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/*!
* \file udp_layer.hh
* \brief Header file for ITS UDP/IP protocol layer definition.
* \author ETSI STF525
* \copyright ETSI Copyright Notification
* No part may be reproduced except as authorized by written permission.
* The copyright and the foregoing restriction extend to reproduction in all media.
* All rights reserved.
* \version 0.1
*/
#pragma once
#include <arpa/inet.h>
#if !defined(LINUX)
#include <netdb.h>
struct iphdr {
#if __BYTE_ORDER == __LITTLE_ENDIAN
u_int8_t ihl:4,
version:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
u_int8_t version:4,
ihl:4;
#else
#error "Please fix <asm/byteorder.h>"
#endif
u_int8_t tos;
u_int16_t tot_len;
u_int16_t id;
u_int16_t frag_off;
u_int8_t ttl;
u_int8_t protocol;
u_int16_t check;
struct in_addr saddr;
struct in_addr daddr;
//The options start here.
};
struct udphdr {
u_int16_t source;
u_int16_t dest;
u_int16_t len;
u_int16_t check;
};
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#else // LINUX
#include <linux/ip.h>
#include <linux/udp.h>
#endif // LINUX
#include "t_layer.hh"
#include "params.hh"
/*!
* \class udp_layer
* \brief This class provides description of ITS UDP/IP protocol layer
*/
class udp_layer : public layer {
params _params; //! Layer parameters
struct iphdr* _iphdr; //! IP layer description
struct udphdr* _udphdr; //! UDP layer description
struct sockaddr_in _saddr; //! Source socket address description
struct sockaddr_in _daddr; //! Destination socket address description
/*!
* \fn unsigned short inet_check_sum(const void *buf, size_t hdr_len, const unsigned short p_initial_sum = 0);
* \brief Compute the UDP checksum
* \param[in] p_buffer The data to be sent
* \param[in] p_header_length The UDP header length
* \param [in] p_initial_sum The initial checksum value. Default: 0
* \return The checksum value
*/
unsigned short inet_check_sum(const void *p_buffer, size_t p_header_length, const unsigned short p_initial_sum = 0);
public: //! \publicsection
/*!
* \brief Specialised constructor
* Create a new instance of the udp_layer class
* \param[in] p_type \todo
* \param[in] p_param \todo
*/
udp_layer(const std::string & p_type, const std::string & p_param);
/*!
* \brief Default destructor
*/
virtual ~udp_layer() {}
/*!
* \virtual
* \fn void send_data(OCTETSTRING& data, params& params);
* \brief Send bytes formated data to the lower layers
* \param[in] p_data The data to be sent
* \param[in] p_params Some parameters to overwrite default value of the lower layers parameters
*/
virtual void send_data(OCTETSTRING& data, params& params);
/*!
* \virtual
* \fn void receive_data(OCTETSTRING& data, params& params);
* \brief Receive bytes formated data from the lower layers
* \param[in] p_data The bytes formated data received
* \param[in] p_params Some lower layers parameters values when data was received
*/
virtual void receive_data(OCTETSTRING& data, params& info);
}; // End of class udp_layer