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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 | ||
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 | ||
20380731 | 107 | #include <linux/config.h> |
1da177e4 LT |
108 | #include <net/sock.h> |
109 | ||
110 | /* sysctls */ | |
111 | extern int sysctl_ipv6_bindv6only; | |
112 | extern int sysctl_mld_max_msf; | |
113 | ||
114 | /* MIBs */ | |
115 | DECLARE_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) | |
119 | DECLARE_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 | }) | |
145 | DECLARE_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 | |
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 */ | |
1da177e4 LT |
186 | struct ipv6_opt_hdr *dst1opt; |
187 | ||
188 | /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ | |
189 | }; | |
190 | ||
191 | struct 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 | ||
208 | struct ipv6_fl_socklist | |
209 | { | |
210 | struct ipv6_fl_socklist *next; | |
211 | struct ip6_flowlabel *fl; | |
212 | }; | |
213 | ||
214 | extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label); | |
215 | extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, | |
216 | struct ip6_flowlabel * fl, | |
217 | struct ipv6_txoptions * fopt); | |
218 | extern void fl6_free_socklist(struct sock *sk); | |
219 | extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); | |
220 | extern void ip6_flowlabel_init(void); | |
221 | extern void ip6_flowlabel_cleanup(void); | |
222 | ||
223 | static inline void fl6_sock_release(struct ip6_flowlabel *fl) | |
224 | { | |
225 | if (fl) | |
226 | atomic_dec(&fl->users); | |
227 | } | |
228 | ||
229 | extern int ip6_ra_control(struct sock *sk, int sel, | |
230 | void (*destructor)(struct sock *)); | |
231 | ||
232 | ||
233 | extern int ipv6_parse_hopopts(struct sk_buff *skb, int); | |
234 | ||
235 | extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); | |
333fad53 YH |
236 | extern 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); | |
1da177e4 LT |
240 | |
241 | extern int ip6_frag_nqueues; | |
242 | extern 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 | ||
250 | typedef int (*inet_getfrag_t) (const void *data, | |
251 | struct in6_addr *addr, | |
252 | char *, | |
253 | unsigned int, unsigned int); | |
254 | ||
255 | ||
256 | extern int ipv6_addr_type(const struct in6_addr *addr); | |
257 | ||
258 | static inline int ipv6_addr_scope(const struct in6_addr *addr) | |
259 | { | |
260 | return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; | |
261 | } | |
262 | ||
263 | static 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 | ||
268 | static 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 | ||
273 | static 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 | |
291 | static 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 | ||
302 | static 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 | ||
311 | static 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 | ||
329 | static 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 | ||
337 | static 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 | ||
351 | extern int ipv6_rcv(struct sk_buff *skb, | |
352 | struct net_device *dev, | |
f2ccd8fa DM |
353 | struct packet_type *pt, |
354 | struct net_device *orig_dev); | |
1da177e4 LT |
355 | |
356 | /* | |
357 | * upper-layer output functions | |
358 | */ | |
359 | extern int ip6_xmit(struct sock *sk, | |
360 | struct sk_buff *skb, | |
361 | struct flowi *fl, | |
362 | struct ipv6_txoptions *opt, | |
363 | int ipfragok); | |
364 | ||
365 | extern 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 | ||
372 | extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); | |
373 | ||
374 | extern 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 | struct ipv6_txoptions *opt, | |
381 | struct flowi *fl, | |
382 | struct rt6_info *rt, | |
383 | unsigned int flags); | |
384 | ||
385 | extern int ip6_push_pending_frames(struct sock *sk); | |
386 | ||
387 | extern void ip6_flush_pending_frames(struct sock *sk); | |
388 | ||
389 | extern int ip6_dst_lookup(struct sock *sk, | |
390 | struct dst_entry **dst, | |
391 | struct flowi *fl); | |
