Bastian Bloessl
127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013 Bastian Bloessl <bloessl@ccs-labs.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_IEEE802_11_UTILS_H
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#define INCLUDED_IEEE802_11_UTILS_H
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#include <gnuradio/config.h>
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#include <ieee802_11/api.h>
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#include <ieee802_11/mapper.h>
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#include <cinttypes>
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#include <iostream>
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using gr::ieee802_11::Encoding;
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#define MAX_PAYLOAD_SIZE 1500
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#define MAX_PSDU_SIZE (MAX_PAYLOAD_SIZE + 28) // MAC, CRC
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#define MAX_SYM (((16 + 8 * MAX_PSDU_SIZE + 6) / 24) + 1)
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#define MAX_ENCODED_BITS ((16 + 8 * MAX_PSDU_SIZE + 6) * 2 + 288)
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#define dout d_debug&& std::cout
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#define mylog(msg) \
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do { \
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if (d_log) { \
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GR_LOG_INFO(d_logger, msg); \
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} \
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} while (0);
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struct mac_header {
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// protocol version, type, subtype, to_ds, from_ds, ...
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uint16_t frame_control;
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uint16_t duration;
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uint8_t addr1[6];
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uint8_t addr2[6];
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uint8_t addr3[6];
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uint16_t seq_nr;
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} __attribute__((packed));
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/**
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* WIFI parameters
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*/
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class ofdm_param
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{
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public:
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ofdm_param(Encoding e);
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// data rate
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Encoding encoding;
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// rate field of the SIGNAL header
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char rate_field;
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// number of coded bits per sub carrier
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int n_bpsc;
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// number of coded bits per OFDM symbol
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int n_cbps;
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// number of data bits per OFDM symbol
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int n_dbps;
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void print();
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};
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/**
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* packet specific parameters
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*/
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class frame_param
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{
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public:
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frame_param(ofdm_param& ofdm, int psdu_length);
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// PSDU size in bytes
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int psdu_size;
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// number of OFDM symbols (17-11)
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int n_sym;
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// number of padding bits in the DATA field (17-13)
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int n_pad;
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int n_encoded_bits;
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// number of data bits, including service and padding (17-12)
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int n_data_bits;
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void print();
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};
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/**
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* Given a payload, generates a MAC data frame (i.e., a PSDU) to be given
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* to the physical layer for encoding.
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*
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* \param msdu the payload for the MAC frame
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* \param msdu_size the size of the msdu in bytes
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* \param psdu pointer to a byte array where to store the MAC frame. Memory
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* will be alloced by the function
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* \param psdu_size pointer to an integer where the size of the psdu in bytes
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* will be stored
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* \param seq sequence number of the frame
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*/
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void generate_mac_data_frame(
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const char* msdu, int msdu_size, char** psdu, int* psdu_size, char seq);
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void scramble(const char* input, char* out, frame_param& frame, char initial_state);
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void reset_tail_bits(char* scrambled_data, frame_param& frame);
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void convolutional_encoding(const char* input, char* out, frame_param& frame);
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void puncturing(const char* input, char* out, frame_param& frame, ofdm_param& ofdm);
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void interleave(const char* input,
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char* out,
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frame_param& frame,
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ofdm_param& ofdm,
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bool reverse = false);
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void split_symbols(const char* input, char* out, frame_param& frame, ofdm_param& ofdm);
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void generate_bits(const char* psdu, char* data_bits, frame_param& frame);
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#endif /* INCLUDED_IEEE802_11_UTILS_H */
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