xref: /openbmc/linux/include/net/ipv6.h (revision 05bcf503)
1 /*
2  *	Linux INET6 implementation
3  *
4  *	Authors:
5  *	Pedro Roque		<roque@di.fc.ul.pt>
6  *
7  *	This program is free software; you can redistribute it and/or
8  *      modify it under the terms of the GNU General Public License
9  *      as published by the Free Software Foundation; either version
10  *      2 of the License, or (at your option) any later version.
11  */
12 
13 #ifndef _NET_IPV6_H
14 #define _NET_IPV6_H
15 
16 #include <linux/ipv6.h>
17 #include <linux/hardirq.h>
18 #include <net/if_inet6.h>
19 #include <net/ndisc.h>
20 #include <net/flow.h>
21 #include <net/snmp.h>
22 
23 #define SIN6_LEN_RFC2133	24
24 
25 #define IPV6_MAXPLEN		65535
26 
27 /*
28  *	NextHeader field of IPv6 header
29  */
30 
31 #define NEXTHDR_HOP		0	/* Hop-by-hop option header. */
32 #define NEXTHDR_TCP		6	/* TCP segment. */
33 #define NEXTHDR_UDP		17	/* UDP message. */
34 #define NEXTHDR_IPV6		41	/* IPv6 in IPv6 */
35 #define NEXTHDR_ROUTING		43	/* Routing header. */
36 #define NEXTHDR_FRAGMENT	44	/* Fragmentation/reassembly header. */
37 #define NEXTHDR_GRE		47	/* GRE 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 
78 /*
79  *	Addr scopes
80  */
81 #define IPV6_ADDR_MC_SCOPE(a)	\
82 	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
83 #define __IPV6_ADDR_SCOPE_INVALID	-1
84 #define IPV6_ADDR_SCOPE_NODELOCAL	0x01
85 #define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
86 #define IPV6_ADDR_SCOPE_SITELOCAL	0x05
87 #define IPV6_ADDR_SCOPE_ORGLOCAL	0x08
88 #define IPV6_ADDR_SCOPE_GLOBAL		0x0e
89 
90 /*
91  *	Addr flags
92  */
93 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a)	\
94 	((a)->s6_addr[1] & 0x10)
95 #define IPV6_ADDR_MC_FLAG_PREFIX(a)	\
96 	((a)->s6_addr[1] & 0x20)
97 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a)	\
98 	((a)->s6_addr[1] & 0x40)
99 
100 /*
101  *	fragmentation header
102  */
103 
104 struct frag_hdr {
105 	__u8	nexthdr;
106 	__u8	reserved;
107 	__be16	frag_off;
108 	__be32	identification;
109 };
110 
111 #define	IP6_MF	0x0001
112 
113 #include <net/sock.h>
114 
115 /* sysctls */
116 extern int sysctl_mld_max_msf;
117 
118 #define _DEVINC(net, statname, modifier, idev, field)			\
119 ({									\
120 	struct inet6_dev *_idev = (idev);				\
121 	if (likely(_idev != NULL))					\
122 		SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
123 	SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
124 })
125 
126 /* per device counters are atomic_long_t */
127 #define _DEVINCATOMIC(net, statname, modifier, idev, field)		\
128 ({									\
129 	struct inet6_dev *_idev = (idev);				\
130 	if (likely(_idev != NULL))					\
131 		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
132 	SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133 })
134 
135 /* per device and per net counters are atomic_long_t */
136 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)		\
137 ({									\
138 	struct inet6_dev *_idev = (idev);				\
139 	if (likely(_idev != NULL))					\
140 		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
141 	SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
142 })
143 
144 #define _DEVADD(net, statname, modifier, idev, field, val)		\
145 ({									\
146 	struct inet6_dev *_idev = (idev);				\
147 	if (likely(_idev != NULL))					\
148 		SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
149 	SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
150 })
151 
152 #define _DEVUPD(net, statname, modifier, idev, field, val)		\
153 ({									\
154 	struct inet6_dev *_idev = (idev);				\
155 	if (likely(_idev != NULL))					\
156 		SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
157 	SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
158 })
159 
160 /* MIBs */
161 
162 #define IP6_INC_STATS(net, idev,field)		\
163 		_DEVINC(net, ipv6, 64, idev, field)
164 #define IP6_INC_STATS_BH(net, idev,field)	\
165 		_DEVINC(net, ipv6, 64_BH, idev, field)
166 #define IP6_ADD_STATS(net, idev,field,val)	\
167 		_DEVADD(net, ipv6, 64, idev, field, val)
168 #define IP6_ADD_STATS_BH(net, idev,field,val)	\
169 		_DEVADD(net, ipv6, 64_BH, idev, field, val)
170 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
171 		_DEVUPD(net, ipv6, 64, idev, field, val)
172 #define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
173 		_DEVUPD(net, ipv6, 64_BH, idev, field, val)
174 #define ICMP6_INC_STATS(net, idev, field)	\
175 		_DEVINCATOMIC(net, icmpv6, , idev, field)
176 #define ICMP6_INC_STATS_BH(net, idev, field)	\
177 		_DEVINCATOMIC(net, icmpv6, _BH, idev, field)
178 
179 #define ICMP6MSGOUT_INC_STATS(net, idev, field)		\
180 	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
181 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)	\
182 	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
183 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field)	\
184 	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
185 
186 struct ip6_ra_chain {
187 	struct ip6_ra_chain	*next;
188 	struct sock		*sk;
189 	int			sel;
190 	void			(*destructor)(struct sock *);
191 };
192 
193 extern struct ip6_ra_chain	*ip6_ra_chain;
194 extern rwlock_t ip6_ra_lock;
195 
196 /*
197    This structure is prepared by protocol, when parsing
198    ancillary data and passed to IPv6.
