#ifndef _LINUX_ICMPV6_H
  #define _LINUX_ICMPV6_H

  #include <linux/types.h>

  #include <asm/byteorder.h>
  
  struct icmp6hdr {
  
  	__u8		icmp6_type;
  	__u8		icmp6_code;

  	__sum16		icmp6_cksum;

  
  
  	union {

  		__be32			un_data32[1];
  		__be16			un_data16[2];

  		__u8			un_data8[4];
  
  		struct icmpv6_echo {

  			__be16		identifier;
  			__be16		sequence;

  		} u_echo;
  
                  struct icmpv6_nd_advt {
  #if defined(__LITTLE_ENDIAN_BITFIELD)
                          __u32		reserved:5,
                          		override:1,
                          		solicited:1,
                          		router:1,
  					reserved2:24;
  #elif defined(__BIG_ENDIAN_BITFIELD)
                          __u32		router:1,
  					solicited:1,
                          		override:1,
                          		reserved:29;
  #else
  #error	"Please fix <asm/byteorder.h>"
  #endif						
                  } u_nd_advt;
  
                  struct icmpv6_nd_ra {
  			__u8		hop_limit;
  #if defined(__LITTLE_ENDIAN_BITFIELD)

  			__u8		reserved:3,

  					router_pref:2,

  					home_agent:1,

  					other:1,
  					managed:1;
  
  #elif defined(__BIG_ENDIAN_BITFIELD)
  			__u8		managed:1,
  					other:1,

  					home_agent:1,

  					router_pref:2,

  					reserved:3;

  #else
  #error	"Please fix <asm/byteorder.h>"
  #endif

  			__be16		rt_lifetime;

                  } u_nd_ra;
  
  	} icmp6_dataun;
  
  #define icmp6_identifier	icmp6_dataun.u_echo.identifier
  #define icmp6_sequence		icmp6_dataun.u_echo.sequence
  #define icmp6_pointer		icmp6_dataun.un_data32[0]
  #define icmp6_mtu		icmp6_dataun.un_data32[0]
  #define icmp6_unused		icmp6_dataun.un_data32[0]
  #define icmp6_maxdelay		icmp6_dataun.un_data16[0]
  #define icmp6_router		icmp6_dataun.u_nd_advt.router
  #define icmp6_solicited		icmp6_dataun.u_nd_advt.solicited
  #define icmp6_override		icmp6_dataun.u_nd_advt.override
  #define icmp6_ndiscreserved	icmp6_dataun.u_nd_advt.reserved
  #define icmp6_hop_limit		icmp6_dataun.u_nd_ra.hop_limit
  #define icmp6_addrconf_managed	icmp6_dataun.u_nd_ra.managed
  #define icmp6_addrconf_other	icmp6_dataun.u_nd_ra.other
  #define icmp6_rt_lifetime	icmp6_dataun.u_nd_ra.rt_lifetime

  #define icmp6_router_pref	icmp6_dataun.u_nd_ra.router_pref

  };

  #ifdef __KERNEL__
  #include <linux/skbuff.h>
  
  static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
  {

  	return (struct icmp6hdr *)skb_transport_header(skb);

  }
  #endif

  #define ICMPV6_ROUTER_PREF_LOW		0x3
  #define ICMPV6_ROUTER_PREF_MEDIUM	0x0
  #define ICMPV6_ROUTER_PREF_HIGH		0x1
  #define ICMPV6_ROUTER_PREF_INVALID	0x2

  
  #define ICMPV6_DEST_UNREACH		1
  #define ICMPV6_PKT_TOOBIG		2
  #define ICMPV6_TIME_EXCEED		3
  #define ICMPV6_PARAMPROB		4
  
  #define ICMPV6_INFOMSG_MASK		0x80
  
  #define ICMPV6_ECHO_REQUEST		128
  #define ICMPV6_ECHO_REPLY		129
  #define ICMPV6_MGM_QUERY		130
  #define ICMPV6_MGM_REPORT       	131
  #define ICMPV6_MGM_REDUCTION    	132
  
  #define ICMPV6_NI_QUERY			139
  #define ICMPV6_NI_REPLY			140
  
  #define ICMPV6_MLD2_REPORT		143
  
  #define ICMPV6_DHAAD_REQUEST		144
  #define ICMPV6_DHAAD_REPLY		145
  #define ICMPV6_MOBILE_PREFIX_SOL	146
  #define ICMPV6_MOBILE_PREFIX_ADV	147
  
  /*
   *	Codes for Destination Unreachable
   */
  #define ICMPV6_NOROUTE			0
  #define ICMPV6_ADM_PROHIBITED		1
  #define ICMPV6_NOT_NEIGHBOUR		2
  #define ICMPV6_ADDR_UNREACH		3
  #define ICMPV6_PORT_UNREACH		4
  
  /*
   *	Codes for Time Exceeded
   */
  #define ICMPV6_EXC_HOPLIMIT		0
  #define ICMPV6_EXC_FRAGTIME		1
  
  /*
   *	Codes for Parameter Problem
   */
  #define ICMPV6_HDR_FIELD		0
  #define ICMPV6_UNK_NEXTHDR		1
  #define ICMPV6_UNK_OPTION		2
  
  /*
   *	constants for (set|get)sockopt
   */
  
  #define ICMPV6_FILTER			1
  
  /*
   *	ICMPV6 filter
   */
  
  #define ICMPV6_FILTER_BLOCK		1
  #define ICMPV6_FILTER_PASS		2
  #define ICMPV6_FILTER_BLOCKOTHERS	3
  #define ICMPV6_FILTER_PASSONLY		4
  
  struct icmp6_filter {
  	__u32		data[8];
  };
  
  /*
   *	Definitions for MLDv2
   */
  #define MLD2_MODE_IS_INCLUDE	1
  #define MLD2_MODE_IS_EXCLUDE	2
  #define MLD2_CHANGE_TO_INCLUDE	3
  #define MLD2_CHANGE_TO_EXCLUDE	4
  #define MLD2_ALLOW_NEW_SOURCES	5
  #define MLD2_BLOCK_OLD_SOURCES	6
  
  #define MLD2_ALL_MCR_INIT { { { 0xff,0x02,0,0,0,0,0,0,0,0,0,0,0,0,0,0x16 } } }
  
  #ifdef __KERNEL__
  
  #include <linux/netdevice.h>

  
  extern void				icmpv6_send(struct sk_buff *skb,

  						    u8 type, u8 code,

  						    __u32 info);

  extern int				icmpv6_init(void);

  extern int				icmpv6_err_convert(u8 type, u8 code,

  							   int *err);
  extern void				icmpv6_cleanup(void);
  extern void				icmpv6_param_prob(struct sk_buff *skb,

  							  u8 code, int pos);

  
  struct flowi;

  struct in6_addr;

  extern void				icmpv6_flow_init(struct sock *sk,
  							 struct flowi *fl,
  							 u8 type,
  							 const struct in6_addr *saddr,
  							 const struct in6_addr *daddr,
  							 int oif);

  #endif
  
  #endif