Annotation of sys/netinet/ip6.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ip6.h,v 1.18 2006/12/09 01:12:28 itojun Exp $ */
2: /* $KAME: ip6.h,v 1.45 2003/06/05 04:46:38 keiichi 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. 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.
48: *
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.
60: *
61: * @(#)ip.h 8.1 (Berkeley) 6/10/93
62: */
63:
64: #ifndef _NETINET_IP6_H_
65: #define _NETINET_IP6_H_
66:
67: /*
68: * Definition for internet protocol version 6.
69: * RFC 2460
70: */
71:
72: struct ip6_hdr {
73: union {
74: struct ip6_hdrctl {
75: u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
76: u_int16_t ip6_un1_plen; /* payload length */
77: u_int8_t ip6_un1_nxt; /* next header */
78: u_int8_t ip6_un1_hlim; /* hop limit */
79: } ip6_un1;
80: u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
81: } ip6_ctlun;
82: struct in6_addr ip6_src; /* source address */
83: struct in6_addr ip6_dst; /* destination address */
84: } __packed;
85:
86: #define ip6_vfc ip6_ctlun.ip6_un2_vfc
87: #define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
88: #define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
89: #define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
90: #define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
91: #define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
92:
93: #define IPV6_VERSION 0x60
94: #define IPV6_VERSION_MASK 0xf0
95:
96: #if _BYTE_ORDER == _BIG_ENDIAN
97: #define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
98: #define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
99: #else
100: #if _BYTE_ORDER == _LITTLE_ENDIAN
101: #define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
102: #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
103: #endif /* _LITTLE_ENDIAN */
104: #endif
105: #if 1
106: /* ECN bits proposed by Sally Floyd */
107: #define IP6TOS_CE 0x01 /* congestion experienced */
108: #define IP6TOS_ECT 0x02 /* ECN-capable transport */
109: #endif
110:
111: #ifdef _KERNEL
112: /*
113: * for IPv6 pseudo header checksum
114: * XXX nonstandard
115: */
116: struct ip6_hdr_pseudo {
117: struct in6_addr ip6ph_src;
118: struct in6_addr ip6ph_dst;
119: u_int32_t ip6ph_len;
120: u_int8_t ip6ph_zero[3];
121: u_int8_t ip6ph_nxt;
122: } __packed;
123: #endif
124:
125: /*
126: * Extension Headers
127: */
128: struct ip6_ext {
129: u_int8_t ip6e_nxt;
130: u_int8_t ip6e_len;
131: } __packed;
132:
133: /* Hop-by-Hop options header */
134: /* XXX should we pad it to force alignment on an 8-byte boundary? */
135: struct ip6_hbh {
136: u_int8_t ip6h_nxt; /* next header */
137: u_int8_t ip6h_len; /* length in units of 8 octets */
138: /* followed by options */
139: } __packed;
140:
141: /* Destination options header */
142: /* XXX should we pad it to force alignment on an 8-byte boundary? */
143: struct ip6_dest {
144: u_int8_t ip6d_nxt; /* next header */
145: u_int8_t ip6d_len; /* length in units of 8 octets */
146: /* followed by options */
147: } __packed;
148:
149: /* Option types and related macros */
150: #define IP6OPT_PAD1 0x00 /* 00 0 00000 */
151: #define IP6OPT_PADN 0x01 /* 00 0 00001 */
152: #define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
153: #define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
154: #define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
155: #define IP6OPT_ROUTER_ALERT 0x05 /* 00 0 00101 (RFC3542, recommended) */
156:
157: #define IP6OPT_RTALERT_LEN 4
158: #define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
159: #define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
160: #define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
161: #define IP6OPT_MINLEN 2
162:
163: #define IP6OPT_TYPE(o) ((o) & 0xC0)
164: #define IP6OPT_TYPE_SKIP 0x00
165: #define IP6OPT_TYPE_DISCARD 0x40
166: #define IP6OPT_TYPE_FORCEICMP 0x80
167: #define IP6OPT_TYPE_ICMP 0xC0
168:
169: #define IP6OPT_MUTABLE 0x20
170:
171: /* IPv6 options: common part */
172: struct ip6_opt {
173: u_int8_t ip6o_type;
174: u_int8_t ip6o_len;
175: } __packed;
176:
177: /* Jumbo Payload Option */
178: struct ip6_opt_jumbo {
179: u_int8_t ip6oj_type;
180: u_int8_t ip6oj_len;
181: u_int8_t ip6oj_jumbo_len[4];
182: } __packed;
183: #define IP6OPT_JUMBO_LEN 6
184:
185: /* NSAP Address Option */
