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ipv6: Remove __ipv6_prefix_equal().
[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 <net/if_inet6.h>
19 #include <net/ndisc.h>
20 #include <net/flow.h>
21 #include <net/snmp.h>
22
23 #define SIN6_LEN_RFC2133 24
24
25 #define IPV6_MAXPLEN 65535
26
27 /*
28 * NextHeader field of IPv6 header
29 */
30
31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
32 #define NEXTHDR_TCP 6 /* TCP segment. */
33 #define NEXTHDR_UDP 17 /* UDP message. */
34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
35 #define NEXTHDR_ROUTING 43 /* Routing header. */
36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
37 #define NEXTHDR_GRE 47 /* GRE header. */
38 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
39 #define NEXTHDR_AUTH 51 /* Authentication header. */
40 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
41 #define NEXTHDR_NONE 59 /* No next header */
42 #define NEXTHDR_DEST 60 /* Destination options header. */
43 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
44
45 #define NEXTHDR_MAX 255
46
47
48
49 #define IPV6_DEFAULT_HOPLIMIT 64
50 #define IPV6_DEFAULT_MCASTHOPS 1
51
52 /*
53 * Addr type
54 *
55 * type - unicast | multicast
56 * scope - local | site | global
57 * v4 - compat
58 * v4mapped
59 * any
60 * loopback
61 */
62
63 #define IPV6_ADDR_ANY 0x0000U
64
65 #define IPV6_ADDR_UNICAST 0x0001U
66 #define IPV6_ADDR_MULTICAST 0x0002U
67
68 #define IPV6_ADDR_LOOPBACK 0x0010U
69 #define IPV6_ADDR_LINKLOCAL 0x0020U
70 #define IPV6_ADDR_SITELOCAL 0x0040U
71
72 #define IPV6_ADDR_COMPATv4 0x0080U
73
74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
75
76 #define IPV6_ADDR_MAPPED 0x1000U
77
78 /*
79 * Addr scopes
80 */
81 #define IPV6_ADDR_MC_SCOPE(a) \
82 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
83 #define __IPV6_ADDR_SCOPE_INVALID -1
84 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
85 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
86 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
87 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
88 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
89
90 /*
91 * Addr flags
92 */
93 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
94 ((a)->s6_addr[1] & 0x10)
95 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
96 ((a)->s6_addr[1] & 0x20)
97 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
98 ((a)->s6_addr[1] & 0x40)
99
100 /*
101 * fragmentation header
102 */
103
104 struct frag_hdr {
105 __u8 nexthdr;
106 __u8 reserved;
107 __be16 frag_off;
108 __be32 identification;
109 };
110
111 #define IP6_MF 0x0001
112
113 #include <net/sock.h>
114
115 /* sysctls */
116 extern int sysctl_mld_max_msf;
117
118 #define _DEVINC(net, statname, modifier, idev, field) \
119 ({ \
120 struct inet6_dev *_idev = (idev); \
121 if (likely(_idev != NULL)) \
122 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
123 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
124 })
125
126 /* per device counters are atomic_long_t */
127 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
128 ({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
132 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
133 })
134
135 /* per device and per net counters are atomic_long_t */
136 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
137 ({ \
138 struct inet6_dev *_idev = (idev); \
139 if (likely(_idev != NULL)) \
140 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
141 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
142 })
143
144 #define _DEVADD(net, statname, modifier, idev, field, val) \
145 ({ \
146 struct inet6_dev *_idev = (idev); \
147 if (likely(_idev != NULL)) \
148 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
149 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
150 })
151
152 #define _DEVUPD(net, statname, modifier, idev, field, val) \
153 ({ \
154 struct inet6_dev *_idev = (idev); \
155 if (likely(_idev != NULL)) \
156 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
157 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
158 })
159
160 /* MIBs */
161
162 #define IP6_INC_STATS(net, idev,field) \
163 _DEVINC(net, ipv6, 64, idev, field)
164 #define IP6_INC_STATS_BH(net, idev,field) \
165 _DEVINC(net, ipv6, 64_BH, idev, field)
166 #define IP6_ADD_STATS(net, idev,field,val) \
167 _DEVADD(net, ipv6, 64, idev, field, val)
168 #define IP6_ADD_STATS_BH(net, idev,field,val) \
169 _DEVADD(net, ipv6, 64_BH, idev, field, val)
170 #define IP6_UPD_PO_STATS(net, idev,field,val) \
171 _DEVUPD(net, ipv6, 64, idev, field, val)
172 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
173 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
174 #define ICMP6_INC_STATS(net, idev, field) \
175 _DEVINCATOMIC(net, icmpv6, , idev, field)
176 #define ICMP6_INC_STATS_BH(net, idev, field) \
177 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
178
179 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
180 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
181 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
183 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
185
186 struct ip6_ra_chain {
187 struct ip6_ra_chain *next;
188 struct sock *sk;
189 int sel;
190 void (*destructor)(struct sock *);
191 };
192
193 extern struct ip6_ra_chain *ip6_ra_chain;
194 extern rwlock_t ip6_ra_lock;
195
196 /*
197 This structure is prepared by protocol, when parsing
198 ancillary data and passed to IPv6.
