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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup packet packet
* @{ @ingroup networking
*/
#ifndef PACKET_H_
#define PACKET_H_
typedef struct packet_t packet_t;
#include <library.h>
#include <networking/host.h>
/**
* Maximum packet size we handle by default
*/
#define PACKET_MAX_DEFAULT 10000
/**
* Abstraction of an IP/UDP-Packet, contains data, sender and receiver.
*/
struct packet_t {
/**
* Set the source address.
*
* @param source address to set as source (gets owned)
*/
void (*set_source)(packet_t *packet, host_t *source);
/**
* Set the destination address.
*
* @param source address to set as destination (gets owned)
*/
void (*set_destination)(packet_t *packet, host_t *destination);
/**
* Get the source address.
*
* @return source address (internal data)
*/
host_t *(*get_source)(packet_t *packet);
/**
* Get the destination address.
*
* @return destination address (internal data)
*/
host_t *(*get_destination)(packet_t *packet);
/**
* Get the data from the packet.
*
* @return chunk containing the data (internal data)
*/
chunk_t (*get_data)(packet_t *packet);
/**
* Set the data in the packet.
*
* @param data chunk with data to set (gets owned)
*/
void (*set_data)(packet_t *packet, chunk_t data);
/**
* Get the DiffServ Code Point set on this packet.
*
* @return DSCP value
*/
u_int8_t (*get_dscp)(packet_t *this);
/**
* Set the DiffServ Code Point to use on this packet.
*
* @param value DSCP value
*/
void (*set_dscp)(packet_t *this, u_int8_t value);
/**
* Increase the offset where the actual packet data starts.
*
* The total offset applies to future calls of get_data() and clone().
*
* @note The offset is reset to 0 when set_data() is called.
*
* @param bytes the number of additional bytes to skip
*/
void (*skip_bytes)(packet_t *packet, size_t bytes);
/**
* Clones a packet_t object.
*
* @note Data is cloned without skipped bytes.
*
* @param clone clone of the packet
*/
packet_t* (*clone)(packet_t *packet);
/**
* Destroy the packet, freeing contained data.
*/
void (*destroy)(packet_t *packet);
};
/**
* Create an empty packet
*
* @return packet_t object
*/
packet_t *packet_create();
/**
* Create a packet from the supplied data
*
* @param src source address (gets owned)
* @param dst destination address (gets owned)
* @param data packet data (gets owned)
* @return packet_t object
*/
packet_t *packet_create_from_data(host_t *src, host_t *dst, chunk_t data);
#endif /** PACKET_H_ @}*/
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