xref: /freebsd/sys/netinet/ip6.h (revision fbbd9655e5107c68e4e0146ff22b73d7350475bc)
1686cdd19SJun-ichiro itojun Hagino /*	$FreeBSD$	*/
233841545SHajimu UMEMOTO /*	$KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $	*/
3686cdd19SJun-ichiro itojun Hagino 
4c398230bSWarner Losh /*-
5686cdd19SJun-ichiro itojun Hagino  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
682cd038dSYoshinobu Inoue  * All rights reserved.
782cd038dSYoshinobu Inoue  *
882cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
982cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
1082cd038dSYoshinobu Inoue  * are met:
1182cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
1282cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
1382cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
1482cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
1582cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
1682cd038dSYoshinobu Inoue  * 3. Neither the name of the project nor the names of its contributors
1782cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
1882cd038dSYoshinobu Inoue  *    without specific prior written permission.
1982cd038dSYoshinobu Inoue  *
2082cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
2182cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2282cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2382cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
2482cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2582cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2682cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2782cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2882cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2982cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3082cd038dSYoshinobu Inoue  * SUCH DAMAGE.
3182cd038dSYoshinobu Inoue  */
3282cd038dSYoshinobu Inoue 
33c398230bSWarner Losh /*-
34686cdd19SJun-ichiro itojun Hagino  * Copyright (c) 1982, 1986, 1993
35686cdd19SJun-ichiro itojun Hagino  *	The Regents of the University of California.  All rights reserved.
36686cdd19SJun-ichiro itojun Hagino  *
37686cdd19SJun-ichiro itojun Hagino  * Redistribution and use in source and binary forms, with or without
38686cdd19SJun-ichiro itojun Hagino  * modification, are permitted provided that the following conditions
39686cdd19SJun-ichiro itojun Hagino  * are met:
40686cdd19SJun-ichiro itojun Hagino  * 1. Redistributions of source code must retain the above copyright
41686cdd19SJun-ichiro itojun Hagino  *    notice, this list of conditions and the following disclaimer.
42686cdd19SJun-ichiro itojun Hagino  * 2. Redistributions in binary form must reproduce the above copyright
43686cdd19SJun-ichiro itojun Hagino  *    notice, this list of conditions and the following disclaimer in the
44686cdd19SJun-ichiro itojun Hagino  *    documentation and/or other materials provided with the distribution.
45*fbbd9655SWarner Losh  * 3. Neither the name of the University nor the names of its contributors
46686cdd19SJun-ichiro itojun Hagino  *    may be used to endorse or promote products derived from this software
47686cdd19SJun-ichiro itojun Hagino  *    without specific prior written permission.
48686cdd19SJun-ichiro itojun Hagino  *
49686cdd19SJun-ichiro itojun Hagino  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50686cdd19SJun-ichiro itojun Hagino  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51686cdd19SJun-ichiro itojun Hagino  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52686cdd19SJun-ichiro itojun Hagino  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53686cdd19SJun-ichiro itojun Hagino  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54686cdd19SJun-ichiro itojun Hagino  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55686cdd19SJun-ichiro itojun Hagino  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56686cdd19SJun-ichiro itojun Hagino  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57686cdd19SJun-ichiro itojun Hagino  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58686cdd19SJun-ichiro itojun Hagino  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59686cdd19SJun-ichiro itojun Hagino  * SUCH DAMAGE.
60686cdd19SJun-ichiro itojun Hagino  *
61686cdd19SJun-ichiro itojun Hagino  *	@(#)ip.h	8.1 (Berkeley) 6/10/93
62686cdd19SJun-ichiro itojun Hagino  */
63686cdd19SJun-ichiro itojun Hagino 
64686cdd19SJun-ichiro itojun Hagino #ifndef _NETINET_IP6_H_
65686cdd19SJun-ichiro itojun Hagino #define _NETINET_IP6_H_
66686cdd19SJun-ichiro itojun Hagino 
67686cdd19SJun-ichiro itojun Hagino /*
68686cdd19SJun-ichiro itojun Hagino  * Definition for internet protocol version 6.
