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dt-bindings: Document rk3399 rk-timer bindings
[linux/fpc-iii.git] / include / net / ipv6.h
blob11a045281948f07e638deb4515e60eaaf8c70774
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 *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
317 struct ipv6_txoptions *opt);
318
319 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
320 const struct inet6_skb_parm *opt);
321
322 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
323 {
324 /* If forwarding is enabled, RA are not accepted unless the special
325 * hybrid mode (accept_ra=2) is enabled.
326 */
327 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
328 idev->cnf.accept_ra;
329 }
330
331 #if IS_ENABLED(CONFIG_IPV6)
332 static inline int ip6_frag_mem(struct net *net)
333 {
334 return sum_frag_mem_limit(&net->ipv6.frags);
335 }
336 #endif
337
338 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
339 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
340 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
341
342 int __ipv6_addr_type(const struct in6_addr *addr);
343 static inline int ipv6_addr_type(const struct in6_addr *addr)
344 {
345 return __ipv6_addr_type(addr) & 0xffff;
346 }
347
348 static inline int ipv6_addr_scope(const struct in6_addr *addr)
349 {
350 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
351 }
352
353 static inline int __ipv6_addr_src_scope(int type)
354 {
355 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
356 }
357
358 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
359 {
360 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
361 }
362
363 static inline bool __ipv6_addr_needs_scope_id(int type)
364 {
365 return type & IPV6_ADDR_LINKLOCAL ||
366 (type & IPV6_ADDR_MULTICAST &&
367 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
368 }
369
370 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
371 {
372 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
373 }
374
375 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
376 {
377 return memcmp(a1, a2, sizeof(struct in6_addr));
378 }
379
380 static inline bool
381 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
382 const struct in6_addr *a2)
383 {
384 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
385 const unsigned long *ul1 = (const unsigned long *)a1;
386 const unsigned long *ulm = (const unsigned long *)m;
387 const unsigned long *ul2 = (const unsigned long *)a2;
388
389 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
390 ((ul1[1] ^ ul2[1]) & ulm[1]));
391 #else
392 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
393 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
394 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
395 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
396 #endif
397 }
398
399 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
400 const struct in6_addr *addr,
401 int plen)
402 {
403 /* caller must guarantee 0 <= plen <= 128 */
404 int o = plen >> 3,
405 b = plen & 0x7;
406
407 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
408 memcpy(pfx->s6_addr, addr, o);
409 if (b != 0)
410 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
411 }
412
413 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
414 const struct in6_addr *pfx,
415 int plen)
416 {
417 /* caller must guarantee 0 <= plen <= 128 */
418 int o = plen >> 3,
419 b = plen & 0x7;
420
421 memcpy(addr->s6_addr, pfx, o);
422 if (b != 0) {
423 addr->s6_addr[o] &= ~(0xff00 >> b);
424 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
425 }
426 }
427
428 static inline void __ipv6_addr_set_half(__be32 *addr,
429 __be32 wh, __be32 wl)
430 {
431 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
432 #if defined(__BIG_ENDIAN)
433 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
434 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
435 return;
436 }
437 #elif defined(__LITTLE_ENDIAN)
438 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
439 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
440 return;
441 }
442 #endif
443 #endif
444 addr[0] = wh;
445 addr[1] = wl;
446 }
447
448 static inline void ipv6_addr_set(struct in6_addr *addr,
449 __be32 w1, __be32 w2,
450 __be32 w3, __be32 w4)
451 {
452 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
453 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
454 }
455
456 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
457 const struct in6_addr *a2)
458 {
459 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
460 const unsigned long *ul1 = (const unsigned long *)a1;
461 const unsigned long *ul2 = (const unsigned long *)a2;
462
463 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
464 #else
465 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
466 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
467 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
468 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
469 #endif
470 }
471
472 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
473 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
474 const __be64 *a2,
475 unsigned int len)
476 {
477 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
478 return false;
479 return true;
480 }
481
482 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
