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/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
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 unsigned char nexthdr;
98 unsigned char reserved;
99 unsigned short frag_off;
100 __u32 identification;
101};
102
103#define IP6_MF 0x0001
104
105#ifdef __KERNEL__
106
107#include <linux/config.h>
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(field) SNMP_INC_STATS(ipv6_statistics, field)
117#define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
118#define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
119DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
120#define ICMP6_INC_STATS(idev, field) ({ \
121 struct inet6_dev *_idev = (idev); \
122 if (likely(_idev != NULL)) \
123 SNMP_INC_STATS(idev->stats.icmpv6, field); \
124 SNMP_INC_STATS(icmpv6_statistics, field); \
125})
126#define ICMP6_INC_STATS_BH(idev, field) ({ \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
130 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
131})
132#define ICMP6_INC_STATS_USER(idev, field) ({ \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
136 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
137})
138#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
139 struct inet6_dev *_idev = idev; \
140 __typeof__(offset) _offset = (offset); \
141 if (likely(_idev != NULL)) \
142 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
143 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
144})
145DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
146#define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
147#define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
148#define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
149
150int snmp6_register_dev(struct inet6_dev *idev);
151int snmp6_unregister_dev(struct inet6_dev *idev);
152int snmp6_alloc_dev(struct inet6_dev *idev);
153int snmp6_free_dev(struct inet6_dev *idev);
154int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
155void snmp6_mib_free(void *ptr[2]);
156
157struct ip6_ra_chain
158{
159 struct ip6_ra_chain *next;
160 struct sock *sk;
161 int sel;
162 void (*destructor)(struct sock *);
163};
164
165extern struct ip6_ra_chain *ip6_ra_chain;
166extern rwlock_t ip6_ra_lock;
167
168/*
169 This structure is prepared by protocol, when parsing
170 ancillary data and passed to IPv6.
171 */
172
173struct ipv6_txoptions
174{
175 /* Length of this structure */
176 int tot_len;
177
178 /* length of extension headers */
179
180 __u16 opt_flen; /* after fragment hdr */
181 __u16 opt_nflen; /* before fragment hdr */
182
183 struct ipv6_opt_hdr *hopopt;
184 struct ipv6_opt_hdr *dst0opt;
185 struct ipv6_rt_hdr *srcrt; /* Routing Header */
186 struct ipv6_opt_hdr *dst1opt;
187
188 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
189};
190
191struct ip6_flowlabel
192{
193 struct ip6_flowlabel *next;
194 u32 label;
195 struct in6_addr dst;
196 struct ipv6_txoptions *opt;
197 atomic_t users;
198 unsigned long linger;
199 u8 share;
200 u32 owner;
201 unsigned long lastuse;
202 unsigned long expires;
203};
204
205#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
206#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
207
208struct ipv6_fl_socklist
209{
210 struct ipv6_fl_socklist *next;
211 struct ip6_flowlabel *fl;
212};
213
214extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
215extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
216 struct ip6_flowlabel * fl,
217 struct ipv6_txoptions * fopt);
218extern void fl6_free_socklist(struct sock *sk);
219extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
220extern void ip6_flowlabel_init(void);
221extern void ip6_flowlabel_cleanup(void);
222
223static inline void fl6_sock_release(struct ip6_flowlabel *fl)
224{
225 if (fl)
226 atomic_dec(&fl->users);
227}
228
229extern int ip6_ra_control(struct sock *sk, int sel,
230 void (*destructor)(struct sock *));
231
232
233extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
234
235extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
236extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
237 int newtype,
238 struct ipv6_opt_hdr __user *newopt,
239 int newoptlen);
240
241extern int ip6_frag_nqueues;
242extern atomic_t ip6_frag_mem;
243
244#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
245
246/*
247 * Function prototype for build_xmit
248 */
249
250typedef int (*inet_getfrag_t) (const void *data,
251 struct in6_addr *addr,
252 char *,
253 unsigned int, unsigned int);
254
255
256extern int ipv6_addr_type(const struct in6_addr *addr);
257
258static inline int ipv6_addr_scope(const struct in6_addr *addr)
259{
260 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
261}
262
263static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
264{
265 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
266}
267
268static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
269{
270 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
271}
272
273static inline void ipv6_addr_prefix(struct in6_addr *pfx,
274 const struct in6_addr *addr,
275 int plen)
276{
277 /* caller must guarantee 0 <= plen <= 128 */
278 int o = plen >> 3,
279 b = plen & 0x7;
280
281 memcpy(pfx->s6_addr, addr, o);
282 if (b != 0) {
283 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
284 o++;
285 }
286 if (o < 16)
287 memset(pfx->s6_addr + o, 0, 16 - o);
288}
289
290#ifndef __HAVE_ARCH_ADDR_SET
291static inline void ipv6_addr_set(struct in6_addr *addr,
292 __u32 w1, __u32 w2,
293 __u32 w3, __u32 w4)
294{
295 addr->s6_addr32[0] = w1;
296 addr->s6_addr32[1] = w2;
297 addr->s6_addr32[2] = w3;
298 addr->s6_addr32[3] = w4;
299}
300#endif
301
