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crypto: user - constify netlink dispatch table
[linux-2.6.git] / include / net / ipv6.h
blob851d5412a299ba95510305f35cf45bdd7b55dbdc
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_GRE 47 /* GRE 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 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
44
45 #define NEXTHDR_MAX 255
46
47
48
49 #define IPV6_DEFAULT_HOPLIMIT 64
50 #define IPV6_DEFAULT_MCASTHOPS 1
51
52 /*
53 * Addr type
54 *
55 * type - unicast | multicast
56 * scope - local | site | global
57 * v4 - compat
58 * v4mapped
59 * any
60 * loopback
61 */
62
63 #define IPV6_ADDR_ANY 0x0000U
64
65 #define IPV6_ADDR_UNICAST 0x0001U
66 #define IPV6_ADDR_MULTICAST 0x0002U
67
68 #define IPV6_ADDR_LOOPBACK 0x0010U
69 #define IPV6_ADDR_LINKLOCAL 0x0020U
70 #define IPV6_ADDR_SITELOCAL 0x0040U
71
72 #define IPV6_ADDR_COMPATv4 0x0080U
73
74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
75
76 #define IPV6_ADDR_MAPPED 0x1000U
77
78 /*
79 * Addr scopes
80 */
81 #define IPV6_ADDR_MC_SCOPE(a) \
82 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
83 #define __IPV6_ADDR_SCOPE_INVALID -1
84 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
85 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
86 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
87 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
88 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
89
90 /*
91 * Addr flags
92 */
93 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
94 ((a)->s6_addr[1] & 0x10)
95 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
96 ((a)->s6_addr[1] & 0x20)
97 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
98 ((a)->s6_addr[1] & 0x40)
99
100 /*
101 * fragmentation header
102 */
103
104 struct frag_hdr {
105 __u8 nexthdr;
106 __u8 reserved;
107 __be16 frag_off;
108 __be32 identification;
109 };
110
111 #define IP6_MF 0x0001
112
113 #include <net/sock.h>
114
115 /* sysctls */
116 extern int sysctl_mld_max_msf;
117
118 #define _DEVINC(net, statname, modifier, idev, field) \
119 ({ \
120 struct inet6_dev *_idev = (idev); \
121 if (likely(_idev != NULL)) \
122 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
123 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
124 })
125
126 /* per device counters are atomic_long_t */
127 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
128 ({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
132 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133 })
134
135 /* per device and per net counters are atomic_long_t */
136 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
137 ({ \
138 struct inet6_dev *_idev = (idev); \
139 if (likely(_idev != NULL)) \
140 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
141 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
142 })
143
144 #define _DEVADD(net, statname, modifier, idev, field, val) \
145 ({ \
146 struct inet6_dev *_idev = (idev); \
147 if (likely(_idev != NULL)) \
148 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
149 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
150 })
151
152 #define _DEVUPD(net, statname, modifier, idev, field, val) \
153 ({ \
154 struct inet6_dev *_idev = (idev); \
155 if (likely(_idev != NULL)) \
156 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
157 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
158 })
159
160 /* MIBs */
161
162 #define IP6_INC_STATS(net, idev,field) \
163 _DEVINC(net, ipv6, 64, idev, field)
164 #define IP6_INC_STATS_BH(net, idev,field) \
165 _DEVINC(net, ipv6, 64_BH, idev, field)
166 #define IP6_ADD_STATS(net, idev,field,val) \
167 _DEVADD(net, ipv6, 64, idev, field, val)
168 #define IP6_ADD_STATS_BH(net, idev,field,val) \
169 _DEVADD(net, ipv6, 64_BH, idev, field, val)
170 #define IP6_UPD_PO_STATS(net, idev,field,val) \
171 _DEVUPD(net, ipv6, 64, idev, field, val)
172 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
173 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
174 #define ICMP6_INC_STATS(net, idev, field) \
175 _DEVINCATOMIC(net, icmpv6, , idev, field)
176 #define ICMP6_INC_STATS_BH(net, idev, field) \
177 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
178
179 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
180 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
181 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
183 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
185
186 struct ip6_ra_chain {
187 struct ip6_ra_chain *next;
188 struct sock *sk;
189 int sel;
190 void (*destructor)(struct sock *);
191 };
192
193 extern struct ip6_ra_chain *ip6_ra_chain;
194 extern rwlock_t ip6_ra_lock;
195
196 /*
197 This structure is prepared by protocol, when parsing
198 ancillary data and passed to IPv6.
