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_ipv6_bindv6only;
113extern int sysctl_mld_max_msf;
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 ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
147 struct inet6_dev *_idev = idev; \
148 __typeof__(offset) _offset = (offset); \
149 if (likely(_idev != NULL)) \
150 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
151 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
152})
153
154#define ICMP6MSGOUT_INC_STATS(idev, field) \
155 _DEVINC(icmpv6msg, , idev, field +256)
156#define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
157 _DEVINC(icmpv6msg, _BH, idev, field +256)
158#define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
159 _DEVINC(icmpv6msg, _USER, idev, field +256)
160#define ICMP6MSGIN_INC_STATS(idev, field) \
161 _DEVINC(icmpv6msg, , idev, field)
162#define ICMP6MSGIN_INC_STATS_BH(idev, field) \
163 _DEVINC(icmpv6msg, _BH, idev, field)
164#define ICMP6MSGIN_INC_STATS_USER(idev, field) \
165 _DEVINC(icmpv6msg, _USER, idev, field)
166
167DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
168DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
169#define UDP6_INC_STATS_BH(field, is_udplite) do { \
170 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
171 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
172#define UDP6_INC_STATS_USER(field, is_udplite) do { \
173 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
174 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
175
176struct ip6_ra_chain
177{
178 struct ip6_ra_chain *next;
179 struct sock *sk;
180 int sel;
181 void (*destructor)(struct sock *);
182};
183
184extern struct ip6_ra_chain *ip6_ra_chain;
185extern rwlock_t ip6_ra_lock;
186
187/*
188 This structure is prepared by protocol, when parsing
189 ancillary data and passed to IPv6.
190 */
191
192struct ipv6_txoptions
193{
194 /* Length of this structure */
195 int tot_len;
196
197 /* length of extension headers */
198
199 __u16 opt_flen; /* after fragment hdr */
200 __u16 opt_nflen; /* before fragment hdr */
201
202 struct ipv6_opt_hdr *hopopt;
203 struct ipv6_opt_hdr *dst0opt;
204 struct ipv6_rt_hdr *srcrt; /* Routing Header */
205 struct ipv6_opt_hdr *dst1opt;
206
207 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
208};
209
210struct ip6_flowlabel
211{
212 struct ip6_flowlabel *next;
213 __be32 label;
214 atomic_t users;
215 struct in6_addr dst;
216 struct ipv6_txoptions *opt;
217 unsigned long linger;
218 u8 share;
219 u32 owner;
220 unsigned long lastuse;
221 unsigned long expires;
222};
223
224#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
225#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
226
227struct ipv6_fl_socklist
228{
229 struct ipv6_fl_socklist *next;
230 struct ip6_flowlabel *fl;
231};
232
233extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
234extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
235 struct ip6_flowlabel * fl,
236 struct ipv6_txoptions * fopt);
237extern void fl6_free_socklist(struct sock *sk);
238extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
239extern void ip6_flowlabel_init(void);
240extern void ip6_flowlabel_cleanup(void);
241
242static inline void fl6_sock_release(struct ip6_flowlabel *fl)
243{
244 if (fl)
245 atomic_dec(&fl->users);
246}
247
248extern int ip6_ra_control(struct sock *sk, int sel,
249 void (*destructor)(struct sock *));
250
251
252extern int ipv6_parse_hopopts(struct sk_buff *skb);
253
254extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
255extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
256 int newtype,
257 struct ipv6_opt_hdr __user *newopt,
258 int newoptlen);
259struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
260 struct ipv6_txoptions *opt);
261
262extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
263
264int ip6_frag_nqueues(void);
265int ip6_frag_mem(void);
266
267#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
268
269/*
270 * Function prototype for build_xmit
271 */
272
273typedef int (*inet_getfrag_t) (const void *data,
274 struct in6_addr *addr,
275 char *,
