sys/netinet/ip6.h

   1 /*      $NetBSD: ip6.h,v 1.22 2007/03/04 06:03:20 christos Exp $        */
   2 /*      $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi 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. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
  62  */
  63
  64 #ifndef _NETINET_IP6_H_
  65 #define _NETINET_IP6_H_
  66
  67 /*
  68  * Definition for internet protocol version 6.
  69  * RFC 2460
  70  */
  71
  72 struct ip6_hdr {
  73         union {
  74                 struct ip6_hdrctl {
  75                         u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
  76                         u_int16_t ip6_un1_plen; /* payload length */
  77                         u_int8_t  ip6_un1_nxt;  /* next header */
  78                         u_int8_t  ip6_un1_hlim; /* hop limit */
  79                 } ip6_un1;
  80                 u_int8_t ip6_un2_vfc;   /* 4 bits version, top 4 bits class */
  81         } ip6_ctlun;
  82         struct in6_addr ip6_src;        /* source address */
  83         struct in6_addr ip6_dst;        /* destination address */
  84 } __packed;
  85
  86 #define ip6_vfc         ip6_ctlun.ip6_un2_vfc
  87 #define ip6_flow        ip6_ctlun.ip6_un1.ip6_un1_flow
  88 #define ip6_plen        ip6_ctlun.ip6_un1.ip6_un1_plen
  89 #define ip6_nxt         ip6_ctlun.ip6_un1.ip6_un1_nxt
  90 #define ip6_hlim        ip6_ctlun.ip6_un1.ip6_un1_hlim
  91 #define ip6_hops        ip6_ctlun.ip6_un1.ip6_un1_hlim
  92
  93 #define IPV6_VERSION            0x60
  94 #define IPV6_VERSION_MASK       0xf0
  95
  96 #if BYTE_ORDER == BIG_ENDIAN
  97 #define IPV6_FLOWINFO_MASK      0x0fffffff      /* flow info (28 bits) */
  98 #define IPV6_FLOWLABEL_MASK     0x000fffff      /* flow label (20 bits) */
  99 #else
 100 #if BYTE_ORDER == LITTLE_ENDIAN
 101 #define IPV6_FLOWINFO_MASK      0xffffff0f      /* flow info (28 bits) */
 102 #define IPV6_FLOWLABEL_MASK     0xffff0f00      /* flow label (20 bits) */
 103 #endif /* LITTLE_ENDIAN */
 104 #endif
 105 #if 1
 106 /* ECN bits proposed by Sally Floyd */
 107 #define IP6TOS_CE               0x01    /* congestion experienced */
 108 #define IP6TOS_ECT              0x02    /* ECN-capable transport */
 109 #endif
 110
 111 #ifdef _KERNEL
 112 /*
 113  * for IPv6 pseudo header checksum
 114  * XXX nonstandard
 115  */
 116 struct ip6_hdr_pseudo {
 117         struct in6_addr ip6ph_src;
 118         struct in6_addr ip6ph_dst;
 119         u_int32_t       ip6ph_len;
 120         u_int8_t        ip6ph_zero[3];
 121         u_int8_t        ip6ph_nxt;
 122 } __packed;
 123 #endif
 124
 125 /*
 126  * Extension Headers
 127  */
 128
 129 struct  ip6_ext {
 130         u_int8_t ip6e_nxt;
 131         u_int8_t ip6e_len;
 132 } __packed;
 133
 134 /* Hop-by-Hop options header */
 135 /* XXX should we pad it to force alignment on an 8-byte boundary? */
 136 struct ip6_hbh {
 137         u_int8_t ip6h_nxt;      /* next header */
 138         u_int8_t ip6h_len;      /* length in units of 8 octets */
 139         /* followed by options */
 140 } __packed;
 141
 142 /* Destination options header */
 143 /* XXX should we pad it to force alignment on an 8-byte boundary? */
 144 struct ip6_dest {
 145         u_int8_t ip6d_nxt;      /* next header */
 146         u_int8_t ip6d_len;      /* length in units of 8 octets */
 147         /* followed by options */
 148 } __packed;
 149
 150 /* Option types and related macros */
 151 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
 152 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
 153 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
 154 #define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
 155 #define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
 156 #define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
 157 #define IP6OPT_ROUTER_ALERT     0x05    /* (RFC3542 def, recommended) */
 158
 159 #define IP6OPT_RTALERT_LEN      4
 160 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
 161 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
 162 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
 163 #define IP6OPT_MINLEN           2
 164
 165 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
 166 #define IP6OPT_TYPE_SKIP        0x00
 167 #define IP6OPT_TYPE_DISCARD     0x40
 168 #define IP6OPT_TYPE_FORCEICMP   0x80
 169 #define IP6OPT_TYPE_ICMP        0xC0
 170
 171 #define IP6OPT_MUTABLE          0x20
 172
 173 /* IPv6 options: common part */
 174 struct ip6_opt {
 175         u_int8_t ip6o_type;
 176         u_int8_t ip6o_len;
 177 } __packed;
 178
 179 /* Jumbo Payload Option */
 180 struct ip6_opt_jumbo {
 181         u_int8_t ip6oj_type;
 182         u_int8_t ip6oj_len;
 183         u_int8_t ip6oj_jumbo_len[4];
 184 } __packed;
 185 #define IP6OPT_JUMBO_LEN 6
 186
 187 /* NSAP Address Option */
 188 struct ip6_opt_nsap {
 189         u_int8_t ip6on_type;
 190         u_int8_t ip6on_len;
 191         u_int8_t ip6on_src_nsap_len;
 192         u_int8_t ip6on_dst_nsap_len;
 193         /* followed by source NSAP */
 194         /* followed by destination NSAP */
 195 } __packed;
 196
 197 /* Tunnel Limit Option */
 198 struct ip6_opt_tunnel {
 199         u_int8_t ip6ot_type;
 200         u_int8_t ip6ot_len;
 201         u_int8_t ip6ot_encap_limit;
 202 } __packed;
 203
 204 /* Router Alert Option */
 205 struct ip6_opt_router {
 206         u_int8_t ip6or_type;
 207         u_int8_t ip6or_len;
 208         u_int8_t ip6or_value[2];
 209 } __packed;
 210 /* Router alert values (in network byte order) */
 211 #if BYTE_ORDER == BIG_ENDIAN
