xref: /openbmc/linux/include/net/ipv6.h (revision f42b3800)
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/if_inet6.h>
21 #include <net/ndisc.h>
22 #include <net/flow.h>
23 #include <net/snmp.h>
24 
25 #define SIN6_LEN_RFC2133	24
26 
27 #define IPV6_MAXPLEN		65535
28 
29 /*
30  *	NextHeader field of IPv6 header
31  */
32 
33 #define NEXTHDR_HOP		0	/* Hop-by-hop option header. */
34 #define NEXTHDR_TCP		6	/* TCP segment. */
35 #define NEXTHDR_UDP		17	/* UDP message. */
36 #define NEXTHDR_IPV6		41	/* IPv6 in IPv6 */
37 #define NEXTHDR_ROUTING		43	/* Routing header. */
38 #define NEXTHDR_FRAGMENT	44	/* Fragmentation/reassembly header. */
39 #define NEXTHDR_ESP		50	/* Encapsulating security payload. */
40 #define NEXTHDR_AUTH		51	/* Authentication header. */
41 #define NEXTHDR_ICMP		58	/* ICMP for IPv6. */
42 #define NEXTHDR_NONE		59	/* No next header */
43 #define NEXTHDR_DEST		60	/* Destination options header. */
44 #define NEXTHDR_MOBILITY	135	/* Mobility header. */
45 
46 #define NEXTHDR_MAX		255
47 
48 
49 
50 #define IPV6_DEFAULT_HOPLIMIT   64
51 #define IPV6_DEFAULT_MCASTHOPS	1
52 
53 /*
54  *	Addr type
55  *
56  *	type	-	unicast | multicast
57  *	scope	-	local	| site	    | global
58  *	v4	-	compat
59  *	v4mapped
60  *	any
61  *	loopback
62  */
63 
64 #define IPV6_ADDR_ANY		0x0000U
65 
66 #define IPV6_ADDR_UNICAST      	0x0001U
67 #define IPV6_ADDR_MULTICAST    	0x0002U
68 
69 #define IPV6_ADDR_LOOPBACK	0x0010U
70 #define IPV6_ADDR_LINKLOCAL	0x0020U
71 #define IPV6_ADDR_SITELOCAL	0x0040U
72 
73 #define IPV6_ADDR_COMPATv4	0x0080U
74 
75 #define IPV6_ADDR_SCOPE_MASK	0x00f0U
76 
77 #define IPV6_ADDR_MAPPED	0x1000U
78 #define IPV6_ADDR_RESERVED	0x2000U	/* reserved address space */
79 
80 /*
81  *	Addr scopes
82  */
83 #ifdef __KERNEL__
84 #define IPV6_ADDR_MC_SCOPE(a)	\
85 	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
86 #define __IPV6_ADDR_SCOPE_INVALID	-1
87 #endif
88 #define IPV6_ADDR_SCOPE_NODELOCAL	0x01
89 #define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
90 #define IPV6_ADDR_SCOPE_SITELOCAL	0x05
91 #define IPV6_ADDR_SCOPE_ORGLOCAL	0x08
92 #define IPV6_ADDR_SCOPE_GLOBAL		0x0e
93 
94 /*
95  *	fragmentation header
96  */
97 
98 struct frag_hdr {
99 	__u8	nexthdr;
100 	__u8	reserved;
101 	__be16	frag_off;
102 	__be32	identification;
103 };
104 
105 #define	IP6_MF	0x0001
106 
107 #ifdef __KERNEL__
108 
109 #include <net/sock.h>
110 
111 /* sysctls */
112 extern int sysctl_mld_max_msf;
113 extern struct ctl_path net_ipv6_ctl_path[];
114 
115 #define _DEVINC(statname, modifier, idev, field)			\
116 ({									\
117 	struct inet6_dev *_idev = (idev);				\
118 	if (likely(_idev != NULL))					\
119 		SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
120 	SNMP_INC_STATS##modifier(statname##_statistics, (field));	\
121 })
122 
123 #define _DEVADD(statname, modifier, idev, field, val)			\
124 ({									\
125 	struct inet6_dev *_idev = (idev);				\
126 	if (likely(_idev != NULL))					\
127 		SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
128 	SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
129 })
130 
131 /* MIBs */
132 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
133 
134 #define IP6_INC_STATS(idev,field)	_DEVINC(ipv6, , idev, field)
135 #define IP6_INC_STATS_BH(idev,field)	_DEVINC(ipv6, _BH, idev, field)
136 #define IP6_INC_STATS_USER(idev,field)	_DEVINC(ipv6, _USER, idev, field)
137 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
138 
139 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
140 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
141 
142 #define ICMP6_INC_STATS(idev, field)	_DEVINC(icmpv6, , idev, field)
