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[IPv6] prefix: Convert RTM_NEWPREFIX notifications to use the new netlink api
[net-next-2.6.git] / include / net / ipv6.h
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15#ifndef _NET_IPV6_H
16#define _NET_IPV6_H
17
18#include <linux/ipv6.h>
19#include <linux/hardirq.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_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. */
2b741653 43#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4
LT		 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#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
78
79/*
80 * Addr scopes
81 */
82#ifdef __KERNEL__
83#define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
85#define __IPV6_ADDR_SCOPE_INVALID -1
86#endif
87#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
88#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
89#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
90#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
91#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
92
93/*
94 * fragmentation header
95 */
96
97struct frag_hdr {
44473a6b
AV		 98 __u8 nexthdr;
99 __u8 reserved;
100 __be16 frag_off;
101 __be32 identification;
1da177e4
LT		 102};
103
104#define IP6_MF 0x0001
105
106#ifdef __KERNEL__
107
108#include <net/sock.h>
109
110/* sysctls */
111extern int sysctl_ipv6_bindv6only;
112extern int sysctl_mld_max_msf;
113
114/* MIBs */
115DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
a11d206d
YH		 116#define IP6_INC_STATS(idev,field) ({ \
117 struct inet6_dev *_idev = (idev); \
118 if (likely(_idev != NULL)) \
119 SNMP_INC_STATS(_idev->stats.ipv6, field); \
120 SNMP_INC_STATS(ipv6_statistics, field); \
121})
122#define IP6_INC_STATS_BH(idev,field) ({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \
126 SNMP_INC_STATS_BH(ipv6_statistics, field); \
127})
128#define IP6_INC_STATS_USER(idev,field) ({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_USER(_idev->stats.ipv6, field); \
132 SNMP_INC_STATS_USER(ipv6_statistics, field); \
133})
1da177e4
LT		 134DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
135#define ICMP6_INC_STATS(idev, field) ({ \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS(idev->stats.icmpv6, field); \
139 SNMP_INC_STATS(icmpv6_statistics, field); \
140})
141#define ICMP6_INC_STATS_BH(idev, field) ({ \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
145 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
146})
147#define ICMP6_INC_STATS_USER(idev, field) ({ \
148 struct inet6_dev *_idev = (idev); \
149 if (likely(_idev != NULL)) \
150 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
151 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
152})
153#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
154 struct inet6_dev *_idev = idev; \
155 __typeof__(offset) _offset = (offset); \
156 if (likely(_idev != NULL)) \
157 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
158 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
159})
160DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
161#define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
162#define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
163#define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
1da177e4
LT		 164
165int snmp6_register_dev(struct inet6_dev *idev);
166int snmp6_unregister_dev(struct inet6_dev *idev);
167int snmp6_alloc_dev(struct inet6_dev *idev);
168int snmp6_free_dev(struct inet6_dev *idev);
169int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
170void snmp6_mib_free(void *ptr[2]);
171
172struct ip6_ra_chain
173{
174 struct ip6_ra_chain *next;
175 struct sock *sk;
176 int sel;
177 void (*destructor)(struct sock *);
178};
179
180extern struct ip6_ra_chain *ip6_ra_chain;
181extern rwlock_t ip6_ra_lock;
182
183/*
184 This structure is prepared by protocol, when parsing
185 ancillary data and passed to IPv6.
