text: /*	$FreeBSD: src/sys/netinet6/in6.h,v 1.7.2.7 2002/08/01 19:38:50 ume Exp $	*/
  /*	$KAME: in6.h,v 1.89 2001/05/27 13:28:35 itojun Exp $	*/
  
  /*
   * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   * 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. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
   */
  
  /*
   * Copyright (c) 1982, 1986, 1990, 1993
   *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
   *
   *	@(#)in.h	8.3 (Berkeley) 1/3/94
   */
  
  #ifndef __KAME_NETINET_IN_H_INCLUDED_
  #error "do not include netinet6/in6.h directly, include netinet/in.h.  see RFC2553"
  #endif
  
  #ifndef _NETINET6_IN6_H_
  #define _NETINET6_IN6_H_
  
  #include <sys/cdefs.h>
  
  /*
   * Identification of the network protocol stack
   * for *BSD-current/release: http://www.kame.net/dev/cvsweb.cgi/kame/COVERAGE
   * has the table of implementation/integration differences.
   */
  #define __KAME__
  #define __KAME_VERSION		"20010528/FreeBSD"
  
  #ifndef _SA_FAMILY_T_DECLARED
  typedef	__uint8_t	sa_family_t;
  #define	_SA_FAMILY_T_DECLARED
  #endif
  
  #ifndef _SIZE_T_DECLARED
  typedef	__size_t	size_t;
  #define	_SIZE_T_DECLARED
  #endif
  
  #ifndef _SOCKLEN_T_DECLARED
  #define _SOCKLEN_T_DECLARED
  typedef __socklen_t	socklen_t;
  #endif
  
  #ifndef _UINT8_T_DECLARED
  typedef	__uint8_t	uint8_t;
  #define	_UINT8_T_DECLARED
  #endif
  #ifndef _UINT16_T_DECLARED
  typedef	__uint16_t	uint16_t;
  #define	_UINT16_T_DECLARED
  #endif
  #ifndef _UINT32_T_DECLARED
  typedef	__uint32_t	uint32_t;
  #define	_UINT32_T_DECLARED
  #endif
  
  /*
   * Local port number conventions:
   *
   * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
   * unless a kernel is compiled with IPNOPRIVPORTS defined.
   *
   * When a user does a bind(2) or connect(2) with a port number of zero,
   * a non-conflicting local port address is chosen.
   *
   * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
   * that is settable by sysctl(3); net.inet.ip.anonportmin and
   * net.inet.ip.anonportmax respectively.
   *
   * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
   * default assignment range.
   *
   * The value IP_PORTRANGE_DEFAULT causes the default behavior.
   *
   * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
   * and exists only for FreeBSD compatibility purposes.
   *
   * The value IP_PORTRANGE_LOW changes the range to the "low" are
   * that is (by convention) restricted to privileged processes.
   * This convention is based on "vouchsafe" principles only.
   * It is only secure if you trust the remote host to restrict these ports.
   * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
   */
  
  #if __BSD_VISIBLE
  #define	IPV6PORT_RESERVED	1024
  #define	IPV6PORT_ANONMIN	49152
  #define	IPV6PORT_ANONMAX	65535
  #define	IPV6PORT_RESERVEDMIN	600
  #define	IPV6PORT_RESERVEDMAX	(IPV6PORT_RESERVED-1)
  #endif
  
  /*
   * IPv6 address
   */
  #ifndef _STRUCT_IN6_ADDR_DECLARED
  struct in6_addr {
  	union {
  		uint8_t   __u6_addr8[16];
  		uint16_t  __u6_addr16[8];
  		uint32_t  __u6_addr32[4];
  	} __u6_addr;			/* 128-bit IP6 address */
  };
  #define _STRUCT_IN6_ADDR_DECLARED
  #endif
  
