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
71struct 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
116struct 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? */
123struct 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? */
131struct 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 */
165struct ip6_opt {
166 u_int8_t ip6o_type;
167 u_int8_t ip6o_len;
168} __packed;
169
170/* Jumbo Payload Option */
171struct 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 */
179struct 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 */
189struct 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 */
196struct 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 */
215struct 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. */
224struct 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 */
234struct 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_ */