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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[people/ms/linux.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, modifier, idev, field) \
125 ({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
130 })
131
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, modifier, 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 SNMP_INC_STATS##modifier((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, modifier, idev, field, val) \
151 ({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
156 })
157
158 #define _DEVUPD(net, statname, modifier, idev, field, val) \
159 ({ \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
163 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
164 })
165
166 /* MIBs */
167
168 #define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, 64, idev, field)
170 #define IP6_INC_STATS_BH(net, idev,field) \
171 _DEVINC(net, ipv6, 64_BH, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64, idev, field, val)
174 #define IP6_ADD_STATS_BH(net, idev,field,val) \
175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64, idev, field, val)
178 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define ICMP6_INC_STATS_BH(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
184
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
189 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
191
192 struct ip6_ra_chain {
193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197 };
198
199 extern struct ip6_ra_chain *ip6_ra_chain;
200 extern rwlock_t ip6_ra_lock;
201
202 /*
203 This structure is prepared by protocol, when parsing
204 ancillary data and passed to IPv6.
205 */
206
207 struct ipv6_txoptions {
208 atomic_t refcnt;
209 /* Length of this structure */
210 int tot_len;
211
212 /* length of extension headers */
213
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
216
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
220 struct ipv6_opt_hdr *dst1opt;
221 struct rcu_head rcu;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223 };
224
225 struct ip6_flowlabel {
226 struct ip6_flowlabel __rcu *next;
227 __be32 label;
228 atomic_t users;
229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
231 unsigned long linger;
232 struct rcu_head rcu;
233 u8 share;
234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
238 unsigned long lastuse;
239 unsigned long expires;
240 struct net *fl_net;
241 };
242
243 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
246
247 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
248 #define IPV6_TCLASS_SHIFT 20
249
250 struct ipv6_fl_socklist {
251 struct ipv6_fl_socklist __rcu *next;
252 struct ip6_flowlabel *fl;
253 struct rcu_head rcu;
254 };
255
256 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
257 {
258 struct ipv6_txoptions *opt;
259
260 rcu_read_lock();
261 opt = rcu_dereference(np->opt);
262 if (opt && !atomic_inc_not_zero(&opt->refcnt))
263 opt = NULL;
264 rcu_read_unlock();
265 return opt;
266 }
267
268 static inline void txopt_put(struct ipv6_txoptions *opt)
269 {
270 if (opt && atomic_dec_and_test(&opt->refcnt))
271 kfree_rcu(opt, rcu);
272 }
273
274 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
275 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
276 struct ip6_flowlabel *fl,
277 struct ipv6_txoptions *fopt);
278 void fl6_free_socklist(struct sock *sk);
279 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
280 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
281 int flags);
282 int ip6_flowlabel_init(void);
283 void ip6_flowlabel_cleanup(void);
284
285 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
286 {
287 if (fl)
288 atomic_dec(&fl->users);
289 }
290
291 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
292
293 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
294 struct icmp6hdr *thdr, int len);
295
296 int ip6_ra_control(struct sock *sk, int sel);
297
298 int ipv6_parse_hopopts(struct sk_buff *skb);
299
300 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
301 struct ipv6_txoptions *opt);
302 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
303 struct ipv6_txoptions *opt,
304 int newtype,
305 struct ipv6_opt_hdr __user *newopt,
306 int newoptlen);
307 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
308 struct ipv6_txoptions *opt);
309
310 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
311 const struct inet6_skb_parm *opt);
312
313 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
314 {
315 /* If forwarding is enabled, RA are not accepted unless the special
316 * hybrid mode (accept_ra=2) is enabled.
