mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-25 00:11:07 +00:00
ca971bbfd8
This patch changes the top-level directory layout as a preparatory step for improving the tools for managing 3rd-party source codes. The rationale is described in the issue referenced below. Issue #1082
174 lines
4.9 KiB
C++
174 lines
4.9 KiB
C++
/*
|
|
* \brief Internet protocol version 4.
|
|
* \author Stefan Kalkowski
|
|
* \date 2010-08-19
|
|
*/
|
|
|
|
/*
|
|
* 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 _IPV4_H_
|
|
#define _IPV4_H_
|
|
|
|
/* Genode */
|
|
#include <base/exception.h>
|
|
#include <util/string.h>
|
|
|
|
#include <util/endian.h>
|
|
#include <net/netaddress.h>
|
|
|
|
namespace Net {
|
|
|
|
/**
|
|
* The data-layout of this class conforms to an IPv4 packet (RFC 791).
|
|
*
|
|
* IPv4-header-format:
|
|
*
|
|
* ----------------------------------------------------------------
|
|
* | 0-3 | 4-7 | 8-11 | 12-15 | 16-18 | 19-23 | 24-27 | 28-31 |
|
|
* ----------------------------------------------------------------
|
|
* | version | IHL | service-type | total-length |
|
|
* ----------------------------------------------------------------
|
|
* | identifikation | flags | fragment-offset |
|
|
* ----------------------------------------------------------------
|
|
* | ttl | protocol | header-checksum |
|
|
* ----------------------------------------------------------------
|
|
* | source-ip-address |
|
|
* ----------------------------------------------------------------
|
|
* | destination-ip-address |
|
|
* ----------------------------------------------------------------
|
|
* | options ... |
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
class Ipv4_packet
|
|
{
|
|
public:
|
|
|
|
enum Size {
|
|
ADDR_LEN = 4, /* Ip address length in bytes */
|
|
};
|
|
|
|
typedef Network_address<ADDR_LEN> Ipv4_address;
|
|
|
|
static const Ipv4_address CURRENT; /* current network */
|
|
static const Ipv4_address BROADCAST; /* broadcast address */
|
|
|
|
static Ipv4_address ip_from_string(const char *ip);
|
|
|
|
private:
|
|
|
|
/************************
|
|
** IPv4 header fields **
|
|
************************/
|
|
|
|
unsigned _version : 4;
|
|
unsigned _header_length : 4;
|
|
Genode::uint8_t _diff_service;
|
|
Genode::uint16_t _total_length;
|
|
Genode::uint16_t _identification;
|
|
unsigned _flags : 3;
|
|
unsigned _fragment_offset : 13;
|
|
Genode::uint8_t _time_to_live;
|
|
Genode::uint8_t _protocol;
|
|
Genode::uint16_t _header_checksum;
|
|
Genode::uint8_t _src_addr[ADDR_LEN];
|
|
Genode::uint8_t _dst_addr[ADDR_LEN];
|
|
unsigned _data[0];
|
|
|
|
/**
|
|
* Bitmasks for differentiated services field.
|
|
*/
|
|
enum Differentiated_services {
|
|
PRECEDENCE = 0x7,
|
|
DELAY = 0x8,
|
|
THROUGHPUT = 0x10,
|
|
RELIABILITY = 0x20,
|
|
COST = 0x40
|
|
};
|
|
|
|
public:
|
|
|
|
enum Precedence {
|
|
NETWORK_CONTROL = 7,
|
|
INTERNETWORK_CONTROL = 6,
|
|
CRITIC_ECP = 5,
|
|
FLASH_OVERRIDE = 4,
|
|
FLASH = 3,
|
|
IMMEDIATE = 2,
|
|
PRIORITY = 1,
|
|
ROUTINE = 0
|
|
};
|
|
|
|
enum Flags {
|
|
NO_FRAGMENT = 0x2,
|
|
MORE_FRAGMENTS = 0x4
|
|
};
|
|
|
|
|
|
/**
|
|
* Exception used to indicate protocol violation.
|
|
*/
|
|
class No_ip_packet : Genode::Exception {};
|
|
|
|
|
|
/*****************
|
|
** Constructor **
|
|
*****************/
|
|
|
|
Ipv4_packet(Genode::size_t size) {
|
|
/* ip header needs to fit in */
|
|
if (size < sizeof(Ipv4_packet))
|
|
throw No_ip_packet();
|
|
}
|
|
|
|
|
|
/*******************************
|
|
** IPv4 field read-accessors **
|
|
*******************************/
|
|
|
|
Genode::size_t version() { return _version; }
|
|
Genode::size_t header_length() { return _header_length / 4; }
|
|
Genode::uint8_t precedence() { return _diff_service & PRECEDENCE; }
|
|
|
|
bool low_delay() { return _diff_service & DELAY; }
|
|
bool high_throughput() { return _diff_service & THROUGHPUT; }
|
|
bool high_reliability() { return _diff_service & RELIABILITY;}
|
|
bool minimize_monetary_cost() { return _diff_service & COST; }
|
|
|
|
Genode::uint16_t total_length() { return bswap(_total_length); }
|
|
Genode::uint16_t identification() { return bswap(_identification); }
|
|
|
|
bool no_fragmentation() { return _flags & NO_FRAGMENT; }
|
|
bool more_fragments() { return _flags & MORE_FRAGMENTS; }
|
|
|
|
Genode::size_t fragment_offset() { return _fragment_offset; }
|
|
Genode::uint8_t time_to_live() { return _time_to_live; }
|
|
Genode::uint8_t protocol() { return _protocol; }
|
|
|
|
Genode::uint16_t checksum() { return bswap(_header_checksum); }
|
|
|
|
Ipv4_address dst() { return Ipv4_address(&_dst_addr); }
|
|
Ipv4_address src() { return Ipv4_address(&_src_addr); }
|
|
|
|
void *data() { return &_data; }
|
|
|
|
|
|
/***************
|
|
** Operators **
|
|
***************/
|
|
|
|
/**
|
|
* Placement new.
|
|
*/
|
|
void * operator new(Genode::size_t size, void* addr) {
|
|
return addr; }
|
|
|
|
} __attribute__((packed));
|
|
}
|
|
|
|
#endif /* _IPV4_H_ */
|