| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author (C) 2015 by Roman Khassraf <rkhassraf@gmail.com> |
| * @section LICENSE |
| * |
| * Gr-gsm is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 3, or (at your option) |
| * any later version. |
| * |
| * Gr-gsm is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with gr-gsm; see the file COPYING. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <gnuradio/io_signature.h> |
| #include <grgsm/gsmtap.h> |
| //#include <unistd.h> |
| #include <map> |
| #include <grgsm/endian.h> |
| #include <boost/foreach.hpp> |
| |
| #include "extract_immediate_assignment_impl.h" |
| |
| namespace gr { |
| namespace gsm { |
| boost::mutex extract_immediate_assignment_mutex; |
| |
| void extract_immediate_assignment_impl::process_message(pmt::pmt_t msg){ |
| pmt::pmt_t message_plus_header_blob = pmt::cdr(msg); |
| uint8_t * message_plus_header = (uint8_t *)pmt::blob_data(message_plus_header_blob); |
| gsmtap_hdr * header = (gsmtap_hdr *)message_plus_header; |
| uint8_t * msg_elements = (uint8_t *)(message_plus_header+sizeof(gsmtap_hdr)); |
| uint32_t frame_nr = be32toh(header->frame_number); |
| |
| if(msg_elements[2]==0x3f) |
| { |
| immediate_assignment current; |
| current.frame_nr = frame_nr; |
| |
| /* |
| channel description, see table 10.23 in GSM 04.08 |
| |
| msg_elements[4], octet 2 in specs |
| |
| 5 bits channel type |
| ignored in TBF |
| 00001 TCH/F |
| 0001T TCH/H, subchannel/TDMA offset T |
| 001TT SDCCH/4, subchannel/TDMA offset TT |
| 01TTT SDCCH/8, subchannel/TDMA offset TTT |
| 3 bits timeslot number TN |
| */ |
| current.timeslot = (msg_elements[4] & 7); |
| |
| uint8_t channeltype = (msg_elements[4] >> 3); |
| uint8_t mode = msg_elements[3] & (1 << 4); |
| if (mode == 0) |
| { |
| if (channeltype >= 8) |
| { |
| current.channel_type = "SDCCH/8"; |
| current.subchannel = (channeltype & 7); |
| } |
| else if (channeltype >= 4 && channeltype <= 7) |
| { |
| current.channel_type = "SDCCH/4"; |
| current.subchannel = (channeltype & 3); |
| } |
| else if (channeltype >= 2 && channeltype <= 3) |
| { |
| current.channel_type = "TCH/H"; |
| current.subchannel = (channeltype & 1); |
| } |
| else |
| { |
| current.channel_type = "TCH/F"; |
| } |
| } |
| else |
| { |
| // We return if ignore_gprs is set true |
| if (d_ignore_gprs) |
| { |
| return; |
| } |
| current.channel_type = "GPRS - Temporary Block Flow TBF"; |
| } |
| |
| /* |
| msg_elements[5], msg_elements[6] are octets 3 and 4 in specs |
| |
| 3 bits training sequence (we dont process this for the moment) |
| 1 bit hopping channel H |
| |
| if H = 0: |
| 2 bit spare |
| 2 bit high part of single channel arfcn |
| |
| 8 bit low part of single channel arfcn |
| |
| if H = 1: |
| 4 bit high part of MAIO |
| |
| 2 bit low part of MAIO |
| 6bit HSN |
| */ |
| current.hopping = (msg_elements[5] >> 4) & 1; |
| if (current.hopping) |
| { |
| uint8_t maio = (msg_elements[5] & 0xf) << 2; |
| maio |= (msg_elements[6] >> 6); |
| current.maio = maio; |
| current.hsn = (msg_elements[6] & 0x3f); |
| } |
| else |
| { |
| uint16_t arfcn = (msg_elements[5] & 3) << 8; |
| arfcn |= msg_elements[6]; |
| current.arfcn = arfcn; |
| } |
| |
| /* |
| msg_elements[7 - 9], octets 5 - 7 in specs, see 10.5.2.30 request reference, maybe later |
| */ |
| uint8_t random_access_info = msg_elements[7]; |
| uint8_t rr_t1 = (msg_elements[8] >> 3); |
| uint8_t rr_t2 = (msg_elements[9] & 0x1F); |
| uint8_t rr_t3 = (msg_elements[8] & 0x7) << 3; |
| rr_t3 |= (msg_elements[9] >> 5); |
| uint32_t request_fnr = 51*((rr_t3-rr_t2) % 26) + rr_t3 + (51*26*rr_t1); |
| |
| // we will use random_access_info and request_fnr together as request_reference in the map, |
| // if unique_references is set true |
| uint32_t request_ref = (random_access_info << 0x16); |
| request_ref |= request_fnr; |
| |
| /* |
| msg_elements[10]: timing advance |
| */ |
| current.timing_advance = msg_elements[10]; |
| |
| /* |
| msg_elements[11 - 20]: mobile allocation, flexible length, see 10.5.2.21 |
| */ |
| uint8_t mobile_allocation_len = msg_elements[11]; |
| if (mobile_allocation_len > 0) |
| { |
| std::string ma; |
| for (int i=0; i<mobile_allocation_len; i++) |
| { |
| for (int j=0; j<8; j++) |
| { |
| ma.push_back('0' + ((msg_elements[12 + i] >> (7-j)) & 0x1)); |
| } |
| } |
| current.mobile_allocation = ma; |
| } |
| |
| bool is_duplicate = false; |
| if (d_unique_references) |
| { |
| if (d_assignment_map.find(request_ref) != d_assignment_map.end()) |
| { |
| is_duplicate = true; |
| } |
| else |
| { |
| d_assignment_map[request_ref] = current; |
| } |
| } |
| else |
| { |