186: struct ip6_opt_nsap {
187: u_int8_t ip6on_type;
188: u_int8_t ip6on_len;
189: u_int8_t ip6on_src_nsap_len;
190: u_int8_t ip6on_dst_nsap_len;
191: /* followed by source NSAP */
192: /* followed by destination NSAP */
193: } __packed;
194:
195: /* Tunnel Limit Option */
196: struct ip6_opt_tunnel {
197: u_int8_t ip6ot_type;
198: u_int8_t ip6ot_len;
199: u_int8_t ip6ot_encap_limit;
200: } __packed;
201:
202: /* Router Alert Option */
203: struct ip6_opt_router {
204: u_int8_t ip6or_type;
205: u_int8_t ip6or_len;
206: u_int8_t ip6or_value[2];
207: } __packed;
208: /* Router alert values (in network byte order) */
209: #if _BYTE_ORDER == _BIG_ENDIAN
210: #define IP6_ALERT_MLD 0x0000
211: #define IP6_ALERT_RSVP 0x0001
212: #define IP6_ALERT_AN 0x0002
213: #else
214: #if _BYTE_ORDER == _LITTLE_ENDIAN
215: #define IP6_ALERT_MLD 0x0000
216: #define IP6_ALERT_RSVP 0x0100
217: #define IP6_ALERT_AN 0x0200
218: #endif /* _LITTLE_ENDIAN */
219: #endif
220:
221: /* Routing header */
222: struct ip6_rthdr {
223: u_int8_t ip6r_nxt; /* next header */
224: u_int8_t ip6r_len; /* length in units of 8 octets */
225: u_int8_t ip6r_type; /* routing type */
226: u_int8_t ip6r_segleft; /* segments left */
227: /* followed by routing type specific data */
228: } __packed;
229:
230: /* Type 0 Routing header */
231: struct ip6_rthdr0 {
232: u_int8_t ip6r0_nxt; /* next header */
233: u_int8_t ip6r0_len; /* length in units of 8 octets */
234: u_int8_t ip6r0_type; /* always zero */
235: u_int8_t ip6r0_segleft; /* segments left */
236: u_int32_t ip6r0_reserved; /* reserved field */
237: } __packed;
238:
239: /* Fragment header */
240: struct ip6_frag {
241: u_int8_t ip6f_nxt; /* next header */
242: u_int8_t ip6f_reserved; /* reserved field */
243: u_int16_t ip6f_offlg; /* offset, reserved, and flag */
244: u_int32_t ip6f_ident; /* identification */
245: } __packed;
246:
247: #if _BYTE_ORDER == _BIG_ENDIAN
248: #define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
249: #define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
250: #define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
251: #else /* _BYTE_ORDER == _LITTLE_ENDIAN */
252: #define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
253: #define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
254: #define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
255: #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
256:
257: /*
258: * Internet implementation parameters.
259: */
260: #define IPV6_MAXHLIM 255 /* maximum hoplimit */
261: #define IPV6_DEFHLIM 64 /* default hlim */
262: #define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
263: #define IPV6_HLIMDEC 1 /* subtracted when forwarding */
264:
265: #define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
266: #define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
267:
268: #ifdef _KERNEL
269: /*
270: * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
271: * "len") is located in single mbuf, on contiguous memory region.
272: * The pointer to the region will be returned to pointer variable "val",
273: * with type "typ".
274: * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
275: * very top of mbuf. GET0 is likely to make memory copy than GET.
276: */
277: #define IP6_EXTHDR_GET(val, typ, m, off, len) \
278: do { \
279: struct mbuf *t; \
280: int tmp; \
281: if ((m)->m_len >= (off) + (len)) \
282: (val) = (typ)(mtod((m), caddr_t) + (off)); \
283: else { \
284: t = m_pulldown((m), (off), (len), &tmp); \
285: if (t) { \
286: if (t->m_len < tmp + (len)) \
287: panic("m_pulldown malfunction"); \
288: (val) = (typ)(mtod(t, caddr_t) + tmp); \
289: } else { \
290: (val) = (typ)NULL; \
291: (m) = NULL; \
292: } \
293: } \
294: } while (0)
295:
296: #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
297: do { \
298: struct mbuf *t; \
299: if ((off) == 0 && (m)->m_len >= len) \
300: (val) = (typ)mtod((m), caddr_t); \
301: else { \
302: t = m_pulldown((m), (off), (len), NULL); \
303: if (t) { \
304: if (t->m_len < (len)) \
305: panic("m_pulldown malfunction"); \
306: (val) = (typ)mtod(t, caddr_t); \
307: } else { \
308: (val) = (typ)NULL; \
309: (m) = NULL; \
310: } \
311: } \
312: } while (0)
313: #endif /* _KERNEL */
314: #endif /* _NETINET_IP6_H_ */
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