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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / include / net / ipv6.h
blob7d4130a75872213142a076ed6ba2fa38acbceb41
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_SCTP 132 /* SCTP message. */
45 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
46
47 #define NEXTHDR_MAX 255
48
49
50
51 #define IPV6_DEFAULT_HOPLIMIT 64
52 #define IPV6_DEFAULT_MCASTHOPS 1
53
54 /*
55 * Addr type
56 *
57 * type - unicast | multicast
58 * scope - local | site | global
59 * v4 - compat
60 * v4mapped
61 * any
62 * loopback
63 */
64
65 #define IPV6_ADDR_ANY 0x0000U
66
67 #define IPV6_ADDR_UNICAST 0x0001U
68 #define IPV6_ADDR_MULTICAST 0x0002U
69
70 #define IPV6_ADDR_LOOPBACK 0x0010U
71 #define IPV6_ADDR_LINKLOCAL 0x0020U
72 #define IPV6_ADDR_SITELOCAL 0x0040U
73
74 #define IPV6_ADDR_COMPATv4 0x0080U
75
76 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
77
78 #define IPV6_ADDR_MAPPED 0x1000U
79
80 /*
81 * Addr scopes
82 */
83 #define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
85 #define __IPV6_ADDR_SCOPE_INVALID -1
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 * Addr flags
94 */
95 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
96 ((a)->s6_addr[1] & 0x10)
97 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
98 ((a)->s6_addr[1] & 0x20)
99 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
100 ((a)->s6_addr[1] & 0x40)
101
102 /*
103 * fragmentation header
104 */
105
106 struct frag_hdr {
107 __u8 nexthdr;
108 __u8 reserved;
109 __be16 frag_off;
110 __be32 identification;
111 };
112
113 #define IP6_MF 0x0001
114
115 #include <net/sock.h>
116
117 /* sysctls */
118 extern int sysctl_mld_max_msf;
119
120 #define _DEVINC(net, statname, modifier, idev, field) \
121 ({ \
122 struct inet6_dev *_idev = (idev); \
123 if (likely(_idev != NULL)) \
124 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
125 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
126 })
127
128 /* per device counters are atomic_long_t */
129 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
130 ({ \
131 struct inet6_dev *_idev = (idev); \
132 if (likely(_idev != NULL)) \
133 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
134 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
135 })
136
137 /* per device and per net counters are atomic_long_t */
138 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
139 ({ \
140 struct inet6_dev *_idev = (idev); \
141 if (likely(_idev != NULL)) \
142 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
143 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
144 })
145
146 #define _DEVADD(net, statname, modifier, idev, field, val) \
147 ({ \
148 struct inet6_dev *_idev = (idev); \
149 if (likely(_idev != NULL)) \
150 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
151 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
152 })
153
154 #define _DEVUPD(net, statname, modifier, idev, field, val) \
155 ({ \
156 struct inet6_dev *_idev = (idev); \
157 if (likely(_idev != NULL)) \
158 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
159 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
160 })
161
162 /* MIBs */
163
164 #define IP6_INC_STATS(net, idev,field) \
165 _DEVINC(net, ipv6, 64, idev, field)
166 #define IP6_INC_STATS_BH(net, idev,field) \
167 _DEVINC(net, ipv6, 64_BH, idev, field)
168 #define IP6_ADD_STATS(net, idev,field,val) \
169 _DEVADD(net, ipv6, 64, idev, field, val)
170 #define IP6_ADD_STATS_BH(net, idev,field,val) \
171 _DEVADD(net, ipv6, 64_BH, idev, field, val)
172 #define IP6_UPD_PO_STATS(net, idev,field,val) \
173 _DEVUPD(net, ipv6, 64, idev, field, val)
174 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
175 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
176 #define ICMP6_INC_STATS(net, idev, field) \
177 _DEVINCATOMIC(net, icmpv6, , idev, field)
178 #define ICMP6_INC_STATS_BH(net, idev, field) \
179 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
180
181 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
183 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
185 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
187
188 struct ip6_ra_chain {
189 struct ip6_ra_chain *next;
190 struct sock *sk;
191 int sel;
192 void (*destructor)(struct sock *);
193 };
194
195 extern struct ip6_ra_chain *ip6_ra_chain;
196 extern rwlock_t ip6_ra_lock;
197
198 /*
199 This structure is prepared by protocol, when parsing
200 ancillary data and passed to IPv6.
