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tmpfs: move swap_state stats update
[linux-2.6/openmoko-kernel/knife-kernel.git] / include / net / ipv6.h
blobfa80ea48639dd30002bfeaac4200eaef4bce7faf
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
114 extern struct ctl_path net_ipv6_ctl_path[];
115
116 #define _DEVINC(statname, modifier, idev, field) \
117 ({ \
118 struct inet6_dev *_idev = (idev); \
119 if (likely(_idev != NULL)) \
120 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
121 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \
122 })
123
124 #define _DEVADD(statname, modifier, idev, field, val) \
125 ({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
129 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
130 })
131
132 /* MIBs */
133 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
134
135 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
136 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
137 #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field)
138 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
139
140 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
141 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
142
143 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
144 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
145 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
146
147 #define ICMP6MSGOUT_INC_STATS(idev, field) \
148 _DEVINC(icmpv6msg, , idev, field +256)
149 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
150 _DEVINC(icmpv6msg, _BH, idev, field +256)
151 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
152 _DEVINC(icmpv6msg, _USER, idev, field +256)
153 #define ICMP6MSGIN_INC_STATS(idev, field) \
154 _DEVINC(icmpv6msg, , idev, field)
155 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
156 _DEVINC(icmpv6msg, _BH, idev, field)
157 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
158 _DEVINC(icmpv6msg, _USER, idev, field)
159
160 struct ip6_ra_chain
161 {
162 struct ip6_ra_chain *next;
163 struct sock *sk;
164 int sel;
165 void (*destructor)(struct sock *);
166 };
167
168 extern struct ip6_ra_chain *ip6_ra_chain;
169 extern rwlock_t ip6_ra_lock;
170
171 /*
172 This structure is prepared by protocol, when parsing
173 ancillary data and passed to IPv6.
174 */
175
176 struct ipv6_txoptions
177 {
178 /* Length of this structure */
179 int tot_len;
180
181 /* length of extension headers */
182
183 __u16 opt_flen; /* after fragment hdr */
184 __u16 opt_nflen; /* before fragment hdr */
185
186 struct ipv6_opt_hdr *hopopt;
187 struct ipv6_opt_hdr *dst0opt;
188 struct ipv6_rt_hdr *srcrt; /* Routing Header */
189 struct ipv6_opt_hdr *dst1opt;
190
191 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
192 };
193
194 struct ip6_flowlabel
195 {
196 struct ip6_flowlabel *next;
197 __be32 label;
198 atomic_t users;
199 struct in6_addr dst;
200 struct ipv6_txoptions *opt;
201 unsigned long linger;
202 u8 share;
203 u32 owner;
204 unsigned long lastuse;
205 unsigned long expires;
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 /*
254 * Function prototype for build_xmit
255 */
256
257 typedef int (*inet_getfrag_t) (const void *data,
258 struct in6_addr *addr,
259 char *,
260 unsigned int, unsigned int);
261
262 extern int __ipv6_addr_type(const struct in6_addr *addr);
263 static inline int ipv6_addr_type(const struct in6_addr *addr)
264 {
265 return __ipv6_addr_type(addr) & 0xffff;
266 }
267
268 static inline int ipv6_addr_scope(const struct in6_addr *addr)
269 {
270 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
271 }
272
273 static inline int __ipv6_addr_src_scope(int type)
274 {
275 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
276 }
277
278 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
279 {
280 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
281 }
282
283 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
284 {
285 return memcmp(a1, a2, sizeof(struct in6_addr));
286 }
287
288 static inline int
289 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
290 const struct in6_addr *a2)
291 {
292 unsigned int i;
293
294 for (i = 0; i < 4; i++)
295 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
296 return 1;
297 return 0;
298 }
299
300 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
301 {
302 memcpy(a1, a2, sizeof(struct in6_addr));
303 }
304
305 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
306 const struct in6_addr *addr,
