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Merge tag 'cpumask-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/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_keys.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 /* Length of this structure */
209 int tot_len;
210
211 /* length of extension headers */
212
213 __u16 opt_flen; /* after fragment hdr */
214 __u16 opt_nflen; /* before fragment hdr */
215
216 struct ipv6_opt_hdr *hopopt;
217 struct ipv6_opt_hdr *dst0opt;
218 struct ipv6_rt_hdr *srcrt; /* Routing Header */
219 struct ipv6_opt_hdr *dst1opt;
220
221 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
222 };
223
224 struct ip6_flowlabel {
225 struct ip6_flowlabel __rcu *next;
226 __be32 label;
227 atomic_t users;
228 struct in6_addr dst;
229 struct ipv6_txoptions *opt;
230 unsigned long linger;
231 struct rcu_head rcu;
232 u8 share;
233 union {
234 struct pid *pid;
235 kuid_t uid;
236 } owner;
237 unsigned long lastuse;
238 unsigned long expires;
239 struct net *fl_net;
240 };
241
242 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
243 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
244 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
245 #define IPV6_TCLASS_SHIFT 20
246
247 struct ipv6_fl_socklist {
248 struct ipv6_fl_socklist __rcu *next;
249 struct ip6_flowlabel *fl;
250 struct rcu_head rcu;
251 };
252
253 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
254 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
255 struct ip6_flowlabel *fl,
256 struct ipv6_txoptions *fopt);
257 void fl6_free_socklist(struct sock *sk);
258 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
259 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
260 int flags);
261 int ip6_flowlabel_init(void);
262 void ip6_flowlabel_cleanup(void);
263
264 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
265 {
266 if (fl)
267 atomic_dec(&fl->users);
268 }
269
270 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
271
272 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
273 struct icmp6hdr *thdr, int len);
274
275 int ip6_ra_control(struct sock *sk, int sel);
276
277 int ipv6_parse_hopopts(struct sk_buff *skb);
278
279 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
280 struct ipv6_txoptions *opt);
281 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
282 struct ipv6_txoptions *opt,
283 int newtype,
284 struct ipv6_opt_hdr __user *newopt,
285 int newoptlen);
286 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
287 struct ipv6_txoptions *opt);
288
289 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
290 const struct inet6_skb_parm *opt);
291
292 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
293 {
294 /* If forwarding is enabled, RA are not accepted unless the special
295 * hybrid mode (accept_ra=2) is enabled.
296 */
297 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
298 idev->cnf.accept_ra;
299 }
300
301 #if IS_ENABLED(CONFIG_IPV6)
302 static inline int ip6_frag_mem(struct net *net)
303 {
304 return sum_frag_mem_limit(&net->ipv6.frags);
305 }
306 #endif
307
308 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
309 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
310 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
311
312 int __ipv6_addr_type(const struct in6_addr *addr);
313 static inline int ipv6_addr_type(const struct in6_addr *addr)
314 {
315 return __ipv6_addr_type(addr) & 0xffff;
316 }
317
318 static inline int ipv6_addr_scope(const struct in6_addr *addr)
319 {
320 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
321 }
322
323 static inline int __ipv6_addr_src_scope(int type)
324 {
325 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
326 }
327
328 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
329 {
330 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
331 }
332
333 static inline bool __ipv6_addr_needs_scope_id(int type)
334 {
335 return type & IPV6_ADDR_LINKLOCAL ||
336 (type & IPV6_ADDR_MULTICAST &&
337 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
338 }
339
340 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
341 {
342 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
343 }
344
345 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
346 {
347 return memcmp(a1, a2, sizeof(struct in6_addr));
348 }
349
350 static inline bool
351 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
352 const struct in6_addr *a2)
353 {
354 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
355 const unsigned long *ul1 = (const unsigned long *)a1;
356 const unsigned long *ulm = (const unsigned long *)m;
357 const unsigned long *ul2 = (const unsigned long *)a2;
358
359 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
360 ((ul1[1] ^ ul2[1]) & ulm[1]));
361 #else
362 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
363 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
364 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
365 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
366 #endif
367 }
368
369 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
370 const struct in6_addr *addr,
371 int plen)
372 {
373 /* caller must guarantee 0 <= plen <= 128 */
374 int o = plen >> 3,
375 b = plen & 0x7;
376
377 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
378 memcpy(pfx->s6_addr, addr, o);