201 */
202
203 struct ipv6_txoptions {
204 atomic_t refcnt;
205 /* Length of this structure */
206 int tot_len;
207
208 /* length of extension headers */
209
210 __u16 opt_flen; /* after fragment hdr */
211 __u16 opt_nflen; /* before fragment hdr */
212
213 struct ipv6_opt_hdr *hopopt;
214 struct ipv6_opt_hdr *dst0opt;
215 struct ipv6_rt_hdr *srcrt; /* Routing Header */
216 struct ipv6_opt_hdr *dst1opt;
217 struct rcu_head rcu;
218 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
219 };
220
221 struct ip6_flowlabel {
222 struct ip6_flowlabel __rcu *next;
223 __be32 label;
224 atomic_t users;
225 struct in6_addr dst;
226 struct ipv6_txoptions *opt;
227 unsigned long linger;
228 struct rcu_head rcu;
229 u8 share;
230 union {
231 struct pid *pid;
232 kuid_t uid;
233 } owner;
234 unsigned long lastuse;
235 unsigned long expires;
236 struct net *fl_net;
237 };
238
239 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
240 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
241
242 struct ipv6_fl_socklist {
243 struct ipv6_fl_socklist __rcu *next;
244 struct ip6_flowlabel *fl;
245 struct rcu_head rcu;
246 };
247
248 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
249 {
250 struct ipv6_txoptions *opt;
251
252 rcu_read_lock();
253 opt = rcu_dereference(np->opt);
254 if (opt && !atomic_inc_not_zero(&opt->refcnt))
255 opt = NULL;
256 rcu_read_unlock();
257 return opt;
258 }
259
260 static inline void txopt_put(struct ipv6_txoptions *opt)
261 {
262 if (opt && atomic_dec_and_test(&opt->refcnt))
263 kfree_rcu(opt, rcu);
264 }
265
266 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
267 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
268 struct ip6_flowlabel * fl,
269 struct ipv6_txoptions * fopt);
270 extern void fl6_free_socklist(struct sock *sk);
271 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
272 extern int ip6_flowlabel_init(void);
273 extern void ip6_flowlabel_cleanup(void);
274
275 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
276 {
277 if (fl)
278 atomic_dec(&fl->users);
279 }
280
281 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
282
283 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
284 struct icmp6hdr *thdr, int len);
285
286 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
287 struct sock *sk, struct flowi6 *fl6);
288
289 extern int ip6_ra_control(struct sock *sk, int sel);
290
291 extern int ipv6_parse_hopopts(struct sk_buff *skb);
292
293 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
294 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
295 int newtype,
296 struct ipv6_opt_hdr __user *newopt,
297 int newoptlen);
298 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
299 struct ipv6_txoptions *opt);
300
301 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
302
303 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
304 {
305 /* If forwarding is enabled, RA are not accepted unless the special
306 * hybrid mode (accept_ra=2) is enabled.
307 */
308 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
309 idev->cnf.accept_ra;
310 }
311
312 #if IS_ENABLED(CONFIG_IPV6)
313 static inline int ip6_frag_nqueues(struct net *net)
314 {
315 return net->ipv6.frags.nqueues;
316 }
317
318 static inline int ip6_frag_mem(struct net *net)
319 {
320 return sum_frag_mem_limit(&net->ipv6.frags);
321 }
322 #endif
323
324 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
325 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
326 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
327
328 extern int __ipv6_addr_type(const struct in6_addr *addr);
329 static inline int ipv6_addr_type(const struct in6_addr *addr)
330 {
331 return __ipv6_addr_type(addr) & 0xffff;
332 }
333
334 static inline int ipv6_addr_scope(const struct in6_addr *addr)
335 {
336 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
337 }
338
339 static inline int __ipv6_addr_src_scope(int type)
340 {
341 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
342 }
343
344 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
345 {
346 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
347 }
348
349 static inline bool __ipv6_addr_needs_scope_id(int type)
350 {
351 return type & IPV6_ADDR_LINKLOCAL ||
352 (type & IPV6_ADDR_MULTICAST &&
353 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
354 }
355
356 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
357 {
358 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
359 }
360
361 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
362 {
363 return memcmp(a1, a2, sizeof(struct in6_addr));
364 }
365
366 static inline bool
367 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
368 const struct in6_addr *a2)
369 {
370 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
371 const unsigned long *ul1 = (const unsigned long *)a1;
372 const unsigned long *ulm = (const unsigned long *)m;
373 const unsigned long *ul2 = (const unsigned long *)a2;
374
375 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
