1 /* $FreeBSD$ */ 2 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-3-Clause 6 * 7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /*- 36 * Copyright (c) 1982, 1986, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * @(#)ip.h 8.1 (Berkeley) 6/10/93 64 */ 65 66 #ifndef _NETINET_IP6_H_ 67 #define _NETINET_IP6_H_ 68 69 /* 70 * Definition for internet protocol version 6. 71 * RFC 2460 72 */ 73 74 struct ip6_hdr { 75 union { 76 struct ip6_hdrctl { 77 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */ 78 u_int16_t ip6_un1_plen; /* payload length */ 79 u_int8_t ip6_un1_nxt; /* next header */ 80 u_int8_t ip6_un1_hlim; /* hop limit */ 81 } ip6_un1; 82 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */ 83 } ip6_ctlun; 84 struct in6_addr ip6_src; /* source address */ 85 struct in6_addr ip6_dst; /* destination address */ 86 } __packed; 87 88 #define ip6_vfc ip6_ctlun.ip6_un2_vfc 89 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow 90 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen 91 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt 92 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim 93 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim 94 95 #define IPV6_VERSION 0x60 96 #define IPV6_VERSION_MASK 0xf0 97 98 #if BYTE_ORDER == BIG_ENDIAN 99 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */ 100 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */ 101 #else 102 #if BYTE_ORDER == LITTLE_ENDIAN 103 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */ 104 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */ 105 #endif /* LITTLE_ENDIAN */ 106 #endif 107 #define IPV6_FLOWLABEL_LEN 20 108 #if 1 109 /* ECN bits proposed by Sally Floyd */ 110 #define IP6TOS_CE 0x01 /* congestion experienced */ 111 #define IP6TOS_ECT 0x02 /* ECN-capable transport */ 112 #endif 113 114 /* 115 * Extension Headers 116 */ 117 118 struct ip6_ext { 119 u_int8_t ip6e_nxt; 120 u_int8_t ip6e_len; 121 } __packed; 122 123 /* Hop-by-Hop options header */ 124 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 125 struct ip6_hbh { 126 u_int8_t ip6h_nxt; /* next header */ 127 u_int8_t ip6h_len; /* length in units of 8 octets */ 128 /* followed by options */ 129 } __packed; 130 131 /* Destination options header */ 132 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 133 struct ip6_dest { 134 u_int8_t ip6d_nxt; /* next header */ 135 u_int8_t ip6d_len; /* length in units of 8 octets */ 136 /* followed by options */ 137 } __packed; 138 139 /* Option types and related macros */ 140 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */ 141 #define IP6OPT_PADN 0x01 /* 00 0 00001 */ 142 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ 143 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */ 144 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */ 145 #ifndef _KERNEL 146 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */ 147 #endif 148 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */ 149 150 #define IP6OPT_RTALERT_LEN 4 151 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ 152 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ 153 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ 154 #define IP6OPT_MINLEN 2 155 156 #define IP6OPT_EID 0x8a /* 10 0 01010 */ 157 158 #define IP6OPT_TYPE(o) ((o) & 0xC0) 159 #define IP6OPT_TYPE_SKIP 0x00 160 #define IP6OPT_TYPE_DISCARD 0x40 161 #define IP6OPT_TYPE_FORCEICMP 0x80 162 #define IP6OPT_TYPE_ICMP 0xC0 163 164 #define IP6OPT_MUTABLE 0x20 165 166 /* IPv6 options: common part */ 167 struct ip6_opt { 168 u_int8_t ip6o_type; 169 u_int8_t ip6o_len; 170 } __packed; 171 172 /* Jumbo Payload Option */ 173 struct ip6_opt_jumbo { 174 u_int8_t ip6oj_type; 175 u_int8_t ip6oj_len; 176 u_int8_t ip6oj_jumbo_len[4]; 177 } __packed; 178 #define IP6OPT_JUMBO_LEN 6 179 180 /* NSAP Address Option */ 181 struct ip6_opt_nsap { 182 u_int8_t ip6on_type; 183 u_int8_t ip6on_len; 184 u_int8_t ip6on_src_nsap_len; 185 u_int8_t ip6on_dst_nsap_len; 186 /* followed by source NSAP */ 187 /* followed by destination NSAP */ 188 } __packed; 189 190 /* Tunnel Limit Option */ 191 struct ip6_opt_tunnel { 192 u_int8_t ip6ot_type; 193 u_int8_t ip6ot_len; 194 u_int8_t ip6ot_encap_limit; 195 } __packed; 196 197 /* Router Alert Option */ 198 struct ip6_opt_router { 199 u_int8_t ip6or_type; 200 u_int8_t ip6or_len; 201 u_int8_t ip6or_value[2]; 202 } __packed; 203 /* Router alert values (in network byte order) */ 204 #if BYTE_ORDER == BIG_ENDIAN 205 #define IP6_ALERT_MLD 0x0000 206 #define IP6_ALERT_RSVP 0x0001 207 #define IP6_ALERT_AN 0x0002 208 #else 209 #if BYTE_ORDER == LITTLE_ENDIAN 210 #define IP6_ALERT_MLD 0x0000 211 #define IP6_ALERT_RSVP 0x0100 212 #define IP6_ALERT_AN 0x0200 213 #endif /* LITTLE_ENDIAN */ 214 #endif 215 216 /* Routing header */ 217 struct ip6_rthdr { 218 u_int8_t ip6r_nxt; /* next header */ 219 u_int8_t ip6r_len; /* length in units of 8 octets */ 220 u_int8_t ip6r_type; /* routing type */ 221 u_int8_t ip6r_segleft; /* segments left */ 222 /* followed by routing type specific data */ 223 } __packed; 224 225 /* Type 0 Routing header, deprecated by RFC 5095. */ 226 struct ip6_rthdr0 { 227 u_int8_t ip6r0_nxt; /* next header */ 228 u_int8_t ip6r0_len; /* length in units of 8 octets */ 229 u_int8_t ip6r0_type; /* always zero */ 230 u_int8_t ip6r0_segleft; /* segments left */ 231 u_int32_t ip6r0_reserved; /* reserved field */ 232 /* followed by up to 127 struct in6_addr */ 233 } __packed; 234 235 /* Fragment header */ 236 struct ip6_frag { 237 u_int8_t ip6f_nxt; /* next header */ 238 u_int8_t ip6f_reserved; /* reserved field */ 239 u_int16_t ip6f_offlg; /* offset, reserved, and flag */ 240 u_int32_t ip6f_ident; /* identification */ 241 } __packed; 242 243 #if BYTE_ORDER == BIG_ENDIAN 244 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */ 245 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */ 246 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */ 247 #else /* BYTE_ORDER == LITTLE_ENDIAN */ 248 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */ 249 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */ 250 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */ 251 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 252 253 /* 254 * Internet implementation parameters. 255 */ 256 #define IPV6_MAXHLIM 255 /* maximum hoplimit */ 257 #define IPV6_DEFHLIM 64 /* default hlim */ 258 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */ 259 #define IPV6_HLIMDEC 1 /* subtracted when forwarding */ 260 261 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */ 262 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/ 263 #define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */ 264 265 #ifdef _KERNEL 266 /* 267 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the 268 * target header (including IPv6 itself, extension headers and 269 * TCP/UDP/ICMP6 headers) are contiguous. KAME requires drivers 270 * to store incoming data into one internal mbuf or one or more external 271 * mbufs(never into two or more internal mbufs). Thus, the third case is 272 * supposed to never be matched but is prepared just in case. 273 */ 274 275 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \ 276 do { \ 277 if ((m)->m_next != NULL) { \ 278 if (((m)->m_flags & M_LOOP) && \ 279 ((m)->m_len < (off) + (hlen)) && \ 280 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \ 281 IP6STAT_INC(ip6s_exthdrtoolong); \ 282 return ret; \ 283 } else { \ 284 if ((m)->m_len < (off) + (hlen)) { \ 285 IP6STAT_INC(ip6s_exthdrtoolong); \ 286 m_freem(m); \ 287 return ret; \ 288 } \ 289 } \ 290 } else { \ 291 if ((m)->m_len < (off) + (hlen)) { \ 292 IP6STAT_INC(ip6s_tooshort); \ 293 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \ 294 m_freem(m); \ 295 return ret; \ 296 } \ 297 } \ 298 } while (/*CONSTCOND*/ 0) 299 300 /* 301 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to 302 * "len") is located in single mbuf, on contiguous memory region. 303 * The pointer to the region will be returned to pointer variable "val", 304 * with type "typ". 305 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the 306 * very top of mbuf. GET0 is likely to make memory copy than GET. 307 * 308 * XXX we're now testing this, needs m_pulldown() 309 */ 310 #define IP6_EXTHDR_GET(val, typ, m, off, len) \ 311 do { \ 312 struct mbuf *t; \ 313 int tmp; \ 314 if ((m)->m_len >= (off) + (len)) \ 315 (val) = (typ)(mtod((m), caddr_t) + (off)); \ 316 else { \ 317 t = m_pulldown((m), (off), (len), &tmp); \ 318 if (t) { \ 319 if (t->m_len < tmp + (len)) \ 320 panic("m_pulldown malfunction"); \ 321 (val) = (typ)(mtod(t, caddr_t) + tmp); \ 322 } else { \ 323 (val) = (typ)NULL; \ 324 (m) = NULL; \ 325 } \ 326 } \ 327 } while (/*CONSTCOND*/ 0) 328 329 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \ 330 do { \ 331 struct mbuf *t; \ 332 if ((off) == 0) \ 333 (val) = (typ)mtod(m, caddr_t); \ 334 else { \ 335 t = m_pulldown((m), (off), (len), NULL); \ 336 if (t) { \ 337 if (t->m_len < (len)) \ 338 panic("m_pulldown malfunction"); \ 339 (val) = (typ)mtod(t, caddr_t); \ 340 } else { \ 341 (val) = (typ)NULL; \ 342 (m) = NULL; \ 343 } \ 344 } \ 345 } while (/*CONSTCOND*/ 0) 346 347 #endif /*_KERNEL*/ 348 349 #endif /* not _NETINET_IP6_H_ */ 350