icmp.h

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/**
*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the ICMP protocol.
 *
 * Version:     @(#)icmp.h      1.0.3   04/28/93
 *
 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.


*/
#ifndef _LINUX_ICMP_H
#define _LINUX_ICMP_H

#define ICMP_ECHOREPLY          0       ///< Echo Reply                 
#define ICMP_DEST_UNREACH       3       ///< Destination Unreachable    
#define ICMP_SOURCE_QUENCH      4       ///< Source Quench              
#define ICMP_REDIRECT           5       ///< Redirect (change route)    
#define ICMP_ECHO               8       ///< Echo Request                       
#define ICMP_TIME_EXCEEDED      11      ///< Time Exceeded              
#define ICMP_PARAMETERPROB      12      ///< Parameter Problem          
#define ICMP_TIMESTAMP          13      ///< Timestamp Request          
#define ICMP_TIMESTAMPREPLY     14      ///< Timestamp Reply            
#define ICMP_INFO_REQUEST       15      ///< Information Request                
#define ICMP_INFO_REPLY         16      ///< Information Reply          
#define ICMP_ADDRESS            17      ///< Address Mask Request               
#define ICMP_ADDRESSREPLY       18      ///< Address Mask Reply         


/// Codes for UNREACH. 
#define ICMP_NET_UNREACH        0       ///< Network Unreachable                
#define ICMP_HOST_UNREACH       1       ///< Host Unreachable           
#define ICMP_PROT_UNREACH       2       ///< Protocol Unreachable               
#define ICMP_PORT_UNREACH       3       ///< Port Unreachable           
#define ICMP_FRAG_NEEDED        4       ///< Fragmentation Needed/DF set        
#define ICMP_SR_FAILED          5       ///< Source Route failed                
#define ICMP_NET_UNKNOWN        6
#define ICMP_HOST_UNKNOWN       7
#define ICMP_HOST_ISOLATED      8
#define ICMP_NET_ANO            9
#define ICMP_HOST_ANO           10
#define ICMP_NET_UNR_TOS        11
#define ICMP_HOST_UNR_TOS       12

/// Codes for REDIRECT. 
#define ICMP_REDIR_NET          0       ///< Redirect Net                       
#define ICMP_REDIR_HOST         1       ///< Redirect Host              
#define ICMP_REDIR_NETTOS       2       ///< Redirect Net for TOS               
#define ICMP_REDIR_HOSTTOS      3       ///< Redirect Host for TOS      

/// Codes for TIME_EXCEEDED. 
#define ICMP_EXC_TTL            0       ///< TTL count exceeded         
#define ICMP_EXC_FRAGTIME       1       ///< Fragment Reass time exceeded       


struct icmphdr {
  unsigned char         type;
  unsigned char         code;
  unsigned short        checksum;
  union {
        struct {
                unsigned short  id;
                unsigned short  sequence;
        } echo;
        unsigned long gateway;
  } un;
};


struct icmp_err {
  int           errno;
  unsigned      fatal:1;
};


#endif  // _LINUX_ICMP_H 

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