143 #define ICMP6_INC_STATS_BH(idev, field)	_DEVINC(icmpv6, _BH, idev, field)
144 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
145 
146 #define ICMP6MSGOUT_INC_STATS(idev, field) \
147 	_DEVINC(icmpv6msg, , idev, field +256)
148 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
149 	_DEVINC(icmpv6msg, _BH, idev, field +256)
150 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
151 	_DEVINC(icmpv6msg, _USER, idev, field +256)
152 #define ICMP6MSGIN_INC_STATS(idev, field) \
153 	 _DEVINC(icmpv6msg, , idev, field)
154 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
155 	_DEVINC(icmpv6msg, _BH, idev, field)
156 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
157 	_DEVINC(icmpv6msg, _USER, idev, field)
158 
159 struct ip6_ra_chain
160 {
161 	struct ip6_ra_chain	*next;
162 	struct sock		*sk;
163 	int			sel;
164 	void			(*destructor)(struct sock *);
165 };
166 
167 extern struct ip6_ra_chain	*ip6_ra_chain;
168 extern rwlock_t ip6_ra_lock;
169 
170 /*
171    This structure is prepared by protocol, when parsing
172    ancillary data and passed to IPv6.
173  */
174 
175 struct ipv6_txoptions
176 {
177 	/* Length of this structure */
178 	int			tot_len;
179 
180 	/* length of extension headers   */
181 
182 	__u16			opt_flen;	/* after fragment hdr */
183 	__u16			opt_nflen;	/* before fragment hdr */
184 
185 	struct ipv6_opt_hdr	*hopopt;
186 	struct ipv6_opt_hdr	*dst0opt;
187 	struct ipv6_rt_hdr	*srcrt;	/* Routing Header */
188 	struct ipv6_opt_hdr	*dst1opt;
189 
190 	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
191 };
192 
193 struct ip6_flowlabel
194 {
195 	struct ip6_flowlabel	*next;
196 	__be32			label;
197 	atomic_t		users;
198 	struct in6_addr		dst;
199 	struct ipv6_txoptions	*opt;
200 	unsigned long		linger;
201 	u8			share;
202 	u32			owner;
203 	unsigned long		lastuse;
204 	unsigned long		expires;
205 	struct net		*fl_net;
206 };
207 
208 #define IPV6_FLOWINFO_MASK	__constant_htonl(0x0FFFFFFF)
209 #define IPV6_FLOWLABEL_MASK	__constant_htonl(0x000FFFFF)
210 
211 struct ipv6_fl_socklist
212 {
213 	struct ipv6_fl_socklist	*next;
214 	struct ip6_flowlabel	*fl;
215 };
216 
217 extern struct ip6_flowlabel	*fl6_sock_lookup(struct sock *sk, __be32 label);
218 extern struct ipv6_txoptions	*fl6_merge_options(struct ipv6_txoptions * opt_space,
219 						   struct ip6_flowlabel * fl,
220 						   struct ipv6_txoptions * fopt);
221 extern void			fl6_free_socklist(struct sock *sk);
222 extern int			ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
223 extern int			ip6_flowlabel_init(void);
224 extern void			ip6_flowlabel_cleanup(void);
225 
226 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
227 {
228 	if (fl)
229 		atomic_dec(&fl->users);
230 }
231 
232 extern int 			ip6_ra_control(struct sock *sk, int sel,
233 					       void (*destructor)(struct sock *));
234 
235 
236 extern int			ipv6_parse_hopopts(struct sk_buff *skb);
237 
238 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
239 extern struct ipv6_txoptions *	ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
240 						   int newtype,
241 						   struct ipv6_opt_hdr __user *newopt,
242 						   int newoptlen);
243 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
244 					  struct ipv6_txoptions *opt);
245 
246 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
247 
248 int ip6_frag_nqueues(struct net *net);
249 int ip6_frag_mem(struct net *net);
250 
251 #define IPV6_FRAG_TIMEOUT	(60*HZ)		/* 60 seconds */
252 
253 extern int __ipv6_addr_type(const struct in6_addr *addr);
254 static inline int ipv6_addr_type(const struct in6_addr *addr)
255 {