376 ((ul1[1] ^ ul2[1]) & ulm[1]));
377 #else
378 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
379 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
380 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
381 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
382 #endif
383 }
384
385 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
386 const struct in6_addr *addr,
387 int plen)
388 {
389 /* caller must guarantee 0 <= plen <= 128 */
390 int o = plen >> 3,
391 b = plen & 0x7;
392
393 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
394 memcpy(pfx->s6_addr, addr, o);
395 if (b != 0)
396 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
397 }
398
399 static inline void __ipv6_addr_set_half(__be32 *addr,
400 __be32 wh, __be32 wl)
401 {
402 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
403 #if defined(__BIG_ENDIAN)
404 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
405 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
406 return;
407 }
408 #elif defined(__LITTLE_ENDIAN)
409 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
410 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
411 return;
412 }
413 #endif
414 #endif
415 addr[0] = wh;
416 addr[1] = wl;
417 }
418
419 static inline void ipv6_addr_set(struct in6_addr *addr,
420 __be32 w1, __be32 w2,
421 __be32 w3, __be32 w4)
422 {
423 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
424 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
425 }
426
427 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
428 const struct in6_addr *a2)
429 {
430 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
431 const unsigned long *ul1 = (const unsigned long *)a1;
432 const unsigned long *ul2 = (const unsigned long *)a2;
433
434 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
435 #else
436 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
437 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
438 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
439 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
440 #endif
441 }
442
443 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
444 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
445 const __be64 *a2,
446 unsigned int len)
447 {
448 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
449 return false;
450 return true;
451 }
452
453 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
454 const struct in6_addr *addr2,
455 unsigned int prefixlen)
456 {
457 const __be64 *a1 = (const __be64 *)addr1;
458 const __be64 *a2 = (const __be64 *)addr2;
459
460 if (prefixlen >= 64) {
461 if (a1[0] ^ a2[0])
462 return false;
463 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
464 }
465 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
466 }
467 #else
468 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
469 const struct in6_addr *addr2,
470 unsigned int prefixlen)
471 {
472 const __be32 *a1 = addr1->s6_addr32;
473 const __be32 *a2 = addr2->s6_addr32;
474 unsigned int pdw, pbi;
475
476 /* check complete u32 in prefix */
477 pdw = prefixlen >> 5;
478 if (pdw && memcmp(a1, a2, pdw << 2))
479 return false;
480
481 /* check incomplete u32 in prefix */
482 pbi = prefixlen & 0x1f;
483 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
484 return false;
485
486 return true;
487 }
488 #endif
489
490 struct inet_frag_queue;
491
492 enum ip6_defrag_users {
493 IP6_DEFRAG_LOCAL_DELIVER,
494 IP6_DEFRAG_CONNTRACK_IN,
495 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
496 IP6_DEFRAG_CONNTRACK_OUT,
497 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
498 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
499 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
500 };
501
502 struct ip6_create_arg {
503 __be32 id;
504 u32 user;
505 const struct in6_addr *src;
506 const struct in6_addr *dst;
507 int iif;
508 u8 ecn;
509 };
510
511 void ip6_frag_init(struct inet_frag_queue *q, void *a);
512 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
513
514 /*
515 * Equivalent of ipv4 struct ip
516 */
517 struct frag_queue {
518 struct inet_frag_queue q;
519
520 __be32 id; /* fragment id */
521 u32 user;
522 struct in6_addr saddr;
523 struct in6_addr daddr;
524
525 int iif;
526 unsigned int csum;
527 __u16 nhoffset;
528 u8 ecn;
529 };
530
531 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
532 struct inet_frags *frags);
533
534 static inline bool ipv6_addr_any(const struct in6_addr *a)
535 {
536 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
537 const unsigned long *ul = (const unsigned long *)a;
538
539 return (ul[0] | ul[1]) == 0UL;
540 #else
541 return (a->s6_addr32[0] | a->s6_addr32[1] |
542 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
543 #endif
544 }
545
546 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
547 {
548 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
549 const unsigned long *ul = (const unsigned long *)a;
550 unsigned long x = ul[0] ^ ul[1];
551
552 return (u32)(x ^ (x >> 32));
553 #else
