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  #   ˆl–äY>”Êh¥	@·q·nJbÑ¿Æƒm—ÛÁ¿Ä     /* Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _NETINET_IP6_H
#define _NETINET_IP6_H 1

#include <inttypes.h>
#include <netinet/in.h>

struct ip6_hdr
  {
    union
      {
	struct ip6_hdrctl
	  {
	    uint32_t ip6_un1_flow;   /* 4 bits version, 8 bits TC,
					20 bits flow-ID */
	    uint16_t ip6_un1_plen;   /* payload length */
	    uint8_t  ip6_un1_nxt;    /* next header */
	    uint8_t  ip6_un1_hlim;   /* hop limit */
	  } ip6_un1;
	uint8_t ip6_un2_vfc;       /* 4 bits version, top 4 bits tclass */
      } ip6_ctlun;
    struct in6_addr ip6_src;      /* source address */
    struct in6_addr ip6_dst;      /* destination address */
  };

#define ip6_vfc   ip6_ctlun.ip6_un2_vfc
#define ip6_flow  ip6_ctlun.ip6_un1.ip6_un1_flow
#define ip6_plen  ip6_ctlun.ip6_un1.ip6_un1_plen
#define ip6_nxt   ip6_ctlun.ip6_un1.ip6_un1_nxt
#define ip6_hlim  ip6_ctlun.ip6_un1.ip6_un1_hlim
#define ip6_hops  ip6_ctlun.ip6_un1.ip6_un1_hlim

/* Generic extension header.  */
struct ip6_ext
  {
    uint8_t  ip6e_nxt;		/* next header.  */
    uint8_t  ip6e_len;		/* length in units of 8 octets.  */
  };

/* Hop-by-Hop options header.  */
struct ip6_hbh
  {
    uint8_t  ip6h_nxt;		/* next header.  */
    uint8_t  ip6h_len;		/* length in units of 8 octets.  */
    /* followed by options */
  };

/* Destination options header */
struct ip6_dest
  {
    uint8_t  ip6d_nxt;		/* next header */
    uint8_t  ip6d_len;		/* length in units of 8 octets */
    /* followed by options */
  };

/* Routing header */
struct ip6_rthdr
  {
    uint8_t  ip6r_nxt;		/* next header */
    uint8_t  ip6r_len;		/* length in units of 8 octets */
    uint8_t  ip6r_type;		/* routing type */
    uint8_t  ip6r_segleft;	/* segments left */
    /* followed by routing type specific data */
  };

/* Type 0 Routing header */
struct ip6_rthdr0
  {
    uint8_t  ip6r0_nxt;		/* next header */
    uint8_t  ip6r0_len;		/* length in units of 8 octets */
    uint8_t  ip6r0_type;	/* always zero */
    uint8_t  ip6r0_segleft;	/* segments left */
    uint8_t  ip6r0_reserved;	/* reserved field */
    uint8_t  ip6r0_slmap[3];	/* strict/loose bit map */
    /* followed by up to 127 struct in6_addr */
    struct in6_addr ip6r0_addr[0];
  };

/* Fragment header */
struct ip6_frag
  {
    uint8_t   ip6f_nxt;		/* next header */
    uint8_t   ip6f_reserved;	/* reserved field */
    uint16_t  ip6f_offlg;	/* offset, reserved, and flag */
    uint32_t  ip6f_ident;	/* identification */
  };

#if BYTE_ORDER == BIG_ENDIAN
# define IP6F_OFF_MASK       0xfff8  /* mask out offset from _offlg */
# define IP6F_RESERVED_MASK  0x0006  /* reserved bits in ip6f_offlg */
# define IP6F_MORE_FRAG      0x0001  /* more-fragments flag */
#else   /* BYTE_ORDER == LITTLE_ENDIAN */
# define IP6F_OFF_MASK       0xf8ff  /* mask out offset from _offlg */
# define IP6F_RESERVED_MASK  0x0600  /* reserved bits in ip6f_offlg */
# define IP6F_MORE_FRAG      0x0100  /* more-fragments flag */
#endif

/* IPv6 options */
struct ip6_opt
  {
    uint8_t  ip6o_type;
    uint8_t  ip6o_len;
  };

/* The high-order 3 bits of the option type define the behavior
 * when processing an unknown option and whether or not the option
 * content changes in flight.
 */
#define IP6OPT_TYPE(o)		((o) & 0xc0)
#define IP6OPT_TYPE_SKIP	0x00
#defi