mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-30 18:47:01 +00:00
2eb8c5e21a
The combination of Net::Mac_address and Genode::ascii_to(Net::Mac_address) required shaky quirks in several places because GCC is not able to resolve the ascii_to overload if base/xml_node.h was included to early. The current solution moves the several ascii_to overloads "closer" to the Net types by putting them into the Net namespace, where GCC reliably picks them up. Hence, co-locating the ascii_to() utility with the overload type in the same scope/namespace is good practice. This patch removes the now obsolete <nic/xml_node.h> header file.
228 lines
6.8 KiB
C++
228 lines
6.8 KiB
C++
/*
|
|
* \brief Internet protocol version 4.
|
|
* \author Stefan Kalkowski
|
|
* \date 2010-08-19
|
|
*/
|
|
|
|
/*
|
|
* 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 _IPV4_H_
|
|
#define _IPV4_H_
|
|
|
|
/* Genode */
|
|
#include <base/exception.h>
|
|
#include <util/string.h>
|
|
#include <util/token.h>
|
|
#include <util/construct_at.h>
|
|
#include <util/endian.h>
|
|
#include <net/netaddress.h>
|
|
#include <net/size_guard.h>
|
|
|
|
namespace Genode { class Output; }
|
|
|
|
namespace Net {
|
|
enum { IPV4_ADDR_LEN = 4 };
|
|
|
|
class Ipv4_address;
|
|
class Ipv4_packet;
|
|
|
|
static inline Genode::size_t ascii_to(char const *, Net::Ipv4_address &);
|
|
}
|
|
|
|
|
|
struct Net::Ipv4_address : Network_address<IPV4_ADDR_LEN, '.', false>
|
|
{
|
|
Ipv4_address(Genode::uint8_t value = 0) : Network_address(value) { }
|
|
|
|
Ipv4_address(void *src) : Network_address(src) { }
|
|
|
|
bool valid() const { return *this != Ipv4_address(); }
|
|
|
|
Genode::uint32_t to_uint32_big_endian() const;
|
|
|
|
static Ipv4_address from_uint32_big_endian(Genode::uint32_t ip_raw);
|
|
|
|
Genode::uint32_t to_uint32_little_endian() const;
|
|
|
|
static Ipv4_address from_uint32_little_endian(Genode::uint32_t ip_raw);
|
|
|
|
bool is_in_range(Ipv4_address const &first,
|
|
Ipv4_address const &last) const;
|
|
}
|
|
__attribute__((packed));
|
|
|
|
|
|
/**
|
|
* 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 Net::Ipv4_packet
|
|
{
|
|
public:
|
|
|
|
enum Size {
|
|
ADDR_LEN = IPV4_ADDR_LEN, /* Ip address length in bytes */
|
|
};
|
|
|
|
static Ipv4_address current() { return Ipv4_address((Genode::uint8_t)0x00); }
|
|
static Ipv4_address broadcast() { return Ipv4_address((Genode::uint8_t)0xff); }
|
|
|
|
static Ipv4_address ip_from_string(const char *ip);
|
|
|
|
void update_checksum();
|
|
|
|
bool checksum_error() const;
|
|
|
|
private:
|
|
|
|
/************************
|
|
** IPv4 header fields **
|
|
************************/
|
|
|
|
unsigned _header_length : 4;
|
|
unsigned _version : 4;
|
|
unsigned _diff_service : 6;
|
|
unsigned _ecn : 2;
|
|
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 _checksum;
|
|
Genode::uint8_t _src[ADDR_LEN];
|
|
Genode::uint8_t _dst[ADDR_LEN];
|
|
unsigned _data[0];
|
|
|
|
public:
|
|
|
|
enum class Protocol : Genode::uint8_t
|
|
{
|
|
ICMP = 1,
|
|
TCP = 6,
|
|
UDP = 17,
|
|
};
|
|
|
|
template <typename T>
|
|
T const &data(Size_guard &size_guard) const
|
|
{
|
|
size_guard.consume_head(sizeof(T));
|
|
return *(T const *)(_data);
|
|
}
|
|
|
|
