kernel - support dummy reallocblks in devfs
[dragonfly.git] / sys / netinet / ip6.h
blob35479351af529bb4879ae019aad71d4f102e4269
1 /* $FreeBSD: src/sys/netinet/ip6.h,v 1.2.2.2 2001/07/03 11:01:46 ume Exp $ */
2 /* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $ */
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
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.
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.
34 * Copyright (c) 1982, 1986, 1993
35 * The Regents of the University of California. All rights reserved.
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.
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.
61 * @(#)ip.h 8.1 (Berkeley) 6/10/93
64 #ifndef _NETINET_IP6_H_
65 #define _NETINET_IP6_H_
67 #ifndef _SYS_TYPES_H_
68 #include <sys/types.h>
69 #endif
70 #ifndef _NETINET_IN_H_
71 #include <netinet/in.h>
72 #endif
73 #include <machine/endian.h>
77 * Definition for internet protocol version 6.
78 * RFC 2460
81 struct ip6_hdr {
82 union {
83 struct ip6_hdrctl {
84 u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
85 u_int16_t ip6_un1_plen; /* payload length */
86 u_int8_t ip6_un1_nxt; /* next header */
87 u_int8_t ip6_un1_hlim; /* hop limit */
88 } ip6_un1;
89 u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
90 } ip6_ctlun;
91 struct in6_addr ip6_src; /* source address */
92 struct in6_addr ip6_dst; /* destination address */
93 } __attribute__((__packed__));
95 #define ip6_vfc ip6_ctlun.ip6_un2_vfc
96 #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
97 #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
98 #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
99 #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
100 #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
102 #define IPV6_VERSION 0x60
103 #define IPV6_VERSION_MASK 0xf0
105 #if _BYTE_ORDER == _BIG_ENDIAN
106 #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
107 #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
108 #elif _BYTE_ORDER == _LITTLE_ENDIAN
109 #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
110 #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
111 #else
112 #error "Byte order not implemented"
113 #endif
114 #if 1
115 /* ECN bits proposed by Sally Floyd */
116 #define IP6TOS_CE 0x01 /* congestion experienced */
117 #define IP6TOS_ECT 0x02 /* ECN-capable transport */
118 #endif
121 * Extension Headers
124 struct ip6_ext {
125 u_int8_t ip6e_nxt;
126 u_int8_t ip6e_len;
127 } __attribute__((__packed__));
129 /* Hop-by-Hop options header */
130 /* XXX should we pad it to force alignment on an 8-byte boundary? */
131 struct ip6_hbh {
132 u_int8_t ip6h_nxt; /* next header */
133 u_int8_t ip6h_len; /* length in units of 8 octets */
134 /* followed by options */
135 } __attribute__((__packed__));
137 /* Destination options header */
138 /* XXX should we pad it to force alignment on an 8-byte boundary? */
139 struct ip6_dest {
140 u_int8_t ip6d_nxt; /* next header */
141 u_int8_t ip6d_len; /* length in units of 8 octets */
142 /* followed by options */
143 } __attribute__((__packed__));
145 /* Option types and related macros */
146 #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
147 #define IP6OPT_PADN 0x01 /* 00 0 00001 */
148 #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
149 #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
150 #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
151 #define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
153 #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
154 #define IP6OPT_RTALERT_LEN 4
155 #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
156 #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
157 #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
158 #define IP6OPT_MINLEN 2
160 #define IP6OPT_BINDING_UPDATE 0xc6 /* 11 0 00110 */
161 #define IP6OPT_BINDING_ACK 0x07 /* 00 0 00111 */
162 #define IP6OPT_BINDING_REQ 0x08 /* 00 0 01000 */
163 #define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
164 #define IP6OPT_EID 0x8a /* 10 0 01010 */
166 #define IP6OPT_TYPE(o) ((o) & 0xC0)
167 #define IP6OPT_TYPE_SKIP 0x00
168 #define IP6OPT_TYPE_DISCARD 0x40
169 #define IP6OPT_TYPE_FORCEICMP 0x80
170 #define IP6OPT_TYPE_ICMP 0xC0
172 #define IP6OPT_MUTABLE 0x20
174 /* Jumbo Payload Option */
175 struct ip6_opt_jumbo {
176 u_int8_t ip6oj_type;
177 u_int8_t ip6oj_len;
178 u_int8_t ip6oj_jumbo_len[4];
179 } __attribute__((__packed__));
180 #define IP6OPT_JUMBO_LEN 6
182 /* IPv6 options: common part */
183 struct ip6_opt {
184 u_int8_t ip6o_type;
185 u_int8_t ip6o_len;
186 } __attribute__((__packed__));
189 /* NSAP Address Option */
190 struct ip6_opt_nsap {
191 u_int8_t ip6on_type;
192 u_int8_t ip6on_len;
193 u_int8_t ip6on_src_nsap_len;
194 u_int8_t ip6on_dst_nsap_len;
195 /* followed by source NSAP */
196 /* followed by destination NSAP */
