xref: /openbmc/linux/include/net/ipv6.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 /*
2  *	Linux INET6 implementation
3  *
4  *	Authors:
5  *	Pedro Roque		<roque@di.fc.ul.pt>
6  *
7  *	$Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
8  *
9  *	This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14 
15 #ifndef _NET_IPV6_H
16 #define _NET_IPV6_H
17 
18 #include <linux/ipv6.h>
19 #include <linux/hardirq.h>
20 #include <net/ndisc.h>
21 #include <net/flow.h>
22 #include <net/snmp.h>
23 
24 #define SIN6_LEN_RFC2133	24
25 
26 #define IPV6_MAXPLEN		65535
27 
28 /*
29  *	NextHeader field of IPv6 header
30  */
31 
32 #define NEXTHDR_HOP		0	/* Hop-by-hop option header. */
33 #define NEXTHDR_TCP		6	/* TCP segment. */
34 #define NEXTHDR_UDP		17	/* UDP message. */
35 #define NEXTHDR_IPV6		41	/* IPv6 in IPv6 */
36 #define NEXTHDR_ROUTING		43	/* Routing header. */
37 #define NEXTHDR_FRAGMENT	44	/* Fragmentation/reassembly header. */
38 #define NEXTHDR_ESP		50	/* Encapsulating security payload. */
39 #define NEXTHDR_AUTH		51	/* Authentication header. */
40 #define NEXTHDR_ICMP		58	/* ICMP for IPv6. */
41 #define NEXTHDR_NONE		59	/* No next header */
42 #define NEXTHDR_DEST		60	/* Destination options header. */
43 #define NEXTHDR_MOBILITY	135	/* Mobility header. */
44 
45 #define NEXTHDR_MAX		255
46 
47 
48 
49 #define IPV6_DEFAULT_HOPLIMIT   64
50 #define IPV6_DEFAULT_MCASTHOPS	1
51 
52 /*
53  *	Addr type
54  *
55  *	type	-	unicast | multicast
56  *	scope	-	local	| site	    | global
57  *	v4	-	compat
58  *	v4mapped
59  *	any
60  *	loopback
61  */
62 
63 #define IPV6_ADDR_ANY		0x0000U
64 
65 #define IPV6_ADDR_UNICAST      	0x0001U
66 #define IPV6_ADDR_MULTICAST    	0x0002U
67 
68 #define IPV6_ADDR_LOOPBACK	0x0010U
69 #define IPV6_ADDR_LINKLOCAL	0x0020U
70 #define IPV6_ADDR_SITELOCAL	0x0040U
71 
72 #define IPV6_ADDR_COMPATv4	0x0080U
73 
74 #define IPV6_ADDR_SCOPE_MASK	0x00f0U
75 
76 #define IPV6_ADDR_MAPPED	0x1000U
77 #define IPV6_ADDR_RESERVED	0x2000U	/* reserved address space */
78 
79 /*
80  *	Addr scopes
81  */
82 #ifdef __KERNEL__
83 #define IPV6_ADDR_MC_SCOPE(a)	\
84 	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
85 #define __IPV6_ADDR_SCOPE_INVALID	-1
86 #endif
87 #define IPV6_ADDR_SCOPE_NODELOCAL	0x01
88 #define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
89 #define IPV6_ADDR_SCOPE_SITELOCAL	0x05
90 #define IPV6_ADDR_SCOPE_ORGLOCAL	0x08
91 #define IPV6_ADDR_SCOPE_GLOBAL		0x0e
92 
93 /*
94  *	fragmentation header
95  */
96 
97 struct frag_hdr {
98 	__u8	nexthdr;
99 	__u8	reserved;
100 	__be16	frag_off;
101 	__be32	identification;
102 };
103 
104 #define	IP6_MF	0x0001
105 
106 #ifdef __KERNEL__
107 
108 #include <net/sock.h>
109 
110 /* sysctls */
111 extern int sysctl_ipv6_bindv6only;
112 extern int sysctl_mld_max_msf;
113 
114 /* MIBs */
115 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
116 #define IP6_INC_STATS(idev,field)		({			\
117 	struct inet6_dev *_idev = (idev);				\
118 	if (likely(_idev != NULL))					\
119 		SNMP_INC_STATS(_idev->stats.ipv6, field);		\
120 	SNMP_INC_STATS(ipv6_statistics, field);				\
121 })
122 #define IP6_INC_STATS_BH(idev,field)		({			\
123 	struct inet6_dev *_idev = (idev);				\
124 	if (likely(_idev != NULL))					\
125 		SNMP_INC_STATS_BH(_idev->stats.ipv6, field);		\
126 	SNMP_INC_STATS_BH(ipv6_statistics, field);			\
127 })
128 #define IP6_INC_STATS_USER(idev,field)		({			\
129 	struct inet6_dev *_idev = (idev);				\
130 	if (likely(_idev != NULL))					\
131 		SNMP_INC_STATS_USER(_idev->stats.ipv6, field);		\
132 	SNMP_INC_STATS_USER(ipv6_statistics, field);			\
133 })
134 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
135 #define ICMP6_INC_STATS(idev, field)		({			\
136 	struct inet6_dev *_idev = (idev);				\
137 	if (likely(_idev != NULL))					\
138 		SNMP_INC_STATS(idev->stats.icmpv6, field); 		\
139 	SNMP_INC_STATS(icmpv6_statistics, field);			\
140 })
141 #define ICMP6_INC_STATS_BH(idev, field)		({			\
