ip6.h revision 11cd02dfb91661c65134cac258cf5924270e9d2b
1/* $NetBSD: ip6.h,v 1.23 2007/12/25 18:33:46 perry 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 72struct 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 */ 116struct 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 129struct 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? */ 136struct 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? */ 144struct 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 */ 174struct ip6_opt { 175 u_int8_t ip6o_type; 176 u_int8_t ip6o_len; 177} __packed; 178 179/* Jumbo Payload Option */ 180struct 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 */ 188struct 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 */ 198struct 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 */ 205struct 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 */ 224struct 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 */ 233struct 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 */ 242struct 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) \ 282do { \ 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) \ 301do { \ 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_ */ 320