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[IPV6]: Fix sending extension headers before and including routing header.
[deliverable/linux.git] / include / net / ipv6.h
CommitLineData
1da177e4
LT		 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
20380731 107#include <linux/config.h>
1da177e4
LT		 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)
1da177e4
LT		 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 */
1da177e4
LT		 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);
333fad53
YH		 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);
df9890c3
YH		 240struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
241 struct ipv6_txoptions *opt);
1da177e4
LT		 242
243extern int ip6_frag_nqueues;
244extern atomic_t ip6_frag_mem;
245
246#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
247
248/*
249 * Function prototype for build_xmit
250 */
251
252typedef int (*inet_getfrag_t) (const void *data,
253 struct in6_addr *addr,
254 char *,
255 unsigned int, unsigned int);
256
257
258extern int ipv6_addr_type(const struct in6_addr *addr);
259
260static inline int ipv6_addr_scope(const struct in6_addr *addr)
261{
262 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
263}
264
265static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
266{
267 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
268}
269
270static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
271{
272 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
273}
274
275static inline void ipv6_addr_prefix(struct in6_addr *pfx,
276 const struct in6_addr *addr,
277 int plen)
278{
279 /* caller must guarantee 0 <= plen <= 128 */
280 int o = plen >> 3,
281 b = plen & 0x7;
282
283 memcpy(pfx->s6_addr, addr, o);
284 if (b != 0) {
285 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
286 o++;
287 }
288 if (o < 16)
289 memset(pfx->s6_addr + o, 0, 16 - o);
290}
291
292#ifndef __HAVE_ARCH_ADDR_SET
293static inline void ipv6_addr_set(struct in6_addr *addr,
294 __u32 w1, __u32 w2,
295 __u32 w3, __u32 w4)
296{
297 addr->s6_addr32[0] = w1;
298 addr->s6_addr32[1] = w2;
299 addr->s6_addr32[2] = w3;
300 addr->s6_addr32[3] = w4;
301}
302#endif
303
304static inline int ipv6_addr_equal(const struct in6_addr *a1,
305 const struct in6_addr *a2)
306{
307 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
308 a1->s6_addr32[1] == a2->s6_addr32[1] &&
309 a1->s6_addr32[2] == a2->s6_addr32[2] &&
310 a1->s6_addr32[3] == a2->s6_addr32[3]);
311}
312
313static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
314 unsigned int prefixlen)
315{
316 unsigned pdw, pbi;
317
318 /* check complete u32 in prefix */
319 pdw = prefixlen >> 5;
320 if (pdw && memcmp(a1, a2, pdw << 2))
321 return 0;
322
323 /* check incomplete u32 in prefix */
324 pbi = prefixlen & 0x1f;
325 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
326 return 0;
327
328 return 1;
329}
330
331static inline int ipv6_prefix_equal(const struct in6_addr *a1,
332 const struct in6_addr *a2,
333 unsigned int prefixlen)
334{
335 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
336 prefixlen);
337}
338
339static inline int ipv6_addr_any(const struct in6_addr *a)
340{
341 return ((a->s6_addr32[0] | a->s6_addr32[1] |
342 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
343}
344
345/*
346 * Prototypes exported by ipv6
347 */
348
349/*
350 * rcv function (called from netdevice level)
351 */
352
353extern int ipv6_rcv(struct sk_buff *skb,
354 struct net_device *dev,
f2ccd8fa
DM		 355 struct packet_type *pt,
356 struct net_device *orig_dev);
1da177e4
LT		 357
358/*
359 * upper-layer output functions
360 */
361extern int ip6_xmit(struct sock *sk,
362 struct sk_buff *skb,
363 struct flowi *fl,
364 struct ipv6_txoptions *opt,
365 int ipfragok);
366
367extern int ip6_nd_hdr(struct sock *sk,
368 struct sk_buff *skb,
369 struct net_device *dev,
370 struct in6_addr *saddr,
371 struct in6_addr *daddr,
372 int proto, int len);
373
374extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
375
376extern int ip6_append_data(struct sock *sk,