307 int plen)
308 {
309 /* caller must guarantee 0 <= plen <= 128 */
310 int o = plen >> 3,
311 b = plen & 0x7;
312
313 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
314 memcpy(pfx->s6_addr, addr, o);
315 if (b != 0)
316 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
317 }
318
319 static inline void ipv6_addr_set(struct in6_addr *addr,
320 __be32 w1, __be32 w2,
321 __be32 w3, __be32 w4)
322 {
323 addr->s6_addr32[0] = w1;
324 addr->s6_addr32[1] = w2;
325 addr->s6_addr32[2] = w3;
326 addr->s6_addr32[3] = w4;
327 }
328
329 static inline int ipv6_addr_equal(const struct in6_addr *a1,
330 const struct in6_addr *a2)
331 {
332 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
333 a1->s6_addr32[1] == a2->s6_addr32[1] &&
334 a1->s6_addr32[2] == a2->s6_addr32[2] &&
335 a1->s6_addr32[3] == a2->s6_addr32[3]);
336 }
337
338 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
339 unsigned int prefixlen)
340 {
341 unsigned pdw, pbi;
342
343 /* check complete u32 in prefix */
344 pdw = prefixlen >> 5;
345 if (pdw && memcmp(a1, a2, pdw << 2))
346 return 0;
347
348 /* check incomplete u32 in prefix */
349 pbi = prefixlen & 0x1f;
350 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
351 return 0;
352
353 return 1;
354 }
355
356 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
357 const struct in6_addr *a2,
358 unsigned int prefixlen)
359 {
360 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
361 prefixlen);
362 }
363
364 struct inet_frag_queue;
365
366 struct ip6_create_arg {
367 __be32 id;
368 struct in6_addr *src;
369 struct in6_addr *dst;
370 };
371
372 void ip6_frag_init(struct inet_frag_queue *q, void *a);
373 int ip6_frag_match(struct inet_frag_queue *q, void *a);
374
375 static inline int ipv6_addr_any(const struct in6_addr *a)
376 {
377 return ((a->s6_addr32[0] | a->s6_addr32[1] |
378 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
379 }
380
381 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
382 {
383 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
384 a->s6_addr32[2] == htonl(0x0000ffff));
385 }
386
387 /*
388 * find the first different bit between two addresses
389 * length of address must be a multiple of 32bits
390 */
391 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
392 {
393 const __be32 *a1 = token1, *a2 = token2;
394 int i;
395
396 addrlen >>= 2;
397
398 for (i = 0; i < addrlen; i++) {
399 __be32 xb = a1[i] ^ a2[i];
400 if (xb)
401 return i * 32 + 32 - fls(ntohl(xb));
402 }
403
404 /*
405 * we should *never* get to this point since that
406 * would mean the addrs are equal
407 *
408 * However, we do get to it 8) And exacly, when
409 * addresses are equal 8)
410 *
411 * ip route add 1111::/128 via ...
412 * ip route add 1111::/64 via ...
413 * and we are here.
414 *
415 * Ideally, this function should stop comparison
416 * at prefix length. It does not, but it is still OK,
417 * if returned value is greater than prefix length.
418 * --ANK (980803)
419 */
420 return (addrlen << 5);
421 }
422
423 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
424 {
425 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
426 }
427
428 /*
429 * Prototypes exported by ipv6
430 */
431
432 /*
433 * rcv function (called from netdevice level)
434 */
435
436 extern int ipv6_rcv(struct sk_buff *skb,
437 struct net_device *dev,
438 struct packet_type *pt,
439 struct net_device *orig_dev);
440
441 extern int ip6_rcv_finish(struct sk_buff *skb);
442
443 /*
444 * upper-layer output functions
445 */
446 extern int ip6_xmit(struct sock *sk,
447 struct sk_buff *skb,
448 struct flowi *fl,
449 struct ipv6_txoptions *opt,
450 int ipfragok);
451
452 extern int ip6_nd_hdr(struct sock *sk,
453 struct sk_buff *skb,
454 struct net_device *dev,
455 struct in6_addr *saddr,
456 struct in6_addr *daddr,
457 int proto, int len);
458
459 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
460
461 extern int ip6_append_data(struct sock *sk,
462 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
463 void *from,
464 int length,
465 int transhdrlen,
466 int hlimit,
467 int tclass,
468 struct ipv6_txoptions *opt,
469 struct flowi *fl,
470 struct rt6_info *rt,
471 unsigned int flags);
472
473 extern int ip6_push_pending_frames(struct sock *sk);
474
475 extern void ip6_flush_pending_frames(struct sock *sk);
476
477 extern int ip6_dst_lookup(struct sock *sk,
478 struct dst_entry **dst,
479 struct flowi *fl);
480 extern int ip6_dst_blackhole(struct sock *sk,
