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/*

 * 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

/** @}

 */