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[IPV6]: Do not send RH0 anymore.
[linux-2.6/sactl.git] / include / net / ipv6.h
blob46b9dce82f6e3e60255d6bd1efdb413627e00363
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. */
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 #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
97 struct frag_hdr {
98 __u8 nexthdr;
99 __u8 reserved;
100 __be16 frag_off;
101 __be32 identification;
102 };
103
104 #define IP6_MF 0x0001
105
106 #ifdef __KERNEL__
107
108 #include <net/sock.h>
109
110 /* sysctls */
111 extern int sysctl_ipv6_bindv6only;
112 extern int sysctl_mld_max_msf;
113
114 /* MIBs */
115 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
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 })
134 DECLARE_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 })
160 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
161 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
162 #define UDP6_INC_STATS_BH(field, is_udplite) do { \
163 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
164 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
165 #define UDP6_INC_STATS_USER(field, is_udplite) do { \
166 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
167 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
168
169 struct ip6_ra_chain
170 {
171 struct ip6_ra_chain *next;
172 struct sock *sk;
173 int sel;
174 void (*destructor)(struct sock *);
175 };
176
177 extern struct ip6_ra_chain *ip6_ra_chain;
178 extern rwlock_t ip6_ra_lock;
179
180 /*
181 This structure is prepared by protocol, when parsing
182 ancillary data and passed to IPv6.
183 */
184
185 struct ipv6_txoptions
186 {
187 /* Length of this structure */
188 int tot_len;
189
190 /* length of extension headers */
191
192 __u16 opt_flen; /* after fragment hdr */
193 __u16 opt_nflen; /* before fragment hdr */
194
195 struct ipv6_opt_hdr *hopopt;
196 struct ipv6_opt_hdr *dst0opt;
197 struct ipv6_rt_hdr *srcrt; /* Routing Header */
198 struct ipv6_opt_hdr *dst1opt;
199
200 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
201 };
202
203 struct ip6_flowlabel
204 {
205 struct ip6_flowlabel *next;
206 __be32 label;
207 atomic_t users;
208 struct in6_addr dst;
209 struct ipv6_txoptions *opt;
210 unsigned long linger;
211 u8 share;
212 u32 owner;
213 unsigned long lastuse;
214 unsigned long expires;
215 };
216
217 #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
218 #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
219
220 struct ipv6_fl_socklist
221 {
222 struct ipv6_fl_socklist *next;
223 struct ip6_flowlabel *fl;
224 };
225
226 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
227 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
228 struct ip6_flowlabel * fl,
229 struct ipv6_txoptions * fopt);
230 extern void fl6_free_socklist(struct sock *sk);
231 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
232 extern void ip6_flowlabel_init(void);
233 extern void ip6_flowlabel_cleanup(void);
234
235 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
236 {
237 if (fl)
238 atomic_dec(&fl->users);
239 }
240
241 extern int ip6_ra_control(struct sock *sk, int sel,
242 void (*destructor)(struct sock *));
243
244
245 extern int ipv6_parse_hopopts(struct sk_buff **skbp);
246
247 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
248 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
249 int newtype,
250 struct ipv6_opt_hdr __user *newopt,
251 int newoptlen);
252 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
253 struct ipv6_txoptions *opt);
254
255 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
256
257 extern int ip6_frag_nqueues;
258 extern atomic_t ip6_frag_mem;
259
260 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
261
262 /*
263 * Function prototype for build_xmit
264 */
265
266 typedef int (*inet_getfrag_t) (const void *data,
267 struct in6_addr *addr,
268 char *,
269 unsigned int, unsigned int);
270
271 extern int __ipv6_addr_type(const struct in6_addr *addr);
272 static inline int ipv6_addr_type(const struct in6_addr *addr)
273 {
274 return __ipv6_addr_type(addr) & 0xffff;
275 }
276
277 static inline int ipv6_addr_scope(const struct in6_addr *addr)
278 {
279 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
280 }
281
282 static inline int __ipv6_addr_src_scope(int type)
283 {
284 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
285 }
286
287 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
288 {
289 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
