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libata: fix Seagate NCQ+FLUSH blacklist
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / net / ipv6.h
blob113028fb8f6610c912e57326dbaf6f4bd1c5c649
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(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(statname##_statistics, (field)); \
119 })
120
121 #define _DEVADD(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(statname##_statistics, (field), (val));\
127 })
128
129 /* MIBs */
130 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
131
132 #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
133 #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
134 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
135
136 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
137 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
138
139 #define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
140 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
141
142 #define ICMP6MSGOUT_INC_STATS(idev, field) \
143 _DEVINC(icmpv6msg, , idev, field +256)
144 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
145 _DEVINC(icmpv6msg, _BH, idev, field +256)
146 #define ICMP6MSGIN_INC_STATS(idev, field) \
147 _DEVINC(icmpv6msg, , idev, field)
148 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
149 _DEVINC(icmpv6msg, _BH, idev, field)
150
151 struct ip6_ra_chain
152 {
153 struct ip6_ra_chain *next;
154 struct sock *sk;
155 int sel;
156 void (*destructor)(struct sock *);
157 };
158
159 extern struct ip6_ra_chain *ip6_ra_chain;
160 extern rwlock_t ip6_ra_lock;
161
162 /*
163 This structure is prepared by protocol, when parsing
164 ancillary data and passed to IPv6.
165 */
166
167 struct ipv6_txoptions
168 {
169 /* Length of this structure */
170 int tot_len;
171
172 /* length of extension headers */
173
174 __u16 opt_flen; /* after fragment hdr */
175 __u16 opt_nflen; /* before fragment hdr */
176
177 struct ipv6_opt_hdr *hopopt;
178 struct ipv6_opt_hdr *dst0opt;
179 struct ipv6_rt_hdr *srcrt; /* Routing Header */
180 struct ipv6_opt_hdr *dst1opt;
181
182 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
183 };
184
185 struct ip6_flowlabel
186 {
187 struct ip6_flowlabel *next;
188 __be32 label;
189 atomic_t users;
190 struct in6_addr dst;
191 struct ipv6_txoptions *opt;
192 unsigned long linger;
193 u8 share;
194 u32 owner;
195 unsigned long lastuse;
196 unsigned long expires;
197 struct net *fl_net;
198 };
199
200 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
201 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
202
203 struct ipv6_fl_socklist
204 {
205 struct ipv6_fl_socklist *next;
206 struct ip6_flowlabel *fl;
207 };
208
209 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
210 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
211 struct ip6_flowlabel * fl,
212 struct ipv6_txoptions * fopt);
213 extern void fl6_free_socklist(struct sock *sk);
214 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
215 extern int ip6_flowlabel_init(void);
216 extern void ip6_flowlabel_cleanup(void);
217
218 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
219 {
220 if (fl)
221 atomic_dec(&fl->users);
222 }
223
224 extern int ip6_ra_control(struct sock *sk, int sel);
225
226 extern int ipv6_parse_hopopts(struct sk_buff *skb);
227
228 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
229 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
230 int newtype,
231 struct ipv6_opt_hdr __user *newopt,
232 int newoptlen);
233 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
234 struct ipv6_txoptions *opt);
235
236 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
237
238 int ip6_frag_nqueues(struct net *net);
239 int ip6_frag_mem(struct net *net);
240
241 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
242
243 extern int __ipv6_addr_type(const struct in6_addr *addr);
244 static inline int ipv6_addr_type(const struct in6_addr *addr)
245 {
246 return __ipv6_addr_type(addr) & 0xffff;
247 }
248
249 static inline int ipv6_addr_scope(const struct in6_addr *addr)
250 {
251 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
252 }
253
254 static inline int __ipv6_addr_src_scope(int type)
255 {
256 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
257 }
258
259 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
260 {
