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clk: no need to check return value of debugfs_create functions
[linux-2.6/btrfs-unstable.git] / include / net / ipv6.h
blob836f31af1369b9c6967073eed66ce5a062e4f9c2
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 <linux/refcount.h>
20 #include <net/if_inet6.h>
21 #include <net/ndisc.h>
22 #include <net/flow.h>
23 #include <net/flow_dissector.h>
24 #include <net/snmp.h>
25 #include <net/netns/hash.h>
26
27 #define SIN6_LEN_RFC2133 24
28
29 #define IPV6_MAXPLEN 65535
30
31 /*
32 * NextHeader field of IPv6 header
33 */
34
35 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
36 #define NEXTHDR_TCP 6 /* TCP segment. */
37 #define NEXTHDR_UDP 17 /* UDP message. */
38 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
39 #define NEXTHDR_ROUTING 43 /* Routing header. */
40 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
41 #define NEXTHDR_GRE 47 /* GRE header. */
42 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
43 #define NEXTHDR_AUTH 51 /* Authentication header. */
44 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
45 #define NEXTHDR_NONE 59 /* No next header */
46 #define NEXTHDR_DEST 60 /* Destination options header. */
47 #define NEXTHDR_SCTP 132 /* SCTP message. */
48 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
49
50 #define NEXTHDR_MAX 255
51
52 #define IPV6_DEFAULT_HOPLIMIT 64
53 #define IPV6_DEFAULT_MCASTHOPS 1
54
55 /* Limits on Hop-by-Hop and Destination options.
56 *
57 * Per RFC8200 there is no limit on the maximum number or lengths of options in
58 * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
59 * We allow configurable limits in order to mitigate potential denial of
60 * service attacks.
61 *
62 * There are three limits that may be set:
63 * - Limit the number of options in a Hop-by-Hop or Destination options
64 * extension header
65 * - Limit the byte length of a Hop-by-Hop or Destination options extension
66 * header
67 * - Disallow unknown options
68 *
69 * The limits are expressed in corresponding sysctls:
70 *
71 * ipv6.sysctl.max_dst_opts_cnt
72 * ipv6.sysctl.max_hbh_opts_cnt
73 * ipv6.sysctl.max_dst_opts_len
74 * ipv6.sysctl.max_hbh_opts_len
75 *
76 * max_*_opts_cnt is the number of TLVs that are allowed for Destination
77 * options or Hop-by-Hop options. If the number is less than zero then unknown
78 * TLVs are disallowed and the number of known options that are allowed is the
79 * absolute value. Setting the value to INT_MAX indicates no limit.
80 *
81 * max_*_opts_len is the length limit in bytes of a Destination or
82 * Hop-by-Hop options extension header. Setting the value to INT_MAX
83 * indicates no length limit.
84 *
85 * If a limit is exceeded when processing an extension header the packet is
86 * silently discarded.
87 */
88
89 /* Default limits for Hop-by-Hop and Destination options */
90 #define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
91 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
92 #define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
93 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
94
95 /*
96 * Addr type
97 *
98 * type - unicast | multicast
99 * scope - local | site | global
100 * v4 - compat
101 * v4mapped
102 * any
103 * loopback
104 */
105
106 #define IPV6_ADDR_ANY 0x0000U
107
108 #define IPV6_ADDR_UNICAST 0x0001U
109 #define IPV6_ADDR_MULTICAST 0x0002U
110
111 #define IPV6_ADDR_LOOPBACK 0x0010U
112 #define IPV6_ADDR_LINKLOCAL 0x0020U
113 #define IPV6_ADDR_SITELOCAL 0x0040U
114
115 #define IPV6_ADDR_COMPATv4 0x0080U
116
117 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
118
119 #define IPV6_ADDR_MAPPED 0x1000U
120
121 /*
122 * Addr scopes
123 */
124 #define IPV6_ADDR_MC_SCOPE(a) \
125 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
126 #define __IPV6_ADDR_SCOPE_INVALID -1
