[apple/xnu.git] / bsd / netinet / ip6.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*	$KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ip.h	8.1 (Berkeley) 6/10/93
 */

#ifndef _NETINET_IP6_H_
#define _NETINET_IP6_H_
#include <sys/appleapiopts.h>

/*
 * Definition for internet protocol version 6.
 * RFC 2460
 */

struct ip6_hdr {
	union {
		struct ip6_hdrctl {
			u_int32_t ip6_un1_flow;	/* 20 bits of flow-ID */
			u_int16_t ip6_un1_plen;	/* payload length */
			u_int8_t  ip6_un1_nxt;	/* next header */
			u_int8_t  ip6_un1_hlim;	/* hop limit */
		} ip6_un1;
		u_int8_t ip6_un2_vfc;	/* 4 bits version, top 4 bits class */
	} ip6_ctlun;
	struct in6_addr ip6_src;	/* source address */
	struct in6_addr ip6_dst;	/* destination address */
} __attribute__((__packed__));

#define ip6_vfc		ip6_ctlun.ip6_un2_vfc
#define ip6_flow	ip6_ctlun.ip6_un1.ip6_un1_flow
#define ip6_plen	ip6_ctlun.ip6_un1.ip6_un1_plen
#define ip6_nxt		ip6_ctlun.ip6_un1.ip6_un1_nxt
#define ip6_hlim	ip6_ctlun.ip6_un1.ip6_un1_hlim
#define ip6_hops	ip6_ctlun.ip6_un1.ip6_un1_hlim

#define IPV6_VERSION		0x60
#define IPV6_VERSION_MASK	0xf0

#if BYTE_ORDER == BIG_ENDIAN
#define IPV6_FLOWINFO_MASK	0x0fffffff	/* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK	0x000fffff	/* flow label (20 bits) */
#else
#if BYTE_ORDER == LITTLE_ENDIAN
#define IPV6_FLOWINFO_MASK	0xffffff0f	/* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK	0xffff0f00	/* flow label (20 bits) */
#endif /* LITTLE_ENDIAN */
#endif
#if 1
/* ECN bits proposed by Sally Floyd */
#define IP6TOS_CE		0x01	/* congestion experienced */
#define IP6TOS_ECT		0x02	/* ECN-capable transport */
#endif

/*
 * Extension Headers
 */

struct	ip6_ext {
	u_int8_t ip6e_nxt;
	u_int8_t ip6e_len;
} __attribute__((__packed__));

/* Hop-by-Hop options header */
/* XXX should we pad it to force alignment on an 8-byte boundary? */
struct ip6_hbh {
	u_int8_t ip6h_nxt;	/* next header */
	u_int8_t ip6h_len;	/* length in units of 8 octets */
	/* followed by options */
} __attribute__((__packed__));

/* Destination options header */
/* XXX should we pad it to force alignment on an 8-byte boundary? */
struct ip6_dest {
	u_int8_t ip6d_nxt;	/* next header */
	u_int8_t ip6d_len;	/* length in units of 8 octets */
	/* followed by options */
} __attribute__((__packed__));

/* Option types and related macros */
#define IP6OPT_PAD1		0x00	/* 00 0 00000 */
#define IP6OPT_PADN		0x01	/* 00 0 00001 */
#define IP6OPT_JUMBO		0xC2	/* 11 0 00010 = 194 */
#define IP6OPT_NSAP_ADDR	0xC3	/* 11 0 00011 */
#define IP6OPT_TUNNEL_LIMIT	0x04	/* 00 0 00100 */
#define IP6OPT_RTALERT		0x05	/* 00 0 00101 (KAME definition) */

#define IP6OPT_RTALERT_LEN	4
#define IP6OPT_RTALERT_MLD	0	/* Datagram contains an MLD message */
#define IP6OPT_RTALERT_RSVP	1	/* Datagram contains an RSVP message */
#define IP6OPT_RTALERT_ACTNET	2 	/* contains an Active Networks msg */
#define IP6OPT_MINLEN		2