199 */
200
201 struct ipv6_txoptions {
202 /* Length of this structure */
203 int tot_len;
204
205 /* length of extension headers */
206
207 __u16 opt_flen; /* after fragment hdr */
208 __u16 opt_nflen; /* before fragment hdr */
209
210 struct ipv6_opt_hdr *hopopt;
211 struct ipv6_opt_hdr *dst0opt;
212 struct ipv6_rt_hdr *srcrt; /* Routing Header */
213 struct ipv6_opt_hdr *dst1opt;
214
215 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
216 };
217
218 struct ip6_flowlabel {
219 struct ip6_flowlabel *next;
220 __be32 label;
221 atomic_t users;
222 struct in6_addr dst;
223 struct ipv6_txoptions *opt;
224 unsigned long linger;
225 u8 share;
226 union {
227 struct pid *pid;
228 kuid_t uid;
229 } owner;
230 unsigned long lastuse;
231 unsigned long expires;
232 struct net *fl_net;
233 };
234
235 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
236 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
237
238 struct ipv6_fl_socklist {
239 struct ipv6_fl_socklist *next;
240 struct ip6_flowlabel *fl;
241 };
242
243 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
244 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
245 struct ip6_flowlabel * fl,
246 struct ipv6_txoptions * fopt);
247 extern void fl6_free_socklist(struct sock *sk);
248 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
249 extern int ip6_flowlabel_init(void);
250 extern void ip6_flowlabel_cleanup(void);
251
252 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
253 {
254 if (fl)
255 atomic_dec(&fl->users);
256 }
257
258 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
259
260 extern int ip6_ra_control(struct sock *sk, int sel);
261
262 extern int ipv6_parse_hopopts(struct sk_buff *skb);
263
264 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
265 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
266 int newtype,
267 struct ipv6_opt_hdr __user *newopt,
268 int newoptlen);
269 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
270 struct ipv6_txoptions *opt);
271
272 extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
273
274 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
275 {
276 /* If forwarding is enabled, RA are not accepted unless the special
277 * hybrid mode (accept_ra=2) is enabled.