199  */
200 
201 struct ipv6_txoptions {
202 	/* Length of this structure */
203 	int			tot_len;
204 
205 	/* length of extension headers   */
206 
207 	__u16			opt_flen;	/* after fragment hdr */
208 	__u16			opt_nflen;	/* before fragment hdr */
209 
210 	struct ipv6_opt_hdr	*hopopt;
211 	struct ipv6_opt_hdr	*dst0opt;
212 	struct ipv6_rt_hdr	*srcrt;	/* Routing Header */
213 	struct ipv6_opt_hdr	*dst1opt;
214 
215 	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
216 };
217 
218 struct ip6_flowlabel {
219 	struct ip6_flowlabel	*next;
220 	__be32			label;
221 	atomic_t		users;
222 	struct in6_addr		dst;
223 	struct ipv6_txoptions	*opt;
224 	unsigned long		linger;
225 	u8			share;
226 	union {
227 		struct pid *pid;
228 		kuid_t uid;
229 	} owner;
230 	unsigned long		lastuse;
231 	unsigned long		expires;
232 	struct net		*fl_net;
233 };
234 
235 #define IPV6_FLOWINFO_MASK	cpu_to_be32(0x0FFFFFFF)
236 #define IPV6_FLOWLABEL_MASK	cpu_to_be32(0x000FFFFF)
237 
238 struct ipv6_fl_socklist {
239 	struct ipv6_fl_socklist	*next;
240 	struct ip6_flowlabel	*fl;
241 };
242 
243 extern struct ip6_flowlabel	*fl6_sock_lookup(struct sock *sk, __be32 label);
244 extern struct ipv6_txoptions	*fl6_merge_options(struct ipv6_txoptions * opt_space,
245 						   struct ip6_flowlabel * fl,
246 						   struct ipv6_txoptions * fopt);
247 extern void			fl6_free_socklist(struct sock *sk);
248 extern int			ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
249 extern int			ip6_flowlabel_init(void);
250 extern void			ip6_flowlabel_cleanup(void);
251 
252 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
253 {
254 	if (fl)
255 		atomic_dec(&fl->users);
256 }
257 
258 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
259 
260 extern int 			ip6_ra_control(struct sock *sk, int sel);
261 
262 extern int			ipv6_parse_hopopts(struct sk_buff *skb);
263 
264 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
265 extern struct ipv6_txoptions *	ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
266 						   int newtype,
267 						   struct ipv6_opt_hdr __user *newopt,
268 						   int newoptlen);
269 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
270 					  struct ipv6_txoptions *opt);
271 
272 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
273 
274 #if IS_ENABLED(CONFIG_IPV6)
275 static inline int ip6_frag_nqueues(struct net *net)
276 {
277 	return net->ipv6.frags.nqueues;
278 }
279 
280 static inline int ip6_frag_mem(struct net *net)
281 {
282 	return atomic_read(&net->ipv6.frags.mem);
283 }
284 #endif
285 
286 #define IPV6_FRAG_HIGH_THRESH	(256 * 1024)	/* 262144 */
287 #define IPV6_FRAG_LOW_THRESH	(192 * 1024)	/* 196608 */
288 #define IPV6_FRAG_TIMEOUT	(60 * HZ)	/* 60 seconds */
289 
290 extern int __ipv6_addr_type(const struct in6_addr *addr);
291 static inline int ipv6_addr_type(const struct in6_addr *addr)
292 {
293 	return __ipv6_addr_type(addr) & 0xffff;
294 }
295 
296 static inline int ipv6_addr_scope(const struct in6_addr *addr)
297 {
298 	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
299 }
300 
301 static inline int __ipv6_addr_src_scope(int type)
302 {
303 	return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
304 }
305 
306 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
307 {
308 	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
309 }
310 
311 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
312 {
313 	return memcmp(a1, a2, sizeof(struct in6_addr));
314 }
315 
316 static inline bool
317 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
318 		     const struct in6_addr *a2)
319 {
320 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
321 	const unsigned long *ul1 = (const unsigned long *)a1;
322 	const unsigned long *ulm = (const unsigned long *)m;
323 	const unsigned long *ul2 = (const unsigned long *)a2;
324 
325 	return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
326 		  ((ul1[1] ^ ul2[1]) & ulm[1]));
327 #else
328 	return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
329 		  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
330 		  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
331 		  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
332 #endif
333 }
334 