197 } __attribute__((__packed__));
199 /* Tunnel Limit Option */
200 struct ip6_opt_tunnel {
201 u_int8_t ip6ot_type;
202 u_int8_t ip6ot_len;
203 u_int8_t ip6ot_encap_limit;
204 } __attribute__((__packed__));
206 /* Router Alert Option */
207 struct ip6_opt_router {
208 u_int8_t ip6or_type;
209 u_int8_t ip6or_len;
210 u_int8_t ip6or_value[2];
211 } __attribute__((__packed__));
213 /* Router alert values (in network byte order) */
214 #if BYTE_ORDER == BIG_ENDIAN
215 #define IP6_ALERT_MLD 0x0000
216 #define IP6_ALERT_RSVP 0x0001
217 #define IP6_ALERT_AN 0x0002
218 #else
219 #if BYTE_ORDER == LITTLE_ENDIAN
220 #define IP6_ALERT_MLD 0x0000
221 #define IP6_ALERT_RSVP 0x0100
222 #define IP6_ALERT_AN 0x0200
223 #endif /* LITTLE_ENDIAN */
224 #endif
226 /* Routing header */
227 struct ip6_rthdr {
228 u_int8_t ip6r_nxt; /* next header */
229 u_int8_t ip6r_len; /* length in units of 8 octets */
230 u_int8_t ip6r_type; /* routing type */
231 u_int8_t ip6r_segleft; /* segments left */
232 /* followed by routing type specific data */
233 } __attribute__((__packed__));
235 /* Fragment header */
236 struct ip6_frag {
237 u_int8_t ip6f_nxt; /* next header */
238 u_int8_t ip6f_reserved; /* reserved field */
239 u_int16_t ip6f_offlg; /* offset, reserved, and flag */
240 u_int32_t ip6f_ident; /* identification */
241 } __attribute__((__packed__));
243 #if _BYTE_ORDER == _BIG_ENDIAN
244 #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
245 #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
246 #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
247 #elif _BYTE_ORDER == _LITTLE_ENDIAN
248 #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
249 #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
250 #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
251 #else
252 #error "Byte order not implemented"
253 #endif
256 * Internet implementation parameters.
258 #define IPV6_MAXHLIM 255 /* maximun hoplimit */
259 #define IPV6_DEFHLIM 64 /* default hlim */
260 #define IPV6_MINHLIM 40 /* minimum hop limit */
261 #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
262 #define IPV6_HLIMDEC 1 /* subtracted when forwaeding */
264 #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
265 #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
267 #ifdef _KERNEL
269 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
270 * target header (including IPv6 itself, extension headers and
271 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
272 * to store incoming data into one internal mbuf or one or more external
273 * mbufs(never into two or more internal mbufs). Thus, the third case is
274 * supposed to never be matched but is prepared just in case.
277 #define IP6_EXTHDR_CHECK(m, off, hlen, ret) \
278 do { \
279 if ((m)->m_next != NULL) { \
280 if (((m)->m_flags & M_LOOP) && \
281 ((m)->m_len < (off) + (hlen)) && \
282 (((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
283 ip6stat.ip6s_exthdrtoolong++; \
284 return ret; \
285 } else if ((m)->m_flags & M_EXT) { \
286 if ((m)->m_len < (off) + (hlen)) { \
287 ip6stat.ip6s_exthdrtoolong++; \
288 m_freem(m); \
289 return ret; \
291 } else { \
292 if ((m)->m_len < (off) + (hlen)) { \
293 ip6stat.ip6s_exthdrtoolong++; \
294 m_freem(m); \
295 return ret; \
298 } else { \
299 if ((m)->m_len < (off) + (hlen)) { \
300 ip6stat.ip6s_tooshort++; \
301 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
302 m_freem(m); \
303 return ret; \
306 } while (0)
308 #define IP6_EXTHDR_CHECK_VOIDRET(m, off, hlen) \
309 IP6_EXTHDR_CHECK(m, off, hlen, )
312 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
313 * "len") is located in single mbuf, on contiguous memory region.
314 * The pointer to the region will be returned to pointer variable "val",
315 * with type "typ".
316 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
317 * very top of mbuf. GET0 is likely to make memory copy than GET.
319 * XXX we're now testing this, needs m_pulldown()
321 #define IP6_EXTHDR_GET(val, typ, m, off, len) \
322 do { \
323 struct mbuf *t; \
324 int tmp; \
325 if ((m)->m_len >= (off) + (len)) \
326 (val) = (typ)(mtod((m), caddr_t) + (off)); \
327 else { \
328 t = m_pulldown((m), (off), (len), &tmp); \
329 if (t) { \
330 if (t->m_len < tmp + (len)) \
331 panic("m_pulldown malfunction"); \
332 (val) = (typ)(mtod(t, caddr_t) + tmp); \
333 } else { \
334 (val) = NULL; \
335 (m) = NULL; \
338 } while (0)
340 #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
341 do { \
342 struct mbuf *t; \
343 if ((off) == 0) \
344 (val) = (typ)mtod(m, caddr_t); \
345 else { \
346 t = m_pulldown((m), (off), (len), NULL); \
347 if (t) { \
348 if (t->m_len < (len)) \
349 panic("m_pulldown malfunction"); \
350 (val) = (typ)mtod(t, caddr_t); \
351 } else { \
352 (val) = NULL; \
353 (m) = NULL; \
356 } while (0)
357 #endif /*_KERNEL*/
359 #endif /* not _NETINET_IP6_H_ */