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genode/repos/os/include/net/udp.h

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Imported Genode release 11.11
2011-12-22 15:19:25 +00:00
/*
* \brief User datagram protocol.
* \author Stefan Kalkowski
* \date 2010-08-19
*/
/*
Adjust file headers to refer to the AGPLv3
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* Copyright (C) 2010-2017 Genode Labs GmbH
Imported Genode release 11.11
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*
* This file is part of the Genode OS framework, which is distributed
Adjust file headers to refer to the AGPLv3
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* under the terms of the GNU Affero General Public License version 3.
Imported Genode release 11.11
2011-12-22 15:19:25 +00:00
*/
#ifndef _UDP_H_
#define _UDP_H_
/* Genode */
#include <base/exception.h>
#include <base/stdint.h>
net: introduce and apply Net::Port type Thereby fix bug in the NIC router that previously used uint8_t values for ports in some places. Ref #2193
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#include <net/port.h>
Imported Genode release 11.11
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#include <util/endian.h>
#include <net/ethernet.h>
#include <net/ipv4.h>
base,os: Coding-style unification Fixes #1432
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namespace Net { class Udp_packet; }
Imported Genode release 11.11
2011-12-22 15:19:25 +00:00
base,os: Coding-style unification Fixes #1432
2015-03-04 20:12:14 +00:00
/**
* Data layout of this class conforms to an UDP packet (RFC 768)
*
* UDP-header-format:
*
* -----------------------------------------------------------------------
* | source-port | destination-port | length | checksum |
* | 2 bytes | 2 bytes | 2 bytes | 2 bytes |
* -----------------------------------------------------------------------
*/
class Net::Udp_packet
{
private:
/***********************
** UDP header fields **
***********************/
Genode::uint16_t _src_port;
Genode::uint16_t _dst_port;
Genode::uint16_t _length;
Genode::uint16_t _checksum;
unsigned _data[0];
public:
net: check packet data size in accessor Instead of having a method validate_size in each packet class, check sizes in the data accessor of the surrounding packet class. This packet accessor is the one that casts the data pointer to the desired data type so it is sensible that it also checks whether the desired type would exceed the available RAM before doing the cast. This also fits nicely the fact that for the top-level packet-class of a packet, the size must not be checked (which was previously done). Issue #465
2018-01-08 13:11:29 +00:00
struct Bad_data_type : Genode::Exception { };
net: safer access to packet data Replace packet method 'T *data' by the new methods 'T &reinterpret_data' for parsing or modifying existing sub-protocol packets and 'T &construct_at_data' for composing a new sub-protocol packet. This has the advantage that, when composing a new packet, the default constructor that zero-fills the packet is always called first. Fixes #2751
2018-04-09 17:58:08 +00:00
template <typename T> T const &data(Genode::size_t data_size) const
net: check packet data size in accessor Instead of having a method validate_size in each packet class, check sizes in the data accessor of the surrounding packet class. This packet accessor is the one that casts the data pointer to the desired data type so it is sensible that it also checks whether the desired type would exceed the available RAM before doing the cast. This also fits nicely the fact that for the top-level packet-class of a packet, the size must not be checked (which was previously done). Issue #465
2018-01-08 13:11:29 +00:00
{
if (data_size < sizeof(T)) {
throw Bad_data_type();
}
net: safer access to packet data Replace packet method 'T *data' by the new methods 'T &reinterpret_data' for parsing or modifying existing sub-protocol packets and 'T &construct_at_data' for composing a new sub-protocol packet. This has the advantage that, when composing a new packet, the default constructor that zero-fills the packet is always called first. Fixes #2751
2018-04-09 17:58:08 +00:00
return *(T const *)(_data);
net: check packet data size in accessor Instead of having a method validate_size in each packet class, check sizes in the data accessor of the surrounding packet class. This packet accessor is the one that casts the data pointer to the desired data type so it is sensible that it also checks whether the desired type would exceed the available RAM before doing the cast. This also fits nicely the fact that for the top-level packet-class of a packet, the size must not be checked (which was previously done). Issue #465
