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ext4: speed-up releasing blocks on commit
[linux-2.6.git] / include / net / ipv6.h
blob64d12e77719afd26b95333a8a145b50301cef440
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 <linux/jhash.h>
19 #include <net/if_inet6.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_GRE 47 /* GRE 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
79 /*
80 * Addr scopes
81 */
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
85 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
90
91 /*
92 * Addr flags
93 */
94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
100
101 /*
102 * fragmentation header
103 */
104
105 struct frag_hdr {
106 __u8 nexthdr;
107 __u8 reserved;
108 __be16 frag_off;
109 __be32 identification;
110 };
111
112 #define IP6_MF 0x0001
113
114 #include <net/sock.h>
115
116 /* sysctls */
117 extern int sysctl_mld_max_msf;
118
119 #define _DEVINC(net, statname, modifier, idev, field) \
120 ({ \
121 struct inet6_dev *_idev = (idev); \
122 if (likely(_idev != NULL)) \
123 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
124 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
125 })
126
127 /* per device counters are atomic_long_t */
128 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
129 ({ \
130 struct inet6_dev *_idev = (idev); \
131 if (likely(_idev != NULL)) \
132 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
133 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
134 })
135
136 /* per device and per net counters are atomic_long_t */
137 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
138 ({ \
139 struct inet6_dev *_idev = (idev); \
140 if (likely(_idev != NULL)) \
141 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
142 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
143 })
144
145 #define _DEVADD(net, statname, modifier, idev, field, val) \
146 ({ \
147 struct inet6_dev *_idev = (idev); \
148 if (likely(_idev != NULL)) \
149 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
150 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
151 })
152
153 #define _DEVUPD(net, statname, modifier, idev, field, val) \
154 ({ \
155 struct inet6_dev *_idev = (idev); \
156 if (likely(_idev != NULL)) \
157 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
158 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
159 })
160
161 /* MIBs */
162
163 #define IP6_INC_STATS(net, idev,field) \
164 _DEVINC(net, ipv6, 64, idev, field)
165 #define IP6_INC_STATS_BH(net, idev,field) \
166 _DEVINC(net, ipv6, 64_BH, idev, field)
167 #define IP6_ADD_STATS(net, idev,field,val) \
168 _DEVADD(net, ipv6, 64, idev, field, val)
169 #define IP6_ADD_STATS_BH(net, idev,field,val) \
170 _DEVADD(net, ipv6, 64_BH, idev, field, val)
171 #define IP6_UPD_PO_STATS(net, idev,field,val) \
172 _DEVUPD(net, ipv6, 64, idev, field, val)
173 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
174 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
175 #define ICMP6_INC_STATS(net, idev, field) \
176 _DEVINCATOMIC(net, icmpv6, , idev, field)
177 #define ICMP6_INC_STATS_BH(net, idev, field) \
178 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
179
180 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
181 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
182 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
184 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
185 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
186
187 struct ip6_ra_chain {
188 struct ip6_ra_chain *next;
189 struct sock *sk;
190 int sel;
191 void (*destructor)(struct sock *);
192 };
193
194 extern struct ip6_ra_chain *ip6_ra_chain;
195 extern rwlock_t ip6_ra_lock;
196
197 /*
198 This structure is prepared by protocol, when parsing
199 ancillary data and passed to IPv6.
