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 20 108 109 #define IPV6_TRAFFIC_CLASS(ip6) ((ntohl((ip6)->ip6_flow) >> 20) & 0xff) 110 #define IPV6_DSCP(ip6) ((ntohl((ip6)->ip6_flow) >> 20) & 0xfc) 111 #define IPV6_ECN(ip6) ((ntohl((ip6)->ip6_flow) >> 20) & 0x03) 112 113 /* 114 * Extension Headers 115 */ 116 117 struct ip6_ext { 118 u_int8_t ip6e_nxt; 119 u_int8_t ip6e_len; 120 } __packed; 121 122 /* Hop-by-Hop options header */ 123 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 124 struct ip6_hbh { 125 u_int8_t ip6h_nxt; /* next header */ 126 u_int8_t ip6h_len; /* length in units of 8 octets */ 127 /* followed by options */ 128 } __packed; 129 130 /* Destination options header */ 131 /* XXX should we pad it to force alignment on an 8-byte boundary? */ 132 struct ip6_dest { 133 u_int8_t ip6d_nxt; /* next header */ 134 u_int8_t ip6d_len; /* length in units of 8 octets */ 135 /* followed by options */ 136 } __packed; 137 138 /* Option types and related macros */ 139 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */ 140 #define IP6OPT_PADN 0x01 /* 00 0 00001 */ 141 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ 142 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */ 143 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */ 144 #ifndef _KERNEL 145 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */ 146 #endif 147 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */ 148 149 #define IP6OPT_RTALERT_LEN 4 150 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ 151 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ 152 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ 153 #define IP6OPT_MINLEN 2 154 155 #define IP6OPT_EID 0x8a /* 10 0 01010 */ 156 157 #define IP6OPT_TYPE(o) ((o) & 0xC0) 158 #define IP6OPT_TYPE_SKIP 0x00 159 #define IP6OPT_TYPE_DISCARD 0x40 160 #define IP6OPT_TYPE_FORCEICMP 0x80 161 #define IP6OPT_TYPE_ICMP 0xC0 162 163 #define IP6OPT_MUTABLE 0x20 164 165 /* IPv6 options: common part */ 166 struct ip6_opt { 167 u_int8_t ip6o_type; 168 u_int8_t ip6o_len; 169 } __packed; 170 171 /* Jumbo Payload Option */ 172 struct ip6_opt_jumbo { 173 u_int8_t ip6oj_type; 174 u_int8_t ip6oj_len; 175 u_int8_t ip6oj_jumbo_len[4]; 176 } __packed; 177 #define IP6OPT_JUMBO_LEN 6 178 179 /* NSAP Address Option */ 180 struct ip6_opt_nsap { 181 u_int8_t ip6on_type; 182 u_int8_t ip6on_len; 183 u_int8_t ip6on_src_nsap_len; 184 u_int8_t ip6on_dst_nsap_len; 185 /* followed by source NSAP */ 186 /* followed by destination NSAP */ 187 } __packed; 188 189 /* Tunnel Limit Option */ 190 struct ip6_opt_tunnel { 191 u_int8_t ip6ot_type; 192 u_int8_t ip6ot_len; 193 u_int8_t ip6ot_encap_limit; 194 } __packed; 195 196 /* Router Alert Option */ 197 struct ip6_opt_router { 198 u_int8_t ip6or_type; 199 u_int8_t ip6or_len; 200 u_int8_t ip6or_value[2]; 201 } __packed; 202 /* Router alert values (in network byte order) */ 203 #if BYTE_ORDER == BIG_ENDIAN 204 #define IP6_ALERT_MLD 0x0000 205 #define IP6_ALERT_RSVP 0x0001 206 #define IP6_ALERT_AN 0x0002 207 #else 208 #if BYTE_ORDER == LITTLE_ENDIAN 209 #define IP6_ALERT_MLD 0x0000 210 #define IP6_ALERT_RSVP 0x0100 211 #define IP6_ALERT_AN 0x0200 212 #endif /* LITTLE_ENDIAN */ 213 #endif 214 215 /* Routing header */ 216 struct ip6_rthdr { 217 u_int8_t ip6r_nxt; /* next header */ 218 u_int8_t ip6r_len; /* length in units of 8 octets */ 219 u_int8_t ip6r_type; /* routing type */ 220 u_int8_t ip6r_segleft; /* segments left */ 221 /* followed by routing type specific data */ 222 } __packed; 223 224 /* Type 0 Routing header, deprecated by RFC 5095. */ 225 struct ip6_rthdr0 { 226 u_int8_t ip6r0_nxt; /* next header */ 227 u_int8_t ip6r0_len; /* length in units of 8 octets */ 228 u_int8_t ip6r0_type; /* always zero */ 229 u_int8_t ip6r0_segleft; /* segments left */ 230 u_int32_t ip6r0_reserved; /* reserved field */ 231 /* followed by up to 127 struct in6_addr */ 232 } __packed; 233 234 /* Fragment header */ 235 struct ip6_frag { 236 u_int8_t ip6f_nxt; /* next header */ 237 u_int8_t ip6f_reserved; /* reserved field */ 238 u_int16_t ip6f_offlg; /* offset, reserved, and flag */ 239 u_int32_t ip6f_ident; /* identification */ 240 } __packed; 241 242 #if BYTE_ORDER == BIG_ENDIAN 243 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */ 244 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */ 245 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */ 246 #else /* BYTE_ORDER == LITTLE_ENDIAN */ 247 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */ 248 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */ 249 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */ 250 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 251 252 /* 253 * Internet implementation parameters. 254 */ 255 #define IPV6_MAXHLIM 255 /* maximum hoplimit */ 256 #define IPV6_DEFHLIM 64 /* default hlim */ 257 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */ 258 #define IPV6_HLIMDEC 1 /* subtracted when forwarding */ 259 260 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */ 261 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/ 262 #define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */ 263 264 #endif /* not _NETINET_IP6_H_ */ 265