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Merge tag 'v3.10.88' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / ipv6.h
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 #define IP6_REPLY_MARK(net, mark) \
115 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
116
117 #include <net/sock.h>
118
119 /* sysctls */
120 extern int sysctl_mld_max_msf;
121
122 #define _DEVINC(net, statname, modifier, idev, field) \
123 ({ \
124 struct inet6_dev *_idev = (idev); \
125 if (likely(_idev != NULL)) \
126 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
127 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
128 })
129
130 /* per device counters are atomic_long_t */
131 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
132 ({ \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
136 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
137 })
138
139 /* per device and per net counters are atomic_long_t */
140 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
141 ({ \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
145 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
146 })
147
148 #define _DEVADD(net, statname, modifier, idev, field, val) \
149 ({ \
150 struct inet6_dev *_idev = (idev); \
151 if (likely(_idev != NULL)) \
152 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
153 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
154 })
155
156 #define _DEVUPD(net, statname, modifier, idev, field, val) \
157 ({ \
158 struct inet6_dev *_idev = (idev); \
159 if (likely(_idev != NULL)) \
160 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
161 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
162 })
163
164 /* MIBs */
165
166 #define IP6_INC_STATS(net, idev,field) \
167 _DEVINC(net, ipv6, 64, idev, field)
168 #define IP6_INC_STATS_BH(net, idev,field) \
169 _DEVINC(net, ipv6, 64_BH, idev, field)
170 #define IP6_ADD_STATS(net, idev,field,val) \
171 _DEVADD(net, ipv6, 64, idev, field, val)
172 #define IP6_ADD_STATS_BH(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64_BH, idev, field, val)
174 #define IP6_UPD_PO_STATS(net, idev,field,val) \
175 _DEVUPD(net, ipv6, 64, idev, field, val)
176 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
178 #define ICMP6_INC_STATS(net, idev, field) \
179 _DEVINCATOMIC(net, icmpv6, , idev, field)
180 #define ICMP6_INC_STATS_BH(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
182
183 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
185 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
189
190 struct ip6_ra_chain {
191 struct ip6_ra_chain *next;
192 struct sock *sk;
193 int sel;
194 void (*destructor)(struct sock *);
195 };
196
197 extern struct ip6_ra_chain *ip6_ra_chain;
198 extern rwlock_t ip6_ra_lock;
199
200 /*
201 This structure is prepared by protocol, when parsing
202 ancillary data and passed to IPv6.
203 */
204
205 struct ipv6_txoptions {
206 /* Length of this structure */
207 int tot_len;
208
209 /* length of extension headers */
210
211 __u16 opt_flen; /* after fragment hdr */
212 __u16 opt_nflen; /* before fragment hdr */
213
214 struct ipv6_opt_hdr *hopopt;
215 struct ipv6_opt_hdr *dst0opt;
216 struct ipv6_rt_hdr *srcrt; /* Routing Header */
217 struct ipv6_opt_hdr *dst1opt;
218
219 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
220 };
221
222 struct ip6_flowlabel {
223 struct ip6_flowlabel __rcu *next;
224 __be32 label;
225 atomic_t users;
226 struct in6_addr dst;
227 struct ipv6_txoptions *opt;
228 unsigned long linger;
229 struct rcu_head rcu;
230 u8 share;
231 union {
232 struct pid *pid;
233 kuid_t uid;
234 } owner;
235 unsigned long lastuse;
236 unsigned long expires;
237 struct net *fl_net;
238 };
239
240 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
241 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
242
243 struct ipv6_fl_socklist {
244 struct ipv6_fl_socklist __rcu *next;
245 struct ip6_flowlabel *fl;
246 struct rcu_head rcu;
247 };
248
249 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
250 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
251 struct ip6_flowlabel * fl,
252 struct ipv6_txoptions * fopt);
253 extern void fl6_free_socklist(struct sock *sk);
254 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
255 extern int ip6_flowlabel_init(void);
256 extern void ip6_flowlabel_cleanup(void);
257
258 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
259 {
260 if (fl)
261 atomic_dec(&fl->users);
262 }
263
264 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
265
266 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
267 struct icmp6hdr *thdr, int len);
268
269 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
270 struct sock *sk, struct flowi6 *fl6);
271
272 extern int ip6_ra_control(struct sock *sk, int sel);
273
274 extern int ipv6_parse_hopopts(struct sk_buff *skb);
275
276 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
277 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
278 int newtype,
279 struct ipv6_opt_hdr __user *newopt,
280 int newoptlen);
281 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
282 struct ipv6_txoptions *opt);
283
284 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
285
286 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
287 {
288 /* If forwarding is enabled, RA are not accepted unless the special
289 * hybrid mode (accept_ra=2) is enabled.
