mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-20 14:13:09 +00:00
295 lines
8.4 KiB
C++
295 lines
8.4 KiB
C++
/*
|
|
* \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) 2010-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#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 {
|
|
|
|
/**
|
|
* The 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 Arp_packet
|
|
{
|
|
private:
|
|
|
|
/***********************
|
|
** ARP header fields **
|
|
***********************/
|
|
|
|
Genode::uint16_t _hw_addr_type;
|
|
Genode::uint16_t _prot_addr_type;
|
|
Genode::uint8_t _hw_addr_sz;
|
|
Genode::uint8_t _prot_addr_sz;
|
|
Genode::uint16_t _opcode;
|
|
Genode::uint8_t _src_mac_addr[Ethernet_frame::ADDR_LEN];
|
|
Genode::uint8_t _src_ip_addr[Ipv4_packet::ADDR_LEN];
|
|
Genode::uint8_t _dst_mac_addr[Ethernet_frame::ADDR_LEN];
|
|
Genode::uint8_t _dst_ip_addr[Ipv4_packet::ADDR_LEN];
|
|
|
|
public:
|
|
|
|
/********************
|
|
** ARP parameters **
|
|
********************/
|
|
|
|
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();
|
|
}
|
|
|
|
|
|
/******************************
|
|
** ARP field read-accessors **
|
|
******************************/
|
|
|
|
/**
|
|
* \return link layer type (Arp_packet::Hardware_type).
|
|
*/
|
|
Genode::uint16_t hardware_address_type() {
|
|
return bswap(_hw_addr_type); }
|
|
|
|
/**
|
|
* \return network/internet layer type (Ether_frame::EtherType).
|
|
*/
|
|
Genode::uint16_t protocol_address_type() {
|
|
return bswap(_prot_addr_type); }
|
|
|
|
/**
|
|
* \return size in bytes of hardware address.
|
|
*/
|
|
Genode::uint8_t hardware_address_size() { return _hw_addr_sz; }
|
|
|
|
/**
|
|
* \return size in bytes of protocol address.
|
|
*/
|
|
Genode::uint8_t protocol_address_size() { return _prot_addr_sz; }
|
|
|
|
/**
|
|
* \return operation code (Arp_packet::Opcode).
|
|
*/
|
|
Genode::uint16_t opcode() { return bswap(_opcode); }
|
|
|
|
/**
|
|
* \return source MAC address.
|
|
*/
|
|
Ethernet_frame::Mac_address src_mac() {
|
|
return Ethernet_frame::Mac_address(&_src_mac_addr); }
|
|
|
|
/**
|
|
* \return source IP address.
|
|
*/
|
|
Ipv4_packet::Ipv4_address src_ip() {
|
|
return Ipv4_packet::Ipv4_address(&_src_ip_addr); }
|
|
|
|
/**
|
|
* \return destination MAC address.
|
|
*/
|
|
Ethernet_frame::Mac_address dst_mac() {
|
|
return Ethernet_frame::Mac_address(&_dst_mac_addr); }
|
|
|
|
/**
|
|
* \return destination IP address.
|
|
*/
|
|
Ipv4_packet::Ipv4_address dst_ip() {
|
|
return Ipv4_packet::Ipv4_address(&_dst_ip_addr); }
|
|
|
|
|
|
/******************************
|
|
** ARP field write-accessors **
|
|
******************************/
|
|
|
|
/**
|
|
* Set Operation code.
|
|
*
|
|
* \param opcode Arp_packet::Opcode to set.
|
|
*/
|
|
void opcode(Genode::uint16_t opcode) {
|
|
_opcode = bswap(opcode); }
|
|
|
|
/**
|
|
* Set source MAC address.
|
|
*
|
|
* \param src_mac_addr MAC address to set.
|
|
*/
|
|
void src_mac(Ethernet_frame::Mac_address src_mac_addr) {
|
|
src_mac_addr.copy(&_src_mac_addr); }
|
|
|
|
/**
|
|
* Set source IP address.
|
|
*
|
|
* \param src_ip_addr IP address to set.
|
|
*/
|
|
void src_ip(Ipv4_packet::Ipv4_address src_ip_addr) {
|
|
src_ip_addr.copy(&_src_ip_addr); }
|
|
|
|
/**
|
|
* Set destination MAC address.
|
|
*
|
|
* \param src_mac_addr MAC address to set.
|
|
*/
|
|
void dst_mac(Ethernet_frame::Mac_address dst_mac_addr) {
|
|
dst_mac_addr.copy(&_dst_mac_addr); }
|
|
|
|
/**
|
|
* Set destination IP address.
|
|
*
|
|
* \param src_ip_addr IP address to set.
|
|
*/
|
|
void dst_ip(Ipv4_packet::Ipv4_address dst_ip_addr) {
|
|
dst_ip_addr.copy(&_dst_ip_addr); }
|
|
|
|
|
|
/***************************
|
|
** convenience functions **
|
|
***************************/
|
|
|
|
/**
|
|
* \return true when ARP packet really targets ethernet
|
|
* address resolution with respect to IPv4 addresses.
|
|
*/
|
|
bool ethernet_ipv4() {
|
|
return ( bswap(_hw_addr_type) == ETHERNET
|
|
&& bswap(_prot_addr_type) == Ethernet_frame::IPV4
|
|
&& _hw_addr_sz == Ethernet_frame::ADDR_LEN
|
|
&& _prot_addr_sz == Ipv4_packet::ADDR_LEN);
|
|
}
|
|
|
|
|
|
/***************
|
|
** Operators **
|
|
***************/
|
|
|
|
/**
|
|
* Placement new
|
|
*/
|
|
void * operator new(Genode::size_t size, void* addr) {
|
|
return addr; }
|
|
} __attribute__((packed));
|
|
}
|
|
|
|
#endif /* _NET__ARP_H_ */
|