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[mirror_ubuntu-artful-kernel.git] / include / net / ipv6.h
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/flow_dissector.h>
23 #include <net/snmp.h>
24
25 #define SIN6_LEN_RFC2133 24
26
27 #define IPV6_MAXPLEN 65535
28
29 /*
30 * NextHeader field of IPv6 header
31 */
32
33 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
34 #define NEXTHDR_TCP 6 /* TCP segment. */
35 #define NEXTHDR_UDP 17 /* UDP message. */
36 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37 #define NEXTHDR_ROUTING 43 /* Routing header. */
38 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39 #define NEXTHDR_GRE 47 /* GRE header. */
40 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
41 #define NEXTHDR_AUTH 51 /* Authentication header. */
42 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
43 #define NEXTHDR_NONE 59 /* No next header */
44 #define NEXTHDR_DEST 60 /* Destination options header. */
45 #define NEXTHDR_SCTP 132 /* SCTP message. */
46 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
47
48 #define NEXTHDR_MAX 255
49
50 #define IPV6_DEFAULT_HOPLIMIT 64
51 #define IPV6_DEFAULT_MCASTHOPS 1
52
53 /*
54 * Addr type
55 *
56 * type - unicast | multicast
57 * scope - local | site | global
58 * v4 - compat
59 * v4mapped
60 * any
61 * loopback
62 */
63
64 #define IPV6_ADDR_ANY 0x0000U
65
66 #define IPV6_ADDR_UNICAST 0x0001U
67 #define IPV6_ADDR_MULTICAST 0x0002U
68
69 #define IPV6_ADDR_LOOPBACK 0x0010U
70 #define IPV6_ADDR_LINKLOCAL 0x0020U
71 #define IPV6_ADDR_SITELOCAL 0x0040U
72
73 #define IPV6_ADDR_COMPATv4 0x0080U
74
75 #define IPV6_ADDR_SCOPE_MASK 0x00f0U
76
77 #define IPV6_ADDR_MAPPED 0x1000U
78
79 /*
80 * Addr scopes
81 */
82 #define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84 #define __IPV6_ADDR_SCOPE_INVALID -1
85 #define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86 #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87 #define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88 #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89 #define IPV6_ADDR_SCOPE_GLOBAL 0x0e
90
91 /*
92 * Addr flags
93 */
94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
100
101 /*
102 * fragmentation header
103 */
104
105 struct frag_hdr {
106 __u8 nexthdr;
107 __u8 reserved;
108 __be16 frag_off;
109 __be32 identification;
110 };
111
112 #define IP6_MF 0x0001
113 #define IP6_OFFSET 0xFFF8
114
115 #define IP6_REPLY_MARK(net, mark) \
116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117
118 #include <net/sock.h>
119
120 /* sysctls */
121 extern int sysctl_mld_max_msf;
122 extern int sysctl_mld_qrv;
123
124 #define _DEVINC(net, statname, mod, idev, field) \
125 ({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
129 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
130 })
131
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
134 ({ \
135 struct inet6_dev *_idev = (idev); \
136 if (likely(_idev != NULL)) \
137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
139 })
140
141 /* per device and per net counters are atomic_long_t */
142 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
143 ({ \
144 struct inet6_dev *_idev = (idev); \
145 if (likely(_idev != NULL)) \
146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148 })
149
150 #define _DEVADD(net, statname, mod, idev, field, val) \
151 ({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
155 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
156 })
157
158 #define _DEVUPD(net, statname, mod, idev, field, val) \
159 ({ \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
163 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
164 })
165
166 /* MIBs */
167
168 #define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, , idev, field)
170 #define __IP6_INC_STATS(net, idev,field) \
171 _DEVINC(net, ipv6, __, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, , idev, field, val)
174 #define __IP6_ADD_STATS(net, idev,field,val) \
175 _DEVADD(net, ipv6, __, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, , idev, field, val)
178 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
179 _DEVUPD(net, ipv6, __, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define __ICMP6_INC_STATS(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, __, idev, field)
184
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS(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 __rcu *next;
225 __be32 label;
226 atomic_t users;
227 struct in6_addr dst;
228 struct ipv6_txoptions *opt;
229 unsigned long linger;
230 struct rcu_head rcu;
231 u8 share;
232 union {
233 struct pid *pid;
234 kuid_t uid;
235 } owner;
236 unsigned long lastuse;
237 unsigned long expires;
238 struct net *fl_net;
239 };
240
241 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
242 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
243 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
244
245 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246 #define IPV6_TCLASS_SHIFT 20
247
248 struct ipv6_fl_socklist {
249 struct ipv6_fl_socklist __rcu *next;
250 struct ip6_flowlabel *fl;
251 struct rcu_head rcu;
252 };
253
254 struct ipcm6_cookie {
255 __s16 hlimit;
256 __s16 tclass;
257 __s8 dontfrag;