#define IP6OPT_BINDING_UPDATE	0xc6	/* 11 0 00110 */
#define IP6OPT_BINDING_ACK	0x07	/* 00 0 00111 */
#define IP6OPT_BINDING_REQ	0x08	/* 00 0 01000 */
#define IP6OPT_HOME_ADDRESS	0xc9	/* 11 0 01001 */
#define IP6OPT_EID		0x8a	/* 10 0 01010 */

#define IP6OPT_TYPE(o)		((o) & 0xC0)
#define IP6OPT_TYPE_SKIP	0x00
#define IP6OPT_TYPE_DISCARD	0x40
#define IP6OPT_TYPE_FORCEICMP	0x80
#define IP6OPT_TYPE_ICMP	0xC0

#define IP6OPT_MUTABLE		0x20

#define IP6OPT_JUMBO_LEN	6

/* Routing header */
struct ip6_rthdr {
	u_int8_t  ip6r_nxt;	/* next header */
	u_int8_t  ip6r_len;	/* length in units of 8 octets */
	u_int8_t  ip6r_type;	/* routing type */
	u_int8_t  ip6r_segleft;	/* segments left */
	/* followed by routing type specific data */
} __attribute__((__packed__));

/* Type 0 Routing header */
struct ip6_rthdr0 {
	u_int8_t  ip6r0_nxt;		/* next header */
	u_int8_t  ip6r0_len;		/* length in units of 8 octets */
	u_int8_t  ip6r0_type;		/* always zero */
	u_int8_t  ip6r0_segleft;	/* segments left */
	u_int8_t  ip6r0_reserved;	/* reserved field */
	u_int8_t  ip6r0_slmap[3];	/* strict/loose bit map */
	struct in6_addr  ip6r0_addr[1];	/* up to 23 addresses */
} __attribute__((__packed__));

/* Fragment header */
struct ip6_frag {
	u_int8_t  ip6f_nxt;		/* next header */
	u_int8_t  ip6f_reserved;	/* reserved field */
	u_int16_t ip6f_offlg;		/* offset, reserved, and flag */
	u_int32_t ip6f_ident;		/* identification */
} __attribute__((__packed__));

#if BYTE_ORDER == BIG_ENDIAN
#define IP6F_OFF_MASK		0xfff8	/* mask out offset from _offlg */
#define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG		0x0001	/* more-fragments flag */
#else /* BYTE_ORDER == LITTLE_ENDIAN */
#define IP6F_OFF_MASK		0xf8ff	/* mask out offset from _offlg */
#define IP6F_RESERVED_MASK	0x0600	/* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG		0x0100	/* more-fragments flag */
#endif /* BYTE_ORDER == LITTLE_ENDIAN */

/*
 * Internet implementation parameters.
 */
#define IPV6_MAXHLIM	255	/* maximun hoplimit */
#define IPV6_DEFHLIM	64	/* default hlim */
#define IPV6_FRAGTTL	120	/* ttl for fragment packets, in slowtimo tick */
#define IPV6_HLIMDEC	1	/* subtracted when forwaeding */

#define IPV6_MMTU	1280	/* minimal MTU and reassembly. 1024 + 256 */
#define IPV6_MAXPACKET	65535	/* ip6 max packet size without Jumbo payload*/

#ifdef KERNEL_PRIVATE
/*
 * IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
 * target header (including IPv6 itself, extension headers and
 * TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
 * to store incoming data into one internal mbuf or one or more external
 * mbufs(never into two or more internal mbufs). Thus, the third case is
 * supposed to never be matched but is prepared just in case.
 */

