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 <linux/jhash.h>
19 #include <net/if_inet6.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 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
44
45 #define NEXTHDR_MAX 255
46
47
48
49 #define IPV6_DEFAULT_HOPLIMIT 64
50 #define IPV6_DEFAULT_MCASTHOPS 1
51
52 /*
53 * Addr type
54 *
55 * type - unicast | multicast
56 * scope - local | site | global
57 * v4 - compat
58 * v4mapped
59 * any
60 * loopback
61 */
62
63 #define IPV6_ADDR_ANY 0x0000U
64
65 #define IPV6_ADDR_UNICAST 0x0001U
66 #define IPV6_ADDR_MULTICAST 0x0002U
67
68 #define IPV6_ADDR_LOOPBACK 0x0010U
69 #define IPV6_ADDR_LINKLOCAL 0x0020U
70 #define IPV6_ADDR_SITELOCAL 0x0040U
71
72 #define IPV6_ADDR_COMPATv4 0x0080U
73
74 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
75
76 #define IPV6_ADDR_MAPPED 0x1000U
77
78 /*
79 * Addr scopes
80 */
81 #define IPV6_ADDR_MC_SCOPE(a) \
82 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
83 #define __IPV6_ADDR_SCOPE_INVALID -1
84 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
85 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
86 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
87 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
88 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
89
90 /*
91 * Addr flags
92 */
93 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
94 ((a)->s6_addr[1] & 0x10)
95 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
96 ((a)->s6_addr[1] & 0x20)
97 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
98 ((a)->s6_addr[1] & 0x40)
99
100 /*
101 * fragmentation header
102 */
103
104 struct frag_hdr {
105 __u8 nexthdr;
106 __u8 reserved;
107 __be16 frag_off;
108 __be32 identification;
109 };
110
111 #define IP6_MF 0x0001
112
113 #define IP6_REPLY_MARK(net, mark) \
114 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
115
116 #include <net/sock.h>
117
118 /* sysctls */
119 extern int sysctl_mld_max_msf;
120 extern struct ctl_path net_ipv6_ctl_path[];
121
122 #define _DEVINC(net, statname, modifier, idev, field) \
123 ({ \
124 struct inet6_dev *_idev = (idev); \
125 if (likely(_idev != NULL)) \
126 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
127 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
128 })
129
130 /* per device counters are atomic_long_t */
131 #define _DEVINCATOMIC(net, statname, modifier, idev, field) \
132 ({ \
133 struct inet6_dev *_idev = (idev); \
134 if (likely(_idev != NULL)) \
135 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
136 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
137 })
138
139 /* per device and per net counters are atomic_long_t */
140 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
141 ({ \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
145 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
146 })
147
148 #define _DEVADD(net, statname, modifier, idev, field, val) \
149 ({ \
150 struct inet6_dev *_idev = (idev); \
151 if (likely(_idev != NULL)) \
152 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
153 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
154 })
155
156 #define _DEVUPD(net, statname, modifier, idev, field, val) \
157 ({ \
158 struct inet6_dev *_idev = (idev); \
159 if (likely(_idev != NULL)) \
160 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
161 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
162 })
163
164 /* MIBs */
165
166 #define IP6_INC_STATS(net, idev,field) \
167 _DEVINC(net, ipv6, 64, idev, field)
168 #define IP6_INC_STATS_BH(net, idev,field) \
169 _DEVINC(net, ipv6, 64_BH, idev, field)
170 #define IP6_ADD_STATS(net, idev,field,val) \
171 _DEVADD(net, ipv6, 64, idev, field, val)
172 #define IP6_ADD_STATS_BH(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64_BH, idev, field, val)
174 #define IP6_UPD_PO_STATS(net, idev,field,val) \
175 _DEVUPD(net, ipv6, 64, idev, field, val)
176 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
178 #define ICMP6_INC_STATS(net, idev, field) \
179 _DEVINCATOMIC(net, icmpv6, , idev, field)
180 #define ICMP6_INC_STATS_BH(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
182
183 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
185 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
189
190 struct ip6_ra_chain {
191 struct ip6_ra_chain *next;
192 struct sock *sk;
193 int sel;
194 void (*destructor)(struct sock *);
195 };
196
197 extern struct ip6_ra_chain *ip6_ra_chain;
198 extern rwlock_t ip6_ra_lock;
199
200 /*
201 This structure is prepared by protocol, when parsing
202 ancillary data and passed to IPv6.