200 */
201
202 struct ipv6_txoptions {
203 /* Length of this structure */
204 int tot_len;
205
206 /* length of extension headers */
207
208 __u16 opt_flen; /* after fragment hdr */
209 __u16 opt_nflen; /* before fragment hdr */
210
211 struct ipv6_opt_hdr *hopopt;
212 struct ipv6_opt_hdr *dst0opt;
213 struct ipv6_rt_hdr *srcrt; /* Routing Header */
214 struct ipv6_opt_hdr *dst1opt;
215
216 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
217 };
218
219 struct ip6_flowlabel {
220 struct ip6_flowlabel *next;
221 __be32 label;
222 atomic_t users;
223 struct in6_addr dst;
224 struct ipv6_txoptions *opt;
225 unsigned long linger;
226 struct rcu_head rcu;
227 u8 share;
228 union {
229 struct pid *pid;
230 kuid_t uid;
231 } owner;
232 unsigned long lastuse;
233 unsigned long expires;
234 struct net *fl_net;
235 };
236
237 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
238 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
239
240 struct ipv6_fl_socklist {
241 struct ipv6_fl_socklist *next;
242 struct ip6_flowlabel *fl;
243 struct rcu_head rcu;
244 };
245
246 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
247 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
248 struct ip6_flowlabel * fl,
249 struct ipv6_txoptions * fopt);
250 extern void fl6_free_socklist(struct sock *sk);
251 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
252 extern int ip6_flowlabel_init(void);
253 extern void ip6_flowlabel_cleanup(void);
254
255 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
256 {
257 if (fl)
258 atomic_dec(&fl->users);
259 }
260
261 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
262
263 extern int ip6_ra_control(struct sock *sk, int sel);
264
265 extern int ipv6_parse_hopopts(struct sk_buff *skb);
266
267 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
268 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
269 int newtype,
270 struct ipv6_opt_hdr __user *newopt,
271 int newoptlen);
272 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
273 struct ipv6_txoptions *opt);
274
275 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
276
277 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
278 {
279 /* If forwarding is enabled, RA are not accepted unless the special
280 * hybrid mode (accept_ra=2) is enabled.
281 */
282 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
283 idev->cnf.accept_ra;
284 }
285
286 #if IS_ENABLED(CONFIG_IPV6)
287 static inline int ip6_frag_nqueues(struct net *net)
288 {
289 return net->ipv6.frags.nqueues;
290 }
291
292 static inline int ip6_frag_mem(struct net *net)
293 {
294 return sum_frag_mem_limit(&net->ipv6.frags);
295 }
296 #endif
297
298 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
299 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
300 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
301
302 extern int __ipv6_addr_type(const struct in6_addr *addr);
303 static inline int ipv6_addr_type(const struct in6_addr *addr)
304 {
305 return __ipv6_addr_type(addr) & 0xffff;
306 }
307
308 static inline int ipv6_addr_scope(const struct in6_addr *addr)
309 {
310 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
311 }
312
313 static inline int __ipv6_addr_src_scope(int type)
314 {
315 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
316 }
317
318 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
319 {
320 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
321 }
322
323 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
324 {
325 return memcmp(a1, a2, sizeof(struct in6_addr));
326 }
327
328 static inline bool
329 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
330 const struct in6_addr *a2)
331 {
332 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
333 const unsigned long *ul1 = (const unsigned long *)a1;
334 const unsigned long *ulm = (const unsigned long *)m;
335 const unsigned long *ul2 = (const unsigned long *)a2;
336
337 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
338 ((ul1[1] ^ ul2[1]) & ulm[1]));
339 #else
340 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
341 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
342 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
343 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
344 #endif
345 }
346
347 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
348 const struct in6_addr *addr,
349 int plen)
350 {
351 /* caller must guarantee 0 <= plen <= 128 */
352 int o = plen >> 3,
353 b = plen & 0x7;
354
355 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
356 memcpy(pfx->s6_addr, addr, o);
357 if (b != 0)
358 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
359 }
360
361 static inline void __ipv6_addr_set_half(__be32 *addr,
362 __be32 wh, __be32 wl)
363 {
364 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
365 #if defined(__BIG_ENDIAN)
366 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
367 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
368 return;
369 }
370 #elif defined(__LITTLE_ENDIAN)
371 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
372 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
373 return;
374 }
375 #endif
376 #endif
377 addr[0] = wh;
378 addr[1] = wl;
379 }
380
381 static inline void ipv6_addr_set(struct in6_addr *addr,
382 __be32 w1, __be32 w2,
383 __be32 w3, __be32 w4)
384 {
385 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
386 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
387 }
388
389 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
390 const struct in6_addr *a2)
391 {
