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[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 #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 __rcu *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 __rcu *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 bool __ipv6_addr_needs_scope_id(int type)
324 {
325 return type & IPV6_ADDR_LINKLOCAL ||
326 (type & IPV6_ADDR_MULTICAST &&
327 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
328 }
329
330 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
331 {
332 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
333 }
334
335 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
336 {
337 return memcmp(a1, a2, sizeof(struct in6_addr));
338 }
339
340 static inline bool
341 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
342 const struct in6_addr *a2)
343 {
344 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
345 const unsigned long *ul1 = (const unsigned long *)a1;
346 const unsigned long *ulm = (const unsigned long *)m;
347 const unsigned long *ul2 = (const unsigned long *)a2;
348
349 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
350 ((ul1[1] ^ ul2[1]) & ulm[1]));
351 #else
352 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
353 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
354 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
355 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
356 #endif
357 }
358
359 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
360 const struct in6_addr *addr,
361 int plen)
362 {
363 /* caller must guarantee 0 <= plen <= 128 */
364 int o = plen >> 3,
365 b = plen & 0x7;
366
367 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
368 memcpy(pfx->s6_addr, addr, o);
369 if (b != 0)
370 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
371 }
372
373 static inline void __ipv6_addr_set_half(__be32 *addr,
374 __be32 wh, __be32 wl)
375 {
376 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
377 #if defined(__BIG_ENDIAN)
378 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
379 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
380 return;
381 }
382 #elif defined(__LITTLE_ENDIAN)
383 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
384 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
385 return;
386 }
387 #endif
388 #endif
389 addr[0] = wh;
390 addr[1] = wl;
391 }
392
393 static inline void ipv6_addr_set(struct in6_addr *addr,
394 __be32 w1, __be32 w2,
395 __be32 w3, __be32 w4)
396 {
397 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
398 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
399 }
400
401 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
402 const struct in6_addr *a2)
403 {
404 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
405 const unsigned long *ul1 = (const unsigned long *)a1;
406 const unsigned long *ul2 = (const unsigned long *)a2;
407
408 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
409 #else
410 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
411 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
412 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
413 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
414 #endif
415 }
416
417 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
418 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
419 const __be64 *a2,
420 unsigned int len)
421 {
422 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
423 return false;
424 return true;
425 }
426
427 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
428 const struct in6_addr *addr2,
429 unsigned int prefixlen)
430 {
431 const __be64 *a1 = (const __be64 *)addr1;
432 const __be64 *a2 = (const __be64 *)addr2;
433
434 if (prefixlen >= 64) {
435 if (a1[0] ^ a2[0])
436 return false;
437 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
438 }
439 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
440 }
441 #else
442 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
443 const struct in6_addr *addr2,
444 unsigned int prefixlen)
445 {
446 const __be32 *a1 = addr1->s6_addr32;
447 const __be32 *a2 = addr2->s6_addr32;
448 unsigned int pdw, pbi;
449
450 /* check complete u32 in prefix */
451 pdw = prefixlen >> 5;
452 if (pdw && memcmp(a1, a2, pdw << 2))
453 return false;
454
455 /* check incomplete u32 in prefix */
456 pbi = prefixlen & 0x1f;
457 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
458 return false;
459
460 return true;
461 }
462 #endif
463
464 struct inet_frag_queue;
465
466 enum ip6_defrag_users {
467 IP6_DEFRAG_LOCAL_DELIVER,
468 IP6_DEFRAG_CONNTRACK_IN,
469 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
470 IP6_DEFRAG_CONNTRACK_OUT,
471 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
472 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
473 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
474 };
475
476 struct ip6_create_arg {
477 __be32 id;
478 u32 user;
479 const struct in6_addr *src;
480 const struct in6_addr *dst;
481 int iif;
482 u8 ecn;
483 };
484
485 void ip6_frag_init(struct inet_frag_queue *q, void *a);
486 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
487
488 /*
489 * Equivalent of ipv4 struct ip
490 */
491 struct frag_queue {
492 struct inet_frag_queue q;
493
494 __be32 id; /* fragment id */
495 u32 user;
496 struct in6_addr saddr;
