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nic_dump: configurable packet print
The nic_dump uses a wrapper for all supported protocols that takes a packet and a verbosity configuration. The wrapper object can than be used as argument for a Genode log function and prints the packet's contents according to the given configuration. The configuration is a distinct class to enable the reuse of one instance for different packets. There are currently 4 possible configurations for each protocol: * NONE (no output for this protocol) * SHORT (only the protocol name) * COMPACT (the most important information densely packed) * COMPREHENSIVE (all header information of this protocol) Ref #2490
This commit is contained in:
Martin Stein
Christian Helmuth
parent
d63c40af3e
commit
71bd9a1f10
@ -16,6 +16,7 @@
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/* Genode includes */
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#include <net/ethernet.h>
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#include <packet_log.h>
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using namespace Net;
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using namespace Genode;
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@ -28,18 +29,20 @@ void Interface::_handle_eth(void *const eth_base,
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try {
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Ethernet_frame ð = *new (eth_base) Ethernet_frame(eth_size);
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Interface &remote = _remote.deref();
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Packet_log_config log_cfg;
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if (_log_time) {
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Genode::Duration const new_time = _timer.curr_time();
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unsigned long const new_time_ms = new_time.trunc_to_plain_us().value / 1000;
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unsigned long const old_time_ms = _curr_time.trunc_to_plain_us().value / 1000;
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log("\033[33m(", remote._label, " <- ", _label, ")\033[0m ", eth,
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" \033[33mtime ", new_time_ms, " ms (Δ ",
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new_time_ms - old_time_ms, " ms)\033[0m");
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log("\033[33m(", remote._label, " <- ", _label, ")\033[0m ",
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packet_log(eth, log_cfg), " \033[33mtime ", new_time_ms,
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" ms (Δ ", new_time_ms - old_time_ms, " ms)\033[0m");
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_curr_time = new_time;
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} else {
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log("\033[33m(", remote._label, " <- ", _label, ")\033[0m ", eth);
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log("\033[33m(", remote._label, " <- ", _label, ")\033[0m ", packet_log(eth, log_cfg));
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}
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remote._send(eth, eth_size);
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}
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290
repos/os/src/server/nic_dump/packet_log.cc
Normal file
290
repos/os/src/server/nic_dump/packet_log.cc
Normal file
@ -0,0 +1,290 @@
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/*
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* \brief Configurable print functionality for network packets
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* \author Martin Stein
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* \date 2017-09-27
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* local includes */
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#include <packet_log.h>
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using namespace Genode;
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using namespace Net;
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template <>
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void Packet_log<Dhcp_packet>::print(Output &output) const
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{
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using Genode::print;
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/* print header attributes */
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switch (_cfg.dhcp) {
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case Packet_log_style::COMPREHENSIVE:
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print(output, "\033[32mDHCP\033[0m");
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print(output, " op ", _pkt.op());
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print(output, " htyp ", (uint8_t)_pkt.htype());
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print(output, " hlen ", _pkt.hlen());
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print(output, " hps ", _pkt.hops());
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print(output, " xid ", _pkt.xid());
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print(output, " sec ", _pkt.secs());
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print(output, " flg ", Hex(_pkt.flags()));
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print(output, " ci ", _pkt.ciaddr());
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print(output, " yi ", _pkt.yiaddr());
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print(output, " si ", _pkt.siaddr());
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print(output, " gi ", _pkt.giaddr());
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print(output, " ch ", _pkt.client_mac());
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print(output, " srv ", _pkt.server_name());
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print(output, " file ", _pkt.file());
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print(output, " mag ", _pkt.magic_cookie());
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print(output, " opt");
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_pkt.for_each_option([&] (Dhcp_packet::Option &opt) {
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print(output, " ", opt);
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});
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break;
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case Packet_log_style::COMPACT:
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print(output, _pkt);
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break;
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case Packet_log_style::SHORT:
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print(output, "\033[32mDHCP\033[0m");
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break;
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default: ;
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}
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}
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void Dhcp_packet::Option::print(Output &output) const
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{
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using Genode::print;
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print(output, _code, ":", _len);
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if (!len()) {
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return;
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}
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print(output, ":");
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for (unsigned j = 0; j < len(); j++) {
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print(output, Hex(_value[j], Hex::OMIT_PREFIX, Hex::PAD));
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}
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}
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template <>
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void Packet_log<Arp_packet>::print(Output &output) const
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{
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using Genode::print;
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/* print header attributes */
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switch (_cfg.arp) {
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case Packet_log_style::COMPREHENSIVE:
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print(output, "\033[32mARP\033[0m");
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print(output, " hw ", _pkt.hardware_address_type());
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print(output, " prot ", _pkt.protocol_address_type());
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print(output, " hwsz ", _pkt.hardware_address_size());
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print(output, " protsz ", _pkt.protocol_address_size());
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print(output, " op ", _pkt.opcode());
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if (_pkt.ethernet_ipv4()) {
