FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip6.h
1 /* $NetBSD: ip6.h,v 1.30 2021/03/07 15:01:00 christos Exp $ */
2 /* $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi 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 _NETINET_IP6_H_
65 #define _NETINET_IP6_H_
66
67 #include <sys/types.h>
68 #include <sys/endian.h>
69
70 #include <netinet/in.h>
71
72 /*
73 * Definition for internet protocol version 6.
74 * RFC 2460
75 */
76
77 struct ip6_hdr {
78 union {
79 struct ip6_hdrctl {
80 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
81 u_int16_t ip6_un1_plen; /* payload length */
82 u_int8_t ip6_un1_nxt; /* next header */
83 u_int8_t ip6_un1_hlim; /* hop limit */
84 } ip6_un1;
85 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
86 } ip6_ctlun;
87 struct in6_addr ip6_src; /* source address */
88 struct in6_addr ip6_dst; /* destination address */
89 };
90
91 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
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 #define IPV6_VERSION 0x60
99 #define IPV6_VERSION_MASK 0xf0
100
101 #if BYTE_ORDER == BIG_ENDIAN
102 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
103 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
104 #else
105 #if BYTE_ORDER == LITTLE_ENDIAN
106 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
107 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
108 #endif /* LITTLE_ENDIAN */
109 #endif
110 #if 1
111 /* ECN bits proposed by Sally Floyd */
112 #define IP6TOS_CE 0x01 /* congestion experienced */
113 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
114 #endif
115
116 #ifdef _KERNEL
117 /*
118 * for IPv6 pseudo header checksum
119 * XXX nonstandard
120 */
121 struct ip6_hdr_pseudo {
122 struct in6_addr ip6ph_src;
123 struct in6_addr ip6ph_dst;
124 u_int32_t ip6ph_len;
125 u_int8_t ip6ph_zero[3];
126 u_int8_t ip6ph_nxt;
127 };
128 __CTASSERT(sizeof(struct ip6_hdr) == 40);
129 __CTASSERT(sizeof(struct ip6_hdr_pseudo) == 40);
130 #endif
131
132 /*
133 * Extension Headers
134 */
135
136 struct ip6_ext {
137 u_int8_t ip6e_nxt;
138 u_int8_t ip6e_len;
139 };
140
141 /* Hop-by-Hop options header */
142 struct ip6_hbh {
143 u_int8_t ip6h_nxt; /* next header */
144 u_int8_t ip6h_len; /* length in units of 8 octets */
145 /* followed by options */
146 };
147
148 /* Destination options header */
149 struct ip6_dest {
150 u_int8_t ip6d_nxt; /* next header */
151 u_int8_t ip6d_len; /* length in units of 8 octets */
152 /* followed by options */
153 };
154
155 /* Option types and related macros */
156 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
157 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
158 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
159 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
160 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
161 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
162 #define IP6OPT_ROUTER_ALERT 0x05 /* (RFC3542 def, recommended) */
163
164 #define IP6OPT_RTALERT_LEN 4
165 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
166 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
167 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
168 #define IP6OPT_MINLEN 2
169
170 #define IP6OPT_TYPE(o) ((o) & 0xC0)
171 #define IP6OPT_TYPE_SKIP 0x00
172 #define IP6OPT_TYPE_DISCARD 0x40
173 #define IP6OPT_TYPE_FORCEICMP 0x80
174 #define IP6OPT_TYPE_ICMP 0xC0
175
176 #define IP6OPT_MUTABLE 0x20
177
178 /* IPv6 options: common part */
179 struct ip6_opt {
180 u_int8_t ip6o_type;
181 u_int8_t ip6o_len;
182 };
183
184 /* Jumbo Payload Option */
185 struct ip6_opt_jumbo {
186 u_int8_t ip6oj_type;
187 u_int8_t ip6oj_len;
188 u_int8_t ip6oj_jumbo_len[4];
189 };
190 #define IP6OPT_JUMBO_LEN 6
191
192 /* NSAP Address Option */
193 struct ip6_opt_nsap {
194 u_int8_t ip6on_type;
195 u_int8_t ip6on_len;
196 u_int8_t ip6on_src_nsap_len;
197 u_int8_t ip6on_dst_nsap_len;
198 /* followed by source NSAP */
199 /* followed by destination NSAP */
200 };
201
202 /* Tunnel Limit Option */
203 struct ip6_opt_tunnel {
204 u_int8_t ip6ot_type;
205 u_int8_t ip6ot_len;
206 u_int8_t ip6ot_encap_limit;
207 };
208
209 /* Router Alert Option */
210 struct ip6_opt_router {
211 u_int8_t ip6or_type;
212 u_int8_t ip6or_len;
213 u_int8_t ip6or_value[2];
214 };
215 /* Router alert values (in network byte order) */
216 #if BYTE_ORDER == BIG_ENDIAN
217 #define IP6_ALERT_MLD 0x0000
218 #define IP6_ALERT_RSVP 0x0001
219 #define IP6_ALERT_AN 0x0002
220 #else
221 #if BYTE_ORDER == LITTLE_ENDIAN
222 #define IP6_ALERT_MLD 0x0000
223 #define IP6_ALERT_RSVP 0x0100
224 #define IP6_ALERT_AN 0x0200
225 #endif /* LITTLE_ENDIAN */
226 #endif
227
228 /* Routing header */
229 struct ip6_rthdr {
230 u_int8_t ip6r_nxt; /* next header */
231 u_int8_t ip6r_len; /* length in units of 8 octets */
232 u_int8_t ip6r_type; /* routing type */
233 u_int8_t ip6r_segleft; /* segments left */
234 /* followed by routing type specific data */
235 };
236
237 /* Type 0 Routing header */
238 struct ip6_rthdr0 {
239 u_int8_t ip6r0_nxt; /* next header */
240 u_int8_t ip6r0_len; /* length in units of 8 octets */
241 u_int8_t ip6r0_type; /* always zero */
242 u_int8_t ip6r0_segleft; /* segments left */
243 u_int32_t ip6r0_reserved; /* reserved field */
244 };
245
246 /* Fragment header */
247 struct ip6_frag {
248 u_int8_t ip6f_nxt; /* next header */
249 u_int8_t ip6f_reserved; /* reserved field */
250 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
251 u_int32_t ip6f_ident; /* identification */
252 };
253
254 #if BYTE_ORDER == BIG_ENDIAN
255 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
256 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
257 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
258 #else /* BYTE_ORDER == LITTLE_ENDIAN */
259 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
260 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
261 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
262 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
263
264 /*
265 * Internet implementation parameters.
266 */
267 #define IPV6_MAXHLIM 255 /* maximum hoplimit */
268 #define IPV6_DEFHLIM 64 /* default hlim */
269 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
270 #define IPV6_HLIMDEC 1 /* subtracted when forwarding */
271
272 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
273 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
274
275 #ifdef _KERNEL
276 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
277 M_REGION_GET(val, typ, m, off, len)
278 #endif /*_KERNEL*/
279
280 #endif /* !_NETINET_IP6_H_ */
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