1 /*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #ifndef _NET_IPV6_H
14 #define _NET_IPV6_H
15
16 #include <linux/ipv6.h>
17 #include <linux/hardirq.h>
18 #include <net/if_inet6.h>
19 #include <net/ndisc.h>
20 #include <net/flow.h>
21 #include <net/snmp.h>
22
23 #define SIN6_LEN_RFC2133 24
24
25 #define IPV6_MAXPLEN 65535
26
27 /*
28 * NextHeader field of IPv6 header
29 */
30
31 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
32 #define NEXTHDR_TCP 6 /* TCP segment. */
33 #define NEXTHDR_UDP 17 /* UDP message. */
34 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
35 #define NEXTHDR_ROUTING 43 /* Routing header. */
36 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
37 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
38 #define NEXTHDR_AUTH 51 /* Authentication header. */
39 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40 #define NEXTHDR_NONE 59 /* No next header */
41 #define NEXTHDR_DEST 60 /* Destination options header. */
42 #define NEXTHDR_MOBILITY 135 /* Mobility 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 __u8 nexthdr;
98 __u8 reserved;
99 __be16 frag_off;
100 __be32 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_mld_max_msf;
111 extern struct ctl_path net_ipv6_ctl_path[];
112
113 #define _DEVINC(net, statname, modifier, idev, field) \
114 ({ \
115 struct inet6_dev *_idev = (idev); \
116 if (likely(_idev != NULL)) \
117 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
118 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
119 })
120
121 #define _DEVADD(net, statname, modifier, idev, field, val) \
122 ({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
126 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
127 })
128
129 #define _DEVUPD(net, statname, modifier, idev, field, val) \
130 ({ \
131 struct inet6_dev *_idev = (idev); \
132 if (likely(_idev != NULL)) \
133 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
134 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
135 })
136
137 /* MIBs */
138
139 #define IP6_INC_STATS(net, idev,field) \
140 _DEVINC(net, ipv6, , idev, field)
141 #define IP6_INC_STATS_BH(net, idev,field) \
142 _DEVINC(net, ipv6, _BH, idev, field)
143 #define IP6_ADD_STATS(net, idev,field,val) \
144 _DEVADD(net, ipv6, , idev, field, val)
145 #define IP6_ADD_STATS_BH(net, idev,field,val) \
146 _DEVADD(net, ipv6, _BH, idev, field, val)
147 #define IP6_UPD_PO_STATS(net, idev,field,val) \
148 _DEVUPD(net, ipv6, , idev, field, val)
149 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
150 _DEVUPD(net, ipv6, _BH, idev, field, val)
151 #define ICMP6_INC_STATS(net, idev, field) \
152 _DEVINC(net, icmpv6, , idev, field)
153 #define ICMP6_INC_STATS_BH(net, idev, field) \
154 _DEVINC(net, icmpv6, _BH, idev, field)
155
156 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
157 _DEVINC(net, icmpv6msg, , idev, field +256)
158 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
159 _DEVINC(net, icmpv6msg, _BH, idev, field +256)
160 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
161 _DEVINC(net, icmpv6msg, _BH, idev, field)
162
163 struct ip6_ra_chain
164 {
165 struct ip6_ra_chain *next;
166 struct sock *sk;
167 int sel;
168 void (*destructor)(struct sock *);
169 };
170
171 extern struct ip6_ra_chain *ip6_ra_chain;
172 extern rwlock_t ip6_ra_lock;
173
174 /*
175 This structure is prepared by protocol, when parsing
176 ancillary data and passed to IPv6.