483 const struct in6_addr *addr2,
484 unsigned int prefixlen)
485 {
486 const __be64 *a1 = (const __be64 *)addr1;
487 const __be64 *a2 = (const __be64 *)addr2;
488
489 if (prefixlen >= 64) {
490 if (a1[0] ^ a2[0])
491 return false;
492 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
493 }
494 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
495 }
496 #else
497 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
498 const struct in6_addr *addr2,
499 unsigned int prefixlen)
500 {
501 const __be32 *a1 = addr1->s6_addr32;
502 const __be32 *a2 = addr2->s6_addr32;
503 unsigned int pdw, pbi;
504
505 /* check complete u32 in prefix */
506 pdw = prefixlen >> 5;
507 if (pdw && memcmp(a1, a2, pdw << 2))
508 return false;
509
510 /* check incomplete u32 in prefix */
511 pbi = prefixlen & 0x1f;
512 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
513 return false;
514
515 return true;
516 }
517 #endif
518
519 struct inet_frag_queue;
520
521 enum ip6_defrag_users {
522 IP6_DEFRAG_LOCAL_DELIVER,
523 IP6_DEFRAG_CONNTRACK_IN,
524 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
525 IP6_DEFRAG_CONNTRACK_OUT,
526 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
527 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
528 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
529 };
530
531 struct ip6_create_arg {
532 __be32 id;
533 u32 user;
534 const struct in6_addr *src;
535 const struct in6_addr *dst;
536 int iif;
537 u8 ecn;
538 };
539
540 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
541 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
542
543 /*
544 * Equivalent of ipv4 struct ip
545 */
546 struct frag_queue {
547 struct inet_frag_queue q;
548
549 __be32 id; /* fragment id */
550 u32 user;
551 struct in6_addr saddr;
552 struct in6_addr daddr;
553
554 int iif;
555 unsigned int csum;
556 __u16 nhoffset;
557 u8 ecn;
558 };
559
560 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
561 struct inet_frags *frags);
562
563 static inline bool ipv6_addr_any(const struct in6_addr *a)
564 {
565 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
566 const unsigned long *ul = (const unsigned long *)a;
567
568 return (ul[0] | ul[1]) == 0UL;
569 #else
570 return (a->s6_addr32[0] | a->s6_addr32[1] |
571 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
572 #endif
573 }
574
575 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
576 {
577 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
578 const unsigned long *ul = (const unsigned long *)a;
579 unsigned long x = ul[0] ^ ul[1];
580
581 return (u32)(x ^ (x >> 32));
582 #else
583 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
584 a->s6_addr32[2] ^ a->s6_addr32[3]);
585 #endif
586 }
587
588 /* more secured version of ipv6_addr_hash() */
589 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
590 {
591 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
592
593 return jhash_3words(v,
594 (__force u32)a->s6_addr32[2],
595 (__force u32)a->s6_addr32[3],
596 initval);
597 }
598
599 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
600 {
601 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
602 const __be64 *be = (const __be64 *)a;
603
604 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
605 #else
606 return (a->s6_addr32[0] | a->s6_addr32[1] |
607 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
608 #endif
609 }
610
611 /*
612 * Note that we must __force cast these to unsigned long to make sparse happy,
613 * since all of the endian-annotated types are fixed size regardless of arch.
614 */
615 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
616 {
617 return (
618 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
619 *(unsigned long *)a |
620 #else
621 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
622 #endif
623 (__force unsigned long)(a->s6_addr32[2] ^
624 cpu_to_be32(0x0000ffff))) == 0UL;
625 }
626
627 /*
628 * Check for a RFC 4843 ORCHID address
629 * (Overlay Routable Cryptographic Hash Identifiers)
630 */
631 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
632 {
633 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
634 }
635
636 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
637 {
638 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
639 }
640
641 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
642 struct in6_addr *v4mapped)
643 {
644 ipv6_addr_set(v4mapped,
645 0, 0,
646 htonl(0x0000FFFF),
647 addr);
648 }
649
650 /*
651 * find the first different bit between two addresses
652 * length of address must be a multiple of 32bits
653 */
654 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
655 {
656 const __be32 *a1 = token1, *a2 = token2;
657 int i;
658
659 addrlen >>= 2;
660
661 for (i = 0; i < addrlen; i++) {
662 __be32 xb = a1[i] ^ a2[i];
663 if (xb)
664 return i * 32 + 31 - __fls(ntohl(xb));
665 }
666
667 /*
668 * we should *never* get to this point since that
669 * would mean the addrs are equal
670 *
671 * However, we do get to it 8) And exacly, when
672 * addresses are equal 8)
673 *
674 * ip route add 1111::/128 via ...
675 * ip route add 1111::/64 via ...
676 * and we are here.
677 *
678 * Ideally, this function should stop comparison
679 * at prefix length. It does not, but it is still OK,
680 * if returned value is greater than prefix length.