 212 #define IP6_ALERT_MLD   0x0000
 213 #define IP6_ALERT_RSVP  0x0001
 214 #define IP6_ALERT_AN    0x0002
 215 #else
 216 #if BYTE_ORDER == LITTLE_ENDIAN
 217 #define IP6_ALERT_MLD   0x0000
 218 #define IP6_ALERT_RSVP  0x0100
 219 #define IP6_ALERT_AN    0x0200
 220 #endif /* LITTLE_ENDIAN */
 221 #endif
 222
 223 /* Routing header */
 224 struct ip6_rthdr {
 225         u_int8_t  ip6r_nxt;     /* next header */
 226         u_int8_t  ip6r_len;     /* length in units of 8 octets */
 227         u_int8_t  ip6r_type;    /* routing type */
 228         u_int8_t  ip6r_segleft; /* segments left */
 229         /* followed by routing type specific data */
 230 } __packed;
 231
 232 /* Type 0 Routing header */
 233 struct ip6_rthdr0 {
 234         u_int8_t  ip6r0_nxt;            /* next header */
 235         u_int8_t  ip6r0_len;            /* length in units of 8 octets */
 236         u_int8_t  ip6r0_type;           /* always zero */
 237         u_int8_t  ip6r0_segleft;        /* segments left */
 238         u_int32_t ip6r0_reserved;       /* reserved field */
 239 } __packed;
 240
 241 /* Fragment header */
 242 struct ip6_frag {
 243         u_int8_t  ip6f_nxt;             /* next header */
 244         u_int8_t  ip6f_reserved;        /* reserved field */
 245         u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
 246         u_int32_t ip6f_ident;           /* identification */
 247 } __packed;
 248
 249 #if BYTE_ORDER == BIG_ENDIAN
 250 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from _offlg */
 251 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
 252 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
 253 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 254 #define IP6F_OFF_MASK           0xf8ff  /* mask out offset from _offlg */
 255 #define IP6F_RESERVED_MASK      0x0600  /* reserved bits in ip6f_offlg */
 256 #define IP6F_MORE_FRAG          0x0100  /* more-fragments flag */
 257 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 258
 259 /*
 260  * Internet implementation parameters.
 261  */
 262 #define IPV6_MAXHLIM    255     /* maximum hoplimit */
 263 #define IPV6_DEFHLIM    64      /* default hlim */
 264 #define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
 265 #define IPV6_HLIMDEC    1       /* subtracted when forwarding */
 266
 267 #define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
 268 #define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/
 269
 270 #ifdef _KERNEL
 271 /*
 272  * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
 273  * "len") is located in single mbuf, on contiguous memory region.
 274  * The pointer to the region will be returned to pointer variable "val",
 275  * with type "typ".
 276  * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
 277  * very top of mbuf.  GET0 is likely to make memory copy than GET.
 278  *
 279  * XXX we're now testing this, needs m_pulldown()
 280  */
 281 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
 282 do {                                                                    \
 283         struct mbuf *_t;                                                \
 284         int _tmp;                                                       \
 285         if ((m)->m_len >= (off) + (len))                                \
 286                 (val) = (typ)(mtod((m), char *) + (off));               \
 287         else {                                                          \
 288                 _t = m_pulldown((m), (off), (len), &_tmp);              \
 289                 if (_t) {                                               \
 290                         if (_t->m_len < _tmp + (len))                   \
 291                                 panic("m_pulldown malfunction");        \
 292                         (val) = (typ)(mtod(_t, char *) + _tmp); \
 293                 } else {                                                \
 294                         (val) = (typ)NULL;                              \
 295                         (m) = NULL;                                     \
 296                 }                                                       \
 297         }                                                               \
 298 } while (/*CONSTCOND*/ 0)
 299
 300 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
 301 do {                                                                    \
 302         struct mbuf *_t;                                                \
 303         if ((off) == 0 && (m)->m_len >= len)                            \
 304                 (val) = (typ)mtod((m), void *);                 \
 305         else {                                                          \
 306                 _t = m_pulldown((m), (off), (len), NULL);               \
 307                 if (_t) {                                               \
 308                         if (_t->m_len < (len))                          \
 309                                 panic("m_pulldown malfunction");        \
 310                         (val) = (typ)mtod(_t, void *);                  \
 311                 } else {                                                \
 312                         (val) = (typ)NULL;                              \
 313                         (m) = NULL;                                     \
 314                 }                                                       \
 315         }                                                               \
 316 } while (/*CONSTCOND*/ 0)
 317 #endif /*_KERNEL*/
 318
 319 #endif /* !_NETINET_IP6_H_ */