  #define s6_addr		__u6_addr.__u6_addr8
  #define _s6_addr16	__u6_addr.__u6_addr16		/* internal use */
  #define _s6_addr32	__u6_addr.__u6_addr32		/* internal use */
  #if __BSD_VISIBLE					/* XXX nonstandard */
  #define s6_addr8	__u6_addr.__u6_addr8
  #define s6_addr16	__u6_addr.__u6_addr16
  #define s6_addr32	__u6_addr.__u6_addr32
  #endif
  
  #define INET6_ADDRSTRLEN	46
  
  /*
   * Socket address for IPv6
   */
  #if __BSD_VISIBLE
  #define SIN6_LEN
  #endif
  
  struct sockaddr_in6 {
  	uint8_t		sin6_len;	/* length of this struct(sa_family_t)*/
  	sa_family_t	sin6_family;	/* AF_INET6 */
  	uint16_t	sin6_port;	/* Transport layer port # (in_port_t)*/
  	uint32_t	sin6_flowinfo;	/* IP6 flow information */
  	struct in6_addr	sin6_addr;	/* IP6 address */
  	uint32_t	sin6_scope_id;	/* scope zone index */
  };
  
  /*
   * Local definition for masks
   */
  #ifdef _KERNEL	/* XXX nonstandard */
  #define IN6MASK0	{{{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }}}
  #define IN6MASK32	{{{ 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, \
  			    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}}
  #define IN6MASK64	{{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, \
  			    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}}
  #define IN6MASK96	{{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, \
  			    0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 }}}
  #define IN6MASK128	{{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, \
  			    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }}}
  #endif
  
  #ifdef _KERNEL
  extern const struct sockaddr_in6 sa6_any;
  
  extern const struct in6_addr in6mask0;
  extern const struct in6_addr in6mask32;
  extern const struct in6_addr in6mask64;
  extern const struct in6_addr in6mask96;
  extern const struct in6_addr in6mask128;
  #endif /* _KERNEL */
  
  /*
   * Macros started with IPV6_ADDR is KAME local
   */
  #if BYTE_ORDER == BIG_ENDIAN
  #define _IPV6_ADDR_INT16_UL_MASK	0xffc0
  #define _IPV6_ADDR_INT16_ULL		0xfe80
  #define _IPV6_ADDR_INT16_USL		0xfec0
  #else
  #define _IPV6_ADDR_INT16_UL_MASK	0xc0ff
  #define _IPV6_ADDR_INT16_ULL		0x80fe
  #define _IPV6_ADDR_INT16_USL		0xc0fe
  #endif
  
  #ifdef _KERNEL	/* XXX nonstandard */
  #if BYTE_ORDER == BIG_ENDIAN
  #define IPV6_ADDR_INT32_ONE	1
  #define IPV6_ADDR_INT32_TWO	2
  #define IPV6_ADDR_INT32_MNL	0xff010000
  #define IPV6_ADDR_INT32_MLL	0xff020000
  #define IPV6_ADDR_INT32_SMP	0x0000ffff
  #define IPV6_ADDR_INT16_MLL	0xff02
  #elif BYTE_ORDER == LITTLE_ENDIAN
  #define IPV6_ADDR_INT32_ONE	0x01000000
  #define IPV6_ADDR_INT32_TWO	0x02000000
  #define IPV6_ADDR_INT32_MNL	0x000001ff
  #define IPV6_ADDR_INT32_MLL	0x000002ff
  #define IPV6_ADDR_INT32_SMP	0xffff0000
  #define IPV6_ADDR_INT16_MLL	0x02ff
  #endif
  #define IPV6_ADDR_INT16_ULL	_IPV6_ADDR_INT16_ULL
  #define IPV6_ADDR_INT16_USL	_IPV6_ADDR_INT16_USL
  #endif
  