278 */
279 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
280 idev->cnf.accept_ra;
281 }
282
283 #if IS_ENABLED(CONFIG_IPV6)
284 static inline int ip6_frag_nqueues(struct net *net)
285 {
286 return net->ipv6.frags.nqueues;
287 }
288
289 static inline int ip6_frag_mem(struct net *net)
290 {
291 return atomic_read(&net->ipv6.frags.mem);
292 }
293 #endif
294
295 #define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */
296 #define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */
297 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
298
299 extern int __ipv6_addr_type(const struct in6_addr *addr);
300 static inline int ipv6_addr_type(const struct in6_addr *addr)
301 {
302 return __ipv6_addr_type(addr) & 0xffff;
303 }
304
305 static inline int ipv6_addr_scope(const struct in6_addr *addr)
306 {
307 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
308 }
309
310 static inline int __ipv6_addr_src_scope(int type)
311 {
312 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
313 }
314
315 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
316 {
317 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
318 }
319
320 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
321 {
322 return memcmp(a1, a2, sizeof(struct in6_addr));
323 }
324
325 static inline bool
326 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
327 const struct in6_addr *a2)
328 {
329 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
330 const unsigned long *ul1 = (const unsigned long *)a1;
331 const unsigned long *ulm = (const unsigned long *)m;
332 const unsigned long *ul2 = (const unsigned long *)a2;
333
334 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
335 ((ul1[1] ^ ul2[1]) & ulm[1]));
336 #else
337 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
338 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
339 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
340 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
341 #endif
342 }
343
344 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
345 const struct in6_addr *addr,
346 int plen)
347 {
348 /* caller must guarantee 0 <= plen <= 128 */
349 int o = plen >> 3,
350 b = plen & 0x7;
351
352 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
353 memcpy(pfx->s6_addr, addr, o);
354 if (b != 0)
355 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
356 }
357
358 static inline void __ipv6_addr_set_half(__be32 *addr,
359 __be32 wh, __be32 wl)
360 {
361 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
362 #if defined(__BIG_ENDIAN)
363 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
364 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
365 return;
366 }
367 #elif defined(__LITTLE_ENDIAN)
368 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
369 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
370 return;
371 }
372 #endif
373 #endif
374 addr[0] = wh;
375 addr[1] = wl;
376 }
377
378 static inline void ipv6_addr_set(struct in6_addr *addr,
379 __be32 w1, __be32 w2,
380 __be32 w3, __be32 w4)
381 {
382 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
383 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
384 }
385
386 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
387 const struct in6_addr *a2)
388 {
389 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
390 const unsigned long *ul1 = (const unsigned long *)a1;
391 const unsigned long *ul2 = (const unsigned long *)a2;
392
393 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
394 #else
395 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
396 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
397 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
398 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
399 #endif
400 }
401
402 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
403 const struct in6_addr *addr2,
404 unsigned int prefixlen)
405 {
406 const __be32 *a1 = addr1->s6_addr32;
407 const __be32 *a2 = addr2->s6_addr32;
408 unsigned int pdw, pbi;
409
410 /* check complete u32 in prefix */
411 pdw = prefixlen >> 5;
412 if (pdw && memcmp(a1, a2, pdw << 2))
413 return false;
414
415 /* check incomplete u32 in prefix */
416 pbi = prefixlen & 0x1f;
417 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
418 return false;
419
420 return true;
421 }
422
423 struct inet_frag_queue;
424
425 enum ip6_defrag_users {
426 IP6_DEFRAG_LOCAL_DELIVER,
427 IP6_DEFRAG_CONNTRACK_IN,
428 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
429 IP6_DEFRAG_CONNTRACK_OUT,
430 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
431 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
432 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
433 };
434
435 struct ip6_create_arg {
436 __be32 id;
437 u32 user;
438 const struct in6_addr *src;
439 const struct in6_addr *dst;
440 };
441
442 void ip6_frag_init(struct inet_frag_queue *q, void *a);
443 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
444
445 /*
446 * Equivalent of ipv4 struct ip
447 */
448 struct frag_queue {
449 struct inet_frag_queue q;
450
451 __be32 id; /* fragment id */
452 u32 user;
453 struct in6_addr saddr;
454 struct in6_addr daddr;
455
456 int iif;
457 unsigned int csum;
458 __u16 nhoffset;
459 };
460
461 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
462 struct inet_frags *frags);
463
464 static inline bool ipv6_addr_any(const struct in6_addr *a)
465 {
466 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
467 const unsigned long *ul = (const unsigned long *)a;
468
469 return (ul[0] | ul[1]) == 0UL;
470 #else
471 return (a->s6_addr32[0] | a->s6_addr32[1] |
472 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
473 #endif
474 }
475
476 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
477 {
478 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
479 const unsigned long *ul = (const unsigned long *)a;
480 unsigned long x = ul[0] ^ ul[1];
481
482 return (u32)(x ^ (x >> 32));
483 #else
484 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
485 a->s6_addr32[2] ^ a->s6_addr32[3]);
486 #endif
487 }
488
489 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
490 {
491 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
492 const unsigned long *ul = (const unsigned long *)a;
493
494 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
495 #else
496 return (a->s6_addr32[0] | a->s6_addr32[1] |
497 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
498 #endif
499 }
500
501 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
502 {
503 return (
504 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
505 *(__be64 *)a |
506 #else
507 (a->s6_addr32[0] | a->s6_addr32[1]) |
508 #endif
509 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
510 }
511
512 /*
513 * Check for a RFC 4843 ORCHID address
514 * (Overlay Routable Cryptographic Hash Identifiers)
515 */
516 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
517 {
518 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
519 }
520
521 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
522 struct in6_addr *v4mapped)
523 {
524 ipv6_addr_set(v4mapped,
525 0, 0,
526 htonl(0x0000FFFF),
527 addr);
528 }
529
530 /*
531 * find the first different bit between two addresses
532 * length of address must be a multiple of 32bits
533 */
534 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
535 {
536 const __be32 *a1 = token1, *a2 = token2;
537 int i;
538
539 addrlen >>= 2;
540
541 for (i = 0; i < addrlen; i++) {
542 __be32 xb = a1[i] ^ a2[i];
543 if (xb)
544 return i * 32 + 31 - __fls(ntohl(xb));
545 }
546
547 /*
548 * we should *never* get to this point since that
549 * would mean the addrs are equal
550 *
551 * However, we do get to it 8) And exacly, when
552 * addresses are equal 8)
553 *
554 * ip route add 1111::/128 via ...
