Linux kernel mirror (for testing)
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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
104struct 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 */
116extern 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
186struct ip6_ra_chain {
187 struct ip6_ra_chain *next;
188 struct sock *sk;
189 int sel;
190 void (*destructor)(struct sock *);
191};
192
193extern struct ip6_ra_chain *ip6_ra_chain;
194extern 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
201struct 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
218struct 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
238struct ipv6_fl_socklist {
239 struct ipv6_fl_socklist *next;
240 struct ip6_flowlabel *fl;
241};
242
243extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
244extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
245 struct ip6_flowlabel * fl,
246 struct ipv6_txoptions * fopt);
247extern void fl6_free_socklist(struct sock *sk);
248extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
249extern int ip6_flowlabel_init(void);
250extern void ip6_flowlabel_cleanup(void);
251
252static inline void fl6_sock_release(struct ip6_flowlabel *fl)
253{
254 if (fl)
255 atomic_dec(&fl->users);
256}
257
258extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
259
260extern int ip6_ra_control(struct sock *sk, int sel);
261
262extern int ipv6_parse_hopopts(struct sk_buff *skb);
263
264extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
265extern 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);
269struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
270 struct ipv6_txoptions *opt);
271
272extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
273
274static 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)
284static inline int ip6_frag_nqueues(struct net *net)
285{
286 return net->ipv6.frags.nqueues;
287}
288
289static 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
299extern int __ipv6_addr_type(const struct in6_addr *addr);
300static inline int ipv6_addr_type(const struct in6_addr *addr)
301{
302 return __ipv6_addr_type(addr) & 0xffff;
303}
304
305static inline int ipv6_addr_scope(const struct in6_addr *addr)
306{
307 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
308}
309
310static inline int __ipv6_addr_src_scope(int type)
311{
312 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
313}
314
315static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
316{
317 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
318}
319
320static 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
325static inline bool
326ipv6_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
344static 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
358static inline void ipv6_addr_set(struct in6_addr *addr,
359 __be32 w1, __be32 w2,
360 __be32 w3, __be32 w4)
361{
362 addr->s6_addr32[0] = w1;
363 addr->s6_addr32[1] = w2;
364 addr->s6_addr32[2] = w3;
365 addr->s6_addr32[3] = w4;
366}
367
368static inline bool ipv6_addr_equal(const struct in6_addr *a1,
369 const struct in6_addr *a2)
370{
371#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
372 const unsigned long *ul1 = (const unsigned long *)a1;
373 const unsigned long *ul2 = (const unsigned long *)a2;
374
375 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
376#else
377 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
378 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
379 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
380 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
381#endif
382}
383
384static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
385 unsigned int prefixlen)
386{
387 unsigned int pdw, pbi;
388
389 /* check complete u32 in prefix */
390 pdw = prefixlen >> 5;
391 if (pdw && memcmp(a1, a2, pdw << 2))
392 return false;
393
394 /* check incomplete u32 in prefix */
395 pbi = prefixlen & 0x1f;
396 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
397 return false;
398
399 return true;
400}
401
402static inline bool ipv6_prefix_equal(const struct in6_addr *a1,
403 const struct in6_addr *a2,
404 unsigned int prefixlen)
405{
406 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
407 prefixlen);
408}
409
410struct inet_frag_queue;
411
412enum ip6_defrag_users {
413 IP6_DEFRAG_LOCAL_DELIVER,
414 IP6_DEFRAG_CONNTRACK_IN,
415 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
416 IP6_DEFRAG_CONNTRACK_OUT,
417 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
418 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
419 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
420};
421
422struct ip6_create_arg {
423 __be32 id;
424 u32 user;
425 const struct in6_addr *src;