290 */
291 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
292 idev->cnf.accept_ra;
293 }
294
295 #if IS_ENABLED(CONFIG_IPV6)
296 static inline int ip6_frag_nqueues(struct net *net)
297 {
298 return net->ipv6.frags.nqueues;
299 }
300
301 static inline int ip6_frag_mem(struct net *net)
302 {
303 return sum_frag_mem_limit(&net->ipv6.frags);
304 }
305 #endif
306
307 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
308 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
309 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
310
311 extern int __ipv6_addr_type(const struct in6_addr *addr);
312 static inline int ipv6_addr_type(const struct in6_addr *addr)
313 {
314 return __ipv6_addr_type(addr) & 0xffff;
315 }
316
317 static inline int ipv6_addr_scope(const struct in6_addr *addr)
318 {
319 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
320 }
321
322 static inline int __ipv6_addr_src_scope(int type)
323 {
324 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
325 }
326
327 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
328 {
329 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
330 }
331
332 static inline bool __ipv6_addr_needs_scope_id(int type)
333 {
334 return type & IPV6_ADDR_LINKLOCAL ||
335 (type & IPV6_ADDR_MULTICAST &&
336 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
337 }
338
339 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
340 {
341 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
342 }
343
344 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
345 {
346 return memcmp(a1, a2, sizeof(struct in6_addr));
347 }
348
349 static inline bool
350 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
351 const struct in6_addr *a2)
352 {
353 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
354 const unsigned long *ul1 = (const unsigned long *)a1;
355 const unsigned long *ulm = (const unsigned long *)m;
356 const unsigned long *ul2 = (const unsigned long *)a2;
357
358 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
359 ((ul1[1] ^ ul2[1]) & ulm[1]));
360 #else
361 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
362 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
363 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
364 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
365 #endif
366 }
367
368 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
369 const struct in6_addr *addr,
370 int plen)
371 {
372 /* caller must guarantee 0 <= plen <= 128 */
373 int o = plen >> 3,
374 b = plen & 0x7;
375
376 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
377 memcpy(pfx->s6_addr, addr, o);
378 if (b != 0)
379 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
380 }
381
382 static inline void __ipv6_addr_set_half(__be32 *addr,
383 __be32 wh, __be32 wl)
384 {
385 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
386 #if defined(__BIG_ENDIAN)
387 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
388 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
389 return;
390 }
391 #elif defined(__LITTLE_ENDIAN)
392 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
393 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
394 return;
395 }
396 #endif
397 #endif
398 addr[0] = wh;
399 addr[1] = wl;
400 }
401
402 static inline void ipv6_addr_set(struct in6_addr *addr,
403 __be32 w1, __be32 w2,
404 __be32 w3, __be32 w4)
405 {
406 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
407 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
408 }
409
410 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
411 const struct in6_addr *a2)
412 {
413 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
414 const unsigned long *ul1 = (const unsigned long *)a1;
415 const unsigned long *ul2 = (const unsigned long *)a2;
416
417 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
418 #else
419 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
420 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
421 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
422 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
423 #endif
424 }
425
426 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
428 const __be64 *a2,
429 unsigned int len)
430 {
431 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
432 return false;
433 return true;
434 }
435
436 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
437 const struct in6_addr *addr2,
438 unsigned int prefixlen)
439 {
440 const __be64 *a1 = (const __be64 *)addr1;
441 const __be64 *a2 = (const __be64 *)addr2;
442
443 if (prefixlen >= 64) {
444 if (a1[0] ^ a2[0])
445 return false;
