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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/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
97struct 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 */
111extern int sysctl_ipv6_bindv6only;
112extern int sysctl_mld_max_msf;
113
114/* MIBs */
115DECLARE_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})
134DECLARE_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})
160DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
161DECLARE_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
169int snmp6_register_dev(struct inet6_dev *idev);
170int snmp6_unregister_dev(struct inet6_dev *idev);
171int snmp6_alloc_dev(struct inet6_dev *idev);
172int snmp6_free_dev(struct inet6_dev *idev);
173int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
174void snmp6_mib_free(void *ptr[2]);
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 struct in6_addr dst;
215 struct ipv6_txoptions *opt;
216 atomic_t users;
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 **skbp);
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
264extern int ip6_frag_nqueues;
265extern atomic_t ip6_frag_mem;
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((const void *) a1, (const void *) 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((void *) a1, (const void *) 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 memcpy(pfx->s6_addr, addr, o);
330 if (b != 0) {
331 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
332 o++;
333 }
334 if (o < 16)
335 memset(pfx->s6_addr + o, 0, 16 - o);
336}
337
338#ifndef __HAVE_ARCH_ADDR_SET
339static inline void ipv6_addr_set(struct in6_addr *addr,
340 __be32 w1, __be32 w2,
341 __be32 w3, __be32 w4)
342{
343 addr->s6_addr32[0] = w1;
344 addr->s6_addr32[1] = w2;
345 addr->s6_addr32[2] = w3;
346 addr->s6_addr32[3] = w4;
347}
348#endif
349
350static inline int ipv6_addr_equal(const struct in6_addr *a1,
351 const struct in6_addr *a2)
352{
353 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
354 a1->s6_addr32[1] == a2->s6_addr32[1] &&
355 a1->s6_addr32[2] == a2->s6_addr32[2] &&
356 a1->s6_addr32[3] == a2->s6_addr32[3]);
357}
358
359static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
360 unsigned int prefixlen)
361{
362 unsigned pdw, pbi;
363
364 /* check complete u32 in prefix */
365 pdw = prefixlen >> 5;
366 if (pdw && memcmp(a1, a2, pdw << 2))
367 return 0;
368
369 /* check incomplete u32 in prefix */
370 pbi = prefixlen & 0x1f;
371 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
372 return 0;
373
374 return 1;
375}
376
377static inline int ipv6_prefix_equal(const struct in6_addr *a1,
378 const struct in6_addr *a2,
379 unsigned int prefixlen)
380{
381 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
382 prefixlen);
383}
384
385static inline int ipv6_addr_any(const struct in6_addr *a)
386{
387 return ((a->s6_addr32[0] | a->s6_addr32[1] |
388 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
389}
390
391/*
392 * find the first different bit between two addresses
393 * length of address must be a multiple of 32bits
394 */
395static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
396{
397 const __be32 *a1 = token1, *a2 = token2;
398 int i;
399
400 addrlen >>= 2;
401
402 for (i = 0; i < addrlen; i++) {
403 __be32 xb = a1[i] ^ a2[i];
404 if (xb)
405 return i * 32 + 32 - fls(ntohl(xb));
406 }
407
408 /*
409 * we should *never* get to this point since that
410 * would mean the addrs are equal
411 *
412 * However, we do get to it 8) And exacly, when
413 * addresses are equal 8)
414 *
415 * ip route add 1111::/128 via ...
416 * ip route add 1111::/64 via ...
417 * and we are here.
418 *
419 * Ideally, this function should stop comparison
420 * at prefix length. It does not, but it is still OK,
421 * if returned value is greater than prefix length.
