1/*-
  2 * SPDX-License-Identifier: BSD-3-Clause
  3 *
  4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  5 * All rights reserved.
  6 *
  7 * Redistribution and use in source and binary forms, with or without
  8 * modification, are permitted provided that the following conditions
  9 * are met:
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 * 2. Redistributions in binary form must reproduce the above copyright
 13 *    notice, this list of conditions and the following disclaimer in the
 14 *    documentation and/or other materials provided with the distribution.
 15 * 3. Neither the name of the project nor the names of its contributors
 16 *    may be used to endorse or promote products derived from this software
 17 *    without specific prior written permission.
 18 *
 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 29 * SUCH DAMAGE.
 30 *
 31 *	$KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
 32 */
 33
 34/*-
 35 * Copyright (c) 1982, 1986, 1993
 36 *	The Regents of the University of California.  All rights reserved.
 37 *
 38 * Redistribution and use in source and binary forms, with or without
 39 * modification, are permitted provided that the following conditions
 40 * are met:
 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. Neither the name of the University nor the names of its contributors
 47 *    may be used to endorse or promote products derived from this software
 48 *    without specific prior written permission.
 49 *
 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 53 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 60 * SUCH DAMAGE.
 61 *
 62 *	@(#)ip_var.h	8.1 (Berkeley) 6/10/93
 63 */
 64
 65#ifndef _NETINET6_IP6_VAR_H_
 66#define _NETINET6_IP6_VAR_H_
 67
 68#include <sys/epoch.h>
 69
 70#ifdef _KERNEL
 71struct ip6asfrag;		/* frag6.c */
 72TAILQ_HEAD(ip6fraghead, ip6asfrag);
 73
 74/*
 75 * IP6 reassembly queue structure.  Each fragment
 76 * being reassembled is attached to one of these structures.
 77 */
 78struct	ip6q {
 79	struct ip6fraghead ip6q_frags;
 80	u_int32_t	ip6q_ident;
 81	u_int8_t	ip6q_nxt;
 82	u_int8_t	ip6q_ecn;
 83	u_int16_t	ip6q_ttl;
 84	struct in6_addr ip6q_src, ip6q_dst;
 85	TAILQ_ENTRY(ip6q) ip6q_tq;
 86	int		ip6q_unfrglen;	/* len of unfragmentable part */
 87	int		ip6q_nfrag;	/* # of fragments */
 88	struct label	*ip6q_label;
 89};
 90#endif /* _KERNEL */
 91
 92/*
 93 * IP6 reinjecting structure.
 94 */
 95struct ip6_direct_ctx {
 96	uint32_t	ip6dc_nxt;	/* next header to process */
 97	uint32_t	ip6dc_off;	/* offset to next header */
 98};
 99
100#if defined(_NETINET6_IN6_VAR_H_) && defined(_KERNEL)
101/*
102 * Structure attached to inpcb.in6p_moptions and
103 * passed to ip6_output when IPv6 multicast options are in use.
104 * This structure is lazy-allocated.