127 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
128 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
129 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
130 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
131 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
132
133 /*
134 * Addr flags
135 */
136 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
137 ((a)->s6_addr[1] & 0x10)
138 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
139 ((a)->s6_addr[1] & 0x20)
140 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
141 ((a)->s6_addr[1] & 0x40)
142
143 /*
144 * fragmentation header
145 */
146
147 struct frag_hdr {
148 __u8 nexthdr;
149 __u8 reserved;
150 __be16 frag_off;
151 __be32 identification;
152 };
153
154 #define IP6_MF 0x0001
155 #define IP6_OFFSET 0xFFF8
156
157 #define IP6_REPLY_MARK(net, mark) \
158 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
159
160 #include <net/sock.h>
161
162 /* sysctls */
163 extern int sysctl_mld_max_msf;
164 extern int sysctl_mld_qrv;
165
166 #define _DEVINC(net, statname, mod, idev, field) \
167 ({ \
168 struct inet6_dev *_idev = (idev); \
169 if (likely(_idev != NULL)) \
170 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
171 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
172 })
173
174 /* per device counters are atomic_long_t */
175 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
176 ({ \
177 struct inet6_dev *_idev = (idev); \
178 if (likely(_idev != NULL)) \
179 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
180 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
181 })
182
183 /* per device and per net counters are atomic_long_t */
184 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
185 ({ \
186 struct inet6_dev *_idev = (idev); \
187 if (likely(_idev != NULL)) \
188 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
189 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
190 })
191
192 #define _DEVADD(net, statname, mod, idev, field, val) \
193 ({ \
194 struct inet6_dev *_idev = (idev); \
195 if (likely(_idev != NULL)) \
196 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
197 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
198 })
199
200 #define _DEVUPD(net, statname, mod, idev, field, val) \
201 ({ \
202 struct inet6_dev *_idev = (idev); \
203 if (likely(_idev != NULL)) \
204 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
205 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
206 })
207
208 /* MIBs */
209
210 #define IP6_INC_STATS(net, idev,field) \
211 _DEVINC(net, ipv6, , idev, field)
212 #define __IP6_INC_STATS(net, idev,field) \
213 _DEVINC(net, ipv6, __, idev, field)
214 #define IP6_ADD_STATS(net, idev,field,val) \
215 _DEVADD(net, ipv6, , idev, field, val)
216 #define __IP6_ADD_STATS(net, idev,field,val) \
217 _DEVADD(net, ipv6, __, idev, field, val)
218 #define IP6_UPD_PO_STATS(net, idev,field,val) \
219 _DEVUPD(net, ipv6, , idev, field, val)
220 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
221 _DEVUPD(net, ipv6, __, idev, field, val)
222 #define ICMP6_INC_STATS(net, idev, field) \
223 _DEVINCATOMIC(net, icmpv6, , idev, field)
224 #define __ICMP6_INC_STATS(net, idev, field) \
225 _DEVINCATOMIC(net, icmpv6, __, idev, field)
226
227 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
228 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
229 #define ICMP6MSGIN_INC_STATS(net, idev, field) \
230 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
231
232 struct ip6_ra_chain {
233 struct ip6_ra_chain *next;
234 struct sock *sk;
235 int sel;
236 void (*destructor)(struct sock *);
237 };
238
239 extern struct ip6_ra_chain *ip6_ra_chain;
240 extern rwlock_t ip6_ra_lock;
241
242 /*
243 This structure is prepared by protocol, when parsing
244 ancillary data and passed to IPv6.