256 	return __ipv6_addr_type(addr) & 0xffff;
257 }
258 
259 static inline int ipv6_addr_scope(const struct in6_addr *addr)
260 {
261 	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
262 }
263 
264 static inline int __ipv6_addr_src_scope(int type)
265 {
266 	return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
267 }
268 
269 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
270 {
271 	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
272 }
273 
274 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
275 {
276 	return memcmp(a1, a2, sizeof(struct in6_addr));
277 }
278 
279 static inline int
280 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
281 		     const struct in6_addr *a2)
282 {
283 	return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
284 		   ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
285 		   ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
286 		   ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
287 }
288 
289 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
290 {
291 	memcpy(a1, a2, sizeof(struct in6_addr));
292 }
293 
294 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
295 				    const struct in6_addr *addr,
296 				    int plen)
297 {
298 	/* caller must guarantee 0 <= plen <= 128 */
299 	int o = plen >> 3,
300 	    b = plen & 0x7;
301 
302 	memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
303 	memcpy(pfx->s6_addr, addr, o);
304 	if (b != 0)
305 		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
306 }
307 
308 static inline void ipv6_addr_set(struct in6_addr *addr,
309 				     __be32 w1, __be32 w2,
310 				     __be32 w3, __be32 w4)
311 {
312 	addr->s6_addr32[0] = w1;
313 	addr->s6_addr32[1] = w2;
314 	addr->s6_addr32[2] = w3;
315 	addr->s6_addr32[3] = w4;
316 }
317 
318 static inline int ipv6_addr_equal(const struct in6_addr *a1,
319 				  const struct in6_addr *a2)
320 {
321 	return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
322 		 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
323 		 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
324 		 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
325 }
326 
327 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
328 				      unsigned int prefixlen)
329 {
330 	unsigned pdw, pbi;
331 
332 	/* check complete u32 in prefix */
333 	pdw = prefixlen >> 5;
334 	if (pdw && memcmp(a1, a2, pdw << 2))
335 		return 0;
336 
337 	/* check incomplete u32 in prefix */
338 	pbi = prefixlen & 0x1f;
339 	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
340 		return 0;
341 
342 	return 1;
343 }
344 
345 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
346 				    const struct in6_addr *a2,
347 				    unsigned int prefixlen)
348 {
349 	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
350 				   prefixlen);
351 }
352 
353 struct inet_frag_queue;
354 
355 struct ip6_create_arg {
356 	__be32 id;
357 	struct in6_addr *src;
358 	struct in6_addr *dst;
359 };
360 
361 void ip6_frag_init(struct inet_frag_queue *q, void *a);
362 int ip6_frag_match(struct inet_frag_queue *q, void *a);
363 
364 static inline int ipv6_addr_any(const struct in6_addr *a)
365 {
366 	return ((a->s6_addr32[0] | a->s6_addr32[1] |
367 		 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
368 }
369 
370 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
371 {
372 	return ((a->s6_addr32[0] | a->s6_addr32[1] |
373 		 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
374 }
375 
376 /*
377  * Check for a RFC 4843 ORCHID address
378  * (Overlay Routable Cryptographic Hash Identifiers)
379  */
380 static inline int ipv6_addr_orchid(const struct in6_addr *a)