template <typename T>
|
|
T &data(Size_guard &size_guard)
|
|
{
|
|
size_guard.consume_head(sizeof(T));
|
|
return *(T *)(_data);
|
|
}
|
|
|
|
template <typename T, typename SIZE_GUARD>
|
|
T &construct_at_data(SIZE_GUARD &size_guard)
|
|
{
|
|
size_guard.consume_head(sizeof(T));
|
|
return *Genode::construct_at<T>(_data);
|
|
}
|
|
|
|
Genode::size_t size(Genode::size_t max_size) const;
|
|
|
|
|
|
/***************
|
|
** Accessors **
|
|
***************/
|
|
|
|
Genode::size_t header_length() const { return _header_length; }
|
|
Genode::uint8_t version() const { return _version; }
|
|
Genode::uint8_t diff_service() const { return _diff_service; }
|
|
Genode::uint8_t ecn() const { return _ecn; }
|
|
Genode::size_t total_length() const { return host_to_big_endian(_total_length); }
|
|
Genode::uint16_t identification() const { return host_to_big_endian(_identification); }
|
|
Genode::uint8_t flags() const { return _flags; }
|
|
Genode::size_t fragment_offset() const { return _fragment_offset; }
|
|
Genode::uint8_t time_to_live() const { return _time_to_live; }
|
|
Protocol protocol() const { return (Protocol)_protocol; }
|
|
Genode::uint16_t checksum() const { return host_to_big_endian(_checksum); }
|
|
Ipv4_address src() const { return Ipv4_address((void *)&_src); }
|
|
Ipv4_address dst() const { return Ipv4_address((void *)&_dst); }
|
|
|
|
void header_length(Genode::size_t v) { _header_length = v; }
|
|
void version(Genode::uint8_t v) { _version = v; }
|
|
void diff_service(Genode::uint8_t v) { _diff_service = v; ; }
|
|
void ecn(Genode::uint8_t v) { _ecn = v; ; }
|
|
void total_length(Genode::size_t v) { _total_length = host_to_big_endian((Genode::uint16_t)v); }
|
|
void identification(Genode::uint16_t v) { _identification = host_to_big_endian(v); }
|
|
void flags(Genode::uint8_t v) { _flags = v; ; }
|
|
void fragment_offset(Genode::size_t v) { _fragment_offset = v; ; }
|
|
void time_to_live(Genode::uint8_t v) { _time_to_live = v; }
|
|
void protocol(Protocol v) { _protocol = (Genode::uint8_t)v; }
|
|
void checksum(Genode::uint16_t checksum) { _checksum = host_to_big_endian(checksum); }
|
|
void src(Ipv4_address v) { v.copy(&_src); }
|
|
void dst(Ipv4_address v) { v.copy(&_dst); }
|
|
|
|
|
|
/*********
|
|
** log **
|
|
*********/
|
|
|
|
void print(Genode::Output &output) const;
|
|
|
|
} __attribute__((packed));
|
|
|
|
|
|
Genode::size_t Net::ascii_to(char const *s, Net::Ipv4_address &result)
|
|
{
|
|
using namespace Genode;
|
|
|
|
Net::Ipv4_address buf;
|
|
size_t number_idx = 0;
|
|
size_t read_len = 0;
|
|
|
|
while (1) {
|
|
|
|
/* read the current number, fail if there's no number */
|
|
size_t number_len = ascii_to_unsigned(s, buf.addr[number_idx], 10);
|
|
if (!number_len) {
|
|
return 0; }
|
|
|
|
/* update read length and number index */
|
|
read_len += number_len;
|
|
number_idx++;
|
|
|
|
/* if we have all numbers, fill result and return read length */
|
|
if (number_idx == sizeof(buf.addr) / sizeof(buf.addr[0])) {
|
|
result = buf;
|
|
return read_len;
|
|
}
|
|
/* as it was not the last number, check for the following dot */
|
|
s += number_len;
|
|
if (*s != '.') {
|
|
return 0; }
|
|
read_len++;
|
|
s++;
|
|
}
|
|
}
|
|
|
|
#endif /* _IPV4_H_ */
|