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[PATCH] w1: Userspace communication protocol over connector.
[linux-2.6/verdex.git] / include / net / ipv6.h
bloba8fdf7970b370a8aca9f216a72fec4b7b378d60e
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/ndisc.h>
21 #include <net/flow.h>
22 #include <net/snmp.h>
23
24 #define SIN6_LEN_RFC2133 24
25
26 #define IPV6_MAXPLEN 65535
27
28 /*
29 * NextHeader field of IPv6 header
30 */
31
32 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33 #define NEXTHDR_TCP 6 /* TCP segment. */
34 #define NEXTHDR_UDP 17 /* UDP message. */
35 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
36 #define NEXTHDR_ROUTING 43 /* Routing header. */
37 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly 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
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 unsigned char nexthdr;
98 unsigned char reserved;
99 unsigned short frag_off;
100 __u32 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_ipv6_bindv6only;
111 extern int sysctl_mld_max_msf;
112
113 /* MIBs */
114 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
115 #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
116 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
117 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
118 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
119 #define ICMP6_INC_STATS(idev, field) ({ \
120 struct inet6_dev *_idev = (idev); \
121 if (likely(_idev != NULL)) \
122 SNMP_INC_STATS(idev->stats.icmpv6, field); \
123 SNMP_INC_STATS(icmpv6_statistics, field); \
124 })
125 #define ICMP6_INC_STATS_BH(idev, field) ({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
129 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
130 })
131 #define ICMP6_INC_STATS_USER(idev, field) ({ \
132 struct inet6_dev *_idev = (idev); \
133 if (likely(_idev != NULL)) \
134 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
135 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
136 })
137 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
138 struct inet6_dev *_idev = idev; \
139 __typeof__(offset) _offset = (offset); \
140 if (likely(_idev != NULL)) \
141 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
142 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
143 })
144 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
145 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
146 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
147 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
148
149 int snmp6_register_dev(struct inet6_dev *idev);
150 int snmp6_unregister_dev(struct inet6_dev *idev);
151 int snmp6_alloc_dev(struct inet6_dev *idev);
152 int snmp6_free_dev(struct inet6_dev *idev);
153 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
154 void snmp6_mib_free(void *ptr[2]);
155
156 struct ip6_ra_chain
157 {
158 struct ip6_ra_chain *next;
159 struct sock *sk;
160 int sel;
161 void (*destructor)(struct sock *);
162 };
163
164 extern struct ip6_ra_chain *ip6_ra_chain;
165 extern rwlock_t ip6_ra_lock;
166
167 /*
168 This structure is prepared by protocol, when parsing
169 ancillary data and passed to IPv6.
170 */
171
172 struct ipv6_txoptions
173 {
174 /* Length of this structure */
175 int tot_len;
176
177 /* length of extension headers */
178
179 __u16 opt_flen; /* after fragment hdr */
180 __u16 opt_nflen; /* before fragment hdr */
181
182 struct ipv6_opt_hdr *hopopt;
183 struct ipv6_opt_hdr *dst0opt;
184 struct ipv6_rt_hdr *srcrt; /* Routing Header */
185 struct ipv6_opt_hdr *dst1opt;
186
187 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
188 };
189
190 struct ip6_flowlabel
191 {
192 struct ip6_flowlabel *next;
193 u32 label;
194 struct in6_addr dst;
195 struct ipv6_txoptions *opt;
196 atomic_t users;
197 unsigned long linger;
198 u8 share;
199 u32 owner;
200 unsigned long lastuse;
201 unsigned long expires;
202 };
203
204 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
205 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
206
207 struct ipv6_fl_socklist
208 {
209 struct ipv6_fl_socklist *next;
210 struct ip6_flowlabel *fl;
211 };
212
213 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
214 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
215 struct ip6_flowlabel * fl,
216 struct ipv6_txoptions * fopt);
217 extern void fl6_free_socklist(struct sock *sk);
218 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
219 extern void ip6_flowlabel_init(void);
220 extern void ip6_flowlabel_cleanup(void);
221
222 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
223 {
224 if (fl)
225 atomic_dec(&fl->users);