#define IP6_EXTHDR_CHECK(m, off, hlen, action)				\
do {									\
    if ((m)->m_next != NULL) {						\
	if (((m)->m_flags & M_LOOP) &&					\
	    ((m)->m_len < (off) + (hlen)) &&				\
	    (((m) = m_pullup((m), (off) + (hlen))) == NULL)) {		\
		ip6stat.ip6s_exthdrtoolong++;				\
		action;							\
	} else if ((m)->m_flags & M_EXT) {				\
		if ((m)->m_len < (off) + (hlen)) {			\
			ip6stat.ip6s_exthdrtoolong++;			\
			m_freem(m);					\
			action;						\
		}							\
	} else {							\
		if ((m)->m_len < (off) + (hlen)) {			\
			ip6stat.ip6s_exthdrtoolong++;			\
			m_freem(m);					\
			action;						\
		}							\
	}								\
    } else {								\
	if ((m)->m_len < (off) + (hlen)) {				\
		ip6stat.ip6s_tooshort++;				\
		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);	\
		m_freem(m);						\
		action;							\
	}								\
    }									\
} while (0)

/*
 * IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
 * "len") is located in single mbuf, on contiguous memory region.
 * The pointer to the region will be returned to pointer variable "val",
 * with type "typ".
 * IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
 * very top of mbuf.  GET0 is likely to make memory copy than GET.
 *
 * XXX we're now testing this, needs m_pulldown()
 */
#define IP6_EXTHDR_GET(val, typ, m, off, len) \
do {									\
	struct mbuf *t;							\
	int tmp;							\
	if ((m)->m_len >= (off) + (len))				\
		(val) = (typ)(mtod((m), caddr_t) + (off));		\
	else {								\
		t = m_pulldown((m), (off), (len), &tmp);		\
		if (t) {						\
			if (t->m_len < tmp + (len))			\
				panic("m_pulldown malfunction");	\
			(val) = (typ)(mtod(t, caddr_t) + tmp);		\
		} else {						\
			(val) = (typ)NULL;				\
			(m) = NULL;					\
		}							\
	}								\
} while (0)

#define IP6_EXTHDR_GET0(val, typ, m, off, len) \
do {									\
	struct mbuf *t;							\
	if ((off) == 0)							\
		(val) = (typ)mtod(m, caddr_t);				\
	else {								\
		t = m_pulldown((m), (off), (len), NULL);		\
		if (t) {						\
			if (t->m_len < (len))				\
				panic("m_pulldown malfunction");	\
			(val) = (typ)mtod(t, caddr_t);			\
		} else {						\
			(val) = (typ)NULL;				\
			(m) = NULL;					\
		}							\
	}								\
} while (0)

