1 /* $FreeBSD: src/sys/netinet/ip6.h,v 1.2.2.2 2001/07/03 11:01:46 ume Exp $ */
2 /* $DragonFly: src/sys/netinet/ip6.h,v 1.2 2003/06/17 04:28:51 dillon Exp $ */
3 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
35 * Copyright (c) 1982, 1986, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
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.
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
66 * @(#)ip.h 8.1 (Berkeley) 6/10/93
69 #ifndef _NETINET_IP6_H_
70 #define _NETINET_IP6_H_
73 * Definition for internet protocol version 6.
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 */
85 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
87 struct in6_addr ip6_src; /* source address */
88 struct in6_addr ip6_dst; /* destination address */
89 } __attribute__((__packed__));
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
98 #define IPV6_VERSION 0x60
99 #define IPV6_VERSION_MASK 0xf0
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) */
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 */
111 /* ECN bits proposed by Sally Floyd */
112 #define IP6TOS_CE 0x01 /* congestion experienced */
113 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
123 } __attribute__((__packed__));
125 /* Hop-by-Hop options header */
126 /* XXX should we pad it to force alignment on an 8-byte boundary? */
128 u_int8_t ip6h_nxt; /* next header */
129 u_int8_t ip6h_len; /* length in units of 8 octets */
130 /* followed by options */
131 } __attribute__((__packed__));
133 /* Destination options header */
134 /* XXX should we pad it to force alignment on an 8-byte boundary? */
136 u_int8_t ip6d_nxt; /* next header */
137 u_int8_t ip6d_len; /* length in units of 8 octets */
138 /* followed by options */
139 } __attribute__((__packed__));
141 /* Option types and related macros */
142 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
143 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
144 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
145 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
146 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
147 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
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
155 #define IP6OPT_BINDING_UPDATE 0xc6 /* 11 0 00110 */
156 #define IP6OPT_BINDING_ACK 0x07 /* 00 0 00111 */
157 #define IP6OPT_BINDING_REQ 0x08 /* 00 0 01000 */
158 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
159 #define IP6OPT_EID 0x8a /* 10 0 01010 */
161 #define IP6OPT_TYPE(o) ((o) & 0xC0)
162 #define IP6OPT_TYPE_SKIP 0x00
163 #define IP6OPT_TYPE_DISCARD 0x40
164 #define IP6OPT_TYPE_FORCEICMP 0x80
165 #define IP6OPT_TYPE_ICMP 0xC0
167 #define IP6OPT_MUTABLE 0x20
169 #define IP6OPT_JUMBO_LEN 6
173 u_int8_t ip6r_nxt; /* next header */
174 u_int8_t ip6r_len; /* length in units of 8 octets */
175 u_int8_t ip6r_type; /* routing type */
176 u_int8_t ip6r_segleft; /* segments left */
177 /* followed by routing type specific data */
178 } __attribute__((__packed__));
180 /* Type 0 Routing header */
182 u_int8_t ip6r0_nxt; /* next header */
183 u_int8_t ip6r0_len; /* length in units of 8 octets */
184 u_int8_t ip6r0_type; /* always zero */
185 u_int8_t ip6r0_segleft; /* segments left */
186 u_int8_t ip6r0_reserved; /* reserved field */
187 u_int8_t ip6r0_slmap[3]; /* strict/loose bit map */
188 struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */
189 } __attribute__((__packed__));
191 /* Fragment header */
193 u_int8_t ip6f_nxt; /* next header */
194 u_int8_t ip6f_reserved; /* reserved field */
195 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
196 u_int32_t ip6f_ident; /* identification */
197 } __attribute__((__packed__));
199 #if BYTE_ORDER == BIG_ENDIAN
200 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
201 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
202 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
203 #else /* BYTE_ORDER == LITTLE_ENDIAN */
204 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
205 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
206 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
207 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
210 * Internet implementation parameters.
212 #define IPV6_MAXHLIM 255 /* maximun hoplimit */
213 #define IPV6_DEFHLIM 64 /* default hlim */
214 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
215 #define IPV6_HLIMDEC 1 /* subtracted when forwaeding */
217 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
218 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
222 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
223 * target header (including IPv6 itself, extension headers and
224 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
225 * to store incoming data into one internal mbuf or one or more external
226 * mbufs(never into two or more internal mbufs). Thus, the third case is
227 * supposed to never be matched but is prepared just in case.
230 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \
232 if ((m)->m_next != NULL) { \
233 if (((m)->m_flags & M_LOOP) && \
234 ((m)->m_len < (off) + (hlen)) && \
235 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
236 ip6stat.ip6s_exthdrtoolong++; \
238 } else if ((m)->m_flags & M_EXT) { \
239 if ((m)->m_len < (off) + (hlen)) { \
240 ip6stat.ip6s_exthdrtoolong++; \
245 if ((m)->m_len < (off) + (hlen)) { \
246 ip6stat.ip6s_exthdrtoolong++; \
252 if ((m)->m_len < (off) + (hlen)) { \
253 ip6stat.ip6s_tooshort++; \
254 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
262 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
263 * "len") is located in single mbuf, on contiguous memory region.
264 * The pointer to the region will be returned to pointer variable "val",
266 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
267 * very top of mbuf. GET0 is likely to make memory copy than GET.
269 * XXX we're now testing this, needs m_pulldown()
271 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
275 if ((m)->m_len >= (off) + (len)) \
276 (val) = (typ)(mtod((m), caddr_t) + (off)); \
278 t = m_pulldown((m), (off), (len), &tmp); \
280 if (t->m_len < tmp + (len)) \
281 panic("m_pulldown malfunction"); \
282 (val) = (typ)(mtod(t, caddr_t) + tmp); \
290 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
294 (val) = (typ)mtod(m, caddr_t); \
296 t = m_pulldown((m), (off), (len), NULL); \
298 if (t->m_len < (len)) \
299 panic("m_pulldown malfunction"); \
300 (val) = (typ)mtod(t, caddr_t); \
309 #endif /* not _NETINET_IP6_H_ */