69686cdd19SJun-ichiro itojun Hagino  * RFC 2460
70686cdd19SJun-ichiro itojun Hagino  */
71686cdd19SJun-ichiro itojun Hagino 
72686cdd19SJun-ichiro itojun Hagino struct ip6_hdr {
73686cdd19SJun-ichiro itojun Hagino 	union {
74686cdd19SJun-ichiro itojun Hagino 		struct ip6_hdrctl {
75686cdd19SJun-ichiro itojun Hagino 			u_int32_t ip6_un1_flow;	/* 20 bits of flow-ID */
76686cdd19SJun-ichiro itojun Hagino 			u_int16_t ip6_un1_plen;	/* payload length */
77686cdd19SJun-ichiro itojun Hagino 			u_int8_t  ip6_un1_nxt;	/* next header */
78686cdd19SJun-ichiro itojun Hagino 			u_int8_t  ip6_un1_hlim;	/* hop limit */
79686cdd19SJun-ichiro itojun Hagino 		} ip6_un1;
80686cdd19SJun-ichiro itojun Hagino 		u_int8_t ip6_un2_vfc;	/* 4 bits version, top 4 bits class */
81686cdd19SJun-ichiro itojun Hagino 	} ip6_ctlun;
82686cdd19SJun-ichiro itojun Hagino 	struct in6_addr ip6_src;	/* source address */
83686cdd19SJun-ichiro itojun Hagino 	struct in6_addr ip6_dst;	/* destination address */
84618d51bbSHajimu UMEMOTO } __packed;
85686cdd19SJun-ichiro itojun Hagino 
86686cdd19SJun-ichiro itojun Hagino #define ip6_vfc		ip6_ctlun.ip6_un2_vfc
87686cdd19SJun-ichiro itojun Hagino #define ip6_flow	ip6_ctlun.ip6_un1.ip6_un1_flow
88686cdd19SJun-ichiro itojun Hagino #define ip6_plen	ip6_ctlun.ip6_un1.ip6_un1_plen
89686cdd19SJun-ichiro itojun Hagino #define ip6_nxt		ip6_ctlun.ip6_un1.ip6_un1_nxt
90686cdd19SJun-ichiro itojun Hagino #define ip6_hlim	ip6_ctlun.ip6_un1.ip6_un1_hlim
91686cdd19SJun-ichiro itojun Hagino #define ip6_hops	ip6_ctlun.ip6_un1.ip6_un1_hlim
92686cdd19SJun-ichiro itojun Hagino 
93686cdd19SJun-ichiro itojun Hagino #define IPV6_VERSION		0x60
94686cdd19SJun-ichiro itojun Hagino #define IPV6_VERSION_MASK	0xf0
95686cdd19SJun-ichiro itojun Hagino 
96686cdd19SJun-ichiro itojun Hagino #if BYTE_ORDER == BIG_ENDIAN
97686cdd19SJun-ichiro itojun Hagino #define IPV6_FLOWINFO_MASK	0x0fffffff	/* flow info (28 bits) */
98686cdd19SJun-ichiro itojun Hagino #define IPV6_FLOWLABEL_MASK	0x000fffff	/* flow label (20 bits) */
99686cdd19SJun-ichiro itojun Hagino #else
100686cdd19SJun-ichiro itojun Hagino #if BYTE_ORDER == LITTLE_ENDIAN
101686cdd19SJun-ichiro itojun Hagino #define IPV6_FLOWINFO_MASK	0xffffff0f	/* flow info (28 bits) */
102686cdd19SJun-ichiro itojun Hagino #define IPV6_FLOWLABEL_MASK	0xffff0f00	/* flow label (20 bits) */
103686cdd19SJun-ichiro itojun Hagino #endif /* LITTLE_ENDIAN */
104686cdd19SJun-ichiro itojun Hagino #endif
10533841545SHajimu UMEMOTO #if 1
106686cdd19SJun-ichiro itojun Hagino /* ECN bits proposed by Sally Floyd */
107686cdd19SJun-ichiro itojun Hagino #define IP6TOS_CE		0x01	/* congestion experienced */
108686cdd19SJun-ichiro itojun Hagino #define IP6TOS_ECT		0x02	/* ECN-capable transport */
10933841545SHajimu UMEMOTO #endif
110686cdd19SJun-ichiro itojun Hagino 
111686cdd19SJun-ichiro itojun Hagino /*
