112 lines
2.7 KiB
C++
112 lines
2.7 KiB
C++
/*
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* \brief Simple Network Time Protocol (SNTP) Version 4 (RFC 4330)
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* \author Martin Stein
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* \date 2019-07-11
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*/
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/*
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* Copyright (C) 2019 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__SNTP_H_
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#define _NET__SNTP_H_
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/* Genode includes */
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#include <util/register.h>
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namespace Net
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{
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class Sntp_timestamp;
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class Sntp_packet;
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}
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class Net::Sntp_timestamp
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{
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private:
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using uint32_t = Genode::uint32_t;
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using uint64_t = Genode::uint64_t;
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enum { UNIX_TS_OFFSET_SEC = 2208988800 };
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uint32_t const _seconds;
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uint32_t const _seconds_fraction;
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public:
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Sntp_timestamp(uint64_t const plain_value)
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:
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_seconds { (uint32_t)(plain_value >> 32) },
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_seconds_fraction { (uint32_t)(plain_value) }
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{ }
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uint64_t to_unix_timestamp() const
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{
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return _seconds - UNIX_TS_OFFSET_SEC;
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}
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static Sntp_timestamp from_unix_timestamp(uint64_t const unix_ts)
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{
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return unix_ts + UNIX_TS_OFFSET_SEC;
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}
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/***************
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** Accessors **
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***************/
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uint32_t seconds() const { return _seconds; }
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uint32_t seconds_fraction() const { return _seconds_fraction; }
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};
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class Net::Sntp_packet
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{
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private:
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Genode::uint8_t _byte_0;
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Genode::uint8_t _stratum;
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Genode::uint8_t _poll;
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Genode::uint8_t _precision;
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Genode::uint32_t _root_delay;
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Genode::uint32_t _root_dispersion;
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Genode::uint32_t _reference_identifier;
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Genode::uint64_t _reference_timestamp;
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Genode::uint64_t _originate_timestamp;
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Genode::uint64_t _receive_timestamp;
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Genode::uint64_t _transmit_timestamp;
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struct Byte_0 : Genode::Register<8> {
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struct Mode : Bitfield<0, 3> { };
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struct Version_number : Bitfield<3, 3> { };
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};
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public:
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enum { UDP_PORT = 123 };
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enum { VERSION_NUMBER = 4 };
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enum { MODE_CLIENT = 3 };
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enum { MODE_SERVER = 4 };
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/***************
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** Accessors **
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***************/
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void version_number(Genode::uint8_t v) { Byte_0::Version_number::set(_byte_0, v); }
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void mode (Genode::uint8_t v) { Byte_0::Mode ::set(_byte_0, v); }
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Byte_0::access_t version_number() const { return Byte_0::Version_number::get(_byte_0); }
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Byte_0::access_t mode() const { return Byte_0::Mode::get(_byte_0); }
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Genode::uint64_t transmit_timestamp() const { return host_to_big_endian(_transmit_timestamp); }
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Genode::uint64_t receive_timestamp() const { return host_to_big_endian(_receive_timestamp); }
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Genode::uint64_t originate_timestamp() const { return host_to_big_endian(_originate_timestamp); }
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} __attribute__((packed));
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#endif /* _NET__SNTP_H_ */
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