www.pudn.com > TCPmodbushy.rar > icmp.h

/* 
 * 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  
 * 
 */ 
#ifndef __LWIP_ICMP_H__ 
#define __LWIP_ICMP_H__ 
 
#include "o:/lwip/arch.h" 
 
#include "o:/lwip/opt.h" 
#include "o:/lwip/pbuf.h" 
 
#include "o:/IPV4/lwip/ip_addr.h" 
#include "o:/lwip/netif.h" 
 
#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 */ 
}; 
 
void icmp_input(struct pbuf xdata *p); 
 
void icmp_dest_unreach(struct pbuf xdata *p, enum icmp_dur_type t); 
void icmp_time_exceeded(struct pbuf xdata *p, enum icmp_te_type t); 
 
#ifdef PACK_STRUCT_USE_INCLUDES 
#  include "arch/bpstruct.h" 
#endif 
PACK_STRUCT_BEGIN 
struct icmp_echo_hdr { 
  PACK_STRUCT_FIELD(u16_t _type_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 
 
PACK_STRUCT_BEGIN 
struct icmp_dur_hdr { 
  PACK_STRUCT_FIELD(u16_t _type_code); 
  PACK_STRUCT_FIELD(u16_t chksum); 
  PACK_STRUCT_FIELD(u32_t unused); 
} PACK_STRUCT_STRUCT; 
PACK_STRUCT_END 
 
PACK_STRUCT_BEGIN 
struct icmp_te_hdr { 
  PACK_STRUCT_FIELD(u16_t _type_code); 
  PACK_STRUCT_FIELD(u16_t chksum); 
  PACK_STRUCT_FIELD(u32_t unused); 
} PACK_STRUCT_STRUCT; 
PACK_STRUCT_END 
#ifdef PACK_STRUCT_USE_INCLUDES 
#  include "arch/epstruct.h" 
#endif 
 
#define ICMPH_TYPE(hdr) (ntohs((hdr)->_type_code) >> 8) 
#define ICMPH_CODE(hdr) (ntohs((hdr)->_type_code) & 0xff) 
 
#define ICMPH_TYPE_SET(hdr, type) ((hdr)->_type_code = htons(ICMPH_CODE(hdr) | ((type) << 8))) 
#define ICMPH_CODE_SET(hdr, codea) ((hdr)->_type_code = htons((codea) | (ICMPH_TYPE(hdr) << 8))) 
 
#endif /* __LWIP_ICMP_H__ */