/* inet_ipv6.h
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef __INET_IPV6_H__
#define __INET_IPV6_H__

#include <glib.h>

#define IPv6_ADDR_SIZE  16

#define IPv6_HDR_SIZE           40
#define IPv6_FRAGMENT_HDR_SIZE  8

struct e_in6_addr {
    guint8 bytes[16];           /* 128 bit IPv6 address */
};

/*
 * Definition for internet protocol version 6.
 * RFC 2460
 */
struct ws_ip6_hdr {
    guint32     ip6h_vc_flow;           /* version, class, flow */
    guint16     ip6h_plen;              /* payload length */
    guint8      ip6h_nxt;               /* next header */
    guint8      ip6h_hlim;              /* hop limit */
    struct e_in6_addr ip6h_src;         /* source address */
    struct e_in6_addr ip6h_dst;         /* destination address */
};

/*
 * Extension Headers
 */

struct ip6_ext {
    guchar ip6e_nxt;
    guchar ip6e_len;
};

/* Routing header */
struct ip6_rthdr {
    guint8 ip6r_nxt;        /* next header */
    guint8 ip6r_len;        /* length in units of 8 octets */
    guint8 ip6r_type;       /* routing type */
    guint8 ip6r_segleft;    /* segments left */
    /* followed by routing type specific data */
};

/* Type 0 Routing header */
struct ip6_rthdr0 {
    guint8 ip6r0_nxt;       /* next header */
    guint8 ip6r0_len;       /* length in units of 8 octets */
    guint8 ip6r0_type;      /* always zero */
    guint8 ip6r0_segleft;   /* segments left */
    guint8 ip6r0_reserved;  /* reserved field */
    guint8 ip6r0_slmap[3];  /* strict/loose bit map */
    /* followed by up to 127 addresses */
    struct e_in6_addr ip6r0_addr[1];
};

/* Fragment header */
struct ip6_frag {
    guint8  ip6f_nxt;       /* next header */
    guint8  ip6f_reserved;  /* reserved field */
    guint16 ip6f_offlg;     /* offset, reserved, and flag */
    guint32 ip6f_ident;     /* identification */
};

#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 */


/**
 * Unicast Scope
 * Note that we must check topmost 10 bits only, not 16 bits (see RFC2373).
 */
static inline gboolean in6_is_addr_linklocal(const struct e_in6_addr *a)
{
    return (a->bytes[0] == 0xfe) && ((a->bytes[1] & 0xc0) == 0x80);
}

static inline gboolean in6_is_addr_sitelocal(const struct e_in6_addr *a)
{
    return (a->bytes[0] == 0xfe) && ((a->bytes[1] & 0xc0) == 0xc0);
}

/**
 * Multicast
 */
static inline gboolean in6_is_addr_multicast(const struct e_in6_addr *a)
{
    return a->bytes[0] == 0xff;
}

#endif