392 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
393 const unsigned long *ul1 = (const unsigned long *)a1;
394 const unsigned long *ul2 = (const unsigned long *)a2;
395
396 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
397 #else
398 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
399 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
400 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
401 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
402 #endif
403 }
404
405 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
406 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
407 const __be64 *a2,
408 unsigned int len)
409 {
410 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
411 return false;
412 return true;
413 }
414
415 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
416 const struct in6_addr *addr2,
417 unsigned int prefixlen)
418 {
419 const __be64 *a1 = (const __be64 *)addr1;
420 const __be64 *a2 = (const __be64 *)addr2;
421
422 if (prefixlen >= 64) {
423 if (a1[0] ^ a2[0])
424 return false;
425 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
426 }
427 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
428 }
429 #else
430 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
431 const struct in6_addr *addr2,
432 unsigned int prefixlen)
433 {
434 const __be32 *a1 = addr1->s6_addr32;
435 const __be32 *a2 = addr2->s6_addr32;
436 unsigned int pdw, pbi;
437
438 /* check complete u32 in prefix */
439 pdw = prefixlen >> 5;
440 if (pdw && memcmp(a1, a2, pdw << 2))
441 return false;
442
443 /* check incomplete u32 in prefix */
444 pbi = prefixlen & 0x1f;
445 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
446 return false;
447
448 return true;
449 }
450 #endif
451
452 struct inet_frag_queue;
453
454 enum ip6_defrag_users {
455 IP6_DEFRAG_LOCAL_DELIVER,
456 IP6_DEFRAG_CONNTRACK_IN,
457 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
458 IP6_DEFRAG_CONNTRACK_OUT,
459 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
460 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
461 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
462 };
463
464 struct ip6_create_arg {
465 __be32 id;
466 u32 user;
467 const struct in6_addr *src;
468 const struct in6_addr *dst;
469 };
470
471 void ip6_frag_init(struct inet_frag_queue *q, void *a);
472 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
473
474 /*
475 * Equivalent of ipv4 struct ip
476 */
477 struct frag_queue {
478 struct inet_frag_queue q;
479
480 __be32 id; /* fragment id */
481 u32 user;
482 struct in6_addr saddr;
483 struct in6_addr daddr;
484
485 int iif;
486 unsigned int csum;
487 __u16 nhoffset;
488 };
489
490 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
491 struct inet_frags *frags);
492
493 static inline bool ipv6_addr_any(const struct in6_addr *a)
494 {
495 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
496 const unsigned long *ul = (const unsigned long *)a;
497
498 return (ul[0] | ul[1]) == 0UL;
499 #else
500 return (a->s6_addr32[0] | a->s6_addr32[1] |
501 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
502 #endif
503 }
504
505 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
506 {
507 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
508 const unsigned long *ul = (const unsigned long *)a;
509 unsigned long x = ul[0] ^ ul[1];
510
511 return (u32)(x ^ (x >> 32));
512 #else
513 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
514 a->s6_addr32[2] ^ a->s6_addr32[3]);
515 #endif
516 }
517
518 /* more secured version of ipv6_addr_hash() */
519 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
520 {
521 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
522
523 return jhash_3words(v,
524 (__force u32)a->s6_addr32[2],
525 (__force u32)a->s6_addr32[3],
526 ipv6_hash_secret);
527 }
528
529 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
530 {
531 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
532 const unsigned long *ul = (const unsigned long *)a;
533
534 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
535 #else
536 return (a->s6_addr32[0] | a->s6_addr32[1] |
537 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
538 #endif
539 }
540
541 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
542 {
543 return (
544 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
545 *(__be64 *)a |
546 #else
547 (a->s6_addr32[0] | a->s6_addr32[1]) |
548 #endif
549 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
550 }
551
552 /*
553 * Check for a RFC 4843 ORCHID address
554 * (Overlay Routable Cryptographic Hash Identifiers)
555 */
556 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
557 {
558 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
559 }
560
561 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
562 struct in6_addr *v4mapped)
563 {
564 ipv6_addr_set(v4mapped,
565 0, 0,
566 htonl(0x0000FFFF),
567 addr);
568 }
569
570 /*
571 * find the first different bit between two addresses
572 * length of address must be a multiple of 32bits
573 */
574 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
575 {
576 const __be32 *a1 = token1, *a2 = token2;
577 int i;
578
579 addrlen >>= 2;
580
581 for (i = 0; i < addrlen; i++) {
582 __be32 xb = a1[i] ^ a2[i];
583 if (xb)
584 return i * 32 + 31 - __fls(ntohl(xb));
585 }
586
587 /*
588 * we should *never* get to this point since that
589 * would mean the addrs are equal
590 *
591 * However, we do get to it 8) And exacly, when
592 * addresses are equal 8)
593 *
594 * ip route add 1111::/128 via ...
