/*      $NetBSD: in6.h,v 1.101 2021/07/31 10:12:04 andvar 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 _NETINET6_IN6_H_
#define _NETINET6_IN6_H_

#include <sys/featuretest.h>

#ifndef __KAME_NETINET_IN_H_INCLUDED_
#error "do not include netinet6/in6.h directly, include netinet/in.h.  see RFC2553"
#endif

#include <sys/socket.h>
#include <sys/endian.h>         /* ntohl */

/*
 * 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          "NetBSD-current"

/*
 * 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 defined(_NETBSD_SOURCE)
#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
#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

#define INET6_ADDRSTRLEN        46

/*
 * Socket address for IPv6
 */
#if defined(_NETBSD_SOURCE)
#define SIN6_LEN
#endif
struct sockaddr_in6 {
        uint8_t         sin6_len;       /* length of this struct(socklen_t)*/
        sa_family_t     sin6_family;    /* AF_INET6 (sa_family_t) */
        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
 */
#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_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 }}}

extern const struct in6_addr in6addr_any;
extern const struct in6_addr in6addr_loopback;
extern const struct in6_addr in6addr_nodelocal_allnodes;
extern const struct in6_addr in6addr_linklocal_allnodes;
extern const struct in6_addr in6addr_linklocal_allrouters;

#define IN6_ARE_ADDR_EQUAL(a, b)                        \
    (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)

/*
 * 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_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_EMBEDDABLE(__a)    \
    (IN6_IS_SCOPE_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

/*
 * 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
/* These are deprecated non-standard options which are no longer supported. */
#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 */
/* The join and leave membership option numbers need to match with the v4 ones */
#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 defined(_NETBSD_SOURCE)
#define IPV6_PORTALGO           17 /* int; port selection algo (rfc6056) */
#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; destination 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 */

#define IPV6_IPSEC_POLICY       28 /* struct; get/set security policy */
#define IPV6_FAITH              29 /* bool; accept FAITH'ed connections */

/* 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) */

/* 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_RECVTCLASS         57 /* bool; recv traffic class values */
#ifdef _KERNEL
#define IPV6_OTCLASS            58 /* u_int8_t; send traffic class value */
#endif

#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 address as
                                    * the source address */
#define IPV6_BINDANY            64 /* bool: allow bind to any address */
/* 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  */

/*
 * 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 defined(_NETBSD_SOURCE)
/*
 * Definitions for inet6 sysctl operations.
 *
 * Third level is protocol number.
 * Fourth level is desired variable within that protocol.
 */
/*
 * 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 */
/* IPV6CTL_DEFMTU=4, never implemented */
#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 */
/* 12 was IPV6CTL_ACCEPT_RTADV */
#define IPV6CTL_KEEPFAITH       13
#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) */
/* 22 was IPV6CTL_RR_PRUNE */
/* 23: reserved */
#define IPV6CTL_V6ONLY          24
/* 25 to 27: reserved */
#define IPV6CTL_ANONPORTMIN     28      /* minimum ephemeral port */
#define IPV6CTL_ANONPORTMAX     29      /* maximum ephemeral port */
#define IPV6CTL_LOWPORTMIN      30      /* minimum reserved port */
#define IPV6CTL_LOWPORTMAX      31      /* maximum reserved port */
/* 32 to 34: reserved */
#define IPV6CTL_AUTO_LINKLOCAL  35      /* automatic link-local addr assign */
/* 36 to 37: reserved */
#define IPV6CTL_ADDRCTLPOLICY   38      /* get/set address selection policy */
#define IPV6CTL_USE_DEFAULTZONE 39      /* use default scope zone */
/* 40: reserved */
#define IPV6CTL_MAXFRAGS        41      /* max fragments */
#define IPV6CTL_IFQ             42      /* IPv6 packet input queue */
/* 43 was IPV6CTL_RTADV_MAXROUTES */
/* 44 was IPV6CTL_RTADV_NUMROUTES */
#define IPV6CTL_GIF_PMTU        45      /* gif(4) Path MTU setting */
#define IPV6CTL_IPSEC_HLIM      46      /* default HLIM for ipsecif encap packet */
#define IPV6CTL_IPSEC_PMTU      47      /* ipsecif(4) Path MTU setting */
#endif /* _NETBSD_SOURCE */

#ifdef _KERNEL
struct cmsghdr;

/*
 * in6_cksum_phdr:
 *
 *      Compute significant parts of the IPv6 checksum pseudo-header
 *      for use in a delayed TCP/UDP checksum calculation.
 *
 *      Args:
 *
 *              src             Source IPv6 address
 *              dst             Destination IPv6 address
 *              len             htonl(proto-hdr-len)
 *              nxt             htonl(next-proto-number)
 *
 *      NOTE: We expect the src and dst addresses to be 16-bit
 *      aligned!
 */
static __inline u_int16_t __unused
in6_cksum_phdr(const struct in6_addr *src, const struct in6_addr *dst,
    u_int32_t len, u_int32_t nxt)
{
        u_int32_t sum = 0;
        const u_int16_t *w;

