mirror of https://github.com/gnss-sdr/gnss-sdr
449 lines
16 KiB
C++
449 lines
16 KiB
C++
/*!
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* \file gr_complex_ip_packet_source.cc
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*
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* \brief Receives ip frames containing samples in UDP frame encapsulation
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* using a high performance packet capture library (libpcap)
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* \author Javier Arribas jarribas (at) cttc.es
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR 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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* GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#include "gr_complex_ip_packet_source.h"
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#include <gnuradio/io_signature.h>
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#include <utility>
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const int FIFO_SIZE = 1472000;
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/* 4 bytes IP address */
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typedef struct gr_ip_address
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{
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u_char byte1;
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u_char byte2;
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u_char byte3;
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u_char byte4;
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} gr_ip_address;
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/* IPv4 header */
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typedef struct gr_ip_header
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{
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u_char ver_ihl; // Version (4 bits) + Internet header length (4 bits)
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u_char tos; // Type of service
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u_short tlen; // Total length
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u_short identification; // Identification
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u_short flags_fo; // Flags (3 bits) + Fragment offset (13 bits)
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u_char ttl; // Time to live
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u_char proto; // Protocol
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u_short crc; // Header checksum
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gr_ip_address saddr; // Source address
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gr_ip_address daddr; // Destination address
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u_int op_pad; // Option + Padding
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} gr_ip_header;
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/* UDP header*/
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typedef struct gr_udp_header
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{
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u_short sport; // Source port
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u_short dport; // Destination port
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u_short len; // Datagram length
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u_short crc; // Checksum
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} gr_udp_header;
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gr_complex_ip_packet_source::sptr
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gr_complex_ip_packet_source::make(std::string src_device,
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const std::string& origin_address,
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int udp_port,
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int udp_packet_size,
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int n_baseband_channels,
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const std::string& wire_sample_type,
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size_t item_size,
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bool IQ_swap_)
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{
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return gnuradio::get_initial_sptr(new gr_complex_ip_packet_source(std::move(src_device),
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origin_address,
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udp_port,
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udp_packet_size,
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n_baseband_channels,
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wire_sample_type,
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item_size,
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IQ_swap_));
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}
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/*
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* The private constructor
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*/
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gr_complex_ip_packet_source::gr_complex_ip_packet_source(std::string src_device,
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__attribute__((unused)) const std::string& origin_address,
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int udp_port,
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int udp_packet_size,
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int n_baseband_channels,
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const std::string& wire_sample_type,
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size_t item_size,
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bool IQ_swap_)
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: gr::sync_block("gr_complex_ip_packet_source",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(1, 4, item_size)) // 1 to 4 baseband complex channels
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{
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std::cout << "Start Ethernet packet capture\n";
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d_n_baseband_channels = n_baseband_channels;
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if (wire_sample_type == "cbyte")
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{
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d_wire_sample_type = 1;
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d_bytes_per_sample = d_n_baseband_channels * 2;
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}
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else if (wire_sample_type == "c4bits")
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{
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d_wire_sample_type = 2;
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d_bytes_per_sample = d_n_baseband_channels;
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}
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else
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{
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std::cout << "Unknown wire sample type\n";
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exit(0);
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}
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std::cout << "d_wire_sample_type:" << d_wire_sample_type << std::endl;
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d_src_device = std::move(src_device);
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d_udp_port = udp_port;
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d_udp_payload_size = udp_packet_size;
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d_fifo_full = false;
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// allocate signal samples buffer
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fifo_buff = new char[FIFO_SIZE];
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fifo_read_ptr = 0;
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fifo_write_ptr = 0;
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fifo_items = 0;
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d_item_size = item_size;
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d_IQ_swap = IQ_swap_;
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d_sock_raw = 0;
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d_pcap_thread = nullptr;
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descr = nullptr;
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memset(reinterpret_cast<char *>(&si_me), 0, sizeof(si_me));
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}
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// Called by gnuradio to enable drivers, etc for i/o devices.
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bool gr_complex_ip_packet_source::start()
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{
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std::cout << "gr_complex_ip_packet_source START\n";
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// open the ethernet device
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if (open() == true)
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{
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// start pcap capture thread
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d_pcap_thread = new boost::thread(boost::bind(&gr_complex_ip_packet_source::my_pcap_loop_thread, this, descr));
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return true;
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}
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else
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{
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return false;
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}
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}
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// Called by gnuradio to disable drivers, etc for i/o devices.
