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