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   1 /*      NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp      */
   2 /*      $KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun Exp $     */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Copyright (c) 1982, 1986, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
  66  */
  67
  68 #ifndef ND_IP6_H_
  69 #define ND_IP6_H_
  70
  71 /*
  72  * Definition for internet protocol version 6.
  73  * RFC 2460
  74  */
  75
  76 struct ip6_hdr {
  77         union {
  78                 struct ip6_hdrctl {
  79                         nd_uint32_t ip6_un1_flow;       /* 20 bits of flow-ID */
  80                         nd_uint16_t ip6_un1_plen;       /* payload length */
  81                         nd_uint8_t  ip6_un1_nxt;        /* next header */
  82                         nd_uint8_t  ip6_un1_hlim;       /* hop limit */
  83                 } ip6_un1;
  84                 nd_uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
  85         } ip6_ctlun;
  86         nd_ipv6 ip6_src;        /* source address */
  87         nd_ipv6 ip6_dst;        /* destination address */
  88 };
  89
  90 #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
  91 #define IP6_VERSION(ip6_hdr)    ((GET_U_1((ip6_hdr)->ip6_vfc) & 0xf0) >> 4)
  92 #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
  93 #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
  94 #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
  95 #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
  96 #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
  97
  98 /* in network endian */
  99 #define IPV6_FLOWINFO_MASK      ((uint32_t)htonl(0x0fffffff))   /* flow info (28 bits) */
 100 #define IPV6_FLOWLABEL_MASK     ((uint32_t)htonl(0x000fffff))   /* flow label (20 bits) */
 101
 102 /*
 103  * Extension Headers
 104  */
 105
 106 struct  ip6_ext {
 107         nd_uint8_t ip6e_nxt;
 108         nd_uint8_t ip6e_len;
 109 };
 110
 111 /* Hop-by-Hop options header */
 112 struct ip6_hbh {
 113         nd_uint8_t ip6h_nxt;    /* next header */
 114         nd_uint8_t ip6h_len;    /* length in units of 8 octets */
 115         /* followed by options */
 116 };
 117
 118 /* Destination options header */
 119 struct ip6_dest {
 120         nd_uint8_t ip6d_nxt;    /* next header */
 121         nd_uint8_t ip6d_len;    /* length in units of 8 octets */
 122         /* followed by options */
 123 };
 124
 125 /* https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml */
 126
 127 /* Option types and related macros */
 128 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
 129 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
 130 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
 131 #define IP6OPT_JUMBO_LEN        6
 132 #define IP6OPT_RPL              0x63    /* 01 1 00011 */
 133 #define IP6OPT_TUN_ENC_LIMIT    0x04    /* 00 0 00100 */
 134 #define IP6OPT_ROUTER_ALERT     0x05    /* 00 0 00101 */
 135
 136 #define IP6OPT_RTALERT_LEN      4
 137 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
 138 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
 139 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
 140 #define IP6OPT_MINLEN           2
 141
 142 #define IP6OPT_QUICK_START      0x26    /* 00 1 00110 */
 143 #define IP6OPT_CALIPSO          0x07    /* 00 0 00111 */
 144 #define IP6OPT_SMF_DPD          0x08    /* 00 0 01000 */
 145 #define IP6OPT_HOME_ADDRESS     0xc9    /* 11 0 01001 */
 146 #define IP6OPT_HOMEADDR_MINLEN  18
 147 #define IP6OPT_EID              0x8a    /* 10 0 01010 */
 148 #define IP6OPT_ILNP_NOTICE      0x8b    /* 10 0 01011 */
 149 #define IP6OPT_LINE_ID          0x8c    /* 10 0 01100 */
 150 #define IP6OPT_MPL              0x6d    /* 01 1 01101 */
 151 #define IP6OPT_IP_DFF           0xee    /* 11 1 01110 */
 152
 153 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
 154 #define IP6OPT_TYPE_SKIP        0x00
 155 #define IP6OPT_TYPE_DISCARD     0x40
 156 #define IP6OPT_TYPE_FORCEICMP   0x80
 157 #define IP6OPT_TYPE_ICMP        0xC0
 158
 159 #define IP6OPT_MUTABLE          0x20
 160
 161 /* Routing header */
 162 struct ip6_rthdr {
 163         nd_uint8_t  ip6r_nxt;           /* next header */
 164         nd_uint8_t  ip6r_len;           /* length in units of 8 octets */
 165         nd_uint8_t  ip6r_type;          /* routing type */
 166         nd_uint8_t  ip6r_segleft;       /* segments left */
 167         /* followed by routing type specific data */
 168 };
 169
 170 #define IPV6_RTHDR_TYPE_0 0
 171 #define IPV6_RTHDR_TYPE_2 2
 172 #define IPV6_RTHDR_TYPE_4 4
 173
 174 /* Type 0 Routing header */
 175 /* Also used for Type 2 */
 176 struct ip6_rthdr0 {
 177         nd_uint8_t  ip6r0_nxt;          /* next header */
 178         nd_uint8_t  ip6r0_len;          /* length in units of 8 octets */
 179         nd_uint8_t  ip6r0_type;         /* always zero */
 180         nd_uint8_t  ip6r0_segleft;      /* segments left */
 181         nd_uint32_t ip6r0_reserved;     /* reserved field */
 182         nd_ipv6     ip6r0_addr[1];      /* up to 23 addresses */
 183 };
 184
 185 /**
 186  * Type 4 Routing header
 187  * known as Segment Routing Header 'SRH'
 188  */
 189 struct ip6_srh {
 190         nd_uint8_t      srh_nxt;                /* next header */
 191         nd_uint8_t      srh_len;                /* length in units of 8 octets */
 192         nd_uint8_t      srh_type;               /* Routing Type 4 */
 193         nd_uint8_t      srh_segleft;            /* segments left */
 194         nd_uint8_t      srh_last_ent;           /* Last Entry*/
 195         nd_uint8_t      srh_flags;              /* Flags */
 196         nd_uint16_t     srh_tag;                /* Tag */
 197         nd_ipv6         srh_segments[1];        /* SRH segments list*/
 198 };
 199
 200 #define IPV6_SRH_TLV_PAD1 0
 201 #define IPV6_SRH_TLV_PADN 4
 202 #define IPV6_SRH_TLV_HMAC 5
 203
 204 /* Fragment header */
 205 struct ip6_frag {
 206         nd_uint8_t  ip6f_nxt;           /* next header */
 207         nd_uint8_t  ip6f_reserved;      /* reserved field */
 208         nd_uint16_t ip6f_offlg;         /* offset, reserved, and flag */
 209         nd_uint32_t ip6f_ident;         /* identification */
 210 };
 211
 212 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from ip6f_offlg */
 213 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
 214 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
 215
 216 #endif /* not ND_IP6_H_ */