296 lines
8.3 KiB
C++
296 lines
8.3 KiB
C++
/*
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* \brief Address resolution protocol
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* \author Stefan Kalkowski
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* \date 2010-08-24
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*
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* ARP is used to determine a network host's link layer or
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* hardware address when only its Network Layer address is known.
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*/
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/*
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* Copyright (C) 2010-2013 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 General Public License version 2.
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*/
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#ifndef _NET__ARP_H_
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#define _NET__ARP_H_
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/* Genode */
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#include <base/exception.h>
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#include <base/stdint.h>
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#include <util/endian.h>
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#include <net/ethernet.h>
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#include <net/ipv4.h>
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namespace Net { class Arp_packet; }
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/**
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* Data layout of this class conforms to an ARP-packet (RFC 826)
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*
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* It's reduced to Internet protocol (IPv4) over Ethernet.
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*
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* ARP-packet-format:
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*
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* --------------------------------------------------------------------
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* | Bit 0-7 | Bit 8-15 | Bit 16-23 | Bit 24-31 |
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* --------------------------------------------------------------------
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* | hw.addr.type | prot.addr.type |
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* --------------------------------------------------------------------
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* | hw.addr.size | prot.addr.size | operation |
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* --------------------------------------------------------------------
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* | source-mac-address |
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* --------------------------------------------------------------------
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* | source-mac-address | source-ip-address |
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* --------------------------------------------------------------------
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* | source-ip-address | dest.-mac-address |
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* --------------------------------------------------------------------
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* | dest.-mac-address |
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* --------------------------------------------------------------------
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* | dest.-ip-address |
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* --------------------------------------------------------------------
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*/
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class Net::Arp_packet
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{
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private:
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/***********************
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** ARP header fields **
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***********************/
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Genode::uint16_t _hw_addr_type;
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Genode::uint16_t _prot_addr_type;
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Genode::uint8_t _hw_addr_sz;
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Genode::uint8_t _prot_addr_sz;
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Genode::uint16_t _opcode;
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Genode::uint8_t _src_mac_addr[Ethernet_frame::ADDR_LEN];
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Genode::uint8_t _src_ip_addr[Ipv4_packet::ADDR_LEN];
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Genode::uint8_t _dst_mac_addr[Ethernet_frame::ADDR_LEN];
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Genode::uint8_t _dst_ip_addr[Ipv4_packet::ADDR_LEN];
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public:
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/********************
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** ARP parameters **
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********************/
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enum Hardware_type {
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ETHERNET = 0x0001,
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EXP_ETHERNET = 0x0002,
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AX_25 = 0x0003,
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TOKEN_RING = 0x0004,
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CHAOS = 0x0005,
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IEEE802_NET = 0x0006,
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ARCNET = 0x0007,
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HYPERCHANNEL = 0x0008,
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LANSTAR = 0x0009,
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AUTONET = 0x000A,
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LOCALTALK = 0x000B,
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LOCALNET = 0x000C,
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ULTRA_LINK = 0x000D,
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SMDS = 0x000E,
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FRAME_RELAY = 0x000F,
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ATM_1 = 0x0010,
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HDLC = 0x0011,
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FIBRE_CHANNEL = 0x0012,
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ATM_2 = 0x0013,
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SERIAL_LINE = 0x0014,
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ATM_3 = 0x0015,
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MIL_STD_188_220 = 0x0016,
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METRICOM = 0x0017,
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IEEE1394 = 0x0018,
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MAPOS = 0x0019,
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TWINAXIAL = 0x001A,
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EUI_64 = 0x001B,
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HIPARP = 0x001C,
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IP_AND_ARP_OVER_ISO7816 = 0x001D,
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ARPSEC = 0x001E,
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IPSEC_TUNNEL = 0x001F,
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INFINIBAND = 0x0020,
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TIA_102 = 0x0021,
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WIEGAND_INTERFACE = 0x0022,
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Pure_IP = 0x0023,
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HW_EXP1 = 0x0024,
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HFI = 0x0025,
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HW_EXP2 = 0x0100,
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};
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enum Opcode {
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REQUEST = 0x0001,
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REPLY = 0x0002,
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REQUEST_REVERSE = 0x0003,
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REPLY_REVERSE = 0x0004,
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DRARP_REQUEST = 0x0005,
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DRARP_REPLY = 0x0006,
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DRARP_ERROR = 0x0007,
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INARP_REQUEST = 0x0008,
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INARP_REPLY = 0x0009,
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ARP_NAK = 0x000A,
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MARS_REQUEST = 0x000B,
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MARS_MULTI = 0x000C,
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MARS_MSERV = 0x000D,
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MARS_JOIN = 0x000E,
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MARS_LEAVE = 0x000F,
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MARS_NAK = 0x0010,
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MARS_UNSERV = 0x0011,
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MARS_SJOIN = 0x0012,
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MARS_SLEAVE = 0x0013,
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MARS_GROUPLIST_REQUEST = 0x0014,
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MARS_GROUPLIST_REPLY = 0x0015,
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MARS_REDIRECT_MAP = 0x0016,
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MAPOS_UNARP = 0x0017,
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OP_EXP1 = 0x0018,
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OP_EXP2 = 0x0019
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};
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/**
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* Exception used to indicate protocol violation.