595 * ip route add 1111::/64 via ...
596 * and we are here.
597 *
598 * Ideally, this function should stop comparison
599 * at prefix length. It does not, but it is still OK,
600 * if returned value is greater than prefix length.
601 * --ANK (980803)
602 */
603 return addrlen << 5;
604 }
605
606 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
607 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
608 {
609 const __be64 *a1 = token1, *a2 = token2;
610 int i;
611
612 addrlen >>= 3;
613
614 for (i = 0; i < addrlen; i++) {
615 __be64 xb = a1[i] ^ a2[i];
616 if (xb)
617 return i * 64 + 63 - __fls(be64_to_cpu(xb));
618 }
619
620 return addrlen << 6;
621 }
622 #endif
623
624 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
625 {
626 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
628 return __ipv6_addr_diff64(token1, token2, addrlen);
629 #endif
630 return __ipv6_addr_diff32(token1, token2, addrlen);
631 }
632
633 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
634 {
635 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
636 }
637
638 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
639
640 /*
641 * Header manipulation
642 */
643 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
644 __be32 flowlabel)
645 {
646 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
647 }
648
649 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
650 {
651 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
652 }
653
654 /*
655 * Prototypes exported by ipv6
656 */
657
658 /*
659 * rcv function (called from netdevice level)
660 */
661
662 extern int ipv6_rcv(struct sk_buff *skb,
663 struct net_device *dev,
664 struct packet_type *pt,
665 struct net_device *orig_dev);
666
667 extern int ip6_rcv_finish(struct sk_buff *skb);
668
669 /*
670 * upper-layer output functions
671 */
672 extern int ip6_xmit(struct sock *sk,
673 struct sk_buff *skb,
674 struct flowi6 *fl6,
675 struct ipv6_txoptions *opt,
676 int tclass);
677
678 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
679
680 extern int ip6_append_data(struct sock *sk,
681 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
682 void *from,
683 int length,
684 int transhdrlen,
685 int hlimit,
686 int tclass,
687 struct ipv6_txoptions *opt,
688 struct flowi6 *fl6,
689 struct rt6_info *rt,
690 unsigned int flags,
691 int dontfrag);
692
693 extern int ip6_push_pending_frames(struct sock *sk);
694
695 extern void ip6_flush_pending_frames(struct sock *sk);
696
697 extern int ip6_dst_lookup(struct sock *sk,
698 struct dst_entry **dst,
699 struct flowi6 *fl6);
700 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
701 struct flowi6 *fl6,
702 const struct in6_addr *final_dst,
703 bool can_sleep);
704 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
705 struct flowi6 *fl6,
706 const struct in6_addr *final_dst,
707 bool can_sleep);
708 extern struct dst_entry * ip6_blackhole_route(struct net *net,
709 struct dst_entry *orig_dst);
710
711 /*
712 * skb processing functions
713 */
714
715 extern int ip6_output(struct sk_buff *skb);
716 extern int ip6_forward(struct sk_buff *skb);
717 extern int ip6_input(struct sk_buff *skb);
718 extern int ip6_mc_input(struct sk_buff *skb);
719
720 extern int __ip6_local_out(struct sk_buff *skb);
721 extern int ip6_local_out(struct sk_buff *skb);
722
723 /*
724 * Extension header (options) processing
725 */
726
727 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
728 struct ipv6_txoptions *opt,
729 u8 *proto,
730 struct in6_addr **daddr_p);
731 extern void ipv6_push_frag_opts(struct sk_buff *skb,
732 struct ipv6_txoptions *opt,
733 u8 *proto);
734
735 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
736 u8 *nexthdrp, __be16 *frag_offp);
737
738 extern bool ipv6_ext_hdr(u8 nexthdr);
739
740 enum {