226 }
227
228 extern int ip6_ra_control(struct sock *sk, int sel,
229 void (*destructor)(struct sock *));
230
231
232 extern int ipv6_parse_hopopts(struct sk_buff *skb);
233
234 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
235 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
236 int newtype,
237 struct ipv6_opt_hdr __user *newopt,
238 int newoptlen);
239 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
240 struct ipv6_txoptions *opt);
241
242 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
243
244 extern int ip6_frag_nqueues;
245 extern atomic_t ip6_frag_mem;
246
247 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
248
249 /*
250 * Function prototype for build_xmit
251 */
252
253 typedef int (*inet_getfrag_t) (const void *data,
254 struct in6_addr *addr,
255 char *,
256 unsigned int, unsigned int);
257
258 extern int __ipv6_addr_type(const struct in6_addr *addr);
259 static inline int ipv6_addr_type(const struct in6_addr *addr)
260 {
261 return __ipv6_addr_type(addr) & 0xffff;
262 }
263
264 static inline int ipv6_addr_scope(const struct in6_addr *addr)
265 {
266 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
267 }
268
269 static inline int __ipv6_addr_src_scope(int type)
270 {
271 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
272 }
273
274 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
275 {
276 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
277 }
278
279 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
280 {
281 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
282 }
283
284 static inline int
285 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
286 const struct in6_addr *a2)
287 {
288 unsigned int i;
289
290 for (i = 0; i < 4; i++)
291 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
292 return 1;
293 return 0;
294 }
295
296 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
297 {
298 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
299 }
300
301 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
302 const struct in6_addr *addr,
303 int plen)
304 {
305 /* caller must guarantee 0 <= plen <= 128 */
306 int o = plen >> 3,
307 b = plen & 0x7;
308
309 memcpy(pfx->s6_addr, addr, o);
310 if (b != 0) {
311 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
312 o++;
313 }
314 if (o < 16)
315 memset(pfx->s6_addr + o, 0, 16 - o);
316 }
317
318 #ifndef __HAVE_ARCH_ADDR_SET
319 static inline void ipv6_addr_set(struct in6_addr *addr,
320 __u32 w1, __u32 w2,
321 __u32 w3, __u32 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 #endif
329
330 static inline int ipv6_addr_equal(const struct in6_addr *a1,
331 const struct in6_addr *a2)
332 {
333 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
334 a1->s6_addr32[1] == a2->s6_addr32[1] &&
335 a1->s6_addr32[2] == a2->s6_addr32[2] &&
336 a1->s6_addr32[3] == a2->s6_addr32[3]);
337 }
338
339 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
340 unsigned int prefixlen)
341 {
342 unsigned pdw, pbi;
343
344 /* check complete u32 in prefix */
345 pdw = prefixlen >> 5;
346 if (pdw && memcmp(a1, a2, pdw << 2))
347 return 0;
348
349 /* check incomplete u32 in prefix */
350 pbi = prefixlen & 0x1f;
351 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
352 return 0;
353
354 return 1;
355 }
356
357 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
358 const struct in6_addr *a2,
359 unsigned int prefixlen)
360 {
361 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
362 prefixlen);
363 }
364
365 static inline int ipv6_addr_any(const struct in6_addr *a)
366 {
367 return ((a->s6_addr32[0] | a->s6_addr32[1] |
368 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
369 }
370
371 /*
372 * find the first different bit between two addresses
373 * length of address must be a multiple of 32bits
374 */
375 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
376 {
377 const __u32 *a1 = token1, *a2 = token2;
378 int i;
379
380 addrlen >>= 2;
381
382 for (i = 0; i < addrlen; i++) {
383 __u32 xb = a1[i] ^ a2[i];
384 if (xb) {
385 int j = 31;
386
387 xb = ntohl(xb);
388 while ((xb & (1 << j)) == 0)
389 j--;
390
391 return (i * 32 + 31 - j);
392 }
393 }
394
395 /*
396 * we should *never* get to this point since that
397 * would mean the addrs are equal
398 *
399 * However, we do get to it 8) And exacly, when
400 * addresses are equal 8)
401 *
402 * ip route add 1111::/128 via ...
403 * ip route add 1111::/64 via ...
404 * and we are here.
405 *
406 * Ideally, this function should stop comparison
407 * at prefix length. It does not, but it is still OK,
408 * if returned value is greater than prefix length.
