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