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Merge branch 'fix/firewire' into for-linus
[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 ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq);
254 int ip6_flowlabel_init(void);
255 void ip6_flowlabel_cleanup(void);
256
257 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
258 {
259 if (fl)
260 atomic_dec(&fl->users);
261 }
262
263 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
264
265 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
266 struct icmp6hdr *thdr, int len);
267
268 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
269 struct sock *sk, struct flowi6 *fl6);
270
271 int ip6_ra_control(struct sock *sk, int sel);
272
273 int ipv6_parse_hopopts(struct sk_buff *skb);
274
275 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
276 struct ipv6_txoptions *opt);
277 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
278 struct ipv6_txoptions *opt,
279 int newtype,
280 struct ipv6_opt_hdr __user *newopt,
281 int newoptlen);
282 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
283 struct ipv6_txoptions *opt);
284
285 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
286
287 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
288 {
289 /* If forwarding is enabled, RA are not accepted unless the special
290 * hybrid mode (accept_ra=2) is enabled.
291 */
292 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
293 idev->cnf.accept_ra;
294 }
295
296 #if IS_ENABLED(CONFIG_IPV6)
297 static inline int ip6_frag_nqueues(struct net *net)
298 {
299 return net->ipv6.frags.nqueues;
300 }
301
302 static inline int ip6_frag_mem(struct net *net)
303 {
304 return sum_frag_mem_limit(&net->ipv6.frags);
305 }
306 #endif
307
308 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
309 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
310 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
311
312 int __ipv6_addr_type(const struct in6_addr *addr);
313 static inline int ipv6_addr_type(const struct in6_addr *addr)
314 {
315 return __ipv6_addr_type(addr) & 0xffff;
316 }
317
318 static inline int ipv6_addr_scope(const struct in6_addr *addr)
319 {
320 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
321 }
322
323 static inline int __ipv6_addr_src_scope(int type)
324 {
325 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
326 }
327
328 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
329 {
330 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
331 }
332
333 static inline bool __ipv6_addr_needs_scope_id(int type)
334 {
335 return type & IPV6_ADDR_LINKLOCAL ||
336 (type & IPV6_ADDR_MULTICAST &&
337 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
338 }
339
340 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
341 {
342 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
343 }
344
345 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
346 {
347 return memcmp(a1, a2, sizeof(struct in6_addr));
348 }
349
350 static inline bool
351 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
352 const struct in6_addr *a2)
353 {
354 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
355 const unsigned long *ul1 = (const unsigned long *)a1;
356 const unsigned long *ulm = (const unsigned long *)m;
357 const unsigned long *ul2 = (const unsigned long *)a2;
358
359 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
360 ((ul1[1] ^ ul2[1]) & ulm[1]));
361 #else
362 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
363 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
364 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
365 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
366 #endif
367 }
368
369 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
370 const struct in6_addr *addr,
371 int plen)
372 {
373 /* caller must guarantee 0 <= plen <= 128 */
374 int o = plen >> 3,
375 b = plen & 0x7;
376
377 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
378 memcpy(pfx->s6_addr, addr, o);
379 if (b != 0)
380 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
381 }
382
383 static inline void __ipv6_addr_set_half(__be32 *addr,
384 __be32 wh, __be32 wl)
385 {
386 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
387 #if defined(__BIG_ENDIAN)
388 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
389 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
390 return;
391 }
392 #elif defined(__LITTLE_ENDIAN)
393 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
394 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
395 return;
396 }
397 #endif
398 #endif
399 addr[0] = wh;
400 addr[1] = wl;
401 }
402
403 static inline void ipv6_addr_set(struct in6_addr *addr,
404 __be32 w1, __be32 w2,
405 __be32 w3, __be32 w4)
406 {
407 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
408 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
409 }
410
411 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
412 const struct in6_addr *a2)
413 {
414 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
415 const unsigned long *ul1 = (const unsigned long *)a1;
416 const unsigned long *ul2 = (const unsigned long *)a2;
417
418 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
419 #else
420 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
421 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
422 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