426 const struct in6_addr *dst;
427};
428
429void ip6_frag_init(struct inet_frag_queue *q, void *a);
430bool ip6_frag_match(struct inet_frag_queue *q, void *a);
431
432/*
433 * Equivalent of ipv4 struct ip
434 */
435struct frag_queue {
436 struct inet_frag_queue q;
437
438 __be32 id; /* fragment id */
439 u32 user;
440 struct in6_addr saddr;
441 struct in6_addr daddr;
442
443 int iif;
444 unsigned int csum;
445 __u16 nhoffset;
446};
447
448void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
449 struct inet_frags *frags);
450
451static inline bool ipv6_addr_any(const struct in6_addr *a)
452{
453#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
454 const unsigned long *ul = (const unsigned long *)a;
455
456 return (ul[0] | ul[1]) == 0UL;
457#else
458 return (a->s6_addr32[0] | a->s6_addr32[1] |
459 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
460#endif
461}
462
463static inline u32 ipv6_addr_hash(const struct in6_addr *a)
464{
465#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
466 const unsigned long *ul = (const unsigned long *)a;
467 unsigned long x = ul[0] ^ ul[1];
468
469 return (u32)(x ^ (x >> 32));
470#else
471 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
472 a->s6_addr32[2] ^ a->s6_addr32[3]);
473#endif
474}
475
476static inline bool ipv6_addr_loopback(const struct in6_addr *a)
477{
478 return (a->s6_addr32[0] | a->s6_addr32[1] |
479 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
480}
481
482static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
483{
484 return (a->s6_addr32[0] | a->s6_addr32[1] |
485 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
486}
487
488/*
489 * Check for a RFC 4843 ORCHID address
490 * (Overlay Routable Cryptographic Hash Identifiers)
491 */
492static inline bool ipv6_addr_orchid(const struct in6_addr *a)
493{
494 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
495}
496
497static inline void ipv6_addr_set_v4mapped(const __be32 addr,
498 struct in6_addr *v4mapped)
499{
500 ipv6_addr_set(v4mapped,
501 0, 0,
502 htonl(0x0000FFFF),
503 addr);
504}
505
506/*
507 * find the first different bit between two addresses
508 * length of address must be a multiple of 32bits
509 */
510static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
511{
512 const __be32 *a1 = token1, *a2 = token2;
513 int i;
514
515 addrlen >>= 2;
516
517 for (i = 0; i < addrlen; i++) {
518 __be32 xb = a1[i] ^ a2[i];
519 if (xb)
520 return i * 32 + 31 - __fls(ntohl(xb));
521 }
522
523 /*
524 * we should *never* get to this point since that
525 * would mean the addrs are equal
526 *
527 * However, we do get to it 8) And exacly, when
528 * addresses are equal 8)
529 *
530 * ip route add 1111::/128 via ...
531 * ip route add 1111::/64 via ...
532 * and we are here.
533 *
534 * Ideally, this function should stop comparison
535 * at prefix length. It does not, but it is still OK,
536 * if returned value is greater than prefix length.
537 * --ANK (980803)
538 */
539 return addrlen << 5;
540}
541
542static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
543{
544 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
545}
546
547extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
548
549/*
550 * Prototypes exported by ipv6
551 */
552
553/*
554 * rcv function (called from netdevice level)
555 */
556
557extern int ipv6_rcv(struct sk_buff *skb,
558 struct net_device *dev,
559 struct packet_type *pt,
560 struct net_device *orig_dev);
561
562extern int ip6_rcv_finish(struct sk_buff *skb);
563
564/*
565 * upper-layer output functions
566 */
567extern int ip6_xmit(struct sock *sk,
568 struct sk_buff *skb,
569 struct flowi6 *fl6,
570 struct ipv6_txoptions *opt,
571 int tclass);
572
573extern int ip6_nd_hdr(struct sock *sk,
574 struct sk_buff *skb,
575 struct net_device *dev,
576 const struct in6_addr *saddr,
577 const struct in6_addr *daddr,
578 int proto, int len);
579
580extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
581
582extern int ip6_append_data(struct sock *sk,
583 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
584 void *from,
585 int length,
586 int transhdrlen,
587 int hlimit,
588 int tclass,
589 struct ipv6_txoptions *opt,
590 struct flowi6 *fl6,
591 struct rt6_info *rt,
592 unsigned int flags,
593 int dontfrag);
594
595extern int ip6_push_pending_frames(struct sock *sk);
596
597extern void ip6_flush_pending_frames(struct sock *sk);
598
599extern int ip6_dst_lookup(struct sock *sk,
600 struct dst_entry **dst,
601 struct flowi6 *fl6);
602extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
603 struct flowi6 *fl6,
604 const struct in6_addr *final_dst,
605 bool can_sleep);
606extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
607 struct flowi6 *fl6,
608 const struct in6_addr *final_dst,