199 */
200
201 struct ipv6_txoptions {
202 /* Length of this structure */
203 int tot_len;
204
205 /* length of extension headers */
206
207 __u16 opt_flen; /* after fragment hdr */
208 __u16 opt_nflen; /* before fragment hdr */
209
210 struct ipv6_opt_hdr *hopopt;
211 struct ipv6_opt_hdr *dst0opt;
212 struct ipv6_rt_hdr *srcrt; /* Routing Header */
213 struct ipv6_opt_hdr *dst1opt;
214
215 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
216 };
217
218 struct ip6_flowlabel {
219 struct ip6_flowlabel *next;
220 __be32 label;
221 atomic_t users;
222 struct in6_addr dst;
223 struct ipv6_txoptions *opt;
224 unsigned long linger;
225 struct rcu_head rcu;
226 u8 share;
227 union {
228 struct pid *pid;
229 kuid_t uid;
230 } owner;
231 unsigned long lastuse;
232 unsigned long expires;
233 struct net *fl_net;
234 };
235
236 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
237 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
238
239 struct ipv6_fl_socklist {
240 struct ipv6_fl_socklist *next;
241 struct ip6_flowlabel *fl;
242 struct rcu_head rcu;
243 };
244
245 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
246 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
247 struct ip6_flowlabel * fl,
248 struct ipv6_txoptions * fopt);
249 extern void fl6_free_socklist(struct sock *sk);
250 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
251 extern int ip6_flowlabel_init(void);
252 extern void ip6_flowlabel_cleanup(void);
253
254 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
255 {
256 if (fl)
257 atomic_dec(&fl->users);
258 }
259
260 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
261
262 extern int ip6_ra_control(struct sock *sk, int sel);
263
264 extern int ipv6_parse_hopopts(struct sk_buff *skb);
265
266 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
267 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
268 int newtype,
269 struct ipv6_opt_hdr __user *newopt,
270 int newoptlen);
271 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
272 struct ipv6_txoptions *opt);
273
274 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
275
276 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
277 {
278 /* If forwarding is enabled, RA are not accepted unless the special
279 * hybrid mode (accept_ra=2) is enabled.
280 */
281 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
282 idev->cnf.accept_ra;
283 }
284
285 #if IS_ENABLED(CONFIG_IPV6)
286 static inline int ip6_frag_nqueues(struct net *net)
287 {
288 return net->ipv6.frags.nqueues;
289 }
290
291 static inline int ip6_frag_mem(struct net *net)
292 {
293 return sum_frag_mem_limit(&net->ipv6.frags);
294 }
295 #endif
296
297 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
298 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
299 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
300
301 extern int __ipv6_addr_type(const struct in6_addr *addr);
302 static inline int ipv6_addr_type(const struct in6_addr *addr)
303 {
304 return __ipv6_addr_type(addr) & 0xffff;
305 }
306
307 static inline int ipv6_addr_scope(const struct in6_addr *addr)
308 {
309 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
310 }
311
312 static inline int __ipv6_addr_src_scope(int type)
313 {
314 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
315 }
316
317 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
318 {
319 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
320 }
321
322 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
323 {
324 return memcmp(a1, a2, sizeof(struct in6_addr));
325 }
326
327 static inline bool
328 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
329 const struct in6_addr *a2)
330 {
331 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
332 const unsigned long *ul1 = (const unsigned long *)a1;
333 const unsigned long *ulm = (const unsigned long *)m;
334 const unsigned long *ul2 = (const unsigned long *)a2;
335
336 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
337 ((ul1[1] ^ ul2[1]) & ulm[1]));
338 #else
339 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
340 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
341 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
342 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
343 #endif
344 }
345
346 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
347 const struct in6_addr *addr,
348 int plen)
349 {
350 /* caller must guarantee 0 <= plen <= 128 */
351 int o = plen >> 3,
352 b = plen & 0x7;
353
354 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
355 memcpy(pfx->s6_addr, addr, o);
356 if (b != 0)
357 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
358 }
359
360 static inline void __ipv6_addr_set_half(__be32 *addr,
361 __be32 wh, __be32 wl)
362 {
363 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
364 #if defined(__BIG_ENDIAN)
365 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
366 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
367 return;
368 }
369 #elif defined(__LITTLE_ENDIAN)
370 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
371 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
372 return;
373 }
374 #endif
375 #endif
376 addr[0] = wh;
377 addr[1] = wl;
378 }
379
380 static inline void ipv6_addr_set(struct in6_addr *addr,
381 __be32 w1, __be32 w2,
382 __be32 w3, __be32 w4)
383 {
384 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
