/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * 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.
 * 3. 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.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */
#ifndef __LWIP_ICMP_H__
#define __LWIP_ICMP_H__

#include "lwip/opt.h"

#if LWIP_ICMP                   /* don't build if not configured for use in lwipopts.h */

#include "lwip/pbuf.h"
#include "lwip/netif.h"

#ifdef __cplusplus
extern "C" {
#endif

#define ICMP6_DUR  1
#define ICMP6_TE   3
#define ICMP6_ECHO 128          /* echo */
#define ICMP6_ER   129          /* echo reply */


    enum icmp_dur_type {
        ICMP_DUR_NET = 0,       /* net unreachable */
        ICMP_DUR_HOST = 1,      /* host unreachable */
        ICMP_DUR_PROTO = 2,     /* protocol unreachable */
        ICMP_DUR_PORT = 3,      /* port unreachable */
        ICMP_DUR_FRAG = 4,      /* fragmentation needed and DF set */
        ICMP_DUR_SR = 5         /* source route failed */
    };

    enum icmp_te_type {
        ICMP_TE_TTL = 0,        /* time to live exceeded in transit */
        ICMP_TE_FRAG = 1        /* fragment reassembly time exceeded */
    };

    void icmp_input(struct pbuf *p, struct netif *inp);

    void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
    void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);

    struct icmp_echo_hdr {
        u8_t type;
        u8_t icode;
        u16_t chksum;
        u16_t id;
        u16_t seqno;
    };

    struct icmp_dur_hdr {
        u8_t type;
        u8_t icode;
        u16_t chksum;
        u32_t unused;
    };

    struct icmp_te_hdr {
        u8_t type;
        u8_t icode;
        u16_t chksum;
        u32_t unused;
    };

#ifdef __cplusplus
}
#endif
#endif                          /* LWIP_ICMP */
#endif                          /* __LWIP_ICMP_H__ */
