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ide: fix refcounting in device drivers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / net / ipv6.h
blob6d5b58a1c743cc5bfd587c26905bcbeb9d5966af
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_ESP 50 /* Encapsulating security payload. */
38 #define NEXTHDR_AUTH 51 /* Authentication header. */
39 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40 #define NEXTHDR_NONE 59 /* No next header */
41 #define NEXTHDR_DEST 60 /* Destination options header. */
42 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
43
44 #define NEXTHDR_MAX 255
45
46
47
48 #define IPV6_DEFAULT_HOPLIMIT 64
49 #define IPV6_DEFAULT_MCASTHOPS 1
50
51 /*
52 * Addr type
53 *
54 * type - unicast | multicast
55 * scope - local | site | global
56 * v4 - compat
57 * v4mapped
58 * any
59 * loopback
60 */
61
62 #define IPV6_ADDR_ANY 0x0000U
63
64 #define IPV6_ADDR_UNICAST 0x0001U
65 #define IPV6_ADDR_MULTICAST 0x0002U
66
67 #define IPV6_ADDR_LOOPBACK 0x0010U
68 #define IPV6_ADDR_LINKLOCAL 0x0020U
69 #define IPV6_ADDR_SITELOCAL 0x0040U
70
71 #define IPV6_ADDR_COMPATv4 0x0080U
72
73 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
74
75 #define IPV6_ADDR_MAPPED 0x1000U
76 #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
77
78 /*
79 * Addr scopes
80 */
81 #ifdef __KERNEL__
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
85 #endif
86 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
91
92 /*
93 * fragmentation header
94 */
95
96 struct frag_hdr {
97 __u8 nexthdr;
98 __u8 reserved;
99 __be16 frag_off;
100 __be32 identification;
101 };
102
103 #define IP6_MF 0x0001
104
105 #ifdef __KERNEL__
106
107 #include <net/sock.h>
108
109 /* sysctls */
110 extern int sysctl_mld_max_msf;
111 extern struct ctl_path net_ipv6_ctl_path[];
112
113 #define _DEVINC(net, statname, modifier, idev, field) \
114 ({ \
115 struct inet6_dev *_idev = (idev); \
116 if (likely(_idev != NULL)) \
117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
118 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
119 })
120
121 #define _DEVADD(net, statname, modifier, idev, field, val) \
122 ({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
126 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
127 })
128
129 /* MIBs */
130
131 #define IP6_INC_STATS(net, idev,field) \
132 _DEVINC(net, ipv6, , idev, field)
133 #define IP6_INC_STATS_BH(net, idev,field) \
134 _DEVINC(net, ipv6, _BH, idev, field)
135 #define IP6_ADD_STATS_BH(net, idev,field,val) \
136 _DEVADD(net, ipv6, _BH, idev, field, val)
137
138 #define ICMP6_INC_STATS(net, idev, field) \
139 _DEVINC(net, icmpv6, , idev, field)
140 #define ICMP6_INC_STATS_BH(net, idev, field) \
141 _DEVINC(net, icmpv6, _BH, idev, field)
142
143 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
144 _DEVINC(net, icmpv6msg, , idev, field +256)
145 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
146 _DEVINC(net, icmpv6msg, _BH, idev, field +256)
147 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
148 _DEVINC(net, icmpv6msg, _BH, idev, field)
149
150 struct ip6_ra_chain
151 {
152 struct ip6_ra_chain *next;
153 struct sock *sk;
154 int sel;
155 void (*destructor)(struct sock *);
156 };
157
158 extern struct ip6_ra_chain *ip6_ra_chain;
159 extern rwlock_t ip6_ra_lock;
160
161 /*
162 This structure is prepared by protocol, when parsing
163 ancillary data and passed to IPv6.
