in6.h

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 *
 *	$KAME: in6.h,v 1.89 2001/05/27 13:28:35 itojun Exp $
 */

/*-
 * 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.
 */

#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/cvsweb.cgi/kame/COVERAGE
 * has the table of implementation/integration differences.
 */
#define __KAME__
#define __KAME_VERSION		"FreeBSD"

/*
 * IPv6 port allocation rules should mirror the IPv4 rules and are controlled
 * by the net.inet.ip.portrange sysctl tree. The following defines exist
 * for compatibility with userland applications that need them.
 */
#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
 */
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 s6_addr   __u6_addr.__u6_addr8
#if __BSD_VISIBLE
/*
 * s6_addr is the only in6_addr element specified in RFCs 2553 and 3493,
 * also in POSIX 1003.1-2017.  The following three definitions were not
 * exposed to user programs in FreeBSD before 14.1, or in other BSDs,
 * and are thus less portable than s6_addr.
 */
#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

/*
 * XXX missing POSIX.1-2001 macro IPPROTO_IPV6.
 */

/*
 * 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	sin6_family;	/* AF_INET6 */
	in_port_t	sin6_port;	/* Transport layer port # */
	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
 */
#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_ULL	0xfe80
#define IPV6_ADDR_INT16_USL	0xfec0
#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_ULL	0x80fe
#define IPV6_ADDR_INT16_USL	0xc0fe
#define IPV6_ADDR_INT16_MLL	0x02ff
#endif
#endif

/*
 * Definition of some useful macros to handle IP6 addresses
 */
#if __BSD_VISIBLE
#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 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT \
	{{{ 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16 }}}
#endif

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;
extern const struct in6_addr in6addr_linklocal_allrouters;
extern const struct in6_addr in6addr_linklocal_allv2routers;
#endif

/*
 * Equality
 */
#if __BSD_VISIBLE
#define IN6_ARE_ADDR_EQUAL(a, b)			\
    (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
#endif

/*
 * Unspecified
 */
#define IN6_IS_ADDR_UNSPECIFIED(a)	\
	((a)->__u6_addr.__u6_addr32[0] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[1] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[2] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[3] == 0)

/*
 * Loopback
 */
#define IN6_IS_ADDR_LOOPBACK(a)		\
	((a)->__u6_addr.__u6_addr32[0] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[1] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[2] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[3] == ntohl(1))

/*
 * IPv4 compatible
 */
#define IN6_IS_ADDR_V4COMPAT(a)		\
	((a)->__u6_addr.__u6_addr32[0] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[1] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[2] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[3] != 0 &&	\
	 (a)->__u6_addr.__u6_addr32[3] != ntohl(1))

/*
 * Mapped
 */
#define IN6_IS_ADDR_V4MAPPED(a)		      \
	((a)->__u6_addr.__u6_addr32[0] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[1] == 0 &&	\
	 (a)->__u6_addr.__u6_addr32[2] == ntohl(0x0000ffff))

/*
 * 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_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 IN6_IS_ADDR_MULTICAST(a)	((a)->s6_addr[0] == 0xff)

#ifdef _KERNEL	/* XXX nonstandard */
#define IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
#else
#define __IPV6_ADDR_MC_SCOPE(a)		((a)->s6_addr[1] & 0x0f)
#endif

/*
 * Multicast Scope
 */
#ifdef _KERNEL	/* refers nonstandard items */
#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_pltime != ND6_INFINITE_LIFETIME && \
	 (u_int32_t)((time_uptime - (a)->ia6_updatetime)) >= \
	 (a)->ia6_lifetime.ia6t_pltime)
#define IFA6_IS_INVALID(a) \
	((a)->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME && \
	 (u_int32_t)((time_uptime - (a)->ia6_updatetime)) >= \
	 (a)->ia6_lifetime.ia6t_vltime)
#endif /* _KERNEL */

/*
 * IP6 route structure
 */
#if __BSD_VISIBLE
struct nhop_object;
struct route_in6 {
	struct nhop_object *ro_nh;
	struct	llentry *ro_lle;
	/*
	 * ro_prepend and ro_plen are only used for bpf to pass in a
	 * preformed header.  They are not cacheable.
	 */
	char		*ro_prepend;
	uint16_t	ro_plen;
	uint16_t	ro_flags;
	uint16_t	ro_mtu;	/* saved ro_rt mtu */
	uint16_t	spare;
	struct	sockaddr_in6 ro_dst;
};
#endif

#ifdef _KERNEL
#define MTAG_ABI_IPV6		1444287380	/* IPv6 ABI */
#define IPV6_TAG_DIRECT		0		/* direct-dispatch IPv6 */
#endif /* _KERNEL */