446 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
447 }
448 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
449 }
450 #else
451 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
452 const struct in6_addr *addr2,
453 unsigned int prefixlen)
454 {
455 const __be32 *a1 = addr1->s6_addr32;
456 const __be32 *a2 = addr2->s6_addr32;
457 unsigned int pdw, pbi;
458
459 /* check complete u32 in prefix */
460 pdw = prefixlen >> 5;
461 if (pdw && memcmp(a1, a2, pdw << 2))
462 return false;
463
464 /* check incomplete u32 in prefix */
465 pbi = prefixlen & 0x1f;
466 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
467 return false;
468
469 return true;
470 }
471 #endif
472
473 struct inet_frag_queue;
474
475 enum ip6_defrag_users {
476 IP6_DEFRAG_LOCAL_DELIVER,
477 IP6_DEFRAG_CONNTRACK_IN,
478 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
479 IP6_DEFRAG_CONNTRACK_OUT,
480 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
481 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
482 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
483 };
484
485 struct ip6_create_arg {
486 __be32 id;
487 u32 user;
488 const struct in6_addr *src;
489 const struct in6_addr *dst;
490 u8 ecn;
491 };
492
493 void ip6_frag_init(struct inet_frag_queue *q, void *a);
494 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
495
496 /*
497 * Equivalent of ipv4 struct ip
498 */
499 struct frag_queue {
500 struct inet_frag_queue q;
501
502 __be32 id; /* fragment id */
503 u32 user;
504 struct in6_addr saddr;
505 struct in6_addr daddr;
506
507 int iif;
508 unsigned int csum;
509 __u16 nhoffset;
510 u8 ecn;
511 };
512
513 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
514 struct inet_frags *frags);
515
516 static inline bool ipv6_addr_any(const struct in6_addr *a)
517 {
518 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
519 const unsigned long *ul = (const unsigned long *)a;
520
521 return (ul[0] | ul[1]) == 0UL;
522 #else
523 return (a->s6_addr32[0] | a->s6_addr32[1] |
524 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
525 #endif
526 }
527
528 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
529 {
530 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
531 const unsigned long *ul = (const unsigned long *)a;
532 unsigned long x = ul[0] ^ ul[1];
533
534 return (u32)(x ^ (x >> 32));
535 #else
536 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
537 a->s6_addr32[2] ^ a->s6_addr32[3]);
538 #endif
539 }
540
541 /* more secured version of ipv6_addr_hash() */
542 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
543 {
544 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
545
546 return jhash_3words(v,
547 (__force u32)a->s6_addr32[2],
548 (__force u32)a->s6_addr32[3],
549 initval);
550 }
551
552 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
553 {
554 return __ipv6_addr_jhash(a, ipv6_hash_secret);
555 }
556
557 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
558 {
559 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
560 const unsigned long *ul = (const unsigned long *)a;
561
562 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
563 #else
564 return (a->s6_addr32[0] | a->s6_addr32[1] |
565 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
566 #endif
567 }
568
569 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
570 {
571 return (
572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573 *(__be64 *)a |
574 #else
575 (a->s6_addr32[0] | a->s6_addr32[1]) |
576 #endif
577 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
578 }
579
580 /*
581 * Check for a RFC 4843 ORCHID address
582 * (Overlay Routable Cryptographic Hash Identifiers)
583 */
584 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
585 {
586 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
587 }
588
589 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
590 struct in6_addr *v4mapped)
591 {
592 ipv6_addr_set(v4mapped,
593 0, 0,
594 htonl(0x0000FFFF),
595 addr);
596 }
597
598 /*
599 * find the first different bit between two addresses
600 * length of address must be a multiple of 32bits
601 */
602 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
603 {
604 const __be32 *a1 = token1, *a2 = token2;
605 int i;
606
607 addrlen >>= 2;
608
609 for (i = 0; i < addrlen; i++) {
610 __be32 xb = a1[i] ^ a2[i];
611 if (xb)
612 return i * 32 + 31 - __fls(ntohl(xb));
613 }
614
615 /*
616 * we should *never* get to this point since that
617 * would mean the addrs are equal
618 *
619 * However, we do get to it 8) And exacly, when
620 * addresses are equal 8)
621 *
622 * ip route add 1111::/128 via ...