  /*
   * Definition of some useful macros to handle IP6 addresses
   */
  #define IN6ADDR_ANY_INIT						\
  	{{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}}
  #define IN6ADDR_LOOPBACK_INIT						\
  	{{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
  #if __BSD_VISIBLE
  #define IN6ADDR_NODELOCAL_ALLNODES_INIT					\
  	{{{ 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
  #define IN6ADDR_INTFACELOCAL_ALLNODES_INIT				\
  	{{{ 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
  #define IN6ADDR_LINKLOCAL_ALLNODES_INIT					\
  	{{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 }}}
  #define IN6ADDR_LINKLOCAL_ALLROUTERS_INIT				\
  	{{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02 }}}
  #define IN6ADDR_LINKLOCAL_ALLMDNS_INIT					\
  	{{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		\
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfb }}}
  #endif
  
  #ifdef _KERNEL
  extern const struct in6_addr kin6addr_any;
  extern const struct in6_addr kin6addr_loopback;
  extern const struct in6_addr kin6addr_nodelocal_allnodes;
  extern const struct in6_addr kin6addr_linklocal_allnodes;
  extern const struct in6_addr kin6addr_linklocal_allrouters;
  #else
  extern const struct in6_addr in6addr_any;
  extern const struct in6_addr in6addr_loopback;
  #if __BSD_VISIBLE
  extern const struct in6_addr in6addr_nodelocal_allnodes;
  extern const struct in6_addr in6addr_linklocal_allnodes;
  #endif
  #endif
  
  #if __BSD_VISIBLE || defined(_KERNEL)
  #define IN6_ARE_ADDR_EQUAL(a, b)					\
      (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
  #endif
  
  #ifdef _KERNEL			/* non standard */
  /* see if two addresses are equal in a scope-conscious manner. */
  #define SA6_ARE_ADDR_EQUAL(a, b) \
  	(((a)->sin6_scope_id == 0 || (b)->sin6_scope_id == 0 ||		\
  	  (a)->sin6_scope_id == (b)->sin6_scope_id) &&			\
  	 (bcmp(&(a)->sin6_addr, &(b)->sin6_addr, sizeof(struct in6_addr)) == 0))
  #endif
  
  /*
   * Unspecified
   */
  #define IN6_IS_ADDR_UNSPECIFIED(a)					\
  	((a)->_s6_addr32[0] == 0 && (a)->_s6_addr32[1] == 0 &&		\
  	 (a)->_s6_addr32[2] == 0 && (a)->_s6_addr32[3] == 0)
  
  /*
   * Loopback
   */
  #define IN6_IS_ADDR_LOOPBACK(a)						\
  	((a)->_s6_addr32[0] == 0 && (a)->_s6_addr32[1] == 0 &&	\
  	 (a)->_s6_addr32[2] == 0 && (a)->_s6_addr32[3] == ntohl(1))
  
  /*
   * Mapped
   */
  #define IN6_IS_ADDR_V4MAPPED(a)						\
  	((a)->_s6_addr32[0] == 0 && (a)->_s6_addr32[1] == 0 &&		\
  	 (a)->_s6_addr32[2] == ntohl(0x0000ffff))
  
  /*
   * IPv4 compatible.  Deprecated by RFC4291.
   */
  #define IN6_IS_ADDR_V4COMPAT(a)						\
  	((a)->_s6_addr32[0] == 0 &&					\
  	 (a)->_s6_addr32[1] == 0 &&					\
  	 (a)->_s6_addr32[2] == 0 &&					\
  	 (a)->_s6_addr32[3] != 0 && (a)->_s6_addr32[3] != ntohl(1))
  