381 {
382 	return ((a->s6_addr32[0] & htonl(0xfffffff0))
383 		== htonl(0x20010010));
384 }
385 
386 /*
387  * find the first different bit between two addresses
388  * length of address must be a multiple of 32bits
389  */
390 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
391 {
392 	const __be32 *a1 = token1, *a2 = token2;
393 	int i;
394 
395 	addrlen >>= 2;
396 
397 	for (i = 0; i < addrlen; i++) {
398 		__be32 xb = a1[i] ^ a2[i];
399 		if (xb)
400 			return i * 32 + 32 - fls(ntohl(xb));
401 	}
402 
403 	/*
404 	 *	we should *never* get to this point since that
405 	 *	would mean the addrs are equal
406 	 *
407 	 *	However, we do get to it 8) And exacly, when
408 	 *	addresses are equal 8)
409 	 *
410 	 *	ip route add 1111::/128 via ...
411 	 *	ip route add 1111::/64 via ...
412 	 *	and we are here.
413 	 *
414 	 *	Ideally, this function should stop comparison
415 	 *	at prefix length. It does not, but it is still OK,
416 	 *	if returned value is greater than prefix length.
417 	 *					--ANK (980803)
418 	 */
419 	return (addrlen << 5);
420 }
421 
422 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
423 {
424 	return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
425 }
426 
427 /*
428  *	Prototypes exported by ipv6
429  */
430 
431 /*
432  *	rcv function (called from netdevice level)
433  */
434 
435 extern int			ipv6_rcv(struct sk_buff *skb,
436 					 struct net_device *dev,
437 					 struct packet_type *pt,
438 					 struct net_device *orig_dev);
439 
440 extern int			ip6_rcv_finish(struct sk_buff *skb);
441 
442 /*
443  *	upper-layer output functions
444  */
445 extern int			ip6_xmit(struct sock *sk,
446 					 struct sk_buff *skb,
447 					 struct flowi *fl,
448 					 struct ipv6_txoptions *opt,
449 					 int ipfragok);
450 
451 extern int			ip6_nd_hdr(struct sock *sk,
452 					   struct sk_buff *skb,
453 					   struct net_device *dev,
454 					   const struct in6_addr *saddr,
455 					   const struct in6_addr *daddr,
456 					   int proto, int len);
457 
458 extern int			ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
459 
460 extern int			ip6_append_data(struct sock *sk,
461 						int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
462 		    				void *from,
463 						int length,
464 						int transhdrlen,
465 		      				int hlimit,
466 		      				int tclass,
467 						struct ipv6_txoptions *opt,
468 						struct flowi *fl,
469 						struct rt6_info *rt,
470 						unsigned int flags);
471 
472 extern int			ip6_push_pending_frames(struct sock *sk);
473 
474 extern void			ip6_flush_pending_frames(struct sock *sk);
475 
476 extern int			ip6_dst_lookup(struct sock *sk,
477 					       struct dst_entry **dst,
478 					       struct flowi *fl);
479 extern int			ip6_dst_blackhole(struct sock *sk,
480 						  struct dst_entry **dst,
481 						  struct flowi *fl);
482 extern int			ip6_sk_dst_lookup(struct sock *sk,
483 						  struct dst_entry **dst,
484 						  struct flowi *fl);
485 
486 /*
487  *	skb processing functions
488  */
489 
490 extern int			ip6_output(struct sk_buff *skb);
491 extern int			ip6_forward(struct sk_buff *skb);
492 extern int			ip6_input(struct sk_buff *skb);
493 extern int			ip6_mc_input(struct sk_buff *skb);
494 
495 extern int			__ip6_local_out(struct sk_buff *skb);
496 extern int			ip6_local_out(struct sk_buff *skb);
497 
498 /*
499  *	Extension header (options) processing
500  */
501 
502 extern void 			ipv6_push_nfrag_opts(struct sk_buff *skb,
503 						     struct ipv6_txoptions *opt,
504 						     u8 *proto,
505 						     struct in6_addr **daddr_p);
506 extern void			ipv6_push_frag_opts(struct sk_buff *skb,