105 */
106struct ip6_moptions {
107	struct	ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
108	u_char	im6o_multicast_hlim;	/* hoplimit for outgoing multicasts */
109	u_char	im6o_multicast_loop;	/* 1 >= hear sends if a member */
110	struct ip6_mfilter_head im6o_head; /* group membership list */
111};
112#else
113struct ip6_moptions;
114#endif
115/*
116 * Control options for outgoing packets
117 */
118
119/* Routing header related info */
120struct	ip6po_rhinfo {
121	struct	ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
122	struct	route_in6 ip6po_rhi_route; /* Route to the 1st hop */
123};
124#define ip6po_rthdr	ip6po_rhinfo.ip6po_rhi_rthdr
125#define ip6po_route	ip6po_rhinfo.ip6po_rhi_route
126
127/* Nexthop related info */
128struct	ip6po_nhinfo {
129	struct	sockaddr *ip6po_nhi_nexthop;
130	struct	route_in6 ip6po_nhi_route; /* Route to the nexthop */
131};
132#define ip6po_nexthop	ip6po_nhinfo.ip6po_nhi_nexthop
133#define ip6po_nextroute	ip6po_nhinfo.ip6po_nhi_route
134
135struct	ip6_pktopts {
136	struct	mbuf *ip6po_m;	/* Pointer to mbuf storing the data */
137	int	ip6po_hlim;	/* Hoplimit for outgoing packets */
138
139	/* Outgoing IF/address information */
140	struct	in6_pktinfo *ip6po_pktinfo;
141
142	/* Next-hop address information */
143	struct	ip6po_nhinfo ip6po_nhinfo;
144
145	struct	ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
146
147	/* Destination options header (before a routing header) */
148	struct	ip6_dest *ip6po_dest1;
149
150	/* Routing header related info. */
151	struct	ip6po_rhinfo ip6po_rhinfo;
152
153	/* Destination options header (after a routing header) */
154	struct	ip6_dest *ip6po_dest2;
155
156	int	ip6po_tclass;	/* traffic class */
157
158	int	ip6po_minmtu;  /* fragment vs PMTU discovery policy */
159#define IP6PO_MINMTU_MCASTONLY	-1 /* default; send at min MTU for multicast*/
160#define IP6PO_MINMTU_DISABLE	 0 /* always perform pmtu disc */
161#define IP6PO_MINMTU_ALL	 1 /* always send at min MTU */
162
163	int	ip6po_prefer_tempaddr;  /* whether temporary addresses are
164					   preferred as source address */
165#define IP6PO_TEMPADDR_SYSTEM	-1 /* follow the system default */
166#define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
167#define IP6PO_TEMPADDR_PREFER	 1 /* prefer temporary address */
168
169	int ip6po_flags;
170#if 0	/* parameters in this block is obsolete. do not reuse the values. */
171#define IP6PO_REACHCONF	0x01	/* upper-layer reachability confirmation. */
172#define IP6PO_MINMTU	0x02	/* use minimum MTU (IPV6_USE_MIN_MTU) */
173#endif
174#define IP6PO_DONTFRAG	0x04	/* disable fragmentation (IPV6_DONTFRAG) */
175#define IP6PO_USECOA	0x08	/* use care of address */
176};
177
178/*
179 * Control options for incoming packets
180 */
181
182struct	ip6stat {
183	uint64_t ip6s_total;		/* total packets received */
184	uint64_t ip6s_tooshort;		/* packet too short */
185	uint64_t ip6s_toosmall;		/* not enough data */
186	uint64_t ip6s_fragments;	/* fragments received */
187	uint64_t ip6s_fragdropped;	/* frags dropped(dups, out of space) */
188	uint64_t ip6s_fragtimeout;	/* fragments timed out */
189	uint64_t ip6s_fragoverflow;	/* fragments that exceeded limit */
190	uint64_t ip6s_forward;		/* packets forwarded */
191	uint64_t ip6s_cantforward;	/* packets rcvd for unreachable dest */
192	uint64_t ip6s_redirectsent;	/* packets forwarded on same net */
193	uint64_t ip6s_delivered;	/* datagrams delivered to upper level*/
194	uint64_t ip6s_localout;		/* total ip packets generated here */
195	uint64_t ip6s_odropped;		/* lost packets due to nobufs, etc. */
196	uint64_t ip6s_reassembled;	/* total packets reassembled ok */
197	uint64_t ip6s_atomicfrags;	/* atomic fragments */
198	uint64_t ip6s_fragmented;	/* datagrams successfully fragmented */
199	uint64_t ip6s_ofragments;	/* output fragments created */
200	uint64_t ip6s_cantfrag;		/* don't fragment flag was set, etc. */
201	uint64_t ip6s_badoptions;	/* error in option processing */
202	uint64_t ip6s_noroute;		/* packets discarded due to no route */
203	uint64_t ip6s_badvers;		/* ip6 version != 6 */
204	uint64_t ip6s_rawout;		/* total raw ip packets generated */
205	uint64_t ip6s_badscope;		/* scope error */
206	uint64_t ip6s_notmember;	/* don't join this multicast group */
207#define	IP6S_HDRCNT		256	/* headers count */
208	uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
209	uint64_t ip6s_m1;		/* one mbuf */
210#define	IP6S_M2MMAX		32
211	uint64_t ip6s_m2m[IP6S_M2MMAX];	/* two or more mbuf */
212	uint64_t ip6s_mext1;		/* one ext mbuf */
213	uint64_t ip6s_mext2m;		/* two or more ext mbuf */
214	uint64_t ip6s_exthdrtoolong;	/* ext hdr are not contiguous */
215	uint64_t ip6s_nogif;		/* no match gif found */
216	uint64_t ip6s_toomanyhdr;	/* discarded due to too many headers */
217
218	/*
219	 * statistics for improvement of the source address selection
220	 * algorithm:
221	 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
222	 */
223#define	IP6S_RULESMAX		16
224#define	IP6S_SCOPECNT		16
225	/* number of times that address selection fails */
226	uint64_t ip6s_sources_none;
227	/* number of times that an address on the outgoing I/F is chosen */
228	uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
229	/* number of times that an address on a non-outgoing I/F is chosen */
230	uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
231	/*
232	 * number of times that an address that has the same scope
233	 * from the destination is chosen.