112686cdd19SJun-ichiro itojun Hagino  * Extension Headers
113686cdd19SJun-ichiro itojun Hagino  */
114686cdd19SJun-ichiro itojun Hagino 
115686cdd19SJun-ichiro itojun Hagino struct	ip6_ext {
11633841545SHajimu UMEMOTO 	u_int8_t ip6e_nxt;
11733841545SHajimu UMEMOTO 	u_int8_t ip6e_len;
118618d51bbSHajimu UMEMOTO } __packed;
119686cdd19SJun-ichiro itojun Hagino 
120686cdd19SJun-ichiro itojun Hagino /* Hop-by-Hop options header */
121686cdd19SJun-ichiro itojun Hagino /* XXX should we pad it to force alignment on an 8-byte boundary? */
122686cdd19SJun-ichiro itojun Hagino struct ip6_hbh {
123686cdd19SJun-ichiro itojun Hagino 	u_int8_t ip6h_nxt;	/* next header */
124686cdd19SJun-ichiro itojun Hagino 	u_int8_t ip6h_len;	/* length in units of 8 octets */
125686cdd19SJun-ichiro itojun Hagino 	/* followed by options */
126618d51bbSHajimu UMEMOTO } __packed;
127686cdd19SJun-ichiro itojun Hagino 
128686cdd19SJun-ichiro itojun Hagino /* Destination options header */
129686cdd19SJun-ichiro itojun Hagino /* XXX should we pad it to force alignment on an 8-byte boundary? */
130686cdd19SJun-ichiro itojun Hagino struct ip6_dest {
131686cdd19SJun-ichiro itojun Hagino 	u_int8_t ip6d_nxt;	/* next header */
132686cdd19SJun-ichiro itojun Hagino 	u_int8_t ip6d_len;	/* length in units of 8 octets */
133686cdd19SJun-ichiro itojun Hagino 	/* followed by options */
134618d51bbSHajimu UMEMOTO } __packed;
135686cdd19SJun-ichiro itojun Hagino 
136686cdd19SJun-ichiro itojun Hagino /* Option types and related macros */
137686cdd19SJun-ichiro itojun Hagino #define IP6OPT_PAD1		0x00	/* 00 0 00000 */
138686cdd19SJun-ichiro itojun Hagino #define IP6OPT_PADN		0x01	/* 00 0 00001 */
139686cdd19SJun-ichiro itojun Hagino #define IP6OPT_JUMBO		0xC2	/* 11 0 00010 = 194 */
14033841545SHajimu UMEMOTO #define IP6OPT_NSAP_ADDR	0xC3	/* 11 0 00011 */
14133841545SHajimu UMEMOTO #define IP6OPT_TUNNEL_LIMIT	0x04	/* 00 0 00100 */
142f95d4633SHajimu UMEMOTO #ifndef _KERNEL
14333841545SHajimu UMEMOTO #define IP6OPT_RTALERT		0x05	/* 00 0 00101 (KAME definition) */
144f95d4633SHajimu UMEMOTO #endif
14518b35df8SHajimu UMEMOTO #define IP6OPT_ROUTER_ALERT	0x05	/* 00 0 00101 (RFC3542, recommended) */
14633841545SHajimu UMEMOTO 
147686cdd19SJun-ichiro itojun Hagino #define IP6OPT_RTALERT_LEN	4
148686cdd19SJun-ichiro itojun Hagino #define IP6OPT_RTALERT_MLD	0	/* Datagram contains an MLD message */
149686cdd19SJun-ichiro itojun Hagino #define IP6OPT_RTALERT_RSVP	1	/* Datagram contains an RSVP message */
150686cdd19SJun-ichiro itojun Hagino #define IP6OPT_RTALERT_ACTNET	2 	/* contains an Active Networks msg */
151686cdd19SJun-ichiro itojun Hagino #define IP6OPT_MINLEN		2
152686cdd19SJun-ichiro itojun Hagino 
15333841545SHajimu UMEMOTO #define IP6OPT_EID		0x8a	/* 10 0 01010 */
15433841545SHajimu UMEMOTO 
155686cdd19SJun-ichiro itojun Hagino #define IP6OPT_TYPE(o)		((o) & 0xC0)
