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/*
This file is part of GNUnet.
(C) 2012 Christian Grothoff
GNUnet 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 3, or (at your
option) any later version.
GNUnet 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.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file exit/exit.h
* @brief format for mesh messages exchanged between VPN service and exit daemon
* @author Christian Grothoff
*/
#ifndef EXIT_H
#define EXIT_H
#include "gnunet_util_lib.h"
/**
* Message send via mesh to an exit daemon to initiate forwarding of
* TCP data to a local service.
*/
struct GNUNET_EXIT_TcpServiceStartMessage
{
/**
* Type is GNUNET_MESSAGE_TYPE_VPN_TCP_TO_SERVICE_START
*/
struct GNUNET_MessageHeader header;
/**
* Always 0.
*/
uint32_t reserved;
/**
* Identification for the desired service.
*/
GNUNET_HashCode service_descriptor;
/**
* Skeleton of the TCP header to send. Port numbers are to
* be replaced and the checksum may be updated as necessary.
*/
struct GNUNET_TUN_TcpHeader tcp_header;
/* followed by TCP payload */
};
/**
* Message send via mesh to an exit daemon to initiate forwarding of
* TCP data to the Internet.
*/
struct GNUNET_EXIT_TcpInternetStartMessage
{
/**
* Type is GNUNET_MESSAGE_TYPE_VPN_TCP_TO_INTERNET_START
*/
struct GNUNET_MessageHeader header;
/**
* Address family, AF_INET or AF_INET6, in network byte order.
*/
int32_t af;
/**
* Skeleton of the TCP header to send. Port numbers are to
* be replaced and the checksum may be updated as necessary.
*/
struct GNUNET_TUN_TcpHeader tcp_header;
/* followed by IP address of the destination; either
'struct in_addr' or 'struct in6_addr', depending on af */
/* followed by TCP payload */
};
/**
* Message send via mesh between VPN and entry and an exit daemon to
* transmit TCP data between the VPN entry and an exit session. This
* format is used for both Internet-exits and service-exits and
* in both directions (VPN to exit and exit to VPN).
*/
struct GNUNET_EXIT_TcpDataMessage
{
/**
* Type is GNUNET_MESSAGE_TYPE_VPN_TCP_DATA
*/
struct GNUNET_MessageHeader header;
/**
* Always 0.
*/
uint32_t reserved;
/**
* Skeleton of the TCP header to send. Port numbers are to
* be replaced and the checksum may be updated as necessary. (The destination port number should not be changed, as it contains the desired destination port.)
*/
struct GNUNET_TUN_TcpHeader tcp_header;
/* followed by TCP payload */
};
/**
* Message send via mesh to an exit daemon to send
* UDP data to a local service.
*/
struct GNUNET_EXIT_UdpServiceMessage
{
/**
* Type is GNUNET_MESSAGE_TYPE_VPN_UDP_TO_SERVICE
*/
struct GNUNET_MessageHeader header;
/**
* Source port to use for the UDP request (0 to use a random port). In NBO.
*/
uint16_t source_port;
/**
* Destination port to use for the UDP request. In NBO.
*/
uint16_t destination_port;
/**
* Identification for the desired service.
*/
GNUNET_HashCode service_descriptor;
/* followed by UDP payload */
};
/**
* Message send via mesh to an exit daemon to forward
* UDP data to the Internet.
*/
struct GNUNET_EXIT_UdpInternetMessage
{
/**
* Type is GNUNET_MESSAGE_TYPE_VPN_UDP_TO_INTERNET
*/
struct GNUNET_MessageHeader header;
/**
* Address family, AF_INET or AF_INET6, in network byte order.
*/
int32_t af;
/**
* Source port to use for the UDP request (0 to use a random port). In NBO.
*/
uint16_t source_port;
/**
* Destination port to use for the UDP request. In NBO.
*/
uint16_t destination_port;
/* followed by IP address of the destination; either
'struct in_addr' or 'struct in6_addr', depending on af */
/* followed by UDP payload */
};
/**
* Message send from exit daemon back to the UDP entry point
* (used for both Internet and Service exit replies).
*/
struct GNUNET_EXIT_UdpReplyMessage
{
/**
* Type is GNUNET_MESSAGE_TYPE_VPN_UDP_REPLY
*/
struct GNUNET_MessageHeader header;
/**
* Source port to use for the UDP reply (0 to use the same
* port as for the original request). In NBO.
*/
uint16_t source_port;
/**
* Destination port to use for the UDP reply (0 to use the same
* port as for the original request). In NBO.
*/
uint16_t destination_port;
/* followed by UDP payload */
};
#endif
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