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/**
* @file socket.h
*
* @brief Interface for socket_t.
*
*/
/*
* Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
* 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.
*/
#ifndef SOCKET_H_
#define SOCKET_H_
#include <types.h>
#include <network/packet.h>
/**
* @brief Maximum size of a packet.
*
* 3000 Bytes should be sufficient, see IKEv2 RFC.
*
* @ingroup network
*/
#define MAX_PACKET 3000
typedef struct socket_t socket_t;
/**
* @brief Abstraction all sockets (currently IPv4 only).
*
* All available IPv4 sockets are bound and the receive function
* reads from them. To allow binding of other daemons (pluto) to
* UDP/500, this implementation uses RAW sockets. An installed
* "Linux socket filter" filters out all non-IKEv2 traffic and handles
* just IKEv2 messages. An other daemon (pluto) must handle all traffic
* seperatly, e.g. ignore IKEv2 traffic, since charon handles that.
*
* @b Constructors:
* - socket_create()
*
* @todo add IPv6 support
*
* @todo We currently use multiple sockets for historic reasons. With the
* new RAW socket mechanism, we could use just one socket and filter
* addresses in userspace (or via linux socket filter). This would allow
* realtime interface/address management in a easy way...
*
* @ingroup network
*/
struct socket_t {
/**
* @brief Receive a packet.
*
* Reads a packet from the socket and sets source/dest
* appropriately.
*
* @param sock socket_t object to work on
* @param packet pinter gets address from allocated packet_t
* @return
* - SUCCESS when packet successfully received
* - FAILED when unable to receive
*/
status_t (*receive) (socket_t *sock, packet_t **packet);
/**
* @brief Send a packet.
*
* Sends a packet to the net using destination from the packet.
* Packet is sent using default routing mechanisms, thus the
* source address in packet is ignored.
*
* @param sock socket_t object to work on
* @param packet[out] packet_t to send
* @return
* - SUCCESS when packet successfully sent
* - FAILED when unable to send
*/
status_t (*send) (socket_t *sock, packet_t *packet);
/**
* @brief Destroy sockets.
*
* close sockets and destroy socket_t object
*
* @param sock socket_t to destroy
*/
void (*destroy) (socket_t *sock);
};
/**
* @brief Create a socket_t, wich binds multiple sockets.
*
* currently creates a raw socket and two send sockets
*
* @param port port to bind socket to
* @param natt_port port to float to in NAT-T
* @return socket_t object
*
* @ingroup network
*/
socket_t *socket_create(u_int16_t port, u_int16_t natt_port);
#endif /*SOCKET_H_*/
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