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 <net/sock.h>
108
109/* sysctls */
110extern int sysctl_ipv6_bindv6only;
111extern int sysctl_mld_max_msf;
112
113/* MIBs */
114DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
115#define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
116#define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
117#define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
118DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
119#define ICMP6_INC_STATS(idev, field) ({ \
120 struct inet6_dev *_idev = (idev); \
121 if (likely(_idev != NULL)) \
122 SNMP_INC_STATS(idev->stats.icmpv6, field); \
123 SNMP_INC_STATS(icmpv6_statistics, field); \
124})
125#define ICMP6_INC_STATS_BH(idev, field) ({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
129 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
130})
131#define ICMP6_INC_STATS_USER(idev, field) ({ \
132 struct inet6_dev *_idev = (idev); \
133 if (likely(_idev != NULL)) \
134 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
135 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
136})
137#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
138 struct inet6_dev *_idev = idev; \
139 __typeof__(offset) _offset = (offset); \
140 if (likely(_idev != NULL)) \
141 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
142 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
143})
144DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
145#define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
146#define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
147#define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
148extern atomic_t inet6_sock_nr;
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 *auth;
187 struct ipv6_opt_hdr *dst1opt;
188
189 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
190};
191
192struct ip6_flowlabel
193{
194 struct ip6_flowlabel *next;
195 u32 label;
196 struct in6_addr dst;
197 struct ipv6_txoptions *opt;
198 atomic_t users;
199 unsigned long linger;
200 u8 share;
201 u32 owner;
202 unsigned long lastuse;
203 unsigned long expires;
204};
205
206#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
207#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
208
209struct ipv6_fl_socklist
210{
211 struct ipv6_fl_socklist *next;
212 struct ip6_flowlabel *fl;
213};
214
215extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
216extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
217 struct ip6_flowlabel * fl,
218 struct ipv6_txoptions * fopt);
219extern void fl6_free_socklist(struct sock *sk);
220extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
221extern void ip6_flowlabel_init(void);
222extern void ip6_flowlabel_cleanup(void);
223
224static inline void fl6_sock_release(struct ip6_flowlabel *fl)
225{
226 if (fl)
227 atomic_dec(&fl->users);
228}
229
230extern int ip6_ra_control(struct sock *sk, int sel,
231 void (*destructor)(struct sock *));
232
233
234extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
235
236extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
237
238extern int ip6_frag_nqueues;
239extern atomic_t ip6_frag_mem;
240
241#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
242
243/*
244 * Function prototype for build_xmit
245 */
246
247typedef int (*inet_getfrag_t) (const void *data,
248 struct in6_addr *addr,
249 char *,
250 unsigned int, unsigned int);
251
252
253extern int ipv6_addr_type(const struct in6_addr *addr);
254
255static inline int ipv6_addr_scope(const struct in6_addr *addr)
256{
257 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
258}
259
260static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
261{
262 return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
263}
264
265static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
266{
267 memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
268}
269
270static inline void ipv6_addr_prefix(struct in6_addr *pfx,
271 const struct in6_addr *addr,
272 int plen)
273{
274 /* caller must guarantee 0 <= plen <= 128 */
275 int o = plen >> 3,
276 b = plen & 0x7;
277
278 memcpy(pfx->s6_addr, addr, o);
279 if (b != 0) {
280 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
281 o++;
282 }
283 if (o < 16)
284 memset(pfx->s6_addr + o, 0, 16 - o);
285}
286
287#ifndef __HAVE_ARCH_ADDR_SET
288static inline void ipv6_addr_set(struct in6_addr *addr,
289 __u32 w1, __u32 w2,
290 __u32 w3, __u32 w4)
291{
292 addr->s6_addr32[0] = w1;
293 addr->s6_addr32[1] = w2;
294 addr->s6_addr32[2] = w3;
295 addr->s6_addr32[3] = w4;
296}
297#endif
298