385 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
386 }
387
388 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
389 const struct in6_addr *a2)
390 {
391 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
392 const unsigned long *ul1 = (const unsigned long *)a1;
393 const unsigned long *ul2 = (const unsigned long *)a2;
394
395 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
396 #else
397 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
398 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
399 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
400 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
401 #endif
402 }
403
404 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
405 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
406 const __be64 *a2,
407 unsigned int len)
408 {
409 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
410 return false;
411 return true;
412 }
413
414 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
415 const struct in6_addr *addr2,
416 unsigned int prefixlen)
417 {
418 const __be64 *a1 = (const __be64 *)addr1;
419 const __be64 *a2 = (const __be64 *)addr2;
420
421 if (prefixlen >= 64) {
422 if (a1[0] ^ a2[0])
423 return false;
424 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
425 }
426 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
427 }
428 #else
429 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
430 const struct in6_addr *addr2,
431 unsigned int prefixlen)
432 {
433 const __be32 *a1 = addr1->s6_addr32;
434 const __be32 *a2 = addr2->s6_addr32;
435 unsigned int pdw, pbi;
436
437 /* check complete u32 in prefix */
438 pdw = prefixlen >> 5;
439 if (pdw && memcmp(a1, a2, pdw << 2))
440 return false;
441
442 /* check incomplete u32 in prefix */
443 pbi = prefixlen & 0x1f;
444 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
445 return false;
446
447 return true;
448 }
449 #endif
450
451 struct inet_frag_queue;
452
453 enum ip6_defrag_users {
454 IP6_DEFRAG_LOCAL_DELIVER,
455 IP6_DEFRAG_CONNTRACK_IN,
456 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
457 IP6_DEFRAG_CONNTRACK_OUT,
458 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
459 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
460 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
461 };
462
463 struct ip6_create_arg {
464 __be32 id;
465 u32 user;
466 const struct in6_addr *src;
467 const struct in6_addr *dst;
468 };
469
470 void ip6_frag_init(struct inet_frag_queue *q, void *a);
471 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
472
473 /*
474 * Equivalent of ipv4 struct ip
475 */
476 struct frag_queue {
477 struct inet_frag_queue q;
478
479 __be32 id; /* fragment id */
480 u32 user;
481 struct in6_addr saddr;
482 struct in6_addr daddr;
483
484 int iif;
485 unsigned int csum;
486 __u16 nhoffset;
487 };
488
489 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
490 struct inet_frags *frags);
491
492 static inline bool ipv6_addr_any(const struct in6_addr *a)
493 {
494 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
495 const unsigned long *ul = (const unsigned long *)a;
496
497 return (ul[0] | ul[1]) == 0UL;
498 #else
499 return (a->s6_addr32[0] | a->s6_addr32[1] |
500 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
501 #endif
502 }
503
504 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
505 {
506 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
507 const unsigned long *ul = (const unsigned long *)a;
508 unsigned long x = ul[0] ^ ul[1];
509
510 return (u32)(x ^ (x >> 32));
511 #else
512 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
513 a->s6_addr32[2] ^ a->s6_addr32[3]);
514 #endif
515 }
516
517 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
518 {
519 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
520 const unsigned long *ul = (const unsigned long *)a;
521
522 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
523 #else
524 return (a->s6_addr32[0] | a->s6_addr32[1] |
525 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
526 #endif
527 }
528
529 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
530 {
531 return (
532 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
533 *(__be64 *)a |
534 #else
535 (a->s6_addr32[0] | a->s6_addr32[1]) |
536 #endif
537 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
538 }
539
540 /*
541 * Check for a RFC 4843 ORCHID address
542 * (Overlay Routable Cryptographic Hash Identifiers)
543 */
544 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
545 {
546 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
547 }
548
549 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
550 struct in6_addr *v4mapped)
551 {
552 ipv6_addr_set(v4mapped,
553 0, 0,
554 htonl(0x0000FFFF),
555 addr);
556 }
557
558 /*
559 * find the first different bit between two addresses
560 * length of address must be a multiple of 32bits
561 */
562 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
563 {
564 const __be32 *a1 = token1, *a2 = token2;
565 int i;
566
567 addrlen >>= 2;
568
569 for (i = 0; i < addrlen; i++) {
570 __be32 xb = a1[i] ^ a2[i];
571 if (xb)
572 return i * 32 + 31 - __fls(ntohl(xb));
573 }
574
575 /*
576 * we should *never* get to this point since that
577 * would mean the addrs are equal
578 *
579 * However, we do get to it 8) And exacly, when
580 * addresses are equal 8)
581 *
582 * ip route add 1111::/128 via ...
