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hpsa: fix bad -ENOMEM return value in hpsa_big_passthru_ioctl
[linux/fpc-iii.git] / include / net / ipv6.h
blob6b4956e4408f7ec634d010b31a4a0077d074c8e7
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 /* Length of this structure */
205 int tot_len;
206
207 /* length of extension headers */
208
209 __u16 opt_flen; /* after fragment hdr */
210 __u16 opt_nflen; /* before fragment hdr */
211
212 struct ipv6_opt_hdr *hopopt;
213 struct ipv6_opt_hdr *dst0opt;
214 struct ipv6_rt_hdr *srcrt; /* Routing Header */
215 struct ipv6_opt_hdr *dst1opt;
216
217 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
218 };
219
220 struct ip6_flowlabel {
221 struct ip6_flowlabel __rcu *next;
222 __be32 label;
223 atomic_t users;
224 struct in6_addr dst;
225 struct ipv6_txoptions *opt;
226 unsigned long linger;
227 struct rcu_head rcu;
228 u8 share;
229 union {
230 struct pid *pid;
231 kuid_t uid;
232 } owner;
233 unsigned long lastuse;
234 unsigned long expires;
235 struct net *fl_net;
236 };
237
238 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
239 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
240
241 struct ipv6_fl_socklist {
242 struct ipv6_fl_socklist __rcu *next;
243 struct ip6_flowlabel *fl;
244 struct rcu_head rcu;
245 };
246
247 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
248 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
249 struct ip6_flowlabel * fl,
250 struct ipv6_txoptions * fopt);
251 extern void fl6_free_socklist(struct sock *sk);
252 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
253 extern int ip6_flowlabel_init(void);
254 extern void ip6_flowlabel_cleanup(void);
255
256 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
257 {
258 if (fl)
259 atomic_dec(&fl->users);
260 }
261
262 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
263
264 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
265 struct icmp6hdr *thdr, int len);
266
267 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
268 struct sock *sk, struct flowi6 *fl6);
269
270 extern int ip6_ra_control(struct sock *sk, int sel);
271
272 extern int ipv6_parse_hopopts(struct sk_buff *skb);
273
274 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
275 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
276 int newtype,
277 struct ipv6_opt_hdr __user *newopt,
278 int newoptlen);
279 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
280 struct ipv6_txoptions *opt);
281
282 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
283
284 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
285 {
286 /* If forwarding is enabled, RA are not accepted unless the special
287 * hybrid mode (accept_ra=2) is enabled.
288 */
289 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
290 idev->cnf.accept_ra;
291 }
292
293 #if IS_ENABLED(CONFIG_IPV6)
294 static inline int ip6_frag_nqueues(struct net *net)
295 {
296 return net->ipv6.frags.nqueues;
297 }
298
299 static inline int ip6_frag_mem(struct net *net)
300 {
301 return sum_frag_mem_limit(&net->ipv6.frags);
302 }
303 #endif
304
305 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
306 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
307 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
308
309 extern int __ipv6_addr_type(const struct in6_addr *addr);
310 static inline int ipv6_addr_type(const struct in6_addr *addr)
311 {
312 return __ipv6_addr_type(addr) & 0xffff;
313 }
314
315 static inline int ipv6_addr_scope(const struct in6_addr *addr)
316 {
317 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
318 }
319
320 static inline int __ipv6_addr_src_scope(int type)
321 {
322 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
323 }
324
325 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
326 {
327 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
328 }
329
330 static inline bool __ipv6_addr_needs_scope_id(int type)
331 {
332 return type & IPV6_ADDR_LINKLOCAL ||
333 (type & IPV6_ADDR_MULTICAST &&
334 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
335 }
336
337 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
338 {
339 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
340 }
341
342 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
343 {
344 return memcmp(a1, a2, sizeof(struct in6_addr));
345 }
346
347 static inline bool
348 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
349 const struct in6_addr *a2)
350 {
351 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
352 const unsigned long *ul1 = (const unsigned long *)a1;
353 const unsigned long *ulm = (const unsigned long *)m;
354 const unsigned long *ul2 = (const unsigned long *)a2;
355
356 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
357 ((ul1[1] ^ ul2[1]) & ulm[1]));
358 #else
359 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
360 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
361 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
362 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
363 #endif
364 }
365
366 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
367 const struct in6_addr *addr,
368 int plen)
369 {
370 /* caller must guarantee 0 <= plen <= 128 */
371 int o = plen >> 3,
372 b = plen & 0x7;
373
374 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
375 memcpy(pfx->s6_addr, addr, o);
376 if (b != 0)
377 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
378 }
379
380 static inline void __ipv6_addr_set_half(__be32 *addr,
381 __be32 wh, __be32 wl)
382 {
383 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
384 #if defined(__BIG_ENDIAN)
385 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
386 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
387 return;
388 }
389 #elif defined(__LITTLE_ENDIAN)
390 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
391 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
392 return;
393 }
394 #endif
395 #endif
396 addr[0] = wh;
397 addr[1] = wl;
398 }
399
400 static inline void ipv6_addr_set(struct in6_addr *addr,
401 __be32 w1, __be32 w2,
402 __be32 w3, __be32 w4)
403 {
404 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
405 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
406 }
407
408 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
409 const struct in6_addr *a2)
410 {
411 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
412 const unsigned long *ul1 = (const unsigned long *)a1;
413 const unsigned long *ul2 = (const unsigned long *)a2;
414
415 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
416 #else
417 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
418 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
