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4707 mejdrech 1 
/*
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 * Copyright (c) 2009 Lukas Mejdrech
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup icmp
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 *  @{
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 */
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/** @file
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 *  ICMP header definition.
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 *  Based on the RFC~792.
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 */
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#ifndef __NET_ICMP_HEADER_H__
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#define __NET_ICMP_HEADER_H__
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#include <sys/types.h>
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#include "../../include/in.h"
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#include "../../include/icmp_codes.h"
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/** Type definition of the echo specific data.
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 *  @see icmp_echo
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 */
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typedef struct icmp_echo    icmp_echo_t;
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/** Type definition of the echo specific data pointer.
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 *  @see icmp_echo
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 */
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typedef icmp_echo_t *       icmp_echo_ref;
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/** Echo specific data.
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 */
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struct icmp_echo{
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    /** Message idintifier.
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     */
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    icmp_param_t    identifier;
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    /** Message sequence number.
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     */
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    icmp_param_t    sequence_number;
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} __attribute__ ((packed));
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/** Type definition of the internet control message header.
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 *  @see icmp_header
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 */
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typedef struct icmp_header  icmp_header_t;
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/** Type definition of the internet control message header pointer.
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 *  @see icmp_header
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 */
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typedef icmp_header_t *     icmp_header_ref;
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/** Internet control message header.
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 */
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struct icmp_header{
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    /** The type of the message.
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     */
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    uint8_t type;
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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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     */
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    uint8_t code;
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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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     */
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    uint16_t    checksum;
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    /** Message specific data.
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     */
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    union{
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        /** Echo specific data.
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         */
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        icmp_echo_t         echo;
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        /** Proposed gateway value.
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         */
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        in_addr_t           gateway;
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        /** Fragmentation needed specific data.
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         */
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        struct{
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            /** Reserved field.
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             *  Must be zero.
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             */
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            icmp_param_t    reserved;
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            /** Proposed MTU.
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             */
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            icmp_param_t    mtu;
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        } frag;
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        /** Parameter problem specific data.
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         */
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        struct{
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            /** Problem pointer.
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             */
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            icmp_param_t    pointer;
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            /** Reserved field.
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             *  Must be zero.
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             */
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            icmp_param_t    reserved;
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        } param;
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    } un;
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} __attribute__ ((packed));
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#endif
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/** @}
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 */