583 * ip route add 1111::/64 via ...
584 * and we are here.
585 *
586 * Ideally, this function should stop comparison
587 * at prefix length. It does not, but it is still OK,
588 * if returned value is greater than prefix length.
589 * --ANK (980803)
590 */
591 return addrlen << 5;
592 }
593
594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
595 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
596 {
597 const __be64 *a1 = token1, *a2 = token2;
598 int i;
599
600 addrlen >>= 3;
601
602 for (i = 0; i < addrlen; i++) {
603 __be64 xb = a1[i] ^ a2[i];
604 if (xb)
605 return i * 64 + 63 - __fls(be64_to_cpu(xb));
606 }
607
608 return addrlen << 6;
609 }
610 #endif
611
612 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
613 {
614 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
615 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
616 return __ipv6_addr_diff64(token1, token2, addrlen);
617 #endif
618 return __ipv6_addr_diff32(token1, token2, addrlen);
619 }
620
621 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
622 {
623 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
624 }
625
626 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
627
628 /*
629 * Header manipulation
630 */
631 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
632 __be32 flowlabel)
633 {
634 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
635 }
636
637 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
638 {
639 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
640 }
641
642 /*
643 * Prototypes exported by ipv6
644 */
645
646 /*
647 * rcv function (called from netdevice level)
648 */
649
650 extern int ipv6_rcv(struct sk_buff *skb,
651 struct net_device *dev,
652 struct packet_type *pt,
653 struct net_device *orig_dev);
654
655 extern int ip6_rcv_finish(struct sk_buff *skb);
656
657 /*
658 * upper-layer output functions
659 */
660 extern int ip6_xmit(struct sock *sk,
661 struct sk_buff *skb,
662 struct flowi6 *fl6,
663 struct ipv6_txoptions *opt,
664 int tclass);
665
666 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
667
668 extern int ip6_append_data(struct sock *sk,
669 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
670 void *from,
671 int length,
672 int transhdrlen,
673 int hlimit,
674 int tclass,
675 struct ipv6_txoptions *opt,
676 struct flowi6 *fl6,
677 struct rt6_info *rt,
678 unsigned int flags,
679 int dontfrag);
680
681 extern int ip6_push_pending_frames(struct sock *sk);
682
683 extern void ip6_flush_pending_frames(struct sock *sk);
684
685 extern int ip6_dst_lookup(struct sock *sk,
686 struct dst_entry **dst,
687 struct flowi6 *fl6);
688 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
689 struct flowi6 *fl6,
690 const struct in6_addr *final_dst,
691 bool can_sleep);
692 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
693 struct flowi6 *fl6,
694 const struct in6_addr *final_dst,
695 bool can_sleep);
696 extern struct dst_entry * ip6_blackhole_route(struct net *net,
697 struct dst_entry *orig_dst);
698
699 /*
700 * skb processing functions
701 */
702
703 extern int ip6_output(struct sk_buff *skb);
704 extern int ip6_forward(struct sk_buff *skb);
705 extern int ip6_input(struct sk_buff *skb);
706 extern int ip6_mc_input(struct sk_buff *skb);
707
708 extern int __ip6_local_out(struct sk_buff *skb);
709 extern int ip6_local_out(struct sk_buff *skb);
710
711 /*
712 * Extension header (options) processing
713 */
714
715 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
716 struct ipv6_txoptions *opt,
717 u8 *proto,
718 struct in6_addr **daddr_p);
719 extern void ipv6_push_frag_opts(struct sk_buff *skb,
720 struct ipv6_txoptions *opt,
721 u8 *proto);
722
723 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
724 u8 *nexthdrp, __be16 *frag_offp);
725
726 extern bool ipv6_ext_hdr(u8 nexthdr);