  /*
   * KAME Scope Values
   */
  
  #ifdef _KERNEL					/* XXX nonstandard */
  #define IPV6_ADDR_SCOPE_NODELOCAL	0x01
  #define IPV6_ADDR_SCOPE_INTFACELOCAL	0x01
  #define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
  #define IPV6_ADDR_SCOPE_SITELOCAL	0x05
  #define IPV6_ADDR_SCOPE_ORGLOCAL	0x08	/* just used in this file */
  #define IPV6_ADDR_SCOPE_GLOBAL		0x0e
  #else
  #define __IPV6_ADDR_SCOPE_NODELOCAL	0x01
  #define __IPV6_ADDR_SCOPE_INTFACELOCAL	0x01
  #define __IPV6_ADDR_SCOPE_LINKLOCAL	0x02
  #define __IPV6_ADDR_SCOPE_SITELOCAL	0x05
  #define __IPV6_ADDR_SCOPE_ORGLOCAL	0x08	/* just used in this file */
  #define __IPV6_ADDR_SCOPE_GLOBAL	0x0e
  #endif
  
  /*
   * Unicast Scope
   * Note that we must check topmost 10 bits only, not 16 bits (see RFC2373).
   */
  #define IN6_IS_ADDR_LINKLOCAL(a)					\
      (((a)->_s6_addr16[0] & _IPV6_ADDR_INT16_UL_MASK) == _IPV6_ADDR_INT16_ULL)
  #define IN6_IS_ADDR_SITELOCAL(a)					\
      (((a)->_s6_addr16[0] & _IPV6_ADDR_INT16_UL_MASK) == _IPV6_ADDR_INT16_USL)
  
  /*
   * Multicast
   */
  #define IN6_IS_ADDR_MULTICAST(a)	((a)->s6_addr[0] == 0xff)
  #define __IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
  #ifdef _KERNEL					/* XXX nonstandard */
  #define IPV6_ADDR_MC_SCOPE(a)		__IPV6_ADDR_MC_SCOPE(a)
  #endif
  
  /*
   * Multicast Scope
   */
  #ifdef _KERNEL
  #define IN6_IS_ADDR_MC_NODELOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_NODELOCAL))
  
  #define IN6_IS_ADDR_MC_INTFACELOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_INTFACELOCAL))
  
  #define IN6_IS_ADDR_MC_LINKLOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_LINKLOCAL))
  
  #define IN6_IS_ADDR_MC_SITELOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_SITELOCAL))
  
  #define IN6_IS_ADDR_MC_ORGLOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_ORGLOCAL))
  
  #define IN6_IS_ADDR_MC_GLOBAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_GLOBAL))
  #else
  #define IN6_IS_ADDR_MC_NODELOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_NODELOCAL))
  
  #define IN6_IS_ADDR_MC_LINKLOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_LINKLOCAL))
  
  #define IN6_IS_ADDR_MC_SITELOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_SITELOCAL))
  
  #define IN6_IS_ADDR_MC_ORGLOCAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_ORGLOCAL))
  
  #define IN6_IS_ADDR_MC_GLOBAL(a)					\
  	(IN6_IS_ADDR_MULTICAST(a) &&					\
  	 (__IPV6_ADDR_MC_SCOPE(a) == __IPV6_ADDR_SCOPE_GLOBAL))
  #endif
  
  #ifdef _KERNEL	/* nonstandard */
  /*
   * KAME Scope
   */
  #define IN6_IS_SCOPE_LINKLOCAL(a)					\
  	(IN6_IS_ADDR_LINKLOCAL(a) || IN6_IS_ADDR_MC_LINKLOCAL(a))
  #define	IN6_IS_SCOPE_EMBED(a)						\
  	((IN6_IS_ADDR_LINKLOCAL(a)) ||					\
  	 (IN6_IS_ADDR_MC_LINKLOCAL(a)) ||				\
  	 (IN6_IS_ADDR_MC_INTFACELOCAL(a)))
  
  
  #define IFA6_IS_DEPRECATED(a)						\
  	((a)->ia6_lifetime.ia6t_preferred != 0 &&			\
  	 (a)->ia6_lifetime.ia6t_preferred < time_uptime)
  