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bool gr_complex_ip_packet_source::stop()
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{
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std::cout << "gr_complex_ip_packet_source STOP\n";
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if (descr != nullptr)
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{
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pcap_breakloop(descr);
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d_pcap_thread->join();
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pcap_close(descr);
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}
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return true;
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}
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bool gr_complex_ip_packet_source::open()
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{
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char errbuf[PCAP_ERRBUF_SIZE];
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boost::mutex::scoped_lock lock(d_mutex); // hold mutex for duration of this function
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// open device for reading
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descr = pcap_open_live(d_src_device.c_str(), 1500, 1, 1000, errbuf);
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if (descr == nullptr)
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{
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std::cout << "Error opening Ethernet device " << d_src_device << std::endl;
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std::cout << "Fatal Error in pcap_open_live(): " << std::string(errbuf) << std::endl;
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return false;
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}
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// bind UDP port to avoid automatic reply with ICMP port unreachable packets from kernel
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d_sock_raw = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (d_sock_raw == -1)
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{
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std::cout << "Error opening UDP socket" << std::endl;
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return false;
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}
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// zero out the structure
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memset(reinterpret_cast<char *>(&si_me), 0, sizeof(si_me));
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si_me.sin_family = AF_INET;
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si_me.sin_port = htons(d_udp_port);
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si_me.sin_addr.s_addr = htonl(INADDR_ANY);
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// bind socket to port
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if (bind(d_sock_raw, reinterpret_cast<struct sockaddr *>(&si_me), sizeof(si_me)) == -1)
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{
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std::cout << "Error opening UDP socket" << std::endl;
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return false;
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}
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return true;
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}
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gr_complex_ip_packet_source::~gr_complex_ip_packet_source()
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{
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if (d_pcap_thread != nullptr)
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{
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delete d_pcap_thread;
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}
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delete fifo_buff;
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std::cout << "Stop Ethernet packet capture\n";
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}
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void gr_complex_ip_packet_source::static_pcap_callback(u_char *args, const struct pcap_pkthdr *pkthdr,
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const u_char *packet)
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{
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auto *bridge = reinterpret_cast<gr_complex_ip_packet_source *>(args);
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bridge->pcap_callback(args, pkthdr, packet);
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}
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void gr_complex_ip_packet_source::pcap_callback(__attribute__((unused)) u_char *args, __attribute__((unused)) const struct pcap_pkthdr *pkthdr,
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const u_char *packet)
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{
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boost::mutex::scoped_lock lock(d_mutex); // hold mutex for duration of this function
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const gr_ip_header *ih;
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const gr_udp_header *uh;
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// eth frame parameters
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// **** UDP RAW PACKET DECODER ****
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if ((packet[12] == 0x08) & (packet[13] == 0x00)) // IP FRAME
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{
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// retrieve the position of the ip header
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ih = reinterpret_cast<const gr_ip_header *>(packet + 14); // length of ethernet header
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// retrieve the position of the udp header
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u_int ip_len;
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ip_len = (ih->ver_ihl & 0xf) * 4;
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uh = reinterpret_cast<const gr_udp_header *>(reinterpret_cast<const u_char *>(ih) + ip_len);
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// convert from network byte order to host byte order
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//u_short sport;
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u_short dport;
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dport = ntohs(uh->dport);
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//sport = ntohs(uh->sport);
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if (dport == d_udp_port)
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{
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// print ip addresses and udp ports
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// printf("%d.%d.%d.%d.%d -> %d.%d.%d.%d.%d\n",
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// ih->saddr.byte1,
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// ih->saddr.byte2,
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// ih->saddr.byte3,
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// ih->saddr.byte4,
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// sport,
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// ih->daddr.byte1,
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// ih->daddr.byte2,
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// ih->daddr.byte3,
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// ih->daddr.byte4,
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// dport);
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// std::cout<<"uh->len:"<<ntohs(uh->len)<<std::endl;
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int payload_length_bytes = ntohs(uh->len) - 8; // total udp packet length minus the header length
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// read the payload bytes and insert them into the shared circular buffer
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const u_char *udp_payload = (reinterpret_cast<const u_char *>(uh) + sizeof(gr_udp_header));
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if (fifo_items <= (FIFO_SIZE - payload_length_bytes))
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{
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int aligned_write_items = FIFO_SIZE - fifo_write_ptr;
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if (aligned_write_items >= payload_length_bytes)
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{
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// write all in a single memcpy
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memcpy(&fifo_buff[fifo_write_ptr], &udp_payload[0], payload_length_bytes); // size in bytes
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fifo_write_ptr += payload_length_bytes;
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if (fifo_write_ptr == FIFO_SIZE) fifo_write_ptr = 0;
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fifo_items += payload_length_bytes;
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}
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else
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{
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// two step wrap write
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memcpy(&fifo_buff[fifo_write_ptr], &udp_payload[0], aligned_write_items); // size in bytes
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fifo_write_ptr = payload_length_bytes - aligned_write_items;
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memcpy(&fifo_buff[0], &udp_payload[aligned_write_items], fifo_write_ptr); // size in bytes
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fifo_items += payload_length_bytes;
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}
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}
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else
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{