335 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
336 				    const struct in6_addr *addr,
337 				    int plen)
338 {
339 	/* caller must guarantee 0 <= plen <= 128 */
340 	int o = plen >> 3,
341 	    b = plen & 0x7;
342 
343 	memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
344 	memcpy(pfx->s6_addr, addr, o);
345 	if (b != 0)
346 		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
347 }
348 
349 static inline void ipv6_addr_set(struct in6_addr *addr,
350 				     __be32 w1, __be32 w2,
351 				     __be32 w3, __be32 w4)
352 {
353 	addr->s6_addr32[0] = w1;
354 	addr->s6_addr32[1] = w2;
355 	addr->s6_addr32[2] = w3;
356 	addr->s6_addr32[3] = w4;
357 }
358 
359 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
360 				   const struct in6_addr *a2)
361 {
362 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
363 	const unsigned long *ul1 = (const unsigned long *)a1;
364 	const unsigned long *ul2 = (const unsigned long *)a2;
365 
366 	return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
367 #else
368 	return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
369 		(a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
370 		(a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
371 		(a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
372 #endif
373 }
374 
375 static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
376 				       unsigned int prefixlen)
377 {
378 	unsigned int pdw, pbi;
379 
380 	/* check complete u32 in prefix */
381 	pdw = prefixlen >> 5;
382 	if (pdw && memcmp(a1, a2, pdw << 2))
383 		return false;
384 
385 	/* check incomplete u32 in prefix */
386 	pbi = prefixlen & 0x1f;
387 	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
388 		return false;
389 
390 	return true;
391 }
392 
393 static inline bool ipv6_prefix_equal(const struct in6_addr *a1,
394 				     const struct in6_addr *a2,
395 				     unsigned int prefixlen)
396 {
397 	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
398 				   prefixlen);
399 }
400 
401 struct inet_frag_queue;
402 
403 enum ip6_defrag_users {
404 	IP6_DEFRAG_LOCAL_DELIVER,
405 	IP6_DEFRAG_CONNTRACK_IN,
406 	__IP6_DEFRAG_CONNTRACK_IN	= IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
407 	IP6_DEFRAG_CONNTRACK_OUT,
408 	__IP6_DEFRAG_CONNTRACK_OUT	= IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
409 	IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
410 	__IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
411 };
412 
413 struct ip6_create_arg {
414 	__be32 id;
415 	u32 user;
416 	const struct in6_addr *src;
417 	const struct in6_addr *dst;
418 };
419 
420 void ip6_frag_init(struct inet_frag_queue *q, void *a);
421 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
422 
423 /*
424  *	Equivalent of ipv4 struct ip
425  */
426 struct frag_queue {
427 	struct inet_frag_queue	q;
428 
429 	__be32			id;		/* fragment id		*/
430 	u32			user;
431 	struct in6_addr		saddr;
432 	struct in6_addr		daddr;
433 
434 	int			iif;
435 	unsigned int		csum;
436 	__u16			nhoffset;
437 };
438 
439 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
440 			   struct inet_frags *frags);
441 
442 static inline bool ipv6_addr_any(const struct in6_addr *a)
443 {
444 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
445 	const unsigned long *ul = (const unsigned long *)a;
446 
447 	return (ul[0] | ul[1]) == 0UL;
448 #else
449 	return (a->s6_addr32[0] | a->s6_addr32[1] |
450 		a->s6_addr32[2] | a->s6_addr32[3]) == 0;
451 #endif
452 }
453 
454 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
455 {
456 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
457 	const unsigned long *ul = (const unsigned long *)a;
458 	unsigned long x = ul[0] ^ ul[1];
459 
460 	return (u32)(x ^ (x >> 32));
461 #else
462 	return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
463 			     a->s6_addr32[2] ^ a->s6_addr32[3]);
464 #endif
465 }
466 
467 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
468 {
469 	return (a->s6_addr32[0] | a->s6_addr32[1] |
470 		a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
471 }
472 
473 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
474 {
475 	return (a->s6_addr32[0] | a->s6_addr32[1] |
