1 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)ip.h 8.1 (Berkeley) 6/10/93 63 */ 64 65 #ifndef _NETINET_IP6_H_ 66 #define _NETINET_IP6_H_ 67 68 /* 69 * Definition for internet protocol version 6. 70 * RFC 2460 71 */ 72 73 struct ip6_hdr { 74 union { 75 struct ip6_hdrctl { 76 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */ 77 u_int16_t ip6_un1_plen; /* payload length */ 78 u_int8_t ip6_un1_nxt; /* next header */ 79 u_int8_t ip6_un1_hlim; /* hop limit */ 80 } ip6_un1; 81 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */ 82 } ip6_ctlun; 83 struct in6_addr ip6_src; /* source address */ 84 struct in6_addr ip6_dst; /* destination address */ 85 } __packed; 86 87 #define ip6_vfc ip6_ctlun.ip6_un2_vfc 88 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow 89 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen 90 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt 91 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim 92 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim 93 94 #define IPV6_VERSION 0x60 95 #define IPV6_VERSION_MASK 0xf0 96 97 #if BYTE_ORDER == BIG_ENDIAN 98 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */ 99 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */ 100 #define IPV6_ECN_MASK 0x00300000 /* ECN code point (2 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 #define IPV6_ECN_MASK 0x00003000 /* ECN code point (2 bits) */ 106 #endif /* LITTLE_ENDIAN */ 107 #endif 108 #define IPV6_FLOWLABEL_LEN 20 109 110 #define IPV6_TRAFFIC_CLASS(ip6) ((ntohl((ip6)->ip6_flow) >> IPV6_FLOWLABEL_LEN) & 0xff) 111 #define IPV6_DSCP(ip6) ((ntohl((ip6)->ip6_flow) >> IPV6_FLOWLABEL_LEN) & 0xfc) 112 #define IPV6_ECN(ip6) ((ntohl((ip6)->ip6_flow) >> IPV6_FLOWLABEL_LEN) & 0x03) 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_DEFFRAGTTL 60000 /* Default fragment packets lifetime, in milliseconds */ 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 #endif /* not _NETINET_IP6_H_ */ 266