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d0f5838c61
genode/repos/os/include/net/arp.h
Martin Stein d0f5838c61 net: clean up header fields and accessors 
Apply the style rule that an accessor is named similar to the the underlying
value. Provide read and write accessors for each mandatory header attribute.
Fix some incorrect structure in the headers like with the flags field
in Ipv4_packet.

Ref #2490
2017-10-19 13:29:43 +02:00

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/*
* \brief Address resolution protocol
* \author Stefan Kalkowski
* \date 2010-08-24
*
* ARP is used to determine a network host's link layer or
* hardware address when only its Network Layer address is known.
*/
/*
* Copyright (C) 2010-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _NET__ARP_H_
#define _NET__ARP_H_
/* Genode */
#include <base/exception.h>
#include <base/stdint.h>
#include <util/endian.h>
#include <net/ethernet.h>
#include <net/ipv4.h>
namespace Net { class Arp_packet; }
/**
* Data layout of this class conforms to an ARP-packet (RFC 826)
*
* It's reduced to Internet protocol (IPv4) over Ethernet.
*
* ARP-packet-format:
*
* --------------------------------------------------------------------
* | Bit 0-7 | Bit 8-15 | Bit 16-23 | Bit 24-31 |
* --------------------------------------------------------------------
* | hw.addr.type | prot.addr.type |
* --------------------------------------------------------------------
* | hw.addr.size | prot.addr.size | operation |
* --------------------------------------------------------------------
* | source-mac-address |
* --------------------------------------------------------------------
* | source-mac-address | source-ip-address |
* --------------------------------------------------------------------
* | source-ip-address | dest.-mac-address |
* --------------------------------------------------------------------
* | dest.-mac-address |
* --------------------------------------------------------------------
* | dest.-ip-address |
* --------------------------------------------------------------------
*/
class Net::Arp_packet
{
private:
Genode::uint16_t _hardware_address_type;
Genode::uint16_t _protocol_address_type;
Genode::uint8_t _hardware_address_size;
Genode::uint8_t _protocol_address_size;
Genode::uint16_t _opcode;
Genode::uint8_t _src_mac[Ethernet_frame::ADDR_LEN];
Genode::uint8_t _src_ip[Ipv4_packet::ADDR_LEN];
Genode::uint8_t _dst_mac[Ethernet_frame::ADDR_LEN];
Genode::uint8_t _dst_ip[Ipv4_packet::ADDR_LEN];
public:
/********************
** ARP parameters **
********************/
enum Protocol_address_type { IPV4 = 0x0800 };
enum Hardware_type {
ETHERNET = 0x0001,
EXP_ETHERNET = 0x0002,
AX_25 = 0x0003,
TOKEN_RING = 0x0004,
CHAOS = 0x0005,
IEEE802_NET = 0x0006,
ARCNET = 0x0007,
HYPERCHANNEL = 0x0008,
LANSTAR = 0x0009,
AUTONET = 0x000A,
LOCALTALK = 0x000B,
LOCALNET = 0x000C,
ULTRA_LINK = 0x000D,
SMDS = 0x000E,
FRAME_RELAY = 0x000F,
ATM_1 = 0x0010,
HDLC = 0x0011,
FIBRE_CHANNEL = 0x0012,
ATM_2 = 0x0013,
SERIAL_LINE = 0x0014,
ATM_3 = 0x0015,
MIL_STD_188_220 = 0x0016,
METRICOM = 0x0017,
IEEE1394 = 0x0018,
MAPOS = 0x0019,
TWINAXIAL = 0x001A,
EUI_64 = 0x001B,
HIPARP = 0x001C,
IP_AND_ARP_OVER_ISO7816 = 0x001D,
ARPSEC = 0x001E,