317 */
318 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
319 idev->cnf.accept_ra;
320 }
321
322 #if IS_ENABLED(CONFIG_IPV6)
323 static inline int ip6_frag_mem(struct net *net)
324 {
325 return sum_frag_mem_limit(&net->ipv6.frags);
326 }
327 #endif
328
329 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
330 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
331 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
332
333 int __ipv6_addr_type(const struct in6_addr *addr);
334 static inline int ipv6_addr_type(const struct in6_addr *addr)
335 {
336 return __ipv6_addr_type(addr) & 0xffff;
337 }
338
339 static inline int ipv6_addr_scope(const struct in6_addr *addr)
340 {
341 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
342 }
343
344 static inline int __ipv6_addr_src_scope(int type)
345 {
346 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
347 }
348
349 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
350 {
351 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
352 }
353
354 static inline bool __ipv6_addr_needs_scope_id(int type)
355 {
356 return type & IPV6_ADDR_LINKLOCAL ||
357 (type & IPV6_ADDR_MULTICAST &&
358 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
359 }
360
361 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
362 {
363 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
364 }
365
366 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
367 {
368 return memcmp(a1, a2, sizeof(struct in6_addr));
369 }
370
371 static inline bool
372 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
373 const struct in6_addr *a2)
374 {
375 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
376 const unsigned long *ul1 = (const unsigned long *)a1;
377 const unsigned long *ulm = (const unsigned long *)m;
378 const unsigned long *ul2 = (const unsigned long *)a2;
379
380 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
381 ((ul1[1] ^ ul2[1]) & ulm[1]));
382 #else
383 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
384 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
385 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
386 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
387 #endif
388 }
389
390 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
391 const struct in6_addr *addr,
392 int plen)
393 {
394 /* caller must guarantee 0 <= plen <= 128 */
395 int o = plen >> 3,
396 b = plen & 0x7;
397
398 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
399 memcpy(pfx->s6_addr, addr, o);
400 if (b != 0)
401 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
402 }
403
404 static inline void __ipv6_addr_set_half(__be32 *addr,
405 __be32 wh, __be32 wl)
406 {
407 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
408 #if defined(__BIG_ENDIAN)
409 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
410 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
411 return;
412 }
413 #elif defined(__LITTLE_ENDIAN)
414 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
415 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
416 return;
417 }
418 #endif
419 #endif
420 addr[0] = wh;
421 addr[1] = wl;
422 }
423
424 static inline void ipv6_addr_set(struct in6_addr *addr,
425 __be32 w1, __be32 w2,
426 __be32 w3, __be32 w4)
427 {
428 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
429 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
430 }
431
432 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
433 const struct in6_addr *a2)
434 {
435 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
436 const unsigned long *ul1 = (const unsigned long *)a1;
437 const unsigned long *ul2 = (const unsigned long *)a2;
438
439 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
440 #else
441 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
442 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
443 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
444 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
445 #endif
446 }
447
448 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
449 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
450 const __be64 *a2,
451 unsigned int len)
452 {
453 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
454 return false;
455 return true;
456 }
457
458 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
459 const struct in6_addr *addr2,
460 unsigned int prefixlen)
461 {
462 const __be64 *a1 = (const __be64 *)addr1;
463 const __be64 *a2 = (const __be64 *)addr2;
464
465 if (prefixlen >= 64) {
466 if (a1[0] ^ a2[0])
467 return false;
468 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
469 }
470 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
471 }
472 #else
473 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
474 const struct in6_addr *addr2,
475 unsigned int prefixlen)
476 {