554 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
555 a->s6_addr32[2] ^ a->s6_addr32[3]);
556 #endif
557 }
558
559 /* more secured version of ipv6_addr_hash() */
560 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
561 {
562 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
563
564 return jhash_3words(v,
565 (__force u32)a->s6_addr32[2],
566 (__force u32)a->s6_addr32[3],
567 initval);
568 }
569
570 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
571 {
572 return __ipv6_addr_jhash(a, ipv6_hash_secret);
573 }
574
575 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
576 {
577 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
578 const unsigned long *ul = (const unsigned long *)a;
579
580 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
581 #else
582 return (a->s6_addr32[0] | a->s6_addr32[1] |
583 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
584 #endif
585 }
586
587 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
588 {
589 return (
590 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
591 *(__be64 *)a |
592 #else
593 (a->s6_addr32[0] | a->s6_addr32[1]) |
594 #endif
595 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
596 }
597
598 /*
599 * Check for a RFC 4843 ORCHID address
600 * (Overlay Routable Cryptographic Hash Identifiers)
601 */
602 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
603 {
604 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
605 }
606
607 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
608 struct in6_addr *v4mapped)
609 {
610 ipv6_addr_set(v4mapped,
611 0, 0,
612 htonl(0x0000FFFF),
613 addr);
614 }
615
616 /*
617 * find the first different bit between two addresses
618 * length of address must be a multiple of 32bits
619 */
620 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
621 {
622 const __be32 *a1 = token1, *a2 = token2;
623 int i;
624
625 addrlen >>= 2;
626
627 for (i = 0; i < addrlen; i++) {
628 __be32 xb = a1[i] ^ a2[i];
629 if (xb)
630 return i * 32 + 31 - __fls(ntohl(xb));
631 }
632
633 /*
634 * we should *never* get to this point since that
635 * would mean the addrs are equal
636 *
637 * However, we do get to it 8) And exacly, when
638 * addresses are equal 8)
639 *
640 * ip route add 1111::/128 via ...
641 * ip route add 1111::/64 via ...
642 * and we are here.
643 *
644 * Ideally, this function should stop comparison
645 * at prefix length. It does not, but it is still OK,
646 * if returned value is greater than prefix length.
647 * --ANK (980803)
648 */
649 return addrlen << 5;
650 }
651
652 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
653 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
654 {
655 const __be64 *a1 = token1, *a2 = token2;
656 int i;
657
658 addrlen >>= 3;
659
660 for (i = 0; i < addrlen; i++) {
661 __be64 xb = a1[i] ^ a2[i];
662 if (xb)
663 return i * 64 + 63 - __fls(be64_to_cpu(xb));
664 }
665
666 return addrlen << 6;
667 }
668 #endif
669
670 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
671 {
672 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
673 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
674 return __ipv6_addr_diff64(token1, token2, addrlen);
675 #endif
676 return __ipv6_addr_diff32(token1, token2, addrlen);
677 }
678
679 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
680 {
681 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
682 }
683
684 extern void ipv6_proxy_select_ident(struct sk_buff *skb);
685
686 extern int ip6_dst_hoplimit(struct dst_entry *dst);
687
688 /*
689 * Header manipulation
690 */
691 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
692 __be32 flowlabel)
693 {
694 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
695 }
696
697 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
698 {
699 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
700 }
701
702 /*
703 * Prototypes exported by ipv6
704 */
705
706 /*
707 * rcv function (called from netdevice level)
708 */
709
710 extern int ipv6_rcv(struct sk_buff *skb,
711 struct net_device *dev,
712 struct packet_type *pt,
713 struct net_device *orig_dev);
714
715 extern int ip6_rcv_finish(struct sk_buff *skb);
716
717 /*
718 * upper-layer output functions
719 */
720 extern int ip6_xmit(struct sock *sk,
721 struct sk_buff *skb,
722 struct flowi6 *fl6,
723 struct ipv6_txoptions *opt,
724 int tclass);
725
726 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
727
728 extern int ip6_append_data(struct sock *sk,
729 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
730 void *from,
731 int length,
732 int transhdrlen,
733 int hlimit,
734 int tclass,
735 struct ipv6_txoptions *opt,
736 struct flowi6 *fl6,
737 struct rt6_info *rt,
738 unsigned int flags,
739 int dontfrag);
740
741 extern int ip6_push_pending_frames(struct sock *sk);
742
743 extern void ip6_flush_pending_frames(struct sock *sk);
744
745 extern int ip6_dst_lookup(struct sock *sk,
746 struct dst_entry **dst,
747 struct flowi6 *fl6);
748 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
