master
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
73struct 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
118struct 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? */
125struct 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? */
133struct 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 */
167struct ip6_opt {
168 u_int8_t ip6o_type;
169 u_int8_t ip6o_len;
170} __packed;
171
172/* Jumbo Payload Option */
173struct 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 */
181struct 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 */
191struct 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 */
198struct 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 */
217struct 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. */
226struct 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 */
236struct 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_ */