681 * --ANK (980803)
682 */
683 return addrlen << 5;
684 }
685
686 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
687 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
688 {
689 const __be64 *a1 = token1, *a2 = token2;
690 int i;
691
692 addrlen >>= 3;
693
694 for (i = 0; i < addrlen; i++) {
695 __be64 xb = a1[i] ^ a2[i];
696 if (xb)
697 return i * 64 + 63 - __fls(be64_to_cpu(xb));
698 }
699
700 return addrlen << 6;
701 }
702 #endif
703
704 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
705 {
706 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
707 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
708 return __ipv6_addr_diff64(token1, token2, addrlen);
709 #endif
710 return __ipv6_addr_diff32(token1, token2, addrlen);
711 }
712
713 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
714 {
715 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
716 }
717
718 __be32 ipv6_select_ident(struct net *net,
719 const struct in6_addr *daddr,
720 const struct in6_addr *saddr);
721 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
722
723 int ip6_dst_hoplimit(struct dst_entry *dst);
724
725 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
726 struct dst_entry *dst)
727 {
728 int hlimit;
729
730 if (ipv6_addr_is_multicast(&fl6->daddr))
731 hlimit = np->mcast_hops;
732 else
733 hlimit = np->hop_limit;
734 if (hlimit < 0)
735 hlimit = ip6_dst_hoplimit(dst);
736 return hlimit;
737 }
738
739 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
740 * Equivalent to : flow->v6addrs.src = iph->saddr;
741 * flow->v6addrs.dst = iph->daddr;
742 */
743 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
744 const struct ipv6hdr *iph)
745 {
746 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
747 offsetof(typeof(flow->addrs), v6addrs.src) +
748 sizeof(flow->addrs.v6addrs.src));
749 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
750 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
751 }
752
753 #if IS_ENABLED(CONFIG_IPV6)
754
755 /* Sysctl settings for net ipv6.auto_flowlabels */
756 #define IP6_AUTO_FLOW_LABEL_OFF 0
757 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
758 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
759 #define IP6_AUTO_FLOW_LABEL_FORCED 3
760
761 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
762
763 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
764
765 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
766 __be32 flowlabel, bool autolabel,
767 struct flowi6 *fl6)
768 {
769 u32 hash;
770
771 if (flowlabel ||
772 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
773 (!autolabel &&
774 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
775 return flowlabel;
776
777 hash = skb_get_hash_flowi6(skb, fl6);
778
779 /* Since this is being sent on the wire obfuscate hash a bit
780 * to minimize possbility that any useful information to an
781 * attacker is leaked. Only lower 20 bits are relevant.
782 */
783 rol32(hash, 16);
784
785 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
786
787 if (net->ipv6.sysctl.flowlabel_state_ranges)
788 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
789
790 return flowlabel;
791 }
792
793 static inline int ip6_default_np_autolabel(struct net *net)
794 {
795 switch (net->ipv6.sysctl.auto_flowlabels) {
796 case IP6_AUTO_FLOW_LABEL_OFF:
797 case IP6_AUTO_FLOW_LABEL_OPTIN:
798 default:
799 return 0;
800 case IP6_AUTO_FLOW_LABEL_OPTOUT:
801 case IP6_AUTO_FLOW_LABEL_FORCED:
802 return 1;
803 }
804 }
805 #else
806 static inline void ip6_set_txhash(struct sock *sk) { }
807 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
808 __be32 flowlabel, bool autolabel,
809 struct flowi6 *fl6)
810 {
811 return flowlabel;
812 }
813 static inline int ip6_default_np_autolabel(struct net *net)
814 {
815 return 0;
816 }
817 #endif
818
819
820 /*
821 * Header manipulation
822 */
823 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
824 __be32 flowlabel)
825 {
826 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
827 }
828
829 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
830 {
831 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
832 }
833
834 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
835 {
836 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
837 }
838
839 static inline u8 ip6_tclass(__be32 flowinfo)
840 {
841 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
842 }
843
844 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
845 {
846 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
847 }
848
849 /*
850 * Prototypes exported by ipv6
851 */
852
853 /*
854 * rcv function (called from netdevice level)
855 */
856
857 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
858 struct packet_type *pt, struct net_device *orig_dev);
859
860 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
861
862 /*
863 * upper-layer output functions
864 */
865 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
866 struct ipv6_txoptions *opt, int tclass);
867
868 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
869
870 int ip6_append_data(struct sock *sk,
871 int getfrag(void *from, char *to, int offset, int len,
872 int odd, struct sk_buff *skb),
873 void *from, int length, int transhdrlen,
874 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
875 struct rt6_info *rt, unsigned int flags,
876 const struct sockcm_cookie *sockc);
877
878 int ip6_push_pending_frames(struct sock *sk);
879
880 void ip6_flush_pending_frames(struct sock *sk);
881
882 int ip6_send_skb(struct sk_buff *skb);