507 						    struct ipv6_txoptions *opt,
508 						    u8 *proto);
509 
510 extern int			ipv6_skip_exthdr(const struct sk_buff *, int start,
511 					         u8 *nexthdrp);
512 
513 extern int 			ipv6_ext_hdr(u8 nexthdr);
514 
515 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
516 
517 /*
518  *	socket options (ipv6_sockglue.c)
519  */
520 
521 extern int			ipv6_setsockopt(struct sock *sk, int level,
522 						int optname,
523 						char __user *optval,
524 						int optlen);
525 extern int			ipv6_getsockopt(struct sock *sk, int level,
526 						int optname,
527 						char __user *optval,
528 						int __user *optlen);
529 extern int			compat_ipv6_setsockopt(struct sock *sk,
530 						int level,
531 						int optname,
532 						char __user *optval,
533 						int optlen);
534 extern int			compat_ipv6_getsockopt(struct sock *sk,
535 						int level,
536 						int optname,
537 						char __user *optval,
538 						int __user *optlen);
539 
540 extern int			ip6_datagram_connect(struct sock *sk,
541 						     struct sockaddr *addr, int addr_len);
542 
543 extern int 			ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
544 extern void			ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
545 						u32 info, u8 *payload);
546 extern void			ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
547 
548 extern int inet6_release(struct socket *sock);
549 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
550 		      int addr_len);
551 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
552 			 int *uaddr_len, int peer);
553 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
554 		       unsigned long arg);
555 
556 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
557 			      struct sock *sk);
558 
559 /*
560  * reassembly.c
561  */
562 extern const struct proto_ops inet6_stream_ops;
563 extern const struct proto_ops inet6_dgram_ops;
564 
565 struct group_source_req;
566 struct group_filter;
567 
568 extern int ip6_mc_source(int add, int omode, struct sock *sk,
569 			 struct group_source_req *pgsr);
570 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
571 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
572 			 struct group_filter __user *optval,
573 			 int __user *optlen);
574 
575 #ifdef CONFIG_PROC_FS
576 extern int  ac6_proc_init(struct net *net);
577 extern void ac6_proc_exit(struct net *net);
578 extern int  raw6_proc_init(void);
579 extern void raw6_proc_exit(void);
580 extern int  tcp6_proc_init(struct net *net);
581 extern void tcp6_proc_exit(struct net *net);
582 extern int  udp6_proc_init(struct net *net);
583 extern void udp6_proc_exit(struct net *net);
584 extern int  udplite6_proc_init(void);
585 extern void udplite6_proc_exit(void);
586 extern int  ipv6_misc_proc_init(void);
587 extern void ipv6_misc_proc_exit(void);
588 extern int snmp6_register_dev(struct inet6_dev *idev);
589 extern int snmp6_unregister_dev(struct inet6_dev *idev);
590 
591 #else
592 static inline int ac6_proc_init(struct net *net) { return 0; }
593 static inline void ac6_proc_exit(struct net *net) { }
594 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
595 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
596 #endif
597 
598 #ifdef CONFIG_SYSCTL
599 extern ctl_table ipv6_route_table_template[];
600 extern ctl_table ipv6_icmp_table_template[];
601 
602 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
603 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
604 extern int ipv6_sysctl_register(void);
605 extern void ipv6_sysctl_unregister(void);
606 #endif
607 
608 #endif /* __KERNEL__ */
609 #endif /* _NET_IPV6_H */
610