741 IP6_FH_F_FRAG = (1 << 0),
742 IP6_FH_F_AUTH = (1 << 1),
743 IP6_FH_F_SKIP_RH = (1 << 2),
744 };
745
746 /* find specified header and get offset to it */
747 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
748 int target, unsigned short *fragoff, int *fragflg);
749
750 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
751
752 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
753 const struct ipv6_txoptions *opt,
754 struct in6_addr *orig);
755
756 /*
757 * socket options (ipv6_sockglue.c)
758 */
759
760 extern int ipv6_setsockopt(struct sock *sk, int level,
761 int optname,
762 char __user *optval,
763 unsigned int optlen);
764 extern int ipv6_getsockopt(struct sock *sk, int level,
765 int optname,
766 char __user *optval,
767 int __user *optlen);
768 extern int compat_ipv6_setsockopt(struct sock *sk,
769 int level,
770 int optname,
771 char __user *optval,
772 unsigned int optlen);
773 extern int compat_ipv6_getsockopt(struct sock *sk,
774 int level,
775 int optname,
776 char __user *optval,
777 int __user *optlen);
778
779 extern int ip6_datagram_connect(struct sock *sk,
780 struct sockaddr *addr, int addr_len);
781
782 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
783 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
784 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
785 u32 info, u8 *payload);
786 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
787 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
788
789 extern int inet6_release(struct socket *sock);
790 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
791 int addr_len);
792 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
793 int *uaddr_len, int peer);
794 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
795 unsigned long arg);
796
797 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
798 struct sock *sk);
799
800 /*
801 * reassembly.c
802 */
803 extern const struct proto_ops inet6_stream_ops;
804 extern const struct proto_ops inet6_dgram_ops;
805
806 struct group_source_req;
807 struct group_filter;
808
809 extern int ip6_mc_source(int add, int omode, struct sock *sk,
810 struct group_source_req *pgsr);
811 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
812 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
813 struct group_filter __user *optval,
814 int __user *optlen);
815 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
816 const struct in6_addr *daddr, u32 rnd);
817
818 #ifdef CONFIG_PROC_FS
819 extern int ac6_proc_init(struct net *net);
820 extern void ac6_proc_exit(struct net *net);
821 extern int raw6_proc_init(void);
822 extern void raw6_proc_exit(void);
823 extern int tcp6_proc_init(struct net *net);
824 extern void tcp6_proc_exit(struct net *net);
825 extern int udp6_proc_init(struct net *net);
826 extern void udp6_proc_exit(struct net *net);
827 extern int udplite6_proc_init(void);
828 extern void udplite6_proc_exit(void);
829 extern int ipv6_misc_proc_init(void);
830 extern void ipv6_misc_proc_exit(void);
831 extern int snmp6_register_dev(struct inet6_dev *idev);
832 extern int snmp6_unregister_dev(struct inet6_dev *idev);
833
834 #else
835 static inline int ac6_proc_init(struct net *net) { return 0; }
836 static inline void ac6_proc_exit(struct net *net) { }
837 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
838 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
839 #endif
840
841 #ifdef CONFIG_SYSCTL
842 extern ctl_table ipv6_route_table_template[];
843 extern ctl_table ipv6_icmp_table_template[];
844
845 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
846 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
847 extern int ipv6_sysctl_register(void);
848 extern void ipv6_sysctl_unregister(void);
849 #endif
850
851 #endif /* _NET_IPV6_H */
Linus' kernel tree