/*
 * 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
#define IPV6_SOCKOPT_RESERVED1	3  /* reserved for future use */
#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 /* ipv6_mreq; join a group membership */
#define IPV6_LEAVE_GROUP	13 /* ipv6_mreq; leave a group membership */
#define IPV6_PORTRANGE		14 /* int; range to choose for unspec port */
#define ICMP6_FILTER		18 /* icmp6_filter; icmp6 filter */
/* 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

#define IPV6_CHECKSUM		26 /* int; checksum offset for raw socket */
#define IPV6_V6ONLY		27 /* bool; make AF_INET6 sockets v6 only */
#ifndef _KERNEL
#define IPV6_BINDV6ONLY		IPV6_V6ONLY
#endif

#define IPV6_IPSEC_POLICY	28 /* struct; get/set security policy */
				   /* 29; unused; was IPV6_FAITH */
#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 */
#ifdef _KERNEL
#define IPV6_RECVRTHDRDSTOPTS	41 /* bool; recv dst option before rthdr */
#endif

#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) */
#if 0 /*obsoleted during 2292bis -> 3542*/
#define IPV6_REACHCONF		45 /* no data; ND reachability confirm
				      (cmsg only/not in of RFC3542) */
#endif

/* 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 befor rthdr */
#define IPV6_RTHDR		51 /* ip6_rthdr; send routing header */
#if 0
#define IPV6_PKTOPTIONS		52 /* buf/cmsghdr; set/get IPv6 options */
				   /* obsoleted by RFC3542 */
#endif

#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.
				    */

#define	IPV6_BINDANY		64 /* bool: allow bind to any address */
				   /* unused; was IPV6_BIND_MULTI */
				   /* unused; was IPV6_RSS_LISTEN_BUCKET */
#define	IPV6_FLOWID		67 /* int; flowid of given socket */
#define	IPV6_FLOWTYPE		68 /* int; flowtype of given socket */
#define	IPV6_RSSBUCKETID	69 /* int; RSS bucket ID of given socket */
#define	IPV6_RECVFLOWID		70 /* bool; receive IP6 flowid/flowtype w/ datagram */
#define	IPV6_RECVRSSBUCKETID	71 /* bool; receive IP6 RSS bucket id w/ datagram */

#define	IPV6_ORIGDSTADDR	72 /* bool: allow getting dstaddr /port info */
#define	IPV6_RECVORIGDSTADDR	IPV6_ORIGDSTADDR

/*
 * 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.
				    */

/* The following option deals with the 802.1Q Ethernet Priority Code Point */
#define	IPV6_VLAN_PCP		75  /* int; set/get PCP used for packet, */
				    /*      -1 use interface default */

/* 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 */

/*
 * Limit for IPv6 multicast memberships
 */
#define	IPV6_MAX_MEMBERSHIPS	4095

/*
 * Default resource limits for IPv6 multicast source filtering.
 * These may be modified by sysctl.
 */
#define	IPV6_MAX_GROUP_SRC_FILTER	512	/* sources per group */
#define	IPV6_MAX_SOCK_SRC_FILTER	128	/* sources per socket/group */

/*
 * 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(RFC2292 sec 5)
 */
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.
 */
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 */

#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_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
					/* 13; unused; was: IPV6CTL_KEEPFAITH */
#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
#endif
#define IPV6CTL_V6ONLY		24
/*	IPV6CTL_RTEXPIRE	25	deprecated */
/*	IPV6CTL_RTMINEXPIRE	26	deprecated */
/*	IPV6CTL_RTMAXCACHE	27	deprecated */

#define IPV6CTL_STABLEADDR_NETIFSRC	30	/* semantically opaque addresses (RFC7217) hash algo netif parameter src */
#define IPV6CTL_STABLEADDR_MAXRETRIES	31	/* semantically opaque addresses (RFC7217) max DAD retries */
#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_PREFER_TEMPADDR	37	/* prefer temporary addr as src */
#define IPV6CTL_ADDRCTLPOLICY	38	/* get/set address selection policy */
#define IPV6CTL_USE_DEFAULTZONE	39	/* use default scope zone */
#define IPV6CTL_USESTABLEADDR	40	/* use semantically opaque addresses (RFC7217) */

#define IPV6CTL_MAXFRAGS	41	/* max fragments */
#if 0
#define IPV6CTL_IFQ		42	/* ip6intrq node */
#define IPV6CTL_ISATAPRTR	43	/* isatap router */
#endif
#define IPV6CTL_MCAST_PMTU	44	/* enable pMTU discovery for multicast? */