177 */
178
179 struct ipv6_txoptions
180 {
181 /* Length of this structure */
182 int tot_len;
183
184 /* length of extension headers */
185
186 __u16 opt_flen; /* after fragment hdr */
187 __u16 opt_nflen; /* before fragment hdr */
188
189 struct ipv6_opt_hdr *hopopt;
190 struct ipv6_opt_hdr *dst0opt;
191 struct ipv6_rt_hdr *srcrt; /* Routing Header */
192 struct ipv6_opt_hdr *dst1opt;
193
194 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
195 };
196
197 struct ip6_flowlabel
198 {
199 struct ip6_flowlabel *next;
200 __be32 label;
201 atomic_t users;
202 struct in6_addr dst;
203 struct ipv6_txoptions *opt;
204 unsigned long linger;
205 u8 share;
206 u32 owner;
207 unsigned long lastuse;
208 unsigned long expires;
209 struct net *fl_net;
210 };
211
212 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
213 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
214
215 struct ipv6_fl_socklist
216 {
217 struct ipv6_fl_socklist *next;
218 struct ip6_flowlabel *fl;
219 };
220
221 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
222 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
223 struct ip6_flowlabel * fl,
224 struct ipv6_txoptions * fopt);
225 extern void fl6_free_socklist(struct sock *sk);
226 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
227 extern int ip6_flowlabel_init(void);
228 extern void ip6_flowlabel_cleanup(void);
229
230 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
231 {
232 if (fl)
233 atomic_dec(&fl->users);
234 }
235
236 extern int ip6_ra_control(struct sock *sk, int sel);
237
238 extern int ipv6_parse_hopopts(struct sk_buff *skb);
239
240 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
241 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
242 int newtype,
243 struct ipv6_opt_hdr __user *newopt,
244 int newoptlen);
245 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
246 struct ipv6_txoptions *opt);
247
248 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
249
250 int ip6_frag_nqueues(struct net *net);
251 int ip6_frag_mem(struct net *net);
252
253 #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
254
255 extern int __ipv6_addr_type(const struct in6_addr *addr);
256 static inline int ipv6_addr_type(const struct in6_addr *addr)
257 {
258 return __ipv6_addr_type(addr) & 0xffff;
259 }
260
261 static inline int ipv6_addr_scope(const struct in6_addr *addr)
262 {
263 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
264 }
265
266 static inline int __ipv6_addr_src_scope(int type)
267 {
268 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
269 }
270
271 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
272 {
273 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
274 }
275
276 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
277 {
278 return memcmp(a1, a2, sizeof(struct in6_addr));
279 }
280
281 static inline int
282 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
283 const struct in6_addr *a2)
284 {
285 return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
286 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
287 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
288 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
289 }
290
291 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
292 {
293 memcpy(a1, a2, sizeof(struct in6_addr));
294 }
295
296 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
297 const struct in6_addr *addr,
298 int plen)
299 {
300 /* caller must guarantee 0 <= plen <= 128 */
301 int o = plen >> 3,
302 b = plen & 0x7;
303
304 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
305 memcpy(pfx->s6_addr, addr, o);
306 if (b != 0)
307 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
308 }
309
310 static inline void ipv6_addr_set(struct in6_addr *addr,
311 __be32 w1, __be32 w2,
312 __be32 w3, __be32 w4)
313 {
314 addr->s6_addr32[0] = w1;
315 addr->s6_addr32[1] = w2;
316 addr->s6_addr32[2] = w3;
317 addr->s6_addr32[3] = w4;
318 }
319
320 static inline int ipv6_addr_equal(const struct in6_addr *a1,
321 const struct in6_addr *a2)
322 {
323 return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
324 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
325 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
326 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
327 }
328
329 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
330 unsigned int prefixlen)
331 {
332 unsigned pdw, pbi;
333
