tcpdump  4.99.1
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ip6.h
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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 ND_IP6_H_
69 #define ND_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  nd_uint32_t ip6_un1_flow; /* 20 bits of flow-ID */
80  nd_uint16_t ip6_un1_plen; /* payload length */
81  nd_uint8_t ip6_un1_nxt; /* next header */
82  nd_uint8_t ip6_un1_hlim; /* hop limit */
84  nd_uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
86  nd_ipv6 ip6_src; /* source address */
87  nd_ipv6 ip6_dst; /* destination address */
88 };
89 
90 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
91 #define IP6_VERSION(ip6_hdr) ((GET_U_1((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 
102 /*
103  * Extension Headers
104  */
105 
106 struct ip6_ext {
109 };
110 
111 /* Hop-by-Hop options header */
112 struct ip6_hbh {
113  nd_uint8_t ip6h_nxt; /* next header */
114  nd_uint8_t ip6h_len; /* length in units of 8 octets */
115  /* followed by options */
116 };
117 
118 /* Destination options header */
119 struct ip6_dest {
120  nd_uint8_t ip6d_nxt; /* next header */
121  nd_uint8_t ip6d_len; /* length in units of 8 octets */
122  /* followed by options */
123 };
124 
125 /* https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml */
126 
127 /* Option types and related macros */
128 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
129 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
130 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
131 #define IP6OPT_JUMBO_LEN 6
132 #define IP6OPT_RPL 0x63 /* 01 1 00011 */
133 #define IP6OPT_TUN_ENC_LIMIT 0x04 /* 00 0 00100 */
134 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 */
135 
136 #define IP6OPT_RTALERT_LEN 4
137 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
138 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
139 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
140 #define IP6OPT_MINLEN 2
141 
142 #define IP6OPT_QUICK_START 0x26 /* 00 1 00110 */
143 #define IP6OPT_CALIPSO 0x07 /* 00 0 00111 */
144 #define IP6OPT_SMF_DPD 0x08 /* 00 0 01000 */
145 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
146 #define IP6OPT_HOMEADDR_MINLEN 18
147 #define IP6OPT_EID 0x8a /* 10 0 01010 */
148 #define IP6OPT_ILNP_NOTICE 0x8b /* 10 0 01011 */
149 #define IP6OPT_LINE_ID 0x8c /* 10 0 01100 */
150 #define IP6OPT_MPL 0x6d /* 01 1 01101 */
151 #define IP6OPT_IP_DFF 0xee /* 11 1 01110 */
152 
153 #define IP6OPT_TYPE(o) ((o) & 0xC0)
154 #define IP6OPT_TYPE_SKIP 0x00
155 #define IP6OPT_TYPE_DISCARD 0x40
156 #define IP6OPT_TYPE_FORCEICMP 0x80
157 #define IP6OPT_TYPE_ICMP 0xC0
158 
159 #define IP6OPT_MUTABLE 0x20
160 
161 /* Routing header */
162 struct ip6_rthdr {
163  nd_uint8_t ip6r_nxt; /* next header */
164  nd_uint8_t ip6r_len; /* length in units of 8 octets */
165  nd_uint8_t ip6r_type; /* routing type */
166  nd_uint8_t ip6r_segleft; /* segments left */
167  /* followed by routing type specific data */
168 };
169 
170 #define IPV6_RTHDR_TYPE_0 0
171 #define IPV6_RTHDR_TYPE_2 2
172 #define IPV6_RTHDR_TYPE_4 4
173 
174 /* Type 0 Routing header */
175 /* Also used for Type 2 */
176 struct ip6_rthdr0 {
177  nd_uint8_t ip6r0_nxt; /* next header */