609 bool can_sleep);
610extern struct dst_entry * ip6_blackhole_route(struct net *net,
611 struct dst_entry *orig_dst);
612
613/*
614 * skb processing functions
615 */
616
617extern int ip6_output(struct sk_buff *skb);
618extern int ip6_forward(struct sk_buff *skb);
619extern int ip6_input(struct sk_buff *skb);
620extern int ip6_mc_input(struct sk_buff *skb);
621
622extern int __ip6_local_out(struct sk_buff *skb);
623extern int ip6_local_out(struct sk_buff *skb);
624
625/*
626 * Extension header (options) processing
627 */
628
629extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
630 struct ipv6_txoptions *opt,
631 u8 *proto,
632 struct in6_addr **daddr_p);
633extern void ipv6_push_frag_opts(struct sk_buff *skb,
634 struct ipv6_txoptions *opt,
635 u8 *proto);
636
637extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
638 u8 *nexthdrp, __be16 *frag_offp);
639
640extern bool ipv6_ext_hdr(u8 nexthdr);
641
642enum {
643 IP6_FH_F_FRAG = (1 << 0),
644 IP6_FH_F_AUTH = (1 << 1),
645 IP6_FH_F_SKIP_RH = (1 << 2),
646};
647
648/* find specified header and get offset to it */
649extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
650 int target, unsigned short *fragoff, int *fragflg);
651
652extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
653
654extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
655 const struct ipv6_txoptions *opt,
656 struct in6_addr *orig);
657
658/*
659 * socket options (ipv6_sockglue.c)
660 */
661
662extern int ipv6_setsockopt(struct sock *sk, int level,
663 int optname,
664 char __user *optval,
665 unsigned int optlen);
666extern int ipv6_getsockopt(struct sock *sk, int level,
667 int optname,
668 char __user *optval,
669 int __user *optlen);
670extern int compat_ipv6_setsockopt(struct sock *sk,
671 int level,
672 int optname,
673 char __user *optval,
674 unsigned int optlen);
675extern int compat_ipv6_getsockopt(struct sock *sk,
676 int level,
677 int optname,
678 char __user *optval,
679 int __user *optlen);
680
681extern int ip6_datagram_connect(struct sock *sk,
682 struct sockaddr *addr, int addr_len);
683
684extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
685extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
686extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
687 u32 info, u8 *payload);
688extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
689extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
690
691extern int inet6_release(struct socket *sock);
692extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
693 int addr_len);
694extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
695 int *uaddr_len, int peer);
696extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
697 unsigned long arg);
698
699extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
700 struct sock *sk);
701
702/*
703 * reassembly.c
704 */
705extern const struct proto_ops inet6_stream_ops;
706extern const struct proto_ops inet6_dgram_ops;
707
708struct group_source_req;
709struct group_filter;
710
711extern int ip6_mc_source(int add, int omode, struct sock *sk,
712 struct group_source_req *pgsr);
713extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
714extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
715 struct group_filter __user *optval,
716 int __user *optlen);
717extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
718 const struct in6_addr *daddr, u32 rnd);
719
720#ifdef CONFIG_PROC_FS
721extern int ac6_proc_init(struct net *net);
722extern void ac6_proc_exit(struct net *net);
723extern int raw6_proc_init(void);
724extern void raw6_proc_exit(void);
725extern int tcp6_proc_init(struct net *net);
726extern void tcp6_proc_exit(struct net *net);
727extern int udp6_proc_init(struct net *net);
728extern void udp6_proc_exit(struct net *net);
729extern int udplite6_proc_init(void);
730extern void udplite6_proc_exit(void);
731extern int ipv6_misc_proc_init(void);
732extern void ipv6_misc_proc_exit(void);
733extern int snmp6_register_dev(struct inet6_dev *idev);
734extern int snmp6_unregister_dev(struct inet6_dev *idev);
735
736#else
737static inline int ac6_proc_init(struct net *net) { return 0; }
738static inline void ac6_proc_exit(struct net *net) { }
739static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
740static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
741#endif
742
743#ifdef CONFIG_SYSCTL
744extern ctl_table ipv6_route_table_template[];
745extern ctl_table ipv6_icmp_table_template[];
746
747extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
748extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
749extern int ipv6_sysctl_register(void);
750extern void ipv6_sysctl_unregister(void);
751#endif
752
753#endif /* _NET_IPV6_H */