IPSEC_TUNNEL = 0x001F,
INFINIBAND = 0x0020,
TIA_102 = 0x0021,
WIEGAND_INTERFACE = 0x0022,
Pure_IP = 0x0023,
HW_EXP1 = 0x0024,
HFI = 0x0025,
HW_EXP2 = 0x0100,
};
enum Opcode {
REQUEST = 0x0001,
REPLY = 0x0002,
REQUEST_REVERSE = 0x0003,
REPLY_REVERSE = 0x0004,
DRARP_REQUEST = 0x0005,
DRARP_REPLY = 0x0006,
DRARP_ERROR = 0x0007,
INARP_REQUEST = 0x0008,
INARP_REPLY = 0x0009,
ARP_NAK = 0x000A,
MARS_REQUEST = 0x000B,
MARS_MULTI = 0x000C,
MARS_MSERV = 0x000D,
MARS_JOIN = 0x000E,
MARS_LEAVE = 0x000F,
MARS_NAK = 0x0010,
MARS_UNSERV = 0x0011,
MARS_SJOIN = 0x0012,
MARS_SLEAVE = 0x0013,
MARS_GROUPLIST_REQUEST = 0x0014,
MARS_GROUPLIST_REPLY = 0x0015,
MARS_REDIRECT_MAP = 0x0016,
MAPOS_UNARP = 0x0017,
OP_EXP1 = 0x0018,
OP_EXP2 = 0x0019
};
/**
* Exception used to indicate protocol violation.
*/
class No_arp_packet : Genode::Exception {};
/*****************
** Constructor **
*****************/
Arp_packet(Genode::size_t size) {
/* arp packet needs to fit in */
if (size < sizeof(Arp_packet))
throw No_arp_packet();
}
/***************
** Accessors **
***************/
Genode::uint16_t hardware_address_type() const { return host_to_big_endian(_hardware_address_type); }
Genode::uint16_t protocol_address_type() const { return host_to_big_endian(_protocol_address_type); }
Genode::uint8_t hardware_address_size() const { return _hardware_address_size; }
Genode::uint8_t protocol_address_size() const { return _protocol_address_size; }
Genode::uint16_t opcode() const { return host_to_big_endian(_opcode); }
Mac_address src_mac() const { return Mac_address((void *)&_src_mac); }
Ipv4_address src_ip() const { return Ipv4_address((void *)&_src_ip); }
Mac_address dst_mac() const { return Mac_address((void *)&_dst_mac); }
Ipv4_address dst_ip() const { return Ipv4_address((void *)&_dst_ip); }
void hardware_address_type(Genode::uint16_t v) { _hardware_address_type = host_to_big_endian(v); }
void protocol_address_type(Genode::uint16_t v) { _protocol_address_type = host_to_big_endian(v); }
void hardware_address_size(Genode::uint8_t v) { _hardware_address_size = v; }
void protocol_address_size(Genode::uint8_t v) { _protocol_address_size = v; }
void opcode(Genode::uint16_t v) { _opcode = host_to_big_endian(v); }
void src_mac(Mac_address v) { v.copy(&_src_mac); }
void src_ip(Ipv4_address v) { v.copy(&_src_ip); }
void dst_mac(Mac_address v) { v.copy(&_dst_mac); }
void dst_ip(Ipv4_address v) { v.copy(&_dst_ip); }
/***************************
** Convenience functions **
***************************/
/**
* \return true when ARP packet really targets ethernet
* address resolution with respect to IPv4 addresses.
*/
bool ethernet_ipv4() const {
return ( host_to_big_endian(_hardware_address_type) == ETHERNET
&& host_to_big_endian(_protocol_address_type) == (Genode::uint16_t)Ethernet_frame::Type::IPV4
&& _hardware_address_size == Ethernet_frame::ADDR_LEN
&& _protocol_address_size == Ipv4_packet::ADDR_LEN);
}
/***************
** Operators **
***************/
/**
* Placement new
*/
void * operator new(__SIZE_TYPE__ size, void* addr) { return addr; }
/*********
** Log **
*********/
void print(Genode::Output &output) const;
} __attribute__((packed));
#endif /* _NET__ARP_H_ */
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