/* packet-ipv6.h
 * Definitions for IPv6 packet disassembly
 *
 * 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 __PACKET_IPV6_H_DEFINED__
#define __PACKET_IPV6_H_DEFINED__

#include <epan/ipv6.h>

/*
 * Definition for internet protocol version 6.
 * RFC 2460
 */
struct ip6_hdr {
    union {
        struct ip6_hdrctl {
            guint32 ip6_un1_flow;    /* version, class, flow */
            guint16 ip6_un1_plen;    /* payload length */
            guint8  ip6_un1_nxt;     /* next header */
            guint8  ip6_un1_hlim;    /* hop limit */
        } ip6_un1;
        guint8 ip6_un2_vfc;          /* 4 bits version, 4 bits class */
    } ip6_ctlun;
    struct e_in6_addr ip6_src;       /* source address */
    struct e_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

/* Offsets of fields within an IPv6 header. */
#define IP6H_CTL        0
#define IP6H_CTL_FLOW   0
#define IP6H_CTL_PLEN   4
#define IP6H_CTL_NXT    6
#define IP6H_CTL_HLIM   7
#define IP6H_CTL_VFC    0
#define IP6H_SRC        8
#define IP6H_DST        24

#define IPV6_FLOWINFO_MASK  0x0fffffff/* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK 0x000fffff/* flow label (20 bits) */

/*
 * 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 */
};

/* SHIM6 header */
struct ip6_shim {
    guint8  ip6s_nxt; /* next header */
    guint8  ip6s_len; /* header extension length */
    guint8  ip6s_p;   /* P field and first 7 bits of remainder */
    /* followed by shim6 specific data*/
};

#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 */

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

gboolean capture_ipv6(const guchar *, int, int, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __PACKET_IPV6_H_DEFINED__ */

/*
 * Editor modelines
 *
 * Local Variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */