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/*
This file is part of GNUnet.
(C) 2010, 2011, 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 include/gnunet_tun_lib.h
* @brief standard TCP/IP network structs and IP checksum calculations for TUN interaction
* @author Philipp Toelke
* @author Christian Grothoff
*/
#ifndef GNUNET_TUN_LIB_H
#define GNUNET_TUN_LIB_H
#include "gnunet_util_lib.h"
/* see http://www.iana.org/assignments/ethernet-numbers */
#ifndef ETH_P_IPV4
/**
* Number for IPv4
*/
#define ETH_P_IPV4 0x0800
#endif
#ifndef ETH_P_IPV6
/**
* Number for IPv6
*/
#define ETH_P_IPV6 0x86DD
#endif
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Header from Linux TUN interface.
*/
struct GNUNET_TUN_Layer2PacketHeader
{
/**
* Some flags (unused).
*/
uint16_t flags;
/**
* Here we get an ETH_P_-number.
*/
uint16_t proto;
};
/**
* Standard IPv4 header.
*/
struct GNUNET_TUN_IPv4Header
{
unsigned header_length:4 GNUNET_PACKED;
unsigned version:4 GNUNET_PACKED;
uint8_t diff_serv;
uint16_t total_length GNUNET_PACKED;
uint16_t identification GNUNET_PACKED;
unsigned flags:3 GNUNET_PACKED;
unsigned fragmentation_offset:13 GNUNET_PACKED;
uint8_t ttl;
uint8_t protocol;
uint16_t checksum GNUNET_PACKED;
struct in_addr source_address GNUNET_PACKED;
struct in_addr destination_address GNUNET_PACKED;
};
/**
* Standard IPv6 header.
*/
struct GNUNET_TUN_IPv6Header
{
unsigned traffic_class_h:4 GNUNET_PACKED;
unsigned version:4 GNUNET_PACKED;
unsigned traffic_class_l:4 GNUNET_PACKED;
unsigned flow_label:20 GNUNET_PACKED;
uint16_t payload_length GNUNET_PACKED;
uint8_t next_header;
uint8_t hop_limit;
struct in6_addr source_address GNUNET_PACKED;
struct in6_addr destination_address GNUNET_PACKED;
};
/**
* TCP packet header (FIXME: rename!)
*/
struct GNUNET_TUN_TcpHeader
{
unsigned spt:16 GNUNET_PACKED;
unsigned dpt:16 GNUNET_PACKED;
unsigned seq:32 GNUNET_PACKED;
unsigned ack:32 GNUNET_PACKED;
unsigned off:4 GNUNET_PACKED;
unsigned rsv:4 GNUNET_PACKED;
unsigned flg:8 GNUNET_PACKED;
unsigned wsz:16 GNUNET_PACKED;
unsigned crc:16 GNUNET_PACKED;
unsigned urg:16 GNUNET_PACKED;
};
/**
* UDP packet header (FIXME: rename!)
*/
struct GNUNET_TUN_UdpHeader
{
uint16_t spt GNUNET_PACKED;
uint16_t dpt GNUNET_PACKED;
uint16_t len GNUNET_PACKED;
uint16_t crc GNUNET_PACKED;
};
/**
* DNS header.
*/
struct GNUNET_TUN_DnsHeader
{
uint16_t id GNUNET_PACKED;
uint16_t flags GNUNET_PACKED;
uint16_t qdcount GNUNET_PACKED;
uint16_t ancount GNUNET_PACKED;
uint16_t nscount GNUNET_PACKED;
uint16_t arcount GNUNET_PACKED;
};
GNUNET_NETWORK_STRUCT_END
/**
* Initialize an IPv4 header.
*
* @param ip header to initialize
* @param protocol protocol to use (i.e. IPPROTO_UDP)
* @param payload_length number of bytes of payload that follow (excluding IPv4 header)
* @param src source IP address to use
* @param dst destination IP address to use
*/
void
GNUNET_TUN_initialize_ipv4_header (struct GNUNET_TUN_IPv4Header *ip,
uint8_t protocol,
uint16_t payload_length,
const struct in_addr *src,
const struct in_addr *dst);
#endif
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