258 struct ipv6_txoptions *opt;
259 };
260
261 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
262 {
263 struct ipv6_txoptions *opt;
264
265 rcu_read_lock();
266 opt = rcu_dereference(np->opt);
267 if (opt) {
268 if (!atomic_inc_not_zero(&opt->refcnt))
269 opt = NULL;
270 else
271 opt = rcu_pointer_handoff(opt);
272 }
273 rcu_read_unlock();
274 return opt;
275 }
276
277 static inline void txopt_put(struct ipv6_txoptions *opt)
278 {
279 if (opt && atomic_dec_and_test(&opt->refcnt))
280 kfree_rcu(opt, rcu);
281 }
282
283 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
284 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
285 struct ip6_flowlabel *fl,
286 struct ipv6_txoptions *fopt);
287 void fl6_free_socklist(struct sock *sk);
288 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
289 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
290 int flags);
291 int ip6_flowlabel_init(void);
292 void ip6_flowlabel_cleanup(void);
293
294 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
295 {
296 if (fl)
297 atomic_dec(&fl->users);
298 }
299
300 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
301
302 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
303 struct icmp6hdr *thdr, int len);
304
305 int ip6_ra_control(struct sock *sk, int sel);
306
307 int ipv6_parse_hopopts(struct sk_buff *skb);
308
309 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
310 struct ipv6_txoptions *opt);
311 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
312 struct ipv6_txoptions *opt,
313 int newtype,
314 struct ipv6_opt_hdr __user *newopt,
315 int newoptlen);
316 struct ipv6_txoptions *
317 ipv6_renew_options_kern(struct sock *sk,
318 struct ipv6_txoptions *opt,
319 int newtype,
320 struct ipv6_opt_hdr *newopt,
321 int newoptlen);
322 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
323 struct ipv6_txoptions *opt);
324
325 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
326 const struct inet6_skb_parm *opt);
327 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
328 struct ipv6_txoptions *opt);
329
330 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
331 {
332 /* If forwarding is enabled, RA are not accepted unless the special
333 * hybrid mode (accept_ra=2) is enabled.
334 */
335 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
336 idev->cnf.accept_ra;
337 }
338
339 #if IS_ENABLED(CONFIG_IPV6)
340 static inline int ip6_frag_mem(struct net *net)
341 {
342 return sum_frag_mem_limit(&net->ipv6.frags);
343 }
344 #endif
345
346 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
347 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
348 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
349
350 int __ipv6_addr_type(const struct in6_addr *addr);
351 static inline int ipv6_addr_type(const struct in6_addr *addr)
352 {
353 return __ipv6_addr_type(addr) & 0xffff;
354 }
355
356 static inline int ipv6_addr_scope(const struct in6_addr *addr)
357 {
358 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
359 }
360
361 static inline int __ipv6_addr_src_scope(int type)
362 {
363 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
364 }
365
366 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
367 {
368 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
369 }
370
371 static inline bool __ipv6_addr_needs_scope_id(int type)
372 {
373 return type & IPV6_ADDR_LINKLOCAL ||
374 (type & IPV6_ADDR_MULTICAST &&
375 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
376 }
377
378 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
379 {
380 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
381 }
382
383 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
384 {
385 return memcmp(a1, a2, sizeof(struct in6_addr));
386 }
387
388 static inline bool
389 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
390 const struct in6_addr *a2)
391 {
392 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
393 const unsigned long *ul1 = (const unsigned long *)a1;
394 const unsigned long *ulm = (const unsigned long *)m;
395 const unsigned long *ul2 = (const unsigned long *)a2;
396
397 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
398 ((ul1[1] ^ ul2[1]) & ulm[1]));
399 #else
400 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
401 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
402 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
403 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
404 #endif
405 }
406
407 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
408 const struct in6_addr *addr,
409 int plen)
410 {
411 /* caller must guarantee 0 <= plen <= 128 */
412 int o = plen >> 3,
413 b = plen & 0x7;
414
415 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
416 memcpy(pfx->s6_addr, addr, o);
417 if (b != 0)
418 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
419 }
420
421 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
422 const struct in6_addr *pfx,
423 int plen)
424 {
425 /* caller must guarantee 0 <= plen <= 128 */
426 int o = plen >> 3,
427 b = plen & 0x7;
428
429 memcpy(addr->s6_addr, pfx, o);
430 if (b != 0) {
431 addr->s6_addr[o] &= ~(0xff00 >> b);
432 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
433 }
434 }
435
436 static inline void __ipv6_addr_set_half(__be32 *addr,