203 */
204
205 struct ipv6_txoptions {
206 atomic_t refcnt;
207 /* Length of this structure */
208 int tot_len;
209
210 /* length of extension headers */
211
212 __u16 opt_flen; /* after fragment hdr */
213 __u16 opt_nflen; /* before fragment hdr */
214
215 struct ipv6_opt_hdr *hopopt;
216 struct ipv6_opt_hdr *dst0opt;
217 struct ipv6_rt_hdr *srcrt; /* Routing Header */
218 struct ipv6_opt_hdr *dst1opt;
219 struct rcu_head rcu;
220 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
221 };
222
223 struct ip6_flowlabel {
224 struct ip6_flowlabel *next;
225 __be32 label;
226 atomic_t users;
227 struct in6_addr dst;
228 struct ipv6_txoptions *opt;
229 unsigned long linger;
230 u8 share;
231 u32 owner;
232 unsigned long lastuse;
233 unsigned long expires;
234 struct net *fl_net;
235 };
236
237 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
238 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
239
240 struct ipv6_fl_socklist {
241 struct ipv6_fl_socklist *next;
242 struct ip6_flowlabel *fl;
243 };
244
txopt_get(const struct ipv6_pinfo * np)245 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
246 {
247 struct ipv6_txoptions *opt;
248
249 rcu_read_lock();
250 opt = rcu_dereference(np->opt);
251 if (opt && !atomic_inc_not_zero(&opt->refcnt))
252 opt = NULL;
253 rcu_read_unlock();
254 return opt;
255 }
256
txopt_put(struct ipv6_txoptions * opt)257 static inline void txopt_put(struct ipv6_txoptions *opt)
258 {
259 if (opt && atomic_dec_and_test(&opt->refcnt))
260 kfree_rcu(opt, rcu);
261 }
262
263 extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
264 extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
265 struct ip6_flowlabel * fl,
266 struct ipv6_txoptions * fopt);
267 extern void fl6_free_socklist(struct sock *sk);
268 extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
269 extern int ip6_flowlabel_init(void);
270 extern void ip6_flowlabel_cleanup(void);
271
fl6_sock_release(struct ip6_flowlabel * fl)272 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
273 {
274 if (fl)
275 atomic_dec(&fl->users);
276 }
277
278 extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
279
280 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
281 struct icmp6hdr *thdr, int len);
282
283 struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
284 struct sock *sk, struct flowi6 *fl6);
285
286 extern int ip6_ra_control(struct sock *sk, int sel);
287
288 extern int ipv6_parse_hopopts(struct sk_buff *skb);
289
290 extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
291 extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
292 int newtype,
293 struct ipv6_opt_hdr __user *newopt,
294 int newoptlen);
295 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
296 struct ipv6_txoptions *opt);
297
298 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
299
300 int ip6_frag_nqueues(struct net *net);
301 int ip6_frag_mem(struct net *net);
302
303 #define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */
304 #define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */
305 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
306
307 extern int __ipv6_addr_type(const struct in6_addr *addr);
ipv6_addr_type(const struct in6_addr * addr)308 static inline int ipv6_addr_type(const struct in6_addr *addr)
309 {
310 return __ipv6_addr_type(addr) & 0xffff;
311 }
312
ipv6_addr_scope(const struct in6_addr * addr)313 static inline int ipv6_addr_scope(const struct in6_addr *addr)
314 {
315 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
316 }
317
__ipv6_addr_src_scope(int type)318 static inline int __ipv6_addr_src_scope(int type)
319 {
320 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
321 }
322
ipv6_addr_src_scope(const struct in6_addr * addr)323 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
324 {
325 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
326 }
327
__ipv6_addr_needs_scope_id(int type)328 static inline bool __ipv6_addr_needs_scope_id(int type)
329 {
330 return type & IPV6_ADDR_LINKLOCAL ||
331 (type & IPV6_ADDR_MULTICAST &&
332 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
333 }
334
ipv6_iface_scope_id(const struct in6_addr * addr,int iface)335 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