  #define IFA6_IS_INVALID(a)						\
  	((a)->ia6_lifetime.ia6t_expire != 0 &&				\
  	 (a)->ia6_lifetime.ia6t_expire < time_uptime)
  #endif
  
  /*
   * IP6 route structure
   */
  #if __BSD_VISIBLE
  struct route_in6 {
  	struct rtentry		*ro_rt;
  	struct sockaddr_in6	ro_dst;
  };
  #endif
  
  /*
   * Options for use with [gs]etsockopt at the IPV6 level.
   * First word of comment is data type; bool is stored in int.
   */
  /* no hdrincl */
  #if 0 /* the followings are relic in IPv4 and hence are disabled */
  #define IPV6_OPTIONS		1  /* buf/ip6_opts; set/get IP6 options */
  #define IPV6_RECVOPTS		5  /* bool; receive all IP6 opts w/dgram */
  #define IPV6_RECVRETOPTS	6  /* bool; receive IP6 opts for response */
  #define IPV6_RECVDSTADDR	7  /* bool; receive IP6 dst addr w/dgram */
  #define IPV6_RETOPTS		8  /* ip6_opts; set/get IP6 options */
  #endif
  #if __BSD_VISIBLE
  #define IPV6_SOCKOPT_RESERVED1	3  /* reserved for future use */
  #endif
  #define IPV6_UNICAST_HOPS	4  /* int; IP6 hops */
  #define IPV6_MULTICAST_IF	9  /* u_int; set/get IP6 multicast i/f  */
  #define IPV6_MULTICAST_HOPS	10 /* int; set/get IP6 multicast hops */
  #define IPV6_MULTICAST_LOOP	11 /* u_int; set/get IP6 multicast loopback */
  #define IPV6_JOIN_GROUP		12 /* ip6_mreq; join a group membership */
  #define IPV6_LEAVE_GROUP	13 /* ip6_mreq; leave a group membership */
  #if __BSD_VISIBLE
  #define IPV6_PORTRANGE		14 /* int; range to choose for unspec port */
  #define ICMP6_FILTER		18 /* icmp6_filter; icmp6 filter */
  #endif
  /* RFC2292 options */
  #ifdef _KERNEL
  #define IPV6_2292PKTINFO	19 /* bool; send/recv if, src/dst addr */
  #define IPV6_2292HOPLIMIT	20 /* bool; hop limit */
  #define IPV6_2292NEXTHOP	21 /* bool; next hop addr */
  #define IPV6_2292HOPOPTS	22 /* bool; hop-by-hop option */
  #define IPV6_2292DSTOPTS	23 /* bool; destinaion option */
  #define IPV6_2292RTHDR		24 /* bool; routing header */
  #define IPV6_2292PKTOPTIONS	25 /* buf/cmsghdr; set/get IPv6 options */
  #endif
  
  #if __BSD_VISIBLE
  #define IPV6_CHECKSUM		26 /* int; checksum offset for raw socket */
  #endif
  #define IPV6_V6ONLY		27 /* bool; only bind INET6 at wildcard bind */
  #ifndef _KERNEL
  #define IPV6_BINDV6ONLY		IPV6_V6ONLY
  #endif
  
  #if __BSD_VISIBLE
  #if 1 /* IPV6FIREWALL */
  #define IPV6_FW_ADD		30 /* add a firewall rule to chain */
  #define IPV6_FW_DEL		31 /* delete a firewall rule from chain */
  #define IPV6_FW_FLUSH		32 /* flush firewall rule chain */
  #define IPV6_FW_ZERO		33 /* clear single/all firewall counter(s) */
  #define IPV6_FW_GET		34 /* get entire firewall rule chain */
  #endif
  