142 	struct inet6_dev *_idev = (idev);				\
143 	if (likely(_idev != NULL))					\
144 		SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);	\
145 	SNMP_INC_STATS_BH(icmpv6_statistics, field);			\
146 })
147 #define ICMP6_INC_STATS_USER(idev, field) 	({			\
148 	struct inet6_dev *_idev = (idev);				\
149 	if (likely(_idev != NULL))					\
150 		SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);	\
151 	SNMP_INC_STATS_USER(icmpv6_statistics, field);			\
152 })
153 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)	({			\
154 	struct inet6_dev *_idev = idev;						\
155 	__typeof__(offset) _offset = (offset);					\
156 	if (likely(_idev != NULL))						\
157 		SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);	\
158 	SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);    	\
159 })
160 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
161 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
162 #define UDP6_INC_STATS_BH(field, is_udplite) 			      do  {  \
163 	if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field);         \
164 	else		SNMP_INC_STATS_BH(udp_stats_in6, field);    } while(0)
165 #define UDP6_INC_STATS_USER(field, is_udplite)			       do {    \
166 	if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field);         \
167 	else		SNMP_INC_STATS_USER(udp_stats_in6, field);    } while(0)
168 
169 struct ip6_ra_chain
170 {
171 	struct ip6_ra_chain	*next;
172 	struct sock		*sk;
173 	int			sel;
174 	void			(*destructor)(struct sock *);
175 };
176 
177 extern struct ip6_ra_chain	*ip6_ra_chain;
178 extern rwlock_t ip6_ra_lock;
179 
180 /*
181    This structure is prepared by protocol, when parsing
182    ancillary data and passed to IPv6.
183  */
184 
185 struct ipv6_txoptions
186 {
187 	/* Length of this structure */
188 	int			tot_len;
189 
190 	/* length of extension headers   */
191 
192 	__u16			opt_flen;	/* after fragment hdr */
193 	__u16			opt_nflen;	/* before fragment hdr */
194 
195 	struct ipv6_opt_hdr	*hopopt;
196 	struct ipv6_opt_hdr	*dst0opt;
197 	struct ipv6_rt_hdr	*srcrt;	/* Routing Header */
198 	struct ipv6_opt_hdr	*dst1opt;
199 
200 	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
201 };
202 
203 struct ip6_flowlabel
204 {
205 	struct ip6_flowlabel	*next;
206 	__be32			label;
207 	atomic_t		users;
208 	struct in6_addr		dst;
209 	struct ipv6_txoptions	*opt;
210 	unsigned long		linger;
211 	u8			share;
212 	u32			owner;
213 	unsigned long		lastuse;
214 	unsigned long		expires;
215 };
216 
217 #define IPV6_FLOWINFO_MASK	__constant_htonl(0x0FFFFFFF)
218 #define IPV6_FLOWLABEL_MASK	__constant_htonl(0x000FFFFF)
219 
220 struct ipv6_fl_socklist
221 {
222 	struct ipv6_fl_socklist	*next;
223 	struct ip6_flowlabel	*fl;
224 };
225 
226 extern struct ip6_flowlabel	*fl6_sock_lookup(struct sock *sk, __be32 label);
227 extern struct ipv6_txoptions	*fl6_merge_options(struct ipv6_txoptions * opt_space,
228 						   struct ip6_flowlabel * fl,
229 						   struct ipv6_txoptions * fopt);
230 extern void			fl6_free_socklist(struct sock *sk);
231 extern int			ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
232 extern void			ip6_flowlabel_init(void);
233 extern void			ip6_flowlabel_cleanup(void);
234 
235 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
236 {
237 	if (fl)
238 		atomic_dec(&fl->users);
239 }
240 
241 extern int 			ip6_ra_control(struct sock *sk, int sel,
242 					       void (*destructor)(struct sock *));
243 
244 
245 extern int			ipv6_parse_hopopts(struct sk_buff **skbp);
246 
247 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
248 extern struct ipv6_txoptions *	ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
249 						   int newtype,
250 						   struct ipv6_opt_hdr __user *newopt,
251 						   int newoptlen);
252 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
253 					  struct ipv6_txoptions *opt);
254 
255 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
256 
257 extern int ip6_frag_nqueues;
