sys/netinet/ip6.h

   1 /*      $FreeBSD$       */
   2 /*      $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 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  * 4. 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 /*
 112  * Extension Headers
 113  */
 114
 115 struct  ip6_ext {
 116         u_int8_t ip6e_nxt;
 117         u_int8_t ip6e_len;
 118 } __packed;
 119
 120 /* Hop-by-Hop options header */
 121 /* XXX should we pad it to force alignment on an 8-byte boundary? */
 122 struct ip6_hbh {
 123         u_int8_t ip6h_nxt;      /* next header */
 124         u_int8_t ip6h_len;      /* length in units of 8 octets */
 125         /* followed by options */
 126 } __packed;
 127
 128 /* Destination options header */
 129 /* XXX should we pad it to force alignment on an 8-byte boundary? */
 130 struct ip6_dest {
 131         u_int8_t ip6d_nxt;      /* next header */
 132         u_int8_t ip6d_len;      /* length in units of 8 octets */
 133         /* followed by options */
 134 } __packed;
 135
 136 /* Option types and related macros */
 137 #define IP6OPT_PAD1             0x00    /* 00 0 00000 */
 138 #define IP6OPT_PADN             0x01    /* 00 0 00001 */
 139 #define IP6OPT_JUMBO            0xC2    /* 11 0 00010 = 194 */
 140 #define IP6OPT_NSAP_ADDR        0xC3    /* 11 0 00011 */
 141 #define IP6OPT_TUNNEL_LIMIT     0x04    /* 00 0 00100 */
 142 #ifndef _KERNEL
 143 #define IP6OPT_RTALERT          0x05    /* 00 0 00101 (KAME definition) */
 144 #endif
 145 #define IP6OPT_ROUTER_ALERT     0x05    /* 00 0 00101 (RFC3542, recommended) */
 146
 147 #define IP6OPT_RTALERT_LEN      4
 148 #define IP6OPT_RTALERT_MLD      0       /* Datagram contains an MLD message */
 149 #define IP6OPT_RTALERT_RSVP     1       /* Datagram contains an RSVP message */
 150 #define IP6OPT_RTALERT_ACTNET   2       /* contains an Active Networks msg */
 151 #define IP6OPT_MINLEN           2
 152
 153 #define IP6OPT_EID              0x8a    /* 10 0 01010 */
 154
 155 #define IP6OPT_TYPE(o)          ((o) & 0xC0)
 156 #define IP6OPT_TYPE_SKIP        0x00
 157 #define IP6OPT_TYPE_DISCARD     0x40
 158 #define IP6OPT_TYPE_FORCEICMP   0x80
 159 #define IP6OPT_TYPE_ICMP        0xC0
 160
 161 #define IP6OPT_MUTABLE          0x20
 162
 163 /* IPv6 options: common part */
 164 struct ip6_opt {
 165         u_int8_t ip6o_type;
 166         u_int8_t ip6o_len;
 167 } __packed;
 168
 169 /* Jumbo Payload Option */
 170 struct ip6_opt_jumbo {
 171         u_int8_t ip6oj_type;
 172         u_int8_t ip6oj_len;
 173         u_int8_t ip6oj_jumbo_len[4];
 174 } __packed;
 175 #define IP6OPT_JUMBO_LEN        6
 176
 177 /* NSAP Address Option */
 178 struct ip6_opt_nsap {
 179         u_int8_t ip6on_type;
 180         u_int8_t ip6on_len;
 181         u_int8_t ip6on_src_nsap_len;
 182         u_int8_t ip6on_dst_nsap_len;
 183         /* followed by source NSAP */
 184         /* followed by destination NSAP */
 185 } __packed;
 186
 187 /* Tunnel Limit Option */
 188 struct ip6_opt_tunnel {
 189         u_int8_t ip6ot_type;
 190         u_int8_t ip6ot_len;
 191         u_int8_t ip6ot_encap_limit;
 192 } __packed;
 193
 194 /* Router Alert Option */
 195 struct ip6_opt_router {
 196         u_int8_t ip6or_type;
 197         u_int8_t ip6or_len;
 198         u_int8_t ip6or_value[2];
 199 } __packed;
 200 /* Router alert values (in network byte order) */
 201 #if BYTE_ORDER == BIG_ENDIAN
 202 #define IP6_ALERT_MLD   0x0000
 203 #define IP6_ALERT_RSVP  0x0001
 204 #define IP6_ALERT_AN    0x0002
 205 #else
 206 #if BYTE_ORDER == LITTLE_ENDIAN
 207 #define IP6_ALERT_MLD   0x0000
 208 #define IP6_ALERT_RSVP  0x0100
 209 #define IP6_ALERT_AN    0x0200
 210 #endif /* LITTLE_ENDIAN */
 211 #endif
 212
 213 /* Routing header */
 214 struct ip6_rthdr {
 215         u_int8_t  ip6r_nxt;     /* next header */
 216         u_int8_t  ip6r_len;     /* length in units of 8 octets */
 217         u_int8_t  ip6r_type;    /* routing type */
 218         u_int8_t  ip6r_segleft; /* segments left */
 219         /* followed by routing type specific data */
 220 } __packed;
 221
 222 /* Type 0 Routing header */
 223 struct ip6_rthdr0 {
 224         u_int8_t  ip6r0_nxt;            /* next header */
 225         u_int8_t  ip6r0_len;            /* length in units of 8 octets */
 226         u_int8_t  ip6r0_type;           /* always zero */
 227         u_int8_t  ip6r0_segleft;        /* segments left */
 228         u_int32_t  ip6r0_reserved;      /* reserved field */
 229         /* followed by up to 127 struct in6_addr */
 230 } __packed;
 231
 232 /* Fragment header */
 233 struct ip6_frag {
 234         u_int8_t  ip6f_nxt;             /* next header */
 235         u_int8_t  ip6f_reserved;        /* reserved field */
 236         u_int16_t ip6f_offlg;           /* offset, reserved, and flag */
 237         u_int32_t ip6f_ident;           /* identification */
 238 } __packed;
 239
 240 #if BYTE_ORDER == BIG_ENDIAN
 241 #define IP6F_OFF_MASK           0xfff8  /* mask out offset from _offlg */
 242 #define IP6F_RESERVED_MASK      0x0006  /* reserved bits in ip6f_offlg */
 243 #define IP6F_MORE_FRAG          0x0001  /* more-fragments flag */
 244 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 245 #define IP6F_OFF_MASK           0xf8ff  /* mask out offset from _offlg */
 246 #define IP6F_RESERVED_MASK      0x0600  /* reserved bits in ip6f_offlg */
 247 #define IP6F_MORE_FRAG          0x0100  /* more-fragments flag */
 248 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 249
 250 /*
 251  * Internet implementation parameters.