477 const __be32 *a1 = addr1->s6_addr32;
478 const __be32 *a2 = addr2->s6_addr32;
479 unsigned int pdw, pbi;
480
481 /* check complete u32 in prefix */
482 pdw = prefixlen >> 5;
483 if (pdw && memcmp(a1, a2, pdw << 2))
484 return false;
485
486 /* check incomplete u32 in prefix */
487 pbi = prefixlen & 0x1f;
488 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
489 return false;
490
491 return true;
492 }
493 #endif
494
495 struct inet_frag_queue;
496
497 enum ip6_defrag_users {
498 IP6_DEFRAG_LOCAL_DELIVER,
499 IP6_DEFRAG_CONNTRACK_IN,
500 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
501 IP6_DEFRAG_CONNTRACK_OUT,
502 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
503 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
504 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
505 };
506
507 struct ip6_create_arg {
508 __be32 id;
509 u32 user;
510 const struct in6_addr *src;
511 const struct in6_addr *dst;
512 int iif;
513 u8 ecn;
514 };
515
516 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
517 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
518
519 /*
520 * Equivalent of ipv4 struct ip
521 */
522 struct frag_queue {
523 struct inet_frag_queue q;
524
525 __be32 id; /* fragment id */
526 u32 user;
527 struct in6_addr saddr;
528 struct in6_addr daddr;
529
530 int iif;
531 unsigned int csum;
532 __u16 nhoffset;
533 u8 ecn;
534 };
535
536 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
537 struct inet_frags *frags);
538
539 static inline bool ipv6_addr_any(const struct in6_addr *a)
540 {
541 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
542 const unsigned long *ul = (const unsigned long *)a;
543
544 return (ul[0] | ul[1]) == 0UL;
545 #else
546 return (a->s6_addr32[0] | a->s6_addr32[1] |
547 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
548 #endif
549 }
550
551 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
552 {
553 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
554 const unsigned long *ul = (const unsigned long *)a;
555 unsigned long x = ul[0] ^ ul[1];
556
557 return (u32)(x ^ (x >> 32));
558 #else
559 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
560 a->s6_addr32[2] ^ a->s6_addr32[3]);
561 #endif
562 }
563
564 /* more secured version of ipv6_addr_hash() */
565 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
566 {
567 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
568
569 return jhash_3words(v,
570 (__force u32)a->s6_addr32[2],
571 (__force u32)a->s6_addr32[3],
572 initval);
573 }
574
575 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
576 {
577 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
578 const __be64 *be = (const __be64 *)a;
579
580 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
581 #else
582 return (a->s6_addr32[0] | a->s6_addr32[1] |
583 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
584 #endif
585 }
586
587 /*
588 * Note that we must __force cast these to unsigned long to make sparse happy,
589 * since all of the endian-annotated types are fixed size regardless of arch.
590 */
591 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
592 {
593 return (
594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
595 *(unsigned long *)a |
596 #else
597 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
598 #endif
599 (__force unsigned long)(a->s6_addr32[2] ^
600 cpu_to_be32(0x0000ffff))) == 0UL;
601 }
602
603 /*
604 * Check for a RFC 4843 ORCHID address
605 * (Overlay Routable Cryptographic Hash Identifiers)
606 */
607 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
608 {
609 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
610 }
611
612 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
613 {
614 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
615 }
616
617 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
618 struct in6_addr *v4mapped)
619 {
620 ipv6_addr_set(v4mapped,
621 0, 0,
622 htonl(0x0000FFFF),
623 addr);
624 }
625
626 /*
627 * find the first different bit between two addresses
628 * length of address must be a multiple of 32bits
629 */
630 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
631 {
632 const __be32 *a1 = token1, *a2 = token2;
633 int i;
634
635 addrlen >>= 2;
636
637 for (i = 0; i < addrlen; i++) {
638 __be32 xb = a1[i] ^ a2[i];
639 if (xb)
640 return i * 32 + 31 - __fls(ntohl(xb));
641 }
642
643 /*
644 * we should *never* get to this point since that
645 * would mean the addrs are equal
646 *
647 * However, we do get to it 8) And exacly, when
648 * addresses are equal 8)
649 *
650 * ip route add 1111::/128 via ...
651 * ip route add 1111::/64 via ...
652 * and we are here.
653 *
654 * Ideally, this function should stop comparison
655 * at prefix length. It does not, but it is still OK,
656 * if returned value is greater than prefix length.