186 */
187
188struct ipv6_txoptions
189{
190 /* Length of this structure */
191 int tot_len;
192
193 /* length of extension headers */
194
195 __u16 opt_flen; /* after fragment hdr */
196 __u16 opt_nflen; /* before fragment hdr */
197
198 struct ipv6_opt_hdr *hopopt;
199 struct ipv6_opt_hdr *dst0opt;
200 struct ipv6_rt_hdr *srcrt; /* Routing Header */
1da177e4
LT		 201 struct ipv6_opt_hdr *dst1opt;
202
203 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
204};
205
206struct ip6_flowlabel
207{
208 struct ip6_flowlabel *next;
90bcaf7b 209 __be32 label;
1da177e4
LT		 210 struct in6_addr dst;
211 struct ipv6_txoptions *opt;
212 atomic_t users;
213 unsigned long linger;
214 u8 share;
215 u32 owner;
216 unsigned long lastuse;
217 unsigned long expires;
218};
219
220#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
221#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
222
223struct ipv6_fl_socklist
224{
225 struct ipv6_fl_socklist *next;
226 struct ip6_flowlabel *fl;
227};
228
90bcaf7b 229extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
1da177e4
LT		 230extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
231 struct ip6_flowlabel * fl,
232 struct ipv6_txoptions * fopt);
233extern void fl6_free_socklist(struct sock *sk);
234extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
235extern void ip6_flowlabel_init(void);
236extern void ip6_flowlabel_cleanup(void);
237
238static inline void fl6_sock_release(struct ip6_flowlabel *fl)
239{
240 if (fl)
241 atomic_dec(&fl->users);
242}
243
244extern int ip6_ra_control(struct sock *sk, int sel,
245 void (*destructor)(struct sock *));
246
247
a80ff03e 248extern int ipv6_parse_hopopts(struct sk_buff **skbp);
1da177e4
LT		 249
250extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
333fad53
YH		 251extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
252 int newtype,
253 struct ipv6_opt_hdr __user *newopt,
254 int newoptlen);
df9890c3
YH		 255struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
256 struct ipv6_txoptions *opt);
1da177e4 257
399c07de
ACM		 258extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
259
1da177e4
LT		 260extern int ip6_frag_nqueues;
261extern atomic_t ip6_frag_mem;
262
263#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
264
265/*
266 * Function prototype for build_xmit
267 */
268
269typedef int (*inet_getfrag_t) (const void *data,
270 struct in6_addr *addr,
271 char *,
272 unsigned int, unsigned int);
273
b1cacb68
YH		 274extern int __ipv6_addr_type(const struct in6_addr *addr);
275static inline int ipv6_addr_type(const struct in6_addr *addr)
276{
277 return __ipv6_addr_type(addr) & 0xffff;
278}
1da177e4
LT		 279
280static inline int ipv6_addr_scope(const struct in6_addr *addr)
281{
b1cacb68
YH		 282 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
283}
284
285static inline int __ipv6_addr_src_scope(int type)
286{
287 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
288}
289
290static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
291{
292 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 293}
294
295static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
296{
297 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
298}
299
f2ffd9ee
PM		 300static inline int
301ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
302 const struct in6_addr *a2)
303{
304 unsigned int i;
305
306 for (i = 0; i < 4; i++)
307 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
308 return 1;
309 return 0;
310}
311
1da177e4
LT		 312static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
313{
314 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
315}
316
317static inline void ipv6_addr_prefix(struct in6_addr *pfx,
318 const struct in6_addr *addr,
319 int plen)
320{
321 /* caller must guarantee 0 <= plen <= 128 */
322 int o = plen >> 3,
323 b = plen & 0x7;
324
325 memcpy(pfx->s6_addr, addr, o);
326 if (b != 0) {
327 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
328 o++;
329 }
330 if (o < 16)
331 memset(pfx->s6_addr + o, 0, 16 - o);
332}
333
334#ifndef __HAVE_ARCH_ADDR_SET