555 * ip route add 1111::/64 via ...
556 * and we are here.
557 *
558 * Ideally, this function should stop comparison
559 * at prefix length. It does not, but it is still OK,
560 * if returned value is greater than prefix length.
561 * --ANK (980803)
562 */
563 return addrlen << 5;
564 }
565
566 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
567 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
568 {
569 const __be64 *a1 = token1, *a2 = token2;
570 int i;
571
572 addrlen >>= 3;
573
574 for (i = 0; i < addrlen; i++) {
575 __be64 xb = a1[i] ^ a2[i];
576 if (xb)
577 return i * 64 + 63 - __fls(be64_to_cpu(xb));
578 }
579
580 return addrlen << 6;
581 }
582 #endif
583
584 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
585 {
586 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
587 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
588 return __ipv6_addr_diff64(token1, token2, addrlen);
589 #endif
590 return __ipv6_addr_diff32(token1, token2, addrlen);
591 }
592
593 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
594 {
595 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
596 }
597
598 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
599
600 /*
601 * Header manipulation
602 */
603 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
604 __be32 flowlabel)
605 {
606 *(__be32 *)hdr = ntohl(0x60000000 | (tclass << 20)) | flowlabel;
607 }
608
609 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
610 {
611 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
612 }
613
614 /*
615 * Prototypes exported by ipv6
616 */
617
618 /*
619 * rcv function (called from netdevice level)
620 */
621
622 extern int ipv6_rcv(struct sk_buff *skb,
623 struct net_device *dev,
624 struct packet_type *pt,
625 struct net_device *orig_dev);
626
627 extern int ip6_rcv_finish(struct sk_buff *skb);
628
629 /*
630 * upper-layer output functions
631 */
632 extern int ip6_xmit(struct sock *sk,
633 struct sk_buff *skb,
634 struct flowi6 *fl6,
635 struct ipv6_txoptions *opt,
636 int tclass);
637
638 extern int ip6_nd_hdr(struct sock *sk,
639 struct sk_buff *skb,
640 struct net_device *dev,
641 const struct in6_addr *saddr,
642 const struct in6_addr *daddr,
643 int proto, int len);
644
645 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
646
647 extern int ip6_append_data(struct sock *sk,
648 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
649 void *from,
650 int length,
651 int transhdrlen,
652 int hlimit,
653 int tclass,
654 struct ipv6_txoptions *opt,
655 struct flowi6 *fl6,
656 struct rt6_info *rt,
657 unsigned int flags,
658 int dontfrag);
659
660 extern int ip6_push_pending_frames(struct sock *sk);
661
662 extern void ip6_flush_pending_frames(struct sock *sk);
663
664 extern int ip6_dst_lookup(struct sock *sk,
665 struct dst_entry **dst,
666 struct flowi6 *fl6);
667 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
668 struct flowi6 *fl6,
669 const struct in6_addr *final_dst,
670 bool can_sleep);
671 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
672 struct flowi6 *fl6,
673 const struct in6_addr *final_dst,
674 bool can_sleep);
675 extern struct dst_entry * ip6_blackhole_route(struct net *net,
676 struct dst_entry *orig_dst);
677
678 /*
679 * skb processing functions
680 */
681
682 extern int ip6_output(struct sk_buff *skb);
683 extern int ip6_forward(struct sk_buff *skb);
684 extern int ip6_input(struct sk_buff *skb);
685 extern int ip6_mc_input(struct sk_buff *skb);
686
687 extern int __ip6_local_out(struct sk_buff *skb);
688 extern int ip6_local_out(struct sk_buff *skb);
689
690 /*
691 * Extension header (options) processing
692 */
693
694 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
695 struct ipv6_txoptions *opt,
696 u8 *proto,
697 struct in6_addr **daddr_p);
698 extern void ipv6_push_frag_opts(struct sk_buff *skb,
699 struct ipv6_txoptions *opt,
700 u8 *proto);
701
702 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