657 * --ANK (980803)
658 */
659 return addrlen << 5;
660 }
661
662 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
663 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
664 {
665 const __be64 *a1 = token1, *a2 = token2;
666 int i;
667
668 addrlen >>= 3;
669
670 for (i = 0; i < addrlen; i++) {
671 __be64 xb = a1[i] ^ a2[i];
672 if (xb)
673 return i * 64 + 63 - __fls(be64_to_cpu(xb));
674 }
675
676 return addrlen << 6;
677 }
678 #endif
679
680 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
681 {
682 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
683 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
684 return __ipv6_addr_diff64(token1, token2, addrlen);
685 #endif
686 return __ipv6_addr_diff32(token1, token2, addrlen);
687 }
688
689 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
690 {
691 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
692 }
693
694 __be32 ipv6_select_ident(struct net *net,
695 const struct in6_addr *daddr,
696 const struct in6_addr *saddr);
697 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
698
699 int ip6_dst_hoplimit(struct dst_entry *dst);
700
701 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
702 struct dst_entry *dst)
703 {
704 int hlimit;
705
706 if (ipv6_addr_is_multicast(&fl6->daddr))
707 hlimit = np->mcast_hops;
708 else
709 hlimit = np->hop_limit;
710 if (hlimit < 0)
711 hlimit = ip6_dst_hoplimit(dst);
712 return hlimit;
713 }
714
715 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
716 * Equivalent to : flow->v6addrs.src = iph->saddr;
717 * flow->v6addrs.dst = iph->daddr;
718 */
719 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
720 const struct ipv6hdr *iph)
721 {
722 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
723 offsetof(typeof(flow->addrs), v6addrs.src) +
724 sizeof(flow->addrs.v6addrs.src));
725 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
726 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
727 }
728
729 #if IS_ENABLED(CONFIG_IPV6)
730
731 /* Sysctl settings for net ipv6.auto_flowlabels */
732 #define IP6_AUTO_FLOW_LABEL_OFF 0
733 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
734 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
735 #define IP6_AUTO_FLOW_LABEL_FORCED 3
736
737 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
738
739 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
740
741 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
742 __be32 flowlabel, bool autolabel,
743 struct flowi6 *fl6)
744 {
745 u32 hash;
746
747 if (flowlabel ||
748 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
749 (!autolabel &&
750 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
751 return flowlabel;
752
753 hash = skb_get_hash_flowi6(skb, fl6);
754
755 /* Since this is being sent on the wire obfuscate hash a bit
756 * to minimize possbility that any useful information to an
757 * attacker is leaked. Only lower 20 bits are relevant.
758 */
759 rol32(hash, 16);
760
761 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
762
763 if (net->ipv6.sysctl.flowlabel_state_ranges)
764 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
765
766 return flowlabel;
767 }
768
769 static inline int ip6_default_np_autolabel(struct net *net)
770 {
771 switch (net->ipv6.sysctl.auto_flowlabels) {
772 case IP6_AUTO_FLOW_LABEL_OFF:
773 case IP6_AUTO_FLOW_LABEL_OPTIN:
774 default:
775 return 0;
776 case IP6_AUTO_FLOW_LABEL_OPTOUT:
777 case IP6_AUTO_FLOW_LABEL_FORCED:
778 return 1;
779 }
780 }
781 #else
782 static inline void ip6_set_txhash(struct sock *sk) { }
783 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
784 __be32 flowlabel, bool autolabel,
785 struct flowi6 *fl6)
786 {
787 return flowlabel;
788 }
789 static inline int ip6_default_np_autolabel(struct net *net)
790 {
791 return 0;
792 }
793 #endif
794
795
796 /*
797 * Header manipulation
798 */
799 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
800 __be32 flowlabel)
801 {
802 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
803 }
804
805 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
806 {
807 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
808 }
809
810 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
811 {
812 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
813 }
814
815 static inline u8 ip6_tclass(__be32 flowinfo)
816 {
817 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
818 }
819 /*
820 * Prototypes exported by ipv6
821 */
822
823 /*
824 * rcv function (called from netdevice level)
825 */
826
827 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
828 struct packet_type *pt, struct net_device *orig_dev);
829
830 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
831
832 /*
833 * upper-layer output functions
834 */
835 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
836 struct ipv6_txoptions *opt, int tclass);
837
838 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
839
840 int ip6_append_data(struct sock *sk,
841 int getfrag(void *from, char *to, int offset, int len,
842 int odd, struct sk_buff *skb),
843 void *from, int length, int transhdrlen, int hlimit,
844 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
845 struct rt6_info *rt, unsigned int flags, int dontfrag);
846
847 int ip6_push_pending_frames(struct sock *sk);
848
849 void ip6_flush_pending_frames(struct sock *sk);
850
851 int ip6_send_skb(struct sk_buff *skb);