#endif KERNEL_PRIVATE
#endif !_NETINET_IP6_H_
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b	27	*/
9bccf70c	28	/* $KAME: ip6.h,v 1.18 2001/03/29 05:34:30 itojun Exp $*/
1c79356b A	29
	30	/*
	31	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	32	* All rights reserved.
	33	*
	34	* Redistribution and use in source and binary forms, with or without
	35	* modification, are permitted provided that the following conditions
	36	* are met:
	37	* 1. Redistributions of source code must retain the above copyright
	38	* notice, this list of conditions and the following disclaimer.
	39	* 2. Redistributions in binary form must reproduce the above copyright
	40	* notice, this list of conditions and the following disclaimer in the
	41	* documentation and/or other materials provided with the distribution.
	42	* 3. Neither the name of the project nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*/
	58
	59	/*
	60	* Copyright (c) 1982, 1986, 1993
	61	* The Regents of the University of California. All rights reserved.
	62	*
	63	* Redistribution and use in source and binary forms, with or without
	64	* modification, are permitted provided that the following conditions
	65	* are met:
	66	* 1. Redistributions of source code must retain the above copyright
	67	* notice, this list of conditions and the following disclaimer.
	68	* 2. Redistributions in binary form must reproduce the above copyright
	69	* notice, this list of conditions and the following disclaimer in the
	70	* documentation and/or other materials provided with the distribution.
	71	* 3. All advertising materials mentioning features or use of this software
	72	* must display the following acknowledgement:
	73	* This product includes software developed by the University of
	74	* California, Berkeley and its contributors.
	75	* 4. Neither the name of the University nor the names of its contributors
	76	* may be used to endorse or promote products derived from this software
	77	* without specific prior written permission.
	78	*
	79	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	80	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	81	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	82	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	83	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	84	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	85	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	86	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	87	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	88	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	89	* SUCH DAMAGE.
	90	*
	91	* @(#)ip.h 8.1 (Berkeley) 6/10/93
	92	*/
93
94	#ifndef _NETINET_IP6_H_
95	#define _NETINET_IP6_H_
9bccf70c	96	#include <sys/appleapiopts.h>
1c79356b A	97
	98	/*
	99	* Definition for internet protocol version 6.
	100	* RFC 2460
	101	*/
	102
	103	struct ip6_hdr {
	104	union {
	105	struct ip6_hdrctl {
	106	u_int32_t ip6_un1_flow; /* 20 bits of flow-ID */
	107	u_int16_t ip6_un1_plen; /* payload length */
	108	u_int8_t ip6_un1_nxt; /* next header */
	109	u_int8_t ip6_un1_hlim; /* hop limit */
	110	} ip6_un1;
	111	u_int8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
	112	} ip6_ctlun;
	113	struct in6_addr ip6_src; /* source address */
	114	struct in6_addr ip6_dst; /* destination address */
9bccf70c	115	} __attribute__((__packed__));
1c79356b A	116
	117	#define ip6_vfc ip6_ctlun.ip6_un2_vfc
	118	#define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
	119	#define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
	120	#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
	121	#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
	122	#define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
	123
	124	#define IPV6_VERSION 0x60
	125	#define IPV6_VERSION_MASK 0xf0
	126
	127	#if BYTE_ORDER == BIG_ENDIAN