258 extern atomic_t ip6_frag_mem;
259 
260 #define IPV6_FRAG_TIMEOUT	(60*HZ)		/* 60 seconds */
261 
262 /*
263  *	Function prototype for build_xmit
264  */
265 
266 typedef int		(*inet_getfrag_t) (const void *data,
267 					   struct in6_addr *addr,
268 					   char *,
269 					   unsigned int, unsigned int);
270 
271 extern int __ipv6_addr_type(const struct in6_addr *addr);
272 static inline int ipv6_addr_type(const struct in6_addr *addr)
273 {
274 	return __ipv6_addr_type(addr) & 0xffff;
275 }
276 
277 static inline int ipv6_addr_scope(const struct in6_addr *addr)
278 {
279 	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
280 }
281 
282 static inline int __ipv6_addr_src_scope(int type)
283 {
284 	return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
285 }
286 
287 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
288 {
289 	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
290 }
291 
292 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
293 {
294 	return memcmp(a1, a2, sizeof(struct in6_addr));
295 }
296 
297 static inline int
298 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
299 		     const struct in6_addr *a2)
300 {
301 	unsigned int i;
302 
303 	for (i = 0; i < 4; i++)
304 		if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
305 			return 1;
306 	return 0;
307 }
308 
309 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
310 {
311 	memcpy(a1, a2, sizeof(struct in6_addr));
312 }
313 
314 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
315 				    const struct in6_addr *addr,
316 				    int plen)
317 {
318 	/* caller must guarantee 0 <= plen <= 128 */
319 	int o = plen >> 3,
320 	    b = plen & 0x7;
321 
322 	memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
323 	memcpy(pfx->s6_addr, addr, o);
324 	if (b != 0)
325 		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
326 }
327 
328 static inline void ipv6_addr_set(struct in6_addr *addr,
329 				     __be32 w1, __be32 w2,
330 				     __be32 w3, __be32 w4)
331 {
332 	addr->s6_addr32[0] = w1;
333 	addr->s6_addr32[1] = w2;
334 	addr->s6_addr32[2] = w3;
335 	addr->s6_addr32[3] = w4;
336 }
337 
338 static inline int ipv6_addr_equal(const struct in6_addr *a1,
339 				  const struct in6_addr *a2)
340 {
341 	return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
342 		a1->s6_addr32[1] == a2->s6_addr32[1] &&
343 		a1->s6_addr32[2] == a2->s6_addr32[2] &&
344 		a1->s6_addr32[3] == a2->s6_addr32[3]);
345 }
346 
347 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
348 				      unsigned int prefixlen)
349 {
350 	unsigned pdw, pbi;
351 
352 	/* check complete u32 in prefix */
353 	pdw = prefixlen >> 5;
354 	if (pdw && memcmp(a1, a2, pdw << 2))
355 		return 0;
356 
357 	/* check incomplete u32 in prefix */
358 	pbi = prefixlen & 0x1f;
359 	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
360 		return 0;
361 
362 	return 1;
363 }
364 
365 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
366 				    const struct in6_addr *a2,
367 				    unsigned int prefixlen)
368 {
369 	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
370 				   prefixlen);
371 }
372 
373 static inline int ipv6_addr_any(const struct in6_addr *a)
374 {
375 	return ((a->s6_addr32[0] | a->s6_addr32[1] |
376 		 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
377 }
378 
379 /*
380  * find the first different bit between two addresses
381  * length of address must be a multiple of 32bits
382  */
383 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
384 {
385 	const __be32 *a1 = token1, *a2 = token2;
386 	int i;
387 
388 	addrlen >>= 2;
389 
390 	for (i = 0; i < addrlen; i++) {
391 		__be32 xb = a1[i] ^ a2[i];
392 		if (xb)
393 			return i * 32 + 32 - fls(ntohl(xb));
394 	}
395 
396 	/*
397 	 *	we should *never* get to this point since that
398 	 *	would mean the addrs are equal
399 	 *
400 	 *	However, we do get to it 8) And exacly, when
401 	 *	addresses are equal 8)
402 	 *
403 	 *	ip route add 1111::/128 via ...
