tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/if_inet6.h>
21#include <net/ndisc.h>
22#include <net/flow.h>
23#include <net/snmp.h>
24
25#define SIN6_LEN_RFC2133 24
26
27#define IPV6_MAXPLEN 65535
28
29/*
30 * NextHeader field of IPv6 header
31 */
32
33#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
34#define NEXTHDR_TCP 6 /* TCP segment. */
35#define NEXTHDR_UDP 17 /* UDP message. */
36#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37#define NEXTHDR_ROUTING 43 /* Routing header. */
38#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
40#define NEXTHDR_AUTH 51 /* Authentication header. */
41#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
42#define NEXTHDR_NONE 59 /* No next header */
43#define NEXTHDR_DEST 60 /* Destination options header. */
44#define NEXTHDR_MOBILITY 135 /* Mobility header. */
45
46#define NEXTHDR_MAX 255
47
48
49
50#define IPV6_DEFAULT_HOPLIMIT 64
51#define IPV6_DEFAULT_MCASTHOPS 1
52
53/*
54 * Addr type
55 *
56 * type - unicast | multicast
57 * scope - local | site | global
58 * v4 - compat
59 * v4mapped
60 * any
61 * loopback
62 */
63
64#define IPV6_ADDR_ANY 0x0000U
65
66#define IPV6_ADDR_UNICAST 0x0001U
67#define IPV6_ADDR_MULTICAST 0x0002U
68
69#define IPV6_ADDR_LOOPBACK 0x0010U
70#define IPV6_ADDR_LINKLOCAL 0x0020U
71#define IPV6_ADDR_SITELOCAL 0x0040U
72
73#define IPV6_ADDR_COMPATv4 0x0080U
74
75#define IPV6_ADDR_SCOPE_MASK 0x00f0U
76
77#define IPV6_ADDR_MAPPED 0x1000U
78#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
79
80/*
81 * Addr scopes
82 */
83#ifdef __KERNEL__
84#define IPV6_ADDR_MC_SCOPE(a) \
85 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
86#define __IPV6_ADDR_SCOPE_INVALID -1
87#endif
88#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
89#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
90#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
91#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
92#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
93
94/*
95 * fragmentation header
96 */
97
98struct frag_hdr {
99 __u8 nexthdr;
100 __u8 reserved;
101 __be16 frag_off;
102 __be32 identification;
103};
104
105#define IP6_MF 0x0001
106
107#ifdef __KERNEL__
108
109#include <net/sock.h>
110
111/* sysctls */
112extern int sysctl_mld_max_msf;
113extern struct ctl_path net_ipv6_ctl_path[];
114
115#define _DEVINC(statname, modifier, idev, field) \
116({ \
117 struct inet6_dev *_idev = (idev); \
118 if (likely(_idev != NULL)) \
119 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
120 SNMP_INC_STATS##modifier(statname##_statistics, (field)); \
121})
122
123#define _DEVADD(statname, modifier, idev, field, val) \
124({ \
125 struct inet6_dev *_idev = (idev); \
126 if (likely(_idev != NULL)) \
127 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
128 SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
129})
130
131/* MIBs */
132DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
133
134#define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
135#define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
136#define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field)
137#define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
138
139DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
140DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
141
142#define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
143#define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
144#define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
145
146#define ICMP6MSGOUT_INC_STATS(idev, field) \
147 _DEVINC(icmpv6msg, , idev, field +256)
148#define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
149 _DEVINC(icmpv6msg, _BH, idev, field +256)
150#define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
151 _DEVINC(icmpv6msg, _USER, idev, field +256)
152#define ICMP6MSGIN_INC_STATS(idev, field) \
153 _DEVINC(icmpv6msg, , idev, field)
154#define ICMP6MSGIN_INC_STATS_BH(idev, field) \
155 _DEVINC(icmpv6msg, _BH, idev, field)
156#define ICMP6MSGIN_INC_STATS_USER(idev, field) \
157 _DEVINC(icmpv6msg, _USER, idev, field)
158
159struct ip6_ra_chain
160{
161 struct ip6_ra_chain *next;
162 struct sock *sk;
163 int sel;
164 void (*destructor)(struct sock *);
165};
166
167extern struct ip6_ra_chain *ip6_ra_chain;
168extern rwlock_t ip6_ra_lock;
169
170/*
171 This structure is prepared by protocol, when parsing
172 ancillary data and passed to IPv6.