261 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
262 }
263
264 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
265 {
266 return memcmp(a1, a2, sizeof(struct in6_addr));
267 }
268
269 static inline int
270 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
271 const struct in6_addr *a2)
272 {
273 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
274 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
275 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
276 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
277 }
278
279 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
280 {
281 memcpy(a1, a2, sizeof(struct in6_addr));
282 }
283
284 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
285 const struct in6_addr *addr,
286 int plen)
287 {
288 /* caller must guarantee 0 <= plen <= 128 */
289 int o = plen >> 3,
290 b = plen & 0x7;
291
292 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
293 memcpy(pfx->s6_addr, addr, o);
294 if (b != 0)
295 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
296 }
297
298 static inline void ipv6_addr_set(struct in6_addr *addr,
299 __be32 w1, __be32 w2,
300 __be32 w3, __be32 w4)
301 {
302 addr->s6_addr32[0] = w1;
303 addr->s6_addr32[1] = w2;
304 addr->s6_addr32[2] = w3;
305 addr->s6_addr32[3] = w4;
306 }
307
308 static inline int ipv6_addr_equal(const struct in6_addr *a1,
309 const struct in6_addr *a2)
310 {
311 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
312 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
313 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
314 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
315 }
316
317 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
318 unsigned int prefixlen)
319 {
320 unsigned pdw, pbi;
321
322 /* check complete u32 in prefix */
323 pdw = prefixlen >> 5;
324 if (pdw && memcmp(a1, a2, pdw << 2))
325 return 0;
326
327 /* check incomplete u32 in prefix */
328 pbi = prefixlen & 0x1f;
329 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
330 return 0;
331
332 return 1;
333 }
334
335 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
336 const struct in6_addr *a2,
337 unsigned int prefixlen)
338 {
339 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
340 prefixlen);
341 }
342
343 struct inet_frag_queue;
344
345 struct ip6_create_arg {
346 __be32 id;
347 struct in6_addr *src;
348 struct in6_addr *dst;
349 };
350
351 void ip6_frag_init(struct inet_frag_queue *q, void *a);
352 int ip6_frag_match(struct inet_frag_queue *q, void *a);
353
354 static inline int ipv6_addr_any(const struct in6_addr *a)
355 {
356 return ((a->s6_addr32[0] | a->s6_addr32[1] |
357 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
358 }
359
360 static inline int ipv6_addr_loopback(const struct in6_addr *a)
361 {
362 return ((a->s6_addr32[0] | a->s6_addr32[1] |
363 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
364 }
365
366 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
367 {
368 return ((a->s6_addr32[0] | a->s6_addr32[1] |
369 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
370 }
371
372 /*
373 * Check for a RFC 4843 ORCHID address
374 * (Overlay Routable Cryptographic Hash Identifiers)
375 */
376 static inline int ipv6_addr_orchid(const struct in6_addr *a)
377 {
378 return ((a->s6_addr32[0] & htonl(0xfffffff0))
379 == htonl(0x20010010));
380 }
381
382 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
383 struct in6_addr *v4mapped)
384 {
385 ipv6_addr_set(v4mapped,
386 0, 0,
387 htonl(0x0000FFFF),
388 addr);
389 }
390
391 /*
392 * find the first different bit between two addresses
393 * length of address must be a multiple of 32bits
394 */
395 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
396 {
397 const __be32 *a1 = token1, *a2 = token2;
398 int i;
399
400 addrlen >>= 2;
401
402 for (i = 0; i < addrlen; i++) {
403 __be32 xb = a1[i] ^ a2[i];
404 if (xb)
405 return i * 32 + 32 - fls(ntohl(xb));
406 }
407
408 /*
409 * we should *never* get to this point since that
410 * would mean the addrs are equal
411 *
412 * However, we do get to it 8) And exacly, when
413 * addresses are equal 8)
414 *
415 * ip route add 1111::/128 via ...
416 * ip route add 1111::/64 via ...
417 * and we are here.
418 *
419 * Ideally, this function should stop comparison
420 * at prefix length. It does not, but it is still OK,
421 * if returned value is greater than prefix length.
