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/*

 * 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"

#include "lwip/pbuf.h"

#include "lwip/ip_addr.h"

#include "lwip/netif.h"

#ifdef __cplusplus

extern "C" {

#endif

#define ICMP_ER 0      /* echo reply */

#define ICMP_DUR 3     /* destination unreachable */

#define ICMP_SQ 4      /* source quench */

#define ICMP_RD 5      /* redirect */

#define ICMP_ECHO 8    /* echo */

#define ICMP_TE 11     /* time exceeded */

#define ICMP_PP 12     /* parameter problem */

#define ICMP_TS 13     /* timestamp */

#define ICMP_TSR 14    /* timestamp reply */

#define ICMP_IRQ 15    /* information request */

#define ICMP_IR 16     /* information 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 */

};

#ifdef PACK_STRUCT_USE_INCLUDES

#  include "arch/bpstruct.h"

#endif

/** This is the standard ICMP header only that the u32_t data

 *  is splitted to two u16_t like ICMP echo needs it.

 *  This header is also used for other ICMP types that do not

 *  use the data part.

 */

PACK_STRUCT_BEGIN

struct icmp_echo_hdr {

  PACK_STRUCT_FIELD(u8_t type);

  PACK_STRUCT_FIELD(u8_t code);

  PACK_STRUCT_FIELD(u16_t chksum);

  PACK_STRUCT_FIELD(u16_t id);

  PACK_STRUCT_FIELD(u16_t seqno);

} PACK_STRUCT_STRUCT;

PACK_STRUCT_END

#ifdef PACK_STRUCT_USE_INCLUDES

#  include "arch/epstruct.h"

#endif

#define ICMPH_TYPE(hdr) ((hdr)->type)

#define ICMPH_CODE(hdr) ((hdr)->code)

/** Combines type and code to an u16_t */

#define ICMPH_TYPE_SET(hdr, t) ((hdr)->type = (t))

#define ICMPH_CODE_SET(hdr, c) ((hdr)->code = (c))

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

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);

#endif /* LWIP_ICMP */

#ifdef __cplusplus

}

#endif

#endif /* __LWIP_ICMP_H__ */