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 * 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_ESP 50 /* Encapsulating security payload. */
38#define NEXTHDR_AUTH 51 /* Authentication header. */
39#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40#define NEXTHDR_NONE 59 /* No next header */
41#define NEXTHDR_DEST 60 /* Destination options header. */
42#define NEXTHDR_MOBILITY 135 /* Mobility header. */
43
44#define NEXTHDR_MAX 255
45
46
47
48#define IPV6_DEFAULT_HOPLIMIT 64
49#define IPV6_DEFAULT_MCASTHOPS 1
50
51/*
52 * Addr type
53 *
54 * type - unicast | multicast
55 * scope - local | site | global
56 * v4 - compat
57 * v4mapped
58 * any
59 * loopback
60 */
61
62#define IPV6_ADDR_ANY 0x0000U
63
64#define IPV6_ADDR_UNICAST 0x0001U
65#define IPV6_ADDR_MULTICAST 0x0002U
66
67#define IPV6_ADDR_LOOPBACK 0x0010U
68#define IPV6_ADDR_LINKLOCAL 0x0020U
69#define IPV6_ADDR_SITELOCAL 0x0040U
70
71#define IPV6_ADDR_COMPATv4 0x0080U
72
73#define IPV6_ADDR_SCOPE_MASK 0x00f0U
74
75#define IPV6_ADDR_MAPPED 0x1000U
76#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
77
78/*
79 * Addr scopes
80 */
81#ifdef __KERNEL__
82#define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84#define __IPV6_ADDR_SCOPE_INVALID -1
85#endif
86#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
91
92/*
93 * fragmentation header
94 */
95
96struct frag_hdr {
97 __u8 nexthdr;
98 __u8 reserved;
99 __be16 frag_off;
100 __be32 identification;
101};
102
103#define IP6_MF 0x0001
104
105#ifdef __KERNEL__
106
107#include <net/sock.h>
108
109/* sysctls */
110extern int sysctl_mld_max_msf;
111extern struct ctl_path net_ipv6_ctl_path[];
112
113#define _DEVINC(net, statname, modifier, idev, field) \
114({ \
115 struct inet6_dev *_idev = (idev); \
116 if (likely(_idev != NULL)) \
117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
118 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
119})
120
121#define _DEVADD(net, statname, modifier, idev, field, val) \
122({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
126 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
127})
128
129/* MIBs */
130
131#define IP6_INC_STATS(net, idev,field) \
132 _DEVINC(net, ipv6, , idev, field)
133#define IP6_INC_STATS_BH(net, idev,field) \
134 _DEVINC(net, ipv6, _BH, idev, field)
135#define IP6_ADD_STATS_BH(net, idev,field,val) \
136 _DEVADD(net, ipv6, _BH, idev, field, val)
137
138#define ICMP6_INC_STATS(net, idev, field) \
139 _DEVINC(net, icmpv6, , idev, field)
140#define ICMP6_INC_STATS_BH(net, idev, field) \
141 _DEVINC(net, icmpv6, _BH, idev, field)
142
143#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
144 _DEVINC(net, icmpv6msg, , idev, field +256)
145#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
146 _DEVINC(net, icmpv6msg, _BH, idev, field +256)
147#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
148 _DEVINC(net, icmpv6msg, _BH, idev, field)
149
150struct ip6_ra_chain
151{
152 struct ip6_ra_chain *next;
153 struct sock *sk;
154 int sel;
155 void (*destructor)(struct sock *);
156};
157
158extern struct ip6_ra_chain *ip6_ra_chain;
159extern rwlock_t ip6_ra_lock;
160
161/*
162 This structure is prepared by protocol, when parsing
163 ancillary data and passed to IPv6.
