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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 | ||
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 */ | |
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); | |
236 | ||
237 | extern int ip6_frag_nqueues; | |
238 | extern atomic_t ip6_frag_mem; | |
239 | ||
240 | #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */ | |
241 | ||
242 | /* | |
243 | * Function prototype for build_xmit | |
244 | */ | |
245 | ||
246 | typedef int (*inet_getfrag_t) (const void *data, | |
247 | struct in6_addr *addr, | |
248 | char *, | |
249 | unsigned int, unsigned int); | |
250 | ||
251 | ||
252 | extern int ipv6_addr_type(const struct in6_addr *addr); | |
253 | ||
254 | static inline int ipv6_addr_scope(const struct in6_addr *addr) | |
255 | { | |
256 | return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; | |
257 | } | |
258 | ||
259 | static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) | |
260 | { | |
261 | return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); | |
262 | } | |
263 | ||
264 | static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) | |
265 | { | |
266 | memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); | |
267 | } | |
268 | ||
269 | static inline void ipv6_addr_prefix(struct in6_addr *pfx, | |
270 | const struct in6_addr *addr, | |
271 | int plen) | |
272 | { | |
273 | /* caller must guarantee 0 <= plen <= 128 */ | |
274 | int o = plen >> 3, | |
275 | b = plen & 0x7; | |
276 | ||
277 | memcpy(pfx->s6_addr, addr, o); | |
278 | if (b != 0) { | |
279 | pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); | |
280 | o++; | |
281 | } | |
282 | if (o < 16) | |
283 | memset(pfx->s6_addr + o, 0, 16 - o); | |
284 | } | |
285 | ||
286 | #ifndef __HAVE_ARCH_ADDR_SET | |
287 | static inline void ipv6_addr_set(struct in6_addr *addr, | |
288 | __u32 w1, __u32 w2, | |
289 | __u32 w3, __u32 w4) | |
290 | { | |
291 | addr->s6_addr32[0] = w1; | |
292 | addr->s6_addr32[1] = w2; | |
293 | addr->s6_addr32[2] = w3; | |
294 | addr->s6_addr32[3] = w4; | |
295 | } | |
296 | #endif | |
297 | ||
298 | static inline int ipv6_addr_equal(const struct in6_addr *a1, | |
299 | const struct in6_addr *a2) | |
300 | { | |
301 | return (a1->s6_addr32[0] == a2->s6_addr32[0] && | |
302 | a1->s6_addr32[1] == a2->s6_addr32[1] && | |
303 | a1->s6_addr32[2] == a2->s6_addr32[2] && | |
304 | a1->s6_addr32[3] == a2->s6_addr32[3]); | |
305 | } | |
306 | ||
307 | static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, | |
308 | unsigned int prefixlen) | |
309 | { | |
310 | unsigned pdw, pbi; | |
311 | ||
312 | /* check complete u32 in prefix */ | |
313 | pdw = prefixlen >> 5; | |
314 | if (pdw && memcmp(a1, a2, pdw << 2)) | |
315 | return 0; | |
316 | ||
317 | /* check incomplete u32 in prefix */ | |
318 | pbi = prefixlen & 0x1f; | |
319 | if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) | |
320 | return 0; | |
321 | ||
322 | return 1; | |
323 | } | |
324 | ||
325 | static inline int ipv6_prefix_equal(const struct in6_addr *a1, | |
326 | const struct in6_addr *a2, | |
327 | unsigned int prefixlen) | |
328 | { | |
329 | return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, | |
330 | prefixlen); | |
331 | } | |
332 | ||
333 | static inline int ipv6_addr_any(const struct in6_addr *a) | |
334 | { | |
335 | return ((a->s6_addr32[0] | a->s6_addr32[1] | | |
336 | a->s6_addr32[2] | a->s6_addr32[3] ) == 0); | |
337 | } | |
338 | ||
339 | /* | |
340 | * Prototypes exported by ipv6 | |
341 | */ | |
342 | ||
343 | /* | |
344 | * rcv function (called from netdevice level) | |
