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1 /* @(#) $Header: /tcpdump/master/tcpdump/ip6.h,v 1.6.4.1 2005/04/20 10:04:37 guy Exp $ (LBL) */
2 /*	$NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp $	*/
3 /*	$KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun Exp $	*/
4 
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. All advertising materials mentioning features or use of this software
47  *    must display the following acknowledgement:
48  *	This product includes software developed by the University of
49  *	California, Berkeley and its contributors.
50  * 4. Neither the name of the University nor the names of its contributors
51  *    may be used to endorse or promote products derived from this software
52  *    without specific prior written permission.
53  *
54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64  * SUCH DAMAGE.
65  *
66  *	@(#)ip.h	8.1 (Berkeley) 6/10/93
67  */
68 
69 #ifndef _NETINET_IP6_H_
70 #define _NETINET_IP6_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 /* in network endian */
99 #define IPV6_FLOWINFO_MASK	((u_int32_t)htonl(0x0fffffff))	/* flow info (28 bits) */
100 #define IPV6_FLOWLABEL_MASK	((u_int32_t)htonl(0x000fffff))	/* flow label (20 bits) */
101 #if 1
102 /* ECN bits proposed by Sally Floyd */
103 #define IP6TOS_CE		0x01	/* congestion experienced */
104 #define IP6TOS_ECT		0x02	/* ECN-capable transport */
105 #endif
106 
107 /*
108  * Extension Headers
109  */
110 
111 struct	ip6_ext {
112 	u_char	ip6e_nxt;
113 	u_char	ip6e_len;
114 };
115 
116 /* Hop-by-Hop options header */
117 /* XXX should we pad it to force alignment on an 8-byte boundary? */
118 struct ip6_hbh {
119 	u_int8_t ip6h_nxt;	/* next header */
120 	u_int8_t ip6h_len;	/* length in units of 8 octets */
121 	/* followed by options */
122 };
123 
124 /* Destination options header */
125 /* XXX should we pad it to force alignment on an 8-byte boundary? */
126 struct ip6_dest {
127 	u_int8_t ip6d_nxt;	/* next header */
128 	u_int8_t ip6d_len;	/* length in units of 8 octets */
129 	/* followed by options */
130 };
131 
132 /* Option types and related macros */
133 #define IP6OPT_PAD1		0x00	/* 00 0 00000 */
134 #define IP6OPT_PADN		0x01	/* 00 0 00001 */
135 #define IP6OPT_JUMBO		0xC2	/* 11 0 00010 = 194 */
136 #define IP6OPT_JUMBO_LEN	6
137 #define IP6OPT_ROUTER_ALERT	0x05	/* 00 0 00101 */
138 
139 #define IP6OPT_RTALERT_LEN	4
140 #define IP6OPT_RTALERT_MLD	0	/* Datagram contains an MLD message */
141 #define IP6OPT_RTALERT_RSVP	1	/* Datagram contains an RSVP message */
142 #define IP6OPT_RTALERT_ACTNET	2 	/* contains an Active Networks msg */
143 #define IP6OPT_MINLEN		2
144 
145 #define IP6OPT_BINDING_UPDATE	0xc6	/* 11 0 00110 */
146 #define IP6OPT_BINDING_ACK	0x07	/* 00 0 00111 */
147 #define IP6OPT_BINDING_REQ	0x08	/* 00 0 01000 */
148 #define IP6OPT_HOME_ADDRESS	0xc9	/* 11 0 01001 */
149 #define IP6OPT_EID		0x8a	/* 10 0 01010 */
150 
151 #define IP6OPT_TYPE(o)		((o) & 0xC0)
152 #define IP6OPT_TYPE_SKIP	0x00
153 #define IP6OPT_TYPE_DISCARD	0x40
154 #define IP6OPT_TYPE_FORCEICMP	0x80
155 #define IP6OPT_TYPE_ICMP	0xC0
156 
157 #define IP6OPT_MUTABLE		0x20
158 
159 /* Routing header */
160 struct ip6_rthdr {
161 	u_int8_t  ip6r_nxt;	/* next header */
162 	u_int8_t  ip6r_len;	/* length in units of 8 octets */
163 	u_int8_t  ip6r_type;	/* routing type */
164 	u_int8_t  ip6r_segleft;	/* segments left */
165 	/* followed by routing type specific data */
166 };
167 
168 /* Type 0 Routing header */
169 struct ip6_rthdr0 {
170 	u_int8_t  ip6r0_nxt;		/* next header */
171 	u_int8_t  ip6r0_len;		/* length in units of 8 octets */
172 	u_int8_t  ip6r0_type;		/* always zero */
173 	u_int8_t  ip6r0_segleft;	/* segments left */
174 	u_int8_t  ip6r0_reserved;	/* reserved field */
175 	u_int8_t  ip6r0_slmap[3];	/* strict/loose bit map */
176 	struct in6_addr ip6r0_addr[1];	/* up to 23 addresses */
177 };
178 
179 /* Fragment header */
180 struct ip6_frag {
181 	u_int8_t  ip6f_nxt;		/* next header */
182 	u_int8_t  ip6f_reserved;	/* reserved field */
183 	u_int16_t ip6f_offlg;		/* offset, reserved, and flag */
184 	u_int32_t ip6f_ident;		/* identification */
185 };
186 
187 #define IP6F_OFF_MASK		0xfff8	/* mask out offset from ip6f_offlg */
188 #define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
189 #define IP6F_MORE_FRAG		0x0001	/* more-fragments flag */
190 
191 #endif /* not _NETINET_IP6_H_ */
192