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 63 #ifndef _NETINET_IP6_H_ 64 #define _NETINET_IP6_H_ 65 66 /* 67 * Definition for internet protocol version 6. 68 * RFC 2460 69 */ 70 71 struct ip6_hdr { 72 union { 73 struct ip6_hdrctl { 74 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */ 75 u_int16_t ip6_un1_plen; /* payload length */ 76 u_int8_t ip6_un1_nxt; /* next header */ 77 u_int8_t ip6_un1_hlim; /* hop limit */ 78 } ip6_un1; 79 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */ 80 } ip6_ctlun; 81 struct in6_addr ip6_src; /* source address */ 82 struct in6_addr ip6_dst; /* destination address */ 83 } __packed; 84 85 #define ip6_vfc ip6_ctlun.ip6_un2_vfc 86 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow 87 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen 88 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt 89 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim 90 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim 91 92 #define IPV6_VERSION 0x60 93 #define IPV6_VERSION_MASK 0xf0 94 95 #if BYTE_ORDER == BIG_ENDIAN 96 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */ 97 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */ 98 #define IPV6_ECN_MASK 0x00300000 /* ECN code point (2 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 #define IPV6_ECN_MASK 0x00003000 /* ECN code point (2 bits) */ 104 #endif /* LITTLE_ENDIAN */ 105 #endif 106 #define IPV6_FLOWLABEL_LEN 20 107 108 #define IPV6_TRAFFIC_CLASS(ip6) ((ntohl((ip6)->ip6_flow) >> IPV6_FLOWLABEL_LEN) & 0xff) 109 #define IPV6_DSCP(ip6) ((ntohl((ip6)->ip6_flow) >> IPV6_FLOWLABEL_LEN) & 0xfc) 110 #define IPV6_ECN(ip6) ((ntohl((ip6)->ip6_flow) >> IPV6_FLOWLABEL_LEN) & 0x03) 111 112 /* 113 * Extension Headers 114 */ 115 116 struct ip6_ext { 117 u_int8_t ip6e_nxt; 118 u_int8_t ip6e_len; 119 } __packed; 120 121 /* Hop-by-Hop options header */ 122 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 123 struct ip6_hbh { 124 u_int8_t ip6h_nxt; /* next header */ 125 u_int8_t ip6h_len; /* length in units of 8 octets */ 126 /* followed by options */ 127 } __packed; 128 129 /* Destination options header */ 130 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 131 struct ip6_dest { 132 u_int8_t ip6d_nxt; /* next header */ 133 u_int8_t ip6d_len; /* length in units of 8 octets */ 134 /* followed by options */ 135 } __packed; 136 137 /* Option types and related macros */ 138 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */ 139 #define IP6OPT_PADN 0x01 /* 00 0 00001 */ 140 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ 141 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */ 142 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */ 143 #ifndef _KERNEL 144 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */ 145 #endif 146 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */ 147 148 #define IP6OPT_RTALERT_LEN 4 149 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ 150 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ 151 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ 152 #define IP6OPT_MINLEN 2 153 154 #define IP6OPT_EID 0x8a /* 10 0 01010 */ 155 156 #define IP6OPT_TYPE(o) ((o) & 0xC0) 157 #define IP6OPT_TYPE_SKIP 0x00 158 #define IP6OPT_TYPE_DISCARD 0x40 159 #define IP6OPT_TYPE_FORCEICMP 0x80 160 #define IP6OPT_TYPE_ICMP 0xC0 161 162 #define IP6OPT_MUTABLE 0x20 163 164 /* IPv6 options: common part */ 165 struct ip6_opt { 166 u_int8_t ip6o_type; 167 u_int8_t ip6o_len; 168 } __packed; 169 170 /* Jumbo Payload Option */ 171 struct ip6_opt_jumbo { 172 u_int8_t ip6oj_type; 173 u_int8_t ip6oj_len; 174 u_int8_t ip6oj_jumbo_len[4]; 175 } __packed; 176 #define IP6OPT_JUMBO_LEN 6 177 178 /* NSAP Address Option */ 179 struct ip6_opt_nsap { 180 u_int8_t ip6on_type; 181 u_int8_t ip6on_len; 182 u_int8_t ip6on_src_nsap_len; 183 u_int8_t ip6on_dst_nsap_len; 184 /* followed by source NSAP */ 185 /* followed by destination NSAP */ 186 } __packed; 187 188 /* Tunnel Limit Option */ 189 struct ip6_opt_tunnel { 190 u_int8_t ip6ot_type; 191 u_int8_t ip6ot_len; 192 u_int8_t ip6ot_encap_limit; 193 } __packed; 194 195 /* Router Alert Option */ 196 struct ip6_opt_router { 197 u_int8_t ip6or_type; 198 u_int8_t ip6or_len; 199 u_int8_t ip6or_value[2]; 200 } __packed; 201 /* Router alert values (in network byte order) */ 202 #if BYTE_ORDER == BIG_ENDIAN 203 #define IP6_ALERT_MLD 0x0000 204 #define IP6_ALERT_RSVP 0x0001 205 #define IP6_ALERT_AN 0x0002 206 #else 207 #if BYTE_ORDER == LITTLE_ENDIAN 208 #define IP6_ALERT_MLD 0x0000 209 #define IP6_ALERT_RSVP 0x0100 210 #define IP6_ALERT_AN 0x0200 211 #endif /* LITTLE_ENDIAN */ 212 #endif 213 214 /* Routing header */ 215 struct ip6_rthdr { 216 u_int8_t ip6r_nxt; /* next header */ 217 u_int8_t ip6r_len; /* length in units of 8 octets */ 218 u_int8_t ip6r_type; /* routing type */ 219 u_int8_t ip6r_segleft; /* segments left */ 220 /* followed by routing type specific data */ 221 } __packed; 222 223 /* Type 0 Routing header, deprecated by RFC 5095. */ 224 struct ip6_rthdr0 { 225 u_int8_t ip6r0_nxt; /* next header */ 226 u_int8_t ip6r0_len; /* length in units of 8 octets */ 227 u_int8_t ip6r0_type; /* always zero */ 228 u_int8_t ip6r0_segleft; /* segments left */ 229 u_int32_t ip6r0_reserved; /* reserved field */ 230 /* followed by up to 127 struct in6_addr */ 231 } __packed; 232 233 /* Fragment header */ 234 struct ip6_frag { 235 u_int8_t ip6f_nxt; /* next header */ 236 u_int8_t ip6f_reserved; /* reserved field */ 237 u_int16_t ip6f_offlg; /* offset, reserved, and flag */ 238 u_int32_t ip6f_ident; /* identification */ 239 } __packed; 240 241 #if BYTE_ORDER == BIG_ENDIAN 242 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */ 243 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */ 244 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */ 245 #else /* BYTE_ORDER == LITTLE_ENDIAN */ 246 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */ 247 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */ 248 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */ 249 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 250 251 /* 252 * Internet implementation parameters. 253 */ 254 #define IPV6_MAXHLIM 255 /* maximum hoplimit */ 255 #define IPV6_DEFHLIM 64 /* default hlim */ 256 #define IPV6_DEFFRAGTTL 60000 /* Default fragment packets lifetime, in milliseconds */ 257 #define IPV6_HLIMDEC 1 /* subtracted when forwarding */ 258 259 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */ 260 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/ 261 #define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */ 262 263 #endif /* not _NETINET_IP6_H_ */ 264