1 /* NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp */ 2 /* $KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun 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. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip.h 8.1 (Berkeley) 6/10/93 66 */ 67 68 #ifndef ND_IP6_H_ 69 #define ND_IP6_H_ 70 71 /* 72 * Definition for internet protocol version 6. 73 * RFC 2460 74 */ 75 76 struct ip6_hdr { 77 union { 78 struct ip6_hdrctl { 79 nd_uint32_t ip6_un1_flow; /* 20 bits of flow-ID */ 80 nd_uint16_t ip6_un1_plen; /* payload length */ 81 nd_uint8_t ip6_un1_nxt; /* next header */ 82 nd_uint8_t ip6_un1_hlim; /* hop limit */ 83 } ip6_un1; 84 nd_uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */ 85 } ip6_ctlun; 86 nd_ipv6 ip6_src; /* source address */ 87 nd_ipv6 ip6_dst; /* destination address */ 88 }; 89 90 #define ip6_vfc ip6_ctlun.ip6_un2_vfc 91 #define IP6_VERSION(ip6_hdr) ((GET_U_1((ip6_hdr)->ip6_vfc) & 0xf0) >> 4) 92 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow 93 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen 94 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt 95 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim 96 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim 97 98 /* in network endian */ 99 #define IPV6_FLOWINFO_MASK ((uint32_t)htonl(0x0fffffff)) /* flow info (28 bits) */ 100 #define IPV6_FLOWLABEL_MASK ((uint32_t)htonl(0x000fffff)) /* flow label (20 bits) */ 101 102 /* 103 * Extension Headers 104 */ 105 106 struct ip6_ext { 107 nd_uint8_t ip6e_nxt; 108 nd_uint8_t ip6e_len; 109 }; 110 111 /* Hop-by-Hop options header */ 112 struct ip6_hbh { 113 nd_uint8_t ip6h_nxt; /* next header */ 114 nd_uint8_t ip6h_len; /* length in units of 8 octets */ 115 /* followed by options */ 116 }; 117 118 /* Destination options header */ 119 struct ip6_dest { 120 nd_uint8_t ip6d_nxt; /* next header */ 121 nd_uint8_t ip6d_len; /* length in units of 8 octets */ 122 /* followed by options */ 123 }; 124 125 /* https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml */ 126 127 /* Option types and related macros */ 128 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */ 129 #define IP6OPT_PADN 0x01 /* 00 0 00001 */ 130 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */ 131 #define IP6OPT_JUMBO_LEN 6 132 #define IP6OPT_RPL 0x63 /* 01 1 00011 */ 133 #define IP6OPT_TUN_ENC_LIMIT 0x04 /* 00 0 00100 */ 134 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 */ 135 136 #define IP6OPT_RTALERT_LEN 4 137 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */ 138 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */ 139 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */ 140 #define IP6OPT_MINLEN 2 141 142 #define IP6OPT_QUICK_START 0x26 /* 00 1 00110 */ 143 #define IP6OPT_CALIPSO 0x07 /* 00 0 00111 */ 144 #define IP6OPT_SMF_DPD 0x08 /* 00 0 01000 */ 145 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */ 146 #define IP6OPT_HOMEADDR_MINLEN 18 147 #define IP6OPT_EID 0x8a /* 10 0 01010 */ 148 #define IP6OPT_ILNP_NOTICE 0x8b /* 10 0 01011 */ 149 #define IP6OPT_LINE_ID 0x8c /* 10 0 01100 */ 150 #define IP6OPT_MPL 0x6d /* 01 1 01101 */ 151 #define IP6OPT_IP_DFF 0xee /* 11 1 01110 */ 152 153 #define IP6OPT_TYPE(o) ((o) & 0xC0) 154 #define IP6OPT_TYPE_SKIP 0x00 155 #define IP6OPT_TYPE_DISCARD 0x40 156 #define IP6OPT_TYPE_FORCEICMP 0x80 157 #define IP6OPT_TYPE_ICMP 0xC0 158 159 #define IP6OPT_MUTABLE 0x20 160 161 /* Routing header */ 162 struct ip6_rthdr { 163 nd_uint8_t ip6r_nxt; /* next header */ 164 nd_uint8_t ip6r_len; /* length in units of 8 octets */ 165 nd_uint8_t ip6r_type; /* routing type */ 166 nd_uint8_t ip6r_segleft; /* segments left */ 167 /* followed by routing type specific data */ 168 }; 169 170 #define IPV6_RTHDR_TYPE_0 0 171 #define IPV6_RTHDR_TYPE_2 2 172 #define IPV6_RTHDR_TYPE_4 4 173 174 /* Type 0 Routing header */ 175 /* Also used for Type 2 */ 176 struct ip6_rthdr0 { 177 nd_uint8_t ip6r0_nxt; /* next header */ 178 nd_uint8_t ip6r0_len; /* length in units of 8 octets */ 179 nd_uint8_t ip6r0_type; /* always zero */ 180 nd_uint8_t ip6r0_segleft; /* segments left */ 181 nd_uint32_t ip6r0_reserved; /* reserved field */ 182 nd_ipv6 ip6r0_addr[1]; /* up to 23 addresses */ 183 }; 184 185 /** 186 * Type 4 Routing header 187 * known as Segment Routing Header 'SRH' 188 */ 189 struct ip6_srh { 190 nd_uint8_t srh_nxt; /* next header */ 191 nd_uint8_t srh_len; /* length in units of 8 octets */ 192 nd_uint8_t srh_type; /* Routing Type 4 */ 193 nd_uint8_t srh_segleft; /* segments left */ 194 nd_uint8_t srh_last_ent; /* Last Entry*/ 195 nd_uint8_t srh_flags; /* Flags */ 196 nd_uint16_t srh_tag; /* Tag */ 197 nd_ipv6 srh_segments[1]; /* SRH segments list*/ 198 }; 199 200 /* Fragment header */ 201 struct ip6_frag { 202 nd_uint8_t ip6f_nxt; /* next header */ 203 nd_uint8_t ip6f_reserved; /* reserved field */ 204 nd_uint16_t ip6f_offlg; /* offset, reserved, and flag */ 205 nd_uint32_t ip6f_ident; /* identification */ 206 }; 207 208 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from ip6f_offlg */ 209 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */ 210 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */ 211 212 #endif /* not ND_IP6_H_ */ 213