        /*LINTED*/
        w = (const u_int16_t *) src;
        sum += w[0];
        if (!IN6_IS_SCOPE_LINKLOCAL(src))
                sum += w[1];
        sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5];
        sum += w[6]; sum += w[7];

        /*LINTED*/
        w = (const u_int16_t *) dst;
        sum += w[0];
        if (!IN6_IS_SCOPE_LINKLOCAL(dst))
                sum += w[1];
        sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5];
        sum += w[6]; sum += w[7];

        sum += (u_int16_t)(len >> 16) + (u_int16_t)(len /*& 0xffff*/);

        sum += (u_int16_t)(nxt >> 16) + (u_int16_t)(nxt /*& 0xffff*/);

        sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);

        if (sum > 0xffff)
                sum -= 0xffff;

        return (sum);
}

struct mbuf;
struct ifnet;
int sockaddr_in6_cmp(const struct sockaddr *, const struct sockaddr *);
struct sockaddr *sockaddr_in6_externalize(struct sockaddr *, socklen_t,
    const struct sockaddr *);
int     in6_cksum(struct mbuf *, u_int8_t, u_int32_t, u_int32_t);
int     in6_localaddr(const struct in6_addr *);
int     in6_addrscope(const struct in6_addr *);
struct  in6_ifaddr *in6_ifawithifp(struct ifnet *, struct in6_addr *);
extern void in6_if_link_up(struct ifnet *);
extern void in6_if_link_down(struct ifnet *);
extern void in6_if_link_state_change(struct ifnet *, int);
extern void in6_if_up(struct ifnet *);
extern void in6_if_down(struct ifnet *);
extern void addrsel_policy_init(void);
extern  u_char  ip6_protox[];

struct ip6_hdr;
int in6_tunnel_validate(const struct ip6_hdr *, const struct in6_addr *,
        const struct in6_addr *);

#define satosin6(sa)    ((struct sockaddr_in6 *)(sa))
#define satocsin6(sa)   ((const struct sockaddr_in6 *)(sa))
#define sin6tosa(sin6)  ((struct sockaddr *)(sin6))
#define sin6tocsa(sin6) ((const struct sockaddr *)(sin6))
#define ifatoia6(ifa)   ((struct in6_ifaddr *)(ifa))

static __inline void
sockaddr_in6_init1(struct sockaddr_in6 *sin6, const struct in6_addr *addr,
    in_port_t port, uint32_t flowinfo, uint32_t scope_id)
{
        sin6->sin6_port = port;
        sin6->sin6_flowinfo = flowinfo;
        sin6->sin6_addr = *addr;
        sin6->sin6_scope_id = scope_id;
}

static __inline void
sockaddr_in6_init(struct sockaddr_in6 *sin6, const struct in6_addr *addr,
    in_port_t port, uint32_t flowinfo, uint32_t scope_id)
{
        sin6->sin6_family = AF_INET6;
        sin6->sin6_len = sizeof(*sin6);
        sockaddr_in6_init1(sin6, addr, port, flowinfo, scope_id);
}

static __inline struct sockaddr *
sockaddr_in6_alloc(const struct in6_addr *addr, in_port_t port,
    uint32_t flowinfo, uint32_t scope_id, int flags)
{
        struct sockaddr *sa;

        if ((sa = sockaddr_alloc(AF_INET6, sizeof(struct sockaddr_in6),
            flags)) == NULL)
                return NULL;

        sockaddr_in6_init1(satosin6(sa), addr, port, flowinfo, scope_id);

        return sa;
}
#endif /* _KERNEL */

#if defined(_NETBSD_SOURCE)

#include <machine/ansi.h>

#ifdef  _BSD_SIZE_T_
typedef _BSD_SIZE_T_            size_t;
#define _SIZE_T
#undef  _BSD_SIZE_T_
#endif

#include <sys/cdefs.h>

__BEGIN_DECLS
struct cmsghdr;

void    in6_in_2_v4mapin6(const struct in_addr *, struct in6_addr *);
void    in6_sin6_2_sin(struct sockaddr_in *, struct sockaddr_in6 *);
void    in6_sin_2_v4mapsin6(const struct sockaddr_in *, struct sockaddr_in6 *);
void    in6_sin6_2_sin_in_sock(struct sockaddr *);
void    in6_sin_2_v4mapsin6_in_sock(struct sockaddr **);

#define INET6_IS_ADDR_LINKLOCAL         1
#define INET6_IS_ADDR_MC_LINKLOCAL      2
#define INET6_IS_ADDR_SITELOCAL         4
void    inet6_getscopeid(struct sockaddr_in6 *, int);
void    inet6_putscopeid(struct sockaddr_in6 *, int);

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 /* _NETBSD_SOURCE */

#if defined(_KERNEL) || defined(_TEST)
int     in6_print(char *, size_t, const struct in6_addr *);
#define IN6_PRINT(b, a) (in6_print((b), sizeof(b), (a)), (b))
int     sin6_print(char *, size_t, const void *);
#endif

#endif /* !_NETINET6_IN6_H_ */