2018-01-08 13:11:29 +00:00
}
net: safer access to packet data Replace packet method 'T *data' by the new methods 'T &reinterpret_data' for parsing or modifying existing sub-protocol packets and 'T &construct_at_data' for composing a new sub-protocol packet. This has the advantage that, when composing a new packet, the default constructor that zero-fills the packet is always called first. Fixes #2751
2018-04-09 17:58:08 +00:00
template <typename T> T &data(Genode::size_t data_size)
net: check packet data size in accessor Instead of having a method validate_size in each packet class, check sizes in the data accessor of the surrounding packet class. This packet accessor is the one that casts the data pointer to the desired data type so it is sensible that it also checks whether the desired type would exceed the available RAM before doing the cast. This also fits nicely the fact that for the top-level packet-class of a packet, the size must not be checked (which was previously done). Issue #465
2018-01-08 13:11:29 +00:00
{
if (data_size < sizeof(T)) {
throw Bad_data_type();
}
net: safer access to packet data Replace packet method 'T *data' by the new methods 'T &reinterpret_data' for parsing or modifying existing sub-protocol packets and 'T &construct_at_data' for composing a new sub-protocol packet. This has the advantage that, when composing a new packet, the default constructor that zero-fills the packet is always called first. Fixes #2751
2018-04-09 17:58:08 +00:00
return *(T *)(_data);
}
template <typename T, typename SIZE_GUARD>
T &construct_at_data(SIZE_GUARD &size_guard)
{
size_guard.add(sizeof(T));
return *Genode::construct_at<T>(_data);
base,os: Coding-style unification Fixes #1432
2015-03-04 20:12:14 +00:00
}
net: use generic internet checksum This reduces the redundant implementations of checksum calculation to one generic implementation, makes the checksum interface conform over all protocols, and brings performance optimizations. For instance, the checksum is now calculated directly in big endian which saves us most of the previously done byte-re-ordering. Issue #2775
2018-04-16 22:35:16 +00:00
void update_checksum(Ipv4_address ip_src,
Ipv4_address ip_dst);
net: implement Udp_packet::checksum_error For checking the checksum of a UDP packet. Issue #2775
2018-04-18 13:29:58 +00:00
bool checksum_error(Ipv4_address ip_src,
Ipv4_address ip_dst) const;
base,os: Coding-style unification Fixes #1432
2015-03-04 20:12:14 +00:00
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
2017-09-14 13:10:32 +00:00
/***************
** Accessors **
***************/
net: transform packet data accessor into template Supports stronger typing of raw accesses and const correctness. Issue #1915
2016-05-09 13:47:28 +00:00
net: check packet data size in accessor Instead of having a method validate_size in each packet class, check sizes in the data accessor of the surrounding packet class. This packet accessor is the one that casts the data pointer to the desired data type so it is sensible that it also checks whether the desired type would exceed the available RAM before doing the cast. This also fits nicely the fact that for the top-level packet-class of a packet, the size must not be checked (which was previously done). Issue #465
2018-01-08 13:11:29 +00:00
Port src_port() const { return Port(host_to_big_endian(_src_port)); }
Port dst_port() const { return Port(host_to_big_endian(_dst_port)); }
Genode::uint16_t length() const { return host_to_big_endian(_length); }
Genode::uint16_t checksum() const { return host_to_big_endian(_checksum); }
net: address operator != and some UDP accessors
2016-08-25 15:48:06 +00:00
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
2017-09-14 13:10:32 +00:00
void length(Genode::uint16_t v) { _length = host_to_big_endian(v); }
void src_port(Port p) { _src_port = host_to_big_endian(p.value); }
void dst_port(Port p) { _dst_port = host_to_big_endian(p.value); }
base,os: Coding-style unification Fixes #1432
2015-03-04 20:12:14 +00:00
net: replace dump.h by modern print methods Ref #2139
2016-11-02 00:00:59 +00:00
/*********
** log **
*********/
void print(Genode::Output &output) const;
base,os: Coding-style unification Fixes #1432
2015-03-04 20:12:14 +00:00
} __attribute__((packed));
Imported Genode release 11.11
2011-12-22 15:19:25 +00:00
#endif /* _UDP_H_ */
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