FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip6.h
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_ */
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