336 {
337 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
338 }
339
ipv6_addr_cmp(const struct in6_addr * a1,const struct in6_addr * a2)340 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
341 {
342 return memcmp(a1, a2, sizeof(struct in6_addr));
343 }
344
345 static inline int
ipv6_masked_addr_cmp(const struct in6_addr * a1,const struct in6_addr * m,const struct in6_addr * a2)346 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
347 const struct in6_addr *a2)
348 {
349 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
350 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
351 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
352 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
353 }
354
ipv6_addr_prefix(struct in6_addr * pfx,const struct in6_addr * addr,int plen)355 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
356 const struct in6_addr *addr,
357 int plen)
358 {
359 /* caller must guarantee 0 <= plen <= 128 */
360 int o = plen >> 3,
361 b = plen & 0x7;
362
363 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
364 memcpy(pfx->s6_addr, addr, o);
365 if (b != 0)
366 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
367 }
368
ipv6_addr_set(struct in6_addr * addr,__be32 w1,__be32 w2,__be32 w3,__be32 w4)369 static inline void ipv6_addr_set(struct in6_addr *addr,
370 __be32 w1, __be32 w2,
371 __be32 w3, __be32 w4)
372 {
373 addr->s6_addr32[0] = w1;
374 addr->s6_addr32[1] = w2;
375 addr->s6_addr32[2] = w3;
376 addr->s6_addr32[3] = w4;
377 }
378
ipv6_addr_equal(const struct in6_addr * a1,const struct in6_addr * a2)379 static inline int ipv6_addr_equal(const struct in6_addr *a1,
380 const struct in6_addr *a2)
381 {
382 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
383 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
384 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
385 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
386 }
387
__ipv6_prefix_equal(const __be32 * a1,const __be32 * a2,unsigned int prefixlen)388 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
389 unsigned int prefixlen)
390 {
391 unsigned pdw, pbi;
392
393 /* check complete u32 in prefix */
394 pdw = prefixlen >> 5;
395 if (pdw && memcmp(a1, a2, pdw << 2))
396 return 0;
397
398 /* check incomplete u32 in prefix */
399 pbi = prefixlen & 0x1f;
400 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
401 return 0;
402
403 return 1;
404 }
405
ipv6_prefix_equal(const struct in6_addr * a1,const struct in6_addr * a2,unsigned int prefixlen)406 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
407 const struct in6_addr *a2,
408 unsigned int prefixlen)
409 {
410 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
411 prefixlen);
412 }
413
414 struct inet_frag_queue;
415
416 enum ip6_defrag_users {
417 IP6_DEFRAG_LOCAL_DELIVER,
418 IP6_DEFRAG_CONNTRACK_IN,
419 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
420 IP6_DEFRAG_CONNTRACK_OUT,
421 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
422 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
423 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
424 };
425
426 struct ip6_create_arg {
427 __be32 id;
428 u32 user;
429 const struct in6_addr *src;
430 const struct in6_addr *dst;
431 };
432
433 void ip6_frag_init(struct inet_frag_queue *q, void *a);
434 int ip6_frag_match(struct inet_frag_queue *q, void *a);
435
436 /* more secured version of ipv6_addr_hash() */
ipv6_addr_jhash(const struct in6_addr * a)437 static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
438 {
439 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
440
441 return jhash_3words(v,
442 (__force u32)a->s6_addr32[2],
443 (__force u32)a->s6_addr32[3],
444 ipv6_hash_secret);
445 }
446
ipv6_addr_any(const struct in6_addr * a)447 static inline int ipv6_addr_any(const struct in6_addr *a)
448 {
449 return (a->s6_addr32[0] | a->s6_addr32[1] |
450 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
451 }
452
ipv6_addr_loopback(const struct in6_addr * a)453 static inline int ipv6_addr_loopback(const struct in6_addr *a)
454 {
455 return (a->s6_addr32[0] | a->s6_addr32[1] |