290 }
291
292 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
293 {
294 return memcmp(a1, a2, sizeof(struct in6_addr));
295 }
296
297 static inline int
298 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
299 const struct in6_addr *a2)
300 {
301 unsigned int i;
302
303 for (i = 0; i < 4; i++)
304 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
305 return 1;
306 return 0;
307 }
308
309 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
310 {
311 memcpy(a1, a2, sizeof(struct in6_addr));
312 }
313
314 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
315 const struct in6_addr *addr,
316 int plen)
317 {
318 /* caller must guarantee 0 <= plen <= 128 */
319 int o = plen >> 3,
320 b = plen & 0x7;
321
322 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
323 memcpy(pfx->s6_addr, addr, o);
324 if (b != 0)
325 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
326 }
327
328 static inline void ipv6_addr_set(struct in6_addr *addr,
329 __be32 w1, __be32 w2,
330 __be32 w3, __be32 w4)
331 {
332 addr->s6_addr32[0] = w1;
333 addr->s6_addr32[1] = w2;
334 addr->s6_addr32[2] = w3;
335 addr->s6_addr32[3] = w4;
336 }
337
338 static inline int ipv6_addr_equal(const struct in6_addr *a1,
339 const struct in6_addr *a2)
340 {
341 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
342 a1->s6_addr32[1] == a2->s6_addr32[1] &&
343 a1->s6_addr32[2] == a2->s6_addr32[2] &&
344 a1->s6_addr32[3] == a2->s6_addr32[3]);
345 }
346
347 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
348 unsigned int prefixlen)
349 {
350 unsigned pdw, pbi;
351
352 /* check complete u32 in prefix */
353 pdw = prefixlen >> 5;
354 if (pdw && memcmp(a1, a2, pdw << 2))
355 return 0;
356
357 /* check incomplete u32 in prefix */
358 pbi = prefixlen & 0x1f;
359 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
360 return 0;
361
362 return 1;
363 }
364
365 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
366 const struct in6_addr *a2,
367 unsigned int prefixlen)
368 {
369 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
370 prefixlen);
371 }
372
373 static inline int ipv6_addr_any(const struct in6_addr *a)
374 {
375 return ((a->s6_addr32[0] | a->s6_addr32[1] |
376 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
377 }
378
379 /*
380 * find the first different bit between two addresses
381 * length of address must be a multiple of 32bits
382 */
383 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
384 {
385 const __be32 *a1 = token1, *a2 = token2;
386 int i;
387
388 addrlen >>= 2;
389
390 for (i = 0; i < addrlen; i++) {
391 __be32 xb = a1[i] ^ a2[i];
392 if (xb)
393 return i * 32 + 32 - fls(ntohl(xb));
394 }
395
396 /*
397 * we should *never* get to this point since that
398 * would mean the addrs are equal
399 *
400 * However, we do get to it 8) And exacly, when
401 * addresses are equal 8)
402 *
403 * ip route add 1111::/128 via ...
404 * ip route add 1111::/64 via ...
405 * and we are here.
406 *
407 * Ideally, this function should stop comparison
408 * at prefix length. It does not, but it is still OK,
409 * if returned value is greater than prefix length.
410 * --ANK (980803)
411 */
412 return (addrlen << 5);
413 }
414
415 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
416 {
417 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
418 }
419
420 /*
421 * Prototypes exported by ipv6
422 */
423
424 /*
425 * rcv function (called from netdevice level)
426 */
427
428 extern int ipv6_rcv(struct sk_buff *skb,
429 struct net_device *dev,
430 struct packet_type *pt,
431 struct net_device *orig_dev);
432
433 extern int ip6_rcv_finish(struct sk_buff *skb);
434
435 /*
436 * upper-layer output functions
437 */
438 extern int ip6_xmit(struct sock *sk,
439 struct sk_buff *skb,
440 struct flowi *fl,
441 struct ipv6_txoptions *opt,
442 int ipfragok);
443
444 extern int ip6_nd_hdr(struct sock *sk,
445 struct sk_buff *skb,
446 struct net_device *dev,
447 struct in6_addr *saddr,
448 struct in6_addr *daddr,
449 int proto, int len);
450
451 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
452
453 extern int ip6_append_data(struct sock *sk,
454 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
455 void *from,
456 int length,
457 int transhdrlen,
458 int hlimit,
459 int tclass,
460 struct ipv6_txoptions *opt,
461 struct flowi *fl,
462 struct rt6_info *rt,
463 unsigned int flags);
464
465 extern int ip6_push_pending_frames(struct sock *sk);
466
467 extern void ip6_flush_pending_frames(struct sock *sk);
468
