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
96 struct 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 */
110 extern int sysctl_ipv6_bindv6only;
111 extern int sysctl_mld_max_msf;
112
113 /* MIBs */
114 DECLARE_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)
118 DECLARE_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 })
144 DECLARE_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)
148 extern atomic_t inet6_sock_nr;
149
150 int snmp6_register_dev(struct inet6_dev *idev);
151 int snmp6_unregister_dev(struct inet6_dev *idev);
152 int snmp6_alloc_dev(struct inet6_dev *idev);
153 int snmp6_free_dev(struct inet6_dev *idev);
154 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
155 void snmp6_mib_free(void *ptr[2]);
156
157 struct ip6_ra_chain
158 {
159 struct ip6_ra_chain *next;
160 struct sock *sk;
161 int sel;
162 void (*destructor)(struct sock *);
163 };
164
165 extern struct ip6_ra_chain *ip6_ra_chain;
166 extern 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
173 struct 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
192 struct 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
209 struct ipv6_fl_socklist
210 {
211 struct ipv6_fl_socklist *next;
212 struct ip6_flowlabel *fl;
213 };
214
215 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
216 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
217 struct ip6_flowlabel * fl,
218 struct ipv6_txoptions * fopt);
219 extern void fl6_free_socklist(struct sock *sk);
220 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
221 extern void ip6_flowlabel_init(void);
222 extern void ip6_flowlabel_cleanup(void);
223
224 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
225 {
226 if (fl)
227 atomic_dec(&fl->users);
228 }
229
230 extern int ip6_ra_control(struct sock *sk, int sel,
231 void (*destructor)(struct sock *));
232
233
234 extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
235
236 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
237
238 extern int ip6_frag_nqueues;
239 extern 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
247 typedef int (*inet_getfrag_t) (const void *data,
248 struct in6_addr *addr,
249 char *,
250 unsigned int, unsigned int);
251
252
253 extern int ipv6_addr_type(const struct in6_addr *addr);
254
255 static inline int ipv6_addr_scope(const struct in6_addr *addr)
256 {
257 return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
258 }
259
260 static 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
265 static 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
270 static 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
288 static 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
299 static 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
308 static inline int ipv6_addr_any(const struct in6_addr *a)
309 {
310 return ((a->s6_addr32[0] | a->s6_addr32[1] |
311 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
312 }
313
314 /*
315 * Prototypes exported by ipv6
316 */
317
318 /*
319 * rcv function (called from netdevice level)
320 */
321
322 extern int ipv6_rcv(struct sk_buff *skb,
323 struct net_device *dev,
324 struct packet_type *pt);
325
326 /*
327 * upper-layer output functions
328 */
329 extern int ip6_xmit(struct sock *sk,
330 struct sk_buff *skb,
331 struct flowi *fl,
332 struct ipv6_txoptions *opt,
333 int ipfragok);
334
335 extern int ip6_nd_hdr(struct sock *sk,
336 struct sk_buff *skb,
337 struct net_device *dev,
338 struct in6_addr *saddr,
339 struct in6_addr *daddr,
340 int proto, int len);
341
342 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
343
344 extern int ip6_append_data(struct sock *sk,
345 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
346 void *from,
347 int length,
348 int transhdrlen,
349 int hlimit,
350 struct ipv6_txoptions *opt,
351 struct flowi *fl,
352 struct rt6_info *rt,
353 unsigned int flags);
354
355 extern int ip6_push_pending_frames(struct sock *sk);
356
357 extern void ip6_flush_pending_frames(struct sock *sk);
358
359 extern int ip6_dst_lookup(struct sock *sk,
360 struct dst_entry **dst,
361 struct flowi *fl);
362
363 /*
364 * skb processing functions
365 */
366
367 extern int ip6_output(struct sk_buff *skb);
368 extern int ip6_forward(struct sk_buff *skb);
369 extern int ip6_input(struct sk_buff *skb);
370 extern int ip6_mc_input(struct sk_buff *skb);
371
372 /*
373 * Extension header (options) processing
374 */
375
376 extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
377 u8 *prev_hdr,
378 struct ipv6_txoptions *opt,
379 struct in6_addr *daddr,
380 u32 jumbolen);
381 extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
382 u8 *prev_hdr,
383 struct ipv6_txoptions *opt);
384 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
385 struct ipv6_txoptions *opt,
386 u8 *proto,
387 struct in6_addr **daddr_p);
388 extern void ipv6_push_frag_opts(struct sk_buff *skb,
389 struct ipv6_txoptions *opt,
390 u8 *proto);
391
392 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
393 u8 *nexthdrp, int len);
394
395 extern int ipv6_ext_hdr(u8 nexthdr);
396
397 extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
398 struct ipv6_rt_hdr *hdr);
399
400
401 /*
402 * socket options (ipv6_sockglue.c)
403 */
404
405 extern int ipv6_setsockopt(struct sock *sk, int level,
406 int optname,
407 char __user *optval,
408 int optlen);
409 extern int ipv6_getsockopt(struct sock *sk, int level,
410 int optname,
411 char __user *optval,
412 int __user *optlen);
413
414 extern void ipv6_packet_init(void);
415
416 extern void ipv6_packet_cleanup(void);
417
418 extern int ip6_datagram_connect(struct sock *sk,
419 struct sockaddr *addr, int addr_len);
420
421 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
422 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
423 u32 info, u8 *payload);
424 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
425
426 extern int inet6_release(struct socket *sock);
427 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
428 int addr_len);
429 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
430 int *uaddr_len, int peer);
431 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
432 unsigned long arg);
433
434 /*
435 * reassembly.c
436 */
437 extern int sysctl_ip6frag_high_thresh;
438 extern int sysctl_ip6frag_low_thresh;
439 extern int sysctl_ip6frag_time;
440 extern int sysctl_ip6frag_secret_interval;
441
442 #endif /* __KERNEL__ */
443 #endif /* _NET_IPV6_H */
444
445
446
447
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