/usr/include/gnunet/gnunet_tun_lib.h is in gnunet-dev 0.9.3-7build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 GNUNET_PACKED;
/**
* Here we get an ETH_P_-number.
*/
uint16_t proto GNUNET_PACKED;
};
/**
* Standard IPv4 header.
*/
struct GNUNET_TUN_IPv4Header
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
unsigned int header_length:4 GNUNET_PACKED;
unsigned int version:4 GNUNET_PACKED;
#elif __BYTE_ORDER == __BIG_ENDIAN
unsigned int version:4 GNUNET_PACKED;
unsigned int header_length:4 GNUNET_PACKED;
#else
#error byteorder undefined
#endif
uint8_t diff_serv;
/**
* Length of the packet, including this header.
*/
uint16_t total_length GNUNET_PACKED;
/**
* Unique random ID for matching up fragments.
*/
uint16_t identification GNUNET_PACKED;
unsigned int flags:3 GNUNET_PACKED;
unsigned int fragmentation_offset:13 GNUNET_PACKED;
/**
* How many more hops can this packet be forwarded?
*/
uint8_t ttl;
/**
* L4-protocol, for example, IPPROTO_UDP or IPPROTO_TCP.
*/
uint8_t protocol;
/**
* Checksum.
*/
uint16_t checksum GNUNET_PACKED;
/**
* Origin of the packet.
*/
struct in_addr source_address GNUNET_PACKED;
/**
* Destination of the packet.
*/
struct in_addr destination_address GNUNET_PACKED;
} GNUNET_GCC_STRUCT_LAYOUT;
/**
* Standard IPv6 header.
*/
struct GNUNET_TUN_IPv6Header
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
unsigned int traffic_class_h:4 GNUNET_PACKED;
unsigned int version:4 GNUNET_PACKED;
unsigned int traffic_class_l:4 GNUNET_PACKED;
unsigned int flow_label:20 GNUNET_PACKED;
#elif __BYTE_ORDER == __BIG_ENDIAN
unsigned int version:4 GNUNET_PACKED;
unsigned int traffic_class:8 GNUNET_PACKED;
unsigned int flow_label:20 GNUNET_PACKED;
#else
#error byteorder undefined
#endif
/**
* Length of the payload, excluding this header.
*/
uint16_t payload_length GNUNET_PACKED;
/**
* For example, IPPROTO_UDP or IPPROTO_TCP.
*/
uint8_t next_header;
/**
* How many more hops can this packet be forwarded?
*/
uint8_t hop_limit;
/**
* Origin of the packet.
*/
struct in6_addr source_address GNUNET_PACKED;
/**
* Destination of the packet.
*/
struct in6_addr destination_address GNUNET_PACKED;
} GNUNET_GCC_STRUCT_LAYOUT;
/**
* TCP packet header.
*/
struct GNUNET_TUN_TcpHeader
{
uint16_t source_port GNUNET_PACKED;
uint16_t destination_port GNUNET_PACKED;
/**
* Sequence number.
*/
uint32_t seq GNUNET_PACKED;
/**
* Acknowledgement number.
*/
uint32_t ack GNUNET_PACKED;
#if __BYTE_ORDER == __LITTLE_ENDIAN
/**
* Reserved. Must be zero.
*/
unsigned int reserved : 4 GNUNET_PACKED;
/**
* Number of 32-bit words in TCP header.
*/
unsigned int off : 4 GNUNET_PACKED;
#elif __BYTE_ORDER == __BIG_ENDIAN
/**
* Number of 32-bit words in TCP header.
*/
unsigned int off : 4 GNUNET_PACKED;
/**
* Reserved. Must be zero.
*/
unsigned int reserved : 4 GNUNET_PACKED;
#else
#error byteorder undefined
#endif
/**
* Flags (SYN, FIN, ACK, etc.)
*/
uint8_t flags;
/**
* Window size.
*/
uint16_t window_size GNUNET_PACKED;
/**
* Checksum.
*/
uint16_t crc GNUNET_PACKED;
/**
* Urgent pointer.
*/
uint16_t urgent_pointer GNUNET_PACKED;
} GNUNET_GCC_STRUCT_LAYOUT;
/**
* UDP packet header.