883
884 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
885 struct inet_cork_full *cork,
886 struct inet6_cork *v6_cork);
887 struct sk_buff *ip6_make_skb(struct sock *sk,
888 int getfrag(void *from, char *to, int offset,
889 int len, int odd, struct sk_buff *skb),
890 void *from, int length, int transhdrlen,
891 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
892 struct rt6_info *rt, unsigned int flags,
893 const struct sockcm_cookie *sockc);
894
895 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
896 {
897 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
898 &inet6_sk(sk)->cork);
899 }
900
901 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
902 struct flowi6 *fl6);
903 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
904 const struct in6_addr *final_dst);
905 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
906 const struct in6_addr *final_dst);
907 struct dst_entry *ip6_blackhole_route(struct net *net,
908 struct dst_entry *orig_dst);
909
910 /*
911 * skb processing functions
912 */
913
914 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
915 int ip6_forward(struct sk_buff *skb);
916 int ip6_input(struct sk_buff *skb);
917 int ip6_mc_input(struct sk_buff *skb);
918
919 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
920 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
921
922 /*
923 * Extension header (options) processing
924 */
925
926 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
927 u8 *proto, struct in6_addr **daddr_p);
928 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
929 u8 *proto);
930
931 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
932 __be16 *frag_offp);
933
934 bool ipv6_ext_hdr(u8 nexthdr);
935
936 enum {
937 IP6_FH_F_FRAG = (1 << 0),
938 IP6_FH_F_AUTH = (1 << 1),
939 IP6_FH_F_SKIP_RH = (1 << 2),
940 };
941
942 /* find specified header and get offset to it */
943 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
944 unsigned short *fragoff, int *fragflg);
945
946 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
947
948 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
949 const struct ipv6_txoptions *opt,
950 struct in6_addr *orig);
951
952 /*
953 * socket options (ipv6_sockglue.c)
954 */
955
956 int ipv6_setsockopt(struct sock *sk, int level, int optname,
957 char __user *optval, unsigned int optlen);
958 int ipv6_getsockopt(struct sock *sk, int level, int optname,
959 char __user *optval, int __user *optlen);
960 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
961 char __user *optval, unsigned int optlen);
962 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
963 char __user *optval, int __user *optlen);
964
965 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
966 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
967 int addr_len);
968 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
969 void ip6_datagram_release_cb(struct sock *sk);
970
971 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
972 int *addr_len);
973 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
974 int *addr_len);
975 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
976 u32 info, u8 *payload);
977 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
978 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
979
980 int inet6_release(struct socket *sock);
981 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
982 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
983 int peer);
984 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
985
986 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
987 struct sock *sk);
988
989 /*
990 * reassembly.c
991 */
992 extern const struct proto_ops inet6_stream_ops;
993 extern const struct proto_ops inet6_dgram_ops;
994
995 struct group_source_req;
996 struct group_filter;
997
998 int ip6_mc_source(int add, int omode, struct sock *sk,
999 struct group_source_req *pgsr);
1000 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1001 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1002 struct group_filter __user *optval, int __user *optlen);
1003
1004 #ifdef CONFIG_PROC_FS
1005 int ac6_proc_init(struct net *net);
1006 void ac6_proc_exit(struct net *net);
1007 int raw6_proc_init(void);
1008 void raw6_proc_exit(void);
1009 int tcp6_proc_init(struct net *net);
1010 void tcp6_proc_exit(struct net *net);
1011 int udp6_proc_init(struct net *net);
1012 void udp6_proc_exit(struct net *net);
1013 int udplite6_proc_init(void);
1014 void udplite6_proc_exit(void);
1015 int ipv6_misc_proc_init(void);
1016 void ipv6_misc_proc_exit(void);
1017 int snmp6_register_dev(struct inet6_dev *idev);
1018 int snmp6_unregister_dev(struct inet6_dev *idev);
1019
1020 #else
1021 static inline int ac6_proc_init(struct net *net) { return 0; }
1022 static inline void ac6_proc_exit(struct net *net) { }
1023 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1024 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1025 #endif
1026
1027 #ifdef CONFIG_SYSCTL
1028 extern struct ctl_table ipv6_route_table_template[];
1029
1030 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1031 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1032 int ipv6_sysctl_register(void);
1033 void ipv6_sysctl_unregister(void);
1034 #endif
1035
1036 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1037 const struct in6_addr *addr);
1038 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1039 const struct in6_addr *addr);
1040 #endif /* _NET_IPV6_H */
Linux with added FPC-III support