/* 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_STEALTH		45

#define	ICMPV6CTL_ND6_ONLINKNSRFC4861	47
#define	IPV6CTL_NO_RADR		48	/* No defroute from RA */
#define	IPV6CTL_NORBIT_RAIF	49	/* Disable R-bit in NA on RA
					 * receiving IF. */
#define	IPV6CTL_RFC6204W3	50	/* Accept defroute even when forwarding
					   enabled */
#define	IPV6CTL_INTRQMAXLEN	51	/* max length of IPv6 netisr queue */
#define	IPV6CTL_INTRDQMAXLEN	52	/* max length of direct IPv6 netisr
					 * queue */
#define	IPV6CTL_MAXFRAGSPERPACKET	53 /* Max fragments per packet */
#define	IPV6CTL_MAXFRAGBUCKETSIZE	54 /* Max reassembly queues per bucket */
#define	IPV6CTL_MAXID		55
#endif /* __BSD_VISIBLE */

/*
 * Since both netinet/ and netinet6/ call into netipsec/ and netpfil/,
 * the protocol specific mbuf flags are shared between them.
 */
#define	M_FASTFWD_OURS		M_PROTO1	/* changed dst to local */
#define	M_IP6_NEXTHOP		M_PROTO2	/* explicit ip nexthop */
#define	M_IP_NEXTHOP		M_PROTO2	/* explicit ip nexthop */
#define	M_SKIP_FIREWALL		M_PROTO3	/* skip firewall processing */
#define	M_AUTHIPHDR		M_PROTO4
#define	M_DECRYPTED		M_PROTO5
#define	M_LOOP			M_PROTO6
#define	M_AUTHIPDGM		M_PROTO7
#define	M_RTALERT_MLD		M_PROTO8
#define	M_FRAGMENTED		M_PROTO9	/* contained fragment header */

#ifdef _KERNEL
struct cmsghdr;
struct ip6_hdr;

int	in6_cksum(struct mbuf *, uint8_t, uint32_t, uint32_t);
int	in6_cksum_partial(struct mbuf *, uint8_t, uint32_t, uint32_t, uint32_t);
int	in6_cksum_partial_l2(struct mbuf *m, uint8_t nxt, uint32_t off_l3,
	    uint32_t off_l4, uint32_t len, uint32_t cov);
int	in6_cksum_pseudo(struct ip6_hdr *, uint32_t, uint8_t, uint16_t);

int	in6_localaddr(struct in6_addr *);
int	in6_localip(struct in6_addr *);
bool	in6_localip_fib(struct in6_addr *, uint16_t);
int	in6_ifhasaddr(struct ifnet *, struct in6_addr *);
int	in6_addrscope(const struct in6_addr *);
char	*ip6_sprintf(char *, const struct in6_addr *);
struct	in6_ifaddr *in6_ifawithifp(struct ifnet *, struct in6_addr *);
extern void in6_if_up(struct ifnet *);
struct sockaddr;

void	in6_sin6_2_sin(struct sockaddr_in *sin,
	    const struct sockaddr_in6 *sin6);
void	in6_sin_2_v4mapsin6(const struct sockaddr_in *sin,
	    struct sockaddr_in6 *sin6);
void	in6_sin6_2_sin_in_sock(struct sockaddr *nam);
extern 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 */

#ifndef _SIZE_T_DECLARED
typedef	__size_t	size_t;
#define	_SIZE_T_DECLARED
#endif

#ifndef _SOCKLEN_T_DECLARED
typedef	__socklen_t	socklen_t;
#define	_SOCKLEN_T_DECLARED
#endif

#if __BSD_VISIBLE

__BEGIN_DECLS
struct cmsghdr;

extern int inet6_option_space(int);
extern int inet6_option_init(void *, struct cmsghdr **, int);
extern int inet6_option_append(struct cmsghdr *, const uint8_t *,
	int, int);
extern uint8_t *inet6_option_alloc(struct cmsghdr *, int, int, int);
extern int inet6_option_next(const struct cmsghdr *, uint8_t **);
extern int inet6_option_find(const struct cmsghdr *, uint8_t **, int);

extern size_t inet6_rthdr_space(int, int);
extern struct cmsghdr *inet6_rthdr_init(void *, int);
extern int inet6_rthdr_add(struct cmsghdr *, const struct in6_addr *,
	unsigned int);
extern int inet6_rthdr_lasthop(struct cmsghdr *, unsigned int);
#if 0 /* not implemented yet */
extern int inet6_rthdr_reverse(const struct cmsghdr *, struct cmsghdr *);
#endif
extern int inet6_rthdr_segments(const struct cmsghdr *);
extern struct in6_addr *inet6_rthdr_getaddr(struct cmsghdr *, int);
extern int inet6_rthdr_getflags(const struct cmsghdr *, int);

extern int inet6_opt_init(void *, socklen_t);
extern int inet6_opt_append(void *, socklen_t, int, uint8_t, socklen_t,
	uint8_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, uint8_t *, socklen_t *,
	void **);
extern int inet6_opt_find(void *, socklen_t, int, uint8_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_ */