164 */
165
166 struct ipv6_txoptions
167 {
168 /* Length of this structure */
169 int tot_len;
170
171 /* length of extension headers */
172
173 __u16 opt_flen; /* after fragment hdr */
174 __u16 opt_nflen; /* before fragment hdr */
175
176 struct ipv6_opt_hdr *hopopt;
177 struct ipv6_opt_hdr *dst0opt;
178 struct ipv6_rt_hdr *srcrt; /* Routing Header */
179 struct ipv6_opt_hdr *dst1opt;
180
181 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
182 };
183
184 struct ip6_flowlabel
185 {
186 struct ip6_flowlabel *next;
187 __be32 label;
188 atomic_t users;
189 struct in6_addr dst;
190 struct ipv6_txoptions *opt;
191 unsigned long linger;
192 u8 share;
193 u32 owner;
194 unsigned long lastuse;
195 unsigned long expires;
196 struct net *fl_net;
197 };
198
199 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
200 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
201
202 struct ipv6_fl_socklist
203 {
204 struct ipv6_fl_socklist *next;
205 struct ip6_flowlabel *fl;
206 };
207
208 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
209 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
210 struct ip6_flowlabel * fl,
211 struct ipv6_txoptions * fopt);
212 extern void fl6_free_socklist(struct sock *sk);
213 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
214 extern int ip6_flowlabel_init(void);
215 extern void ip6_flowlabel_cleanup(void);
216
217 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
218 {
219 if (fl)
220 atomic_dec(&fl->users);
221 }
222
223 extern int ip6_ra_control(struct sock *sk, int sel);
224
225 extern int ipv6_parse_hopopts(struct sk_buff *skb);
226
227 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
228 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
229 int newtype,
230 struct ipv6_opt_hdr __user *newopt,
231 int newoptlen);
232 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
233 struct ipv6_txoptions *opt);
234
235 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
236
237 int ip6_frag_nqueues(struct net *net);
238 int ip6_frag_mem(struct net *net);
239
240 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
241
242 extern int __ipv6_addr_type(const struct in6_addr *addr);
243 static inline int ipv6_addr_type(const struct in6_addr *addr)
244 {
245 return __ipv6_addr_type(addr) & 0xffff;
246 }
247
248 static inline int ipv6_addr_scope(const struct in6_addr *addr)
249 {
250 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
251 }
252
253 static inline int __ipv6_addr_src_scope(int type)
254 {
255 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
256 }
257
258 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
259 {
260 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
261 }
262
263 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
264 {
265 return memcmp(a1, a2, sizeof(struct in6_addr));
266 }
267
268 static inline int
269 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
270 const struct in6_addr *a2)
271 {
272 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
273 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
274 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
275 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
276 }
277
278 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
279 {
280 memcpy(a1, a2, sizeof(struct in6_addr));
281 }
282
283 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
284 const struct in6_addr *addr,
285 int plen)
286 {
287 /* caller must guarantee 0 <= plen <= 128 */
288 int o = plen >> 3,
289 b = plen & 0x7;
290
291 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
292 memcpy(pfx->s6_addr, addr, o);
293 if (b != 0)
294 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
295 }
296
297 static inline void ipv6_addr_set(struct in6_addr *addr,
298 __be32 w1, __be32 w2,
299 __be32 w3, __be32 w4)
300 {
301 addr->s6_addr32[0] = w1;
302 addr->s6_addr32[1] = w2;
303 addr->s6_addr32[2] = w3;
304 addr->s6_addr32[3] = w4;
305 }
306
307 static inline int ipv6_addr_equal(const struct in6_addr *a1,
308 const struct in6_addr *a2)
309 {
310 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
311 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
312 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
313 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
314 }
315