379 if (b != 0)
380 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
381 }
382
383 static inline void __ipv6_addr_set_half(__be32 *addr,
384 __be32 wh, __be32 wl)
385 {
386 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
387 #if defined(__BIG_ENDIAN)
388 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
389 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
390 return;
391 }
392 #elif defined(__LITTLE_ENDIAN)
393 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
394 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
395 return;
396 }
397 #endif
398 #endif
399 addr[0] = wh;
400 addr[1] = wl;
401 }
402
403 static inline void ipv6_addr_set(struct in6_addr *addr,
404 __be32 w1, __be32 w2,
405 __be32 w3, __be32 w4)
406 {
407 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
408 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
409 }
410
411 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
412 const struct in6_addr *a2)
413 {
414 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
415 const unsigned long *ul1 = (const unsigned long *)a1;
416 const unsigned long *ul2 = (const unsigned long *)a2;
417
418 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
419 #else
420 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
421 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
422 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
423 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
424 #endif
425 }
426
427 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
428 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
429 const __be64 *a2,
430 unsigned int len)
431 {
432 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
433 return false;
434 return true;
435 }
436
437 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
438 const struct in6_addr *addr2,
439 unsigned int prefixlen)
440 {
441 const __be64 *a1 = (const __be64 *)addr1;
442 const __be64 *a2 = (const __be64 *)addr2;
443
444 if (prefixlen >= 64) {
445 if (a1[0] ^ a2[0])
446 return false;
447 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
448 }
449 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
450 }
451 #else
452 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
453 const struct in6_addr *addr2,
454 unsigned int prefixlen)
455 {
456 const __be32 *a1 = addr1->s6_addr32;
457 const __be32 *a2 = addr2->s6_addr32;
458 unsigned int pdw, pbi;
459
460 /* check complete u32 in prefix */
461 pdw = prefixlen >> 5;
462 if (pdw && memcmp(a1, a2, pdw << 2))
463 return false;
464
465 /* check incomplete u32 in prefix */
466 pbi = prefixlen & 0x1f;
467 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
468 return false;
469
470 return true;
471 }
472 #endif
473
474 struct inet_frag_queue;
475
476 enum ip6_defrag_users {
477 IP6_DEFRAG_LOCAL_DELIVER,
478 IP6_DEFRAG_CONNTRACK_IN,
479 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
480 IP6_DEFRAG_CONNTRACK_OUT,
481 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
482 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
483 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
484 };
485
486 struct ip6_create_arg {
487 __be32 id;
488 u32 user;
489 const struct in6_addr *src;
490 const struct in6_addr *dst;
491 u8 ecn;
492 };
493
494 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
495 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
496
497 /*
498 * Equivalent of ipv4 struct ip
499 */
500 struct frag_queue {
501 struct inet_frag_queue q;
502
503 __be32 id; /* fragment id */
504 u32 user;
505 struct in6_addr saddr;
506 struct in6_addr daddr;
507
508 int iif;
509 unsigned int csum;
510 __u16 nhoffset;
511 u8 ecn;
512 };
513
514 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
515 struct inet_frags *frags);
516
517 static inline bool ipv6_addr_any(const struct in6_addr *a)
518 {
519 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
520 const unsigned long *ul = (const unsigned long *)a;
521
522 return (ul[0] | ul[1]) == 0UL;
523 #else
524 return (a->s6_addr32[0] | a->s6_addr32[1] |
525 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
526 #endif
527 }
528
529 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
530 {
531 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
532 const unsigned long *ul = (const unsigned long *)a;
533 unsigned long x = ul[0] ^ ul[1];
534
535 return (u32)(x ^ (x >> 32));
536 #else
537 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
538 a->s6_addr32[2] ^ a->s6_addr32[3]);
539 #endif
540 }
541
542 /* more secured version of ipv6_addr_hash() */
543 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
544 {
545 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
546
547 return jhash_3words(v,
548 (__force u32)a->s6_addr32[2],
549 (__force u32)a->s6_addr32[3],
550 initval);
551 }
552
553 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
554 {
555 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
556 const __be64 *be = (const __be64 *)a;
557
558 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
559 #else
560 return (a->s6_addr32[0] | a->s6_addr32[1] |
561 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
562 #endif
563 }
564
565 /*
566 * Note that we must __force cast these to unsigned long to make sparse happy,
567 * since all of the endian-annotated types are fixed size regardless of arch.
