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 *  @{
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 *  @{
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 */
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 */
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/** @file
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/** @file
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 *  ICMP header definition.
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 *  ICMP header definition.
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 *  Names according to the linux src/include/linux/icmp.h header file.
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 *  Based on the RFC~792.
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 */
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 */
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#ifndef __NET_ICMP_HEADER_H__
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#ifndef __NET_ICMP_HEADER_H__
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#define __NET_ICMP_HEADER_H__
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#define __NET_ICMP_HEADER_H__
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/** Echo specific data.
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/** Echo specific data.
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 */
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 */
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struct icmp_echo{
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struct icmp_echo{
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    /** Message idintifier.
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    /** Message idintifier.
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     */
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     */
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    icmp_param_t    id;
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    icmp_param_t    identifier;
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    /** Message sequence number.
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    /** Message sequence number.
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     */
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     */
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    icmp_param_t    sequence;
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    icmp_param_t    sequence_number;
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} __attribute__ ((packed));
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} __attribute__ ((packed));
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/** Type definition of the internet control message header.
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/** Type definition of the internet control message header.
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 *  @see icmp_header
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 *  @see icmp_header
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 */
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 */
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typedef icmp_header_t *     icmp_header_ref;
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typedef icmp_header_t *     icmp_header_ref;
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/** Internet control message header.
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/** Internet control message header.
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 */
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 */
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struct icmp_header{
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struct icmp_header{
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    /** Specifies the type of the message.
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    /** The type of the message.
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     */
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     */
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    uint8_t type;
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    uint8_t type;
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    /** Contains the error code for the datagram reported by this ICMP message.
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    /** The error code for the datagram reported by the ICMP message.
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     *  The interpretation is dependent on the message type.
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     *  The interpretation is dependent on the message type.
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     */
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     */
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    uint8_t code;
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    uint8_t code;
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    /** Contains the checksum for the ICMP message starting with the ICMP Type field.
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    /** The checksum is the 16-bit ones's complement of the one's complement sum of the ICMP message starting with the ICMP Type.
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     *  For computing the checksum, the checksum field should be zero.
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     *  If the checksum does not match the contents, the datagram is discarded.
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     *  If the checksum does not match the contents, the datagram is discarded.
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     */
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     */
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    uint16_t    checksum;
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    uint16_t    checksum;
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    /** Message specific data.
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    /** Message specific data.
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     */
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     */
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         */
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         */
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        in_addr_t           gateway;
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        in_addr_t           gateway;
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        /** Fragmentation needed specific data.
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        /** Fragmentation needed specific data.
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         */
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         */
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        struct{
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        struct{
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            /** Unused field.
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            /** Reserved field.
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             *  Must be zero.
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             */
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             */
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            icmp_param_t    _unused;
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            icmp_param_t    reserved;
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            /** Proposed MTU.
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            /** Proposed MTU.
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             */
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             */
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            icmp_param_t    mtu;
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            icmp_param_t    mtu;
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        } frag;
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        } frag;
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        /** Parameter problem specific data.
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        /** Parameter problem specific data.
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         */
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         */
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        struct{
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        struct{
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            /** Problem pointer.
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            /** Problem pointer.
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             */
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             */
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            icmp_param_t    pointer;
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            icmp_param_t    pointer;
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            /** Unused field.
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            /** Reserved field.
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             *  Must be zero.
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             */
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             */
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            icmp_param_t    _unused;
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            icmp_param_t    reserved;
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        } param;
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        } param;
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    } un;
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    } un;
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} __attribute__ ((packed));
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} __attribute__ ((packed));
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#endif
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#endif