377 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
378 void *from,
379 int length,
380 int transhdrlen,
381 int hlimit,
41a1f8ea 382 int tclass,
1da177e4
LT		 383 struct ipv6_txoptions *opt,
384 struct flowi *fl,
385 struct rt6_info *rt,
386 unsigned int flags);
387
388extern int ip6_push_pending_frames(struct sock *sk);
389
390extern void ip6_flush_pending_frames(struct sock *sk);
391
392extern int ip6_dst_lookup(struct sock *sk,
393 struct dst_entry **dst,
394 struct flowi *fl);
395
396/*
397 * skb processing functions
398 */
399
400extern int ip6_output(struct sk_buff *skb);
401extern int ip6_forward(struct sk_buff *skb);
402extern int ip6_input(struct sk_buff *skb);
403extern int ip6_mc_input(struct sk_buff *skb);
404
405/*
406 * Extension header (options) processing
407 */
408
409extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
410 u8 *prev_hdr,
411 struct ipv6_txoptions *opt,
412 struct in6_addr *daddr,
413 u32 jumbolen);
414extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
415 u8 *prev_hdr,
416 struct ipv6_txoptions *opt);
417extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
418 struct ipv6_txoptions *opt,
419 u8 *proto,
420 struct in6_addr **daddr_p);
421extern void ipv6_push_frag_opts(struct sk_buff *skb,
422 struct ipv6_txoptions *opt,
423 u8 *proto);
424
425extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
0d3d077c 426 u8 *nexthdrp);
1da177e4
LT		 427
428extern int ipv6_ext_hdr(u8 nexthdr);
429
430extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
431 struct ipv6_rt_hdr *hdr);
432
433
434/*
435 * socket options (ipv6_sockglue.c)
436 */
437
438extern int ipv6_setsockopt(struct sock *sk, int level,
439 int optname,
440 char __user *optval,
441 int optlen);
442extern int ipv6_getsockopt(struct sock *sk, int level,
443 int optname,
444 char __user *optval,
445 int __user *optlen);
446
447extern void ipv6_packet_init(void);
448
449extern void ipv6_packet_cleanup(void);
450
451extern int ip6_datagram_connect(struct sock *sk,
452 struct sockaddr *addr, int addr_len);
453
454extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
455extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
456 u32 info, u8 *payload);
457extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
458
459extern int inet6_release(struct socket *sock);
460extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
461 int addr_len);
462extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
463 int *uaddr_len, int peer);
464extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
465 unsigned long arg);
466
467/*
468 * reassembly.c
469 */
470extern int sysctl_ip6frag_high_thresh;
471extern int sysctl_ip6frag_low_thresh;
472extern int sysctl_ip6frag_time;
473extern int sysctl_ip6frag_secret_interval;
474
20380731
ACM		 475extern struct proto_ops inet6_stream_ops;
476extern struct proto_ops inet6_dgram_ops;
477
478extern int ip6_mc_source(int add, int omode, struct sock *sk,
479 struct group_source_req *pgsr);
480extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
481extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
482 struct group_filter __user *optval,
483 int __user *optlen);
484
485#ifdef CONFIG_PROC_FS
486extern int ac6_proc_init(void);
487extern void ac6_proc_exit(void);
488extern int raw6_proc_init(void);
489extern void raw6_proc_exit(void);
490extern int tcp6_proc_init(void);
491extern void tcp6_proc_exit(void);
492extern int udp6_proc_init(void);
493extern void udp6_proc_exit(void);
494extern int ipv6_misc_proc_init(void);
495extern void ipv6_misc_proc_exit(void);
496
497extern struct rt6_statistics rt6_stats;
498#endif
1da177e4 499
20380731
ACM		 500#ifdef CONFIG_SYSCTL
501extern ctl_table ipv6_route_table[];
502extern ctl_table ipv6_icmp_table[];
1da177e4 503
20380731
ACM		 504extern void ipv6_sysctl_register(void);
505extern void ipv6_sysctl_unregister(void);
506#endif
1da177e4 507
20380731
ACM		 508#endif /* __KERNEL__ */
509#endif /* _NET_IPV6_H */
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