568 */
569 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
570 {
571 return (
572 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573 *(unsigned long *)a |
574 #else
575 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
576 #endif
577 (__force unsigned long)(a->s6_addr32[2] ^
578 cpu_to_be32(0x0000ffff))) == 0UL;
579 }
580
581 /*
582 * Check for a RFC 4843 ORCHID address
583 * (Overlay Routable Cryptographic Hash Identifiers)
584 */
585 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
586 {
587 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
588 }
589
590 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
591 {
592 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
593 }
594
595 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
596 struct in6_addr *v4mapped)
597 {
598 ipv6_addr_set(v4mapped,
599 0, 0,
600 htonl(0x0000FFFF),
601 addr);
602 }
603
604 /*
605 * find the first different bit between two addresses
606 * length of address must be a multiple of 32bits
607 */
608 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
609 {
610 const __be32 *a1 = token1, *a2 = token2;
611 int i;
612
613 addrlen >>= 2;
614
615 for (i = 0; i < addrlen; i++) {
616 __be32 xb = a1[i] ^ a2[i];
617 if (xb)
618 return i * 32 + 31 - __fls(ntohl(xb));
619 }
620
621 /*
622 * we should *never* get to this point since that
623 * would mean the addrs are equal
624 *
625 * However, we do get to it 8) And exacly, when
626 * addresses are equal 8)
627 *
628 * ip route add 1111::/128 via ...
629 * ip route add 1111::/64 via ...
630 * and we are here.
631 *
632 * Ideally, this function should stop comparison
633 * at prefix length. It does not, but it is still OK,
634 * if returned value is greater than prefix length.
635 * --ANK (980803)
636 */
637 return addrlen << 5;
638 }
639
640 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
641 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
642 {
643 const __be64 *a1 = token1, *a2 = token2;
644 int i;
645
646 addrlen >>= 3;
647
648 for (i = 0; i < addrlen; i++) {
649 __be64 xb = a1[i] ^ a2[i];
650 if (xb)
651 return i * 64 + 63 - __fls(be64_to_cpu(xb));
652 }
653
654 return addrlen << 6;
655 }
656 #endif
657
658 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
659 {
660 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
661 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
662 return __ipv6_addr_diff64(token1, token2, addrlen);
663 #endif
664 return __ipv6_addr_diff32(token1, token2, addrlen);
665 }
666
667 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
668 {
669 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
670 }
671
672 void ipv6_select_ident(struct net *net, struct frag_hdr *fhdr,
673 struct rt6_info *rt);
674 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
675
676 int ip6_dst_hoplimit(struct dst_entry *dst);
677
678 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
679 struct dst_entry *dst)
680 {
681 int hlimit;
682
683 if (ipv6_addr_is_multicast(&fl6->daddr))
684 hlimit = np->mcast_hops;
685 else
686 hlimit = np->hop_limit;
687 if (hlimit < 0)
688 hlimit = ip6_dst_hoplimit(dst);
689 return hlimit;
690 }
691
692 #if IS_ENABLED(CONFIG_IPV6)
693 static inline void ip6_set_txhash(struct sock *sk)
694 {
695 struct inet_sock *inet = inet_sk(sk);
696 struct ipv6_pinfo *np = inet6_sk(sk);
697 struct flow_keys keys;
698
699 keys.src = (__force __be32)ipv6_addr_hash(&np->saddr);
700 keys.dst = (__force __be32)ipv6_addr_hash(&sk->sk_v6_daddr);
701 keys.port16[0] = inet->inet_sport;
702 keys.port16[1] = inet->inet_dport;
703
704 sk->sk_txhash = flow_hash_from_keys(&keys);
705 }
706
707 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
708 __be32 flowlabel, bool autolabel)
709 {
710 if (!flowlabel && (autolabel || net->ipv6.sysctl.auto_flowlabels)) {
711 u32 hash;
712
713 hash = skb_get_hash(skb);
714
715 /* Since this is being sent on the wire obfuscate hash a bit
716 * to minimize possbility that any useful information to an
717 * attacker is leaked. Only lower 20 bits are relevant.