404 	 *	ip route add 1111::/64 via ...
405 	 *	and we are here.
406 	 *
407 	 *	Ideally, this function should stop comparison
408 	 *	at prefix length. It does not, but it is still OK,
409 	 *	if returned value is greater than prefix length.
410 	 *					--ANK (980803)
411 	 */
412 	return (addrlen << 5);
413 }
414 
415 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
416 {
417 	return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
418 }
419 
420 /*
421  *	Prototypes exported by ipv6
422  */
423 
424 /*
425  *	rcv function (called from netdevice level)
426  */
427 
428 extern int			ipv6_rcv(struct sk_buff *skb,
429 					 struct net_device *dev,
430 					 struct packet_type *pt,
431 					 struct net_device *orig_dev);
432 
433 extern int			ip6_rcv_finish(struct sk_buff *skb);
434 
435 /*
436  *	upper-layer output functions
437  */
438 extern int			ip6_xmit(struct sock *sk,
439 					 struct sk_buff *skb,
440 					 struct flowi *fl,
441 					 struct ipv6_txoptions *opt,
442 					 int ipfragok);
443 
444 extern int			ip6_nd_hdr(struct sock *sk,
445 					   struct sk_buff *skb,
446 					   struct net_device *dev,
447 					   struct in6_addr *saddr,
448 					   struct in6_addr *daddr,
449 					   int proto, int len);
450 
451 extern int			ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
452 
453 extern int			ip6_append_data(struct sock *sk,
454 						int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
455 		    				void *from,
456 						int length,
457 						int transhdrlen,
458 		      				int hlimit,
459 		      				int tclass,
460 						struct ipv6_txoptions *opt,
461 						struct flowi *fl,
462 						struct rt6_info *rt,
463 						unsigned int flags);
464 
465 extern int			ip6_push_pending_frames(struct sock *sk);
466 
467 extern void			ip6_flush_pending_frames(struct sock *sk);
468 
469 extern int			ip6_dst_lookup(struct sock *sk,
470 					       struct dst_entry **dst,
471 					       struct flowi *fl);
472 extern int			ip6_sk_dst_lookup(struct sock *sk,
473 						  struct dst_entry **dst,
474 						  struct flowi *fl);
475 
476 /*
477  *	skb processing functions
478  */
479 
480 extern int			ip6_output(struct sk_buff *skb);
481 extern int			ip6_forward(struct sk_buff *skb);
482 extern int			ip6_input(struct sk_buff *skb);
483 extern int			ip6_mc_input(struct sk_buff *skb);
484 
485 /*
486  *	Extension header (options) processing
487  */
488 
489 extern u8 *			ipv6_build_nfrag_opts(struct sk_buff *skb,
490 						      u8 *prev_hdr,
491 						      struct ipv6_txoptions *opt,
492 						      struct in6_addr *daddr,
493 						      u32 jumbolen);
494 extern u8 *			ipv6_build_frag_opts(struct sk_buff *skb,
495 						     u8 *prev_hdr,
496 						     struct ipv6_txoptions *opt);
497 extern void 			ipv6_push_nfrag_opts(struct sk_buff *skb,
498 						     struct ipv6_txoptions *opt,
499 						     u8 *proto,
500 						     struct in6_addr **daddr_p);
501 extern void			ipv6_push_frag_opts(struct sk_buff *skb,
502 						    struct ipv6_txoptions *opt,
503 						    u8 *proto);
504 
505 extern int			ipv6_skip_exthdr(const struct sk_buff *, int start,
506 					         u8 *nexthdrp);
507 
508 extern int 			ipv6_ext_hdr(u8 nexthdr);
509 
510 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
511 
512 extern struct ipv6_txoptions *	ipv6_invert_rthdr(struct sock *sk,
513 						  struct ipv6_rt_hdr *hdr);
514 
