icmp_header.h

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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.
 */

#ifndef LIBNET_ICMP_HEADER_H_
#define LIBNET_ICMP_HEADER_H_

#include <sys/types.h>

#include <net/in.h>
#include <net/icmp_codes.h>

#define ICMP_HEADER_SIZE  sizeof(icmp_header_t)

typedef struct icmp_echo {
        icmp_param_t identifier;
        icmp_param_t sequence_number;
} __attribute__((packed)) icmp_echo_t;

typedef struct icmp_header {
        uint8_t type;
        
        uint8_t code;
        
        uint16_t checksum;
        
        union {
                icmp_echo_t echo;
                in_addr_t gateway;
                
                struct {
                        icmp_param_t reserved;
                        icmp_param_t mtu;
                } frag;
                
                struct {
                        icmp_param_t pointer;
                        icmp_param_t reserved;
                } param;
        } un;
} __attribute__((packed)) icmp_header_t;

#endif

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