245 */
246
247 struct ipv6_txoptions {
248 refcount_t refcnt;
249 /* Length of this structure */
250 int tot_len;
251
252 /* length of extension headers */
253
254 __u16 opt_flen; /* after fragment hdr */
255 __u16 opt_nflen; /* before fragment hdr */
256
257 struct ipv6_opt_hdr *hopopt;
258 struct ipv6_opt_hdr *dst0opt;
259 struct ipv6_rt_hdr *srcrt; /* Routing Header */
260 struct ipv6_opt_hdr *dst1opt;
261 struct rcu_head rcu;
262 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
263 };
264
265 struct ip6_flowlabel {
266 struct ip6_flowlabel __rcu *next;
267 __be32 label;
268 atomic_t users;
269 struct in6_addr dst;
270 struct ipv6_txoptions *opt;
271 unsigned long linger;
272 struct rcu_head rcu;
273 u8 share;
274 union {
275 struct pid *pid;
276 kuid_t uid;
277 } owner;
278 unsigned long lastuse;
279 unsigned long expires;
280 struct net *fl_net;
281 };
282
283 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
284 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
285 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
286
287 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
288 #define IPV6_TCLASS_SHIFT 20
289
290 struct ipv6_fl_socklist {
291 struct ipv6_fl_socklist __rcu *next;
292 struct ip6_flowlabel *fl;
293 struct rcu_head rcu;
294 };
295
296 struct ipcm6_cookie {
297 __s16 hlimit;
298 __s16 tclass;
299 __s8 dontfrag;
300 struct ipv6_txoptions *opt;
301 };
302
303 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
304 {
305 struct ipv6_txoptions *opt;
306
307 rcu_read_lock();
308 opt = rcu_dereference(np->opt);
309 if (opt) {
310 if (!refcount_inc_not_zero(&opt->refcnt))
311 opt = NULL;
312 else
313 opt = rcu_pointer_handoff(opt);
314 }
315 rcu_read_unlock();
316 return opt;
317 }
318
319 static inline void txopt_put(struct ipv6_txoptions *opt)
320 {
321 if (opt && refcount_dec_and_test(&opt->refcnt))
322 kfree_rcu(opt, rcu);
323 }
324
325 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
326 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
327 struct ip6_flowlabel *fl,
328 struct ipv6_txoptions *fopt);
329 void fl6_free_socklist(struct sock *sk);
330 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
331 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
332 int flags);
333 int ip6_flowlabel_init(void);
334 void ip6_flowlabel_cleanup(void);
335 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
336
337 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
338 {
339 if (fl)
340 atomic_dec(&fl->users);
341 }
342
343 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
344
345 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
346 struct icmp6hdr *thdr, int len);
347
348 int ip6_ra_control(struct sock *sk, int sel);
349
350 int ipv6_parse_hopopts(struct sk_buff *skb);
351
352 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
353 struct ipv6_txoptions *opt);
354 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
355 struct ipv6_txoptions *opt,
356 int newtype,
357 struct ipv6_opt_hdr __user *newopt,
358 int newoptlen);
359 struct ipv6_txoptions *
360 ipv6_renew_options_kern(struct sock *sk,
361 struct ipv6_txoptions *opt,
362 int newtype,
363 struct ipv6_opt_hdr *newopt,
364 int newoptlen);
365 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
366 struct ipv6_txoptions *opt);
367
368 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
369 const struct inet6_skb_parm *opt);
370 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
371 struct ipv6_txoptions *opt);
372
373 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
374 {
375 /* If forwarding is enabled, RA are not accepted unless the special
376 * hybrid mode (accept_ra=2) is enabled.
377 */
378 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
379 idev->cnf.accept_ra;
380 }
381
382 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
383 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
384 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
385
386 int __ipv6_addr_type(const struct in6_addr *addr);
387 static inline int ipv6_addr_type(const struct in6_addr *addr)
388 {
389 return __ipv6_addr_type(addr) & 0xffff;
390 }
391
392 static inline int ipv6_addr_scope(const struct in6_addr *addr)
393 {
394 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
395 }
396
397 static inline int __ipv6_addr_src_scope(int type)
398 {
399 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
400 }
401
402 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
403 {
404 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
405 }
406
407 static inline bool __ipv6_addr_needs_scope_id(int type)
408 {
409 return type & IPV6_ADDR_LINKLOCAL ||
410 (type & IPV6_ADDR_MULTICAST &&
411 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
412 }
413
414 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
415 {
416 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
417 }
418
419 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
420 {
421 return memcmp(a1, a2, sizeof(struct in6_addr));
422 }
423
424 static inline bool
425 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
426 const struct in6_addr *a2)
427 {
428 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
429 const unsigned long *ul1 = (const unsigned long *)a1;
430 const unsigned long *ulm = (const unsigned long *)m;
431 const unsigned long *ul2 = (const unsigned long *)a2;
432
433 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
434 ((ul1[1] ^ ul2[1]) & ulm[1]));
435 #else
436 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
437 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
438 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
439 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
440 #endif
441 }