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print(output, " srcmac ", _pkt.src_mac());
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print(output, " srcip ", _pkt.src_ip());
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print(output, " dstmac ", _pkt.dst_mac());
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print(output, " dstip ", _pkt.dst_ip());
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} else {
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print(output, " ...");
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}
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break;
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case Packet_log_style::COMPACT:
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print(output, _pkt);
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break;
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case Packet_log_style::SHORT:
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print(output, "\033[32mARP\033[0m");
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break;
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default: ;
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}
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}
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template <>
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void Packet_log<Ethernet_frame>::print(Output &output) const
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{
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using Genode::print;
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/* print header attributes */
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switch (_cfg.eth) {
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case Packet_log_style::COMPREHENSIVE:
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print(output, "\033[32mETH\033[0m");
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print(output, " src ", _pkt.src());
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print(output, " dst ", _pkt.dst());
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print(output, " typ ", (Genode::uint16_t)_pkt.type());
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break;
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case Packet_log_style::COMPACT:
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print(output, _pkt);
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break;
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case Packet_log_style::SHORT:
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print(output, "\033[32mETH\033[0m");
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break;
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default: ;
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}
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/* print encapsulated packet */
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switch (_pkt.type()) {
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case Ethernet_frame::Type::ARP:
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print(output, " ", packet_log(*_pkt.data<Arp_packet const>(), _cfg));
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break;
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case Ethernet_frame::Type::IPV4:
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print(output, " ", packet_log(*_pkt.data<Ipv4_packet const>(), _cfg));
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break;
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default: ;
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}
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}
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template <>
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void Packet_log<Ipv4_packet>::print(Output &output) const
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{
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using Genode::print;
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/* print header attributes */
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switch (_cfg.ipv4) {
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case Packet_log_style::COMPREHENSIVE:
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print(output, "\033[32mIPV4\033[0m");
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print(output, " hdrlen ", _pkt.header_length());
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print(output, " ver ", _pkt.version());
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print(output, " dsrv ", _pkt.diff_service());
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print(output, " ecn ", _pkt.ecn());
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print(output, " len ", _pkt.total_length());
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print(output, " id ", _pkt.identification());
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print(output, " flg ", _pkt.flags());
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print(output, " frgoff ", _pkt.fragment_offset());
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print(output, " ttl ", _pkt.time_to_live());
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print(output, " prot ", (uint8_t)_pkt.protocol());
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print(output, " crc ", _pkt.checksum());
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print(output, " src ", _pkt.src());
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print(output, " dst ", _pkt.dst());
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break;
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case Packet_log_style::COMPACT:
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print(output, _pkt);
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break;
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case Packet_log_style::SHORT:
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print(output, "\033[32mIPV4\033[0m");
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break;
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default: ;
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}
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/* print encapsulated packet */
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switch (_pkt.protocol()) {
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case Ipv4_packet::Protocol::TCP:
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print(output, " ", packet_log(*_pkt.data<Tcp_packet const>(), _cfg));
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break;
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case Ipv4_packet::Protocol::UDP:
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print(output, " ", packet_log(*_pkt.data<Udp_packet const>(), _cfg));
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break;
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default: ; }
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}
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template <>
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void Packet_log<Tcp_packet>::print(Output &output) const
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{
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using Genode::print;
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/* print header attributes */
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switch (_cfg.tcp) {
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case Packet_log_style::COMPREHENSIVE:
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print(output, "\033[32mTCP\033[0m");
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print(output, " src ", _pkt.src_port());
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print(output, " dst ", _pkt.dst_port());
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print(output, " seqn ", _pkt.seq_nr());
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print(output, " ackn ", _pkt.ack_nr());
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print(output, " doff ", _pkt.data_offset());
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print(output, " flg ", _pkt.flags());
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print(output, " winsz ", _pkt.window_size());
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print(output, " crc ", _pkt.checksum());
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print(output, " urgp ", _pkt.urgent_ptr());
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break;
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case Packet_log_style::COMPACT:
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print(output, _pkt);
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break;
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case Packet_log_style::SHORT:
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print(output, "\033[32mTCP\033[0m");
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break;
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default: ;
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}
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}
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template <>
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void Packet_log<Udp_packet>::print(Output &output) const
