icmp.h

LwIP是瑞士计算机科学院(Swedish Institute of Computer Science)的AdamDunkels等开发的一套用于嵌入式系统的开放源代码TCP/IP协议栈。LwIP的含义

/*
 * 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 <[e-mail]>
 *
 */
#ifndef __LWIP_ICMP_H__
#define __LWIP_ICMP_H__

#include "lwip/arch.h"

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

#include "lwip/netif.h"

#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;
};

#endif /* __LWIP_ICMP_H__ */