345 | */ | |
346 | ||
347 | extern int ipv6_rcv(struct sk_buff *skb, | |
348 | struct net_device *dev, | |
f2ccd8fa DM |
349 | struct packet_type *pt, |
350 | struct net_device *orig_dev); | |
1da177e4 LT |
351 | |
352 | /* | |
353 | * upper-layer output functions | |
354 | */ | |
355 | extern int ip6_xmit(struct sock *sk, | |
356 | struct sk_buff *skb, | |
357 | struct flowi *fl, | |
358 | struct ipv6_txoptions *opt, | |
359 | int ipfragok); | |
360 | ||
361 | extern 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 | ||
368 | extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); | |
369 | ||
370 | extern 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 | ||
381 | extern int ip6_push_pending_frames(struct sock *sk); | |
382 | ||
383 | extern void ip6_flush_pending_frames(struct sock *sk); | |
384 | ||
385 | extern int ip6_dst_lookup(struct sock *sk, | |
386 | struct dst_entry **dst, | |
387 | struct flowi *fl); | |
388 | ||
389 | /* | |
390 | * skb processing functions | |
391 | */ | |
392 | ||
393 | extern int ip6_output(struct sk_buff *skb); | |
394 | extern int ip6_forward(struct sk_buff *skb); | |
395 | extern int ip6_input(struct sk_buff *skb); | |
396 | extern int ip6_mc_input(struct sk_buff *skb); | |
397 | ||
398 | /* | |
399 | * Extension header (options) processing | |
400 | */ | |
401 | ||
402 | extern 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); | |
407 | extern u8 * ipv6_build_frag_opts(struct sk_buff *skb, | |
408 | u8 *prev_hdr, | |
409 | struct ipv6_txoptions *opt); | |
410 | extern void ipv6_push_nfrag_opts(struct sk_buff *skb, | |
411 | struct ipv6_txoptions *opt, | |
412 | u8 *proto, | |
413 | struct in6_addr **daddr_p); | |
414 | extern void ipv6_push_frag_opts(struct sk_buff *skb, | |
415 | struct ipv6_txoptions *opt, | |
416 | u8 *proto); | |
417 | ||
418 | extern int ipv6_skip_exthdr(const struct sk_buff *, int start, | |
0d3d077c | 419 | u8 *nexthdrp); |
1da177e4 LT |
420 | |
421 | extern int ipv6_ext_hdr(u8 nexthdr); | |
422 | ||
423 | extern 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 | ||
431 | extern int ipv6_setsockopt(struct sock *sk, int level, | |
432 | int optname, | |
433 | char __user *optval, | |
434 | int optlen); | |
435 | extern int ipv6_getsockopt(struct sock *sk, int level, | |
436 | int optname, | |
437 | char __user *optval, | |
438 | int __user *optlen); | |
439 | ||
440 | extern void ipv6_packet_init(void); | |
441 | ||
442 | extern void ipv6_packet_cleanup(void); | |
443 | ||
444 | extern int ip6_datagram_connect(struct sock *sk, | |
445 | struct sockaddr *addr, int addr_len); | |
446 | ||
447 | extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); | |
448 | extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port, | |
449 | u32 info, u8 *payload); | |
450 | extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info); | |
451 | ||
452 | extern int inet6_release(struct socket *sock); | |
453 | extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, | |
454 | int addr_len); | |
455 | extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, | |
456 | int *uaddr_len, int peer); | |
457 | extern int inet6_ioctl(struct socket *sock, unsigned int cmd, | |
458 | unsigned long arg); | |
459 | ||
460 | /* | |
461 | * reassembly.c | |
462 | */ | |
463 | extern int sysctl_ip6frag_high_thresh; | |
464 | extern int sysctl_ip6frag_low_thresh; | |
465 | extern int sysctl_ip6frag_time; | |
466 | extern int sysctl_ip6frag_secret_interval; | |
467 | ||
468 | #endif /* __KERNEL__ */ | |
469 | #endif /* _NET_IPV6_H */ | |
470 | ||
471 | ||
472 |