/*      $NetBSD: ip6.h,v 1.30 2021/03/07 15:01:00 christos Exp $        */
/*      $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi 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, 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.
*
*      @(#)ip.h        8.1 (Berkeley) 6/10/93
*/

#ifndef _NETINET_IP6_H_
#define _NETINET_IP6_H_

#include <sys/types.h>
#include <sys/endian.h>

#include <netinet/in.h>

/*
* Definition for internet protocol version 6.
* RFC 2460
*/

struct ip6_hdr {
       union {
               struct ip6_hdrctl {
                       u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
                       u_int16_t ip6_un1_plen; /* payload length */
                       u_int8_t  ip6_un1_nxt;  /* next header */
                       u_int8_t  ip6_un1_hlim; /* hop limit */
               } ip6_un1;
               u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
       } ip6_ctlun;
       struct in6_addr ip6_src;        /* source address */
       struct in6_addr ip6_dst;        /* destination address */
};

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

#define IPV6_VERSION            0x60
#define IPV6_VERSION_MASK       0xf0

#if BYTE_ORDER == BIG_ENDIAN
#define IPV6_FLOWINFO_MASK      0x0fffffff      /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK     0x000fffff      /* flow label (20 bits) */
#else
#if BYTE_ORDER == LITTLE_ENDIAN
#define IPV6_FLOWINFO_MASK      0xffffff0f      /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK     0xffff0f00      /* flow label (20 bits) */
#endif /* LITTLE_ENDIAN */
#endif
#if 1
/* ECN bits proposed by Sally Floyd */
#define IP6TOS_CE               0x01    /* congestion experienced */
#define IP6TOS_ECT              0x02    /* ECN-capable transport */
#endif

#ifdef _KERNEL
/*
* for IPv6 pseudo header checksum
* XXX nonstandard
*/
struct ip6_hdr_pseudo {
       struct in6_addr ip6ph_src;
       struct in6_addr ip6ph_dst;
       u_int32_t       ip6ph_len;
       u_int8_t        ip6ph_zero[3];
       u_int8_t        ip6ph_nxt;
};
__CTASSERT(sizeof(struct ip6_hdr) == 40);
__CTASSERT(sizeof(struct ip6_hdr_pseudo) == 40);
#endif

/*
* Extension Headers
*/

struct ip6_ext {
       u_int8_t ip6e_nxt;
       u_int8_t ip6e_len;
};

/* Hop-by-Hop options header */
struct ip6_hbh {
       u_int8_t ip6h_nxt;      /* next header */
       u_int8_t ip6h_len;      /* length in units of 8 octets */
       /* followed by options */
};

/* Destination options header */
struct ip6_dest {
       u_int8_t ip6d_nxt;      /* next header */
       u_int8_t ip6d_len;      /* length in units of 8 octets */
       /* followed by options */
};

/* Option types and related macros */
#define IP6OPT_PAD1             0x00    /* 00 0 00000 */
#define IP6OPT_PADN             0x01    /* 00 0 00001 */
#define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
#define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
#define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
#define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
#define IP6OPT_ROUTER_ALERT     0x05    /* (RFC3542 def, recommended) */

#define IP6OPT_RTALERT_LEN      4
#define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
#define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
#define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
#define IP6OPT_MINLEN           2

#define IP6OPT_TYPE(o)          ((o) & 0xC0)
#define IP6OPT_TYPE_SKIP        0x00
#define IP6OPT_TYPE_DISCARD     0x40
#define IP6OPT_TYPE_FORCEICMP   0x80
#define IP6OPT_TYPE_ICMP        0xC0

#define IP6OPT_MUTABLE          0x20

/* IPv6 options: common part */
struct ip6_opt {
       u_int8_t ip6o_type;
       u_int8_t ip6o_len;
};

/* Jumbo Payload Option */
struct ip6_opt_jumbo {
       u_int8_t ip6oj_type;
       u_int8_t ip6oj_len;
       u_int8_t ip6oj_jumbo_len[4];
};
#define IP6OPT_JUMBO_LEN 6

/* NSAP Address Option */
struct ip6_opt_nsap {
       u_int8_t ip6on_type;
       u_int8_t ip6on_len;
       u_int8_t ip6on_src_nsap_len;
       u_int8_t ip6on_dst_nsap_len;
       /* followed by source NSAP */
       /* followed by destination NSAP */
};

/* Tunnel Limit Option */
struct ip6_opt_tunnel {
       u_int8_t ip6ot_type;
       u_int8_t ip6ot_len;
       u_int8_t ip6ot_encap_limit;
};

/* Router Alert Option */
struct ip6_opt_router {
       u_int8_t ip6or_type;
       u_int8_t ip6or_len;
       u_int8_t ip6or_value[2];
};
/* Router alert values (in network byte order) */
#if BYTE_ORDER == BIG_ENDIAN
#define IP6_ALERT_MLD   0x0000
#define IP6_ALERT_RSVP  0x0001
#define IP6_ALERT_AN    0x0002
#else
#if BYTE_ORDER == LITTLE_ENDIAN
#define IP6_ALERT_MLD   0x0000
#define IP6_ALERT_RSVP  0x0100
#define IP6_ALERT_AN    0x0200
#endif /* LITTLE_ENDIAN */
#endif

/* Routing header */
struct ip6_rthdr {
       u_int8_t ip6r_nxt;      /* next header */
       u_int8_t ip6r_len;      /* length in units of 8 octets */
       u_int8_t ip6r_type;     /* routing type */
       u_int8_t ip6r_segleft;  /* segments left */
       /* followed by routing type specific data */
};

/* Type 0 Routing header */
struct ip6_rthdr0 {
       u_int8_t  ip6r0_nxt;            /* next header */
       u_int8_t  ip6r0_len;            /* length in units of 8 octets */
       u_int8_t  ip6r0_type;           /* always zero */
       u_int8_t  ip6r0_segleft;        /* segments left */
       u_int32_t ip6r0_reserved;       /* reserved field */
};

/* Fragment header */
struct ip6_frag {
       u_int8_t  ip6f_nxt;             /* next header */
       u_int8_t  ip6f_reserved;        /* reserved field */
       u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
       u_int32_t ip6f_ident;           /* identification */
};

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

/*
* Internet implementation parameters.
*/
#define IPV6_MAXHLIM    255     /* maximum hoplimit */
#define IPV6_DEFHLIM    64      /* default hlim */
#define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
#define IPV6_HLIMDEC    1       /* subtracted when forwarding */

#define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
#define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/

#ifdef _KERNEL
#define IP6_EXTHDR_GET(val, typ, m, off, len) \
       M_REGION_GET(val, typ, m, off, len)
#endif /*_KERNEL*/

#endif /* !_NETINET_IP6_H_ */

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