422 * --ANK (980803)
423 */
424 return (addrlen << 5);
425 }
426
427 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
428 {
429 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
430 }
431
432 /*
433 * Prototypes exported by ipv6
434 */
435
436 /*
437 * rcv function (called from netdevice level)
438 */
439
440 extern int ipv6_rcv(struct sk_buff *skb,
441 struct net_device *dev,
442 struct packet_type *pt,
443 struct net_device *orig_dev);
444
445 extern int ip6_rcv_finish(struct sk_buff *skb);
446
447 /*
448 * upper-layer output functions
449 */
450 extern int ip6_xmit(struct sock *sk,
451 struct sk_buff *skb,
452 struct flowi *fl,
453 struct ipv6_txoptions *opt,
454 int ipfragok);
455
456 extern int ip6_nd_hdr(struct sock *sk,
457 struct sk_buff *skb,
458 struct net_device *dev,
459 const struct in6_addr *saddr,
460 const struct in6_addr *daddr,
461 int proto, int len);
462
463 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
464
465 extern int ip6_append_data(struct sock *sk,
466 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
467 void *from,
468 int length,
469 int transhdrlen,
470 int hlimit,
471 int tclass,
472 struct ipv6_txoptions *opt,
473 struct flowi *fl,
474 struct rt6_info *rt,
475 unsigned int flags);
476
477 extern int ip6_push_pending_frames(struct sock *sk);
478
479 extern void ip6_flush_pending_frames(struct sock *sk);
480
481 extern int ip6_dst_lookup(struct sock *sk,
482 struct dst_entry **dst,
483 struct flowi *fl);
484 extern int ip6_dst_blackhole(struct sock *sk,
485 struct dst_entry **dst,
486 struct flowi *fl);
487 extern int ip6_sk_dst_lookup(struct sock *sk,
488 struct dst_entry **dst,
489 struct flowi *fl);
490
491 /*
492 * skb processing functions
493 */
494
495 extern int ip6_output(struct sk_buff *skb);
496 extern int ip6_forward(struct sk_buff *skb);
497 extern int ip6_input(struct sk_buff *skb);
498 extern int ip6_mc_input(struct sk_buff *skb);
499
500 extern int __ip6_local_out(struct sk_buff *skb);
501 extern int ip6_local_out(struct sk_buff *skb);
502
503 /*
504 * Extension header (options) processing
505 */
506
507 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
508 struct ipv6_txoptions *opt,
509 u8 *proto,
510 struct in6_addr **daddr_p);
511 extern void ipv6_push_frag_opts(struct sk_buff *skb,
512 struct ipv6_txoptions *opt,
513 u8 *proto);
514
515 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
516 u8 *nexthdrp);
517
518 extern int ipv6_ext_hdr(u8 nexthdr);
519
520 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
521
522 /*
523 * socket options (ipv6_sockglue.c)
524 */
525
526 extern int ipv6_setsockopt(struct sock *sk, int level,
527 int optname,
528 char __user *optval,
529 int optlen);
530 extern int ipv6_getsockopt(struct sock *sk, int level,
531 int optname,
532 char __user *optval,
533 int __user *optlen);
534 extern int compat_ipv6_setsockopt(struct sock *sk,
535 int level,
536 int optname,
537 char __user *optval,
538 int optlen);
539 extern int compat_ipv6_getsockopt(struct sock *sk,
540 int level,
541 int optname,
542 char __user *optval,
543 int __user *optlen);
544
545 extern int ip6_datagram_connect(struct sock *sk,
546 struct sockaddr *addr, int addr_len);
547
548 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
549 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
550 u32 info, u8 *payload);
551 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
552
553 extern int inet6_release(struct socket *sock);
554 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
555 int addr_len);
556 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
557 int *uaddr_len, int peer);
558 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
559 unsigned long arg);
560
561 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
562 struct sock *sk);
563
564 /*
565 * reassembly.c
566 */
567 extern const struct proto_ops inet6_stream_ops;
568 extern const struct proto_ops inet6_dgram_ops;
569
570 struct group_source_req;
571 struct group_filter;
572
573 extern int ip6_mc_source(int add, int omode, struct sock *sk,
574 struct group_source_req *pgsr);
575 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
576 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
577 struct group_filter __user *optval,
578 int __user *optlen);
579
580 #ifdef CONFIG_PROC_FS
581 extern int ac6_proc_init(struct net *net);
582 extern void ac6_proc_exit(struct net *net);
583 extern int raw6_proc_init(void);
584 extern void raw6_proc_exit(void);
585 extern int tcp6_proc_init(struct net *net);
586 extern void tcp6_proc_exit(struct net *net);
587 extern int udp6_proc_init(struct net *net);
588 extern void udp6_proc_exit(struct net *net);
589 extern int udplite6_proc_init(void);
590 extern void udplite6_proc_exit(void);
591 extern int ipv6_misc_proc_init(void);
592 extern void ipv6_misc_proc_exit(void);
593 extern int snmp6_register_dev(struct inet6_dev *idev);
594 extern int snmp6_unregister_dev(struct inet6_dev *idev);
595
596 #else
597 static inline int ac6_proc_init(struct net *net) { return 0; }
598 static inline void ac6_proc_exit(struct net *net) { }
599 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
600 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
601 #endif
602
603 #ifdef CONFIG_SYSCTL
604 extern ctl_table ipv6_route_table_template[];
605 extern ctl_table ipv6_icmp_table_template[];
606
607 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
608 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
609 extern int ipv6_sysctl_register(void);
610 extern void ipv6_sysctl_unregister(void);
611 extern int ipv6_static_sysctl_register(void);
612 extern void ipv6_static_sysctl_unregister(void);
613 #endif
614
615 #endif /* __KERNEL__ */
616 #endif /* _NET_IPV6_H */
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