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pata_bf54x: decrease count first.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / net / ipv6.h
blobe0a612bc9c4ef8f5bdb1a3b70a1685b153ca38fa
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 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
387 struct in6_addr *v4mapped)
388 {
389 ipv6_addr_set(v4mapped,
390 0, 0,
391 htonl(0x0000FFFF),
392 addr);
393 }
394
395 /*
396 * find the first different bit between two addresses
397 * length of address must be a multiple of 32bits
398 */
399 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
400 {
401 const __be32 *a1 = token1, *a2 = token2;
402 int i;
403
404 addrlen >>= 2;
405
406 for (i = 0; i < addrlen; i++) {
407 __be32 xb = a1[i] ^ a2[i];
408 if (xb)
409 return i * 32 + 32 - fls(ntohl(xb));
410 }
411
412 /*
413 * we should *never* get to this point since that
414 * would mean the addrs are equal
415 *
416 * However, we do get to it 8) And exacly, when
417 * addresses are equal 8)
418 *
419 * ip route add 1111::/128 via ...
420 * ip route add 1111::/64 via ...
421 * and we are here.
422 *
423 * Ideally, this function should stop comparison
424 * at prefix length. It does not, but it is still OK,
425 * if returned value is greater than prefix length.
426 * --ANK (980803)
427 */
428 return (addrlen << 5);
429 }
430
431 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
432 {
433 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
434 }
435
436 /*
437 * Prototypes exported by ipv6
438 */
439
440 /*
441 * rcv function (called from netdevice level)
442 */
443
444 extern int ipv6_rcv(struct sk_buff *skb,
445 struct net_device *dev,
446 struct packet_type *pt,
447 struct net_device *orig_dev);
448
449 extern int ip6_rcv_finish(struct sk_buff *skb);
450
451 /*
452 * upper-layer output functions
453 */
454 extern int ip6_xmit(struct sock *sk,
455 struct sk_buff *skb,
456 struct flowi *fl,
457 struct ipv6_txoptions *opt,
458 int ipfragok);
459
460 extern int ip6_nd_hdr(struct sock *sk,
461 struct sk_buff *skb,
462 struct net_device *dev,
463 const struct in6_addr *saddr,
464 const struct in6_addr *daddr,
465 int proto, int len);
466
467 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
468
469 extern int ip6_append_data(struct sock *sk,
470 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
471 void *from,
472 int length,
473 int transhdrlen,
474 int hlimit,
475 int tclass,
476 struct ipv6_txoptions *opt,
477 struct flowi *fl,
478 struct rt6_info *rt,
479 unsigned int flags);
480
481 extern int ip6_push_pending_frames(struct sock *sk);
482
483 extern void ip6_flush_pending_frames(struct sock *sk);
484
485 extern int ip6_dst_lookup(struct sock *sk,
486 struct dst_entry **dst,
487 struct flowi *fl);
488 extern int ip6_dst_blackhole(struct sock *sk,
489 struct dst_entry **dst,
490 struct flowi *fl);
491 extern int ip6_sk_dst_lookup(struct sock *sk,
492 struct dst_entry **dst,
493 struct flowi *fl);
494
495 /*
496 * skb processing functions
497 */
498
499 extern int ip6_output(struct sk_buff *skb);
500 extern int ip6_forward(struct sk_buff *skb);
501 extern int ip6_input(struct sk_buff *skb);
502 extern int ip6_mc_input(struct sk_buff *skb);
503
504 extern int __ip6_local_out(struct sk_buff *skb);
505 extern int ip6_local_out(struct sk_buff *skb);
506
507 /*
508 * Extension header (options) processing
509 */
510
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 ip6_datagram_connect(struct sock *sk,
550 struct sockaddr *addr, int addr_len);
551
552 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
553 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
554 u32 info, u8 *payload);
555 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
556
557 extern int inet6_release(struct socket *sock);
558 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
559 int addr_len);
560 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
561 int *uaddr_len, int peer);
562 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
563 unsigned long arg);
564
565 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
566 struct sock *sk);
567
568 /*
569 * reassembly.c
570 */
571 extern const struct proto_ops inet6_stream_ops;
572 extern const struct proto_ops inet6_dgram_ops;
573
574 struct group_source_req;
575 struct group_filter;
576
577 extern int ip6_mc_source(int add, int omode, struct sock *sk,
578 struct group_source_req *pgsr);
579 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
580 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
581 struct group_filter __user *optval,
582 int __user *optlen);
583
584 #ifdef CONFIG_PROC_FS
585 extern int ac6_proc_init(struct net *net);
586 extern void ac6_proc_exit(struct net *net);
587 extern int raw6_proc_init(void);
588 extern void raw6_proc_exit(void);
589 extern int tcp6_proc_init(struct net *net);
590 extern void tcp6_proc_exit(struct net *net);
591 extern int udp6_proc_init(struct net *net);
592 extern void udp6_proc_exit(struct net *net);
593 extern int udplite6_proc_init(void);
594 extern void udplite6_proc_exit(void);
595 extern int ipv6_misc_proc_init(void);
596 extern void ipv6_misc_proc_exit(void);
597 extern int snmp6_register_dev(struct inet6_dev *idev);
598 extern int snmp6_unregister_dev(struct inet6_dev *idev);
599
600 #else
601 static inline int ac6_proc_init(struct net *net) { return 0; }
602 static inline void ac6_proc_exit(struct net *net) { }
603 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
604 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
605 #endif
606
607 #ifdef CONFIG_SYSCTL
608 extern ctl_table ipv6_route_table_template[];
609 extern ctl_table ipv6_icmp_table_template[];
610
611 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
612 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
613 extern int ipv6_sysctl_register(void);
614 extern void ipv6_sysctl_unregister(void);
615 #endif
616
617 #endif /* __KERNEL__ */
618 #endif /* _NET_IPV6_H */
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