423 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
424 #endif
425 }
426
427 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
428 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
429 const __be64 *a2,
430 unsigned int len)
431 {
432 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
433 return false;
434 return true;
435 }
436
437 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
438 const struct in6_addr *addr2,
439 unsigned int prefixlen)
440 {
441 const __be64 *a1 = (const __be64 *)addr1;
442 const __be64 *a2 = (const __be64 *)addr2;
443
444 if (prefixlen >= 64) {
445 if (a1[0] ^ a2[0])
446 return false;
447 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
448 }
449 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
450 }
451 #else
452 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
453 const struct in6_addr *addr2,
454 unsigned int prefixlen)
455 {
456 const __be32 *a1 = addr1->s6_addr32;
457 const __be32 *a2 = addr2->s6_addr32;
458 unsigned int pdw, pbi;
459
460 /* check complete u32 in prefix */
461 pdw = prefixlen >> 5;
462 if (pdw && memcmp(a1, a2, pdw << 2))
463 return false;
464
465 /* check incomplete u32 in prefix */
466 pbi = prefixlen & 0x1f;
467 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
468 return false;
469
470 return true;
471 }
472 #endif
473
474 struct inet_frag_queue;
475
476 enum ip6_defrag_users {
477 IP6_DEFRAG_LOCAL_DELIVER,
478 IP6_DEFRAG_CONNTRACK_IN,
479 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
480 IP6_DEFRAG_CONNTRACK_OUT,
481 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
482 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
483 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
484 };
485
486 struct ip6_create_arg {
487 __be32 id;
488 u32 user;
489 const struct in6_addr *src;
490 const struct in6_addr *dst;
491 u8 ecn;
492 };
493
494 void ip6_frag_init(struct inet_frag_queue *q, void *a);
495 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
496
497 /*
498 * Equivalent of ipv4 struct ip
499 */
500 struct frag_queue {
501 struct inet_frag_queue q;
502
503 __be32 id; /* fragment id */
504 u32 user;
505 struct in6_addr saddr;
506 struct in6_addr daddr;
507
508 int iif;
509 unsigned int csum;
510 __u16 nhoffset;
511 u8 ecn;
512 };
513
514 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
515 struct inet_frags *frags);
516
517 static inline bool ipv6_addr_any(const struct in6_addr *a)
518 {
519 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
520 const unsigned long *ul = (const unsigned long *)a;
521
522 return (ul[0] | ul[1]) == 0UL;
523 #else
524 return (a->s6_addr32[0] | a->s6_addr32[1] |
525 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
526 #endif
527 }
528
529 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
530 {
531 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
532 const unsigned long *ul = (const unsigned long *)a;
533 unsigned long x = ul[0] ^ ul[1];
534
535 return (u32)(x ^ (x >> 32));
536 #else
537 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
538 a->s6_addr32[2] ^ a->s6_addr32[3]);
539 #endif
540 }
541
542 /* more secured version of ipv6_addr_hash() */
543 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
544 {
545 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
546
547 return jhash_3words(v,
548 (__force u32)a->s6_addr32[2],
549 (__force u32)a->s6_addr32[3],
550 initval);
551 }
552
553 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
554 {
555 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
556 const unsigned long *ul = (const unsigned long *)a;
557
558 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
559 #else
560 return (a->s6_addr32[0] | a->s6_addr32[1] |
561 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
562 #endif
563 }
564
565 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
566 {
567 return (
568 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
569 *(__be64 *)a |
570 #else
571 (a->s6_addr32[0] | a->s6_addr32[1]) |
572 #endif
573 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
574 }
575
576 /*
577 * Check for a RFC 4843 ORCHID address
578 * (Overlay Routable Cryptographic Hash Identifiers)
579 */
580 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
581 {
582 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
583 }
584
585 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
586 struct in6_addr *v4mapped)
587 {
588 ipv6_addr_set(v4mapped,
589 0, 0,
590 htonl(0x0000FFFF),
591 addr);
592 }
593
594 /*
595 * find the first different bit between two addresses
596 * length of address must be a multiple of 32bits
597 */
598 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
599 {
600 const __be32 *a1 = token1, *a2 = token2;
601 int i;
602
603 addrlen >>= 2;
604
605 for (i = 0; i < addrlen; i++) {
606 __be32 xb = a1[i] ^ a2[i];
607 if (xb)
608 return i * 32 + 31 - __fls(ntohl(xb));
609 }
610
611 /*
612 * we should *never* get to this point since that
613 * would mean the addrs are equal
614 *
615 * However, we do get to it 8) And exacly, when
616 * addresses are equal 8)
617 *
618 * ip route add 1111::/128 via ...
619 * ip route add 1111::/64 via ...
620 * and we are here.
621 *
622 * Ideally, this function should stop comparison
623 * at prefix length. It does not, but it is still OK,
624 * if returned value is greater than prefix length.
