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ipv6.h
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1 /*
2  * Linux INET6 implementation
3  *
4  * Authors:
5  * Pedro Roque <[email protected]>
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 #if IS_ENABLED(CONFIG_IPV6)
275 static inline int ip6_frag_nqueues(struct net *net)
276 {
277  return net->ipv6.frags.nqueues;
278 }
279 
280 static inline int ip6_frag_mem(struct net *net)
281 {
282  return atomic_read(&net->ipv6.frags.mem);
283 }
284 #endif
285 
286 #define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */
287 #define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */
288 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
289 
290 extern int __ipv6_addr_type(const struct in6_addr *addr);
291 static inline int ipv6_addr_type(const struct in6_addr *addr)
292 {
293  return __ipv6_addr_type(addr) & 0xffff;
294 }
295 
296 static inline int ipv6_addr_scope(const struct in6_addr *addr)
297 {
298  return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
299 }
300 
301 static inline int __ipv6_addr_src_scope(int type)
302 {
303  return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
304 }
305 
306 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
307 {
308  return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
309 }
310 
311 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
312 {
313  return memcmp(a1, a2, sizeof(struct in6_addr));
314 }
315 
316 static inline bool
317 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
318  const struct in6_addr *a2)
319 {
320 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
321  const unsigned long *ul1 = (const unsigned long *)a1;
322  const unsigned long *ulm = (const unsigned long *)m;
323  const unsigned long *ul2 = (const unsigned long *)a2;
324 
325  return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
326  ((ul1[1] ^ ul2[1]) & ulm[1]));
327 #else
328  return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
329  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
330  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
331  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
332 #endif
333 }
334 
335 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
336  const struct in6_addr *addr,
337  int plen)
338 {
339  /* caller must guarantee 0 <= plen <= 128 */
340  int o = plen >> 3,
341  b = plen & 0x7;
342 
343  memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
344  memcpy(pfx->s6_addr, addr, o);
345  if (b != 0)
346  pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
347 }
348 
349 static inline void ipv6_addr_set(struct in6_addr *addr,
350  __be32 w1, __be32 w2,
351  __be32 w3, __be32 w4)
352 {
353  addr->s6_addr32[0] = w1;
354  addr->s6_addr32[1] = w2;
355  addr->s6_addr32[2] = w3;
356  addr->s6_addr32[3] = w4;
357 }
358 
359 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
360  const struct in6_addr *a2)
361 {
362 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
363  const unsigned long *ul1 = (const unsigned long *)a1;
364  const unsigned long *ul2 = (const unsigned long *)a2;
365 
366  return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
367 #else
368  return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
369  (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
370  (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
371  (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
372 #endif
373 }
374 
375 static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
376  unsigned int prefixlen)
377 {
378  unsigned int pdw, pbi;
379 
380  /* check complete u32 in prefix */
381  pdw = prefixlen >> 5;
382  if (pdw && memcmp(a1, a2, pdw << 2))
383  return false;
384 
385  /* check incomplete u32 in prefix */
386  pbi = prefixlen & 0x1f;
387  if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
388  return false;
389 
390  return true;
391 }
392 
393 static inline bool ipv6_prefix_equal(const struct in6_addr *a1,
394  const struct in6_addr *a2,
395  unsigned int prefixlen)
396 {
397  return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
398  prefixlen);
399 }
400 
401 struct inet_frag_queue;
402 
403 enum ip6_defrag_users {
404  IP6_DEFRAG_LOCAL_DELIVER,
405  IP6_DEFRAG_CONNTRACK_IN,
406  __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
407  IP6_DEFRAG_CONNTRACK_OUT,
408  __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
409  IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
410  __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
411 };
412 
413 struct ip6_create_arg {
414  __be32 id;
415  u32 user;
416  const struct in6_addr *src;
417  const struct in6_addr *dst;
418 };
419 