437 __be32 wh, __be32 wl)
438 {
439 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
440 #if defined(__BIG_ENDIAN)
441 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
442 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
443 return;
444 }
445 #elif defined(__LITTLE_ENDIAN)
446 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
447 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
448 return;
449 }
450 #endif
451 #endif
452 addr[0] = wh;
453 addr[1] = wl;
454 }
455
456 static inline void ipv6_addr_set(struct in6_addr *addr,
457 __be32 w1, __be32 w2,
458 __be32 w3, __be32 w4)
459 {
460 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
461 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
462 }
463
464 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
465 const struct in6_addr *a2)
466 {
467 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468 const unsigned long *ul1 = (const unsigned long *)a1;
469 const unsigned long *ul2 = (const unsigned long *)a2;
470
471 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
472 #else
473 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
474 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
475 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
476 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
477 #endif
478 }
479
480 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
481 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
482 const __be64 *a2,
483 unsigned int len)
484 {
485 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
486 return false;
487 return true;
488 }
489
490 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
491 const struct in6_addr *addr2,
492 unsigned int prefixlen)
493 {
494 const __be64 *a1 = (const __be64 *)addr1;
495 const __be64 *a2 = (const __be64 *)addr2;
496
497 if (prefixlen >= 64) {
498 if (a1[0] ^ a2[0])
499 return false;
500 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
501 }
502 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
503 }
504 #else
505 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
506 const struct in6_addr *addr2,
507 unsigned int prefixlen)
508 {
509 const __be32 *a1 = addr1->s6_addr32;
510 const __be32 *a2 = addr2->s6_addr32;
511 unsigned int pdw, pbi;
512
513 /* check complete u32 in prefix */
514 pdw = prefixlen >> 5;
515 if (pdw && memcmp(a1, a2, pdw << 2))
516 return false;
517
518 /* check incomplete u32 in prefix */
519 pbi = prefixlen & 0x1f;
520 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
521 return false;
522
523 return true;
524 }
525 #endif
526
527 struct inet_frag_queue;
528
529 enum ip6_defrag_users {
530 IP6_DEFRAG_LOCAL_DELIVER,
531 IP6_DEFRAG_CONNTRACK_IN,
532 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
533 IP6_DEFRAG_CONNTRACK_OUT,
534 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
535 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
536 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
537 };
538
539 struct ip6_create_arg {
540 __be32 id;
541 u32 user;
542 const struct in6_addr *src;
543 const struct in6_addr *dst;
544 int iif;
545 u8 ecn;
546 };
547
548 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
549 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
550
551 /*
552 * Equivalent of ipv4 struct ip
553 */
554 struct frag_queue {
555 struct inet_frag_queue q;
556
557 __be32 id; /* fragment id */
558 u32 user;
559 struct in6_addr saddr;
560 struct in6_addr daddr;
561
562 int iif;
563 unsigned int csum;
564 __u16 nhoffset;
565 u8 ecn;
566 };
567
568 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
569 struct inet_frags *frags);
570
571 static inline bool ipv6_addr_any(const struct in6_addr *a)
572 {
573 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
574 const unsigned long *ul = (const unsigned long *)a;
575
576 return (ul[0] | ul[1]) == 0UL;
577 #else
578 return (a->s6_addr32[0] | a->s6_addr32[1] |
579 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
580 #endif
581 }
582
583 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
584 {
585 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
586 const unsigned long *ul = (const unsigned long *)a;
587 unsigned long x = ul[0] ^ ul[1];
588
589 return (u32)(x ^ (x >> 32));
590 #else
591 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
592 a->s6_addr32[2] ^ a->s6_addr32[3]);
593 #endif
594 }
595
596 /* more secured version of ipv6_addr_hash() */
597 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
598 {
599 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
600
601 return jhash_3words(v,
602 (__force u32)a->s6_addr32[2],
603 (__force u32)a->s6_addr32[3],
604 initval);
605 }
606
607 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
608 {
609 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
610 const __be64 *be = (const __be64 *)a;
611
612 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
613 #else
614 return (a->s6_addr32[0] | a->s6_addr32[1] |
615 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
616 #endif
617 }
618
619 /*
620 * Note that we must __force cast these to unsigned long to make sparse happy,
621 * since all of the endian-annotated types are fixed size regardless of arch.