727
728 enum {
729 IP6_FH_F_FRAG = (1 << 0),
730 IP6_FH_F_AUTH = (1 << 1),
731 IP6_FH_F_SKIP_RH = (1 << 2),
732 };
733
734 /* find specified header and get offset to it */
735 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
736 int target, unsigned short *fragoff, int *fragflg);
737
738 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
739
740 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
741 const struct ipv6_txoptions *opt,
742 struct in6_addr *orig);
743
744 /*
745 * socket options (ipv6_sockglue.c)
746 */
747
748 extern int ipv6_setsockopt(struct sock *sk, int level,
749 int optname,
750 char __user *optval,
751 unsigned int optlen);
752 extern int ipv6_getsockopt(struct sock *sk, int level,
753 int optname,
754 char __user *optval,
755 int __user *optlen);
756 extern int compat_ipv6_setsockopt(struct sock *sk,
757 int level,
758 int optname,
759 char __user *optval,
760 unsigned int optlen);
761 extern int compat_ipv6_getsockopt(struct sock *sk,
762 int level,
763 int optname,
764 char __user *optval,
765 int __user *optlen);
766
767 extern int ip6_datagram_connect(struct sock *sk,
768 struct sockaddr *addr, int addr_len);
769
770 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
771 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
772 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
773 u32 info, u8 *payload);
774 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
775 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
776
777 extern int inet6_release(struct socket *sock);
778 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
779 int addr_len);
780 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
781 int *uaddr_len, int peer);
782 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
783 unsigned long arg);
784
785 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
786 struct sock *sk);
787
788 /*
789 * reassembly.c
790 */
791 extern const struct proto_ops inet6_stream_ops;
792 extern const struct proto_ops inet6_dgram_ops;
793
794 struct group_source_req;
795 struct group_filter;
796
797 extern int ip6_mc_source(int add, int omode, struct sock *sk,
798 struct group_source_req *pgsr);
799 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
800 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
801 struct group_filter __user *optval,
802 int __user *optlen);
803 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
804 const struct in6_addr *daddr, u32 rnd);
805
806 #ifdef CONFIG_PROC_FS
807 extern int ac6_proc_init(struct net *net);
808 extern void ac6_proc_exit(struct net *net);
809 extern int raw6_proc_init(void);
810 extern void raw6_proc_exit(void);
811 extern int tcp6_proc_init(struct net *net);
812 extern void tcp6_proc_exit(struct net *net);
813 extern int udp6_proc_init(struct net *net);
814 extern void udp6_proc_exit(struct net *net);
815 extern int udplite6_proc_init(void);
816 extern void udplite6_proc_exit(void);
817 extern int ipv6_misc_proc_init(void);
818 extern void ipv6_misc_proc_exit(void);
819 extern int snmp6_register_dev(struct inet6_dev *idev);
820 extern int snmp6_unregister_dev(struct inet6_dev *idev);
821
822 #else
823 static inline int ac6_proc_init(struct net *net) { return 0; }
824 static inline void ac6_proc_exit(struct net *net) { }
825 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
826 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
827 #endif
828
829 #ifdef CONFIG_SYSCTL
830 extern ctl_table ipv6_route_table_template[];
831 extern ctl_table ipv6_icmp_table_template[];
832
833 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
834 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
835 extern int ipv6_sysctl_register(void);
836 extern void ipv6_sysctl_unregister(void);
837 #endif
838
839 #endif /* _NET_IPV6_H */
Linus' kernel tree