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// notify overflow
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std::cout << "O" << std::flush;
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}
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}
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}
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}
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void gr_complex_ip_packet_source::my_pcap_loop_thread(pcap_t *pcap_handle)
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{
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pcap_loop(pcap_handle, -1, gr_complex_ip_packet_source::static_pcap_callback, reinterpret_cast<u_char *>(this));
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}
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void gr_complex_ip_packet_source::demux_samples(gr_vector_void_star output_items, int num_samples_readed)
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{
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int8_t real;
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int8_t imag;
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uint8_t tmp_char2;
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for (int n = 0; n < num_samples_readed; n++)
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{
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switch (d_wire_sample_type)
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{
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case 1: // interleaved byte samples
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for (auto & output_item : output_items)
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{
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real = fifo_buff[fifo_read_ptr++];
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imag = fifo_buff[fifo_read_ptr++];
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if (d_IQ_swap)
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{
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static_cast<gr_complex *>(output_item)[n] = gr_complex(real, imag);
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}
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else
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{
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static_cast<gr_complex *>(output_item)[n] = gr_complex(imag, real);
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}
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}
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break;
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case 2: // 4-bit samples
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for (auto & output_item : output_items)
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{
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tmp_char2 = fifo_buff[fifo_read_ptr] & 0x0F;
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if (tmp_char2 >= 8)
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{
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real = 2 * (tmp_char2 - 16) + 1;
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}
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else
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{
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real = 2 * tmp_char2 + 1;
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}
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tmp_char2 = fifo_buff[fifo_read_ptr++] >> 4;
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tmp_char2 = tmp_char2 & 0x0F;
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if (tmp_char2 >= 8)
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{
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imag = 2 * (tmp_char2 - 16) + 1;
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}
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else
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{
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imag = 2 * tmp_char2 + 1;
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}
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if (d_IQ_swap)
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{
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static_cast<gr_complex *>(output_item)[n] = gr_complex(imag, real);
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}
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else
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{
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static_cast<gr_complex *>(output_item)[n] = gr_complex(real, imag);
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}
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}
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break;
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default:
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std::cout << "Unknown wire sample type\n";
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exit(0);
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}
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if (fifo_read_ptr == FIFO_SIZE) fifo_read_ptr = 0;
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}
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}
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int gr_complex_ip_packet_source::work(int noutput_items,
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__attribute__((unused)) gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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// send samples to next GNU Radio block
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boost::mutex::scoped_lock lock(d_mutex); // hold mutex for duration of this function
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if (fifo_items == 0) return 0;
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if (output_items.size() > static_cast<long unsigned int>(d_n_baseband_channels))
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{
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std::cout << "Configuration error: more baseband channels connected than the available in the UDP source\n";
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exit(0);
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}
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int num_samples_readed;
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int bytes_requested;
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switch (d_wire_sample_type)
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{
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case 1: // complex byte samples
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bytes_requested = noutput_items * d_bytes_per_sample;
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if (bytes_requested < fifo_items)
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{
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num_samples_readed = noutput_items; // read all
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}
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else
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{
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num_samples_readed = fifo_items / d_bytes_per_sample; // read what we have
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}
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break;
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case 2: // complex 4 bits samples
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bytes_requested = noutput_items * d_bytes_per_sample;
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if (bytes_requested < fifo_items)
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{
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num_samples_readed = noutput_items; // read all
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}
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else
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{
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num_samples_readed = fifo_items / d_bytes_per_sample; // read what we have
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}
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break;
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default: // complex byte samples
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bytes_requested = noutput_items * d_bytes_per_sample;
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if (bytes_requested < fifo_items)
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{
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num_samples_readed = noutput_items; // read all
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}
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else
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{
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num_samples_readed = fifo_items / d_bytes_per_sample; // read what we have
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}
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}
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bytes_requested = num_samples_readed * d_bytes_per_sample;
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// read all in a single loop
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demux_samples(output_items, num_samples_readed); // it also increases the fifo read pointer
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// update fifo items
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fifo_items = fifo_items - bytes_requested;
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for (long unsigned int n = 0; n < output_items.size(); n++)
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{
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produce(static_cast<int>(n), num_samples_readed);
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}
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return this->WORK_CALLED_PRODUCE;
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}
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