156686cdd19SJun-ichiro itojun Hagino #define IP6OPT_TYPE_SKIP	0x00
157686cdd19SJun-ichiro itojun Hagino #define IP6OPT_TYPE_DISCARD	0x40
158686cdd19SJun-ichiro itojun Hagino #define IP6OPT_TYPE_FORCEICMP	0x80
159686cdd19SJun-ichiro itojun Hagino #define IP6OPT_TYPE_ICMP	0xC0
160686cdd19SJun-ichiro itojun Hagino 
161686cdd19SJun-ichiro itojun Hagino #define IP6OPT_MUTABLE		0x20
162686cdd19SJun-ichiro itojun Hagino 
1636c4eaa87SHajimu UMEMOTO /* IPv6 options: common part */
1646c4eaa87SHajimu UMEMOTO struct ip6_opt {
1656c4eaa87SHajimu UMEMOTO 	u_int8_t ip6o_type;
1666c4eaa87SHajimu UMEMOTO 	u_int8_t ip6o_len;
1676c4eaa87SHajimu UMEMOTO } __packed;
1686c4eaa87SHajimu UMEMOTO 
1696c4eaa87SHajimu UMEMOTO /* Jumbo Payload Option */
1706c4eaa87SHajimu UMEMOTO struct ip6_opt_jumbo {
1716c4eaa87SHajimu UMEMOTO 	u_int8_t ip6oj_type;
1726c4eaa87SHajimu UMEMOTO 	u_int8_t ip6oj_len;
1736c4eaa87SHajimu UMEMOTO 	u_int8_t ip6oj_jumbo_len[4];
1746c4eaa87SHajimu UMEMOTO } __packed;
17533841545SHajimu UMEMOTO #define IP6OPT_JUMBO_LEN	6
17633841545SHajimu UMEMOTO 
1776c4eaa87SHajimu UMEMOTO /* NSAP Address Option */
1786c4eaa87SHajimu UMEMOTO struct ip6_opt_nsap {
1796c4eaa87SHajimu UMEMOTO 	u_int8_t ip6on_type;
1806c4eaa87SHajimu UMEMOTO 	u_int8_t ip6on_len;
1816c4eaa87SHajimu UMEMOTO 	u_int8_t ip6on_src_nsap_len;
1826c4eaa87SHajimu UMEMOTO 	u_int8_t ip6on_dst_nsap_len;
1836c4eaa87SHajimu UMEMOTO 	/* followed by source NSAP */
1846c4eaa87SHajimu UMEMOTO 	/* followed by destination NSAP */
1856c4eaa87SHajimu UMEMOTO } __packed;
1866c4eaa87SHajimu UMEMOTO 
1876c4eaa87SHajimu UMEMOTO /* Tunnel Limit Option */
1886c4eaa87SHajimu UMEMOTO struct ip6_opt_tunnel {
1896c4eaa87SHajimu UMEMOTO 	u_int8_t ip6ot_type;
1906c4eaa87SHajimu UMEMOTO 	u_int8_t ip6ot_len;
1916c4eaa87SHajimu UMEMOTO 	u_int8_t ip6ot_encap_limit;
1926c4eaa87SHajimu UMEMOTO } __packed;
1936c4eaa87SHajimu UMEMOTO 
1946c4eaa87SHajimu UMEMOTO /* Router Alert Option */
1956c4eaa87SHajimu UMEMOTO struct ip6_opt_router {
1966c4eaa87SHajimu UMEMOTO 	u_int8_t ip6or_type;
1976c4eaa87SHajimu UMEMOTO 	u_int8_t ip6or_len;
1986c4eaa87SHajimu UMEMOTO 	u_int8_t ip6or_value[2];
1996c4eaa87SHajimu UMEMOTO } __packed;
2006c4eaa87SHajimu UMEMOTO /* Router alert values (in network byte order) */
2016c4eaa87SHajimu UMEMOTO #if BYTE_ORDER == BIG_ENDIAN
2026c4eaa87SHajimu UMEMOTO #define IP6_ALERT_MLD	0x0000
2036c4eaa87SHajimu UMEMOTO #define IP6_ALERT_RSVP	0x0001
2046c4eaa87SHajimu UMEMOTO #define IP6_ALERT_AN	0x0002
2056c4eaa87SHajimu UMEMOTO #else
2066c4eaa87SHajimu UMEMOTO #if BYTE_ORDER == LITTLE_ENDIAN
2076c4eaa87SHajimu UMEMOTO #define IP6_ALERT_MLD	0x0000
2086c4eaa87SHajimu UMEMOTO #define IP6_ALERT_RSVP	0x0100
2096c4eaa87SHajimu UMEMOTO #define IP6_ALERT_AN	0x0200
2106c4eaa87SHajimu UMEMOTO #endif /* LITTLE_ENDIAN */
2116c4eaa87SHajimu UMEMOTO #endif
2126c4eaa87SHajimu UMEMOTO 