316 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
317 unsigned int prefixlen)
318 {
319 unsigned pdw, pbi;
320
321 /* check complete u32 in prefix */
322 pdw = prefixlen >> 5;
323 if (pdw && memcmp(a1, a2, pdw << 2))
324 return 0;
325
326 /* check incomplete u32 in prefix */
327 pbi = prefixlen & 0x1f;
328 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
329 return 0;
330
331 return 1;
332 }
333
334 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
335 const struct in6_addr *a2,
336 unsigned int prefixlen)
337 {
338 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
339 prefixlen);
340 }
341
342 struct inet_frag_queue;
343
344 struct ip6_create_arg {
345 __be32 id;
346 struct in6_addr *src;
347 struct in6_addr *dst;
348 };
349
350 void ip6_frag_init(struct inet_frag_queue *q, void *a);
351 int ip6_frag_match(struct inet_frag_queue *q, void *a);
352
353 static inline int ipv6_addr_any(const struct in6_addr *a)
354 {
355 return ((a->s6_addr32[0] | a->s6_addr32[1] |
356 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
357 }
358
359 static inline int ipv6_addr_loopback(const struct in6_addr *a)
360 {
361 return ((a->s6_addr32[0] | a->s6_addr32[1] |
362 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
363 }
364
365 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
366 {
367 return ((a->s6_addr32[0] | a->s6_addr32[1] |
368 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
369 }
370
371 /*
372 * Check for a RFC 4843 ORCHID address
373 * (Overlay Routable Cryptographic Hash Identifiers)
374 */
375 static inline int ipv6_addr_orchid(const struct in6_addr *a)
376 {
377 return ((a->s6_addr32[0] & htonl(0xfffffff0))
378 == htonl(0x20010010));
379 }
380
381 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
382 struct in6_addr *v4mapped)
383 {
384 ipv6_addr_set(v4mapped,
385 0, 0,
386 htonl(0x0000FFFF),
387 addr);
388 }
389
390 /*
391 * find the first different bit between two addresses
392 * length of address must be a multiple of 32bits
393 */
394 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
395 {
396 const __be32 *a1 = token1, *a2 = token2;
397 int i;
398
399 addrlen >>= 2;
400
401 for (i = 0; i < addrlen; i++) {
402 __be32 xb = a1[i] ^ a2[i];
403 if (xb)
404 return i * 32 + 32 - fls(ntohl(xb));
405 }
406
407 /*
408 * we should *never* get to this point since that
409 * would mean the addrs are equal
410 *
411 * However, we do get to it 8) And exacly, when
412 * addresses are equal 8)
413 *
414 * ip route add 1111::/128 via ...
415 * ip route add 1111::/64 via ...
416 * and we are here.
417 *
418 * Ideally, this function should stop comparison
419 * at prefix length. It does not, but it is still OK,
420 * if returned value is greater than prefix length.
421 * --ANK (980803)
422 */
423 return (addrlen << 5);
424 }
425
426 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
427 {
428 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
429 }
430
431 /*
432 * Prototypes exported by ipv6
433 */
434
435 /*
436 * rcv function (called from netdevice level)
437 */
438
439 extern int ipv6_rcv(struct sk_buff *skb,
440 struct net_device *dev,
441 struct packet_type *pt,
442 struct net_device *orig_dev);
443
444 extern int ip6_rcv_finish(struct sk_buff *skb);
445
446 /*
447 * upper-layer output functions
448 */
449 extern int ip6_xmit(struct sock *sk,
450 struct sk_buff *skb,
451 struct flowi *fl,
452 struct ipv6_txoptions *opt,
453 int ipfragok);
454
455 extern int ip6_nd_hdr(struct sock *sk,
456 struct sk_buff *skb,
457 struct net_device *dev,
458 const struct in6_addr *saddr,
459 const struct in6_addr *daddr,
460 int proto, int len);
461
462 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
463
464 extern int ip6_append_data(struct sock *sk,
465 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
466 void *from,
467 int length,
468 int transhdrlen,
469 int hlimit,
470 int tclass,
471 struct ipv6_txoptions *opt,
472 struct flowi *fl,
473 struct rt6_info *rt,
474 unsigned int flags);
475
476 extern int ip6_push_pending_frames(struct sock *sk);
477
478 extern void ip6_flush_pending_frames(struct sock *sk);
479
480 extern int ip6_dst_lookup(struct sock *sk,
481 struct dst_entry **dst,
482 struct flowi *fl);
483 extern int ip6_dst_blackhole(struct sock *sk,
484 struct dst_entry **dst,
485 struct flowi *fl);