335static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 336 __be32 w1, __be32 w2,
337 __be32 w3, __be32 w4)
1da177e4
LT		 338{
339 addr->s6_addr32[0] = w1;
340 addr->s6_addr32[1] = w2;
341 addr->s6_addr32[2] = w3;
342 addr->s6_addr32[3] = w4;
343}
344#endif
345
346static inline int ipv6_addr_equal(const struct in6_addr *a1,
347 const struct in6_addr *a2)
348{
349 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
350 a1->s6_addr32[1] == a2->s6_addr32[1] &&
351 a1->s6_addr32[2] == a2->s6_addr32[2] &&
352 a1->s6_addr32[3] == a2->s6_addr32[3]);
353}
354
48818f82 355static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
1da177e4
LT		 356 unsigned int prefixlen)
357{
358 unsigned pdw, pbi;
359
360 /* check complete u32 in prefix */
361 pdw = prefixlen >> 5;
362 if (pdw && memcmp(a1, a2, pdw << 2))
363 return 0;
364
365 /* check incomplete u32 in prefix */
366 pbi = prefixlen & 0x1f;
367 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
368 return 0;
369
370 return 1;
371}
372
373static inline int ipv6_prefix_equal(const struct in6_addr *a1,
374 const struct in6_addr *a2,
375 unsigned int prefixlen)
376{
377 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
378 prefixlen);
379}
380
381static inline int ipv6_addr_any(const struct in6_addr *a)
382{
383 return ((a->s6_addr32[0] | a->s6_addr32[1] |
384 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
385}
386
971f359d
YH		 387/*
388 * find the first different bit between two addresses
389 * length of address must be a multiple of 32bits
390 */
391static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
392{
393 const __u32 *a1 = token1, *a2 = token2;
394 int i;
395
396 addrlen >>= 2;
397
398 for (i = 0; i < addrlen; i++) {
399 __u32 xb = a1[i] ^ a2[i];
400 if (xb) {
401 int j = 31;
402
403 xb = ntohl(xb);
404 while ((xb & (1 << j)) == 0)
405 j--;
406
407 return (i * 32 + 31 - j);
408 }
409 }
410
411 /*
412 * we should *never* get to this point since that
413 * would mean the addrs are equal
414 *
415 * However, we do get to it 8) And exacly, when
416 * addresses are equal 8)
417 *
418 * ip route add 1111::/128 via ...
419 * ip route add 1111::/64 via ...
420 * and we are here.
421 *
422 * Ideally, this function should stop comparison
423 * at prefix length. It does not, but it is still OK,
424 * if returned value is greater than prefix length.
425 * --ANK (980803)
426 */
427 return (addrlen << 5);
428}
429
430static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
431{
432 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
433}
434
1da177e4
LT		 435/*
436 * Prototypes exported by ipv6
437 */
438
439/*
440 * rcv function (called from netdevice level)
441 */
442
443extern int ipv6_rcv(struct sk_buff *skb,
444 struct net_device *dev,
f2ccd8fa
DM		 445 struct packet_type *pt,
446 struct net_device *orig_dev);
1da177e4 447
b05e1066
PM		 448extern int ip6_rcv_finish(struct sk_buff *skb);
449
1da177e4
LT		 450/*
451 * upper-layer output functions
452 */
453extern int ip6_xmit(struct sock *sk,
454 struct sk_buff *skb,
455 struct flowi *fl,
456 struct ipv6_txoptions *opt,
457 int ipfragok);
458
459extern int ip6_nd_hdr(struct sock *sk,
460 struct sk_buff *skb,
461 struct net_device *dev,
462 struct in6_addr *saddr,
463 struct in6_addr *daddr,
464 int proto, int len);
465
466extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
467
468extern int ip6_append_data(struct sock *sk,
469 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
470 void *from,
471 int length,
472 int transhdrlen,
473 int hlimit,
41a1f8ea 474 int tclass,
1da177e4
LT		 475 struct ipv6_txoptions *opt,
476 struct flowi *fl,
477 struct rt6_info *rt,
478 unsigned int flags);
479
480extern int ip6_push_pending_frames(struct sock *sk);
481
482extern void ip6_flush_pending_frames(struct sock *sk);
483
484extern int ip6_dst_lookup(struct sock *sk,
485 struct dst_entry **dst,
486 struct flowi *fl);
497c615a
HX		 487extern int ip6_sk_dst_lookup(struct sock *sk,
488 struct dst_entry **dst,
489 struct flowi *fl);
1da177e4
LT		 490
491/*
492 * skb processing functions
493 */
494