164 */
165
166struct ipv6_txoptions
167{
168 /* Length of this structure */
169 int tot_len;
170
171 /* length of extension headers */
172
173 __u16 opt_flen; /* after fragment hdr */
174 __u16 opt_nflen; /* before fragment hdr */
175
176 struct ipv6_opt_hdr *hopopt;
177 struct ipv6_opt_hdr *dst0opt;
178 struct ipv6_rt_hdr *srcrt; /* Routing Header */
179 struct ipv6_opt_hdr *dst1opt;
180
181 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
182};
183
184struct ip6_flowlabel
185{
186 struct ip6_flowlabel *next;
187 __be32 label;
188 atomic_t users;
189 struct in6_addr dst;
190 struct ipv6_txoptions *opt;
191 unsigned long linger;
192 u8 share;
193 u32 owner;
194 unsigned long lastuse;
195 unsigned long expires;
196 struct net *fl_net;
197};
198
199#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
200#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
201
202struct ipv6_fl_socklist
203{
204 struct ipv6_fl_socklist *next;
205 struct ip6_flowlabel *fl;
206};
207
208extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
209extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
210 struct ip6_flowlabel * fl,
211 struct ipv6_txoptions * fopt);
212extern void fl6_free_socklist(struct sock *sk);
213extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
214extern int ip6_flowlabel_init(void);
215extern void ip6_flowlabel_cleanup(void);
216
217static inline void fl6_sock_release(struct ip6_flowlabel *fl)
218{
219 if (fl)
220 atomic_dec(&fl->users);
221}
222
223extern int ip6_ra_control(struct sock *sk, int sel);
224
225extern int ipv6_parse_hopopts(struct sk_buff *skb);
226
227extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
228extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
229 int newtype,
230 struct ipv6_opt_hdr __user *newopt,
231 int newoptlen);
232struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
233 struct ipv6_txoptions *opt);
234
235extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
236
237int ip6_frag_nqueues(struct net *net);
238int ip6_frag_mem(struct net *net);
239
240#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
241
242extern int __ipv6_addr_type(const struct in6_addr *addr);
243static inline int ipv6_addr_type(const struct in6_addr *addr)
244{
245 return __ipv6_addr_type(addr) & 0xffff;
246}
247
248static inline int ipv6_addr_scope(const struct in6_addr *addr)
249{
250 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
251}
252
253static inline int __ipv6_addr_src_scope(int type)
254{
255 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
256}
257
258static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
259{
260 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
261}
262
263static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
264{
265 return memcmp(a1, a2, sizeof(struct in6_addr));
266}
267
268static inline int
269ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
270 const struct in6_addr *a2)
271{
272 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
273 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
274 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
275 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
276}
277
278static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
279{
280 memcpy(a1, a2, sizeof(struct in6_addr));
281}
282
283static inline void ipv6_addr_prefix(struct in6_addr *pfx,
284 const struct in6_addr *addr,
285 int plen)
286{
287 /* caller must guarantee 0 <= plen <= 128 */
288 int o = plen >> 3,
289 b = plen & 0x7;
290
291 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
292 memcpy(pfx->s6_addr, addr, o);
293 if (b != 0)
294 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
295}
296
297static inline void ipv6_addr_set(struct in6_addr *addr,
298 __be32 w1, __be32 w2,
299 __be32 w3, __be32 w4)
300{
301 addr->s6_addr32[0] = w1;
302 addr->s6_addr32[1] = w2;
303 addr->s6_addr32[2] = w3;
304 addr->s6_addr32[3] = w4;
305}
306
307static inline int ipv6_addr_equal(const struct in6_addr *a1,
308 const struct in6_addr *a2)
309{
310 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
311 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
312 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
313 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
314}
315