442
443 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
444 const struct in6_addr *addr,
445 int plen)
446 {
447 /* caller must guarantee 0 <= plen <= 128 */
448 int o = plen >> 3,
449 b = plen & 0x7;
450
451 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
452 memcpy(pfx->s6_addr, addr, o);
453 if (b != 0)
454 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
455 }
456
457 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
458 const struct in6_addr *pfx,
459 int plen)
460 {
461 /* caller must guarantee 0 <= plen <= 128 */
462 int o = plen >> 3,
463 b = plen & 0x7;
464
465 memcpy(addr->s6_addr, pfx, o);
466 if (b != 0) {
467 addr->s6_addr[o] &= ~(0xff00 >> b);
468 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
469 }
470 }
471
472 static inline void __ipv6_addr_set_half(__be32 *addr,
473 __be32 wh, __be32 wl)
474 {
475 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
476 #if defined(__BIG_ENDIAN)
477 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
478 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
479 return;
480 }
481 #elif defined(__LITTLE_ENDIAN)
482 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
483 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
484 return;
485 }
486 #endif
487 #endif
488 addr[0] = wh;
489 addr[1] = wl;
490 }
491
492 static inline void ipv6_addr_set(struct in6_addr *addr,
493 __be32 w1, __be32 w2,
494 __be32 w3, __be32 w4)
495 {
496 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
497 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
498 }
499
500 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
501 const struct in6_addr *a2)
502 {
503 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
504 const unsigned long *ul1 = (const unsigned long *)a1;
505 const unsigned long *ul2 = (const unsigned long *)a2;
506
507 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
508 #else
509 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
510 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
511 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
512 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
513 #endif
514 }
515
516 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
517 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
518 const __be64 *a2,
519 unsigned int len)
520 {
521 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
522 return false;
523 return true;
524 }
525
526 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
527 const struct in6_addr *addr2,
528 unsigned int prefixlen)
529 {
530 const __be64 *a1 = (const __be64 *)addr1;
531 const __be64 *a2 = (const __be64 *)addr2;
532
533 if (prefixlen >= 64) {
534 if (a1[0] ^ a2[0])
535 return false;
536 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
537 }
538 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
539 }
540 #else
541 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
542 const struct in6_addr *addr2,
543 unsigned int prefixlen)
544 {
545 const __be32 *a1 = addr1->s6_addr32;
546 const __be32 *a2 = addr2->s6_addr32;
547 unsigned int pdw, pbi;
548
549 /* check complete u32 in prefix */
550 pdw = prefixlen >> 5;
551 if (pdw && memcmp(a1, a2, pdw << 2))
552 return false;
553
554 /* check incomplete u32 in prefix */
555 pbi = prefixlen & 0x1f;
556 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
557 return false;
558
559 return true;
560 }
561 #endif
562
563 struct inet_frag_queue;
564
565 enum ip6_defrag_users {
566 IP6_DEFRAG_LOCAL_DELIVER,
567 IP6_DEFRAG_CONNTRACK_IN,
568 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
569 IP6_DEFRAG_CONNTRACK_OUT,
570 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
571 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
572 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
573 };
574
575 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
576 extern const struct rhashtable_params ip6_rhash_params;
577
578 /*
579 * Equivalent of ipv4 struct ip
580 */
581 struct frag_queue {
582 struct inet_frag_queue q;
583
584 int iif;
585 __u16 nhoffset;
586 u8 ecn;
587 };
588
589 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq);
590
591 static inline bool ipv6_addr_any(const struct in6_addr *a)
592 {
593 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
594 const unsigned long *ul = (const unsigned long *)a;
595
596 return (ul[0] | ul[1]) == 0UL;
597 #else
598 return (a->s6_addr32[0] | a->s6_addr32[1] |
599 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
600 #endif
601 }
602
603 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
604 {
605 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
606 const unsigned long *ul = (const unsigned long *)a;
607 unsigned long x = ul[0] ^ ul[1];
608
609 return (u32)(x ^ (x >> 32));
610 #else
611 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
612 a->s6_addr32[2] ^ a->s6_addr32[3]);
613 #endif
614 }
615
616 /* more secured version of ipv6_addr_hash() */
617 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
618 {
619 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
620
621 return jhash_3words(v,
622 (__force u32)a->s6_addr32[2],
623 (__force u32)a->s6_addr32[3],
624 initval);
625 }
626
627 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
628 {
629 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
630 const __be64 *be = (const __be64 *)a;
631
632 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
633 #else
634 return (a->s6_addr32[0] | a->s6_addr32[1] |
635 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
636 #endif
637 }
638
639 /*
640 * Note that we must __force cast these to unsigned long to make sparse happy,
641 * since all of the endian-annotated types are fixed size regardless of arch.