	128	#define IPV6_FLOWINFO_MASK 0x0fffffff /* flow info (28 bits) */
	129	#define IPV6_FLOWLABEL_MASK 0x000fffff /* flow label (20 bits) */
	130	#else
	131	#if BYTE_ORDER == LITTLE_ENDIAN
	132	#define IPV6_FLOWINFO_MASK 0xffffff0f /* flow info (28 bits) */
	133	#define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */
	134	#endif /* LITTLE_ENDIAN */
	135	#endif
	136	#if 1
	137	/* ECN bits proposed by Sally Floyd */
	138	#define IP6TOS_CE 0x01 /* congestion experienced */
	139	#define IP6TOS_ECT 0x02 /* ECN-capable transport */
	140	#endif
	141
	142	/*
	143	* Extension Headers
	144	*/
	145
	146	struct ip6_ext {
9bccf70c A	147	u_int8_t ip6e_nxt;
	148	u_int8_t ip6e_len;
	149	} __attribute__((__packed__));
1c79356b A	150
	151	/* Hop-by-Hop options header */
	152	/* XXX should we pad it to force alignment on an 8-byte boundary? */
	153	struct ip6_hbh {
	154	u_int8_t ip6h_nxt; /* next header */
	155	u_int8_t ip6h_len; /* length in units of 8 octets */
	156	/* followed by options */
9bccf70c	157	} __attribute__((__packed__));
1c79356b A	158
	159	/* Destination options header */
	160	/* XXX should we pad it to force alignment on an 8-byte boundary? */
	161	struct ip6_dest {
	162	u_int8_t ip6d_nxt; /* next header */
	163	u_int8_t ip6d_len; /* length in units of 8 octets */
	164	/* followed by options */
9bccf70c	165	} __attribute__((__packed__));
1c79356b A	166
	167	/* Option types and related macros */
	168	#define IP6OPT_PAD1 0x00 /* 00 0 00000 */
	169	#define IP6OPT_PADN 0x01 /* 00 0 00001 */
	170	#define IP6OPT_JUMBO 0xC2 /* 11 0 00010 = 194 */
	171	#define IP6OPT_NSAP_ADDR 0xC3 /* 11 0 00011 */
	172	#define IP6OPT_TUNNEL_LIMIT 0x04 /* 00 0 00100 */
	173	#define IP6OPT_RTALERT 0x05 /* 00 0 00101 (KAME definition) */
1c79356b A	174
	175	#define IP6OPT_RTALERT_LEN 4
	176	#define IP6OPT_RTALERT_MLD 0 /* Datagram contains an MLD message */
	177	#define IP6OPT_RTALERT_RSVP 1 /* Datagram contains an RSVP message */
	178	#define IP6OPT_RTALERT_ACTNET 2 /* contains an Active Networks msg */
	179	#define IP6OPT_MINLEN 2
	180
9bccf70c A	181	#define IP6OPT_BINDING_UPDATE 0xc6 /* 11 0 00110 */
	182	#define IP6OPT_BINDING_ACK 0x07 /* 00 0 00111 */
	183	#define IP6OPT_BINDING_REQ 0x08 /* 00 0 01000 */
	184	#define IP6OPT_HOME_ADDRESS 0xc9 /* 11 0 01001 */
	185	#define IP6OPT_EID 0x8a /* 10 0 01010 */
1c79356b A	186
	187	#define IP6OPT_TYPE(o) ((o) & 0xC0)
	188	#define IP6OPT_TYPE_SKIP 0x00
	189	#define IP6OPT_TYPE_DISCARD 0x40
	190	#define IP6OPT_TYPE_FORCEICMP 0x80
	191	#define IP6OPT_TYPE_ICMP 0xC0
	192
	193	#define IP6OPT_MUTABLE 0x20
	194
9bccf70c	195	#define IP6OPT_JUMBO_LEN 6
1c79356b A	196
	197	/* Routing header */
	198	struct ip6_rthdr {
	199	u_int8_t ip6r_nxt; /* next header */
	200	u_int8_t ip6r_len; /* length in units of 8 octets */
	201	u_int8_t ip6r_type; /* routing type */
	202	u_int8_t ip6r_segleft; /* segments left */
	203	/* followed by routing type specific data */
9bccf70c	204	} __attribute__((__packed__));
1c79356b A	205
	206	/* Type 0 Routing header */
	207	struct ip6_rthdr0 {
	208	u_int8_t ip6r0_nxt; /* next header */
	209	u_int8_t ip6r0_len; /* length in units of 8 octets */
	210	u_int8_t ip6r0_type; /* always zero */
	211	u_int8_t ip6r0_segleft; /* segments left */
9bccf70c A	212	u_int8_t ip6r0_reserved; /* reserved field */
	213	u_int8_t ip6r0_slmap[3]; /* strict/loose bit map */
	214	struct in6_addr ip6r0_addr[1]; /* up to 23 addresses */
	215	} __attribute__((__packed__));
1c79356b A	216
	217	/* Fragment header */
	218	struct ip6_frag {
	219	u_int8_t ip6f_nxt; /* next header */
	220	u_int8_t ip6f_reserved; /* reserved field */
	221	u_int16_t ip6f_offlg; /* offset, reserved, and flag */
	222	u_int32_t ip6f_ident; /* identification */
9bccf70c	223	} __attribute__((__packed__));
1c79356b A	224
	225	#if BYTE_ORDER == BIG_ENDIAN
	226	#define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
