/*
* Copyright (c) 2009 Lukas Mejdrech
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup ip
* @{
*/
/** @file
* Internet protocol header and options definitions.
* Names according to the linux src/include/linux/ip.h header file.
*/
#ifndef __NET_IP_HEADER_H__
#define __NET_IP_HEADER_H__
#include <byteorder.h>
#include <types.h>
/** Type definition of the internet header.
* @see ip_header
*/
typedef struct ip_header ip_header_t;
/** Type definition of the internet header pointer.
* @see ip_header
*/
typedef ip_header_t * ip_header_ref;
/** Internet header.
* The variable options should be included after the header itself and indicated by the increased header length value.
*/
struct ip_header{
#ifdef ARCH_IS_BIG_ENDIAN
/** The Version field indicates the format of the internet header.
*/
uint8_t:4 version;
/** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
* Note that the minimum value for a~correct header is~5.
*/
uint8_t:4 ihl;
#else
/** Internet Header Length is the length of the internet header in 32~bit words, and thus points to the beginning of the data.
* Note that the minimum value for a~correct header is~5.
*/
uint8_t:4 ihl;
/** The Version field indicates the format of the internet header.
*/
uint8_t:4 version;
#endif
/** The Type of Service provides an indication of the abstract parameters of the quality of service desired.
* These parameters are to be used to guide the selection of the actual service parameters when transmitting a~datagram through a~particular network.
* Several networks offer service precedence, which somehow treats high precedence traffic as more important than other traffic (generally by accepting only traffic above a~certain precedence at time of high load).
* The major choice is a~three way tradeoff between low-delay, high-reliability, and high-throughput.
*/
uint8_t tos;
/** Total Length is the length of the datagram, measured in octets, including internet header and data.
* This field allows the length of a~datagram to be up to 65,535~octets.
*/
uint16_t total_length;
/** An identifying value assigned by the sender to aid in assembling the fragments of a~datagram.
*/
unit16_t identification;
#ifdef ARCH_IS_BIG_ENDIAN
/** Various control flags.
*/
uint_16:3 flags;
/** This field indicates where in the datagram this fragment belongs.
*/
uint_16:13 fragment_offset;
#else
/** This field indicates where in the datagram this fragment belongs.
*/
uint_16:13 fragment_offset;
/** Various control flags.
*/
uint_16:3 flags;
#endif
/** This field indicates the maximum time the datagram is allowed to remain in the internet system.
* If this field contains the value zero, then the datagram must be destroyed.
* This field is modified in internet header processing.
* The time is measured in units of seconds, but since every module that processes a~datagram must decrease the TTL by at least one even if it process the datagram in less than a~second, the TTL must be thought of only as an upper bound on the time a~datagram may exist.
* The intention is to cause undeliverable datagrams to be discarded, and to bound the maximum datagram lifetime.
*/
uint8_t ttl;
/** This field indicates the next level protocol used in the data portion of the internet datagram.
*/
uint8_t protocol;
/** A checksum of the header only.
* Since some header fields change (e.g., time to live), this is recomputed and verified at each point that the internet header is processed.
* The checksum algorithm is: The checksum field is the 16~bit one's complement of the one's complement sum of all 16~bit words in the header.
* For purposes of computing the checksum, the value of the checksum field is zero.
*/
uint16_t header_checksum;
/** The source address.
*/
uint32_t source_address;
/** The destination address.
*/
uint32_t destination_address;
} __attribute__ ((packed));
/** Type definition of the internet option header.
* @see ip_header
*/
typedef struct ip_option ip_option_t;
/** Type definition of the internet option header pointer.
* @see ip_header
*/
typedef ip_option * ip_option_ref;
/** Internet option header.
* Only type field is always valid.
* Other fields' validity depends on the option type.
*/
struct ip_option{
/** A single octet of option-type.
*/
uint8_t type;
/** An option length octet.
*/
uint8_t length;
/** A~pointer.
*/
uint8_t pointer;
#ifdef ARCH_IS_BIG_ENDIAN
/** The number of IP modules that cannot register timestamps due to lack of space.
*/
uint8_t:4 overflow;
/** Various internet timestamp control flags.
*/
uint8_t:4 flags;
#else
/** Various internet timestamp control flags.
*/
uint8_t:4 flags;
/** The number of IP modules that cannot register timestamps due to lack of space.