276 unsigned int, unsigned int);
277
278extern int __ipv6_addr_type(const struct in6_addr *addr);
279static inline int ipv6_addr_type(const struct in6_addr *addr)
280{
281 return __ipv6_addr_type(addr) & 0xffff;
282}
283
284static inline int ipv6_addr_scope(const struct in6_addr *addr)
285{
286 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
287}
288
289static inline int __ipv6_addr_src_scope(int type)
290{
291 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
292}
293
294static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
295{
296 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
297}
298
299static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
300{
301 return memcmp(a1, a2, sizeof(struct in6_addr));
302}
303
304static inline int
305ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
306 const struct in6_addr *a2)
307{
308 unsigned int i;
309
310 for (i = 0; i < 4; i++)
311 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
312 return 1;
313 return 0;
314}
315
316static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
317{
318 memcpy(a1, a2, sizeof(struct in6_addr));
319}
320
321static inline void ipv6_addr_prefix(struct in6_addr *pfx,
322 const struct in6_addr *addr,
323 int plen)
324{
325 /* caller must guarantee 0 <= plen <= 128 */
326 int o = plen >> 3,
327 b = plen & 0x7;
328
329 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
330 memcpy(pfx->s6_addr, addr, o);
331 if (b != 0)
332 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
333}
334
335static inline void ipv6_addr_set(struct in6_addr *addr,
336 __be32 w1, __be32 w2,
337 __be32 w3, __be32 w4)
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
345static inline int ipv6_addr_equal(const struct in6_addr *a1,
346 const struct in6_addr *a2)
347{
348 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
349 a1->s6_addr32[1] == a2->s6_addr32[1] &&
350 a1->s6_addr32[2] == a2->s6_addr32[2] &&
351 a1->s6_addr32[3] == a2->s6_addr32[3]);
352}
353
354static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
355 unsigned int prefixlen)
356{
357 unsigned pdw, pbi;
358
359 /* check complete u32 in prefix */
360 pdw = prefixlen >> 5;
361 if (pdw && memcmp(a1, a2, pdw << 2))
362 return 0;
363
364 /* check incomplete u32 in prefix */
365 pbi = prefixlen & 0x1f;
366 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
367 return 0;
368
369 return 1;
370}
371
372static inline int ipv6_prefix_equal(const struct in6_addr *a1,
373 const struct in6_addr *a2,
374 unsigned int prefixlen)
375{
376 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
377 prefixlen);
378}
379
380struct inet_frag_queue;
381
382struct ip6_create_arg {
383 __be32 id;
384 struct in6_addr *src;
385 struct in6_addr *dst;
386};
387
388void ip6_frag_init(struct inet_frag_queue *q, void *a);
389int ip6_frag_match(struct inet_frag_queue *q, void *a);
390
391static inline int ipv6_addr_any(const struct in6_addr *a)
392{
393 return ((a->s6_addr32[0] | a->s6_addr32[1] |
394 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
395}
396
397static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
398{
399 return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
400 a->s6_addr32[2] == htonl(0x0000ffff));
401}
402
403/*
404 * find the first different bit between two addresses
405 * length of address must be a multiple of 32bits
406 */
407static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
408{
409 const __be32 *a1 = token1, *a2 = token2;
410 int i;
411
412 addrlen >>= 2;
413
414 for (i = 0; i < addrlen; i++) {
415 __be32 xb = a1[i] ^ a2[i];
416 if (xb)
417 return i * 32 + 32 - fls(ntohl(xb));
418 }
419
420 /*
421 * we should *never* get to this point since that
422 * would mean the addrs are equal
423 *
424 * However, we do get to it 8) And exacly, when
425 * addresses are equal 8)
426 *
427 * ip route add 1111::/128 via ...
428 * ip route add 1111::/64 via ...
429 * and we are here.
430 *
431 * Ideally, this function should stop comparison
432 * at prefix length. It does not, but it is still OK,
433 * if returned value is greater than prefix length.
