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IABSD.fr/src/sys/netinet6/in6.h

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  • Author : florian
    Date : 2025-09-16 09:19:16
    Hash : 36cb1096
    Message : There is no reason not to do flowlabels. Remove net.inet6.ip6.auto_flowlabel knob. OK sthen, bluhm

  • sys/netinet6/in6.h
  • /*	$OpenBSD: in6.h,v 1.125 2025/09/16 09:19:16 florian Exp $	*/
    /*	$KAME: in6.h,v 1.83 2001/03/29 02:55:07 jinmei 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_
    
    /*
     * Identification of the network protocol stack
     * for *BSD-current/release: http://www.kame.net/dev/cvsweb2.cgi/kame/COVERAGE
     * has the table of implementation/integration differences.
     */
    #define __KAME__
    
    /*
     * IPv6 address
     */
    struct in6_addr {
    	union {
    		u_int8_t   __u6_addr8[16];
    		u_int16_t  __u6_addr16[8];
    		u_int32_t  __u6_addr32[4];
    	} __u6_addr;			/* 128-bit IP6 address */
    };
    
    #define s6_addr   __u6_addr.__u6_addr8
    #ifdef _KERNEL	/* XXX nonstandard */
    #define s6_addr8  __u6_addr.__u6_addr8
    #define s6_addr16 __u6_addr.__u6_addr16
    #define s6_addr32 __u6_addr.__u6_addr32
    #endif
    
    #ifndef INET6_ADDRSTRLEN
    #define INET6_ADDRSTRLEN	46
    #endif
    
    /*
     * Socket address for IPv6
     */
    #if __BSD_VISIBLE
    #define SIN6_LEN	/* Indicates sockaddr_in6 has a sin6_len field */
    #endif /* __BSD_VISIBLE */
    struct sockaddr_in6 {
    	u_int8_t	sin6_len;	/* length of this struct(sa_family_t)*/
    	sa_family_t	sin6_family;	/* AF_INET6 (sa_family_t) */
    	in_port_t	sin6_port;	/* Transport layer port # (in_port_t)*/
    	u_int32_t	sin6_flowinfo;	/* IP6 flow information */
    	struct in6_addr	sin6_addr;	/* IP6 address */
    	u_int32_t	sin6_scope_id;	/* intface scope id */
    };
    
    
    /*
     * 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 }}}
    
    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 */
    
    /* Both kernel and libc define these for use */
    extern const struct in6_addr in6addr_any;
    extern const struct in6_addr in6addr_loopback;
    extern const struct in6_addr in6addr_intfacelocal_allnodes;
    extern const struct in6_addr in6addr_linklocal_allnodes;
    extern const struct in6_addr in6addr_linklocal_allrouters;
    
    #if __BSD_VISIBLE
    /*
     * 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 }}}
    #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 IN6_ARE_ADDR_EQUAL(a, b)			\
        (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
    
    #endif /* __BSD_VISIBLE */
    
    /*
     * Macros started with IPV6_ADDR is KAME local
     */
    #define __IPV6_ADDR_INT32_ONE	htonl(1)
    #define __IPV6_ADDR_INT32_TWO	htonl(2)
    #define __IPV6_ADDR_INT32_MNL	htonl(0xff010000)
    #define __IPV6_ADDR_INT32_MLL	htonl(0xff020000)
    #define __IPV6_ADDR_INT32_SMP	htonl(0x0000ffff)
    #define __IPV6_ADDR_INT16_ULL	htons(0xfe80)
    #define __IPV6_ADDR_INT16_USL	htons(0xfec0)
    #define __IPV6_ADDR_INT16_MLL	htons(0xff02)
    
    /*
     * Unspecified
     */
    #define IN6_IS_ADDR_UNSPECIFIED(a)	\
    	((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) == 0))
    
    /*
     * Loopback
     */
    #define IN6_IS_ADDR_LOOPBACK(a)		\
    	((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) == __IPV6_ADDR_INT32_ONE))
    
    /*
     * IPv4 compatible
     */
    #define IN6_IS_ADDR_V4COMPAT(a)		\
    	((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) != 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[12]) != __IPV6_ADDR_INT32_ONE))
    