497 struct in6_addr daddr;
498
499 int iif;
500 unsigned int csum;
501 __u16 nhoffset;
502 u8 ecn;
503 };
504
505 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
506 struct inet_frags *frags);
507
508 static inline bool ipv6_addr_any(const struct in6_addr *a)
509 {
510 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
511 const unsigned long *ul = (const unsigned long *)a;
512
513 return (ul[0] | ul[1]) == 0UL;
514 #else
515 return (a->s6_addr32[0] | a->s6_addr32[1] |
516 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
517 #endif
518 }
519
520 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
521 {
522 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
523 const unsigned long *ul = (const unsigned long *)a;
524 unsigned long x = ul[0] ^ ul[1];
525
526 return (u32)(x ^ (x >> 32));
527 #else
528 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
529 a->s6_addr32[2] ^ a->s6_addr32[3]);
530 #endif
531 }
532
533 /* more secured version of ipv6_addr_hash() */
534 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
535 {
536 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
537
538 return jhash_3words(v,
539 (__force u32)a->s6_addr32[2],
540 (__force u32)a->s6_addr32[3],
541 initval);
542 }
543
544 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
545 {
546 return __ipv6_addr_jhash(a, ipv6_hash_secret);
547 }
548
549 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
550 {
551 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
552 const unsigned long *ul = (const unsigned long *)a;
553
554 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
555 #else
556 return (a->s6_addr32[0] | a->s6_addr32[1] |
557 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
558 #endif
559 }
560
561 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
562 {
563 return (
564 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
565 *(__be64 *)a |
566 #else
567 (a->s6_addr32[0] | a->s6_addr32[1]) |
568 #endif
569 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
570 }
571
572 /*
573 * Check for a RFC 4843 ORCHID address
574 * (Overlay Routable Cryptographic Hash Identifiers)
575 */
576 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
577 {
578 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
579 }
580
581 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
582 struct in6_addr *v4mapped)
583 {
584 ipv6_addr_set(v4mapped,
585 0, 0,
586 htonl(0x0000FFFF),
587 addr);
588 }
589
590 /*
591 * find the first different bit between two addresses
592 * length of address must be a multiple of 32bits
593 */
594 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
595 {
596 const __be32 *a1 = token1, *a2 = token2;
597 int i;
598
599 addrlen >>= 2;
600
601 for (i = 0; i < addrlen; i++) {
602 __be32 xb = a1[i] ^ a2[i];
603 if (xb)
604 return i * 32 + 31 - __fls(ntohl(xb));
605 }
606
607 /*
608 * we should *never* get to this point since that
609 * would mean the addrs are equal
610 *
611 * However, we do get to it 8) And exacly, when
612 * addresses are equal 8)
613 *
614 * ip route add 1111::/128 via ...
615 * ip route add 1111::/64 via ...
616 * and we are here.
617 *
618 * Ideally, this function should stop comparison
619 * at prefix length. It does not, but it is still OK,
620 * if returned value is greater than prefix length.
621 * --ANK (980803)
622 */
623 return addrlen << 5;
624 }
625
626 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
628 {
629 const __be64 *a1 = token1, *a2 = token2;
630 int i;
631
632 addrlen >>= 3;
633
634 for (i = 0; i < addrlen; i++) {
635 __be64 xb = a1[i] ^ a2[i];
636 if (xb)
637 return i * 64 + 63 - __fls(be64_to_cpu(xb));
638 }
639
640 return addrlen << 6;
641 }
642 #endif
643
644 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
645 {
646 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
647 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
648 return __ipv6_addr_diff64(token1, token2, addrlen);
649 #endif
650 return __ipv6_addr_diff32(token1, token2, addrlen);
651 }
652
653 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
654 {
655 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
656 }
657
658 /*
659 * Header manipulation
660 */
661 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
662 __be32 flowlabel)
663 {
664 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
665 }
666
667 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
668 {
669 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
670 }
671
672 /*
673 * Prototypes exported by ipv6
674 */
675
676 /*
677 * rcv function (called from netdevice level)
678 */
679
680 extern int ipv6_rcv(struct sk_buff *skb,
681 struct net_device *dev,
682 struct packet_type *pt,
683 struct net_device *orig_dev);
684
685 extern int ip6_rcv_finish(struct sk_buff *skb);
686
687 /*
688 * upper-layer output functions
689 */
690 extern int ip6_xmit(struct sock *sk,
691 struct sk_buff *skb,
692 struct flowi6 *fl6,
693 struct ipv6_txoptions *opt,
694 int tclass);
695
696 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
697
698 extern int ip6_append_data(struct sock *sk,
699 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
700 void *from,
701 int length,
702 int transhdrlen,
703 int hlimit,
704 int tclass,
705 struct ipv6_txoptions *opt,
706 struct flowi6 *fl6,
707 struct rt6_info *rt,
708 unsigned int flags,