234	 */
235	uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
236	/*
237	 * number of times that an address that has a different scope
238	 * from the destination is chosen.
239	 */
240	uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
241	/* number of times that a deprecated address is chosen */
242	uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
243
244	/* number of times that each rule of source selection is applied. */
245	uint64_t ip6s_sources_rule[IP6S_RULESMAX];
246};
247
248#ifdef _KERNEL
249#include <sys/counter.h>
250
251VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
252#define	IP6STAT_ADD(name, val)	\
253    VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
254#define	IP6STAT_SUB(name, val)	IP6STAT_ADD(name, -(val))
255#define	IP6STAT_INC(name)	IP6STAT_ADD(name, 1)
256#define	IP6STAT_DEC(name)	IP6STAT_SUB(name, 1)
257#endif
258
259#ifdef _KERNEL
260/* flags passed to ip6_output as last parameter */
261#define	IPV6_UNSPECSRC		0x01	/* allow :: as the source address */
262#define	IPV6_FORWARDING		0x02	/* most of IPv6 header exists */
263#define	IPV6_MINMTU		0x04	/* use minimum MTU (IPV6_USE_MIN_MTU) */
264
265#ifdef __NO_STRICT_ALIGNMENT
266#define IP6_HDR_ALIGNED_P(ip)	1
267#else
268#define IP6_HDR_ALIGNED_P(ip)	((((intptr_t) (ip)) & 3) == 0)
269#endif
270
271VNET_DECLARE(int, ip6_defhlim);		/* default hop limit */
272VNET_DECLARE(int, ip6_defmcasthlim);	/* default multicast hop limit */
273VNET_DECLARE(int, ip6_forwarding);	/* act as router? */
274VNET_DECLARE(int, ip6_use_deprecated);	/* allow deprecated addr as source */
275VNET_DECLARE(int, ip6_rr_prune);	/* router renumbering prefix
276					 * walk list every 5 sec.    */
277VNET_DECLARE(int, ip6_mcast_pmtu);	/* enable pMTU discovery for multicast? */
278VNET_DECLARE(int, ip6_v6only);
279#define	V_ip6_defhlim			VNET(ip6_defhlim)
280#define	V_ip6_defmcasthlim		VNET(ip6_defmcasthlim)
281#define	V_ip6_forwarding		VNET(ip6_forwarding)
282#define	V_ip6_use_deprecated		VNET(ip6_use_deprecated)
283#define	V_ip6_rr_prune			VNET(ip6_rr_prune)
284#define	V_ip6_mcast_pmtu		VNET(ip6_mcast_pmtu)
285#define	V_ip6_v6only			VNET(ip6_v6only)
286
287VNET_DECLARE(struct socket *, ip6_mrouter);	/* multicast routing daemon */
288VNET_DECLARE(int, ip6_sendredirects);	/* send IP redirects when forwarding? */
289VNET_DECLARE(int, ip6_accept_rtadv);	/* Acts as a host not a router */
290VNET_DECLARE(int, ip6_no_radr);		/* No defroute from RA */
291VNET_DECLARE(int, ip6_norbit_raif);	/* Disable R-bit in NA on RA
292					 * receiving IF. */
293VNET_DECLARE(int, ip6_rfc6204w3);	/* Accept defroute from RA even when
294					   forwarding enabled */
295VNET_DECLARE(int, ip6_hdrnestlimit);	/* upper limit of # of extension
296					 * headers */
297VNET_DECLARE(int, ip6_dad_count);	/* DupAddrDetectionTransmits */
298#define	V_ip6_mrouter			VNET(ip6_mrouter)
299#define	V_ip6_sendredirects		VNET(ip6_sendredirects)
300#define	V_ip6_accept_rtadv		VNET(ip6_accept_rtadv)
301#define	V_ip6_no_radr			VNET(ip6_no_radr)
302#define	V_ip6_norbit_raif		VNET(ip6_norbit_raif)
