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[PATCH] uml: __user annotation in arch_prctl
[hh.org.git] / include / net / ipv6.h
blob4abedb8eaece67a43e4a091cca197477c025cc7a
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 <linux/config.h>
108 #include <net/sock.h>
109
110 /* sysctls */
111 extern int sysctl_ipv6_bindv6only;
112 extern int sysctl_mld_max_msf;
113
114 /* MIBs */
115 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
116 #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
117 #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
118 #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
119 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
120 #define ICMP6_INC_STATS(idev, field) ({ \
121 struct inet6_dev *_idev = (idev); \
122 if (likely(_idev != NULL)) \
123 SNMP_INC_STATS(idev->stats.icmpv6, field); \
124 SNMP_INC_STATS(icmpv6_statistics, field); \
125 })
126 #define ICMP6_INC_STATS_BH(idev, field) ({ \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
130 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
131 })
132 #define ICMP6_INC_STATS_USER(idev, field) ({ \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
136 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
137 })
138 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
139 struct inet6_dev *_idev = idev; \
140 __typeof__(offset) _offset = (offset); \
141 if (likely(_idev != NULL)) \
142 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
143 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
144 })
145 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
146 #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
147 #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
148 #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
149
150 int snmp6_register_dev(struct inet6_dev *idev);
151 int snmp6_unregister_dev(struct inet6_dev *idev);
152 int snmp6_alloc_dev(struct inet6_dev *idev);
153 int snmp6_free_dev(struct inet6_dev *idev);
154 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
155 void snmp6_mib_free(void *ptr[2]);
156
157 struct ip6_ra_chain
158 {
159 struct ip6_ra_chain *next;
160 struct sock *sk;
161 int sel;
162 void (*destructor)(struct sock *);
163 };
164
165 extern struct ip6_ra_chain *ip6_ra_chain;
166 extern rwlock_t ip6_ra_lock;
167
168 /*
169 This structure is prepared by protocol, when parsing
170 ancillary data and passed to IPv6.
171 */
172
173 struct ipv6_txoptions
174 {
175 /* Length of this structure */
176 int tot_len;
177
178 /* length of extension headers */
179
180 __u16 opt_flen; /* after fragment hdr */
181 __u16 opt_nflen; /* before fragment hdr */
182
183 struct ipv6_opt_hdr *hopopt;
184 struct ipv6_opt_hdr *dst0opt;
185 struct ipv6_rt_hdr *srcrt; /* Routing Header */
186 struct ipv6_opt_hdr *dst1opt;
187
188 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
189 };
190
191 struct ip6_flowlabel
192 {
193 struct ip6_flowlabel *next;
194 u32 label;
195 struct in6_addr dst;
196 struct ipv6_txoptions *opt;
197 atomic_t users;
198 unsigned long linger;
199 u8 share;
200 u32 owner;
201 unsigned long lastuse;
202 unsigned long expires;
203 };
204
205 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
206 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
207
208 struct ipv6_fl_socklist
209 {
210 struct ipv6_fl_socklist *next;
211 struct ip6_flowlabel *fl;
212 };
213
214 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
215 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
216 struct ip6_flowlabel * fl,
217 struct ipv6_txoptions * fopt);
218 extern void fl6_free_socklist(struct sock *sk);
219 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
220 extern void ip6_flowlabel_init(void);
221 extern void ip6_flowlabel_cleanup(void);
222
223 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
224 {
225 if (fl)
226 atomic_dec(&fl->users);
227 }
228
229 extern int ip6_ra_control(struct sock *sk, int sel,
230 void (*destructor)(struct sock *));
231
232
233 extern int ipv6_parse_hopopts(struct sk_buff *skb);
234
235 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
236 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
237 int newtype,
238 struct ipv6_opt_hdr __user *newopt,
239 int newoptlen);
240 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