622 */
623 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
624 {
625 return (
626 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627 *(unsigned long *)a |
628 #else
629 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
630 #endif
631 (__force unsigned long)(a->s6_addr32[2] ^
632 cpu_to_be32(0x0000ffff))) == 0UL;
633 }
634
635 /*
636 * Check for a RFC 4843 ORCHID address
637 * (Overlay Routable Cryptographic Hash Identifiers)
638 */
639 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
640 {
641 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
642 }
643
644 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
645 {
646 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
647 }
648
649 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
650 struct in6_addr *v4mapped)
651 {
652 ipv6_addr_set(v4mapped,
653 0, 0,
654 htonl(0x0000FFFF),
655 addr);
656 }
657
658 /*
659 * find the first different bit between two addresses
660 * length of address must be a multiple of 32bits
661 */
662 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
663 {
664 const __be32 *a1 = token1, *a2 = token2;
665 int i;
666
667 addrlen >>= 2;
668
669 for (i = 0; i < addrlen; i++) {
670 __be32 xb = a1[i] ^ a2[i];
671 if (xb)
672 return i * 32 + 31 - __fls(ntohl(xb));
673 }
674
675 /*
676 * we should *never* get to this point since that
677 * would mean the addrs are equal
678 *
679 * However, we do get to it 8) And exacly, when
680 * addresses are equal 8)
681 *
682 * ip route add 1111::/128 via ...
683 * ip route add 1111::/64 via ...
684 * and we are here.
685 *
686 * Ideally, this function should stop comparison
687 * at prefix length. It does not, but it is still OK,
688 * if returned value is greater than prefix length.
689 * --ANK (980803)
690 */
691 return addrlen << 5;
692 }
693
694 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
695 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
696 {
697 const __be64 *a1 = token1, *a2 = token2;
698 int i;
699
700 addrlen >>= 3;
701
702 for (i = 0; i < addrlen; i++) {
703 __be64 xb = a1[i] ^ a2[i];
704 if (xb)
705 return i * 64 + 63 - __fls(be64_to_cpu(xb));
706 }
707
708 return addrlen << 6;
709 }
710 #endif
711
712 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
713 {
714 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
715 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
716 return __ipv6_addr_diff64(token1, token2, addrlen);
717 #endif
718 return __ipv6_addr_diff32(token1, token2, addrlen);
719 }
720
721 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
722 {
723 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
724 }
725
726 __be32 ipv6_select_ident(struct net *net,
727 const struct in6_addr *daddr,
728 const struct in6_addr *saddr);
729 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
730
731 int ip6_dst_hoplimit(struct dst_entry *dst);
732
733 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
734 struct dst_entry *dst)
735 {
736 int hlimit;
737
738 if (ipv6_addr_is_multicast(&fl6->daddr))
739 hlimit = np->mcast_hops;
740 else
741 hlimit = np->hop_limit;
742 if (hlimit < 0)
743 hlimit = ip6_dst_hoplimit(dst);
744 return hlimit;
745 }
746
747 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
748 * Equivalent to : flow->v6addrs.src = iph->saddr;
749 * flow->v6addrs.dst = iph->daddr;
750 */
751 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
752 const struct ipv6hdr *iph)
753 {
754 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
755 offsetof(typeof(flow->addrs), v6addrs.src) +
756 sizeof(flow->addrs.v6addrs.src));
757 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
758 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
759 }
760
761 #if IS_ENABLED(CONFIG_IPV6)
762
763 /* Sysctl settings for net ipv6.auto_flowlabels */
764 #define IP6_AUTO_FLOW_LABEL_OFF 0
765 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
766 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
767 #define IP6_AUTO_FLOW_LABEL_FORCED 3
768
769 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
770
771 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
772
773 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
774 __be32 flowlabel, bool autolabel,
775 struct flowi6 *fl6)
776 {
777 u32 hash;
778
779 /* @flowlabel may include more than a flow label, eg, the traffic class.