	227	#define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
	228	#define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
	229	#else /* BYTE_ORDER == LITTLE_ENDIAN */
	230	#define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
	231	#define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
	232	#define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
	233	#endif /* BYTE_ORDER == LITTLE_ENDIAN */
	234
	235	/*
	236	* Internet implementation parameters.
	237	*/
	238	#define IPV6_MAXHLIM 255 /* maximun hoplimit */
	239	#define IPV6_DEFHLIM 64 /* default hlim */
	240	#define IPV6_FRAGTTL 120 /* ttl for fragment packets, in slowtimo tick */
	241	#define IPV6_HLIMDEC 1 /* subtracted when forwaeding */
	242
	243	#define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
	244	#define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
	245
91447636	246	#ifdef KERNEL_PRIVATE
1c79356b A	247	/*
	248	* IP6_EXTHDR_CHECK ensures that region between the IP6 header and the
	249	* target header (including IPv6 itself, extension headers and
	250	* TCP/UDP/ICMP6 headers) are continuous. KAME requires drivers
	251	* to store incoming data into one internal mbuf or one or more external
	252	* mbufs(never into two or more internal mbufs). Thus, the third case is
	253	* supposed to never be matched but is prepared just in case.
	254	*/
	255
91447636	256	#define IP6_EXTHDR_CHECK(m, off, hlen, action) \
1c79356b A	257	do { \
	258	if ((m)->m_next != NULL) { \
	259	if (((m)->m_flags & M_LOOP) && \
	260	((m)->m_len < (off) + (hlen)) && \
	261	(((m) = m_pullup((m), (off) + (hlen))) == NULL)) { \
	262	ip6stat.ip6s_exthdrtoolong++; \
91447636	263	action; \
1c79356b A	264	} else if ((m)->m_flags & M_EXT) { \
	265	if ((m)->m_len < (off) + (hlen)) { \
	266	ip6stat.ip6s_exthdrtoolong++; \
	267	m_freem(m); \
91447636	268	action; \
1c79356b A	269	} \
	270	} else { \
	271	if ((m)->m_len < (off) + (hlen)) { \
	272	ip6stat.ip6s_exthdrtoolong++; \
	273	m_freem(m); \
91447636	274	action; \
1c79356b A	275	} \
1c79356b A	276	} \
9bccf70c	277	} else { \
1c79356b A	278	if ((m)->m_len < (off) + (hlen)) { \
	279	ip6stat.ip6s_tooshort++; \
	280	in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); \
	281	m_freem(m); \
91447636	282	action; \
1c79356b A	283	} \
	284	} \
	285	} while (0)
	286
	287	/*
	288	* IP6_EXTHDR_GET ensures that intermediate protocol header (from "off" to
	289	* "len") is located in single mbuf, on contiguous memory region.
	290	* The pointer to the region will be returned to pointer variable "val",
	291	* with type "typ".
	292	* IP6_EXTHDR_GET0 does the same, except that it aligns the structure at the
	293	* very top of mbuf. GET0 is likely to make memory copy than GET.
	294	*
	295	* XXX we're now testing this, needs m_pulldown()
	296	*/
	297	#define IP6_EXTHDR_GET(val, typ, m, off, len) \
	298	do { \
	299	struct mbuf *t; \
	300	int tmp; \
1c79356b A	301	if ((m)->m_len >= (off) + (len)) \
	302	(val) = (typ)(mtod((m), caddr_t) + (off)); \
	303	else { \
	304	t = m_pulldown((m), (off), (len), &tmp); \
	305	if (t) { \
	306	if (t->m_len < tmp + (len)) \
	307	panic("m_pulldown malfunction"); \
	308	(val) = (typ)(mtod(t, caddr_t) + tmp); \
	309	} else { \
	310	(val) = (typ)NULL; \
	311	(m) = NULL; \
	312	} \
	313	} \
	314	} while (0)
	315
	316	#define IP6_EXTHDR_GET0(val, typ, m, off, len) \
	317	do { \
	318	struct mbuf *t; \
1c79356b A	319	if ((off) == 0) \
	320	(val) = (typ)mtod(m, caddr_t); \
	321	else { \
	322	t = m_pulldown((m), (off), (len), NULL); \
	323	if (t) { \
	324	if (t->m_len < (len)) \
	325	panic("m_pulldown malfunction"); \
	326	(val) = (typ)mtod(t, caddr_t); \
	327	} else { \
	328	(val) = (typ)NULL; \
	329	(m) = NULL; \
	330	} \
	331	} \
	332	} while (0)
1c79356b	333
91447636 A	334	#endif KERNEL_PRIVATE
91447636 A	335	#endif !_NETINET_IP6_H_