334 /* check complete u32 in prefix */
335 pdw = prefixlen >> 5;
336 if (pdw && memcmp(a1, a2, pdw << 2))
337 return 0;
338
339 /* check incomplete u32 in prefix */
340 pbi = prefixlen & 0x1f;
341 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
342 return 0;
343
344 return 1;
345 }
346
347 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
348 const struct in6_addr *a2,
349 unsigned int prefixlen)
350 {
351 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
352 prefixlen);
353 }
354
355 struct inet_frag_queue;
356
357 enum ip6_defrag_users {
358 IP6_DEFRAG_LOCAL_DELIVER,
359 IP6_DEFRAG_CONNTRACK_IN,
360 IP6_DEFRAG_CONNTRACK_OUT,
361 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
362 };
363
364 struct ip6_create_arg {
365 __be32 id;
366 u32 user;
367 struct in6_addr *src;
368 struct in6_addr *dst;
369 };
370
371 void ip6_frag_init(struct inet_frag_queue *q, void *a);
372 int ip6_frag_match(struct inet_frag_queue *q, void *a);
373
374 static inline int ipv6_addr_any(const struct in6_addr *a)
375 {
376 return ((a->s6_addr32[0] | a->s6_addr32[1] |
377 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
378 }
379
380 static inline int ipv6_addr_loopback(const struct in6_addr *a)
381 {
382 return ((a->s6_addr32[0] | a->s6_addr32[1] |
383 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
384 }
385
386 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
387 {
388 return ((a->s6_addr32[0] | a->s6_addr32[1] |
389 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
390 }
391
392 /*
393 * Check for a RFC 4843 ORCHID address
394 * (Overlay Routable Cryptographic Hash Identifiers)
395 */
396 static inline int ipv6_addr_orchid(const struct in6_addr *a)
397 {
398 return ((a->s6_addr32[0] & htonl(0xfffffff0))
399 == htonl(0x20010010));
400 }
401
402 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
403 struct in6_addr *v4mapped)
404 {
405 ipv6_addr_set(v4mapped,
406 0, 0,
407 htonl(0x0000FFFF),
408 addr);
409 }
410
411 /*
412 * find the first different bit between two addresses
413 * length of address must be a multiple of 32bits
414 */
415 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
416 {
417 const __be32 *a1 = token1, *a2 = token2;
418 int i;
419
420 addrlen >>= 2;
421
422 for (i = 0; i < addrlen; i++) {
423 __be32 xb = a1[i] ^ a2[i];
424 if (xb)
425 return i * 32 + 32 - fls(ntohl(xb));
426 }
427
428 /*
429 * we should *never* get to this point since that
430 * would mean the addrs are equal
431 *
432 * However, we do get to it 8) And exacly, when
433 * addresses are equal 8)
434 *
435 * ip route add 1111::/128 via ...
436 * ip route add 1111::/64 via ...
437 * and we are here.
438 *
439 * Ideally, this function should stop comparison
440 * at prefix length. It does not, but it is still OK,
441 * if returned value is greater than prefix length.
442 * --ANK (980803)
443 */
444 return (addrlen << 5);
445 }
446
447 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
448 {
449 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
450 }
451
452 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
453
454 /*
455 * Prototypes exported by ipv6
456 */
457
458 /*
459 * rcv function (called from netdevice level)
460 */
461
462 extern int ipv6_rcv(struct sk_buff *skb,
463 struct net_device *dev,
464 struct packet_type *pt,
465 struct net_device *orig_dev);
466
467 extern int ip6_rcv_finish(struct sk_buff *skb);
468
469 /*
470 * upper-layer output functions
471 */
472 extern int ip6_xmit(struct sock *sk,
473 struct sk_buff *skb,
474 struct flowi *fl,
475 struct ipv6_txoptions *opt,
476 int ipfragok);
477
478 extern int ip6_nd_hdr(struct sock *sk,
479 struct sk_buff *skb,
480 struct net_device *dev,
481 const struct in6_addr *saddr,
482 const struct in6_addr *daddr,
483 int proto, int len);
484
485 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
486
487 extern int ip6_append_data(struct sock *sk,
488 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
489 void *from,
490 int length,
491 int transhdrlen,
492 int hlimit,
493 int tclass,
494 struct ipv6_txoptions *opt,
495 struct flowi *fl,
496 struct rt6_info *rt,
497 unsigned int flags);
498
499 extern int ip6_push_pending_frames(struct sock *sk);
500
501 extern void ip6_flush_pending_frames(struct sock *sk);
502
503 extern int ip6_dst_lookup(struct sock *sk,
504 struct dst_entry **dst,
505 struct flowi *fl);
506 extern int ip6_dst_blackhole(struct sock *sk,