173 */
174
175struct ipv6_txoptions
176{
177 /* Length of this structure */
178 int tot_len;
179
180 /* length of extension headers */
181
182 __u16 opt_flen; /* after fragment hdr */
183 __u16 opt_nflen; /* before fragment hdr */
184
185 struct ipv6_opt_hdr *hopopt;
186 struct ipv6_opt_hdr *dst0opt;
187 struct ipv6_rt_hdr *srcrt; /* Routing Header */
188 struct ipv6_opt_hdr *dst1opt;
189
190 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
191};
192
193struct ip6_flowlabel
194{
195 struct ip6_flowlabel *next;
196 __be32 label;
197 atomic_t users;
198 struct in6_addr dst;
199 struct ipv6_txoptions *opt;
200 unsigned long linger;
201 u8 share;
202 u32 owner;
203 unsigned long lastuse;
204 unsigned long expires;
205};
206
207#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
208#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
209
210struct ipv6_fl_socklist
211{
212 struct ipv6_fl_socklist *next;
213 struct ip6_flowlabel *fl;
214};
215
216extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
217extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
218 struct ip6_flowlabel * fl,
219 struct ipv6_txoptions * fopt);
220extern void fl6_free_socklist(struct sock *sk);
221extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
222extern int ip6_flowlabel_init(void);
223extern void ip6_flowlabel_cleanup(void);
224
225static inline void fl6_sock_release(struct ip6_flowlabel *fl)
226{
227 if (fl)
228 atomic_dec(&fl->users);
229}
230
231extern int ip6_ra_control(struct sock *sk, int sel,
232 void (*destructor)(struct sock *));
233
234
235extern int ipv6_parse_hopopts(struct sk_buff *skb);
236
237extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
238extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
239 int newtype,
240 struct ipv6_opt_hdr __user *newopt,
241 int newoptlen);
242struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
243 struct ipv6_txoptions *opt);
244
245extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
246
247int ip6_frag_nqueues(struct net *net);
248int ip6_frag_mem(struct net *net);
249
250#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
251
252/*
253 * Function prototype for build_xmit
254 */
255
256typedef int (*inet_getfrag_t) (const void *data,
257 struct in6_addr *addr,
258 char *,
259 unsigned int, unsigned int);
260
261extern int __ipv6_addr_type(const struct in6_addr *addr);
262static inline int ipv6_addr_type(const struct in6_addr *addr)
263{
264 return __ipv6_addr_type(addr) & 0xffff;
265}
266
267static inline int ipv6_addr_scope(const struct in6_addr *addr)
268{
269 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
270}
271
272static inline int __ipv6_addr_src_scope(int type)
273{
274 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
275}
276
277static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
278{
279 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
280}
281
282static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
283{
284 return memcmp(a1, a2, sizeof(struct in6_addr));
285}
286
287static inline int
288ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
289 const struct in6_addr *a2)
290{
291 unsigned int i;
292
293 for (i = 0; i < 4; i++)
294 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
295 return 1;
296 return 0;
297}
298
299static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
300{
301 memcpy(a1, a2, sizeof(struct in6_addr));
302}
303
304static inline void ipv6_addr_prefix(struct in6_addr *pfx,
305 const struct in6_addr *addr,
306 int plen)
307{
308 /* caller must guarantee 0 <= plen <= 128 */
309 int o = plen >> 3,
310 b = plen & 0x7;
311
312 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
313 memcpy(pfx->s6_addr, addr, o);
314 if (b != 0)
315 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
316}
317
318static inline void ipv6_addr_set(struct in6_addr *addr,
319 __be32 w1, __be32 w2,
320 __be32 w3, __be32 w4)
321{
322 addr->s6_addr32[0] = w1;
323 addr->s6_addr32[1] = w2;
324 addr->s6_addr32[2] = w3;
325 addr->s6_addr32[3] = w4;
326}
327
328static inline int ipv6_addr_equal(const struct in6_addr *a1,
