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void del_subh()
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{
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if (nof_subheaders > 0) {
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nof_subheaders--;
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}
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if (cur_idx >= 0) {
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cur_idx--;
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}
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}
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SubH* get()
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{
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if (cur_idx >= 0) {
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return &subheaders[cur_idx];
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} else {
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return nullptr;
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}
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}
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bool is_ul() { return pdu_is_ul; }
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uint8_t* get_current_sdu_ptr() { return &buffer_tx->msg[buffer_tx->N_bytes]; }
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void add_sdu(uint32_t sdu_sz) { buffer_tx->N_bytes += sdu_sz; }
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// Section 6.1.2
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void parse_packet(uint8_t* ptr)
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{
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uint8_t* init_ptr = ptr;
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nof_subheaders = 0;
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bool ret = false;
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do {
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if (nof_subheaders < (int)max_subheaders) {
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ret = subheaders[nof_subheaders].read_subheader(&ptr);
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nof_subheaders++;
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}
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if (ret && ((ptr - init_ptr) >= (int32_t)pdu_len)) {
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// stop processing last subheader indicates another one but all bytes are consume
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nof_subheaders = 0;
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INFO("Corrupted MAC PDU - all bytes have been consumed (pdu_len=%d)\n", pdu_len);
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if (log) {
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log->info_hex(init_ptr, pdu_len, "Corrupted MAC PDU - all bytes have been consumed (pdu_len=%d)\n", pdu_len);
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}
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}
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} while (ret && (nof_subheaders + 1) < (int)max_subheaders && ((int32_t)pdu_len > (ptr - init_ptr)));
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for (int i = 0; i < nof_subheaders; i++) {
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subheaders[i].read_payload(&ptr);
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}
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}
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protected:
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std::vector<SubH> subheaders;
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uint32_t pdu_len;
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uint32_t rem_len;
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int cur_idx;
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int nof_subheaders;
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uint32_t max_subheaders;
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bool pdu_is_ul;
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byte_buffer_t* buffer_tx = nullptr;
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int last_sdu_idx;
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srslte::log* log = nullptr;
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/* Prepares the PDU for parsing or writing by setting the number of subheaders to 0 and the pdu length */
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virtual void init_(byte_buffer_t* buffer_tx_, uint32_t pdu_len_bytes, bool is_ulsch)
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{
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nof_subheaders = 0;
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pdu_len = pdu_len_bytes;
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rem_len = pdu_len;
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pdu_is_ul = is_ulsch;
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buffer_tx = buffer_tx_;
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last_sdu_idx = -1;
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reset();
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for (uint32_t i = 0; i < max_subheaders; i++) {
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subheaders[i].parent = this;
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subheaders[i].init();
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}
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}
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};
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typedef enum { SCH_SUBH_TYPE = 0, MCH_SUBH_TYPE = 1 } subh_type;
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template <class SubH>
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class subh
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{
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public:
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subh() {}
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virtual ~subh() {}
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virtual bool read_subheader(uint8_t** ptr) = 0;
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virtual void read_payload(uint8_t** ptr) = 0;
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virtual void write_subheader(uint8_t** ptr, bool is_last) = 0;
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virtual void write_payload(uint8_t** ptr) = 0;
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virtual void fprint(FILE* stream) = 0;
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pdu<SubH>* parent;
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private:
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virtual void init() = 0;
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};
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class sch_subh : public subh<sch_subh>
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{
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public:
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sch_subh(subh_type type_ = SCH_SUBH_TYPE) : type(type_) {}
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virtual ~sch_subh() {}
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/* 3GPP 36.321 (R.10) Combined Tables 6.2.1-1, 6.2.1-2, 6.2.1-4 */
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typedef enum {
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/* Values of LCID for DL-SCH */
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SCELL_ACTIVATION = 0b11011,
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CON_RES_ID = 0b11100,
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TA_CMD = 0b11101,
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DRX_CMD = 0b11110,
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/* Values of LCID for UL-SCH */
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PHR_REPORT_EXT = 0b11001,
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PHR_REPORT = 0b11010,
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CRNTI = 0b11011,
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TRUNC_BSR = 0b11100,
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SHORT_BSR = 0b11101,
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LONG_BSR = 0b11110,
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/* Values of LCID for MCH */
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MTCH_MAX_LCID = 0b11100,
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MCH_SCHED_INFO = 0b11110,
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/*MTCH STOP Value*/
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MTCH_STOP_EMPTY = 0b11111111111,
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/* Common */
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PADDING = 0b11111,
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SDU = 0b00000
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} cetype;
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// Size of MAC CEs
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const static int MAC_CE_CONTRES_LEN = 6;
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// Reading functions
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bool is_sdu();
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bool is_var_len_ce();
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cetype ce_type();
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uint32_t size_plus_header();
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void set_payload_size(uint32_t size);
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bool read_subheader(uint8_t** ptr);
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void read_payload(uint8_t** ptr);
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uint32_t get_sdu_lcid();
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uint32_t get_payload_size();
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uint32_t get_header_size(bool is_last);
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uint8_t* get_sdu_ptr();
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uint16_t get_c_rnti();
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uint64_t get_con_res_id();
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uint8_t get_ta_cmd();
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uint8_t get_activation_deactivation_cmd();