507 struct dst_entry **dst,
508 struct flowi *fl);
509 extern int ip6_sk_dst_lookup(struct sock *sk,
510 struct dst_entry **dst,
511 struct flowi *fl);
512
513 /*
514 * skb processing functions
515 */
516
517 extern int ip6_output(struct sk_buff *skb);
518 extern int ip6_forward(struct sk_buff *skb);
519 extern int ip6_input(struct sk_buff *skb);
520 extern int ip6_mc_input(struct sk_buff *skb);
521
522 extern int __ip6_local_out(struct sk_buff *skb);
523 extern int ip6_local_out(struct sk_buff *skb);
524
525 /*
526 * Extension header (options) processing
527 */
528
529 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
530 struct ipv6_txoptions *opt,
531 u8 *proto,
532 struct in6_addr **daddr_p);
533 extern void ipv6_push_frag_opts(struct sk_buff *skb,
534 struct ipv6_txoptions *opt,
535 u8 *proto);
536
537 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
538 u8 *nexthdrp);
539
540 extern int ipv6_ext_hdr(u8 nexthdr);
541
542 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
543
544 /*
545 * socket options (ipv6_sockglue.c)
546 */
547
548 extern int ipv6_setsockopt(struct sock *sk, int level,
549 int optname,
550 char __user *optval,
551 unsigned int optlen);
552 extern int ipv6_getsockopt(struct sock *sk, int level,
553 int optname,
554 char __user *optval,
555 int __user *optlen);
556 extern int compat_ipv6_setsockopt(struct sock *sk,
557 int level,
558 int optname,
559 char __user *optval,
560 unsigned int optlen);
561 extern int compat_ipv6_getsockopt(struct sock *sk,
562 int level,
563 int optname,
564 char __user *optval,
565 int __user *optlen);
566
567 extern int ip6_datagram_connect(struct sock *sk,
568 struct sockaddr *addr, int addr_len);
569
570 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
571 int *addr_len);
572 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
573 u32 info, u8 *payload);
574 extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
575
576 extern int inet6_release(struct socket *sock);
577 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
578 int addr_len);
579 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
580 int *uaddr_len, int peer);
581 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
582 unsigned long arg);
583
584 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
585 struct sock *sk);
586
587 /*
588 * reassembly.c
589 */
590 extern const struct proto_ops inet6_stream_ops;
591 extern const struct proto_ops inet6_dgram_ops;
592
593 struct group_source_req;
594 struct group_filter;
595
596 extern int ip6_mc_source(int add, int omode, struct sock *sk,
597 struct group_source_req *pgsr);
598 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
599 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
600 struct group_filter __user *optval,
601 int __user *optlen);
602 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
603 const struct in6_addr *daddr, u32 rnd);
604
605 #ifdef CONFIG_PROC_FS
606 extern int ac6_proc_init(struct net *net);
607 extern void ac6_proc_exit(struct net *net);
608 extern int raw6_proc_init(void);
609 extern void raw6_proc_exit(void);
610 extern int tcp6_proc_init(struct net *net);
611 extern void tcp6_proc_exit(struct net *net);
612 extern int udp6_proc_init(struct net *net);
613 extern void udp6_proc_exit(struct net *net);
614 extern int udplite6_proc_init(void);
615 extern void udplite6_proc_exit(void);
616 extern int ipv6_misc_proc_init(void);
617 extern void ipv6_misc_proc_exit(void);
618 extern int snmp6_register_dev(struct inet6_dev *idev);
619 extern int snmp6_unregister_dev(struct inet6_dev *idev);
620
621 #else
622 static inline int ac6_proc_init(struct net *net) { return 0; }
623 static inline void ac6_proc_exit(struct net *net) { }
624 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
625 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
626 #endif
627
628 #ifdef CONFIG_SYSCTL
629 extern ctl_table ipv6_route_table_template[];
630 extern ctl_table ipv6_icmp_table_template[];
631
632 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
633 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
634 extern int ipv6_sysctl_register(void);
635 extern void ipv6_sysctl_unregister(void);
636 extern int ipv6_static_sysctl_register(void);
637 extern void ipv6_static_sysctl_unregister(void);
638 #endif
639
640 #endif /* __KERNEL__ */
641 #endif /* _NET_IPV6_H */
642
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