  /* 
   * new socket options introduced in RFC3542 
   */
  #define IPV6_RTHDRDSTOPTS	35 /* ip6_dest; send dst option before rthdr */
  #define IPV6_RECVPKTINFO	36 /* bool; recv if, dst addr */
  #define IPV6_RECVHOPLIMIT	37 /* bool; recv hop limit */
  #define IPV6_RECVRTHDR		38 /* bool; recv routing header */
  #define IPV6_RECVHOPOPTS	39 /* bool; recv hop-by-hop option */
  #define IPV6_RECVDSTOPTS	40 /* bool; recv dst option after rthdr */
  #endif
  #ifdef _KERNEL
  #define IPV6_RECVRTHDRDSTOPTS	41 /* bool; recv dst option before rthdr */
  #endif
  #if __BSD_VISIBLE
  #define IPV6_USE_MIN_MTU	42 /* bool; send packets at the minimum MTU */
  #define IPV6_RECVPATHMTU	43 /* bool; notify an according MTU */
  
  /* mtuinfo; get the current path MTU (sopt),
   * 4 bytes int; MTU notification (cmsg) 
   */
  #define IPV6_PATHMTU		44 
  #if 0 /*obsoleted during 2292bis -> 3542*/
  #define IPV6_REACHCONF		45 /* no data; ND reachability confirm
  				      (cmsg only/not in of RFC3542) */
  #endif
  #define IPV6_PKTINFO		46 /* in6_pktinfo; send if, src addr */
  #define IPV6_HOPLIMIT		47 /* int; send hop limit */
  #define IPV6_NEXTHOP		48 /* sockaddr; next hop addr */
  #define IPV6_HOPOPTS		49 /* ip6_hbh; send hop-by-hop option */
  #define IPV6_DSTOPTS		50 /* ip6_dest; send dst option befor rthdr */
  #define IPV6_RTHDR		51 /* ip6_rthdr; send routing header */
  #define IPV6_PKTOPTIONS		52 /* buf/cmsghdr; set/get IPv6 options, this is obsoleted by RFC3542 */
  
  #define IPV6_RECVTCLASS		57 /* bool; recv traffic class values */
  
  #define IPV6_AUTOFLOWLABEL	59 /* bool; attach flowlabel automagically */
  
  #define IPV6_TCLASS		61 /* int; send traffic class value */
  #define IPV6_DONTFRAG		62 /* bool; disable IPv6 fragmentation */
  
  #define IPV6_PREFER_TEMPADDR	63 /* int; prefer temporary addresses as
  				    * the source address.
  				    */
  /*
   * The following option is private; do not use it from user applications.
   * It is deliberately defined to the same value as IP_MSFILTER.
   */
  #define	IPV6_MSFILTER		74 /* struct __msfilterreq;
  				    * set/get multicast source filter list.
  				    */ 
  /* to define items, should talk with KAME guys first, for *BSD compatibility */
  
  #define IPV6_RTHDR_LOOSE     0 /* this hop need not be a neighbor. XXX old spec */
  #define IPV6_RTHDR_STRICT    1 /* this hop must be a neighbor. XXX old spec */
  #define IPV6_RTHDR_TYPE_0    0 /* IPv6 routing header type 0 */
  
  /*
   * Defaults and limits for options
   */
  #define IPV6_DEFAULT_MULTICAST_HOPS 1	/* normally limit m'casts to 1 hop */
  #define IPV6_DEFAULT_MULTICAST_LOOP 1	/* normally hear sends if a member */
  #endif /* __BSD_VISIBLE */
  
  /*
   * Argument structure for IPV6_JOIN_GROUP and IPV6_LEAVE_GROUP.
   */
  struct ipv6_mreq {
  	struct in6_addr	ipv6mr_multiaddr;
  	unsigned int	ipv6mr_interface;
  };
  
  #if __BSD_VISIBLE
  /*
   * IPV6_PKTINFO: Packet information(RFC2292 sec 5)
   */
  struct in6_pktinfo {
  	struct in6_addr	ipi6_addr;	/* src/dst IPv6 address */
  	unsigned int	ipi6_ifindex;	/* send/recv interface index */
  };
  