329 const struct in6_addr *a2)
330{
331 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
332 a1->s6_addr32[1] == a2->s6_addr32[1] &&
333 a1->s6_addr32[2] == a2->s6_addr32[2] &&
334 a1->s6_addr32[3] == a2->s6_addr32[3]);
335}
336
337static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
338 unsigned int prefixlen)
339{
340 unsigned pdw, pbi;
341
342 /* check complete u32 in prefix */
343 pdw = prefixlen >> 5;
344 if (pdw && memcmp(a1, a2, pdw << 2))
345 return 0;
346
347 /* check incomplete u32 in prefix */
348 pbi = prefixlen & 0x1f;
349 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
350 return 0;
351
352 return 1;
353}
354
355static inline int ipv6_prefix_equal(const struct in6_addr *a1,
356 const struct in6_addr *a2,
357 unsigned int prefixlen)
358{
359 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
360 prefixlen);
361}
362
363struct inet_frag_queue;
364
365struct ip6_create_arg {
366 __be32 id;
367 struct in6_addr *src;
368 struct in6_addr *dst;
369};
370
371void ip6_frag_init(struct inet_frag_queue *q, void *a);
372int ip6_frag_match(struct inet_frag_queue *q, void *a);
373
374static inline int ipv6_addr_any(const struct in6_addr *a)
375{
376 return ((a->s6_addr32[0] | a->s6_addr32[1] |
377 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
378}
379
380static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
381{
382 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
383 a->s6_addr32[2] == htonl(0x0000ffff));
384}
385
386/*
387 * find the first different bit between two addresses
388 * length of address must be a multiple of 32bits
389 */
390static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
391{
392 const __be32 *a1 = token1, *a2 = token2;
393 int i;
394
395 addrlen >>= 2;
396
397 for (i = 0; i < addrlen; i++) {
398 __be32 xb = a1[i] ^ a2[i];
399 if (xb)
400 return i * 32 + 32 - fls(ntohl(xb));
401 }
402
403 /*
404 * we should *never* get to this point since that
405 * would mean the addrs are equal
406 *
407 * However, we do get to it 8) And exacly, when
408 * addresses are equal 8)
409 *
410 * ip route add 1111::/128 via ...
411 * ip route add 1111::/64 via ...
412 * and we are here.
413 *
414 * Ideally, this function should stop comparison
415 * at prefix length. It does not, but it is still OK,
416 * if returned value is greater than prefix length.
417 * --ANK (980803)
418 */
419 return (addrlen << 5);
420}
421
422static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
423{
424 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
425}
426
427/*
428 * Prototypes exported by ipv6
429 */
430
431/*
432 * rcv function (called from netdevice level)
433 */
434
435extern int ipv6_rcv(struct sk_buff *skb,
436 struct net_device *dev,
437 struct packet_type *pt,
438 struct net_device *orig_dev);
439
440extern int ip6_rcv_finish(struct sk_buff *skb);
441
442/*
443 * upper-layer output functions
444 */
445extern int ip6_xmit(struct sock *sk,
446 struct sk_buff *skb,
447 struct flowi *fl,
448 struct ipv6_txoptions *opt,
449 int ipfragok);
450
451extern int ip6_nd_hdr(struct sock *sk,
452 struct sk_buff *skb,
453 struct net_device *dev,
454 struct in6_addr *saddr,
455 struct in6_addr *daddr,
456 int proto, int len);
457
458extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
459
460extern int ip6_append_data(struct sock *sk,
461 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
462 void *from,
463 int length,
464 int transhdrlen,
465 int hlimit,
466 int tclass,
467 struct ipv6_txoptions *opt,
468 struct flowi *fl,
469 struct rt6_info *rt,
470 unsigned int flags);
471
472extern int ip6_push_pending_frames(struct sock *sk);
473
474extern void ip6_flush_pending_frames(struct sock *sk);
475
476extern int ip6_dst_lookup(struct sock *sk,
477 struct dst_entry **dst,
478 struct flowi *fl);
479extern int ip6_dst_blackhole(struct sock *sk,
480 struct dst_entry **dst,
481 struct flowi *fl);
482extern int ip6_sk_dst_lookup(struct sock *sk,
483 struct dst_entry **dst,
484 struct flowi *fl);
485
486/*
487 * skb processing functions
488 */
489
490extern int ip6_output(struct sk_buff *skb);
