/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */

#pragma once

#include <bits/stdint.h>
#include <sys/cdefs.h>

__BEGIN_DECLS

struct icmphdr {
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
    union {
        struct {
            uint16_t id;
            uint16_t sequence;
        } echo;
        uint32_t gateway;
    } un;
};

#define ICMP_ECHOREPLY 0       // Echo Reply
#define ICMP_DEST_UNREACH 3    // Destination Unreachable
#define ICMP_SOURCE_QUENCH 4   // Source Quench
#define ICMP_REDIRECT 5        // Redirect
#define ICMP_ECHO 8            // Echo Request
#define ICMP_TIME_EXCEEDED 11  // Time Exceeded
#define ICMP_PARAMETERPROB 12  // Parameter Problem
#define ICMP_TIMESTAMP 13      // Timestamp Request
#define ICMP_TIMESTAMPREPLY 14 // Timestamp Reply
#define ICMP_INFO_REQUEST 15   // Information Request
#define ICMP_INFO_REPLY 16     // Information Reply
#define ICMP_ADDRESS 17        // Address Mask Request
#define ICMP_ADDRESSREPLY 18   // Address Mask Reply
#define NR_ICMP_TYPES 18

__END_DECLS