434 * --ANK (980803)
435 */
436 return (addrlen << 5);
437}
438
439static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
440{
441 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
442}
443
444/*
445 * Prototypes exported by ipv6
446 */
447
448/*
449 * rcv function (called from netdevice level)
450 */
451
452extern int ipv6_rcv(struct sk_buff *skb,
453 struct net_device *dev,
454 struct packet_type *pt,
455 struct net_device *orig_dev);
456
457extern int ip6_rcv_finish(struct sk_buff *skb);
458
459/*
460 * upper-layer output functions
461 */
462extern int ip6_xmit(struct sock *sk,
463 struct sk_buff *skb,
464 struct flowi *fl,
465 struct ipv6_txoptions *opt,
466 int ipfragok);
467
468extern int ip6_nd_hdr(struct sock *sk,
469 struct sk_buff *skb,
470 struct net_device *dev,
471 struct in6_addr *saddr,
472 struct in6_addr *daddr,
473 int proto, int len);
474
475extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
476
477extern int ip6_append_data(struct sock *sk,
478 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
479 void *from,
480 int length,
481 int transhdrlen,
482 int hlimit,
483 int tclass,
484 struct ipv6_txoptions *opt,
485 struct flowi *fl,
486 struct rt6_info *rt,
487 unsigned int flags);
488
489extern int ip6_push_pending_frames(struct sock *sk);
490
491extern void ip6_flush_pending_frames(struct sock *sk);
492
493extern int ip6_dst_lookup(struct sock *sk,
494 struct dst_entry **dst,
495 struct flowi *fl);
496extern int ip6_dst_blackhole(struct sock *sk,
497 struct dst_entry **dst,
498 struct flowi *fl);
499extern int ip6_sk_dst_lookup(struct sock *sk,
500 struct dst_entry **dst,
501 struct flowi *fl);
502
503/*
504 * skb processing functions
505 */
506
507extern int ip6_output(struct sk_buff *skb);
508extern int ip6_forward(struct sk_buff *skb);
509extern int ip6_input(struct sk_buff *skb);
510extern int ip6_mc_input(struct sk_buff *skb);
511
512/*
513 * Extension header (options) processing
514 */
515
516extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
517 u8 *prev_hdr,
518 struct ipv6_txoptions *opt,
519 struct in6_addr *daddr,
520 u32 jumbolen);
521extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
522 u8 *prev_hdr,
523 struct ipv6_txoptions *opt);
524extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
525 struct ipv6_txoptions *opt,
526 u8 *proto,
527 struct in6_addr **daddr_p);
528extern void ipv6_push_frag_opts(struct sk_buff *skb,
529 struct ipv6_txoptions *opt,
530 u8 *proto);
531
532extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
533 u8 *nexthdrp);
534
535extern int ipv6_ext_hdr(u8 nexthdr);
536
537extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
538
539/*
540 * socket options (ipv6_sockglue.c)
541 */
542
543extern int ipv6_setsockopt(struct sock *sk, int level,
544 int optname,
545 char __user *optval,
546 int optlen);
547extern int ipv6_getsockopt(struct sock *sk, int level,
548 int optname,
549 char __user *optval,
550 int __user *optlen);
551extern int compat_ipv6_setsockopt(struct sock *sk,
552 int level,
553 int optname,
554 char __user *optval,
555 int optlen);
556extern int compat_ipv6_getsockopt(struct sock *sk,
557 int level,
558 int optname,
559 char __user *optval,
560 int __user *optlen);
561
562extern void ipv6_packet_init(void);
563
564extern void ipv6_packet_cleanup(void);
565
566extern int ip6_datagram_connect(struct sock *sk,
567 struct sockaddr *addr, int addr_len);
568
569extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
570extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
571 u32 info, u8 *payload);
572extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
573
574extern int inet6_release(struct socket *sock);
575extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
576 int addr_len);
577extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
578 int *uaddr_len, int peer);
579extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
580 unsigned long arg);
581
582extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
583 struct sock *sk);
584
585/*
586 * reassembly.c
587 */
588struct inet_frags_ctl;
589extern struct inet_frags_ctl ip6_frags_ctl;
590
591extern const struct proto_ops inet6_stream_ops;
592extern const struct proto_ops inet6_dgram_ops;
593
594struct group_source_req;
595struct group_filter;
596
597extern int ip6_mc_source(int add, int omode, struct sock *sk,
598 struct group_source_req *pgsr);
599extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
600extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
601 struct group_filter __user *optval,
602 int __user *optlen);
603
604#ifdef CONFIG_PROC_FS
605extern int ac6_proc_init(void);
606extern void ac6_proc_exit(void);
607extern int raw6_proc_init(void);
608extern void raw6_proc_exit(void);
609extern int tcp6_proc_init(void);
610extern void tcp6_proc_exit(void);
611extern int udp6_proc_init(void);
612extern void udp6_proc_exit(void);
613extern int udplite6_proc_init(void);
614extern void udplite6_proc_exit(void);
615extern int ipv6_misc_proc_init(void);
616extern void ipv6_misc_proc_exit(void);
617extern int snmp6_register_dev(struct inet6_dev *idev);
618extern int snmp6_unregister_dev(struct inet6_dev *idev);
619
620extern struct rt6_statistics rt6_stats;
621#else
622static inline int snmp6_register_dev(struct inet6_dev *idev)
623{
624 return 0;
625}
626
627static inline int snmp6_unregister_dev(struct inet6_dev *idev)
628{
629 return 0;
630}
631#endif
632
633#ifdef CONFIG_SYSCTL
634extern ctl_table ipv6_route_table[];
635extern ctl_table ipv6_icmp_table[];
636
637extern void ipv6_sysctl_register(void);
638extern void ipv6_sysctl_unregister(void);
639#endif
640
641#endif /* __KERNEL__ */
642#endif /* _NET_IPV6_H */