302static inline int ipv6_addr_equal(const struct in6_addr *a1,
303 const struct in6_addr *a2)
304{
305 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
306 a1->s6_addr32[1] == a2->s6_addr32[1] &&
307 a1->s6_addr32[2] == a2->s6_addr32[2] &&
308 a1->s6_addr32[3] == a2->s6_addr32[3]);
309}
310
311static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
312 unsigned int prefixlen)
313{
314 unsigned pdw, pbi;
315
316 /* check complete u32 in prefix */
317 pdw = prefixlen >> 5;
318 if (pdw && memcmp(a1, a2, pdw << 2))
319 return 0;
320
321 /* check incomplete u32 in prefix */
322 pbi = prefixlen & 0x1f;
323 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
324 return 0;
325
326 return 1;
327}
328
329static inline int ipv6_prefix_equal(const struct in6_addr *a1,
330 const struct in6_addr *a2,
331 unsigned int prefixlen)
332{
333 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
334 prefixlen);
335}
336
337static inline int ipv6_addr_any(const struct in6_addr *a)
338{
339 return ((a->s6_addr32[0] | a->s6_addr32[1] |
340 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
341}
342
343/*
344 * Prototypes exported by ipv6
345 */
346
347/*
348 * rcv function (called from netdevice level)
349 */
350
351extern int ipv6_rcv(struct sk_buff *skb,
352 struct net_device *dev,
353 struct packet_type *pt,
354 struct net_device *orig_dev);
355
356/*
357 * upper-layer output functions
358 */
359extern int ip6_xmit(struct sock *sk,
360 struct sk_buff *skb,
361 struct flowi *fl,
362 struct ipv6_txoptions *opt,
363 int ipfragok);
364
365extern int ip6_nd_hdr(struct sock *sk,
366 struct sk_buff *skb,
367 struct net_device *dev,
368 struct in6_addr *saddr,
369 struct in6_addr *daddr,
370 int proto, int len);
371
372extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
373
374extern int ip6_append_data(struct sock *sk,
375 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
376 void *from,
377 int length,
378 int transhdrlen,
379 int hlimit,
380 int tclass,
381 struct ipv6_txoptions *opt,
382 struct flowi *fl,
383 struct rt6_info *rt,
384 unsigned int flags);
385
386extern int ip6_push_pending_frames(struct sock *sk);
387
388extern void ip6_flush_pending_frames(struct sock *sk);
389
390extern int ip6_dst_lookup(struct sock *sk,
391 struct dst_entry **dst,
392 struct flowi *fl);
393
394/*
395 * skb processing functions
396 */
397
398extern int ip6_output(struct sk_buff *skb);
399extern int ip6_forward(struct sk_buff *skb);
400extern int ip6_input(struct sk_buff *skb);
401extern int ip6_mc_input(struct sk_buff *skb);
402
403/*
404 * Extension header (options) processing
405 */
406
407extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
408 u8 *prev_hdr,
409 struct ipv6_txoptions *opt,
410 struct in6_addr *daddr,
411 u32 jumbolen);
412extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
413 u8 *prev_hdr,
414 struct ipv6_txoptions *opt);
415extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
416 struct ipv6_txoptions *opt,
417 u8 *proto,
418 struct in6_addr **daddr_p);
419extern void ipv6_push_frag_opts(struct sk_buff *skb,
420 struct ipv6_txoptions *opt,
421 u8 *proto);
422
423extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
424 u8 *nexthdrp);
425
426extern int ipv6_ext_hdr(u8 nexthdr);
427
428extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
429 struct ipv6_rt_hdr *hdr);
430
431
432/*
433 * socket options (ipv6_sockglue.c)
434 */
435
436extern int ipv6_setsockopt(struct sock *sk, int level,
437 int optname,
438 char __user *optval,
439 int optlen);
440extern int ipv6_getsockopt(struct sock *sk, int level,
441 int optname,
442 char __user *optval,
443 int __user *optlen);
444
445extern void ipv6_packet_init(void);
446
447extern void ipv6_packet_cleanup(void);
448
449extern int ip6_datagram_connect(struct sock *sk,
450 struct sockaddr *addr, int addr_len);
451
452extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
453extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
454 u32 info, u8 *payload);
455extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
456
457extern int inet6_release(struct socket *sock);
458extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
459 int addr_len);
460extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
461 int *uaddr_len, int peer);
462extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
463 unsigned long arg);
464
465/*
466 * reassembly.c
467 */
468extern int sysctl_ip6frag_high_thresh;
469extern int sysctl_ip6frag_low_thresh;
470extern int sysctl_ip6frag_time;
471extern int sysctl_ip6frag_secret_interval;
472
473extern struct proto_ops inet6_stream_ops;
474extern struct proto_ops inet6_dgram_ops;
475
476extern int ip6_mc_source(int add, int omode, struct sock *sk,
477 struct group_source_req *pgsr);
478extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
479extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
480 struct group_filter __user *optval,
481 int __user *optlen);
482
483#ifdef CONFIG_PROC_FS
484extern int ac6_proc_init(void);
485extern void ac6_proc_exit(void);
486extern int raw6_proc_init(void);
487extern void raw6_proc_exit(void);
488extern int tcp6_proc_init(void);
489extern void tcp6_proc_exit(void);
490extern int udp6_proc_init(void);
491extern void udp6_proc_exit(void);
492extern int ipv6_misc_proc_init(void);
493extern void ipv6_misc_proc_exit(void);
494
495extern struct rt6_statistics rt6_stats;
496#endif
497
498#ifdef CONFIG_SYSCTL
499extern ctl_table ipv6_route_table[];
500extern ctl_table ipv6_icmp_table[];
501
502extern void ipv6_sysctl_register(void);
503extern void ipv6_sysctl_unregister(void);
504#endif
505
506#endif /* __KERNEL__ */
507#endif /* _NET_IPV6_H */