303#define	V_ip6_rfc6204w3			VNET(ip6_rfc6204w3)
304#define	V_ip6_hdrnestlimit		VNET(ip6_hdrnestlimit)
305#define	V_ip6_dad_count			VNET(ip6_dad_count)
306
307VNET_DECLARE(int, ip6_auto_flowlabel);
308VNET_DECLARE(int, ip6_auto_linklocal);
309#define	V_ip6_auto_flowlabel		VNET(ip6_auto_flowlabel)
310#define	V_ip6_auto_linklocal		VNET(ip6_auto_linklocal)
311
312VNET_DECLARE(int, ip6_use_tempaddr);	/* Whether to use temporary addresses */
313VNET_DECLARE(int, ip6_prefer_tempaddr);	/* Whether to prefer temporary
314					 * addresses in the source address
315					 * selection */
316#define	V_ip6_use_tempaddr		VNET(ip6_use_tempaddr)
317#define	V_ip6_prefer_tempaddr		VNET(ip6_prefer_tempaddr)
318
319VNET_DECLARE(int, ip6_use_defzone);	/* Whether to use the default scope
320					 * zone when unspecified */
321#define	V_ip6_use_defzone		VNET(ip6_use_defzone)
322
323VNET_DECLARE(struct pfil_head *, inet6_pfil_head);
324#define	V_inet6_pfil_head	VNET(inet6_pfil_head)
325#define	PFIL_INET6_NAME		"inet6"
326
327VNET_DECLARE(struct pfil_head *, inet6_local_pfil_head);
328#define	V_inet6_local_pfil_head	VNET(inet6_local_pfil_head)
329#define	PFIL_INET6_LOCAL_NAME	"inet6-local"
330
331#ifdef IPSTEALTH
332VNET_DECLARE(int, ip6stealth);
333#define	V_ip6stealth			VNET(ip6stealth)
334#endif
335
336VNET_DECLARE(bool, ip6_log_cannot_forward);
337#define	V_ip6_log_cannot_forward	VNET(ip6_log_cannot_forward)
338
339extern struct	pr_usrreqs rip6_usrreqs;
340struct sockopt;
341
342struct inpcb;
343struct ucred;
344
345int	icmp6_ctloutput(struct socket *, struct sockopt *sopt);
346
347void	ip6_input(struct mbuf *);
348void	ip6_direct_input(struct mbuf *);
349void	ip6_freepcbopts(struct ip6_pktopts *);
350
351int	ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
352int	ip6_get_prevhdr(const struct mbuf *, int);
353int	ip6_nexthdr(const struct mbuf *, int, int, int *);
354int	ip6_lasthdr(const struct mbuf *, int, int, int *);
355
356extern int	(*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
357    struct mbuf *);
358
359int	ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
360				 u_int32_t *);
361struct mbuf	**ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
362	    struct mbuf **, int *);
363void	ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
364void	ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
365int	ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
366
367void	ip6_forward(struct mbuf *, int);
368
369void	ip6_mloopback(struct ifnet *, struct mbuf *);
370int	ip6_output(struct mbuf *, struct ip6_pktopts *,
371			struct route_in6 *,
372			int,
373			struct ip6_moptions *, struct ifnet **,
374			struct inpcb *);
375int	ip6_ctloutput(struct socket *, struct sockopt *);
376int	ip6_raw_ctloutput(struct socket *, struct sockopt *);
377void	ip6_initpktopts(struct ip6_pktopts *);
378int	ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
379	struct ip6_pktopts *, struct ucred *, int);
380void	ip6_clearpktopts(struct ip6_pktopts *, int);
381struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