| d_assignment_map[current.frame_nr] = current; |
| } |
| |
| if (d_print_immediate_assignments && !is_duplicate) |
| { |
| std::cout << "\n------------------------------------------------\n" << std::endl; |
| std::cout << "FrameNr: " << (unsigned)current.frame_nr << std::endl; |
| std::cout << "Channel type: " << current.channel_type << std::endl; |
| std::cout << "Timeslot: " << (unsigned)current.timeslot << std::endl; |
| // Dont print subchannel if mode == 1 or if the assigned channel is TCH/F |
| if (mode == 0 && channeltype >= 2) |
| { |
| std::cout << "Subchannel: " << (unsigned)current.subchannel << std::endl; |
| } |
| std::cout << "Hopping: " << (unsigned)current.hopping << std::endl; |
| if (current.hopping) |
| { |
| std::cout << "MAIO: " << (unsigned)current.maio << std::endl; |
| std::cout << "HSN: " << (unsigned)current.hsn << std::endl; |
| std::cout << "Mobile Allocation: " << current.mobile_allocation << std::endl; |
| } |
| else |
| { |
| std::cout << "ARFCN: " << (unsigned)current.arfcn << std::endl; |
| } |
| std::cout << "Timing Advance: " << (unsigned)current.timing_advance << std::endl; |
| } |
| } |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_frame_numbers() |
| { |
| std::vector<int> fnrs; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| fnrs.push_back(i.second.frame_nr); |
| } |
| return fnrs; |
| } |
| |
| std::vector<std::string> extract_immediate_assignment_impl::get_channel_types() |
| { |
| std::vector<std::string> types; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| types.push_back(i.second.channel_type); |
| } |
| return types; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_timeslots() |
| { |
| std::vector<int> timeslots; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| timeslots.push_back(i.second.timeslot); |
| } |
| return timeslots; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_subchannels() |
| { |
| std::vector<int> subchannels; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| subchannels.push_back(i.second.subchannel); |
| } |
| return subchannels; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_hopping() |
| { |
| std::vector<int> hopping; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| hopping.push_back(i.second.hopping); |
| } |
| return hopping; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_maios() |
| { |
| std::vector<int> maios; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| maios.push_back(i.second.maio); |
| } |
| return maios; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_hsns() |
| { |
| std::vector<int> hsns; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| hsns.push_back(i.second.hsn); |
| } |
| return hsns; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_arfcns() |
| { |
| std::vector<int> arfcns; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| arfcns.push_back(i.second.arfcn); |
| } |
| return arfcns; |
| } |
| |
| std::vector<int> extract_immediate_assignment_impl::get_timing_advances() |
| { |
| std::vector<int> tas; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| tas.push_back(i.second.timing_advance); |
| } |
| return tas; |
| } |
| |
| std::vector<std::string> extract_immediate_assignment_impl::get_mobile_allocations() |
| { |
| std::vector<std::string> mobile_allocations; |
| BOOST_FOREACH(immediate_assignment_map::value_type &i, d_assignment_map) |
| { |
| mobile_allocations.push_back(i.second.mobile_allocation); |
| } |
| return mobile_allocations; |
| } |
| |
| extract_immediate_assignment::sptr |
| extract_immediate_assignment::make(bool print_immediate_assignments, bool ignore_gprs, bool unique_references) |
| { |
| return gnuradio::get_initial_sptr |
| (new extract_immediate_assignment_impl(print_immediate_assignments, ignore_gprs, unique_references)); |
| } |
| |
| /* |
| * The private constructor |
| */ |
| extract_immediate_assignment_impl::extract_immediate_assignment_impl(bool print_immediate_assignments, |
| bool ignore_gprs, bool unique_references) |
| : gr::block("extract_immediate_assignment", |
| gr::io_signature::make(0, 0, 0), |
| gr::io_signature::make(0, 0, 0)) |
| { |
| d_print_immediate_assignments = print_immediate_assignments; |
| d_ignore_gprs = ignore_gprs; |
| d_unique_references = unique_references; |
| message_port_register_in(pmt::mp("msgs")); |
| set_msg_handler(pmt::mp("msgs"), boost::bind(&extract_immediate_assignment_impl::process_message, this, _1)); |
| } |
| |
| /* |
| * Our virtual destructor. |
| */ |
| extract_immediate_assignment_impl::~extract_immediate_assignment_impl() |
| { |
| } |
| } /* namespace gsm */ |
| } /* namespace gr */ |
| |