495extern int ip6_output(struct sk_buff *skb);
496extern int ip6_forward(struct sk_buff *skb);
497extern int ip6_input(struct sk_buff *skb);
498extern int ip6_mc_input(struct sk_buff *skb);
499
500/*
501 * Extension header (options) processing
502 */
503
504extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
505 u8 *prev_hdr,
506 struct ipv6_txoptions *opt,
507 struct in6_addr *daddr,
508 u32 jumbolen);
509extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
510 u8 *prev_hdr,
511 struct ipv6_txoptions *opt);
512extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
513 struct ipv6_txoptions *opt,
514 u8 *proto,
515 struct in6_addr **daddr_p);
516extern void ipv6_push_frag_opts(struct sk_buff *skb,
517 struct ipv6_txoptions *opt,
518 u8 *proto);
519
520extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
0d3d077c 521 u8 *nexthdrp);
1da177e4
LT		 522
523extern int ipv6_ext_hdr(u8 nexthdr);
524
c61a4043
MN		 525extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
526
1da177e4
LT		 527extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
528 struct ipv6_rt_hdr *hdr);
529
530
531/*
532 * socket options (ipv6_sockglue.c)
533 */
534
535extern int ipv6_setsockopt(struct sock *sk, int level,
536 int optname,
537 char __user *optval,
538 int optlen);
539extern int ipv6_getsockopt(struct sock *sk, int level,
540 int optname,
541 char __user *optval,
542 int __user *optlen);
3fdadf7d
DM		 543extern int compat_ipv6_setsockopt(struct sock *sk,
544 int level,
545 int optname,
546 char __user *optval,
547 int optlen);
548extern int compat_ipv6_getsockopt(struct sock *sk,
549 int level,
550 int optname,
551 char __user *optval,
552 int __user *optlen);
1da177e4
LT		 553
554extern void ipv6_packet_init(void);
555
556extern void ipv6_packet_cleanup(void);
557
558extern int ip6_datagram_connect(struct sock *sk,
559 struct sockaddr *addr, int addr_len);
560
561extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
562extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
563 u32 info, u8 *payload);
564extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
565
566extern int inet6_release(struct socket *sock);
567extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
568 int addr_len);
569extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
570 int *uaddr_len, int peer);
571extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
572 unsigned long arg);
573
d8313f5c
ACM		 574extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
575 struct sock *sk);
576
1da177e4
LT		 577/*
578 * reassembly.c
579 */
580extern int sysctl_ip6frag_high_thresh;
581extern int sysctl_ip6frag_low_thresh;
582extern int sysctl_ip6frag_time;
583extern int sysctl_ip6frag_secret_interval;
584
90ddc4f0
ED		 585extern const struct proto_ops inet6_stream_ops;
586extern const struct proto_ops inet6_dgram_ops;
20380731 587
14c85021
ACM		 588struct group_source_req;
589struct group_filter;
590
20380731
ACM		 591extern int ip6_mc_source(int add, int omode, struct sock *sk,
592 struct group_source_req *pgsr);
593extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
594extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
595 struct group_filter __user *optval,
596 int __user *optlen);
597
598#ifdef CONFIG_PROC_FS
599extern int ac6_proc_init(void);
600extern void ac6_proc_exit(void);
601extern int raw6_proc_init(void);
602extern void raw6_proc_exit(void);
603extern int tcp6_proc_init(void);
604extern void tcp6_proc_exit(void);
605extern int udp6_proc_init(void);
606extern void udp6_proc_exit(void);
607extern int ipv6_misc_proc_init(void);
608extern void ipv6_misc_proc_exit(void);
609
610extern struct rt6_statistics rt6_stats;
611#endif
1da177e4 612
20380731
ACM		 613#ifdef CONFIG_SYSCTL
614extern ctl_table ipv6_route_table[];
615extern ctl_table ipv6_icmp_table[];
1da177e4 616
20380731
ACM		 617extern void ipv6_sysctl_register(void);
618extern void ipv6_sysctl_unregister(void);
619#endif
1da177e4 620
20380731
ACM		 621#endif /* __KERNEL__ */
622#endif /* _NET_IPV6_H */
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