515 
516 /*
517  *	socket options (ipv6_sockglue.c)
518  */
519 
520 extern int			ipv6_setsockopt(struct sock *sk, int level,
521 						int optname,
522 						char __user *optval,
523 						int optlen);
524 extern int			ipv6_getsockopt(struct sock *sk, int level,
525 						int optname,
526 						char __user *optval,
527 						int __user *optlen);
528 extern int			compat_ipv6_setsockopt(struct sock *sk,
529 						int level,
530 						int optname,
531 						char __user *optval,
532 						int optlen);
533 extern int			compat_ipv6_getsockopt(struct sock *sk,
534 						int level,
535 						int optname,
536 						char __user *optval,
537 						int __user *optlen);
538 
539 extern void			ipv6_packet_init(void);
540 
541 extern void			ipv6_packet_cleanup(void);
542 
543 extern int			ip6_datagram_connect(struct sock *sk,
544 						     struct sockaddr *addr, int addr_len);
545 
546 extern int 			ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
547 extern void			ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
548 						u32 info, u8 *payload);
549 extern void			ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
550 
551 extern int inet6_release(struct socket *sock);
552 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
553 		      int addr_len);
554 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
555 			 int *uaddr_len, int peer);
556 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
557 		       unsigned long arg);
558 
559 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
560 			      struct sock *sk);
561 
562 /*
563  * reassembly.c
564  */
565 extern int sysctl_ip6frag_high_thresh;
566 extern int sysctl_ip6frag_low_thresh;
567 extern int sysctl_ip6frag_time;
568 extern int sysctl_ip6frag_secret_interval;
569 
570 extern const struct proto_ops inet6_stream_ops;
571 extern const struct proto_ops inet6_dgram_ops;
572 
573 struct group_source_req;
574 struct group_filter;
575 
576 extern int ip6_mc_source(int add, int omode, struct sock *sk,
577 			 struct group_source_req *pgsr);
578 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
579 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
580 			 struct group_filter __user *optval,
581 			 int __user *optlen);
582 
583 #ifdef CONFIG_PROC_FS
584 extern int  ac6_proc_init(void);
585 extern void ac6_proc_exit(void);
586 extern int  raw6_proc_init(void);
587 extern void raw6_proc_exit(void);
588 extern int  tcp6_proc_init(void);
589 extern void tcp6_proc_exit(void);
590 extern int  udp6_proc_init(void);
591 extern void udp6_proc_exit(void);
592 extern int  udplite6_proc_init(void);
593 extern void udplite6_proc_exit(void);
594 extern int  ipv6_misc_proc_init(void);
595 extern void ipv6_misc_proc_exit(void);
596 extern int snmp6_register_dev(struct inet6_dev *idev);
597 extern int snmp6_unregister_dev(struct inet6_dev *idev);
598 
599 extern struct rt6_statistics rt6_stats;
600 #else
601 static inline int snmp6_register_dev(struct inet6_dev *idev)
602 {
603 	return 0;
604 }
605 
606 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
607 {
608 	return 0;
609 }
610 #endif
611 
612 #ifdef CONFIG_SYSCTL
613 extern ctl_table ipv6_route_table[];
614 extern ctl_table ipv6_icmp_table[];
615 
616 extern void ipv6_sysctl_register(void);
617 extern void ipv6_sysctl_unregister(void);
618 #endif
619 
620 #endif /* __KERNEL__ */
621 #endif /* _NET_IPV6_H */
622