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ipv6: split inet6_ehashfn to hash functions per compilation unit
[deliverable/linux.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_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 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
248 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
249 struct ip6_flowlabel *fl,
250 struct ipv6_txoptions *fopt);
251 void fl6_free_socklist(struct sock *sk);
252 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
253 int ip6_flowlabel_init(void);
254 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 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 int ip6_ra_control(struct sock *sk, int sel);
271
272 int ipv6_parse_hopopts(struct sk_buff *skb);
273
274 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
275 struct ipv6_txoptions *opt);
276 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
277 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 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 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 bool ipv6_addr_loopback(const struct in6_addr *a)
553 {
554 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
555 const unsigned long *ul = (const unsigned long *)a;
556
557 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
558 #else
559 return (a->s6_addr32[0] | a->s6_addr32[1] |
560 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
561 #endif
562 }
563
564 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
565 {
566 return (
567 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
568 *(__be64 *)a |
569 #else
570 (a->s6_addr32[0] | a->s6_addr32[1]) |
571 #endif
572 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
573 }
574
575 /*
576 * Check for a RFC 4843 ORCHID address
577 * (Overlay Routable Cryptographic Hash Identifiers)
578 */
579 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
580 {
581 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
582 }
583
584 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
585 struct in6_addr *v4mapped)
586 {
587 ipv6_addr_set(v4mapped,
588 0, 0,
589 htonl(0x0000FFFF),
590 addr);
591 }
592
593 /*
594 * find the first different bit between two addresses
595 * length of address must be a multiple of 32bits
596 */
597 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
598 {
599 const __be32 *a1 = token1, *a2 = token2;
600 int i;
601
602 addrlen >>= 2;
603
604 for (i = 0; i < addrlen; i++) {
605 __be32 xb = a1[i] ^ a2[i];
606 if (xb)
607 return i * 32 + 31 - __fls(ntohl(xb));
608 }
609
610 /*
611 * we should *never* get to this point since that
612 * would mean the addrs are equal
613 *
614 * However, we do get to it 8) And exacly, when
615 * addresses are equal 8)
616 *
617 * ip route add 1111::/128 via ...
618 * ip route add 1111::/64 via ...
619 * and we are here.
620 *
621 * Ideally, this function should stop comparison
622 * at prefix length. It does not, but it is still OK,
623 * if returned value is greater than prefix length.
624 * --ANK (980803)
625 */
626 return addrlen << 5;
627 }
628
629 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
630 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
631 {
632 const __be64 *a1 = token1, *a2 = token2;
633 int i;
634
635 addrlen >>= 3;
636
637 for (i = 0; i < addrlen; i++) {
638 __be64 xb = a1[i] ^ a2[i];
639 if (xb)
640 return i * 64 + 63 - __fls(be64_to_cpu(xb));
641 }
642
643 return addrlen << 6;
644 }
645 #endif
646
647 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
648 {
649 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
650 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
651 return __ipv6_addr_diff64(token1, token2, addrlen);
652 #endif
653 return __ipv6_addr_diff32(token1, token2, addrlen);
654 }
655
656 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
657 {
658 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
659 }
660
661 void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
662
663 int ip6_dst_hoplimit(struct dst_entry *dst);
664
665 /*
666 * Header manipulation
667 */
668 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
669 __be32 flowlabel)
670 {
671 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
672 }
673
674 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
675 {
676 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
677 }
678
679 /*
680 * Prototypes exported by ipv6
681 */
682
683 /*
684 * rcv function (called from netdevice level)
685 */
686
687 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
688 struct packet_type *pt, struct net_device *orig_dev);
689
690 int ip6_rcv_finish(struct sk_buff *skb);
691
692 /*
693 * upper-layer output functions
694 */
695 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
696 struct ipv6_txoptions *opt, int tclass);
697
698 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
699
700 int ip6_append_data(struct sock *sk,
701 int getfrag(void *from, char *to, int offset, int len,