623 * ip route add 1111::/64 via ...
624 * and we are here.
625 *
626 * Ideally, this function should stop comparison
627 * at prefix length. It does not, but it is still OK,
628 * if returned value is greater than prefix length.
629 * --ANK (980803)
630 */
631 return addrlen << 5;
632 }
633
634 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
635 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
636 {
637 const __be64 *a1 = token1, *a2 = token2;
638 int i;
639
640 addrlen >>= 3;
641
642 for (i = 0; i < addrlen; i++) {
643 __be64 xb = a1[i] ^ a2[i];
644 if (xb)
645 return i * 64 + 63 - __fls(be64_to_cpu(xb));
646 }
647
648 return addrlen << 6;
649 }
650 #endif
651
652 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
653 {
654 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
655 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
656 return __ipv6_addr_diff64(token1, token2, addrlen);
657 #endif
658 return __ipv6_addr_diff32(token1, token2, addrlen);
659 }
660
661 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
662 {
663 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
664 }
665
666 /*
667 * Header manipulation
668 */
669 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
670 __be32 flowlabel)
671 {
672 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
673 }
674
675 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
676 {
677 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
678 }
679
680 /*
681 * Prototypes exported by ipv6
682 */
683
684 /*
685 * rcv function (called from netdevice level)
686 */
687
688 extern int ipv6_rcv(struct sk_buff *skb,
689 struct net_device *dev,
690 struct packet_type *pt,
691 struct net_device *orig_dev);
692
693 extern int ip6_rcv_finish(struct sk_buff *skb);
694
695 /*
696 * upper-layer output functions
697 */
698 extern int ip6_xmit(struct sock *sk,
699 struct sk_buff *skb,
700 struct flowi6 *fl6,
701 struct ipv6_txoptions *opt,
702 int tclass);
703
704 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
705
706 extern int ip6_append_data(struct sock *sk,
707 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
708 void *from,
709 int length,
710 int transhdrlen,
711 int hlimit,
712 int tclass,
713 struct ipv6_txoptions *opt,
714 struct flowi6 *fl6,
715 struct rt6_info *rt,
716 unsigned int flags,
717 int dontfrag);
718
719 extern int ip6_push_pending_frames(struct sock *sk);
720
721 extern void ip6_flush_pending_frames(struct sock *sk);
722
723 extern int ip6_dst_lookup(struct sock *sk,
724 struct dst_entry **dst,
725 struct flowi6 *fl6);
726 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
727 struct flowi6 *fl6,
728 const struct in6_addr *final_dst,
729 bool can_sleep);
730 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
731 struct flowi6 *fl6,
732 const struct in6_addr *final_dst,
733 bool can_sleep);
734 extern struct dst_entry * ip6_blackhole_route(struct net *net,
735 struct dst_entry *orig_dst);
736
737 /*
738 * skb processing functions
739 */
740
741 extern int ip6_output(struct sk_buff *skb);
742 extern int ip6_forward(struct sk_buff *skb);
743 extern int ip6_input(struct sk_buff *skb);
744 extern int ip6_mc_input(struct sk_buff *skb);
745
746 extern int __ip6_local_out(struct sk_buff *skb);
747 extern int ip6_local_out(struct sk_buff *skb);
748
749 /*
750 * Extension header (options) processing
751 */
752
753 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
754 struct ipv6_txoptions *opt,
755 u8 *proto,
756 struct in6_addr **daddr_p);
757 extern void ipv6_push_frag_opts(struct sk_buff *skb,
758 struct ipv6_txoptions *opt,
759 u8 *proto);
760
761 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
762 u8 *nexthdrp, __be16 *frag_offp);
763
764 extern bool ipv6_ext_hdr(u8 nexthdr);
765
766 enum {
767 IP6_FH_F_FRAG = (1 << 0),
768 IP6_FH_F_AUTH = (1 << 1),