780 * Here we want only the flow label value.
781 */
782 flowlabel &= IPV6_FLOWLABEL_MASK;
783
784 if (flowlabel ||
785 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
786 (!autolabel &&
787 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
788 return flowlabel;
789
790 hash = skb_get_hash_flowi6(skb, fl6);
791
792 /* Since this is being sent on the wire obfuscate hash a bit
793 * to minimize possbility that any useful information to an
794 * attacker is leaked. Only lower 20 bits are relevant.
795 */
796 rol32(hash, 16);
797
798 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
799
800 if (net->ipv6.sysctl.flowlabel_state_ranges)
801 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
802
803 return flowlabel;
804 }
805
806 static inline int ip6_default_np_autolabel(struct net *net)
807 {
808 switch (net->ipv6.sysctl.auto_flowlabels) {
809 case IP6_AUTO_FLOW_LABEL_OFF:
810 case IP6_AUTO_FLOW_LABEL_OPTIN:
811 default:
812 return 0;
813 case IP6_AUTO_FLOW_LABEL_OPTOUT:
814 case IP6_AUTO_FLOW_LABEL_FORCED:
815 return 1;
816 }
817 }
818 #else
819 static inline void ip6_set_txhash(struct sock *sk) { }
820 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
821 __be32 flowlabel, bool autolabel,
822 struct flowi6 *fl6)
823 {
824 return flowlabel;
825 }
826 static inline int ip6_default_np_autolabel(struct net *net)
827 {
828 return 0;
829 }
830 #endif
831
832
833 /*
834 * Header manipulation
835 */
836 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
837 __be32 flowlabel)
838 {
839 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
840 }
841
842 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
843 {
844 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
845 }
846
847 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
848 {
849 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
850 }
851
852 static inline u8 ip6_tclass(__be32 flowinfo)
853 {
854 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
855 }
856
857 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
858 {
859 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
860 }
861
862 /*
863 * Prototypes exported by ipv6
864 */
865
866 /*
867 * rcv function (called from netdevice level)
868 */
869
870 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
871 struct packet_type *pt, struct net_device *orig_dev);
872
873 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
874
875 /*
876 * upper-layer output functions
877 */
878 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
879 __u32 mark, struct ipv6_txoptions *opt, int tclass);
880
881 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
882
883 int ip6_append_data(struct sock *sk,
884 int getfrag(void *from, char *to, int offset, int len,
885 int odd, struct sk_buff *skb),
886 void *from, int length, int transhdrlen,
887 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
888 struct rt6_info *rt, unsigned int flags,
889 const struct sockcm_cookie *sockc);
890
891 int ip6_push_pending_frames(struct sock *sk);
892
893 void ip6_flush_pending_frames(struct sock *sk);
894
895 int ip6_send_skb(struct sk_buff *skb);
896
897 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
898 struct inet_cork_full *cork,
899 struct inet6_cork *v6_cork);
900 struct sk_buff *ip6_make_skb(struct sock *sk,
901 int getfrag(void *from, char *to, int offset,
902 int len, int odd, struct sk_buff *skb),
903 void *from, int length, int transhdrlen,
904 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
905 struct rt6_info *rt, unsigned int flags,
906 const struct sockcm_cookie *sockc);
907
908 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
909 {
910 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
911 &inet6_sk(sk)->cork);
912 }
913
914 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
915 struct flowi6 *fl6);
916 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
917 const struct in6_addr *final_dst);
918 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
919 const struct in6_addr *final_dst);
920 struct dst_entry *ip6_blackhole_route(struct net *net,
921 struct dst_entry *orig_dst);
922
923 /*
924 * skb processing functions
925 */
926
927 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
928 int ip6_forward(struct sk_buff *skb);
929 int ip6_input(struct sk_buff *skb);
930 int ip6_mc_input(struct sk_buff *skb);
931
932 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