*/
struct GNUNET_TUN_UdpHeader
{
uint16_t source_port GNUNET_PACKED;
uint16_t destination_port 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;
};
#define GNUNET_TUN_ICMPTYPE_ECHO_REPLY 0
#define GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE 3
#define GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH 4
#define GNUNET_TUN_ICMPTYPE_REDIRECT_MESSAGE 5
#define GNUNET_TUN_ICMPTYPE_ECHO_REQUEST 8
#define GNUNET_TUN_ICMPTYPE_ROUTER_ADVERTISEMENT 9
#define GNUNET_TUN_ICMPTYPE_ROUTER_SOLICITATION 10
#define GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED 11
#define GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE 1
#define GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG 2
#define GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED 3
#define GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM 4
#define GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST 128
#define GNUNET_TUN_ICMPTYPE6_ECHO_REPLY 129
/**
* ICMP header.
*/
struct GNUNET_TUN_IcmpHeader {
uint8_t type;
uint8_t code;
uint16_t crc GNUNET_PACKED;
union {
/**
* ICMP Echo (request/reply)
*/
struct {
uint16_t identifier GNUNET_PACKED;
uint16_t sequence_number GNUNET_PACKED;
} echo;
/**
* ICMP Destination Unreachable (RFC 1191)
*/
struct ih_pmtu {
uint16_t empty GNUNET_PACKED;
uint16_t next_hop_mtu GNUNET_PACKED;
/* followed by original IP header + first 8 bytes of original IP datagram */
} destination_unreachable;
/**
* ICMP Redirect
*/
struct in_addr redirect_gateway_address GNUNET_PACKED;
/**
* MTU for packets that are too big (IPv6).
*/
uint32_t packet_too_big_mtu GNUNET_PACKED;
} quench;
};
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);
/**
* Initialize an IPv6 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_ipv6_header (struct GNUNET_TUN_IPv6Header *ip,
uint8_t protocol,
uint16_t payload_length,
const struct in6_addr *src,
const struct in6_addr *dst);
/**
* Calculate IPv4 TCP checksum.
*
* @param ip ipv4 header fully initialized
* @param tcp TCP header (initialized except for CRC)
* @param payload the TCP payload
* @param payload_length number of bytes of TCP payload
*/
void
GNUNET_TUN_calculate_tcp4_checksum (const struct GNUNET_TUN_IPv4Header *ip,
struct GNUNET_TUN_TcpHeader *tcp,
const void *payload,
uint16_t payload_length);
/**
* Calculate IPv6 TCP checksum.
*
* @param ip ipv6 header fully initialized
* @param tcp TCP header (initialized except for CRC)
* @param payload the TCP payload
* @param payload_length number of bytes of TCP payload
*/
void
GNUNET_TUN_calculate_tcp6_checksum (const struct GNUNET_TUN_IPv6Header *ip,
struct GNUNET_TUN_TcpHeader *tcp,
const void *payload,
uint16_t payload_length);
/**
* Calculate IPv4 UDP checksum.
*
* @param ip ipv4 header fully initialized
* @param udp UDP header (initialized except for CRC)
* @param payload the UDP payload
* @param payload_length number of bytes of UDP payload
*/
void
GNUNET_TUN_calculate_udp4_checksum (const struct GNUNET_TUN_IPv4Header *ip,
struct GNUNET_TUN_UdpHeader *udp,
const void *payload,
uint16_t payload_length);
/**
* Calculate IPv6 UDP checksum.
*
* @param ip ipv6 header fully initialized
* @param udp UDP header (initialized except for CRC)
* @param payload the UDP payload
* @param payload_length number of bytes of UDP payload
*/
void
GNUNET_TUN_calculate_udp6_checksum (const struct GNUNET_TUN_IPv6Header *ip,
struct GNUNET_TUN_UdpHeader *udp,
const void *payload,
uint16_t payload_length);
/**
* Calculate ICMP checksum.
*
* @param icmp IMCP header (initialized except for CRC)
* @param payload the ICMP payload
* @param payload_length number of bytes of ICMP payload
*/
void
GNUNET_TUN_calculate_icmp_checksum (struct GNUNET_TUN_IcmpHeader *icmp,
const void *payload,
uint16_t payload_length);
#endif
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