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143 lines
3.0 KiB
C++
143 lines
3.0 KiB
C++
/*
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* \brief Ethernet protocol
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* \author Stefan Kalkowski
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* \date 2010-08-19
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*/
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/*
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* Copyright (C) 2010-2017 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 _NET__ETHERNET_H_
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#define _NET__ETHERNET_H_
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/* Genode includes */
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#include <base/exception.h>
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#include <util/string.h>
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#include <util/endian.h>
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#include <net/mac_address.h>
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namespace Net
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{
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class Ethernet_frame;
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template <Genode::size_t DATA_SIZE>
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class Ethernet_frame_sized;
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}
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/**
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* Data layout of this class conforms to the Ethernet II frame
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* (IEEE 802.3).
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*
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* Ethernet-frame-header-format:
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*
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* ----------------------------------------------------------
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* | destination mac address | source mac address | ethertype |
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* | 6 bytes | 6 bytes | 2 bytes |
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* ----------------------------------------------------------
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*/
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class Net::Ethernet_frame
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{
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public:
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enum Size {
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ADDR_LEN = 6, /* MAC address length in bytes */
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};
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static const Mac_address BROADCAST; /* broadcast address */
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private:
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Genode::uint8_t _dst[ADDR_LEN]; /* destination mac address */
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Genode::uint8_t _src[ADDR_LEN]; /* source mac address */
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Genode::uint16_t _type; /* encapsulated protocol */
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unsigned _data[0]; /* encapsulated data */
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public:
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enum { MIN_SIZE = 64 };
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/**
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* Id representing encapsulated protocol.
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*/
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enum class Type : Genode::uint16_t {
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IPV4 = 0x0800,
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ARP = 0x0806,
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};
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struct Bad_data_type : Genode::Exception { };
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template <typename T> T const *data(Genode::size_t data_size) const
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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 const *)(_data);
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}
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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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/***************
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** Accessors **
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***************/
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Mac_address dst() const { return Mac_address((void *)_dst); }
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Mac_address src() const { return Mac_address((void *)_src); }
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Type type() const { return (Type)host_to_big_endian(_type); }
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void dst(Mac_address v) { v.copy(&_dst); }
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void src(Mac_address v) { v.copy(&_src); }
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void type(Type type) { _type = host_to_big_endian((Genode::uint16_t)type); }
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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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} __attribute__((packed));
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template <Genode::size_t DATA_SIZE>
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class Net::Ethernet_frame_sized : public Ethernet_frame
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{
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private:
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enum {
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HS = sizeof(Ethernet_frame),
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DS = DATA_SIZE + HS >= MIN_SIZE ? DATA_SIZE : MIN_SIZE - HS,
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};
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Genode::uint8_t _data[DS];
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Genode::uint32_t _checksum;
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public:
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Ethernet_frame_sized(Mac_address dst_in, Mac_address src_in,
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Type type_in)
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:
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Ethernet_frame(sizeof(Ethernet_frame))
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{
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dst(dst_in);
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src(src_in);
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type(type_in);
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}
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} __attribute__((packed));
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#endif /* _NET__ETHERNET_H_ */
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