420 void ip6_frag_init(struct inet_frag_queue *q, void *a);
421 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
422 
423 /*
424  * Equivalent of ipv4 struct ip
425  */
426 struct frag_queue {
427  struct inet_frag_queue q;
428 
429  __be32 id; /* fragment id */
430  u32 user;
431  struct in6_addr saddr;
432  struct in6_addr daddr;
433 
434  int iif;
435  unsigned int csum;
436  __u16 nhoffset;
437 };
438 
439 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
440  struct inet_frags *frags);
441 
442 static inline bool ipv6_addr_any(const struct in6_addr *a)
443 {
444 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
445  const unsigned long *ul = (const unsigned long *)a;
446 
447  return (ul[0] | ul[1]) == 0UL;
448 #else
449  return (a->s6_addr32[0] | a->s6_addr32[1] |
450  a->s6_addr32[2] | a->s6_addr32[3]) == 0;
451 #endif
452 }
453 
454 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
455 {
456 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
457  const unsigned long *ul = (const unsigned long *)a;
458  unsigned long x = ul[0] ^ ul[1];
459 
460  return (u32)(x ^ (x >> 32));
461 #else
462  return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
463  a->s6_addr32[2] ^ a->s6_addr32[3]);
464 #endif
465 }
466 
467 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
468 {
469  return (a->s6_addr32[0] | a->s6_addr32[1] |
470  a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
471 }
472 
473 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
474 {
475  return (a->s6_addr32[0] | a->s6_addr32[1] |
476  (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
477 }
478 
479 /*
480  * Check for a RFC 4843 ORCHID address
481  * (Overlay Routable Cryptographic Hash Identifiers)
482  */
483 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
484 {
485  return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
486 }
487 
488 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
489  struct in6_addr *v4mapped)
490 {
491  ipv6_addr_set(v4mapped,
492  0, 0,
493  htonl(0x0000FFFF),
494  addr);
495 }
496 
497 /*
498  * find the first different bit between two addresses
499  * length of address must be a multiple of 32bits
500  */
501 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
502 {
503  const __be32 *a1 = token1, *a2 = token2;
504  int i;
505 
506  addrlen >>= 2;
507 
508  for (i = 0; i < addrlen; i++) {
509  __be32 xb = a1[i] ^ a2[i];
510  if (xb)
511  return i * 32 + 31 - __fls(ntohl(xb));
512  }
513 
514  /*
515  * we should *never* get to this point since that
516  * would mean the addrs are equal
517  *
518  * However, we do get to it 8) And exacly, when
519  * addresses are equal 8)
520  *
521  * ip route add 1111::/128 via ...
522  * ip route add 1111::/64 via ...
523  * and we are here.
524  *
525  * Ideally, this function should stop comparison
526  * at prefix length. It does not, but it is still OK,
527  * if returned value is greater than prefix length.
528  * --ANK (980803)
529  */
530  return addrlen << 5;
531 }
532 
533 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
534 {
535  return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
536 }
537 
538 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
539 
540 /*
541  * Prototypes exported by ipv6
542  */
543 
544 /*
545  * rcv function (called from netdevice level)
546  */
547 
548 extern int ipv6_rcv(struct sk_buff *skb,
549  struct net_device *dev,
550  struct packet_type *pt,
551  struct net_device *orig_dev);
552 
553 extern int ip6_rcv_finish(struct sk_buff *skb);
554 
555 /*
556  * upper-layer output functions
557  */
558 extern int ip6_xmit(struct sock *sk,
559  struct sk_buff *skb,
560  struct flowi6 *fl6,
561  struct ipv6_txoptions *opt,
562  int tclass);
563 
564 extern int ip6_nd_hdr(struct sock *sk,
565  struct sk_buff *skb,
566  struct net_device *dev,
567  const struct in6_addr *saddr,
568  const struct in6_addr *daddr,
569  int proto, int len);
570 
571 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
572 
573 extern int ip6_append_data(struct sock *sk,
574  int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
575  void *from,
576  int length,
577  int transhdrlen,
578  int hlimit,
579  int tclass,
580  struct ipv6_txoptions *opt,
581  struct flowi6 *fl6,
582  struct rt6_info *rt,
583  unsigned int flags,
584  int dontfrag);
585 
586 extern int ip6_push_pending_frames(struct sock *sk);
587 
588 extern void ip6_flush_pending_frames(struct sock *sk);
589 
590 extern int ip6_dst_lookup(struct sock *sk,
591  struct dst_entry **dst,
592  struct flowi6 *fl6);
593 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
594  struct flowi6 *fl6,
595  const struct in6_addr *final_dst,