 252  */
 253 #define IPV6_MAXHLIM    255     /* maximum hoplimit */
 254 #define IPV6_DEFHLIM    64      /* default hlim */
 255 #define IPV6_FRAGTTL    120     /* ttl for fragment packets, in slowtimo tick */
 256 #define IPV6_HLIMDEC    1       /* subtracted when forwarding */
 257
 258 #define IPV6_MMTU       1280    /* minimal MTU and reassembly. 1024 + 256 */
 259 #define IPV6_MAXPACKET  65535   /* ip6 max packet size without Jumbo payload*/
 260 #define IPV6_MAXOPTHDR  2048    /* max option header size, 256 64-bit words */
 261
 262 #ifdef _KERNEL
 263 /*
 264  * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
 265  * target header (including IPv6 itself, extension headers and
 266  * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
 267  * to store incoming data into one internal mbuf or one or more external
 268  * mbufs(never into two or more internal mbufs). Thus, the third case is
 269  * supposed to never be matched but is prepared just in case.
 270  */
 271
 272 #define IP6_EXTHDR_CHECK(m, off, hlen, ret)                             \
 273 do {                                                                    \
 274     if ((m)->m_next != NULL) {                                          \
 275         if (((m)->m_flags & M_LOOP) &&                                  \
 276             ((m)->m_len < (off) + (hlen)) &&                            \
 277             (((m) = m_pullup((m), (off) + (hlen))) == NULL)) {          \
 278                 V_ip6stat.ip6s_exthdrtoolong++;                         \
 279                 return ret;                                             \
 280         } else if ((m)->m_flags & M_EXT) {                              \
 281                 if ((m)->m_len < (off) + (hlen)) {                      \
 282                         V_ip6stat.ip6s_exthdrtoolong++;                 \
 283                         m_freem(m);                                     \
 284                         return ret;                                     \
 285                 }                                                       \
 286         } else {                                                        \
 287                 if ((m)->m_len < (off) + (hlen)) {                      \
 288                         V_ip6stat.ip6s_exthdrtoolong++;                 \
 289                         m_freem(m);                                     \
 290                         return ret;                                     \
 291                 }                                                       \
 292         }                                                               \
 293     } else {                                                            \
 294         if ((m)->m_len < (off) + (hlen)) {                              \
 295                 V_ip6stat.ip6s_tooshort++;                              \
 296                 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);   \
 297                 m_freem(m);                                             \
 298                 return ret;                                             \
 299         }                                                               \
 300     }                                                                   \
 301 } while (/*CONSTCOND*/ 0)
 302
 303 /*
 304  * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
 305  * "len") is located in single mbuf, on contiguous memory region.
 306  * The pointer to the region will be returned to pointer variable "val",
 307  * with type "typ".
 308  * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
 309  * very top of mbuf.  GET0 is likely to make memory copy than GET.
 310  *
 311  * XXX we're now testing this, needs m_pulldown()
 312  */
 313 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
 314 do {                                                                    \
 315         struct mbuf *t;                                                 \
 316         int tmp;                                                        \
 317         if ((m)->m_len >= (off) + (len))                                \
 318                 (val) = (typ)(mtod((m), caddr_t) + (off));              \
 319         else {                                                          \
 320                 t = m_pulldown((m), (off), (len), &tmp);                \
 321                 if (t) {                                                \
 322                         if (t->m_len < tmp + (len))                     \
 323                                 panic("m_pulldown malfunction");        \
 324                         (val) = (typ)(mtod(t, caddr_t) + tmp);          \
 325                 } else {                                                \
 326                         (val) = (typ)NULL;                              \
 327                         (m) = NULL;                                     \
 328                 }                                                       \
 329         }                                                               \
 330 } while (/*CONSTCOND*/ 0)
 331
 332 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
 333 do {                                                                    \
 334         struct mbuf *t;                                                 \
 335         if ((off) == 0)                                                 \
 336                 (val) = (typ)mtod(m, caddr_t);                          \
 337         else {                                                          \
 338                 t = m_pulldown((m), (off), (len), NULL);                \
 339                 if (t) {                                                \
 340                         if (t->m_len < (len))                           \
 341                                 panic("m_pulldown malfunction");        \
 342                         (val) = (typ)mtod(t, caddr_t);                  \
 343                 } else {                                                \
 344                         (val) = (typ)NULL;                              \
 345                         (m) = NULL;                                     \
 346                 }                                                       \
 347         }                                                               \
 348 } while (/*CONSTCOND*/ 0)
 349 #endif /*_KERNEL*/
 350
 351 #endif /* not _NETINET_IP6_H_ */