769 IP6_FH_F_SKIP_RH = (1 << 2),
770 };
771
772 /* find specified header and get offset to it */
773 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
774 int target, unsigned short *fragoff, int *fragflg);
775
776 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
777
778 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
779 const struct ipv6_txoptions *opt,
780 struct in6_addr *orig);
781
782 /*
783 * socket options (ipv6_sockglue.c)
784 */
785
786 extern int ipv6_setsockopt(struct sock *sk, int level,
787 int optname,
788 char __user *optval,
789 unsigned int optlen);
790 extern int ipv6_getsockopt(struct sock *sk, int level,
791 int optname,
792 char __user *optval,
793 int __user *optlen);
794 extern int compat_ipv6_setsockopt(struct sock *sk,
795 int level,
796 int optname,
797 char __user *optval,
798 unsigned int optlen);
799 extern int compat_ipv6_getsockopt(struct sock *sk,
800 int level,
801 int optname,
802 char __user *optval,
803 int __user *optlen);
804
805 extern int ip6_datagram_connect(struct sock *sk,
806 struct sockaddr *addr, int addr_len);
807
808 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
809 int *addr_len);
810 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
811 int *addr_len);
812 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
813 u32 info, u8 *payload);
814 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
815 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
816
817 extern int inet6_release(struct socket *sock);
818 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
819 int addr_len);
820 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
821 int *uaddr_len, int peer);
822 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
823 unsigned long arg);
824
825 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
826 struct sock *sk);
827
828 /*
829 * reassembly.c
830 */
831 extern const struct proto_ops inet6_stream_ops;
832 extern const struct proto_ops inet6_dgram_ops;
833
834 struct group_source_req;
835 struct group_filter;
836
837 extern int ip6_mc_source(int add, int omode, struct sock *sk,
838 struct group_source_req *pgsr);
839 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
840 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
841 struct group_filter __user *optval,
842 int __user *optlen);
843 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
844 const struct in6_addr *daddr, u32 rnd);
845
846 #ifdef CONFIG_PROC_FS
847 extern int ac6_proc_init(struct net *net);
848 extern void ac6_proc_exit(struct net *net);
849 extern int raw6_proc_init(void);
850 extern void raw6_proc_exit(void);
851 extern int tcp6_proc_init(struct net *net);
852 extern void tcp6_proc_exit(struct net *net);
853 extern int udp6_proc_init(struct net *net);
854 extern void udp6_proc_exit(struct net *net);
855 extern int udplite6_proc_init(void);
856 extern void udplite6_proc_exit(void);
857 extern int ipv6_misc_proc_init(void);
858 extern void ipv6_misc_proc_exit(void);
859 extern int snmp6_register_dev(struct inet6_dev *idev);
860 extern int snmp6_unregister_dev(struct inet6_dev *idev);
861
862 #else
863 static inline int ac6_proc_init(struct net *net) { return 0; }
864 static inline void ac6_proc_exit(struct net *net) { }
865 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
866 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
867 #endif
868
869 #ifdef CONFIG_SYSCTL
870 extern ctl_table ipv6_route_table_template[];
871 extern ctl_table ipv6_icmp_table_template[];
872
873 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
874 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
875 extern int ipv6_sysctl_register(void);
876 extern void ipv6_sysctl_unregister(void);
877 #endif
878
879 #endif /* _NET_IPV6_H */
kernel source for telekom puls (alcatel/mediatek)