*/
uint8_t:4 overflow;
#endif
} __attribute__ ((packed));
#define IPTOS_TOS_MASK 0x1E
#define IPTOS_PRECEDENCE_SHIFT 5
#define IPTOS_DELAY_SHIFT 4
#define IPTOS_THROUGHPUT_SHIFT 3
#define IPTOS_RELIABILITY_SHIFT 2
#define IPTOS_COST_SHIFT 1
#define IPTOS_NORMALDELAY ( 0x0 << IPTOS_DELAY_SHIFT )
#define IPTOS_LOWDELAY ( 0x1 << IPTOS_DELAY_SHIFT )
#define IPTOS_NORMALTHROUGHPUT ( 0x0 << IPTOS_THROUGHPUT_SHIFT )
#define IPTOS_THROUGHPUT ( 0x1 << IPTOS_THROUGHPUT_SHIFT )
#define IPTOS_NORMALRELIABILITY ( 0x0 << IPTOS_RELIABILITY_SHIFT )
#define IPTOS_RELIABILITY ( 0x1 << IPTOS_RELIABILITY_SHIFT )
#define IPTOS_NORMALCOST ( 0x0 << IPTOS_COST_SHIFT )
#define IPTOS_MICNCOST ( 0x1 << IPTOS_COST_SHIFT )
#define IPTOS_PREC_MASK 0xE0
#define IPTOS_PREC_ROUTINE ( 0x0 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_PRIORITY ( 0x1 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_IMMEDIATE ( 0x2 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_FLASH ( 0x3 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_FLASHOVERRIDE ( 0x4 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_CRITIC_ECP ( 0x5 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_INTERNETCONTROL ( 0x6 << IPTOS_PRECEDENCE_SHIFT )
#define IPTOS_PREC_NETCONTROL ( 0x7 << IPTOS_PRECEDENCE_SHIFT )
#define IPFLAG_FRAGMENT_SHIFT 1
#define IPFLAG_FRAGMENTED_SHIFT 0
#define IPFLAG_MAY_FRAGMENT ( 0x0 << IPFLAG_FRAGMENT_SHIFT )
#define IPFLAG_DONT_FRAGMENT ( 0x1 << IPFLAG_FRAGMENT_SHIFT )
#define IPFLAG_LAST_FRAGMENT ( 0x0 << IPFLAG_FRAGMENTED_SHIFT )
#define IPFLAG_MORE_FRAGMENTS ( 0x1 << IPFLAG_FRAGMENTED_SHIFT )
#define IPOPT_COPY_SHIFT 7
#define IPOPT_CLASS_SHIFT 5
#define IPOPT_NUMBER_SHIFT 0
#define IPOPT_CLASS_MASK 0x60
#define IPOPT_NUMBER_MASK 0x1F
#define IPOPT_COPY ( 1 << IPOPT_COPY_SHIFT )
#define IPOPT_TYPE( copy, class, number ) ((( copy ) & IPOPT_COPY ) | (( class ) & IPOPT_CLASS_MASK ) | (( number << IPOPT_NUMBER_SHIFT ) & IPOPT_NUMBER_MASK ))
#define IPOPT_COPIED( o ) (( o ) & IPOPT_COPY )
#define IPOPT_CLASS( o ) (( o ) & IPOPT_CLASS_MASK )
#define IPOPT_NUMBER( o ) (( o ) & IPOPT_NUMBER_MASK )
#define IPOPT_CONTROL ( 1 << IPOPT_CLASS_SHIFT )
#define IPOPT_RESERVED1 ( 2 << IPOPT_CLASS_SHIFT )
#define IPOPT_MEASUREMENT ( 3 << IPOPT_CLASS_SHIFT )
#define IPOPT_RESERVED2 ( 4 << IPOPT_CLASS_SHIFT )
//#define IPOPT_END_OF_LIST 0x0
#define IPOPT_END IPOPT_TYPE( 0, IPOPT_CONTROL, 0 )
//#define IPOPT_NO_OPERATION 0x1
#define IPOPT_NOOP IPOPT_TYPE( 0, IPOPT_CONTROL, 1 )
//#define IPOPT_SECURITY 0x82
#define IPOPT_SEC IPOPT_TYPE( IPOPT_COPY, IPOPT_CONTROL, 2 )
#define IPOPT_SEC_LENGTH 11
#define IPOPT_SEC_UNCLASIFIED 0x0
#define IPOPT_SEC_CONFIDENTIAL 0xF035
#define IPOPT_SEC_EFTO 0x789A
#define IPOPT_SEC_MMMM 0xBC4D
#define IPOPT_SEC_PROG 0x5E26
#define IPOPT_SEC_RESTRICTED 0xAF13
#define IPOPT_SEC_SECRET 0xD788
#define IPOPT_SEC_TOP_SECRET 0x6BC5
//#define IPOPT_LOOSE_SOURCE 0x83
#define IPOPT_LSRR IPOPT_TYPE( IPOPT_COPY, IPOPT_CONTROL, 3 )
//#define IPOPT_STRICT_SOURCE 0x89
#define IPOPT_SSRR IPOPT_TYPE( IPOPT_COPY, IPOPT_CONTROL, 9 )
//#define IPOPT_RECORD_ROUTE 0x07
#define IPOPT_RR IPOPT_TYPE( IPOPT_COPY, IPOPT_CONTROL, 7 )
//#define IPOPT_STREAM_IDENTIFIER 0x88
#define IPOPT_SID IPOPT_TYPE( IPOPT_COPY, IPOPT_CONTROL, 8 )
#define IPOPT_SID_LENGTH 4
//#define IPOPT_INTERNET_TIMESTAMP 0x44
#define IPOPT_TIMESTAMP IPOPT_TYPE( IPOPT_COPY, IPOPT_MEASUREMENT, 4 )
#define IPOPT_CIPSO IPOPT_TYPE( IPOPT_COPY, IPOPT_CONTROL, 5 )
#define IPVERSION 4
#define MAXTTL 255
#define IPDEFTTL 64
#define IPOPT_OPTVAL 0
#define IPOPT_OLEN 1
#define IPOPT_OFFSET 2
#define IPOPT_MINOFF 4
#define MAX_IPOPTLEN 40
#define IPOPT_NOP IPOPT_NOOP
#define IPOPT_EOL IPOPT_END
#define IPOPT_TS IPOPT_TIMESTAMP
#define IPOPT_TS_TSONLY 0 /* timestamps only */
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define IPOPT_TS_PRESPEC 3 /* specified modules only */
#endif
/** @}
*/