316static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
317 unsigned int prefixlen)
318{
319 unsigned pdw, pbi;
320
321 /* check complete u32 in prefix */
322 pdw = prefixlen >> 5;
323 if (pdw && memcmp(a1, a2, pdw << 2))
324 return 0;
325
326 /* check incomplete u32 in prefix */
327 pbi = prefixlen & 0x1f;
328 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
329 return 0;
330
331 return 1;
332}
333
334static inline int ipv6_prefix_equal(const struct in6_addr *a1,
335 const struct in6_addr *a2,
336 unsigned int prefixlen)
337{
338 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
339 prefixlen);
340}
341
342struct inet_frag_queue;
343
344struct ip6_create_arg {
345 __be32 id;
346 struct in6_addr *src;
347 struct in6_addr *dst;
348};
349
350void ip6_frag_init(struct inet_frag_queue *q, void *a);
351int ip6_frag_match(struct inet_frag_queue *q, void *a);
352
353static inline int ipv6_addr_any(const struct in6_addr *a)
354{
355 return ((a->s6_addr32[0] | a->s6_addr32[1] |
356 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
357}
358
359static inline int ipv6_addr_loopback(const struct in6_addr *a)
360{
361 return ((a->s6_addr32[0] | a->s6_addr32[1] |
362 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
363}
364
365static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
366{
367 return ((a->s6_addr32[0] | a->s6_addr32[1] |
368 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
369}
370
371/*
372 * Check for a RFC 4843 ORCHID address
373 * (Overlay Routable Cryptographic Hash Identifiers)
374 */
375static inline int ipv6_addr_orchid(const struct in6_addr *a)
376{
377 return ((a->s6_addr32[0] & htonl(0xfffffff0))
378 == htonl(0x20010010));
379}
380
381static inline void ipv6_addr_set_v4mapped(const __be32 addr,
382 struct in6_addr *v4mapped)
383{
384 ipv6_addr_set(v4mapped,
385 0, 0,
386 htonl(0x0000FFFF),
387 addr);
388}
389
390/*
391 * find the first different bit between two addresses
392 * length of address must be a multiple of 32bits
393 */
394static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
395{
396 const __be32 *a1 = token1, *a2 = token2;
397 int i;
398
399 addrlen >>= 2;
400
401 for (i = 0; i < addrlen; i++) {
402 __be32 xb = a1[i] ^ a2[i];
403 if (xb)
404 return i * 32 + 32 - fls(ntohl(xb));
405 }
406
407 /*
408 * we should *never* get to this point since that
409 * would mean the addrs are equal
410 *
411 * However, we do get to it 8) And exacly, when
412 * addresses are equal 8)
413 *
414 * ip route add 1111::/128 via ...
415 * ip route add 1111::/64 via ...
416 * and we are here.
417 *
418 * Ideally, this function should stop comparison
419 * at prefix length. It does not, but it is still OK,
420 * if returned value is greater than prefix length.
421 * --ANK (980803)
422 */
423 return (addrlen << 5);
424}
425
426static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
427{
428 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
429}
430
431/*
432 * Prototypes exported by ipv6
433 */
434
435/*
436 * rcv function (called from netdevice level)
437 */
438
439extern int ipv6_rcv(struct sk_buff *skb,
440 struct net_device *dev,
441 struct packet_type *pt,
442 struct net_device *orig_dev);
443
444extern int ip6_rcv_finish(struct sk_buff *skb);
445
446/*
447 * upper-layer output functions
448 */
449extern int ip6_xmit(struct sock *sk,
450 struct sk_buff *skb,
451 struct flowi *fl,
452 struct ipv6_txoptions *opt,
453 int ipfragok);
454
455extern int ip6_nd_hdr(struct sock *sk,
456 struct sk_buff *skb,
457 struct net_device *dev,
458 const struct in6_addr *saddr,
459 const struct in6_addr *daddr,
460 int proto, int len);
461
462extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
463
464extern int ip6_append_data(struct sock *sk,
465 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
466 void *from,
467 int length,
468 int transhdrlen,
469 int hlimit,
470 int tclass,
471 struct ipv6_txoptions *opt,
472 struct flowi *fl,
473 struct rt6_info *rt,
474 unsigned int flags);
475
476extern int ip6_push_pending_frames(struct sock *sk);
477
478extern void ip6_flush_pending_frames(struct sock *sk);
479
480extern int ip6_dst_lookup(struct sock *sk,
481 struct dst_entry **dst,
482 struct flowi *fl);
483extern int ip6_dst_blackhole(struct sock *sk,
484 struct dst_entry **dst,