718 */
719 hash ^= hash >> 12;
720
721 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
722 }
723
724 return flowlabel;
725 }
726 #else
727 static inline void ip6_set_txhash(struct sock *sk) { }
728 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
729 __be32 flowlabel, bool autolabel)
730 {
731 return flowlabel;
732 }
733 #endif
734
735
736 /*
737 * Header manipulation
738 */
739 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
740 __be32 flowlabel)
741 {
742 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
743 }
744
745 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
746 {
747 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
748 }
749
750 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
751 {
752 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
753 }
754
755 static inline u8 ip6_tclass(__be32 flowinfo)
756 {
757 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
758 }
759 /*
760 * Prototypes exported by ipv6
761 */
762
763 /*
764 * rcv function (called from netdevice level)
765 */
766
767 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
768 struct packet_type *pt, struct net_device *orig_dev);
769
770 int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb);
771
772 /*
773 * upper-layer output functions
774 */
775 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
776 struct ipv6_txoptions *opt, int tclass);
777
778 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
779
780 int ip6_append_data(struct sock *sk,
781 int getfrag(void *from, char *to, int offset, int len,
782 int odd, struct sk_buff *skb),
783 void *from, int length, int transhdrlen, int hlimit,
784 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
785 struct rt6_info *rt, unsigned int flags, int dontfrag);
786
787 int ip6_push_pending_frames(struct sock *sk);
788
789 void ip6_flush_pending_frames(struct sock *sk);
790
791 int ip6_send_skb(struct sk_buff *skb);
792
793 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
794 struct inet_cork_full *cork,
795 struct inet6_cork *v6_cork);
796 struct sk_buff *ip6_make_skb(struct sock *sk,
797 int getfrag(void *from, char *to, int offset,
798 int len, int odd, struct sk_buff *skb),
799 void *from, int length, int transhdrlen,
800 int hlimit, int tclass, struct ipv6_txoptions *opt,
801 struct flowi6 *fl6, struct rt6_info *rt,
802 unsigned int flags, int dontfrag);
803
804 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
805 {
806 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
807 &inet6_sk(sk)->cork);
808 }
809
810 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
811 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
812 const struct in6_addr *final_dst);
813 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
814 const struct in6_addr *final_dst);
815 struct dst_entry *ip6_blackhole_route(struct net *net,
816 struct dst_entry *orig_dst);
817
818 /*
819 * skb processing functions
820 */
821
822 int ip6_output(struct sock *sk, struct sk_buff *skb);
823 int ip6_forward(struct sk_buff *skb);
824 int ip6_input(struct sk_buff *skb);
825 int ip6_mc_input(struct sk_buff *skb);
826
827 int __ip6_local_out(struct sk_buff *skb);
828 int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb);
829 int ip6_local_out(struct sk_buff *skb);
830
831 /*
832 * Extension header (options) processing
833 */
834
835 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
836 u8 *proto, struct in6_addr **daddr_p);
837 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
838 u8 *proto);
839
840 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
841 __be16 *frag_offp);
842
843 bool ipv6_ext_hdr(u8 nexthdr);
844
845 enum {
846 IP6_FH_F_FRAG = (1 << 0),
847 IP6_FH_F_AUTH = (1 << 1),
848 IP6_FH_F_SKIP_RH = (1 << 2),
849 };
850
851 /* find specified header and get offset to it */
852 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
853 unsigned short *fragoff, int *fragflg);
854
855 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
856
857 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
858 const struct ipv6_txoptions *opt,
859 struct in6_addr *orig);
860
861 /*
862 * socket options (ipv6_sockglue.c)
863 */
864
865 int ipv6_setsockopt(struct sock *sk, int level, int optname,
866 char __user *optval, unsigned int optlen);
867 int ipv6_getsockopt(struct sock *sk, int level, int optname,
868 char __user *optval, int __user *optlen);
869 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
870 char __user *optval, unsigned int optlen);
871 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
872 char __user *optval, int __user *optlen);
873
874 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
875 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
876 int addr_len);
877
878 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
879 int *addr_len);
880 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
881 int *addr_len);
882 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
883 u32 info, u8 *payload);
884 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
885 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
886
887 int inet6_release(struct socket *sock);
888 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
889 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
890 int peer);
891 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
892
893 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
894 struct sock *sk);
895
896 /*
897 * reassembly.c
898 */
899 extern const struct proto_ops inet6_stream_ops;
900 extern const struct proto_ops inet6_dgram_ops;
901
902 struct group_source_req;
903 struct group_filter;
904
905 int ip6_mc_source(int add, int omode, struct sock *sk,
906 struct group_source_req *pgsr);
907 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
908 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
909 struct group_filter __user *optval, int __user *optlen);
910
911 #ifdef CONFIG_PROC_FS
912 int ac6_proc_init(struct net *net);
913 void ac6_proc_exit(struct net *net);
914 int raw6_proc_init(void);
915 void raw6_proc_exit(void);
916 int tcp6_proc_init(struct net *net);
917 void tcp6_proc_exit(struct net *net);
918 int udp6_proc_init(struct net *net);
919 void udp6_proc_exit(struct net *net);
920 int udplite6_proc_init(void);
921 void udplite6_proc_exit(void);
922 int ipv6_misc_proc_init(void);
923 void ipv6_misc_proc_exit(void);
924 int snmp6_register_dev(struct inet6_dev *idev);
925 int snmp6_unregister_dev(struct inet6_dev *idev);
926
927 #else
928 static inline int ac6_proc_init(struct net *net) { return 0; }
929 static inline void ac6_proc_exit(struct net *net) { }
930 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
931 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
932 #endif
933
934 #ifdef CONFIG_SYSCTL
935 extern struct ctl_table ipv6_route_table_template[];
936
937 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
938 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
939 int ipv6_sysctl_register(void);
940 void ipv6_sysctl_unregister(void);
941 #endif
942
943 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
944 const struct in6_addr *addr);
945 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
946 const struct in6_addr *addr);
947 #endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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