  /*
   * New Control structure for IPV6_RECVPATHMTU socket option introduced in RFC3542.
   */
  struct ip6_mtuinfo {
  	struct sockaddr_in6 ip6m_addr;	/* or sockaddr_storage? */
  	uint32_t ip6m_mtu;
  };
  
  /*
   * Argument for IPV6_PORTRANGE:
   * - which range to search when port is unspecified at bind() or connect()
   */
  #define	IPV6_PORTRANGE_DEFAULT	0	/* default range */
  #define	IPV6_PORTRANGE_HIGH	1	/* "high" - request firewall bypass */
  #define	IPV6_PORTRANGE_LOW	2	/* "low" - vouchsafe security */
  
  /*
   * Definitions for inet6 sysctl operations.
   *
   * Third level is protocol number.
   * Fourth level is desired variable within that protocol.
   */
  #define IPV6PROTO_MAXID	(IPPROTO_PIM + 1)	/* don't list to IPV6PROTO_MAX */
  
  /*
   * Names for IP sysctl objects
   */
  #define IPV6CTL_FORWARDING	1	/* act as router */
  #define IPV6CTL_SENDREDIRECTS	2	/* may send redirects when forwarding*/
  #define IPV6CTL_DEFHLIM		3	/* default Hop-Limit */
  #ifdef notyet
  #define IPV6CTL_DEFMTU		4	/* default MTU */
  #endif
  #define IPV6CTL_FORWSRCRT	5	/* forward source-routed dgrams */
  #define IPV6CTL_STATS		6	/* stats */
  #define IPV6CTL_MRTSTATS	7	/* multicast forwarding stats */
  #define IPV6CTL_MRTPROTO	8	/* multicast routing protocol */
  #define IPV6CTL_MAXFRAGPACKETS	9	/* max packets reassembly queue */
  #define IPV6CTL_SOURCECHECK	10	/* verify source route and intf */
  #define IPV6CTL_SOURCECHECK_LOGINT 11	/* minimume logging interval */
  #define IPV6CTL_ACCEPT_RTADV	12
  #define IPV6CTL_LOG_INTERVAL	14
  #define IPV6CTL_HDRNESTLIMIT	15
  #define IPV6CTL_DAD_COUNT	16
  #define IPV6CTL_AUTO_FLOWLABEL	17
  #define IPV6CTL_DEFMCASTHLIM	18
  #define IPV6CTL_GIF_HLIM	19	/* default HLIM for gif encap packet */
  #define IPV6CTL_KAME_VERSION	20
  #define IPV6CTL_USE_DEPRECATED	21	/* use deprecated addr (RFC2462 5.5.4) */
  #define IPV6CTL_RR_PRUNE	22	/* walk timer for router renumbering */
  #if 0	/* obsolete */
  #define IPV6CTL_MAPPED_ADDR	23
  #define IPV6CTL_V6ONLY		24
  #endif
  #define IPV6CTL_RTEXPIRE	25	/* cloned route expiration time */
  #define IPV6CTL_RTMINEXPIRE	26	/* min value for expiration time */
  #define IPV6CTL_RTMAXCACHE	27	/* trigger level for dynamic expire */
  
  #define IPV6CTL_USETEMPADDR	32	/* use temporary addresses (RFC3041) */
  #define IPV6CTL_TEMPPLTIME	33	/* preferred lifetime for tmpaddrs */
  #define IPV6CTL_TEMPVLTIME	34	/* valid lifetime for tmpaddrs */
  #define IPV6CTL_AUTO_LINKLOCAL	35	/* automatic link-local addr assign */
  #define IPV6CTL_RIP6STATS	36	/* raw_ip6 stats */
  
  #define IPV6CTL_ADDRCTLPOLICY	38	/* get/set address selection policy */
  #define IPV6CTL_MINHLIM		39	/* minimum Hop-Limit */
  