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{
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using Genode::print;
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/* print header attributes */
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switch (_cfg.udp) {
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case Packet_log_style::COMPREHENSIVE:
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print(output, "\033[32mUDP\033[0m");
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print(output, " src ", _pkt.src_port());
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print(output, " dst ", _pkt.dst_port());
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print(output, " len ", _pkt.length());
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print(output, " crc ", _pkt.checksum());
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break;
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case Packet_log_style::COMPACT:
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print(output, _pkt);
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break;
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case Packet_log_style::SHORT:
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print(output, "\033[32mUDP\033[0m");
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break;
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default: ;
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}
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/* print encapsulated packet */
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if (Dhcp_packet::is_dhcp(&_pkt)) {
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print(output, " ", packet_log(*_pkt.data<Dhcp_packet const>(), _cfg));
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}
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}
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119
repos/os/src/server/nic_dump/packet_log.h
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119
repos/os/src/server/nic_dump/packet_log.h
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@ -0,0 +1,119 @@
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/*
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* \brief Configurable print functionality for network packets
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* \author Stefan Kalkowski
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* \author Martin Stein
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* \date 2017-09-27
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*/
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/*
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* Copyright (C) 2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _PACKET_LOG_H_
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#define _PACKET_LOG_H_
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/* Genode includes */
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#include <base/stdint.h>
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#include <net/arp.h>
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#include <net/udp.h>
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#include <net/dhcp.h>
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#include <net/ethernet.h>
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#include <net/tcp.h>
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#include <net/ipv4.h>
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namespace Net {
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enum class Packet_log_style : Genode::uint8_t
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{
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NONE, SHORT, COMPACT, COMPREHENSIVE,
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};
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struct Packet_log_config;
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template <typename PKT>
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struct Packet_log;
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}
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/**
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* Configuration for the print functionality of network packets
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*/
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struct Net::Packet_log_config
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{
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using Style = Packet_log_style;
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Style eth, arp, ipv4, dhcp, udp, tcp;
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Packet_log_config(Style def = Style::COMPACT)
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: eth(def), arp(def), ipv4(def), dhcp(def), udp(def), tcp(def) { }
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Packet_log_config(Style eth,
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Style arp,
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Style ipv4,
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Style dhcp,
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Style udp,
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Style tcp)
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: eth(eth), arp(arp), ipv4(ipv4), dhcp(dhcp), udp(udp), tcp(tcp) { }
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};
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/**
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* Wrapper for network packets to configure their print functionality
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*/
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template <typename PKT>
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class Net::Packet_log
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{
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private:
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PKT const &_pkt;
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Packet_log_config const &_cfg;
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public:
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Packet_log(PKT const &pkt, Packet_log_config const &cfg)
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: _pkt(pkt), _cfg(cfg) { }
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/*********
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** log **
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*********/
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void print(Genode::Output &output) const;
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};
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namespace Net {
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/* getting an instances via a function enables template-arg deduction */
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template <typename PKT>
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Packet_log<PKT> packet_log(PKT const &pkt, Packet_log_config const &cfg) {
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return Packet_log<PKT>(pkt, cfg); }
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/************************************************************
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** Packet log specializations for all supported protocols **
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************************************************************/
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template <>
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void Packet_log<Arp_packet>::print(Genode::Output &output) const;
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template <>
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void Packet_log<Ethernet_frame>::print(Genode::Output &output) const;
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template <>
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void Packet_log<Dhcp_packet>::print(Genode::Output &output) const;
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template <>
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void Packet_log<Ipv4_packet>::print(Genode::Output &output) const;
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template <>
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void Packet_log<Tcp_packet>::print(Genode::Output &output) const;
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template <>
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void Packet_log<Udp_packet>::print(Genode::Output &output) const;
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}
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#endif /* _PACKET_LOG_H_ */
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@ -2,6 +2,6 @@ TARGET = nic_dump
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LIBS += base net
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SRC_CC += component.cc main.cc uplink.cc interface.cc
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SRC_CC += component.cc main.cc packet_log.cc uplink.cc interface.cc
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INC_DIR += $(PRG_DIR)
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