382int	ip6_optlen(struct inpcb *);
383int	ip6_deletefraghdr(struct mbuf *, int, int);
384int	ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
385			uint32_t);
386
387int	route6_input(struct mbuf **, int *, int);
388
389void	frag6_init(void);
390void	frag6_destroy(void);
391int	frag6_input(struct mbuf **, int *, int);
392void	frag6_drain(void);
393
394void	rip6_init(void);
395int	rip6_ctloutput(struct socket *, struct sockopt *);
396int	rip6_usrreq(struct socket *,
397	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
398
399int	dest6_input(struct mbuf **, int *, int);
400int	none_input(struct mbuf **, int *, int);
401
402int	in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
403    struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
404int	in6_selectsrc_addr(uint32_t, const struct in6_addr *,
405    uint32_t, struct ifnet *, struct in6_addr *, int *);
406int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
407	struct ip6_moptions *, struct route_in6 *, struct ifnet **,
408	struct nhop_object **, u_int, uint32_t);
409u_int32_t ip6_randomid(void);
410u_int32_t ip6_randomflowlabel(void);
411void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
412
413int	ip6_log_ratelimit(void);
414
415/*
416 * Argument type for the last arg of ip6proto_ctlinput_t().
417 *
418 * IPv6 ICMP IPv6 [exthdrs] finalhdr payload
419 * ^    ^    ^              ^
420 * |    |    ip6c_ip6       ip6c_off
421 * |    ip6c_icmp6
422 * ip6c_m
423 *
424 * ip6c_finaldst's sin6_addr usually points to ip6c_ip6->ip6_dst.  If the
425 * original * (internal) packet carries a routing header, it may point the
426 * final * destination address in the routing header.
427 *
428 * ip6c_src: ip6c_ip6->ip6_src + scope info + flowlabel in ip6c_ip6
429 *	(beware of flowlabel, if you try to compare it against others)
430 * ip6c_dst: ip6c_finaldst + scope info
431 */
432struct ip6ctlparam {
433	struct mbuf *ip6c_m;		/* start of mbuf chain */
434	struct icmp6_hdr *ip6c_icmp6;	/* icmp6 header of target packet */
435	struct ip6_hdr *ip6c_ip6;	/* ip6 header of target packet */
436	int ip6c_off;			/* offset of the target proto header */
437	struct sockaddr_in6 *ip6c_src;	/* srcaddr w/ additional info */
438	struct sockaddr_in6 *ip6c_dst;	/* (final) dstaddr w/ additional info */
439	struct sockaddr_in6 *ip6c_finaldst;	/* final destination address */
440	void *ip6c_cmdarg;		/* control command dependent data */
441	u_int8_t ip6c_nxt;		/* final next header field */
442};
443
444typedef int	ip6proto_input_t(struct mbuf **, int *, int);
445typedef void	ip6proto_ctlinput_t(struct ip6ctlparam *);
446int	ip6proto_register(uint8_t, ip6proto_input_t, ip6proto_ctlinput_t);
447int	ip6proto_unregister(uint8_t);
448#define	IP6PROTO_REGISTER(prot, input, ctl)	do {			\
449	int error __diagused;						\
450	error = ip6proto_register(prot, input, ctl);			\
451	MPASS(error == 0);						\
452} while (0)
453
454ip6proto_input_t	rip6_input;
455ip6proto_ctlinput_t	rip6_ctlinput;
456
457#endif /* _KERNEL */
458
459#endif /* !_NETINET6_IP6_VAR_H_ */