481 struct dst_entry **dst,
482 struct flowi *fl);
483 extern int ip6_sk_dst_lookup(struct sock *sk,
484 struct dst_entry **dst,
485 struct flowi *fl);
486
487 /*
488 * skb processing functions
489 */
490
491 extern int ip6_output(struct sk_buff *skb);
492 extern int ip6_forward(struct sk_buff *skb);
493 extern int ip6_input(struct sk_buff *skb);
494 extern int ip6_mc_input(struct sk_buff *skb);
495
496 extern int __ip6_local_out(struct sk_buff *skb);
497 extern int ip6_local_out(struct sk_buff *skb);
498
499 /*
500 * Extension header (options) processing
501 */
502
503 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
504 u8 *prev_hdr,
505 struct ipv6_txoptions *opt,
506 struct in6_addr *daddr,
507 u32 jumbolen);
508 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
509 u8 *prev_hdr,
510 struct ipv6_txoptions *opt);
511 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
512 struct ipv6_txoptions *opt,
513 u8 *proto,
514 struct in6_addr **daddr_p);
515 extern void ipv6_push_frag_opts(struct sk_buff *skb,
516 struct ipv6_txoptions *opt,
517 u8 *proto);
518
519 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
520 u8 *nexthdrp);
521
522 extern int ipv6_ext_hdr(u8 nexthdr);
523
524 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
525
526 /*
527 * socket options (ipv6_sockglue.c)
528 */
529
530 extern int ipv6_setsockopt(struct sock *sk, int level,
531 int optname,
532 char __user *optval,
533 int optlen);
534 extern int ipv6_getsockopt(struct sock *sk, int level,
535 int optname,
536 char __user *optval,
537 int __user *optlen);
538 extern int compat_ipv6_setsockopt(struct sock *sk,
539 int level,
540 int optname,
541 char __user *optval,
542 int optlen);
543 extern int compat_ipv6_getsockopt(struct sock *sk,
544 int level,
545 int optname,
546 char __user *optval,
547 int __user *optlen);
548
549 extern int ipv6_packet_init(void);
550
551 extern void ipv6_packet_cleanup(void);
552
553 extern int ip6_datagram_connect(struct sock *sk,
554 struct sockaddr *addr, int addr_len);
555
556 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
557 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
558 u32 info, u8 *payload);
559 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
560
561 extern int inet6_release(struct socket *sock);
562 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
563 int addr_len);
564 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
565 int *uaddr_len, int peer);
566 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
567 unsigned long arg);
568
569 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
570 struct sock *sk);
571
572 /*
573 * reassembly.c
574 */
575 extern const struct proto_ops inet6_stream_ops;
576 extern const struct proto_ops inet6_dgram_ops;
577
578 struct group_source_req;
579 struct group_filter;
580
581 extern int ip6_mc_source(int add, int omode, struct sock *sk,
582 struct group_source_req *pgsr);
583 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
584 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
585 struct group_filter __user *optval,
586 int __user *optlen);
587
588 #ifdef CONFIG_PROC_FS
589 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
590 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
591
592 extern int ac6_proc_init(void);
593 extern void ac6_proc_exit(void);
594 extern int raw6_proc_init(void);
595 extern void raw6_proc_exit(void);
596 extern int tcp6_proc_init(void);
597 extern void tcp6_proc_exit(void);
598 extern int udp6_proc_init(void);
599 extern void udp6_proc_exit(void);
600 extern int udplite6_proc_init(void);
601 extern void udplite6_proc_exit(void);
602 extern int ipv6_misc_proc_init(void);
603 extern void ipv6_misc_proc_exit(void);
604 extern int snmp6_register_dev(struct inet6_dev *idev);
605 extern int snmp6_unregister_dev(struct inet6_dev *idev);
606
607 extern struct rt6_statistics rt6_stats;
608 #else
609 static inline int snmp6_register_dev(struct inet6_dev *idev)
610 {
611 return 0;
612 }
613
614 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
615 {
616 return 0;
617 }
618 #endif
619
620 #ifdef CONFIG_SYSCTL
621 extern ctl_table ipv6_route_table_template[];
622 extern ctl_table ipv6_icmp_table_template[];
623
624 extern int ipv6_sysctl_register(void);
625 extern void ipv6_sysctl_unregister(void);
626 #endif
627
628 #endif /* __KERNEL__ */
629 #endif /* _NET_IPV6_H */
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