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980f3e9c5c
Instead of handing over the maximum available size to the packet data accessors, hand over a size guard that keeps track of the packets boundaries. This commit also moves the size-guard utilitiy header of Ping and NIC Router to the include/net directory making it a part of the net library. It applies the new approach to all net-lib users in the basic repositories. Ping looses its configurability regarding the ICMP data size as this would require an additional method in the size guard which would be used only by Ping. The size guard was also re-worked to fit the fact that a packet can bring a tail as well as a header (Ethernet). Issue #2788
141 lines
5.0 KiB
C++
141 lines
5.0 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) 2010-2017 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__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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Genode::uint16_t _hardware_address_type;
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Genode::uint16_t _protocol_address_type;
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Genode::uint8_t _hardware_address_size;
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Genode::uint8_t _protocol_address_size;
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Genode::uint16_t _opcode;
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Genode::uint8_t _src_mac[Ethernet_frame::ADDR_LEN];
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Genode::uint8_t _src_ip[Ipv4_packet::ADDR_LEN];
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Genode::uint8_t _dst_mac[Ethernet_frame::ADDR_LEN];
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Genode::uint8_t _dst_ip[Ipv4_packet::ADDR_LEN];
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public:
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enum Protocol_address_type {
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IPV4 = 0x0800,
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};
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enum Hardware_type {
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ETHERNET = 0x0001,
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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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};
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/***************
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** Accessors **
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***************/
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Genode::uint16_t hardware_address_type() const { return host_to_big_endian(_hardware_address_type); }
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Genode::uint16_t protocol_address_type() const { return host_to_big_endian(_protocol_address_type); }
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Genode::uint8_t hardware_address_size() const { return _hardware_address_size; }
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Genode::uint8_t protocol_address_size() const { return _protocol_address_size; }
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Genode::uint16_t opcode() const { return host_to_big_endian(_opcode); }
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Mac_address src_mac() const { return Mac_address((void *)&_src_mac); }
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Ipv4_address src_ip() const { return Ipv4_address((void *)&_src_ip); }
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Mac_address dst_mac() const { return Mac_address((void *)&_dst_mac); }
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Ipv4_address dst_ip() const { return Ipv4_address((void *)&_dst_ip); }
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void hardware_address_type(Genode::uint16_t v) { _hardware_address_type = host_to_big_endian(v); }
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void protocol_address_type(Genode::uint16_t v) { _protocol_address_type = host_to_big_endian(v); }
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void hardware_address_size(Genode::uint8_t v) { _hardware_address_size = v; }
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void protocol_address_size(Genode::uint8_t v) { _protocol_address_size = v; }
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void opcode(Genode::uint16_t v) { _opcode = host_to_big_endian(v); }
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void src_mac(Mac_address v) { v.copy(&_src_mac); }
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void src_ip(Ipv4_address v) { v.copy(&_src_ip); }
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void dst_mac(Mac_address v) { v.copy(&_dst_mac); }
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void dst_ip(Ipv4_address v) { v.copy(&_dst_ip); }
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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() const {
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return ( host_to_big_endian(_hardware_address_type) == ETHERNET
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&& host_to_big_endian(_protocol_address_type) == (Genode::uint16_t)Ethernet_frame::Type::IPV4
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&& _hardware_address_size == Ethernet_frame::ADDR_LEN
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&& _protocol_address_size == Ipv4_packet::ADDR_LEN);
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}
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Genode::size_t size(Genode::size_t max_size) const
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{
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return sizeof(Arp_packet) < max_size ? sizeof(Arp_packet) : max_size;
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}
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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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#endif /* _NET__ARP_H_ */
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