1 /*	NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp 	*/
2 /*	$KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun 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. All advertising materials mentioning features or use of this software
46  *    must display the following acknowledgement:
47  *	This product includes software developed by the University of
48  *	California, Berkeley and its contributors.
49  * 4. Neither the name of the University nor the names of its contributors
50  *    may be used to endorse or promote products derived from this software
51  *    without specific prior written permission.
52  *
53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63  * SUCH DAMAGE.
64  *
65  *	@(#)ip.h	8.1 (Berkeley) 6/10/93
66  */
67 
68 #ifndef _NETINET_IP6_H_
69 #define _NETINET_IP6_H_
70 
71 /*
72  * Definition for internet protocol version 6.
73  * RFC 2460
74  */
75 
76 struct ip6_hdr {
77 	union {
78 		struct ip6_hdrctl {
79 			uint32_t ip6_un1_flow;	/* 20 bits of flow-ID */
80 			uint16_t ip6_un1_plen;	/* payload length */
81 			uint8_t  ip6_un1_nxt;	/* next header */
82 			uint8_t  ip6_un1_hlim;	/* hop limit */
83 		} ip6_un1;
84 		uint8_t ip6_un2_vfc;	/* 4 bits version, top 4 bits class */
85 	} ip6_ctlun;
86 	struct in6_addr ip6_src;	/* source address */
87 	struct in6_addr ip6_dst;	/* destination address */
88 } UNALIGNED;
89 
90 #define ip6_vfc		ip6_ctlun.ip6_un2_vfc
91 #define IP6_VERSION(ip6_hdr)	(((ip6_hdr)->ip6_vfc & 0xf0) >> 4)
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	((uint32_t)htonl(0x0fffffff))	/* flow info (28 bits) */
100 #define IPV6_FLOWLABEL_MASK	((uint32_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 	uint8_t ip6e_nxt;
113 	uint8_t ip6e_len;
114 } UNALIGNED;
115 
116 /* Hop-by-Hop options header */
117 struct ip6_hbh {
118 	uint8_t ip6h_nxt;	/* next header */
119 	uint8_t ip6h_len;	/* length in units of 8 octets */
120 	/* followed by options */
121 } UNALIGNED;
122 
123 /* Destination options header */
124 struct ip6_dest {
125 	uint8_t ip6d_nxt;	/* next header */
126 	uint8_t ip6d_len;	/* length in units of 8 octets */
127 	/* followed by options */
128 } UNALIGNED;
129 
130 /* http://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml */
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_RPL		0x63	/* 01 1 00011 */
138 #define IP6OPT_TUN_ENC_LIMIT	0x04	/* 00 0 00100 */
139 #define IP6OPT_ROUTER_ALERT	0x05	/* 00 0 00101 */
140 
141 #define IP6OPT_RTALERT_LEN	4
142 #define IP6OPT_RTALERT_MLD	0	/* Datagram contains an MLD message */
143 #define IP6OPT_RTALERT_RSVP	1	/* Datagram contains an RSVP message */
144 #define IP6OPT_RTALERT_ACTNET	2 	/* contains an Active Networks msg */
145 #define IP6OPT_MINLEN		2
146 
147 #define IP6OPT_QUICK_START	0x26	/* 00 1 00110 */
148 #define IP6OPT_CALIPSO		0x07	/* 00 0 00111 */
149 #define IP6OPT_SMF_DPD		0x08	/* 00 0 01000 */
150 #define IP6OPT_HOME_ADDRESS	0xc9	/* 11 0 01001 */
151 #define IP6OPT_HOMEADDR_MINLEN	18
152 #define IP6OPT_EID		0x8a	/* 10 0 01010 */
153 #define IP6OPT_ILNP_NOTICE	0x8b	/* 10 0 01011 */
154 #define IP6OPT_LINE_ID		0x8c	/* 10 0 01100 */
155 #define IP6OPT_MPL		0x6d	/* 01 1 01101 */
156 #define IP6OPT_IP_DFF		0xee	/* 11 1 01110 */
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 /* Routing header */
167 struct ip6_rthdr {
168 	uint8_t  ip6r_nxt;	/* next header */
169 	uint8_t  ip6r_len;	/* length in units of 8 octets */
170 	uint8_t  ip6r_type;	/* routing type */
171 	uint8_t  ip6r_segleft;	/* segments left */
172 	/* followed by routing type specific data */
173 } UNALIGNED;
174 
175 #define IPV6_RTHDR_TYPE_0 0
176 #define IPV6_RTHDR_TYPE_2 2
177 
178 /* Type 0 Routing header */
179 /* Also used for Type 2 */
180 struct ip6_rthdr0 {
181 	nd_uint8_t  ip6r0_nxt;		/* next header */
182 	nd_uint8_t  ip6r0_len;		/* length in units of 8 octets */
183 	nd_uint8_t  ip6r0_type;		/* always zero */
184 	nd_uint8_t  ip6r0_segleft;	/* segments left */
185 	nd_uint32_t ip6r0_reserved;	/* reserved field */
186 	struct in6_addr ip6r0_addr[1];	/* up to 23 addresses */
187 };
188 
189 /* Fragment header */
190 struct ip6_frag {
191 	uint8_t  ip6f_nxt;		/* next header */
192 	uint8_t  ip6f_reserved;	/* reserved field */
193 	uint16_t ip6f_offlg;		/* offset, reserved, and flag */
194 	uint32_t ip6f_ident;		/* identification */
195 } UNALIGNED;
196 
197 #define IP6F_OFF_MASK		0xfff8	/* mask out offset from ip6f_offlg */
198 #define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
199 #define IP6F_MORE_FRAG		0x0001	/* more-fragments flag */
200 
201 #endif /* not _NETINET_IP6_H_ */
202