213686cdd19SJun-ichiro itojun Hagino /* Routing header */
214686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr {
215686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r_nxt;	/* next header */
216686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r_len;	/* length in units of 8 octets */
217686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r_type;	/* routing type */
218686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r_segleft;	/* segments left */
219686cdd19SJun-ichiro itojun Hagino 	/* followed by routing type specific data */
220618d51bbSHajimu UMEMOTO } __packed;
221686cdd19SJun-ichiro itojun Hagino 
2221263305fSBjoern A. Zeeb /* Type 0 Routing header, deprecated by RFC 5095. */
223686cdd19SJun-ichiro itojun Hagino struct ip6_rthdr0 {
224686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r0_nxt;		/* next header */
225686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r0_len;		/* length in units of 8 octets */
226686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r0_type;		/* always zero */
227686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6r0_segleft;	/* segments left */
228c302f5bcSHajimu UMEMOTO 	u_int32_t  ip6r0_reserved;	/* reserved field */
229c302f5bcSHajimu UMEMOTO 	/* followed by up to 127 struct in6_addr */
230618d51bbSHajimu UMEMOTO } __packed;
231686cdd19SJun-ichiro itojun Hagino 
232686cdd19SJun-ichiro itojun Hagino /* Fragment header */
233686cdd19SJun-ichiro itojun Hagino struct ip6_frag {
234686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6f_nxt;		/* next header */
235686cdd19SJun-ichiro itojun Hagino 	u_int8_t  ip6f_reserved;	/* reserved field */
236686cdd19SJun-ichiro itojun Hagino 	u_int16_t ip6f_offlg;		/* offset, reserved, and flag */
237686cdd19SJun-ichiro itojun Hagino 	u_int32_t ip6f_ident;		/* identification */
238618d51bbSHajimu UMEMOTO } __packed;
239686cdd19SJun-ichiro itojun Hagino 
240686cdd19SJun-ichiro itojun Hagino #if BYTE_ORDER == BIG_ENDIAN
241686cdd19SJun-ichiro itojun Hagino #define IP6F_OFF_MASK		0xfff8	/* mask out offset from _offlg */
242686cdd19SJun-ichiro itojun Hagino #define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
243686cdd19SJun-ichiro itojun Hagino #define IP6F_MORE_FRAG		0x0001	/* more-fragments flag */
244686cdd19SJun-ichiro itojun Hagino #else /* BYTE_ORDER == LITTLE_ENDIAN */
245686cdd19SJun-ichiro itojun Hagino #define IP6F_OFF_MASK		0xf8ff	/* mask out offset from _offlg */
246686cdd19SJun-ichiro itojun Hagino #define IP6F_RESERVED_MASK	0x0600	/* reserved bits in ip6f_offlg */
247686cdd19SJun-ichiro itojun Hagino #define IP6F_MORE_FRAG		0x0100	/* more-fragments flag */
248686cdd19SJun-ichiro itojun Hagino #endif /* BYTE_ORDER == LITTLE_ENDIAN */
249686cdd19SJun-ichiro itojun Hagino 
250686cdd19SJun-ichiro itojun Hagino /*
251686cdd19SJun-ichiro itojun Hagino  * Internet implementation parameters.
