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ip6.h

/* @(#) $Header: /tcpdump/master/tcpdump/ip6.h,v 1.6 2002/12/11 22:29:21 guy Exp $ (LBL) */
/*    $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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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_

/*
 * 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

/* in network endian */
#define IPV6_FLOWINFO_MASK    ((u_int32_t)htonl(0x0fffffff))      /* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK   ((u_int32_t)htonl(0x000fffff))      /* flow label (20 bits) */
#if 1
/* ECN bits proposed by Sally Floyd */
#define IP6TOS_CE       0x01  /* congestion experienced */
#define IP6TOS_ECT            0x02  /* ECN-capable transport */
#endif

/*
 * Extension Headers
 */

struct      ip6_ext {
      u_char      ip6e_nxt;
      u_char      ip6e_len;
};

/* Hop-by-Hop options header */
/* XXX should we pad it to force alignment on an 8-byte boundary? */
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 */
/* XXX should we pad it to force alignment on an 8-byte boundary? */
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_JUMBO_LEN      6
#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_BINDING_UPDATE 0xc6  /* 11 0 00110 */
#define IP6OPT_BINDING_ACK    0x07  /* 00 0 00111 */
#define IP6OPT_BINDING_REQ    0x08  /* 00 0 01000 */
#define IP6OPT_HOME_ADDRESS   0xc9  /* 11 0 01001 */
#define IP6OPT_EID            0x8a  /* 10 0 01010 */

#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 {
      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_int8_t  ip6r0_reserved;     /* reserved field */
      u_int8_t  ip6r0_slmap[3];     /* strict/loose bit map */
      struct in6_addr ip6r0_addr[1];      /* up to 23 addresses */
};

/* 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 */
};

#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 _NETINET_IP6_H_ */

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