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float get_phr();
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int get_bsr(uint32_t buff_size[4]);
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bool get_next_mch_sched_info(uint8_t* lcid, uint16_t* mtch_stop);
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// Writing functions
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void write_subheader(uint8_t** ptr, bool is_last);
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void write_payload(uint8_t** ptr);
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int set_sdu(uint32_t lcid, uint32_t nof_bytes, uint8_t* payload);
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int set_sdu(uint32_t lcid, uint32_t requested_bytes, read_pdu_interface* sdu_itf);
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bool set_c_rnti(uint16_t crnti);
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bool set_bsr(uint32_t buff_size[4], sch_subh::cetype format);
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bool set_con_res_id(uint64_t con_res_id);
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bool set_ta_cmd(uint8_t ta_cmd);
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bool set_scell_activation_cmd(std::bitset<8> active_cc_idxs);
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bool set_phr(float phr);
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void set_padding();
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void set_padding(uint32_t padding_len);
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void set_type(subh_type type_);
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void init();
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void fprint(FILE* stream);
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bool set_next_mch_sched_info(uint8_t lcid, uint16_t mtch_stop);
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protected:
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static const int MAX_CE_PAYLOAD_LEN = 8;
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uint32_t lcid = 0;
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int nof_bytes = 0;
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uint8_t* payload = nullptr;
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uint8_t w_payload_ce[64] = {};
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uint8_t nof_mch_sched_ce = 0;
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uint8_t cur_mch_sched_ce = 0;
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bool F_bit = false;
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subh_type type = SCH_SUBH_TYPE;
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private:
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uint32_t sizeof_ce(uint32_t lcid, bool is_ul);
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static uint8_t buff_size_table(uint32_t buffer_size);
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static uint8_t phr_report_table(float phr_value);
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};
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class sch_pdu : public pdu<sch_subh>
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{
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public:
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sch_pdu(uint32_t max_subh, srslte::log* log) : pdu(max_subh, log) {}
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void parse_packet(uint8_t* ptr);
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uint8_t* write_packet();
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uint8_t* write_packet(srslte::log* log);
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bool has_space_ce(uint32_t nbytes, bool var_len = false);
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bool has_space_sdu(uint32_t nbytes);
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int get_pdu_len();
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int rem_size();
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int get_sdu_space();
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static uint32_t size_header_sdu(uint32_t nbytes);
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bool update_space_ce(uint32_t nbytes, bool var_len = false);
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bool update_space_sdu(uint32_t nbytes);
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void fprint(FILE* stream);
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};
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class rar_subh : public subh<rar_subh>
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{
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public:
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typedef enum { BACKOFF = 0, RAPID } rar_subh_type_t;
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rar_subh()
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{
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bzero(&grant, sizeof(grant));
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ta = 0;
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temp_rnti = 0;
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preamble = 0;
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parent = NULL;
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type = BACKOFF;
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}
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static const uint32_t RAR_GRANT_LEN = 20;
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// Reading functions
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bool read_subheader(uint8_t** ptr);
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void read_payload(uint8_t** ptr);
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bool has_rapid();
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uint32_t get_rapid();
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uint32_t get_ta_cmd();
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uint16_t get_temp_crnti();
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void get_sched_grant(uint8_t grant[RAR_GRANT_LEN]);
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// Writing functoins
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void write_subheader(uint8_t** ptr, bool is_last);
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void write_payload(uint8_t** ptr);
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void set_rapid(uint32_t rapid);
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void set_ta_cmd(uint32_t ta);
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void set_temp_crnti(uint16_t temp_rnti);
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void set_sched_grant(uint8_t grant[RAR_GRANT_LEN]);
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void init();
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void fprint(FILE* stream);
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private:
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uint8_t grant[RAR_GRANT_LEN];
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uint32_t ta;
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uint16_t temp_rnti;
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uint32_t preamble;
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rar_subh_type_t type;
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};
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class rar_pdu : public pdu<rar_subh>
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{
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public:
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rar_pdu(uint32_t max_rars = 16, srslte::log* log_ = nullptr);
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void set_backoff(uint8_t bi);
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bool has_backoff();
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uint8_t get_backoff();
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bool write_packet(uint8_t* ptr);
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void fprint(FILE* stream);
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private:
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bool has_backoff_indicator;
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uint8_t backoff_indicator;
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};
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class mch_pdu : public sch_pdu
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{
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public:
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mch_pdu(uint32_t max_subh, srslte::log* log) : sch_pdu(max_subh, log) {}
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private:
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/* Prepares the PDU for parsing or writing by setting the number of subheaders to 0 and the pdu length */
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virtual void init_(byte_buffer_t* buffer_tx_, uint32_t pdu_len_bytes, bool is_ulsch)
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{
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nof_subheaders = 0;
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pdu_len = pdu_len_bytes;
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rem_len = pdu_len;
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pdu_is_ul = is_ulsch;
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buffer_tx = buffer_tx_;
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last_sdu_idx = -1;
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reset();
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for (uint32_t i = 0; i < max_subheaders; i++) {
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subheaders[i].set_type(MCH_SUBH_TYPE);
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subheaders[i].parent = this;
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subheaders[i].init();
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}
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}
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};
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} // namespace srslte
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#endif // MACPDU_H
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