252686cdd19SJun-ichiro itojun Hagino  */
25318b35df8SHajimu UMEMOTO #define IPV6_MAXHLIM	255	/* maximum hoplimit */
254686cdd19SJun-ichiro itojun Hagino #define IPV6_DEFHLIM	64	/* default hlim */
255686cdd19SJun-ichiro itojun Hagino #define IPV6_FRAGTTL	120	/* ttl for fragment packets, in slowtimo tick */
25618b35df8SHajimu UMEMOTO #define IPV6_HLIMDEC	1	/* subtracted when forwarding */
257686cdd19SJun-ichiro itojun Hagino 
258686cdd19SJun-ichiro itojun Hagino #define IPV6_MMTU	1280	/* minimal MTU and reassembly. 1024 + 256 */
259686cdd19SJun-ichiro itojun Hagino #define IPV6_MAXPACKET	65535	/* ip6 max packet size without Jumbo payload*/
260a5d1aae3SHajimu UMEMOTO #define IPV6_MAXOPTHDR	2048	/* max option header size, 256 64-bit words */
261686cdd19SJun-ichiro itojun Hagino 
262686cdd19SJun-ichiro itojun Hagino #ifdef _KERNEL
263686cdd19SJun-ichiro itojun Hagino /*
264686cdd19SJun-ichiro itojun Hagino  * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
265686cdd19SJun-ichiro itojun Hagino  * target header (including IPv6 itself, extension headers and
2666d79f3f6SRebecca Cran  * TCP/UDP/ICMP6 headers) are contiguous. KAME requires drivers
267686cdd19SJun-ichiro itojun Hagino  * to store incoming data into one internal mbuf or one or more external
268686cdd19SJun-ichiro itojun Hagino  * mbufs(never into two or more internal mbufs). Thus, the third case is
269686cdd19SJun-ichiro itojun Hagino  * supposed to never be matched but is prepared just in case.
270686cdd19SJun-ichiro itojun Hagino  */
271686cdd19SJun-ichiro itojun Hagino 
272686cdd19SJun-ichiro itojun Hagino #define IP6_EXTHDR_CHECK(m, off, hlen, ret)				\
273686cdd19SJun-ichiro itojun Hagino do {									\
274686cdd19SJun-ichiro itojun Hagino     if ((m)->m_next != NULL) {						\
275686cdd19SJun-ichiro itojun Hagino 	if (((m)->m_flags & M_LOOP) &&					\
276686cdd19SJun-ichiro itojun Hagino 	    ((m)->m_len < (off) + (hlen)) &&				\
277686cdd19SJun-ichiro itojun Hagino 	    (((m) = m_pullup((m), (off) + (hlen))) == NULL)) {		\
2789cb8d207SAndrey V. Elsukov 		IP6STAT_INC(ip6s_exthdrtoolong);				\
279686cdd19SJun-ichiro itojun Hagino 		return ret;						\
280686cdd19SJun-ichiro itojun Hagino 	} else {							\
281686cdd19SJun-ichiro itojun Hagino 		if ((m)->m_len < (off) + (hlen)) {			\
2829cb8d207SAndrey V. Elsukov 			IP6STAT_INC(ip6s_exthdrtoolong);			\
283686cdd19SJun-ichiro itojun Hagino 			m_freem(m);					\
284686cdd19SJun-ichiro itojun Hagino 			return ret;					\
285686cdd19SJun-ichiro itojun Hagino 		}							\
286686cdd19SJun-ichiro itojun Hagino 	}								\
287686cdd19SJun-ichiro itojun Hagino     } else {								\
288686cdd19SJun-ichiro itojun Hagino 	if ((m)->m_len < (off) + (hlen)) {				\
2899cb8d207SAndrey V. Elsukov 		IP6STAT_INC(ip6s_tooshort);				\
290686cdd19SJun-ichiro itojun Hagino 		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);	\
291686cdd19SJun-ichiro itojun Hagino 		m_freem(m);						\
292686cdd19SJun-ichiro itojun Hagino 		return ret;						\
293686cdd19SJun-ichiro itojun Hagino 	}								\
294686cdd19SJun-ichiro itojun Hagino     }									\
2955c6ebad8SHajimu UMEMOTO } while (/*CONSTCOND*/ 0)
296686cdd19SJun-ichiro itojun Hagino 
297686cdd19SJun-ichiro itojun Hagino /*
298686cdd19SJun-ichiro itojun Hagino  * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
299686cdd19SJun-ichiro itojun Hagino  * "len") is located in single mbuf, on contiguous memory region.