    /*
     * Mapped
     */
    #define IN6_IS_ADDR_V4MAPPED(a)		      \
    	((*(const u_int32_t *)(const void *)(&(a)->s6_addr[0]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[4]) == 0) &&	\
    	 (*(const u_int32_t *)(const void *)(&(a)->s6_addr[8]) == __IPV6_ADDR_INT32_SMP))
    
    /*
     * Unicast Scope
     * Note that we must check topmost 10 bits only, not 16 bits (see RFC2373).
     */
    #define IN6_IS_ADDR_LINKLOCAL(a)	\
    	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))
    #define IN6_IS_ADDR_SITELOCAL(a)	\
    	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0xc0))
    
    /*
     * Multicast
     */
    #define __IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
    #define IN6_IS_ADDR_MULTICAST(a)	((a)->s6_addr[0] == 0xff)
    
    #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
    
    #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))
    
    #ifdef _KERNEL
    #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_pltime != ND6_INFINITE_LIFETIME && \
    	 (u_int32_t)((getuptime() - (a)->ia6_updatetime)) > \
    	 (a)->ia6_lifetime.ia6t_pltime)
    #define IFA6_IS_INVALID(a) \
    	((a)->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME && \
    	 (u_int32_t)((getuptime() - (a)->ia6_updatetime)) > \
    	 (a)->ia6_lifetime.ia6t_vltime)
    
    #endif /* _KERNEL */
    
    /*
     * Options for use with [gs]etsockopt at the IPV6 level.
     * First word of comment is data type; bool is stored in int.
     */
    #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 /* u_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 */
    #define IPV6_PORTRANGE		14 /* int; range to choose for unspec port */
    #if __BSD_VISIBLE
    #define ICMP6_FILTER		18 /* icmp6_filter; icmp6 filter */
    #endif
    
    #define IPV6_CHECKSUM		26 /* int; checksum offset for raw socket */
    #define IPV6_V6ONLY		27 /* bool; make AF_INET6 sockets v6 only */
    
    /* 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 */
    
    #define IPV6_USE_MIN_MTU	42 /* bool; send packets at the minimum MTU */
    #define IPV6_RECVPATHMTU	43 /* bool; notify an according MTU */
    
    #define IPV6_PATHMTU		44 /* mtuinfo; get the current path MTU (sopt),
    				      4 bytes int; MTU notification (cmsg) */
    
    /* More new socket options introduced in RFC3542 */
    #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 before rthdr */
    #define IPV6_RTHDR		51 /* ip6_rthdr; send routing header */
    
    #define IPV6_AUTH_LEVEL		53   /* int; authentication used */
    #define IPV6_ESP_TRANS_LEVEL	54   /* int; transport encryption */
    #define IPV6_ESP_NETWORK_LEVEL	55   /* int; full-packet encryption */
    #if __BSD_VISIBLE
    #define IPSEC6_OUTSA		56   /* set the outbound SA for a socket */
    #endif
    #define IPV6_RECVTCLASS		57   /* bool; recv traffic class values */
    
    #define IPV6_AUTOFLOWLABEL	59   /* bool; attach flowlabel automagically */
    #define IPV6_IPCOMP_LEVEL	60   /* int; compression */
    
    #define IPV6_TCLASS		61   /* int; send traffic class value */
    #define IPV6_DONTFRAG		62   /* bool; disable IPv6 fragmentation */
    #define IPV6_PIPEX		63   /* bool; using PIPEX */
    
    #define IPV6_RECVDSTPORT	64   /* bool; receive IP dst port w/dgram */
    #define IPV6_MINHOPCOUNT	65   /* int; minimum recv hop limit */
    
    #define IPV6_RTABLE		0x1021	/* int; routing table, see SO_RTABLE */
    
    /* to define items, should talk with KAME guys first, for *BSD compatibility */
    #define IPV6_RTHDR_LOOSE	0	/* this hop need not be a neighbor */
    #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 */
    
    /*
     * Argument structure for IPV6_JOIN_GROUP and IPV6_LEAVE_GROUP.
     */
    struct ipv6_mreq {
    	struct in6_addr	ipv6mr_multiaddr;
    	unsigned int	ipv6mr_interface;
    };
    
