text: /*
   * 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"
  
  namespace inet {
  
  namespace tcp {
  
  #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 */
  };
  
  /** 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.
   */
  #ifdef PACK_STRUCT_USE_INCLUDES
  #  include "arch/bpstruct.h"
  #endif
  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
  
  } // namespace tcp
  
  } // namespace inet
  
  
  #endif /* __LWIP_ICMP_H__ */
  