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Bastian Bloessl
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/*
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* Copyright (C) 2013, 2016 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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#include <ieee802-11/mac.h>
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#include <gnuradio/io_signature.h>
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#include <gnuradio/block_detail.h>
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#include "utils.h"
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#if defined(__APPLE__)
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#include <architecture/byte_order.h>
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#define htole16(x) OSSwapHostToLittleInt16(x)
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#else
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#include <endian.h>
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#endif
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#include <boost/crc.hpp>
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#include <iostream>
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#include <stdexcept>
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using namespace gr::ieee802_11;
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class mac_impl : public mac {
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public:
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mac_impl(std::vector<uint8_t> src_mac, std::vector<uint8_t> dst_mac, std::vector<uint8_t> bss_mac) :
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block("mac",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0)),
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d_seq_nr(0) {
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message_port_register_out(pmt::mp("phy out"));
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message_port_register_out(pmt::mp("app out"));
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message_port_register_in(pmt::mp("app in"));
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set_msg_handler(pmt::mp("app in"), boost::bind(&mac_impl::app_in, this, _1));
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message_port_register_in(pmt::mp("phy in"));
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set_msg_handler(pmt::mp("phy in"), boost::bind(&mac_impl::phy_in, this, _1));
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if(!check_mac(src_mac)) throw std::invalid_argument("wrong mac address size");
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if(!check_mac(dst_mac)) throw std::invalid_argument("wrong mac address size");
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if(!check_mac(bss_mac)) throw std::invalid_argument("wrong mac address size");
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for(int i = 0; i < 6; i++) {
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d_src_mac[i] = src_mac[i];
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d_dst_mac[i] = dst_mac[i];
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d_bss_mac[i] = bss_mac[i];
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}
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}
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void phy_in (pmt::pmt_t msg) {
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// this must be a pair
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if (!pmt::is_blob(pmt::cdr(msg)))
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throw std::runtime_error("PMT must be blob");
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// strip MAC header
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// TODO: check for frame type to determine header size
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pmt::pmt_t blob(pmt::cdr(msg));
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const char *mpdu = reinterpret_cast<const char *>(pmt::blob_data(blob));
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std::cout << "pdu len " << pmt::blob_length(blob) << std::endl;
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pmt::pmt_t msdu = pmt::make_blob(mpdu + 24, pmt::blob_length(blob) - 24);
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message_port_pub(pmt::mp("app out"), pmt::cons(pmt::car(msg), msdu));
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}
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void app_in (pmt::pmt_t msg) {
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size_t msg_len;
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const char *msdu;
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std::string str;
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if(pmt::is_eof_object(msg)) {
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message_port_pub(pmt::mp("phy out"), pmt::PMT_EOF);
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detail().get()->set_done(true);
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return;
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} else if(pmt::is_symbol(msg)) {
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str = pmt::symbol_to_string(msg);
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msg_len = str.length();
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msdu = str.data();
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} else if(pmt::is_pair(msg)) {
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msg_len = pmt::blob_length(pmt::cdr(msg));
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msdu = reinterpret_cast<const char *>(pmt::blob_data(pmt::cdr(msg)));
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} else {
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throw std::invalid_argument("MAC expects PDUs or strings");
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return;
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}
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if(msg_len > 1500) {
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throw std::invalid_argument("Frame too large (> 1500)");
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}
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// make MAC frame
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int psdu_length;
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generate_mac_data_frame(msdu, msg_len, &psdu_length);
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// dict
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pmt::pmt_t dict = pmt::make_dict();
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dict = pmt::dict_add(dict, pmt::mp("crc_included"), pmt::PMT_T);
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// blob
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pmt::pmt_t mac = pmt::make_blob(d_psdu, psdu_length);
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// pdu
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message_port_pub(pmt::mp("phy out"), pmt::cons(dict, mac));
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}
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void generate_mac_data_frame(const char *msdu, int msdu_size, int *psdu_size) {
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// mac header
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mac_header header;
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header.frame_control = 0x0008;
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header.duration = 0x0000;
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for(int i = 0; i < 6; i++) {
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header.addr1[i] = d_dst_mac[i];
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header.addr2[i] = d_src_mac[i];
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header.addr3[i] = d_bss_mac[i];
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}
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header.seq_nr = 0;
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for (int i = 0; i < 12; i++) {
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if(d_seq_nr & (1 << i)) {
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header.seq_nr |= (1 << (i + 4));
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}
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}
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header.seq_nr = htole16(header.seq_nr);
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d_seq_nr++;
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//header size is 24, plus 4 for FCS means 28 bytes
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*psdu_size = 28 + msdu_size;
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//copy mac header into psdu
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std::memcpy(d_psdu, &header, 24);
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//copy msdu into psdu
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memcpy(d_psdu + 24, msdu, msdu_size);
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//compute and store fcs
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boost::crc_32_type result;
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result.process_bytes(d_psdu, msdu_size + 24);
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uint32_t fcs = result.checksum();
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memcpy(d_psdu + msdu_size + 24, &fcs, sizeof(uint32_t));
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}
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bool check_mac(std::vector<uint8_t> mac) {
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if(mac.size() != 6) return false;
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return true;
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}
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private:
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uint16_t d_seq_nr;
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uint8_t d_src_mac[6];
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uint8_t d_dst_mac[6];
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uint8_t d_bss_mac[6];
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uint8_t d_psdu[1528];
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};
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mac::sptr
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mac::make(std::vector<uint8_t> src_mac, std::vector<uint8_t> dst_mac, std::vector<uint8_t> bss_mac) {
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return gnuradio::get_initial_sptr(new mac_impl(src_mac, dst_mac, bss_mac));
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}
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