749 struct flowi6 *fl6,
750 const struct in6_addr *final_dst,
751 bool can_sleep);
752 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
753 struct flowi6 *fl6,
754 const struct in6_addr *final_dst,
755 bool can_sleep);
756 extern struct dst_entry * ip6_blackhole_route(struct net *net,
757 struct dst_entry *orig_dst);
758
759 /*
760 * skb processing functions
761 */
762
763 extern int ip6_output(struct sk_buff *skb);
764 extern int ip6_forward(struct sk_buff *skb);
765 extern int ip6_input(struct sk_buff *skb);
766 extern int ip6_mc_input(struct sk_buff *skb);
767
768 extern int __ip6_local_out(struct sk_buff *skb);
769 extern int ip6_local_out(struct sk_buff *skb);
770
771 /*
772 * Extension header (options) processing
773 */
774
775 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
776 struct ipv6_txoptions *opt,
777 u8 *proto,
778 struct in6_addr **daddr_p);
779 extern void ipv6_push_frag_opts(struct sk_buff *skb,
780 struct ipv6_txoptions *opt,
781 u8 *proto);
782
783 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
784 u8 *nexthdrp, __be16 *frag_offp);
785
786 extern bool ipv6_ext_hdr(u8 nexthdr);
787
788 enum {
789 IP6_FH_F_FRAG = (1 << 0),
790 IP6_FH_F_AUTH = (1 << 1),
791 IP6_FH_F_SKIP_RH = (1 << 2),
792 };
793
794 /* find specified header and get offset to it */
795 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
796 int target, unsigned short *fragoff, int *fragflg);
797
798 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
799
800 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
801 const struct ipv6_txoptions *opt,
802 struct in6_addr *orig);
803
804 /*
805 * socket options (ipv6_sockglue.c)
806 */
807
808 extern int ipv6_setsockopt(struct sock *sk, int level,
809 int optname,
810 char __user *optval,
811 unsigned int optlen);
812 extern int ipv6_getsockopt(struct sock *sk, int level,
813 int optname,
814 char __user *optval,
815 int __user *optlen);
816 extern int compat_ipv6_setsockopt(struct sock *sk,
817 int level,
818 int optname,
819 char __user *optval,
820 unsigned int optlen);
821 extern int compat_ipv6_getsockopt(struct sock *sk,
822 int level,
823 int optname,
824 char __user *optval,
825 int __user *optlen);
826
827 extern int ip6_datagram_connect(struct sock *sk,
828 struct sockaddr *addr, int addr_len);
829
830 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
831 int *addr_len);
832 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
833 int *addr_len);
834 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
835 u32 info, u8 *payload);
836 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
837 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
838
839 extern int inet6_release(struct socket *sock);
840 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
841 int addr_len);
842 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
843 int *uaddr_len, int peer);
844 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
845 unsigned long arg);
846
847 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
848 struct sock *sk);
849
850 /*
851 * reassembly.c
852 */
853 extern const struct proto_ops inet6_stream_ops;
854 extern const struct proto_ops inet6_dgram_ops;
855
856 struct group_source_req;
857 struct group_filter;
858
859 extern int ip6_mc_source(int add, int omode, struct sock *sk,
860 struct group_source_req *pgsr);
861 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
862 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
863 struct group_filter __user *optval,
864 int __user *optlen);
865 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
866 const struct in6_addr *daddr, u32 rnd);
867
868 #ifdef CONFIG_PROC_FS
869 extern int ac6_proc_init(struct net *net);
870 extern void ac6_proc_exit(struct net *net);
871 extern int raw6_proc_init(void);
872 extern void raw6_proc_exit(void);
873 extern int tcp6_proc_init(struct net *net);
874 extern void tcp6_proc_exit(struct net *net);
875 extern int udp6_proc_init(struct net *net);
876 extern void udp6_proc_exit(struct net *net);
877 extern int udplite6_proc_init(void);
878 extern void udplite6_proc_exit(void);
879 extern int ipv6_misc_proc_init(void);
880 extern void ipv6_misc_proc_exit(void);
881 extern int snmp6_register_dev(struct inet6_dev *idev);
882 extern int snmp6_unregister_dev(struct inet6_dev *idev);
883
884 #else
885 static inline int ac6_proc_init(struct net *net) { return 0; }
886 static inline void ac6_proc_exit(struct net *net) { }
887 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
888 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
889 #endif
890
891 #ifdef CONFIG_SYSCTL
892 extern struct ctl_table ipv6_route_table_template[];
893 extern struct ctl_table ipv6_icmp_table_template[];
894
895 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
896 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
897 extern int ipv6_sysctl_register(void);
898 extern void ipv6_sysctl_unregister(void);
899 #endif
900
901 #endif /* _NET_IPV6_H */
Linux with added FPC-III support