933 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
934
935 /*
936 * Extension header (options) processing
937 */
938
939 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
940 u8 *proto, struct in6_addr **daddr_p,
941 struct in6_addr *saddr);
942 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
943 u8 *proto);
944
945 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
946 __be16 *frag_offp);
947
948 bool ipv6_ext_hdr(u8 nexthdr);
949
950 enum {
951 IP6_FH_F_FRAG = (1 << 0),
952 IP6_FH_F_AUTH = (1 << 1),
953 IP6_FH_F_SKIP_RH = (1 << 2),
954 };
955
956 /* find specified header and get offset to it */
957 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
958 unsigned short *fragoff, int *fragflg);
959
960 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
961
962 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
963 const struct ipv6_txoptions *opt,
964 struct in6_addr *orig);
965
966 /*
967 * socket options (ipv6_sockglue.c)
968 */
969
970 int ipv6_setsockopt(struct sock *sk, int level, int optname,
971 char __user *optval, unsigned int optlen);
972 int ipv6_getsockopt(struct sock *sk, int level, int optname,
973 char __user *optval, int __user *optlen);
974 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
975 char __user *optval, unsigned int optlen);
976 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
977 char __user *optval, int __user *optlen);
978
979 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
980 int addr_len);
981 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
982 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
983 int addr_len);
984 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
985 void ip6_datagram_release_cb(struct sock *sk);
986
987 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
988 int *addr_len);
989 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
990 int *addr_len);
991 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
992 u32 info, u8 *payload);
993 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
994 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
995
996 int inet6_release(struct socket *sock);
997 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
998 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
999 int peer);
1000 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1001
1002 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1003 struct sock *sk);
1004
1005 /*
1006 * reassembly.c
1007 */
1008 extern const struct proto_ops inet6_stream_ops;
1009 extern const struct proto_ops inet6_dgram_ops;
1010
1011 struct group_source_req;
1012 struct group_filter;
1013
1014 int ip6_mc_source(int add, int omode, struct sock *sk,
1015 struct group_source_req *pgsr);
1016 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1017 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1018 struct group_filter __user *optval, int __user *optlen);
1019
1020 #ifdef CONFIG_PROC_FS
1021 int ac6_proc_init(struct net *net);
1022 void ac6_proc_exit(struct net *net);
1023 int raw6_proc_init(void);
1024 void raw6_proc_exit(void);
1025 int tcp6_proc_init(struct net *net);
1026 void tcp6_proc_exit(struct net *net);
1027 int udp6_proc_init(struct net *net);
1028 void udp6_proc_exit(struct net *net);
1029 int udplite6_proc_init(void);
1030 void udplite6_proc_exit(void);
1031 int ipv6_misc_proc_init(void);
1032 void ipv6_misc_proc_exit(void);
1033 int snmp6_register_dev(struct inet6_dev *idev);
1034 int snmp6_unregister_dev(struct inet6_dev *idev);
1035
1036 #else
1037 static inline int ac6_proc_init(struct net *net) { return 0; }
1038 static inline void ac6_proc_exit(struct net *net) { }
1039 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1040 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1041 #endif
1042
1043 #ifdef CONFIG_SYSCTL
1044 extern struct ctl_table ipv6_route_table_template[];
1045
1046 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1047 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1048 int ipv6_sysctl_register(void);
1049 void ipv6_sysctl_unregister(void);
1050 #endif
1051
1052 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1053 const struct in6_addr *addr);
1054 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1055 const struct in6_addr *addr);
1056 #endif /* _NET_IPV6_H */
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