392 | ||
393 | /* | |
394 | * skb processing functions | |
395 | */ | |
396 | ||
397 | extern int ip6_output(struct sk_buff *skb); | |
398 | extern int ip6_forward(struct sk_buff *skb); | |
399 | extern int ip6_input(struct sk_buff *skb); | |
400 | extern int ip6_mc_input(struct sk_buff *skb); | |
401 | ||
402 | /* | |
403 | * Extension header (options) processing | |
404 | */ | |
405 | ||
406 | extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb, | |
407 | u8 *prev_hdr, | |
408 | struct ipv6_txoptions *opt, | |
409 | struct in6_addr *daddr, | |
410 | u32 jumbolen); | |
411 | extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, | |
412 | u8 *prev_hdr, | |
413 | struct ipv6_txoptions *opt); | |
414 | extern void ipv6_push_nfrag_opts(struct sk_buff *skb, | |
415 | struct ipv6_txoptions *opt, | |
416 | u8 *proto, | |
417 | struct in6_addr **daddr_p); | |
418 | extern void ipv6_push_frag_opts(struct sk_buff *skb, | |
419 | struct ipv6_txoptions *opt, | |
420 | u8 *proto); | |
421 | ||
422 | extern int ipv6_skip_exthdr(const struct sk_buff *, int start, | |
0d3d077c | 423 | u8 *nexthdrp); |
1da177e4 LT |
424 | |
425 | extern int ipv6_ext_hdr(u8 nexthdr); | |
426 | ||
427 | extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk, | |
428 | struct ipv6_rt_hdr *hdr); | |
429 | ||
430 | ||
431 | /* | |
432 | * socket options (ipv6_sockglue.c) | |
433 | */ | |
434 | ||
435 | extern int ipv6_setsockopt(struct sock *sk, int level, | |
436 | int optname, | |
437 | char __user *optval, | |
438 | int optlen); | |
439 | extern int ipv6_getsockopt(struct sock *sk, int level, | |
440 | int optname, | |
441 | char __user *optval, | |
442 | int __user *optlen); | |
443 | ||
444 | extern void ipv6_packet_init(void); | |
445 | ||
446 | extern void ipv6_packet_cleanup(void); | |
447 | ||
448 | extern int ip6_datagram_connect(struct sock *sk, | |
449 | struct sockaddr *addr, int addr_len); | |
450 | ||
451 | extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
452 | extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, | |
453 | u32 info, u8 *payload); | |
454 | extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); | |
455 | ||
456 | extern int inet6_release(struct socket *sock); | |
457 | extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, | |
458 | int addr_len); | |
459 | extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, | |
460 | int *uaddr_len, int peer); | |
461 | extern int inet6_ioctl(struct socket *sock, unsigned int cmd, | |
462 | unsigned long arg); | |
463 | ||
464 | /* | |
465 | * reassembly.c | |
466 | */ | |
467 | extern int sysctl_ip6frag_high_thresh; | |
468 | extern int sysctl_ip6frag_low_thresh; | |
469 | extern int sysctl_ip6frag_time; | |
470 | extern int sysctl_ip6frag_secret_interval; | |
471 | ||
20380731 ACM |
472 | extern struct proto_ops inet6_stream_ops; |
473 | extern struct proto_ops inet6_dgram_ops; | |
474 | ||
475 | extern int ip6_mc_source(int add, int omode, struct sock *sk, | |
476 | struct group_source_req *pgsr); | |
477 | extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); | |
478 | extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, | |
479 | struct group_filter __user *optval, | |
480 | int __user *optlen); | |
481 | ||
482 | #ifdef CONFIG_PROC_FS | |
483 | extern int ac6_proc_init(void); | |
484 | extern void ac6_proc_exit(void); | |
485 | extern int raw6_proc_init(void); | |
486 | extern void raw6_proc_exit(void); | |
487 | extern int tcp6_proc_init(void); | |
488 | extern void tcp6_proc_exit(void); | |
489 | extern int udp6_proc_init(void); | |
490 | extern void udp6_proc_exit(void); | |
491 | extern int ipv6_misc_proc_init(void); | |
492 | extern void ipv6_misc_proc_exit(void); | |
493 | ||
494 | extern struct rt6_statistics rt6_stats; | |
495 | #endif | |
1da177e4 | 496 | |
20380731 ACM |
497 | #ifdef CONFIG_SYSCTL |
498 | extern ctl_table ipv6_route_table[]; | |
499 | extern ctl_table ipv6_icmp_table[]; | |
1da177e4 | 500 | |
20380731 ACM |
501 | extern void ipv6_sysctl_register(void); |
502 | extern void ipv6_sysctl_unregister(void); | |
503 | #endif | |
1da177e4 | 504 | |
20380731 ACM |
505 | #endif /* __KERNEL__ */ |
506 | #endif /* _NET_IPV6_H */ |