/*
   * 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
  
  #include <linux/types.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		*/
  #define NR_ICMP_TYPES		18
  
  
  /* 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
  #define ICMP_PKT_FILTERED	13	/* Packet filtered */
  #define ICMP_PREC_VIOLATION	14	/* Precedence violation */
  #define ICMP_PREC_CUTOFF	15	/* Precedence cut off */
  #define NR_ICMP_UNREACH		15	/* instead of hardcoding immediate value */
  
  /* 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 {
    __u8		type;
    __u8		code;

    __sum16	checksum;

    union {
  	struct {

  		__be16	id;
  		__be16	sequence;

  	} echo;

  	__be32	gateway;

  	struct {

  		__be16	__unused;
  		__be16	mtu;

  	} frag;
    } un;
  };

  #ifdef __KERNEL__
  #include <linux/skbuff.h>
  
  static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
  {

  	return (struct icmphdr *)skb_transport_header(skb);

  }
  #endif

  /*
   *	constants for (set|get)sockopt
   */
  
  #define ICMP_FILTER			1
  
  struct icmp_filter {
  	__u32		data;
  };
  
  
  #endif	/* _LINUX_ICMP_H */