  #define IPV6CTL_MAXFRAGS	41	/* max fragments */
  
  /* New entries should be added here from current IPV6CTL_MAXID value. */
  /* to define items, should talk with KAME guys first, for *BSD compatibility */
  
  #define	ICMPV6CTL_ND6_ONLINKNSRFC4861	47
  #define IPV6CTL_MAXID		48
  
  /*
   * Redefinition of mbuf flags
   */
  #define	M_AUTHIPHDR	M_PROTO2
  #define	M_DECRYPTED	M_PROTO3
  #define	M_LOOP		M_PROTO4
  #define	M_AUTHIPDGM	M_PROTO5
  #endif /* __BSD_VISIBLE */
  
  #ifdef _KERNEL
  
  struct ifnet;
  struct mbuf;
  struct sockaddr;
  struct sockaddr_in;
  struct sockaddr_in6;
  
  int	in6_cksum (struct mbuf *, uint8_t, uint32_t, uint32_t);
  int	in6_localaddr (struct in6_addr *);
  int	in6_addrscope (struct in6_addr *);
  struct	in6_ifaddr *in6_ifawithscope (struct ifnet *, struct in6_addr *, struct ucred *);
  struct	in6_ifaddr *in6_ifawithifp (struct ifnet *, struct in6_addr *);
  
  void	addrsel_policy_init (void);
  
  #define	satosin6(sa)	((struct sockaddr_in6 *)(sa))
  #define	sin6tosa(sin6)	((struct sockaddr *)(sin6))
  #define	ifatoia6(ifa)	((struct in6_ifaddr *)(ifa))
  #endif /* _KERNEL */
  
  #if __BSD_VISIBLE
  __BEGIN_DECLS
  struct cmsghdr;
  
  uint8_t *inet6_option_alloc (struct cmsghdr *, int, int, int);
  int inet6_option_append (struct cmsghdr *, const uint8_t *, int, int);
  int inet6_option_find (const struct cmsghdr *, uint8_t **, int);
  int inet6_option_init (void *, struct cmsghdr **, int);
  int inet6_option_next (const struct cmsghdr *, uint8_t **);
  int inet6_option_space (int);
  
  int inet6_opt_append (void *, socklen_t, int, uint8_t, socklen_t, uint8_t, void **);
  int inet6_opt_find (void *, socklen_t, int, uint8_t, socklen_t *, void **);
  int inet6_opt_finish (void *, socklen_t, int);
  int inet6_opt_get_val (void *, int, void *, socklen_t);
  int inet6_opt_init (void *, socklen_t);
  int inet6_opt_next (void *, socklen_t, int, uint8_t *, socklen_t *, void **);
  int inet6_opt_set_val (void *, int, void *, socklen_t);
  
  int		 inet6_rth_add (void *, const struct in6_addr *);
  struct in6_addr *inet6_rth_getaddr (const void *, int);
  void		*inet6_rth_init (void *, socklen_t, int, int);
  int		 inet6_rth_reverse (const void *, void *);
  int		 inet6_rth_segments (const void *);
  socklen_t	 inet6_rth_space (int, int);
  
  int		 inet6_rthdr_add (struct cmsghdr *, const struct in6_addr *,
  				  unsigned int);
  struct in6_addr *inet6_rthdr_getaddr (struct cmsghdr *, int);
  int		 inet6_rthdr_getflags (const struct cmsghdr *, int);
  struct cmsghdr	*inet6_rthdr_init (void *, int);
  int		 inet6_rthdr_lasthop (struct cmsghdr *, unsigned int);
  int		 inet6_rthdr_reverse (const struct cmsghdr *, struct cmsghdr *);
  int		 inet6_rthdr_segments (const struct cmsghdr *);
  size_t		 inet6_rthdr_space (int, int);
  __END_DECLS
  #endif /* __BSD_VISIBLE */
  
  #endif /* !_NETINET6_IN6_H_ */
  