    /*
     * IPV6_PKTINFO: Packet information(RFC3542 sec 6)
     */
    struct in6_pktinfo {
    	struct in6_addr	ipi6_addr;	/* src/dst IPv6 address */
    	unsigned int	ipi6_ifindex;	/* send/recv interface index */
    };
    
    /*
     * Control structure for IPV6_RECVPATHMTU socket option.
     * XXX Not allowed here by POSIX, but required by RFC 3542, so go
     * XXX with the code on the pavement.
     */
    struct ip6_mtuinfo {
    	struct sockaddr_in6 ip6m_addr;	/* or sockaddr_storage? */
    	u_int32_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 */
    
    #ifdef __BSD_VISIBLE
    
    #ifndef	_SOCKLEN_T_DEFINED_
    #define	_SOCKLEN_T_DEFINED_
    typedef	__socklen_t	socklen_t;	/* length type for network syscalls */
    #endif
    
    #endif /* __BSD_VISIBLE */
    
    #ifdef _KERNEL
    extern const u_char inet6ctlerrmap[];
    extern const struct in6_addr zeroin6_addr;
    
    struct mbuf;
    struct sockaddr;
    struct sockaddr_in6;
    struct ifaddr;
    struct in6_ifaddr;
    struct ifnet;
    struct rtentry;
    struct netstack;
    
    void	ipv6_input(struct ifnet *, struct mbuf *, struct netstack *);
    struct mbuf *
    	ipv6_check(struct ifnet *, struct mbuf *);
    
    int	in6_cksum(struct mbuf *, uint8_t, uint32_t, uint32_t);
    void	in6_proto_cksum_out(struct mbuf *, struct ifnet *);
    int	in6_addrscope(const struct in6_addr *);
    struct	in6_ifaddr *in6_ifawithscope(struct ifnet *, const struct in6_addr *,
    	    u_int, struct rtentry *);
    int	in6_mask2len(struct in6_addr *, u_char *);
    int	in6_nam2sin6(const struct mbuf *, struct sockaddr_in6 **);
    int	in6_sa2sin6(struct sockaddr *, struct sockaddr_in6 **);
    
    struct ip6_pktopts;
    struct ip6_moptions;
    
    int	in6_embedscope(struct in6_addr *, const struct sockaddr_in6 *,
    	    const struct ip6_pktopts *, const struct ip6_moptions *);
    void	in6_recoverscope(struct sockaddr_in6 *, const struct in6_addr *);
    void	in6_clearscope(struct in6_addr *);
    
    /*
     * Convert between address family specific and general structs.
     * Inline functions check the source type and are stricter than
     * casts or defines.
     */
    
    static inline struct sockaddr_in6 *
    satosin6(struct sockaddr *sa)
    {
    	return ((struct sockaddr_in6 *)(sa));
    }
    
    static inline const struct sockaddr_in6 *
    satosin6_const(const struct sockaddr *sa)
    {
    	return ((const struct sockaddr_in6 *)(sa));
    }
    
    static inline struct sockaddr *
    sin6tosa(struct sockaddr_in6 *sin6)
    {
    	return ((struct sockaddr *)(sin6));
    }
    
    static inline const struct sockaddr *
    sin6tosa_const(const struct sockaddr_in6 *sin6)
    {
    	return ((const struct sockaddr *)(sin6));
    }
    
    static inline struct in6_ifaddr *
    ifatoia6(struct ifaddr *ifa)
    {
    	return ((struct in6_ifaddr *)(ifa));
    }
    
    #endif /* _KERNEL */
    
    #if __BSD_VISIBLE
    /*
     * Definitions for inet6 sysctl operations.
     *
     * Third level is protocol number.
     * Fourth level is desired variable within that protocol.
     */
    #define IPV6PROTO_MAXID	(IPPROTO_DIVERT + 1)	/* don't list to IPV6PROTO_MAX */
    
