365bd347a6
Packet format and common utilities for the Internet Control Message Protocol. Issue #2732
96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/*
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* \brief Internet Control Message Protocol
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* \author Martin Stein
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* \date 2018-03-23
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*/
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/*
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* Copyright (C) 2018 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 _NET__ICMP_H_
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#define _NET__ICMP_H_
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/* Genode includes */
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#include <util/endian.h>
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#include <base/exception.h>
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namespace Genode { class Output; }
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namespace Net { class Icmp_packet; }
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class Net::Icmp_packet
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{
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private:
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Genode::uint8_t _type;
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Genode::uint8_t _code;
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Genode::uint16_t _checksum;
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union {
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Genode::uint32_t _rest_of_header_u32[1];
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Genode::uint16_t _rest_of_header_u16[2];
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Genode::uint8_t _rest_of_header_u8[4];
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};
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Genode::uint8_t _data[0];
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public:
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struct Bad_data_type : Genode::Exception { };
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enum class Type
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{
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ECHO_REPLY = 0,
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DST_UNREACHABLE = 3,
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ECHO_REQUEST = 8,
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};
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enum class Code
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{
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DST_NET_UNREACHABLE = 0,
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ECHO_REQUEST = 0,
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ECHO_REPLY = 0,
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};
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Genode::uint16_t calc_checksum(Genode::size_t data_sz) const;
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/***************
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** Accessors **
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***************/
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Type type() const { return (Type)_type; }
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Code code() const { return (Code)_code; }
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Genode::uint16_t checksum() const { return host_to_big_endian(_checksum); }
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Genode::uint16_t query_id() const { return host_to_big_endian(_rest_of_header_u16[0]); }
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Genode::uint16_t query_seq() const { return host_to_big_endian(_rest_of_header_u16[1]); }
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Genode::uint32_t rest_of_header() const { return host_to_big_endian(_rest_of_header_u32[0]); }
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template <typename T> T &data(Genode::size_t data_size)
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{
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if (data_size < sizeof(T)) {
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throw Bad_data_type();
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}
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return *(T *)(_data);
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}
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void type(Type v) { _type = (Genode::uint8_t)v; }
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void code(Code v) { _code = (Genode::uint8_t)v; }
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void checksum(Genode::uint16_t v) { _checksum = host_to_big_endian(v); }
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void rest_of_header(Genode::uint32_t v) { _rest_of_header_u32[0] = host_to_big_endian(v); }
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void query_id(Genode::uint16_t v) { _rest_of_header_u16[0] = host_to_big_endian(v); }
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void query_seq(Genode::uint16_t v) { _rest_of_header_u16[1] = host_to_big_endian(v); }
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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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#endif /* _NET__ICMP_H_ */
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