300686cdd19SJun-ichiro itojun Hagino  * The pointer to the region will be returned to pointer variable "val",
301686cdd19SJun-ichiro itojun Hagino  * with type "typ".
302686cdd19SJun-ichiro itojun Hagino  * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
303686cdd19SJun-ichiro itojun Hagino  * very top of mbuf.  GET0 is likely to make memory copy than GET.
304686cdd19SJun-ichiro itojun Hagino  *
305686cdd19SJun-ichiro itojun Hagino  * XXX we're now testing this, needs m_pulldown()
306686cdd19SJun-ichiro itojun Hagino  */
307686cdd19SJun-ichiro itojun Hagino #define IP6_EXTHDR_GET(val, typ, m, off, len) \
308686cdd19SJun-ichiro itojun Hagino do {									\
309686cdd19SJun-ichiro itojun Hagino 	struct mbuf *t;							\
310686cdd19SJun-ichiro itojun Hagino 	int tmp;							\
311686cdd19SJun-ichiro itojun Hagino 	if ((m)->m_len >= (off) + (len))				\
312686cdd19SJun-ichiro itojun Hagino 		(val) = (typ)(mtod((m), caddr_t) + (off));		\
313686cdd19SJun-ichiro itojun Hagino 	else {								\
314686cdd19SJun-ichiro itojun Hagino 		t = m_pulldown((m), (off), (len), &tmp);		\
315686cdd19SJun-ichiro itojun Hagino 		if (t) {						\
316686cdd19SJun-ichiro itojun Hagino 			if (t->m_len < tmp + (len))			\
317686cdd19SJun-ichiro itojun Hagino 				panic("m_pulldown malfunction");	\
318686cdd19SJun-ichiro itojun Hagino 			(val) = (typ)(mtod(t, caddr_t) + tmp);		\
319686cdd19SJun-ichiro itojun Hagino 		} else {						\
320686cdd19SJun-ichiro itojun Hagino 			(val) = (typ)NULL;				\
321686cdd19SJun-ichiro itojun Hagino 			(m) = NULL;					\
322686cdd19SJun-ichiro itojun Hagino 		}							\
323686cdd19SJun-ichiro itojun Hagino 	}								\
3245c6ebad8SHajimu UMEMOTO } while (/*CONSTCOND*/ 0)
325686cdd19SJun-ichiro itojun Hagino 
326686cdd19SJun-ichiro itojun Hagino #define IP6_EXTHDR_GET0(val, typ, m, off, len) \
327686cdd19SJun-ichiro itojun Hagino do {									\
328686cdd19SJun-ichiro itojun Hagino 	struct mbuf *t;							\
329686cdd19SJun-ichiro itojun Hagino 	if ((off) == 0)							\
330686cdd19SJun-ichiro itojun Hagino 		(val) = (typ)mtod(m, caddr_t);				\
331686cdd19SJun-ichiro itojun Hagino 	else {								\
332686cdd19SJun-ichiro itojun Hagino 		t = m_pulldown((m), (off), (len), NULL);		\
333686cdd19SJun-ichiro itojun Hagino 		if (t) {						\
334686cdd19SJun-ichiro itojun Hagino 			if (t->m_len < (len))				\
335686cdd19SJun-ichiro itojun Hagino 				panic("m_pulldown malfunction");	\
336686cdd19SJun-ichiro itojun Hagino 			(val) = (typ)mtod(t, caddr_t);			\
337686cdd19SJun-ichiro itojun Hagino 		} else {						\
338686cdd19SJun-ichiro itojun Hagino 			(val) = (typ)NULL;				\
339686cdd19SJun-ichiro itojun Hagino 			(m) = NULL;					\
340686cdd19SJun-ichiro itojun Hagino 		}							\
341686cdd19SJun-ichiro itojun Hagino 	}								\
3425c6ebad8SHajimu UMEMOTO } while (/*CONSTCOND*/ 0)
3438b615593SMarko Zec 
344686cdd19SJun-ichiro itojun Hagino #endif /*_KERNEL*/
345686cdd19SJun-ichiro itojun Hagino 
346686cdd19SJun-ichiro itojun Hagino #endif /* not _NETINET_IP6_H_ */
347