476 		 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
477 }
478 
479 /*
480  * Check for a RFC 4843 ORCHID address
481  * (Overlay Routable Cryptographic Hash Identifiers)
482  */
483 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
484 {
485 	return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
486 }
487 
488 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
489 					  struct in6_addr *v4mapped)
490 {
491 	ipv6_addr_set(v4mapped,
492 			0, 0,
493 			htonl(0x0000FFFF),
494 			addr);
495 }
496 
497 /*
498  * find the first different bit between two addresses
499  * length of address must be a multiple of 32bits
500  */
501 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
502 {
503 	const __be32 *a1 = token1, *a2 = token2;
504 	int i;
505 
506 	addrlen >>= 2;
507 
508 	for (i = 0; i < addrlen; i++) {
509 		__be32 xb = a1[i] ^ a2[i];
510 		if (xb)
511 			return i * 32 + 31 - __fls(ntohl(xb));
512 	}
513 
514 	/*
515 	 *	we should *never* get to this point since that
516 	 *	would mean the addrs are equal
517 	 *
518 	 *	However, we do get to it 8) And exacly, when
519 	 *	addresses are equal 8)
520 	 *
521 	 *	ip route add 1111::/128 via ...
522 	 *	ip route add 1111::/64 via ...
523 	 *	and we are here.
524 	 *
525 	 *	Ideally, this function should stop comparison
526 	 *	at prefix length. It does not, but it is still OK,
527 	 *	if returned value is greater than prefix length.
528 	 *					--ANK (980803)
529 	 */
530 	return addrlen << 5;
531 }
532 
533 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
534 {
535 	return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
536 }
537 
538 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
539 
540 /*
541  *	Prototypes exported by ipv6
542  */
543 
544 /*
545  *	rcv function (called from netdevice level)
546  */
547 
548 extern int			ipv6_rcv(struct sk_buff *skb,
549 					 struct net_device *dev,
550 					 struct packet_type *pt,
551 					 struct net_device *orig_dev);
552 
553 extern int			ip6_rcv_finish(struct sk_buff *skb);
554 
555 /*
556  *	upper-layer output functions
557  */
558 extern int			ip6_xmit(struct sock *sk,
559 					 struct sk_buff *skb,
560 					 struct flowi6 *fl6,
561 					 struct ipv6_txoptions *opt,
562 					 int tclass);
563 
564 extern int			ip6_nd_hdr(struct sock *sk,
565 					   struct sk_buff *skb,
566 					   struct net_device *dev,
567 					   const struct in6_addr *saddr,
568 					   const struct in6_addr *daddr,
569 					   int proto, int len);
570 
571 extern int			ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
572 
573 extern int			ip6_append_data(struct sock *sk,
574 						int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
575 		    				void *from,
576 						int length,
577 						int transhdrlen,
578 		      				int hlimit,
579 		      				int tclass,
580 						struct ipv6_txoptions *opt,
581 						struct flowi6 *fl6,
582 						struct rt6_info *rt,
583 						unsigned int flags,
584 						int dontfrag);
585 
586 extern int			ip6_push_pending_frames(struct sock *sk);
587 
588 extern void			ip6_flush_pending_frames(struct sock *sk);
589 
590 extern int			ip6_dst_lookup(struct sock *sk,
591 					       struct dst_entry **dst,
592 					       struct flowi6 *fl6);
593 extern struct dst_entry *	ip6_dst_lookup_flow(struct sock *sk,
594 						    struct flowi6 *fl6,
595 						    const struct in6_addr *final_dst,
596 						    bool can_sleep);
597 extern struct dst_entry *	ip6_sk_dst_lookup_flow(struct sock *sk,
598 						       struct flowi6 *fl6,
599 						       const struct in6_addr *final_dst,
600 						       bool can_sleep);
601 extern struct dst_entry *	ip6_blackhole_route(struct net *net,
602 						    struct dst_entry *orig_dst);
603 
604 /*
605  *	skb processing functions
606  */
607 
608 extern int			ip6_output(struct sk_buff *skb);
609 extern int			ip6_forward(struct sk_buff *skb);
610 extern int			ip6_input(struct sk_buff *skb);
611 extern int			ip6_mc_input(struct sk_buff *skb);
612 
613 extern int			__ip6_local_out(struct sk_buff *skb);
614 extern int			ip6_local_out(struct sk_buff *skb);
615 
616 /*
617  *	Extension header (options) processing
618  */
619 
620 extern void 			ipv6_push_nfrag_opts(struct sk_buff *skb,