299static inline int ipv6_addr_equal(const struct in6_addr *a1,
300 const struct in6_addr *a2)
301{
302 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
303 a1->s6_addr32[1] == a2->s6_addr32[1] &&
304 a1->s6_addr32[2] == a2->s6_addr32[2] &&
305 a1->s6_addr32[3] == a2->s6_addr32[3]);
306}
307
308static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
309 unsigned int prefixlen)
310{
311 unsigned pdw, pbi;
312
313 /* check complete u32 in prefix */
314 pdw = prefixlen >> 5;
315 if (pdw && memcmp(a1, a2, pdw << 2))
316 return 0;
317
318 /* check incomplete u32 in prefix */
319 pbi = prefixlen & 0x1f;
320 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
321 return 0;
322
323 return 1;
324}
325
326static inline int ipv6_prefix_equal(const struct in6_addr *a1,
327 const struct in6_addr *a2,
328 unsigned int prefixlen)
329{
330 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
331 prefixlen);
332}
333
334static inline int ipv6_addr_any(const struct in6_addr *a)
335{
336 return ((a->s6_addr32[0] | a->s6_addr32[1] |
337 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
338}
339
340/*
341 * Prototypes exported by ipv6
342 */
343
344/*
345 * rcv function (called from netdevice level)
346 */
347
348extern int ipv6_rcv(struct sk_buff *skb,
349 struct net_device *dev,
350 struct packet_type *pt);
351
352/*
353 * upper-layer output functions
354 */
355extern int ip6_xmit(struct sock *sk,
356 struct sk_buff *skb,
357 struct flowi *fl,
358 struct ipv6_txoptions *opt,
359 int ipfragok);
360
361extern int ip6_nd_hdr(struct sock *sk,
362 struct sk_buff *skb,
363 struct net_device *dev,
364 struct in6_addr *saddr,
365 struct in6_addr *daddr,
366 int proto, int len);
367
368extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
369
370extern int ip6_append_data(struct sock *sk,
371 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
372 void *from,
373 int length,
374 int transhdrlen,
375 int hlimit,
376 struct ipv6_txoptions *opt,
377 struct flowi *fl,
378 struct rt6_info *rt,
379 unsigned int flags);
380
381extern int ip6_push_pending_frames(struct sock *sk);
382
383extern void ip6_flush_pending_frames(struct sock *sk);
384
385extern int ip6_dst_lookup(struct sock *sk,
386 struct dst_entry **dst,
387 struct flowi *fl);
388
389/*
390 * skb processing functions
391 */
392
393extern int ip6_output(struct sk_buff *skb);
394extern int ip6_forward(struct sk_buff *skb);
395extern int ip6_input(struct sk_buff *skb);
396extern int ip6_mc_input(struct sk_buff *skb);
397
398/*
399 * Extension header (options) processing
400 */
401
402extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
403 u8 *prev_hdr,
404 struct ipv6_txoptions *opt,
405 struct in6_addr *daddr,
406 u32 jumbolen);
407extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
408 u8 *prev_hdr,
409 struct ipv6_txoptions *opt);
410extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
411 struct ipv6_txoptions *opt,
412 u8 *proto,
413 struct in6_addr **daddr_p);
414extern void ipv6_push_frag_opts(struct sk_buff *skb,
415 struct ipv6_txoptions *opt,
416 u8 *proto);
417
418extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
419 u8 *nexthdrp);
420
421extern int ipv6_ext_hdr(u8 nexthdr);
422
423extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
424 struct ipv6_rt_hdr *hdr);
425
426
427/*
428 * socket options (ipv6_sockglue.c)
429 */
430
431extern int ipv6_setsockopt(struct sock *sk, int level,
432 int optname,
433 char __user *optval,
434 int optlen);
435extern int ipv6_getsockopt(struct sock *sk, int level,
436 int optname,
437 char __user *optval,
438 int __user *optlen);
439
440extern void ipv6_packet_init(void);
441
442extern void ipv6_packet_cleanup(void);
443
444extern int ip6_datagram_connect(struct sock *sk,
445 struct sockaddr *addr, int addr_len);
446
447extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
448extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
449 u32 info, u8 *payload);
450extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
451
452extern int inet6_release(struct socket *sock);
453extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
454 int addr_len);
455extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
456 int *uaddr_len, int peer);
457extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
458 unsigned long arg);
459
460/*
461 * reassembly.c
462 */
463extern int sysctl_ip6frag_high_thresh;
464extern int sysctl_ip6frag_low_thresh;
465extern int sysctl_ip6frag_time;
466extern int sysctl_ip6frag_secret_interval;
467
468#endif /* __KERNEL__ */
469#endif /* _NET_IPV6_H */
470
471
472