419 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
420 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
421 #endif
422 }
423
424 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
425 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
426 const __be64 *a2,
427 unsigned int len)
428 {
429 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
430 return false;
431 return true;
432 }
433
434 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
435 const struct in6_addr *addr2,
436 unsigned int prefixlen)
437 {
438 const __be64 *a1 = (const __be64 *)addr1;
439 const __be64 *a2 = (const __be64 *)addr2;
440
441 if (prefixlen >= 64) {
442 if (a1[0] ^ a2[0])
443 return false;
444 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
445 }
446 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
447 }
448 #else
449 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
450 const struct in6_addr *addr2,
451 unsigned int prefixlen)
452 {
453 const __be32 *a1 = addr1->s6_addr32;
454 const __be32 *a2 = addr2->s6_addr32;
455 unsigned int pdw, pbi;
456
457 /* check complete u32 in prefix */
458 pdw = prefixlen >> 5;
459 if (pdw && memcmp(a1, a2, pdw << 2))
460 return false;
461
462 /* check incomplete u32 in prefix */
463 pbi = prefixlen & 0x1f;
464 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
465 return false;
466
467 return true;
468 }
469 #endif
470
471 struct inet_frag_queue;
472
473 enum ip6_defrag_users {
474 IP6_DEFRAG_LOCAL_DELIVER,
475 IP6_DEFRAG_CONNTRACK_IN,
476 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
477 IP6_DEFRAG_CONNTRACK_OUT,
478 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
479 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
480 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
481 };
482
483 struct ip6_create_arg {
484 __be32 id;
485 u32 user;
486 const struct in6_addr *src;
487 const struct in6_addr *dst;
488 u8 ecn;
489 };
490
491 void ip6_frag_init(struct inet_frag_queue *q, void *a);
492 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
493
494 /*
495 * Equivalent of ipv4 struct ip
496 */
497 struct frag_queue {
498 struct inet_frag_queue q;
499
500 __be32 id; /* fragment id */
501 u32 user;
502 struct in6_addr saddr;
503 struct in6_addr daddr;
504
505 int iif;
506 unsigned int csum;
507 __u16 nhoffset;
508 u8 ecn;
509 };
510
511 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
512 struct inet_frags *frags);
513
514 static inline bool ipv6_addr_any(const struct in6_addr *a)
515 {
516 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
517 const unsigned long *ul = (const unsigned long *)a;
518
519 return (ul[0] | ul[1]) == 0UL;
520 #else
521 return (a->s6_addr32[0] | a->s6_addr32[1] |
522 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
523 #endif
524 }
525
526 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
527 {
528 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
529 const unsigned long *ul = (const unsigned long *)a;
530 unsigned long x = ul[0] ^ ul[1];
531
532 return (u32)(x ^ (x >> 32));
533 #else
534 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
535 a->s6_addr32[2] ^ a->s6_addr32[3]);
536 #endif
537 }
538
539 /* more secured version of ipv6_addr_hash() */
540 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
541 {
542 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
543
544 return jhash_3words(v,
545 (__force u32)a->s6_addr32[2],
546 (__force u32)a->s6_addr32[3],
547 initval);
548 }
549
550 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
551 {
552 return __ipv6_addr_jhash(a, ipv6_hash_secret);
553 }
554
555 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
556 {
557 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
558 const unsigned long *ul = (const unsigned long *)a;
559
560 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
561 #else
562 return (a->s6_addr32[0] | a->s6_addr32[1] |
563 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
564 #endif
565 }
566
567 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
568 {
569 return (
570 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
571 *(__be64 *)a |
572 #else
573 (a->s6_addr32[0] | a->s6_addr32[1]) |
574 #endif
575 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
576 }
577
578 /*
579 * Check for a RFC 4843 ORCHID address
580 * (Overlay Routable Cryptographic Hash Identifiers)
581 */
582 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
583 {
584 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
585 }
586
587 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
588 struct in6_addr *v4mapped)
589 {
590 ipv6_addr_set(v4mapped,
591 0, 0,
592 htonl(0x0000FFFF),
593 addr);
594 }
595
596 /*
597 * find the first different bit between two addresses
598 * length of address must be a multiple of 32bits
599 */
600 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
601 {
602 const __be32 *a1 = token1, *a2 = token2;
603 int i;
604
605 addrlen >>= 2;
606
607 for (i = 0; i < addrlen; i++) {
608 __be32 xb = a1[i] ^ a2[i];
609 if (xb)
610 return i * 32 + 31 - __fls(ntohl(xb));
611 }
612
613 /*
614 * we should *never* get to this point since that
615 * would mean the addrs are equal
616 *
617 * However, we do get to it 8) And exacly, when
618 * addresses are equal 8)
619 *
620 * ip route add 1111::/128 via ...
621 * ip route add 1111::/64 via ...
622 * and we are here.
623 *
624 * Ideally, this function should stop comparison
625 * at prefix length. It does not, but it is still OK,
626 * if returned value is greater than prefix length.
627 * --ANK (980803)
628 */
629 return addrlen << 5;
630 }
631
632 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
633 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
634 {
635 const __be64 *a1 = token1, *a2 = token2;
636 int i;
637
638 addrlen >>= 3;
639
640 for (i = 0; i < addrlen; i++) {
641 __be64 xb = a1[i] ^ a2[i];
642 if (xb)
643 return i * 64 + 63 - __fls(be64_to_cpu(xb));
644 }
645
646 return addrlen << 6;
647 }
648 #endif
649
650 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
651 {
652 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
653 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
654 return __ipv6_addr_diff64(token1, token2, addrlen);
655 #endif
656 return __ipv6_addr_diff32(token1, token2, addrlen);
657 }
658
659 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
660 {
661 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
662 }
663
664 extern int ip6_dst_hoplimit(struct dst_entry *dst);
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 struct ctl_table ipv6_route_table_template[];
871 extern struct 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 */
Linux with added FPC-III support