241 struct ipv6_txoptions *opt);
242
243 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
244
245 extern int ip6_frag_nqueues;
246 extern atomic_t ip6_frag_mem;
247
248 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
249
250 /*
251 * Function prototype for build_xmit
252 */
253
254 typedef int (*inet_getfrag_t) (const void *data,
255 struct in6_addr *addr,
256 char *,
257 unsigned int, unsigned int);
258
259 extern int __ipv6_addr_type(const struct in6_addr *addr);
260 static inline int ipv6_addr_type(const struct in6_addr *addr)
261 {
262 return __ipv6_addr_type(addr) & 0xffff;
263 }
264
265 static inline int ipv6_addr_scope(const struct in6_addr *addr)
266 {
267 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
268 }
269
270 static inline int __ipv6_addr_src_scope(int type)
271 {
272 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
273 }
274
275 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
276 {
277 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
278 }
279
280 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
281 {
282 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
283 }
284
285 static inline int
286 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
287 const struct in6_addr *a2)
288 {
289 unsigned int i;
290
291 for (i = 0; i < 4; i++)
292 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
293 return 1;
294 return 0;
295 }
296
297 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
298 {
299 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
300 }
301
302 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
303 const struct in6_addr *addr,
304 int plen)
305 {
306 /* caller must guarantee 0 <= plen <= 128 */
307 int o = plen >> 3,
308 b = plen & 0x7;
309
310 memcpy(pfx->s6_addr, addr, o);
311 if (b != 0) {
312 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
313 o++;
314 }
315 if (o < 16)
316 memset(pfx->s6_addr + o, 0, 16 - o);
317 }
318
319 #ifndef __HAVE_ARCH_ADDR_SET
320 static inline void ipv6_addr_set(struct in6_addr *addr,
321 __u32 w1, __u32 w2,
322 __u32 w3, __u32 w4)
323 {
324 addr->s6_addr32[0] = w1;
325 addr->s6_addr32[1] = w2;
326 addr->s6_addr32[2] = w3;
327 addr->s6_addr32[3] = w4;
328 }
329 #endif
330
331 static inline int ipv6_addr_equal(const struct in6_addr *a1,
332 const struct in6_addr *a2)
333 {
334 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
335 a1->s6_addr32[1] == a2->s6_addr32[1] &&
336 a1->s6_addr32[2] == a2->s6_addr32[2] &&
337 a1->s6_addr32[3] == a2->s6_addr32[3]);
338 }
339
340 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
341 unsigned int prefixlen)
342 {
343 unsigned pdw, pbi;
344
345 /* check complete u32 in prefix */
346 pdw = prefixlen >> 5;
347 if (pdw && memcmp(a1, a2, pdw << 2))
348 return 0;
349
350 /* check incomplete u32 in prefix */
351 pbi = prefixlen & 0x1f;
352 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
353 return 0;
354
355 return 1;
356 }
357
358 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
359 const struct in6_addr *a2,
360 unsigned int prefixlen)
361 {
362 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
363 prefixlen);
364 }
365
366 static inline int ipv6_addr_any(const struct in6_addr *a)
367 {
368 return ((a->s6_addr32[0] | a->s6_addr32[1] |
369 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
370 }
371
372 /*
373 * find the first different bit between two addresses
374 * length of address must be a multiple of 32bits
375 */
376 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
377 {
378 const __u32 *a1 = token1, *a2 = token2;
379 int i;
380
381 addrlen >>= 2;
382
383 for (i = 0; i < addrlen; i++) {
384 __u32 xb = a1[i] ^ a2[i];
385 if (xb) {
386 int j = 31;
387
388 xb = ntohl(xb);
389 while ((xb & (1 << j)) == 0)
390 j--;
391
392 return (i * 32 + 31 - j);
393 }
394 }
395
396 /*
397 * we should *never* get to this point since that
398 * would mean the addrs are equal
399 *
400 * However, we do get to it 8) And exacly, when
401 * addresses are equal 8)
402 *
403 * ip route add 1111::/128 via ...
404 * ip route add 1111::/64 via ...
405 * and we are here.
406 *
407 * Ideally, this function should stop comparison
408 * at prefix length. It does not, but it is still OK,
409 * if returned value is greater than prefix length.
