dist/tcpdump/ip6.h

   1 /*      $NetBSD$        */
   2
   3 /* @(#) Header: /tcpdump/master/tcpdump/ip6.h,v 1.6.4.1 2005/04/20 10:04:37 guy Exp (LBL) */
   4 /*      NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp      */
   5 /*      $KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun Exp $     */
   6
   7 /*
   8  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the project nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * Copyright (c) 1982, 1986, 1993
  38  *      The Regents of the University of California.  All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  *
  64  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
  65  */
  66
  67 #ifndef _NETINET_IP6_H_
  68 #define _NETINET_IP6_H_
  69
  70 /*
  71  * Definition for internet protocol version 6.
  72  * RFC 2460
  73  */
  74
  75 struct ip6_hdr {
  76         union {
  77                 struct ip6_hdrctl {
  78                         u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
  79                         u_int16_t ip6_un1_plen; /* payload length */
  80                         u_int8_t  ip6_un1_nxt;  /* next header */
  81                         u_int8_t  ip6_un1_hlim; /* hop limit */
  82                 } ip6_un1;
  83                 u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
  84         } ip6_ctlun;
  85         struct in6_addr ip6_src;        /* source address */
  86         struct in6_addr ip6_dst;        /* destination address */
  87 };
  88
  89 #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
  90 #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
  91 #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
  92 #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
  93 #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
  94 #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
  95
  96 /* in network endian */
  97 #define IPV6_FLOWINFO_MASK      ((u_int32_t)htonl(0x0fffffff))  /* flow info (28 bits) */
  98 #define IPV6_FLOWLABEL_MASK     ((u_int32_t)htonl(0x000fffff))  /* flow label (20 bits) */
  99 #if 1
 100 /* ECN bits proposed by Sally Floyd */
 101 #define IP6TOS_CE               0x01    /* congestion experienced */
 102 #define IP6TOS_ECT              0x02    /* ECN-capable transport */
 103 #endif
 104
 105 /*
 106  * Extension Headers
 107  */
 108
 109 struct  ip6_ext {
 110         u_char  ip6e_nxt;
 111         u_char  ip6e_len;
 112 };
 113
 114 /* Hop-by-Hop options header */
 115 /* XXX should we pad it to force alignment on an 8-byte boundary? */
 116 struct ip6_hbh {
 117         u_int8_t ip6h_nxt;      /* next header */
 118         u_int8_t ip6h_len;      /* length in units of 8 octets */
 119         /* followed by options */
 120 };
 121
 122 /* Destination options header */
 123 /* XXX should we pad it to force alignment on an 8-byte boundary? */
 124 struct ip6_dest {
 125         u_int8_t ip6d_nxt;      /* next header */
 126         u_int8_t ip6d_len;      /* length in units of 8 octets */
 127         /* followed by options */
 128 };
 129
 130 /* Option types and related macros */
 131 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
 132 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
 133 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
 134 #define IP6OPT_JUMBO_LEN        6
 135 #define IP6OPT_ROUTER_ALERT     0x05    /* 00 0 00101 */
 136
 137 #define IP6OPT_RTALERT_LEN      4
 138 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
 139 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
 140 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
 141 #define IP6OPT_MINLEN           2
 142
 143 #define IP6OPT_BINDING_UPDATE   0xc6    /* 11 0 00110 */
 144 #define IP6OPT_BINDING_ACK      0x07    /* 00 0 00111 */
 145 #define IP6OPT_BINDING_REQ      0x08    /* 00 0 01000 */
 146 #define IP6OPT_HOME_ADDRESS     0xc9    /* 11 0 01001 */
 147 #define IP6OPT_EID              0x8a    /* 10 0 01010 */
 148
 149 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
 150 #define IP6OPT_TYPE_SKIP        0x00
 151 #define IP6OPT_TYPE_DISCARD     0x40
 152 #define IP6OPT_TYPE_FORCEICMP   0x80
 153 #define IP6OPT_TYPE_ICMP        0xC0
 154
 155 #define IP6OPT_MUTABLE          0x20
 156
 157 /* Routing header */
 158 struct ip6_rthdr {
 159         u_int8_t  ip6r_nxt;     /* next header */
 160         u_int8_t  ip6r_len;     /* length in units of 8 octets */
 161         u_int8_t  ip6r_type;    /* routing type */
 162         u_int8_t  ip6r_segleft; /* segments left */
 163         /* followed by routing type specific data */
 164 };
 165
 166 /* Type 0 Routing header */
 167 struct ip6_rthdr0 {
 168         u_int8_t  ip6r0_nxt;            /* next header */
 169         u_int8_t  ip6r0_len;            /* length in units of 8 octets */
 170         u_int8_t  ip6r0_type;           /* always zero */
 171         u_int8_t  ip6r0_segleft;        /* segments left */
 172         u_int8_t  ip6r0_reserved;       /* reserved field */
 173         u_int8_t  ip6r0_slmap[3];       /* strict/loose bit map */
 174         struct in6_addr ip6r0_addr[1];  /* up to 23 addresses */
 175 };
 176
 177 /* Fragment header */
 178 struct ip6_frag {
 179         u_int8_t  ip6f_nxt;             /* next header */
 180         u_int8_t  ip6f_reserved;        /* reserved field */
 181         u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
 182         u_int32_t ip6f_ident;           /* identification */
 183 };
 184
 185 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from ip6f_offlg */
 186 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
 187 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
 188
 189 #endif /* not _NETINET_IP6_H_ */