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*/
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class No_arp_packet : Genode::Exception {};
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/*****************
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** Constructor **
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*****************/
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Arp_packet(Genode::size_t size) {
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/* arp packet needs to fit in */
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if (size < sizeof(Arp_packet))
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throw No_arp_packet();
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}
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/******************************
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** ARP field read-accessors **
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******************************/
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/**
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* \return link layer type (Arp_packet::Hardware_type).
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*/
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Genode::uint16_t hardware_address_type() {
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return host_to_big_endian(_hw_addr_type); }
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/**
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* \return network/internet layer type (Ether_frame::EtherType).
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*/
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Genode::uint16_t protocol_address_type() {
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return host_to_big_endian(_prot_addr_type); }
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/**
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* \return size in bytes of hardware address.
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*/
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Genode::uint8_t hardware_address_size() { return _hw_addr_sz; }
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/**
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* \return size in bytes of protocol address.
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*/
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Genode::uint8_t protocol_address_size() { return _prot_addr_sz; }
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/**
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* \return operation code (Arp_packet::Opcode).
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*/
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Genode::uint16_t opcode() { return host_to_big_endian(_opcode); }
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/**
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* \return source MAC address.
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*/
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Ethernet_frame::Mac_address src_mac() {
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return Ethernet_frame::Mac_address(&_src_mac_addr); }
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/**
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* \return source IP address.
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*/
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Ipv4_packet::Ipv4_address src_ip() {
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return Ipv4_packet::Ipv4_address(&_src_ip_addr); }
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/**
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* \return destination MAC address.
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*/
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Ethernet_frame::Mac_address dst_mac() {
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return Ethernet_frame::Mac_address(&_dst_mac_addr); }
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/**
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* \return destination IP address.
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*/
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Ipv4_packet::Ipv4_address dst_ip() {
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return Ipv4_packet::Ipv4_address(&_dst_ip_addr); }
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/******************************
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** ARP field write-accessors **
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******************************/
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/**
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* Set Operation code.
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*
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* \param opcode Arp_packet::Opcode to set.
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*/
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void opcode(Genode::uint16_t opcode) {
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_opcode = host_to_big_endian(opcode); }
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/**
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* Set source MAC address.
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*
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* \param src_mac_addr MAC address to set.
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*/
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void src_mac(Ethernet_frame::Mac_address src_mac_addr) {
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src_mac_addr.copy(&_src_mac_addr); }
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/**
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* Set source IP address.
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*
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* \param src_ip_addr IP address to set.
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*/
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void src_ip(Ipv4_packet::Ipv4_address src_ip_addr) {
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src_ip_addr.copy(&_src_ip_addr); }
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/**
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* Set destination MAC address.
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*
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* \param src_mac_addr MAC address to set.
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*/
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void dst_mac(Ethernet_frame::Mac_address dst_mac_addr) {
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dst_mac_addr.copy(&_dst_mac_addr); }
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/**
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* Set destination IP address.
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*
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* \param src_ip_addr IP address to set.
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*/
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void dst_ip(Ipv4_packet::Ipv4_address dst_ip_addr) {
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dst_ip_addr.copy(&_dst_ip_addr); }
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/***************************
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** Convenience functions **
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***************************/
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/**
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* \return true when ARP packet really targets ethernet
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* address resolution with respect to IPv4 addresses.
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*/
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bool ethernet_ipv4() {
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return ( host_to_big_endian(_hw_addr_type) == ETHERNET
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&& host_to_big_endian(_prot_addr_type) == Ethernet_frame::IPV4
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&& _hw_addr_sz == Ethernet_frame::ADDR_LEN
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&& _prot_addr_sz == Ipv4_packet::ADDR_LEN);
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}
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/***************
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** Operators **
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***************/
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/**
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* Placement new
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*/
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void * operator new(Genode::size_t size, void* addr) {
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return addr; }
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} __attribute__((packed));
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#endif /* _NET__ARP_H_ */
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