456 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
457 }
458
ipv6_addr_v4mapped(const struct in6_addr * a)459 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
460 {
461 return (a->s6_addr32[0] | a->s6_addr32[1] |
462 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
463 }
464
465 /*
466 * Check for a RFC 4843 ORCHID address
467 * (Overlay Routable Cryptographic Hash Identifiers)
468 */
ipv6_addr_orchid(const struct in6_addr * a)469 static inline int ipv6_addr_orchid(const struct in6_addr *a)
470 {
471 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
472 }
473
ipv6_addr_set_v4mapped(const __be32 addr,struct in6_addr * v4mapped)474 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
475 struct in6_addr *v4mapped)
476 {
477 ipv6_addr_set(v4mapped,
478 0, 0,
479 htonl(0x0000FFFF),
480 addr);
481 }
482
483 /*
484 * find the first different bit between two addresses
485 * length of address must be a multiple of 32bits
486 */
__ipv6_addr_diff(const void * token1,const void * token2,int addrlen)487 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
488 {
489 const __be32 *a1 = token1, *a2 = token2;
490 int i;
491
492 addrlen >>= 2;
493
494 for (i = 0; i < addrlen; i++) {
495 __be32 xb = a1[i] ^ a2[i];
496 if (xb)
497 return i * 32 + 31 - __fls(ntohl(xb));
498 }
499
500 /*
501 * we should *never* get to this point since that
502 * would mean the addrs are equal
503 *
504 * However, we do get to it 8) And exacly, when
505 * addresses are equal 8)
506 *
507 * ip route add 1111::/128 via ...
508 * ip route add 1111::/64 via ...
509 * and we are here.
510 *
511 * Ideally, this function should stop comparison
512 * at prefix length. It does not, but it is still OK,
513 * if returned value is greater than prefix length.
514 * --ANK (980803)
515 */
516 return addrlen << 5;
517 }
518
ipv6_addr_diff(const struct in6_addr * a1,const struct in6_addr * a2)519 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
520 {
521 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
522 }
523
524 extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
525
526 /*
527 * Prototypes exported by ipv6
528 */
529
530 /*
531 * rcv function (called from netdevice level)
532 */
533
534 extern int ipv6_rcv(struct sk_buff *skb,
535 struct net_device *dev,
536 struct packet_type *pt,
537 struct net_device *orig_dev);
538
539 extern int ip6_rcv_finish(struct sk_buff *skb);
540
541 /*
542 * upper-layer output functions
543 */
544 extern int ip6_xmit(struct sock *sk,
545 struct sk_buff *skb,
546 struct flowi6 *fl6,
547 struct ipv6_txoptions *opt,
548 int tclass);
549
550 extern int ip6_nd_hdr(struct sock *sk,
551 struct sk_buff *skb,
552 struct net_device *dev,
553 const struct in6_addr *saddr,
554 const struct in6_addr *daddr,
555 int proto, int len);
556
557 extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
558
559 extern int ip6_append_data(struct sock *sk,
560 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
561 void *from,
562 int length,
563 int transhdrlen,
564 int hlimit,
565 int tclass,
566 struct ipv6_txoptions *opt,
567 struct flowi6 *fl6,
568 struct rt6_info *rt,
569 unsigned int flags,
570 int dontfrag);
571
572 extern int ip6_push_pending_frames(struct sock *sk);
573
574 extern void ip6_flush_pending_frames(struct sock *sk);
575
576 extern int ip6_dst_lookup(struct sock *sk,
577 struct dst_entry **dst,
578 struct flowi6 *fl6);
579 extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
580 struct flowi6 *fl6,
581 const struct in6_addr *final_dst,
582 bool can_sleep);
583 extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
584 struct flowi6 *fl6,
585 const struct in6_addr *final_dst,
586 bool can_sleep);
587 extern struct dst_entry * ip6_blackhole_route(struct net *net,
588 struct dst_entry *orig_dst);
589
590 /*
591 * skb processing functions
592 */
593
594 extern int ip6_output(struct sk_buff *skb);
595 extern int ip6_forward(struct sk_buff *skb);
596 extern int ip6_input(struct sk_buff *skb);
597 extern int ip6_mc_input(struct sk_buff *skb);
598
599 extern int __ip6_local_out(struct sk_buff *skb);
600 extern int ip6_local_out(struct sk_buff *skb);
601
602 /*
603 * Extension header (options) processing