642 */
643 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
644 {
645 return (
646 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
647 *(unsigned long *)a |
648 #else
649 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
650 #endif
651 (__force unsigned long)(a->s6_addr32[2] ^
652 cpu_to_be32(0x0000ffff))) == 0UL;
653 }
654
655 static inline u32 ipv6_portaddr_hash(const struct net *net,
656 const struct in6_addr *addr6,
657 unsigned int port)
658 {
659 unsigned int hash, mix = net_hash_mix(net);
660
661 if (ipv6_addr_any(addr6))
662 hash = jhash_1word(0, mix);
663 else if (ipv6_addr_v4mapped(addr6))
664 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
665 else
666 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
667
668 return hash ^ port;
669 }
670
671 /*
672 * Check for a RFC 4843 ORCHID address
673 * (Overlay Routable Cryptographic Hash Identifiers)
674 */
675 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
676 {
677 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
678 }
679
680 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
681 {
682 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
683 }
684
685 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
686 struct in6_addr *v4mapped)
687 {
688 ipv6_addr_set(v4mapped,
689 0, 0,
690 htonl(0x0000FFFF),
691 addr);
692 }
693
694 /*
695 * find the first different bit between two addresses
696 * length of address must be a multiple of 32bits
697 */
698 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
699 {
700 const __be32 *a1 = token1, *a2 = token2;
701 int i;
702
703 addrlen >>= 2;
704
705 for (i = 0; i < addrlen; i++) {
706 __be32 xb = a1[i] ^ a2[i];
707 if (xb)
708 return i * 32 + 31 - __fls(ntohl(xb));
709 }
710
711 /*
712 * we should *never* get to this point since that
713 * would mean the addrs are equal
714 *
715 * However, we do get to it 8) And exacly, when
716 * addresses are equal 8)
717 *
718 * ip route add 1111::/128 via ...
719 * ip route add 1111::/64 via ...
720 * and we are here.
721 *
722 * Ideally, this function should stop comparison
723 * at prefix length. It does not, but it is still OK,
724 * if returned value is greater than prefix length.
725 * --ANK (980803)
726 */
727 return addrlen << 5;
728 }
729
730 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
731 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
732 {
733 const __be64 *a1 = token1, *a2 = token2;
734 int i;
735
736 addrlen >>= 3;
737
738 for (i = 0; i < addrlen; i++) {
739 __be64 xb = a1[i] ^ a2[i];
740 if (xb)
741 return i * 64 + 63 - __fls(be64_to_cpu(xb));
742 }
743
744 return addrlen << 6;
745 }
746 #endif
747
748 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
749 {
750 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
751 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
752 return __ipv6_addr_diff64(token1, token2, addrlen);
753 #endif
754 return __ipv6_addr_diff32(token1, token2, addrlen);
755 }
756
757 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
758 {
759 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
760 }
761
762 __be32 ipv6_select_ident(struct net *net,
763 const struct in6_addr *daddr,
764 const struct in6_addr *saddr);
765 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
766
767 int ip6_dst_hoplimit(struct dst_entry *dst);
768
769 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
770 struct dst_entry *dst)
771 {
772 int hlimit;
773
774 if (ipv6_addr_is_multicast(&fl6->daddr))
775 hlimit = np->mcast_hops;
776 else
777 hlimit = np->hop_limit;
778 if (hlimit < 0)
779 hlimit = ip6_dst_hoplimit(dst);
780 return hlimit;
781 }
782
783 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
784 * Equivalent to : flow->v6addrs.src = iph->saddr;
785 * flow->v6addrs.dst = iph->daddr;
786 */
787 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
788 const struct ipv6hdr *iph)
789 {
790 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
791 offsetof(typeof(flow->addrs), v6addrs.src) +
792 sizeof(flow->addrs.v6addrs.src));
793 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
794 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
795 }
796
797 #if IS_ENABLED(CONFIG_IPV6)
798
799 /* Sysctl settings for net ipv6.auto_flowlabels */
800 #define IP6_AUTO_FLOW_LABEL_OFF 0
801 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
802 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
803 #define IP6_AUTO_FLOW_LABEL_FORCED 3
804
805 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
806
807 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
808
809 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
810 __be32 flowlabel, bool autolabel,
811 struct flowi6 *fl6)
812 {
813 u32 hash;
814
815 /* @flowlabel may include more than a flow label, eg, the traffic class.