178  nd_uint8_t ip6r0_len; /* length in units of 8 octets */
179  nd_uint8_t ip6r0_type; /* always zero */
180  nd_uint8_t ip6r0_segleft; /* segments left */
181  nd_uint32_t ip6r0_reserved; /* reserved field */
182  nd_ipv6 ip6r0_addr[1]; /* up to 23 addresses */
183 };
184 
185 /**
186  * Type 4 Routing header
187  * known as Segment Routing Header 'SRH'
188  */
189 struct ip6_srh {
190  nd_uint8_t srh_nxt; /* next header */
191  nd_uint8_t srh_len; /* length in units of 8 octets */
192  nd_uint8_t srh_type; /* Routing Type 4 */
193  nd_uint8_t srh_segleft; /* segments left */
194  nd_uint8_t srh_last_ent; /* Last Entry*/
195  nd_uint8_t srh_flags; /* Flags */
196  nd_uint16_t srh_tag; /* Tag */
197  nd_ipv6 srh_segments[1]; /* SRH segments list*/
198 };
199 
200 /* Fragment header */
201 struct ip6_frag {
202  nd_uint8_t ip6f_nxt; /* next header */
203  nd_uint8_t ip6f_reserved; /* reserved field */
204  nd_uint16_t ip6f_offlg; /* offset, reserved, and flag */
205  nd_uint32_t ip6f_ident; /* identification */
206 };
207 
208 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from ip6f_offlg */
209 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
210 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
211 
212 #endif /* not ND_IP6_H_ */
unsigned char nd_uint16_t[2]
Definition: netdissect.h:47
unsigned char nd_uint32_t[4]
Definition: netdissect.h:49
unsigned char nd_uint8_t[1]
Definition: netdissect.h:46
unsigned char nd_ipv6[16]
Definition: netdissect.h:97
Definition: ip6.h:119
nd_uint8_t ip6d_len
Definition: ip6.h:121
nd_uint8_t ip6d_nxt
Definition: ip6.h:120
Definition: ip6.h:106
nd_uint8_t ip6e_len
Definition: ip6.h:108
nd_uint8_t ip6e_nxt
Definition: ip6.h:107
Definition: ip6.h:201
nd_uint16_t ip6f_offlg
Definition: ip6.h:204
nd_uint32_t ip6f_ident
Definition: ip6.h:205
nd_uint8_t ip6f_reserved
Definition: ip6.h:203
nd_uint8_t ip6f_nxt
Definition: ip6.h:202
Definition: ip6.h:112
nd_uint8_t ip6h_nxt
Definition: ip6.h:113
nd_uint8_t ip6h_len
Definition: ip6.h:114
Definition: ip6.h:76
struct ip6_hdr::@1::ip6_hdrctl ip6_un1
nd_uint8_t ip6_un2_vfc
Definition: ip6.h:84
union ip6_hdr::@1 ip6_ctlun
nd_ipv6 ip6_dst
Definition: ip6.h:87
nd_ipv6 ip6_src
Definition: ip6.h:86
nd_uint8_t ip6_un1_hlim
Definition: ip6.h:82
nd_uint32_t ip6_un1_flow
Definition: ip6.h:79
nd_uint8_t ip6_un1_nxt
Definition: ip6.h:81
nd_uint16_t ip6_un1_plen
Definition: ip6.h:80
nd_uint8_t ip6r0_len
Definition: ip6.h:178
nd_ipv6 ip6r0_addr[1]
Definition: ip6.h:182
nd_uint8_t ip6r0_segleft
Definition: ip6.h:180
nd_uint32_t ip6r0_reserved
Definition: ip6.h:181
nd_uint8_t ip6r0_nxt
Definition: ip6.h:177
nd_uint8_t ip6r0_type
Definition: ip6.h:179
Definition: ip6.h:162
nd_uint8_t ip6r_nxt
Definition: ip6.h:163
nd_uint8_t ip6r_type
Definition: ip6.h:165
nd_uint8_t ip6r_segleft
Definition: ip6.h:166
nd_uint8_t ip6r_len
Definition: ip6.h:164
Definition: ip6.h:189
nd_uint8_t srh_nxt
Definition: ip6.h:190
nd_uint8_t srh_segleft
Definition: ip6.h:193
nd_uint8_t srh_len
Definition: ip6.h:191
nd_uint8_t srh_flags
Definition: ip6.h:195
nd_uint16_t srh_tag
Definition: ip6.h:196
nd_uint8_t srh_type
Definition: ip6.h:192
nd_uint8_t srh_last_ent
Definition: ip6.h:194
nd_ipv6 srh_segments[1]
Definition: ip6.h:197