709 int dontfrag);
710
711 extern int ip6_push_pending_frames(struct sock *sk);
712
713 extern void ip6_flush_pending_frames(struct sock *sk);
714
715 extern int ip6_dst_lookup(struct sock *sk,
716 struct dst_entry **dst,
717 struct flowi6 *fl6);
718 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
719 struct flowi6 *fl6,
720 const struct in6_addr *final_dst,
721 bool can_sleep);
722 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
723 struct flowi6 *fl6,
724 const struct in6_addr *final_dst,
725 bool can_sleep);
726 extern struct dst_entry * ip6_blackhole_route(struct net *net,
727 struct dst_entry *orig_dst);
728
729 /*
730 * skb processing functions
731 */
732
733 extern int ip6_output(struct sk_buff *skb);
734 extern int ip6_forward(struct sk_buff *skb);
735 extern int ip6_input(struct sk_buff *skb);
736 extern int ip6_mc_input(struct sk_buff *skb);
737
738 extern int __ip6_local_out(struct sk_buff *skb);
739 extern int ip6_local_out(struct sk_buff *skb);
740
741 /*
742 * Extension header (options) processing
743 */
744
745 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
746 struct ipv6_txoptions *opt,
747 u8 *proto,
748 struct in6_addr **daddr_p);
749 extern void ipv6_push_frag_opts(struct sk_buff *skb,
750 struct ipv6_txoptions *opt,
751 u8 *proto);
752
753 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
754 u8 *nexthdrp, __be16 *frag_offp);
755
756 extern bool ipv6_ext_hdr(u8 nexthdr);
757
758 enum {
759 IP6_FH_F_FRAG = (1 << 0),
760 IP6_FH_F_AUTH = (1 << 1),
761 IP6_FH_F_SKIP_RH = (1 << 2),
762 };
763
764 /* find specified header and get offset to it */
765 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
766 int target, unsigned short *fragoff, int *fragflg);
767
768 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
769
770 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
771 const struct ipv6_txoptions *opt,
772 struct in6_addr *orig);
773
774 /*
775 * socket options (ipv6_sockglue.c)
776 */
777
778 extern int ipv6_setsockopt(struct sock *sk, int level,
779 int optname,
780 char __user *optval,
781 unsigned int optlen);
782 extern int ipv6_getsockopt(struct sock *sk, int level,
783 int optname,
784 char __user *optval,
785 int __user *optlen);
786 extern int compat_ipv6_setsockopt(struct sock *sk,
787 int level,
788 int optname,
789 char __user *optval,
790 unsigned int optlen);
791 extern int compat_ipv6_getsockopt(struct sock *sk,
792 int level,
793 int optname,
794 char __user *optval,
795 int __user *optlen);
796
797 extern int ip6_datagram_connect(struct sock *sk,
798 struct sockaddr *addr, int addr_len);
799
800 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
801 int *addr_len);
802 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
803 int *addr_len);
804 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
805 u32 info, u8 *payload);
806 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
807 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
808
809 extern int inet6_release(struct socket *sock);
810 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
811 int addr_len);
812 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
813 int *uaddr_len, int peer);
814 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
815 unsigned long arg);
816
817 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
818 struct sock *sk);
819
820 /*
821 * reassembly.c
822 */
823 extern const struct proto_ops inet6_stream_ops;
824 extern const struct proto_ops inet6_dgram_ops;
825
826 struct group_source_req;
827 struct group_filter;
828
829 extern int ip6_mc_source(int add, int omode, struct sock *sk,
830 struct group_source_req *pgsr);
831 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
832 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
833 struct group_filter __user *optval,
834 int __user *optlen);
835 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
836 const struct in6_addr *daddr, u32 rnd);
837
838 #ifdef CONFIG_PROC_FS
839 extern int ac6_proc_init(struct net *net);
840 extern void ac6_proc_exit(struct net *net);
841 extern int raw6_proc_init(void);
842 extern void raw6_proc_exit(void);
843 extern int tcp6_proc_init(struct net *net);
844 extern void tcp6_proc_exit(struct net *net);
845 extern int udp6_proc_init(struct net *net);
846 extern void udp6_proc_exit(struct net *net);
847 extern int udplite6_proc_init(void);
848 extern void udplite6_proc_exit(void);
849 extern int ipv6_misc_proc_init(void);
850 extern void ipv6_misc_proc_exit(void);
851 extern int snmp6_register_dev(struct inet6_dev *idev);
852 extern int snmp6_unregister_dev(struct inet6_dev *idev);
853
854 #else
855 static inline int ac6_proc_init(struct net *net) { return 0; }
856 static inline void ac6_proc_exit(struct net *net) { }
857 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
858 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
859 #endif
860
861 #ifdef CONFIG_SYSCTL
862 extern ctl_table ipv6_route_table_template[];
863 extern ctl_table ipv6_icmp_table_template[];
864
865 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
866 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
867 extern int ipv6_sysctl_register(void);
868 extern void ipv6_sysctl_unregister(void);
869 #endif
870
871 #endif /* _NET_IPV6_H */
kernel source for telekom puls (alcatel/mediatek)