703 u8 *nexthdrp, __be16 *frag_offp);
704
705 extern bool ipv6_ext_hdr(u8 nexthdr);
706
707 enum {
708 IP6_FH_F_FRAG = (1 << 0),
709 IP6_FH_F_AUTH = (1 << 1),
710 IP6_FH_F_SKIP_RH = (1 << 2),
711 };
712
713 /* find specified header and get offset to it */
714 extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
715 int target, unsigned short *fragoff, int *fragflg);
716
717 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
718
719 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
720 const struct ipv6_txoptions *opt,
721 struct in6_addr *orig);
722
723 /*
724 * socket options (ipv6_sockglue.c)
725 */
726
727 extern int ipv6_setsockopt(struct sock *sk, int level,
728 int optname,
729 char __user *optval,
730 unsigned int optlen);
731 extern int ipv6_getsockopt(struct sock *sk, int level,
732 int optname,
733 char __user *optval,
734 int __user *optlen);
735 extern int compat_ipv6_setsockopt(struct sock *sk,
736 int level,
737 int optname,
738 char __user *optval,
739 unsigned int optlen);
740 extern int compat_ipv6_getsockopt(struct sock *sk,
741 int level,
742 int optname,
743 char __user *optval,
744 int __user *optlen);
745
746 extern int ip6_datagram_connect(struct sock *sk,
747 struct sockaddr *addr, int addr_len);
748
749 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
750 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
751 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
752 u32 info, u8 *payload);
753 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
754 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
755
756 extern int inet6_release(struct socket *sock);
757 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
758 int addr_len);
759 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
760 int *uaddr_len, int peer);
761 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
762 unsigned long arg);
763
764 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
765 struct sock *sk);
766
767 /*
768 * reassembly.c
769 */
770 extern const struct proto_ops inet6_stream_ops;
771 extern const struct proto_ops inet6_dgram_ops;
772
773 struct group_source_req;
774 struct group_filter;
775
776 extern int ip6_mc_source(int add, int omode, struct sock *sk,
777 struct group_source_req *pgsr);
778 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
779 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
780 struct group_filter __user *optval,
781 int __user *optlen);
782 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
783 const struct in6_addr *daddr, u32 rnd);
784
785 #ifdef CONFIG_PROC_FS
786 extern int ac6_proc_init(struct net *net);
787 extern void ac6_proc_exit(struct net *net);
788 extern int raw6_proc_init(void);
789 extern void raw6_proc_exit(void);
790 extern int tcp6_proc_init(struct net *net);
791 extern void tcp6_proc_exit(struct net *net);
792 extern int udp6_proc_init(struct net *net);
793 extern void udp6_proc_exit(struct net *net);
794 extern int udplite6_proc_init(void);
795 extern void udplite6_proc_exit(void);
796 extern int ipv6_misc_proc_init(void);
797 extern void ipv6_misc_proc_exit(void);
798 extern int snmp6_register_dev(struct inet6_dev *idev);
799 extern int snmp6_unregister_dev(struct inet6_dev *idev);
800
801 #else
802 static inline int ac6_proc_init(struct net *net) { return 0; }
803 static inline void ac6_proc_exit(struct net *net) { }
804 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
805 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
806 #endif
807
808 #ifdef CONFIG_SYSCTL
809 extern ctl_table ipv6_route_table_template[];
810 extern ctl_table ipv6_icmp_table_template[];
811
812 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
813 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
814 extern int ipv6_sysctl_register(void);
815 extern void ipv6_sysctl_unregister(void);
816 #endif
817
818 #endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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