596  bool can_sleep);
597 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
598  struct flowi6 *fl6,
599  const struct in6_addr *final_dst,
600  bool can_sleep);
601 extern struct dst_entry * ip6_blackhole_route(struct net *net,
602  struct dst_entry *orig_dst);
603 
604 /*
605  * skb processing functions
606  */
607 
608 extern int ip6_output(struct sk_buff *skb);
609 extern int ip6_forward(struct sk_buff *skb);
610 extern int ip6_input(struct sk_buff *skb);
611 extern int ip6_mc_input(struct sk_buff *skb);
612 
613 extern int __ip6_local_out(struct sk_buff *skb);
614 extern int ip6_local_out(struct sk_buff *skb);
615 
616 /*
617  * Extension header (options) processing
618  */
619 
620 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
621  struct ipv6_txoptions *opt,
622  u8 *proto,
623  struct in6_addr **daddr_p);
624 extern void ipv6_push_frag_opts(struct sk_buff *skb,
625  struct ipv6_txoptions *opt,
626  u8 *proto);
627 
628 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
629  u8 *nexthdrp, __be16 *frag_offp);
630 
631 extern bool ipv6_ext_hdr(u8 nexthdr);
632 
633 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
634 
635 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
636  const struct ipv6_txoptions *opt,
637  struct in6_addr *orig);
638 
639 /*
640  * socket options (ipv6_sockglue.c)
641  */
642 
643 extern int ipv6_setsockopt(struct sock *sk, int level,
644  int optname,
645  char __user *optval,
646  unsigned int optlen);
647 extern int ipv6_getsockopt(struct sock *sk, int level,
648  int optname,
649  char __user *optval,
650  int __user *optlen);
651 extern int compat_ipv6_setsockopt(struct sock *sk,
652  int level,
653  int optname,
654  char __user *optval,
655  unsigned int optlen);
656 extern int compat_ipv6_getsockopt(struct sock *sk,
657  int level,
658  int optname,
659  char __user *optval,
660  int __user *optlen);
661 
662 extern int ip6_datagram_connect(struct sock *sk,
663  struct sockaddr *addr, int addr_len);
664 
665 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
666 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
667 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
668  u32 info, u8 *payload);
669 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
670 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
671 
672 extern int inet6_release(struct socket *sock);
673 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
674  int addr_len);
675 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
676  int *uaddr_len, int peer);
677 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
678  unsigned long arg);
679 
680 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
681  struct sock *sk);
682 
683 /*
684  * reassembly.c
685  */
686 extern const struct proto_ops inet6_stream_ops;
687 extern const struct proto_ops inet6_dgram_ops;
688 
689 struct group_source_req;
690 struct group_filter;
691 
692 extern int ip6_mc_source(int add, int omode, struct sock *sk,
693  struct group_source_req *pgsr);
694 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
695 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
696  struct group_filter __user *optval,
697  int __user *optlen);
698 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
699  const struct in6_addr *daddr, u32 rnd);
700 
701 #ifdef CONFIG_PROC_FS
702 extern int ac6_proc_init(struct net *net);
703 extern void ac6_proc_exit(struct net *net);
704 extern int raw6_proc_init(void);
705 extern void raw6_proc_exit(void);
706 extern int tcp6_proc_init(struct net *net);
707 extern void tcp6_proc_exit(struct net *net);
708 extern int udp6_proc_init(struct net *net);
709 extern void udp6_proc_exit(struct net *net);
710 extern int udplite6_proc_init(void);
711 extern void udplite6_proc_exit(void);
712 extern int ipv6_misc_proc_init(void);
713 extern void ipv6_misc_proc_exit(void);
714 extern int snmp6_register_dev(struct inet6_dev *idev);
715 extern int snmp6_unregister_dev(struct inet6_dev *idev);
716 
717 #else
718 static inline int ac6_proc_init(struct net *net) { return 0; }
719 static inline void ac6_proc_exit(struct net *net) { }
720 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
721 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
722 #endif
723 
724 #ifdef CONFIG_SYSCTL
725 extern ctl_table ipv6_route_table_template[];
726 extern ctl_table ipv6_icmp_table_template[];
727 
728 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
729 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
730 extern int ipv6_sysctl_register(void);
731 extern void ipv6_sysctl_unregister(void);
732 #endif
733 
734 #endif /* _NET_IPV6_H */
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