816 * Here we want only the flow label value.
817 */
818 flowlabel &= IPV6_FLOWLABEL_MASK;
819
820 if (flowlabel ||
821 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
822 (!autolabel &&
823 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
824 return flowlabel;
825
826 hash = skb_get_hash_flowi6(skb, fl6);
827
828 /* Since this is being sent on the wire obfuscate hash a bit
829 * to minimize possbility that any useful information to an
830 * attacker is leaked. Only lower 20 bits are relevant.
831 */
832 rol32(hash, 16);
833
834 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
835
836 if (net->ipv6.sysctl.flowlabel_state_ranges)
837 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
838
839 return flowlabel;
840 }
841
842 static inline int ip6_default_np_autolabel(struct net *net)
843 {
844 switch (net->ipv6.sysctl.auto_flowlabels) {
845 case IP6_AUTO_FLOW_LABEL_OFF:
846 case IP6_AUTO_FLOW_LABEL_OPTIN:
847 default:
848 return 0;
849 case IP6_AUTO_FLOW_LABEL_OPTOUT:
850 case IP6_AUTO_FLOW_LABEL_FORCED:
851 return 1;
852 }
853 }
854 #else
855 static inline void ip6_set_txhash(struct sock *sk) { }
856 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
857 __be32 flowlabel, bool autolabel,
858 struct flowi6 *fl6)
859 {
860 return flowlabel;
861 }
862 static inline int ip6_default_np_autolabel(struct net *net)
863 {
864 return 0;
865 }
866 #endif
867
868 #if IS_ENABLED(CONFIG_IPV6)
869 static inline int ip6_multipath_hash_policy(const struct net *net)
870 {
871 return net->ipv6.sysctl.multipath_hash_policy;
872 }
873 #else
874 static inline int ip6_multipath_hash_policy(const struct net *net)
875 {
876 return 0;
877 }
878 #endif
879
880 /*
881 * Header manipulation
882 */
883 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
884 __be32 flowlabel)
885 {
886 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
887 }
888
889 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
890 {
891 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
892 }
893
894 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
895 {
896 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
897 }
898
899 static inline u8 ip6_tclass(__be32 flowinfo)
900 {
901 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
902 }
903
904 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
905 {
906 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
907 }
908
909 /*
910 * Prototypes exported by ipv6
911 */
912
913 /*
914 * rcv function (called from netdevice level)
915 */
916
917 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
918 struct packet_type *pt, struct net_device *orig_dev);
919
920 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
921
922 /*
923 * upper-layer output functions
924 */
925 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
926 __u32 mark, struct ipv6_txoptions *opt, int tclass);
927
928 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
929
930 int ip6_append_data(struct sock *sk,
931 int getfrag(void *from, char *to, int offset, int len,
932 int odd, struct sk_buff *skb),
933 void *from, int length, int transhdrlen,
934 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
935 struct rt6_info *rt, unsigned int flags,
936 const struct sockcm_cookie *sockc);
937
938 int ip6_push_pending_frames(struct sock *sk);
939
940 void ip6_flush_pending_frames(struct sock *sk);
941
942 int ip6_send_skb(struct sk_buff *skb);
943
944 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
945 struct inet_cork_full *cork,
946 struct inet6_cork *v6_cork);
947 struct sk_buff *ip6_make_skb(struct sock *sk,
948 int getfrag(void *from, char *to, int offset,
949 int len, int odd, struct sk_buff *skb),
950 void *from, int length, int transhdrlen,
951 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
952 struct rt6_info *rt, unsigned int flags,
953 const struct sockcm_cookie *sockc);
954
955 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
956 {
957 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
958 &inet6_sk(sk)->cork);
959 }
960
961 unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst);
962
963 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
964 struct flowi6 *fl6);
965 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
966 const struct in6_addr *final_dst);
967 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
968 const struct in6_addr *final_dst,
969 bool connected);
970 struct dst_entry *ip6_blackhole_route(struct net *net,
971 struct dst_entry *orig_dst);
972
973 /*
974 * skb processing functions
975 */
976
977 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
978 int ip6_forward(struct sk_buff *skb);
979 int ip6_input(struct sk_buff *skb);