621 						     struct ipv6_txoptions *opt,
622 						     u8 *proto,
623 						     struct in6_addr **daddr_p);
624 extern void			ipv6_push_frag_opts(struct sk_buff *skb,
625 						    struct ipv6_txoptions *opt,
626 						    u8 *proto);
627 
628 extern int			ipv6_skip_exthdr(const struct sk_buff *, int start,
629 					         u8 *nexthdrp, __be16 *frag_offp);
630 
631 extern bool			ipv6_ext_hdr(u8 nexthdr);
632 
633 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
634 
635 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
636 				       const struct ipv6_txoptions *opt,
637 				       struct in6_addr *orig);
638 
639 /*
640  *	socket options (ipv6_sockglue.c)
641  */
642 
643 extern int			ipv6_setsockopt(struct sock *sk, int level,
644 						int optname,
645 						char __user *optval,
646 						unsigned int optlen);
647 extern int			ipv6_getsockopt(struct sock *sk, int level,
648 						int optname,
649 						char __user *optval,
650 						int __user *optlen);
651 extern int			compat_ipv6_setsockopt(struct sock *sk,
652 						int level,
653 						int optname,
654 						char __user *optval,
655 						unsigned int optlen);
656 extern int			compat_ipv6_getsockopt(struct sock *sk,
657 						int level,
658 						int optname,
659 						char __user *optval,
660 						int __user *optlen);
661 
662 extern int			ip6_datagram_connect(struct sock *sk,
663 						     struct sockaddr *addr, int addr_len);
664 
665 extern int 			ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
666 extern int 			ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
667 extern void			ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
668 						u32 info, u8 *payload);
669 extern void			ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
670 extern void			ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
671 
672 extern int inet6_release(struct socket *sock);
673 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
674 		      int addr_len);
675 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
676 			 int *uaddr_len, int peer);
677 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
678 		       unsigned long arg);
679 
680 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
681 			      struct sock *sk);
682 
683 /*
684  * reassembly.c
685  */
686 extern const struct proto_ops inet6_stream_ops;
687 extern const struct proto_ops inet6_dgram_ops;
688 
689 struct group_source_req;
690 struct group_filter;
691 
692 extern int ip6_mc_source(int add, int omode, struct sock *sk,
693 			 struct group_source_req *pgsr);
694 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
695 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
696 			 struct group_filter __user *optval,
697 			 int __user *optlen);
698 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
699 				    const struct in6_addr *daddr, u32 rnd);
700 
701 #ifdef CONFIG_PROC_FS
702 extern int  ac6_proc_init(struct net *net);
703 extern void ac6_proc_exit(struct net *net);
704 extern int  raw6_proc_init(void);
705 extern void raw6_proc_exit(void);
706 extern int  tcp6_proc_init(struct net *net);
707 extern void tcp6_proc_exit(struct net *net);
708 extern int  udp6_proc_init(struct net *net);
709 extern void udp6_proc_exit(struct net *net);
710 extern int  udplite6_proc_init(void);
711 extern void udplite6_proc_exit(void);
712 extern int  ipv6_misc_proc_init(void);
713 extern void ipv6_misc_proc_exit(void);
714 extern int snmp6_register_dev(struct inet6_dev *idev);
715 extern int snmp6_unregister_dev(struct inet6_dev *idev);
716 
717 #else
718 static inline int ac6_proc_init(struct net *net) { return 0; }
719 static inline void ac6_proc_exit(struct net *net) { }
720 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
721 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
722 #endif
723 
724 #ifdef CONFIG_SYSCTL
725 extern ctl_table ipv6_route_table_template[];
726 extern ctl_table ipv6_icmp_table_template[];
727 
728 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
729 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
730 extern int ipv6_sysctl_register(void);
731 extern void ipv6_sysctl_unregister(void);
732 #endif
733 
734 #endif /* _NET_IPV6_H */
735