485 struct flowi *fl);
486extern int ip6_sk_dst_lookup(struct sock *sk,
487 struct dst_entry **dst,
488 struct flowi *fl);
489
490/*
491 * skb processing functions
492 */
493
494extern int ip6_output(struct sk_buff *skb);
495extern int ip6_forward(struct sk_buff *skb);
496extern int ip6_input(struct sk_buff *skb);
497extern int ip6_mc_input(struct sk_buff *skb);
498
499extern int __ip6_local_out(struct sk_buff *skb);
500extern int ip6_local_out(struct sk_buff *skb);
501
502/*
503 * Extension header (options) processing
504 */
505
506extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
507 struct ipv6_txoptions *opt,
508 u8 *proto,
509 struct in6_addr **daddr_p);
510extern void ipv6_push_frag_opts(struct sk_buff *skb,
511 struct ipv6_txoptions *opt,
512 u8 *proto);
513
514extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
515 u8 *nexthdrp);
516
517extern int ipv6_ext_hdr(u8 nexthdr);
518
519extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
520
521/*
522 * socket options (ipv6_sockglue.c)
523 */
524
525extern int ipv6_setsockopt(struct sock *sk, int level,
526 int optname,
527 char __user *optval,
528 int optlen);
529extern int ipv6_getsockopt(struct sock *sk, int level,
530 int optname,
531 char __user *optval,
532 int __user *optlen);
533extern int compat_ipv6_setsockopt(struct sock *sk,
534 int level,
535 int optname,
536 char __user *optval,
537 int optlen);
538extern int compat_ipv6_getsockopt(struct sock *sk,
539 int level,
540 int optname,
541 char __user *optval,
542 int __user *optlen);
543
544extern int ip6_datagram_connect(struct sock *sk,
545 struct sockaddr *addr, int addr_len);
546
547extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
548extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
549 u32 info, u8 *payload);
550extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
551
552extern int inet6_release(struct socket *sock);
553extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
554 int addr_len);
555extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
556 int *uaddr_len, int peer);
557extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
558 unsigned long arg);
559
560extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
561 struct sock *sk);
562
563/*
564 * reassembly.c
565 */
566extern const struct proto_ops inet6_stream_ops;
567extern const struct proto_ops inet6_dgram_ops;
568
569struct group_source_req;
570struct group_filter;
571
572extern int ip6_mc_source(int add, int omode, struct sock *sk,
573 struct group_source_req *pgsr);
574extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
575extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
576 struct group_filter __user *optval,
577 int __user *optlen);
578extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
579 const struct in6_addr *daddr, u32 rnd);
580
581#ifdef CONFIG_PROC_FS
582extern int ac6_proc_init(struct net *net);
583extern void ac6_proc_exit(struct net *net);
584extern int raw6_proc_init(void);
585extern void raw6_proc_exit(void);
586extern int tcp6_proc_init(struct net *net);
587extern void tcp6_proc_exit(struct net *net);
588extern int udp6_proc_init(struct net *net);
589extern void udp6_proc_exit(struct net *net);
590extern int udplite6_proc_init(void);
591extern void udplite6_proc_exit(void);
592extern int ipv6_misc_proc_init(void);
593extern void ipv6_misc_proc_exit(void);
594extern int snmp6_register_dev(struct inet6_dev *idev);
595extern int snmp6_unregister_dev(struct inet6_dev *idev);
596
597#else
598static inline int ac6_proc_init(struct net *net) { return 0; }
599static inline void ac6_proc_exit(struct net *net) { }
600static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
601static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
602#endif
603
604#ifdef CONFIG_SYSCTL
605extern ctl_table ipv6_route_table_template[];
606extern ctl_table ipv6_icmp_table_template[];
607
608extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
609extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
610extern int ipv6_sysctl_register(void);
611extern void ipv6_sysctl_unregister(void);
612extern int ipv6_static_sysctl_register(void);
613extern void ipv6_static_sysctl_unregister(void);
614#endif
615
616#endif /* __KERNEL__ */
617#endif /* _NET_IPV6_H */