409 * --ANK (980803)
410 */
411 return (addrlen << 5);
412 }
413
414 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
415 {
416 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
417 }
418
419 /*
420 * Prototypes exported by ipv6
421 */
422
423 /*
424 * rcv function (called from netdevice level)
425 */
426
427 extern int ipv6_rcv(struct sk_buff *skb,
428 struct net_device *dev,
429 struct packet_type *pt,
430 struct net_device *orig_dev);
431
432 extern int ip6_rcv_finish(struct sk_buff *skb);
433
434 /*
435 * upper-layer output functions
436 */
437 extern int ip6_xmit(struct sock *sk,
438 struct sk_buff *skb,
439 struct flowi *fl,
440 struct ipv6_txoptions *opt,
441 int ipfragok);
442
443 extern int ip6_nd_hdr(struct sock *sk,
444 struct sk_buff *skb,
445 struct net_device *dev,
446 struct in6_addr *saddr,
447 struct in6_addr *daddr,
448 int proto, int len);
449
450 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
451
452 extern int ip6_append_data(struct sock *sk,
453 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
454 void *from,
455 int length,
456 int transhdrlen,
457 int hlimit,
458 int tclass,
459 struct ipv6_txoptions *opt,
460 struct flowi *fl,
461 struct rt6_info *rt,
462 unsigned int flags);
463
464 extern int ip6_push_pending_frames(struct sock *sk);
465
466 extern void ip6_flush_pending_frames(struct sock *sk);
467
468 extern int ip6_dst_lookup(struct sock *sk,
469 struct dst_entry **dst,
470 struct flowi *fl);
471
472 /*
473 * skb processing functions
474 */
475
476 extern int ip6_output(struct sk_buff *skb);
477 extern int ip6_forward(struct sk_buff *skb);
478 extern int ip6_input(struct sk_buff *skb);
479 extern int ip6_mc_input(struct sk_buff *skb);
480
481 /*
482 * Extension header (options) processing
483 */
484
485 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
486 u8 *prev_hdr,
487 struct ipv6_txoptions *opt,
488 struct in6_addr *daddr,
489 u32 jumbolen);
490 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
491 u8 *prev_hdr,
492 struct ipv6_txoptions *opt);
493 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
494 struct ipv6_txoptions *opt,
495 u8 *proto,
496 struct in6_addr **daddr_p);
497 extern void ipv6_push_frag_opts(struct sk_buff *skb,
498 struct ipv6_txoptions *opt,
499 u8 *proto);
500
501 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
502 u8 *nexthdrp);
503
504 extern int ipv6_ext_hdr(u8 nexthdr);
505
506 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
507 struct ipv6_rt_hdr *hdr);
508
509
510 /*
511 * socket options (ipv6_sockglue.c)
512 */
513
514 extern int ipv6_setsockopt(struct sock *sk, int level,
515 int optname,
516 char __user *optval,
517 int optlen);
518 extern int ipv6_getsockopt(struct sock *sk, int level,
519 int optname,
520 char __user *optval,
521 int __user *optlen);
522 extern int compat_ipv6_setsockopt(struct sock *sk,
523 int level,
524 int optname,
525 char __user *optval,
526 int optlen);
527 extern int compat_ipv6_getsockopt(struct sock *sk,
528 int level,
529 int optname,
530 char __user *optval,
531 int __user *optlen);
532
533 extern void ipv6_packet_init(void);
534
535 extern void ipv6_packet_cleanup(void);
536
537 extern int ip6_datagram_connect(struct sock *sk,
538 struct sockaddr *addr, int addr_len);
539
540 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
541 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
542 u32 info, u8 *payload);
543 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
544
545 extern int inet6_release(struct socket *sock);
546 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
547 int addr_len);
548 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
549 int *uaddr_len, int peer);
550 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
551 unsigned long arg);
552
553 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
554 struct sock *sk);
555
556 /*
557 * reassembly.c
558 */
559 extern int sysctl_ip6frag_high_thresh;
560 extern int sysctl_ip6frag_low_thresh;
561 extern int sysctl_ip6frag_time;
562 extern int sysctl_ip6frag_secret_interval;
563
564 extern const struct proto_ops inet6_stream_ops;
565 extern const struct proto_ops inet6_dgram_ops;
566
567 struct group_source_req;
568 struct group_filter;
569
570 extern int ip6_mc_source(int add, int omode, struct sock *sk,
571 struct group_source_req *pgsr);
572 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
573 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
574 struct group_filter __user *optval,
575 int __user *optlen);
576
577 #ifdef CONFIG_PROC_FS
578 extern int ac6_proc_init(void);
579 extern void ac6_proc_exit(void);
580 extern int raw6_proc_init(void);
581 extern void raw6_proc_exit(void);
582 extern int tcp6_proc_init(void);
583 extern void tcp6_proc_exit(void);
584 extern int udp6_proc_init(void);
585 extern void udp6_proc_exit(void);
586 extern int ipv6_misc_proc_init(void);
587 extern void ipv6_misc_proc_exit(void);
588
589 extern struct rt6_statistics rt6_stats;
590 #endif
591
592 #ifdef CONFIG_SYSCTL
593 extern ctl_table ipv6_route_table[];
594 extern ctl_table ipv6_icmp_table[];
595
596 extern void ipv6_sysctl_register(void);
597 extern void ipv6_sysctl_unregister(void);
598 #endif
599
600 #endif /* __KERNEL__ */
601 #endif /* _NET_IPV6_H */
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