422 * --ANK (980803)
423 */
424 return (addrlen << 5);
425}
426
427static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
428{
429 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
430}
431
432/*
433 * Prototypes exported by ipv6
434 */
435
436/*
437 * rcv function (called from netdevice level)
438 */
439
440extern int ipv6_rcv(struct sk_buff *skb,
441 struct net_device *dev,
442 struct packet_type *pt,
443 struct net_device *orig_dev);
444
445extern int ip6_rcv_finish(struct sk_buff *skb);
446
447/*
448 * upper-layer output functions
449 */
450extern int ip6_xmit(struct sock *sk,
451 struct sk_buff *skb,
452 struct flowi *fl,
453 struct ipv6_txoptions *opt,
454 int ipfragok);
455
456extern int ip6_nd_hdr(struct sock *sk,
457 struct sk_buff *skb,
458 struct net_device *dev,
459 struct in6_addr *saddr,
460 struct in6_addr *daddr,
461 int proto, int len);
462
463extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
464
465extern int ip6_append_data(struct sock *sk,
466 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
467 void *from,
468 int length,
469 int transhdrlen,
470 int hlimit,
471 int tclass,
472 struct ipv6_txoptions *opt,
473 struct flowi *fl,
474 struct rt6_info *rt,
475 unsigned int flags);
476
477extern int ip6_push_pending_frames(struct sock *sk);
478
479extern void ip6_flush_pending_frames(struct sock *sk);
480
481extern int ip6_dst_lookup(struct sock *sk,
482 struct dst_entry **dst,
483 struct flowi *fl);
484extern int ip6_sk_dst_lookup(struct sock *sk,
485 struct dst_entry **dst,
486 struct flowi *fl);
487
488/*
489 * skb processing functions
490 */
491
492extern int ip6_output(struct sk_buff *skb);
493extern int ip6_forward(struct sk_buff *skb);
494extern int ip6_input(struct sk_buff *skb);
495extern int ip6_mc_input(struct sk_buff *skb);
496
497/*
498 * Extension header (options) processing
499 */
500
501extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
502 u8 *prev_hdr,
503 struct ipv6_txoptions *opt,
504 struct in6_addr *daddr,
505 u32 jumbolen);
506extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
507 u8 *prev_hdr,
508 struct ipv6_txoptions *opt);
509extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
510 struct ipv6_txoptions *opt,
511 u8 *proto,
512 struct in6_addr **daddr_p);
513extern void ipv6_push_frag_opts(struct sk_buff *skb,
514 struct ipv6_txoptions *opt,
515 u8 *proto);
516
517extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
518 u8 *nexthdrp);
519
520extern int ipv6_ext_hdr(u8 nexthdr);
521
522extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
523
524extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
525 struct ipv6_rt_hdr *hdr);
526
527
528/*
529 * socket options (ipv6_sockglue.c)
530 */
531
532extern int ipv6_setsockopt(struct sock *sk, int level,
533 int optname,
534 char __user *optval,
535 int optlen);
536extern int ipv6_getsockopt(struct sock *sk, int level,
537 int optname,
538 char __user *optval,
539 int __user *optlen);
540extern int compat_ipv6_setsockopt(struct sock *sk,
541 int level,
542 int optname,
543 char __user *optval,
544 int optlen);
545extern int compat_ipv6_getsockopt(struct sock *sk,
546 int level,
547 int optname,
548 char __user *optval,
549 int __user *optlen);
550
551extern void ipv6_packet_init(void);
552
553extern void ipv6_packet_cleanup(void);
554
555extern int ip6_datagram_connect(struct sock *sk,
556 struct sockaddr *addr, int addr_len);
557
558extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
559extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
560 u32 info, u8 *payload);
561extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
562
563extern int inet6_release(struct socket *sock);
564extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
565 int addr_len);
566extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
567 int *uaddr_len, int peer);
568extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
569 unsigned long arg);
570
571extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
572 struct sock *sk);
573
574/*
575 * reassembly.c
576 */
577extern int sysctl_ip6frag_high_thresh;
578extern int sysctl_ip6frag_low_thresh;
579extern int sysctl_ip6frag_time;
580extern int sysctl_ip6frag_secret_interval;
581
582extern const struct proto_ops inet6_stream_ops;
583extern const struct proto_ops inet6_dgram_ops;
584
585struct group_source_req;
586struct group_filter;
587
588extern int ip6_mc_source(int add, int omode, struct sock *sk,
589 struct group_source_req *pgsr);
590extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
591extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
592 struct group_filter __user *optval,
593 int __user *optlen);
594
595#ifdef CONFIG_PROC_FS
596extern int ac6_proc_init(void);
597extern void ac6_proc_exit(void);
598extern int raw6_proc_init(void);
599extern void raw6_proc_exit(void);
600extern int tcp6_proc_init(void);
601extern void tcp6_proc_exit(void);
602extern int udp6_proc_init(void);
603extern void udp6_proc_exit(void);
604extern int udplite6_proc_init(void);
605extern void udplite6_proc_exit(void);
606extern int ipv6_misc_proc_init(void);
607extern void ipv6_misc_proc_exit(void);
608
609extern struct rt6_statistics rt6_stats;
610#endif
611
612#ifdef CONFIG_SYSCTL
613extern ctl_table ipv6_route_table[];
614extern ctl_table ipv6_icmp_table[];
615
616extern void ipv6_sysctl_register(void);
617extern void ipv6_sysctl_unregister(void);
618#endif
619
620#endif /* __KERNEL__ */
621#endif /* _NET_IPV6_H */