486 extern int ip6_sk_dst_lookup(struct sock *sk,
487 struct dst_entry **dst,
488 struct flowi *fl);
489
490 /*
491 * skb processing functions
492 */
493
494 extern int ip6_output(struct sk_buff *skb);
495 extern int ip6_forward(struct sk_buff *skb);
496 extern int ip6_input(struct sk_buff *skb);
497 extern int ip6_mc_input(struct sk_buff *skb);
498
499 extern int __ip6_local_out(struct sk_buff *skb);
500 extern int ip6_local_out(struct sk_buff *skb);
501
502 /*
503 * Extension header (options) processing
504 */
505
506 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
507 struct ipv6_txoptions *opt,
508 u8 *proto,
509 struct in6_addr **daddr_p);
510 extern void ipv6_push_frag_opts(struct sk_buff *skb,
511 struct ipv6_txoptions *opt,
512 u8 *proto);
513
514 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
515 u8 *nexthdrp);
516
517 extern int ipv6_ext_hdr(u8 nexthdr);
518
519 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
520
521 /*
522 * socket options (ipv6_sockglue.c)
523 */
524
525 extern int ipv6_setsockopt(struct sock *sk, int level,
526 int optname,
527 char __user *optval,
528 int optlen);
529 extern int ipv6_getsockopt(struct sock *sk, int level,
530 int optname,
531 char __user *optval,
532 int __user *optlen);
533 extern int compat_ipv6_setsockopt(struct sock *sk,
534 int level,
535 int optname,
536 char __user *optval,
537 int optlen);
538 extern int compat_ipv6_getsockopt(struct sock *sk,
539 int level,
540 int optname,
541 char __user *optval,
542 int __user *optlen);
543
544 extern int ip6_datagram_connect(struct sock *sk,
545 struct sockaddr *addr, int addr_len);
546
547 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
548 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
549 u32 info, u8 *payload);
550 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
551
552 extern int inet6_release(struct socket *sock);
553 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
554 int addr_len);
555 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
556 int *uaddr_len, int peer);
557 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
558 unsigned long arg);
559
560 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
561 struct sock *sk);
562
563 /*
564 * reassembly.c
565 */
566 extern const struct proto_ops inet6_stream_ops;
567 extern const struct proto_ops inet6_dgram_ops;
568
569 struct group_source_req;
570 struct group_filter;
571
572 extern int ip6_mc_source(int add, int omode, struct sock *sk,
573 struct group_source_req *pgsr);
574 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
575 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
576 struct group_filter __user *optval,
577 int __user *optlen);
578 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
579 const struct in6_addr *daddr, u32 rnd);
580
581 #ifdef CONFIG_PROC_FS
582 extern int ac6_proc_init(struct net *net);
583 extern void ac6_proc_exit(struct net *net);
584 extern int raw6_proc_init(void);
585 extern void raw6_proc_exit(void);
586 extern int tcp6_proc_init(struct net *net);
587 extern void tcp6_proc_exit(struct net *net);
588 extern int udp6_proc_init(struct net *net);
589 extern void udp6_proc_exit(struct net *net);
590 extern int udplite6_proc_init(void);
591 extern void udplite6_proc_exit(void);
592 extern int ipv6_misc_proc_init(void);
593 extern void ipv6_misc_proc_exit(void);
594 extern int snmp6_register_dev(struct inet6_dev *idev);
595 extern int snmp6_unregister_dev(struct inet6_dev *idev);
596
597 #else
598 static inline int ac6_proc_init(struct net *net) { return 0; }
599 static inline void ac6_proc_exit(struct net *net) { }
600 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
601 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
602 #endif
603
604 #ifdef CONFIG_SYSCTL
605 extern ctl_table ipv6_route_table_template[];
606 extern ctl_table ipv6_icmp_table_template[];
607
608 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
609 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
610 extern int ipv6_sysctl_register(void);
611 extern void ipv6_sysctl_unregister(void);
612 extern int ipv6_static_sysctl_register(void);
613 extern void ipv6_static_sysctl_unregister(void);
614 #endif
615
616 #endif /* __KERNEL__ */
617 #endif /* _NET_IPV6_H */
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