702 int odd, struct sk_buff *skb),
703 void *from, int length, int transhdrlen, int hlimit,
704 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
705 struct rt6_info *rt, unsigned int flags, int dontfrag);
706
707 int ip6_push_pending_frames(struct sock *sk);
708
709 void ip6_flush_pending_frames(struct sock *sk);
710
711 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
712 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
713 const struct in6_addr *final_dst,
714 bool can_sleep);
715 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
716 const struct in6_addr *final_dst,
717 bool can_sleep);
718 struct dst_entry *ip6_blackhole_route(struct net *net,
719 struct dst_entry *orig_dst);
720
721 /*
722 * skb processing functions
723 */
724
725 int ip6_output(struct sk_buff *skb);
726 int ip6_forward(struct sk_buff *skb);
727 int ip6_input(struct sk_buff *skb);
728 int ip6_mc_input(struct sk_buff *skb);
729
730 int __ip6_local_out(struct sk_buff *skb);
731 int ip6_local_out(struct sk_buff *skb);
732
733 /*
734 * Extension header (options) processing
735 */
736
737 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
738 u8 *proto, struct in6_addr **daddr_p);
739 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
740 u8 *proto);
741
742 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
743 __be16 *frag_offp);
744
745 bool ipv6_ext_hdr(u8 nexthdr);
746
747 enum {
748 IP6_FH_F_FRAG = (1 << 0),
749 IP6_FH_F_AUTH = (1 << 1),
750 IP6_FH_F_SKIP_RH = (1 << 2),
751 };
752
753 /* find specified header and get offset to it */
754 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
755 unsigned short *fragoff, int *fragflg);
756
757 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
758
759 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
760 const struct ipv6_txoptions *opt,
761 struct in6_addr *orig);
762
763 /*
764 * socket options (ipv6_sockglue.c)
765 */
766
767 int ipv6_setsockopt(struct sock *sk, int level, int optname,
768 char __user *optval, unsigned int optlen);
769 int ipv6_getsockopt(struct sock *sk, int level, int optname,
770 char __user *optval, int __user *optlen);
771 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
772 char __user *optval, unsigned int optlen);
773 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
774 char __user *optval, int __user *optlen);
775
776 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
777
778 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
779 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
780 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
781 u32 info, u8 *payload);
782 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
783 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
784
785 int inet6_release(struct socket *sock);
786 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
787 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
788 int peer);
789 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
790
791 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
792 struct sock *sk);
793
794 /*
795 * reassembly.c
796 */
797 extern const struct proto_ops inet6_stream_ops;
798 extern const struct proto_ops inet6_dgram_ops;
799
800 struct group_source_req;
801 struct group_filter;
802
803 int ip6_mc_source(int add, int omode, struct sock *sk,
804 struct group_source_req *pgsr);
805 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
806 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
807 struct group_filter __user *optval, int __user *optlen);
808 unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
809 const struct in6_addr *daddr, u32 rnd);
810
811 #ifdef CONFIG_PROC_FS
812 int ac6_proc_init(struct net *net);
813 void ac6_proc_exit(struct net *net);
814 int raw6_proc_init(void);
815 void raw6_proc_exit(void);
816 int tcp6_proc_init(struct net *net);
817 void tcp6_proc_exit(struct net *net);
818 int udp6_proc_init(struct net *net);
819 void udp6_proc_exit(struct net *net);
820 int udplite6_proc_init(void);
821 void udplite6_proc_exit(void);
822 int ipv6_misc_proc_init(void);
823 void ipv6_misc_proc_exit(void);
824 int snmp6_register_dev(struct inet6_dev *idev);
825 int snmp6_unregister_dev(struct inet6_dev *idev);
826
827 #else
828 static inline int ac6_proc_init(struct net *net) { return 0; }
829 static inline void ac6_proc_exit(struct net *net) { }
830 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
831 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
832 #endif
833
834 #ifdef CONFIG_SYSCTL
835 extern struct ctl_table ipv6_route_table_template[];
836 extern struct ctl_table ipv6_icmp_table_template[];
837
838 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
839 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
840 int ipv6_sysctl_register(void);
841 void ipv6_sysctl_unregister(void);
842 #endif
843
844 #endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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