852
853 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
854 struct inet_cork_full *cork,
855 struct inet6_cork *v6_cork);
856 struct sk_buff *ip6_make_skb(struct sock *sk,
857 int getfrag(void *from, char *to, int offset,
858 int len, int odd, struct sk_buff *skb),
859 void *from, int length, int transhdrlen,
860 int hlimit, int tclass, struct ipv6_txoptions *opt,
861 struct flowi6 *fl6, struct rt6_info *rt,
862 unsigned int flags, int dontfrag);
863
864 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
865 {
866 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
867 &inet6_sk(sk)->cork);
868 }
869
870 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
871 struct flowi6 *fl6);
872 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
873 const struct in6_addr *final_dst);
874 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
875 const struct in6_addr *final_dst);
876 struct dst_entry *ip6_blackhole_route(struct net *net,
877 struct dst_entry *orig_dst);
878
879 /*
880 * skb processing functions
881 */
882
883 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
884 int ip6_forward(struct sk_buff *skb);
885 int ip6_input(struct sk_buff *skb);
886 int ip6_mc_input(struct sk_buff *skb);
887
888 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
889 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
890
891 /*
892 * Extension header (options) processing
893 */
894
895 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
896 u8 *proto, struct in6_addr **daddr_p);
897 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
898 u8 *proto);
899
900 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
901 __be16 *frag_offp);
902
903 bool ipv6_ext_hdr(u8 nexthdr);
904
905 enum {
906 IP6_FH_F_FRAG = (1 << 0),
907 IP6_FH_F_AUTH = (1 << 1),
908 IP6_FH_F_SKIP_RH = (1 << 2),
909 };
910
911 /* find specified header and get offset to it */
912 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
913 unsigned short *fragoff, int *fragflg);
914
915 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
916
917 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
918 const struct ipv6_txoptions *opt,
919 struct in6_addr *orig);
920
921 /*
922 * socket options (ipv6_sockglue.c)
923 */
924
925 int ipv6_setsockopt(struct sock *sk, int level, int optname,
926 char __user *optval, unsigned int optlen);
927 int ipv6_getsockopt(struct sock *sk, int level, int optname,
928 char __user *optval, int __user *optlen);
929 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
930 char __user *optval, unsigned int optlen);
931 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
932 char __user *optval, int __user *optlen);
933
934 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
935 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
936 int addr_len);
937
938 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
939 int *addr_len);
940 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
941 int *addr_len);
942 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
943 u32 info, u8 *payload);
944 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
945 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
946
947 int inet6_release(struct socket *sock);
948 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
949 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
950 int peer);
951 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
952
953 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
954 struct sock *sk);
955
956 /*
957 * reassembly.c
958 */
959 extern const struct proto_ops inet6_stream_ops;
960 extern const struct proto_ops inet6_dgram_ops;
961
962 struct group_source_req;
963 struct group_filter;
964
965 int ip6_mc_source(int add, int omode, struct sock *sk,
966 struct group_source_req *pgsr);
967 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
968 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
969 struct group_filter __user *optval, int __user *optlen);
970
971 #ifdef CONFIG_PROC_FS
972 int ac6_proc_init(struct net *net);
973 void ac6_proc_exit(struct net *net);
974 int raw6_proc_init(void);
975 void raw6_proc_exit(void);
976 int tcp6_proc_init(struct net *net);
977 void tcp6_proc_exit(struct net *net);
978 int udp6_proc_init(struct net *net);
979 void udp6_proc_exit(struct net *net);
980 int udplite6_proc_init(void);
981 void udplite6_proc_exit(void);
982 int ipv6_misc_proc_init(void);
983 void ipv6_misc_proc_exit(void);
984 int snmp6_register_dev(struct inet6_dev *idev);
985 int snmp6_unregister_dev(struct inet6_dev *idev);
986
987 #else
988 static inline int ac6_proc_init(struct net *net) { return 0; }
989 static inline void ac6_proc_exit(struct net *net) { }
990 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
991 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
992 #endif
993
994 #ifdef CONFIG_SYSCTL
995 extern struct ctl_table ipv6_route_table_template[];
996
997 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
998 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
999 int ipv6_sysctl_register(void);
1000 void ipv6_sysctl_unregister(void);
1001 #endif
1002
1003 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1004 const struct in6_addr *addr);
1005 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1006 const struct in6_addr *addr);
1007 #endif /* _NET_IPV6_H */
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