980 int ip6_mc_input(struct sk_buff *skb);
981
982 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
983 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
984
985 /*
986 * Extension header (options) processing
987 */
988
989 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
990 u8 *proto, struct in6_addr **daddr_p,
991 struct in6_addr *saddr);
992 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
993 u8 *proto);
994
995 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
996 __be16 *frag_offp);
997
998 bool ipv6_ext_hdr(u8 nexthdr);
999
1000 enum {
1001 IP6_FH_F_FRAG = (1 << 0),
1002 IP6_FH_F_AUTH = (1 << 1),
1003 IP6_FH_F_SKIP_RH = (1 << 2),
1004 };
1005
1006 /* find specified header and get offset to it */
1007 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1008 unsigned short *fragoff, int *fragflg);
1009
1010 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1011
1012 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1013 const struct ipv6_txoptions *opt,
1014 struct in6_addr *orig);
1015
1016 /*
1017 * socket options (ipv6_sockglue.c)
1018 */
1019
1020 int ipv6_setsockopt(struct sock *sk, int level, int optname,
1021 char __user *optval, unsigned int optlen);
1022 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1023 char __user *optval, int __user *optlen);
1024 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
1025 char __user *optval, unsigned int optlen);
1026 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1027 char __user *optval, int __user *optlen);
1028
1029 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1030 int addr_len);
1031 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1032 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1033 int addr_len);
1034 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1035 void ip6_datagram_release_cb(struct sock *sk);
1036
1037 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1038 int *addr_len);
1039 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1040 int *addr_len);
1041 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1042 u32 info, u8 *payload);
1043 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1044 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1045
1046 int inet6_release(struct socket *sock);
1047 int __inet6_bind(struct sock *sock, struct sockaddr *uaddr, int addr_len,
1048 bool force_bind_address_no_port, bool with_lock);
1049 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1050 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1051 int peer);
1052 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1053
1054 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1055 struct sock *sk);
1056
1057 /*
1058 * reassembly.c
1059 */
1060 extern const struct proto_ops inet6_stream_ops;
1061 extern const struct proto_ops inet6_dgram_ops;
1062 extern const struct proto_ops inet6_sockraw_ops;
1063
1064 struct group_source_req;
1065 struct group_filter;
1066
1067 int ip6_mc_source(int add, int omode, struct sock *sk,
1068 struct group_source_req *pgsr);
1069 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1070 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1071 struct group_filter __user *optval, int __user *optlen);
1072
1073 #ifdef CONFIG_PROC_FS
1074 int ac6_proc_init(struct net *net);
1075 void ac6_proc_exit(struct net *net);
1076 int raw6_proc_init(void);
1077 void raw6_proc_exit(void);
1078 int tcp6_proc_init(struct net *net);
1079 void tcp6_proc_exit(struct net *net);
1080 int udp6_proc_init(struct net *net);
1081 void udp6_proc_exit(struct net *net);
1082 int udplite6_proc_init(void);
1083 void udplite6_proc_exit(void);
1084 int ipv6_misc_proc_init(void);
1085 void ipv6_misc_proc_exit(void);
1086 int snmp6_register_dev(struct inet6_dev *idev);
1087 int snmp6_unregister_dev(struct inet6_dev *idev);
1088
1089 #else
1090 static inline int ac6_proc_init(struct net *net) { return 0; }
1091 static inline void ac6_proc_exit(struct net *net) { }
1092 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1093 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1094 #endif
1095
1096 #ifdef CONFIG_SYSCTL
1097 extern struct ctl_table ipv6_route_table_template[];
1098
1099 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1100 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1101 int ipv6_sysctl_register(void);
1102 void ipv6_sysctl_unregister(void);
1103 #endif
1104
1105 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1106 const struct in6_addr *addr);
1107 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1108 const struct in6_addr *addr);
1109 #endif /* _NET_IPV6_H */
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