    #define CTL_IPV6PROTO_NAMES { \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, \
    	{ "tcp6", CTLTYPE_NODE }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "udp6", CTLTYPE_NODE }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, \
    	{ "ip6", CTLTYPE_NODE }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, \
    	{ "ipsec6", CTLTYPE_NODE }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "icmp6", CTLTYPE_NODE }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    /*110*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*120*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*130*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*140*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*150*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*160*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*170*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*180*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*190*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*200*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*210*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*220*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*230*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*240*/	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    	{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
    /*250*/	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "divert", CTLTYPE_NODE }, \
    }
    
    /*
     * 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 */
    #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	/* minimum 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
    /* 24 to 40: reserved */
    #define IPV6CTL_MAXFRAGS	41	/* max fragments */
    #define IPV6CTL_MFORWARDING	42
    #define IPV6CTL_MULTIPATH	43
    #define IPV6CTL_MCAST_PMTU	44	/* path MTU discovery for multicast */
    #define IPV6CTL_NEIGHBORGCTHRESH 45
    #define IPV6CTL_MAXDYNROUTES	48
    #define IPV6CTL_DAD_PENDING	49
    #define IPV6CTL_MTUDISCTIMEOUT	50
    #define IPV6CTL_IFQUEUE		51
    #define IPV6CTL_MRTMIF		52
    #define IPV6CTL_MRTMFC		53
    #define IPV6CTL_MAXID		54
    
    /* New entries should be added here from current IPV6CTL_MAXID value. */
    /* to define items, should talk with KAME guys first, for *BSD compatibility */
    
    #define IPV6CTL_NAMES { \
    	{ 0, 0 }, \
    	{ "forwarding", CTLTYPE_INT }, \
    	{ "redirect", CTLTYPE_INT }, \
    	{ "hlim", CTLTYPE_INT }, \
    	{ 0, 0 }, \
    	{ "forwsrcrt", CTLTYPE_INT }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "mrtproto", CTLTYPE_INT }, \
    	{ "maxfragpackets", CTLTYPE_INT }, \
    	{ "sourcecheck", CTLTYPE_INT }, \
    	{ "sourcecheck_logint", CTLTYPE_INT }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "hdrnestlimit", CTLTYPE_INT }, \
    	{ "dad_count", CTLTYPE_INT }, \
    	{ 0, 0 }, \
    	{ "defmcasthlim", CTLTYPE_INT }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "maxfrags", CTLTYPE_INT }, \
    	{ "mforwarding", CTLTYPE_INT }, \
    	{ "multipath", CTLTYPE_INT }, \
    	{ "multicast_mtudisc", CTLTYPE_INT }, \
    	{ "neighborgcthresh", CTLTYPE_INT }, \
    	{ 0, 0 }, \
    	{ 0, 0 }, \
    	{ "maxdynroutes", CTLTYPE_INT }, \
    	{ "dad_pending", CTLTYPE_INT }, \
    	{ "mtudisctimeout", CTLTYPE_INT }, \
    	{ "ifq", CTLTYPE_NODE }, \
    	{ "mrtmif", CTLTYPE_STRUCT }, \
    	{ "mrtmfc", CTLTYPE_STRUCT }, \
    }
    
    __BEGIN_DECLS
    struct cmsghdr;
    
    extern int inet6_opt_init(void *, socklen_t);
    extern int inet6_opt_append(void *, socklen_t, int, u_int8_t,
    		socklen_t, u_int8_t, void **);
    extern int inet6_opt_finish(void *, socklen_t, int);
    extern int inet6_opt_set_val(void *, int, void *, socklen_t);
    
    extern int inet6_opt_next(void *, socklen_t, int, u_int8_t *,
    		socklen_t *, void **);
    extern int inet6_opt_find(void *, socklen_t, int, u_int8_t,
    		socklen_t *, void **);
    extern int inet6_opt_get_val(void *, int, void *, socklen_t);
    
    extern socklen_t inet6_rth_space(int, int);
    extern void *inet6_rth_init(void *, socklen_t, int, int);
    extern int inet6_rth_add(void *, const struct in6_addr *);
    extern int inet6_rth_reverse(const void *, void *);
    extern int inet6_rth_segments(const void *);
    extern struct in6_addr *inet6_rth_getaddr(const void *, int);
    __END_DECLS
    #endif /* __BSD_VISIBLE */
    
    #endif /* !_NETINET6_IN6_H_ */