604 */
605
606 extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
607 struct ipv6_txoptions *opt,
608 u8 *proto,
609 struct in6_addr **daddr_p);
610 extern void ipv6_push_frag_opts(struct sk_buff *skb,
611 struct ipv6_txoptions *opt,
612 u8 *proto);
613
614 extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
615 u8 *nexthdrp, __be16 *frag_offp);
616
617 extern int ipv6_ext_hdr(u8 nexthdr);
618
619 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
620
621 extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
622 const struct ipv6_txoptions *opt,
623 struct in6_addr *orig);
624
625 /*
626 * socket options (ipv6_sockglue.c)
627 */
628
629 extern int ipv6_setsockopt(struct sock *sk, int level,
630 int optname,
631 char __user *optval,
632 unsigned int optlen);
633 extern int ipv6_getsockopt(struct sock *sk, int level,
634 int optname,
635 char __user *optval,
636 int __user *optlen);
637 extern int compat_ipv6_setsockopt(struct sock *sk,
638 int level,
639 int optname,
640 char __user *optval,
641 unsigned int optlen);
642 extern int compat_ipv6_getsockopt(struct sock *sk,
643 int level,
644 int optname,
645 char __user *optval,
646 int __user *optlen);
647
648 extern int ip6_datagram_connect(struct sock *sk,
649 struct sockaddr *addr, int addr_len);
650
651 extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
652 extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
653 extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
654 u32 info, u8 *payload);
655 extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
656 extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
657
658 extern int inet6_release(struct socket *sock);
659 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
660 int addr_len);
661 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
662 int *uaddr_len, int peer);
663 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
664 unsigned long arg);
665
666 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
667 struct sock *sk);
668
669 /*
670 * reassembly.c
671 */
672 extern const struct proto_ops inet6_stream_ops;
673 extern const struct proto_ops inet6_dgram_ops;
674
675 struct group_source_req;
676 struct group_filter;
677
678 extern int ip6_mc_source(int add, int omode, struct sock *sk,
679 struct group_source_req *pgsr);
680 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
681 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
682 struct group_filter __user *optval,
683 int __user *optlen);
684 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
685 const struct in6_addr *daddr, u32 rnd);
686
687 #ifdef CONFIG_PROC_FS
688 extern int ac6_proc_init(struct net *net);
689 extern void ac6_proc_exit(struct net *net);
690 extern int raw6_proc_init(void);
691 extern void raw6_proc_exit(void);
692 extern int tcp6_proc_init(struct net *net);
693 extern void tcp6_proc_exit(struct net *net);
694 extern int udp6_proc_init(struct net *net);
695 extern void udp6_proc_exit(struct net *net);
696 extern int udplite6_proc_init(void);
697 extern void udplite6_proc_exit(void);
698 extern int ipv6_misc_proc_init(void);
699 extern void ipv6_misc_proc_exit(void);
700 extern int snmp6_register_dev(struct inet6_dev *idev);
701 extern int snmp6_unregister_dev(struct inet6_dev *idev);
702
703 #else
ac6_proc_init(struct net * net)704 static inline int ac6_proc_init(struct net *net) { return 0; }
ac6_proc_exit(struct net * net)705 static inline void ac6_proc_exit(struct net *net) { }
snmp6_register_dev(struct inet6_dev * idev)706 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
snmp6_unregister_dev(struct inet6_dev * idev)707 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
708 #endif
709
710 #ifdef CONFIG_SYSCTL
711 extern ctl_table ipv6_route_table_template[];
712 extern ctl_table ipv6_icmp_table_template[];
713
714 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
715 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
716 extern int ipv6_sysctl_register(void);
717 extern void ipv6_sysctl_unregister(void);
718 extern int ipv6_static_sysctl_register(void);
719 extern void ipv6_static_sysctl_unregister(void);
720 #endif
721
722 #endif /* _NET_IPV6_H */
723