469 extern int ip6_dst_lookup(struct sock *sk,
470 struct dst_entry **dst,
471 struct flowi *fl);
472 extern int ip6_dst_blackhole(struct sock *sk,
473 struct dst_entry **dst,
474 struct flowi *fl);
475 extern int ip6_sk_dst_lookup(struct sock *sk,
476 struct dst_entry **dst,
477 struct flowi *fl);
478
479 /*
480 * skb processing functions
481 */
482
483 extern int ip6_output(struct sk_buff *skb);
484 extern int ip6_forward(struct sk_buff *skb);
485 extern int ip6_input(struct sk_buff *skb);
486 extern int ip6_mc_input(struct sk_buff *skb);
487
488 /*
489 * Extension header (options) processing
490 */
491
492 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
493 u8 *prev_hdr,
494 struct ipv6_txoptions *opt,
495 struct in6_addr *daddr,
496 u32 jumbolen);
497 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
498 u8 *prev_hdr,
499 struct ipv6_txoptions *opt);
500 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
501 struct ipv6_txoptions *opt,
502 u8 *proto,
503 struct in6_addr **daddr_p);
504 extern void ipv6_push_frag_opts(struct sk_buff *skb,
505 struct ipv6_txoptions *opt,
506 u8 *proto);
507
508 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
509 u8 *nexthdrp);
510
511 extern int ipv6_ext_hdr(u8 nexthdr);
512
513 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
514
515 /*
516 * socket options (ipv6_sockglue.c)
517 */
518
519 extern int ipv6_setsockopt(struct sock *sk, int level,
520 int optname,
521 char __user *optval,
522 int optlen);
523 extern int ipv6_getsockopt(struct sock *sk, int level,
524 int optname,
525 char __user *optval,
526 int __user *optlen);
527 extern int compat_ipv6_setsockopt(struct sock *sk,
528 int level,
529 int optname,
530 char __user *optval,
531 int optlen);
532 extern int compat_ipv6_getsockopt(struct sock *sk,
533 int level,
534 int optname,
535 char __user *optval,
536 int __user *optlen);
537
538 extern void ipv6_packet_init(void);
539
540 extern void ipv6_packet_cleanup(void);
541
542 extern int ip6_datagram_connect(struct sock *sk,
543 struct sockaddr *addr, int addr_len);
544
545 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
546 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
547 u32 info, u8 *payload);
548 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
549
550 extern int inet6_release(struct socket *sock);
551 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
552 int addr_len);
553 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
554 int *uaddr_len, int peer);
555 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
556 unsigned long arg);
557
558 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
559 struct sock *sk);
560
561 /*
562 * reassembly.c
563 */
564 extern int sysctl_ip6frag_high_thresh;
565 extern int sysctl_ip6frag_low_thresh;
566 extern int sysctl_ip6frag_time;
567 extern int sysctl_ip6frag_secret_interval;
568
569 extern const struct proto_ops inet6_stream_ops;
570 extern const struct proto_ops inet6_dgram_ops;
571
572 struct group_source_req;
573 struct group_filter;
574
575 extern int ip6_mc_source(int add, int omode, struct sock *sk,
576 struct group_source_req *pgsr);
577 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
578 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
579 struct group_filter __user *optval,
580 int __user *optlen);
581
582 #ifdef CONFIG_PROC_FS
583 extern int ac6_proc_init(void);
584 extern void ac6_proc_exit(void);
585 extern int raw6_proc_init(void);
586 extern void raw6_proc_exit(void);
587 extern int tcp6_proc_init(void);
588 extern void tcp6_proc_exit(void);
589 extern int udp6_proc_init(void);
590 extern void udp6_proc_exit(void);
591 extern int udplite6_proc_init(void);
592 extern void udplite6_proc_exit(void);
593 extern int ipv6_misc_proc_init(void);
594 extern void ipv6_misc_proc_exit(void);
595 extern int snmp6_register_dev(struct inet6_dev *idev);
596 extern int snmp6_unregister_dev(struct inet6_dev *idev);
597
598 extern struct rt6_statistics rt6_stats;
599 #else
600 static inline int snmp6_register_dev(struct inet6_dev *idev)
601 {
602 return 0;
603 }
604
605 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
606 {
607 return 0;
608 }
609 #endif
610
611 #ifdef CONFIG_SYSCTL
612 extern ctl_table ipv6_route_table[];
613 extern ctl_table ipv6_icmp_table[];
614
615 extern void ipv6_sysctl_register(void);
616 extern void ipv6_sysctl_unregister(void);
617 #endif
618
619 #endif /* __KERNEL__ */
620 #endif /* _NET_IPV6_H */
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