410 * --ANK (980803)
411 */
412 return (addrlen << 5);
413 }
414
415 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
416 {
417 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
418 }
419
420 /*
421 * Prototypes exported by ipv6
422 */
423
424 /*
425 * rcv function (called from netdevice level)
426 */
427
428 extern int ipv6_rcv(struct sk_buff *skb,
429 struct net_device *dev,
430 struct packet_type *pt,
431 struct net_device *orig_dev);
432
433 extern int ip6_rcv_finish(struct sk_buff *skb);
434
435 /*
436 * upper-layer output functions
437 */
438 extern int ip6_xmit(struct sock *sk,
439 struct sk_buff *skb,
440 struct flowi *fl,
441 struct ipv6_txoptions *opt,
442 int ipfragok);
443
444 extern int ip6_nd_hdr(struct sock *sk,
445 struct sk_buff *skb,
446 struct net_device *dev,
447 struct in6_addr *saddr,
448 struct in6_addr *daddr,
449 int proto, int len);
450
451 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
452
453 extern int ip6_append_data(struct sock *sk,
454 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
455 void *from,
456 int length,
457 int transhdrlen,
458 int hlimit,
459 int tclass,
460 struct ipv6_txoptions *opt,
461 struct flowi *fl,
462 struct rt6_info *rt,
463 unsigned int flags);
464
465 extern int ip6_push_pending_frames(struct sock *sk);
466
467 extern void ip6_flush_pending_frames(struct sock *sk);
468
469 extern int ip6_dst_lookup(struct sock *sk,
470 struct dst_entry **dst,
471 struct flowi *fl);
472
473 /*
474 * skb processing functions
475 */
476
477 extern int ip6_output(struct sk_buff *skb);
478 extern int ip6_forward(struct sk_buff *skb);
479 extern int ip6_input(struct sk_buff *skb);
480 extern int ip6_mc_input(struct sk_buff *skb);
481
482 /*
483 * Extension header (options) processing
484 */
485
486 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
487 u8 *prev_hdr,
488 struct ipv6_txoptions *opt,
489 struct in6_addr *daddr,
490 u32 jumbolen);
491 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
492 u8 *prev_hdr,
493 struct ipv6_txoptions *opt);
494 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
495 struct ipv6_txoptions *opt,
496 u8 *proto,
497 struct in6_addr **daddr_p);
498 extern void ipv6_push_frag_opts(struct sk_buff *skb,
499 struct ipv6_txoptions *opt,
500 u8 *proto);
501
502 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
503 u8 *nexthdrp);
504
505 extern int ipv6_ext_hdr(u8 nexthdr);
506
507 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
508 struct ipv6_rt_hdr *hdr);
509
510
511 /*
512 * socket options (ipv6_sockglue.c)
513 */
514
515 extern int ipv6_setsockopt(struct sock *sk, int level,
516 int optname,
517 char __user *optval,
518 int optlen);
519 extern int ipv6_getsockopt(struct sock *sk, int level,
520 int optname,
521 char __user *optval,
522 int __user *optlen);
523 extern int compat_ipv6_setsockopt(struct sock *sk,
524 int level,
525 int optname,
526 char __user *optval,
527 int optlen);
528 extern int compat_ipv6_getsockopt(struct sock *sk,
529 int level,
530 int optname,
531 char __user *optval,
532 int __user *optlen);
533
534 extern void ipv6_packet_init(void);
535
536 extern void ipv6_packet_cleanup(void);
537
538 extern int ip6_datagram_connect(struct sock *sk,
539 struct sockaddr *addr, int addr_len);
540
541 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
542 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
543 u32 info, u8 *payload);
544 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
545
546 extern int inet6_release(struct socket *sock);
547 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
548 int addr_len);
549 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
550 int *uaddr_len, int peer);
551 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
552 unsigned long arg);
553
554 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
555 struct sock *sk);
556
557 /*
558 * reassembly.c
559 */
560 extern int sysctl_ip6frag_high_thresh;
561 extern int sysctl_ip6frag_low_thresh;
562 extern int sysctl_ip6frag_time;
563 extern int sysctl_ip6frag_secret_interval;
564
565 extern const struct proto_ops inet6_stream_ops;
566 extern const struct proto_ops inet6_dgram_ops;
567
568 struct group_source_req;
569 struct group_filter;
570
571 extern int ip6_mc_source(int add, int omode, struct sock *sk,
572 struct group_source_req *pgsr);
573 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
574 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
575 struct group_filter __user *optval,
576 int __user *optlen);
577
578 #ifdef CONFIG_PROC_FS
579 extern int ac6_proc_init(void);
580 extern void ac6_proc_exit(void);
581 extern int raw6_proc_init(void);
582 extern void raw6_proc_exit(void);
583 extern int tcp6_proc_init(void);
584 extern void tcp6_proc_exit(void);
585 extern int udp6_proc_init(void);
586 extern void udp6_proc_exit(void);
587 extern int ipv6_misc_proc_init(void);
588 extern void ipv6_misc_proc_exit(void);
589
590 extern struct rt6_statistics rt6_stats;
591 #endif
592
593 #ifdef CONFIG_SYSCTL
594 extern ctl_table ipv6_route_table[];
595 extern ctl_table ipv6_icmp_table[];
596
597 extern void ipv6_sysctl_register(void);
598 extern void ipv6_sysctl_unregister(void);
599 #endif
600
601 #endif /* __KERNEL__ */
602 #endif /* _NET_IPV6_H */
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