/*      NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp      */
/*      $KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun Exp $     */

/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 1982, 1986, 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 ND_IP6_H_
#define ND_IP6_H_

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

struct ip6_hdr {
       union {
               struct ip6_hdrctl {
                       nd_uint32_t ip6_un1_flow;       /* 20 bits of flow-ID */
                       nd_uint16_t ip6_un1_plen;       /* payload length */
                       nd_uint8_t  ip6_un1_nxt;        /* next header */
                       nd_uint8_t  ip6_un1_hlim;       /* hop limit */
               } ip6_un1;
               nd_uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
       } ip6_ctlun;
       nd_ipv6 ip6_src;        /* source address */
       nd_ipv6 ip6_dst;        /* destination address */
};

#define ip6_vfc         ip6_ctlun.ip6_un2_vfc
#define IP6_VERSION(ip6_hdr)    ((GET_U_1((ip6_hdr)->ip6_vfc) & 0xf0) >> 4)
#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

/* in network endian */
#define IPV6_FLOWINFO_MASK      ((uint32_t)htonl(0x0fffffff))   /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK     ((uint32_t)htonl(0x000fffff))   /* flow label (20 bits) */

/*
* Extension Headers
*/

struct  ip6_ext {
       nd_uint8_t ip6e_nxt;
       nd_uint8_t ip6e_len;
};

/* Hop-by-Hop options header */
struct ip6_hbh {
       nd_uint8_t ip6h_nxt;    /* next header */
       nd_uint8_t ip6h_len;    /* length in units of 8 octets */
       /* followed by options */
};

/* Destination options header */
struct ip6_dest {
       nd_uint8_t ip6d_nxt;    /* next header */
       nd_uint8_t ip6d_len;    /* length in units of 8 octets */
       /* followed by options */
};

/* https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml */

/* 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_JUMBO_LEN        6
#define IP6OPT_RPL              0x63    /* 01 1 00011 */
#define IP6OPT_TUN_ENC_LIMIT    0x04    /* 00 0 00100 */
#define IP6OPT_ROUTER_ALERT     0x05    /* 00 0 00101 */

#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_QUICK_START      0x26    /* 00 1 00110 */
#define IP6OPT_CALIPSO          0x07    /* 00 0 00111 */
#define IP6OPT_SMF_DPD          0x08    /* 00 0 01000 */
#define IP6OPT_HOME_ADDRESS     0xc9    /* 11 0 01001 */
#define IP6OPT_HOMEADDR_MINLEN  18
#define IP6OPT_EID              0x8a    /* 10 0 01010 */
#define IP6OPT_ILNP_NOTICE      0x8b    /* 10 0 01011 */
#define IP6OPT_LINE_ID          0x8c    /* 10 0 01100 */
#define IP6OPT_MPL              0x6d    /* 01 1 01101 */
#define IP6OPT_IP_DFF           0xee    /* 11 1 01110 */

#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

/* Routing header */
struct ip6_rthdr {
       nd_uint8_t  ip6r_nxt;           /* next header */
       nd_uint8_t  ip6r_len;           /* length in units of 8 octets */
       nd_uint8_t  ip6r_type;          /* routing type */
       nd_uint8_t  ip6r_segleft;       /* segments left */
       /* followed by routing type specific data */
};

#define IPV6_RTHDR_TYPE_0 0
#define IPV6_RTHDR_TYPE_2 2
#define IPV6_RTHDR_TYPE_4 4

/* Type 0 Routing header */
/* Also used for Type 2 */
struct ip6_rthdr0 {
       nd_uint8_t  ip6r0_nxt;          /* next header */
       nd_uint8_t  ip6r0_len;          /* length in units of 8 octets */
       nd_uint8_t  ip6r0_type;         /* always zero */
       nd_uint8_t  ip6r0_segleft;      /* segments left */
       nd_uint32_t ip6r0_reserved;     /* reserved field */
       nd_ipv6     ip6r0_addr[1];      /* up to 23 addresses */
};

/**
* Type 4 Routing header
* known as Segment Routing Header 'SRH'
*/
struct ip6_srh {
       nd_uint8_t      srh_nxt;                /* next header */
       nd_uint8_t      srh_len;                /* length in units of 8 octets */
       nd_uint8_t      srh_type;               /* Routing Type 4 */
       nd_uint8_t      srh_segleft;            /* segments left */
       nd_uint8_t      srh_last_ent;           /* Last Entry*/
       nd_uint8_t      srh_flags;              /* Flags */
       nd_uint16_t     srh_tag;                /* Tag */
       nd_ipv6         srh_segments[1];        /* SRH segments list*/
};

/* Fragment header */
struct ip6_frag {
       nd_uint8_t  ip6f_nxt;           /* next header */
       nd_uint8_t  ip6f_reserved;      /* reserved field */
       nd_uint16_t ip6f_offlg;         /* offset, reserved, and flag */
       nd_uint32_t ip6f_ident;         /* identification */
};

#define IP6F_OFF_MASK           0xfff8  /* mask out offset from ip6f_offlg */
#define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */

#endif /* not ND_IP6_H_ */

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