491extern int ip6_forward(struct sk_buff *skb);
492extern int ip6_input(struct sk_buff *skb);
493extern int ip6_mc_input(struct sk_buff *skb);
494
495extern int __ip6_local_out(struct sk_buff *skb);
496extern int ip6_local_out(struct sk_buff *skb);
497
498/*
499 * Extension header (options) processing
500 */
501
502extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
503 u8 *prev_hdr,
504 struct ipv6_txoptions *opt,
505 struct in6_addr *daddr,
506 u32 jumbolen);
507extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
508 u8 *prev_hdr,
509 struct ipv6_txoptions *opt);
510extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
511 struct ipv6_txoptions *opt,
512 u8 *proto,
513 struct in6_addr **daddr_p);
514extern void ipv6_push_frag_opts(struct sk_buff *skb,
515 struct ipv6_txoptions *opt,
516 u8 *proto);
517
518extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
519 u8 *nexthdrp);
520
521extern int ipv6_ext_hdr(u8 nexthdr);
522
523extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
524
525/*
526 * socket options (ipv6_sockglue.c)
527 */
528
529extern int ipv6_setsockopt(struct sock *sk, int level,
530 int optname,
531 char __user *optval,
532 int optlen);
533extern int ipv6_getsockopt(struct sock *sk, int level,
534 int optname,
535 char __user *optval,
536 int __user *optlen);
537extern int compat_ipv6_setsockopt(struct sock *sk,
538 int level,
539 int optname,
540 char __user *optval,
541 int optlen);
542extern int compat_ipv6_getsockopt(struct sock *sk,
543 int level,
544 int optname,
545 char __user *optval,
546 int __user *optlen);
547
548extern int ipv6_packet_init(void);
549
550extern void ipv6_packet_cleanup(void);
551
552extern int ip6_datagram_connect(struct sock *sk,
553 struct sockaddr *addr, int addr_len);
554
555extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
556extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
557 u32 info, u8 *payload);
558extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
559
560extern int inet6_release(struct socket *sock);
561extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
562 int addr_len);
563extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
564 int *uaddr_len, int peer);
565extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
566 unsigned long arg);
567
568extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
569 struct sock *sk);
570
571/*
572 * reassembly.c
573 */
574extern const struct proto_ops inet6_stream_ops;
575extern const struct proto_ops inet6_dgram_ops;
576
577struct group_source_req;
578struct group_filter;
579
580extern int ip6_mc_source(int add, int omode, struct sock *sk,
581 struct group_source_req *pgsr);
582extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
583extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
584 struct group_filter __user *optval,
585 int __user *optlen);
586
587#ifdef CONFIG_PROC_FS
588extern int ac6_proc_init(void);
589extern void ac6_proc_exit(void);
590extern int raw6_proc_init(void);
591extern void raw6_proc_exit(void);
592extern int tcp6_proc_init(void);
593extern void tcp6_proc_exit(void);
594extern int udp6_proc_init(void);
595extern void udp6_proc_exit(void);
596extern int udplite6_proc_init(void);
597extern void udplite6_proc_exit(void);
598extern int ipv6_misc_proc_init(void);
599extern void ipv6_misc_proc_exit(void);
600extern int snmp6_register_dev(struct inet6_dev *idev);
601extern int snmp6_unregister_dev(struct inet6_dev *idev);
602
603extern struct rt6_statistics rt6_stats;
604#else
605static inline int snmp6_register_dev(struct inet6_dev *idev)
606{
607 return 0;
608}
609
610static inline int snmp6_unregister_dev(struct inet6_dev *idev)
611{
612 return 0;
613}
614#endif
615
616#ifdef CONFIG_SYSCTL
617extern ctl_table ipv6_route_table_template[];
618extern ctl_table ipv6_icmp_table_template[];
619
620extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
621extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
622extern int ipv6_sysctl_register(void);
623extern void ipv6_sysctl_unregister(void);
624#endif
625
626#endif /* __KERNEL__ */
627#endif /* _NET_IPV6_H */