625 * --ANK (980803)
626 */
627 return addrlen << 5;
628 }
629
630 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
631 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
632 {
633 const __be64 *a1 = token1, *a2 = token2;
634 int i;
635
636 addrlen >>= 3;
637
638 for (i = 0; i < addrlen; i++) {
639 __be64 xb = a1[i] ^ a2[i];
640 if (xb)
641 return i * 64 + 63 - __fls(be64_to_cpu(xb));
642 }
643
644 return addrlen << 6;
645 }
646 #endif
647
648 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
649 {
650 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
651 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
652 return __ipv6_addr_diff64(token1, token2, addrlen);
653 #endif
654 return __ipv6_addr_diff32(token1, token2, addrlen);
655 }
656
657 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
658 {
659 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
660 }
661
662 void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
663
664 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 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
689 struct packet_type *pt, struct net_device *orig_dev);
690
691 int ip6_rcv_finish(struct sk_buff *skb);
692
693 /*
694 * upper-layer output functions
695 */
696 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
697 struct ipv6_txoptions *opt, int tclass);
698
699 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
700
701 int ip6_append_data(struct sock *sk,
702 int getfrag(void *from, char *to, int offset, int len,
703 int odd, struct sk_buff *skb),
704 void *from, int length, int transhdrlen, int hlimit,
705 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
706 struct rt6_info *rt, unsigned int flags, int dontfrag);
707
708 int ip6_push_pending_frames(struct sock *sk);
709
710 void ip6_flush_pending_frames(struct sock *sk);
711
712 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
713 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
714 const struct in6_addr *final_dst,
715 bool can_sleep);
716 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
717 const struct in6_addr *final_dst,
718 bool can_sleep);
719 struct dst_entry *ip6_blackhole_route(struct net *net,
720 struct dst_entry *orig_dst);
721
722 /*
723 * skb processing functions
724 */
725
726 int ip6_output(struct sk_buff *skb);
727 int ip6_forward(struct sk_buff *skb);
728 int ip6_input(struct sk_buff *skb);
729 int ip6_mc_input(struct sk_buff *skb);
730
731 int __ip6_local_out(struct sk_buff *skb);
732 int ip6_local_out(struct sk_buff *skb);
733
734 /*
735 * Extension header (options) processing
736 */
737
738 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
739 u8 *proto, struct in6_addr **daddr_p);
740 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
741 u8 *proto);
742
743 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
744 __be16 *frag_offp);
745
746 bool ipv6_ext_hdr(u8 nexthdr);
747
748 enum {
749 IP6_FH_F_FRAG = (1 << 0),
750 IP6_FH_F_AUTH = (1 << 1),
751 IP6_FH_F_SKIP_RH = (1 << 2),
752 };
753
754 /* find specified header and get offset to it */
755 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
756 unsigned short *fragoff, int *fragflg);
757
758 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
759
760 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
761 const struct ipv6_txoptions *opt,
762 struct in6_addr *orig);
763
764 /*
765 * socket options (ipv6_sockglue.c)
766 */
767
768 int ipv6_setsockopt(struct sock *sk, int level, int optname,
769 char __user *optval, unsigned int optlen);
770 int ipv6_getsockopt(struct sock *sk, int level, int optname,
771 char __user *optval, int __user *optlen);
772 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
773 char __user *optval, unsigned int optlen);
774 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
775 char __user *optval, int __user *optlen);
776
777 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
778
779 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
780 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
781 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
782 u32 info, u8 *payload);
783 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
784 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
785
786 int inet6_release(struct socket *sock);
787 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
788 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
789 int peer);
790 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
791
792 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
793 struct sock *sk);
794
795 /*
796 * reassembly.c
797 */
798 extern const struct proto_ops inet6_stream_ops;
799 extern const struct proto_ops inet6_dgram_ops;
800
801 struct group_source_req;
802 struct group_filter;
803
804 int ip6_mc_source(int add, int omode, struct sock *sk,
805 struct group_source_req *pgsr);
806 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
807 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
808 struct group_filter __user *optval, int __user *optlen);
809
810 #ifdef CONFIG_PROC_FS
811 int ac6_proc_init(struct net *net);
812 void ac6_proc_exit(struct net *net);
813 int raw6_proc_init(void);
814 void raw6_proc_exit(void);
815 int tcp6_proc_init(struct net *net);
816 void tcp6_proc_exit(struct net *net);
817 int udp6_proc_init(struct net *net);
818 void udp6_proc_exit(struct net *net);
819 int udplite6_proc_init(void);
820 void udplite6_proc_exit(void);
821 int ipv6_misc_proc_init(void);
822 void ipv6_misc_proc_exit(void);
823 int snmp6_register_dev(struct inet6_dev *idev);
824 int snmp6_unregister_dev(struct inet6_dev *idev);
825
826 #else
827 static inline int ac6_proc_init(struct net *net) { return 0; }
828 static inline void ac6_proc_exit(struct net *net) { }
829 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
830 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
831 #endif
832
833 #ifdef CONFIG_SYSCTL
834 extern struct ctl_table ipv6_route_table_template[];
835 extern struct ctl_table ipv6_icmp_table_template[];
836
837 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
838 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
839 int ipv6_sysctl_register(void);
840 void ipv6_sysctl_unregister(void);
841 #endif
842
843 #endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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