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ipv6: kill ICMP6MSGIN_INC_STATS_BH()
[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_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(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(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(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(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 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 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
255 {
256 struct ipv6_txoptions *opt;
257
258 rcu_read_lock();
259 opt = rcu_dereference(np->opt);
260 if (opt) {
261 if (!atomic_inc_not_zero(&opt->refcnt))
262 opt = NULL;
263 else
264 opt = rcu_pointer_handoff(opt);
265 }
266 rcu_read_unlock();
267 return opt;
268 }
269
270 static inline void txopt_put(struct ipv6_txoptions *opt)
271 {
272 if (opt && atomic_dec_and_test(&opt->refcnt))
273 kfree_rcu(opt, rcu);
274 }
275
276 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
277 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
278 struct ip6_flowlabel *fl,
279 struct ipv6_txoptions *fopt);
280 void fl6_free_socklist(struct sock *sk);
281 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
282 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
283 int flags);
284 int ip6_flowlabel_init(void);
285 void ip6_flowlabel_cleanup(void);
286
287 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
288 {
289 if (fl)
290 atomic_dec(&fl->users);
291 }
292
293 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
294
295 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
296 struct icmp6hdr *thdr, int len);
297
298 int ip6_ra_control(struct sock *sk, int sel);
299
300 int ipv6_parse_hopopts(struct sk_buff *skb);
301
302 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
303 struct ipv6_txoptions *opt);
304 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
305 struct ipv6_txoptions *opt,
306 int newtype,
307 struct ipv6_opt_hdr __user *newopt,
308 int newoptlen);
309 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
310 struct ipv6_txoptions *opt);
311
312 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
313 const struct inet6_skb_parm *opt);
314
315 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
316 {
317 /* If forwarding is enabled, RA are not accepted unless the special
318 * hybrid mode (accept_ra=2) is enabled.
319 */
320 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
321 idev->cnf.accept_ra;
322 }
323
324 #if IS_ENABLED(CONFIG_IPV6)
325 static inline int ip6_frag_mem(struct net *net)
326 {
327 return sum_frag_mem_limit(&net->ipv6.frags);
328 }
329 #endif
330
331 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
332 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
333 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
334
335 int __ipv6_addr_type(const struct in6_addr *addr);
336 static inline int ipv6_addr_type(const struct in6_addr *addr)
337 {
338 return __ipv6_addr_type(addr) & 0xffff;
339 }
340
341 static inline int ipv6_addr_scope(const struct in6_addr *addr)
342 {
343 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
344 }
345
346 static inline int __ipv6_addr_src_scope(int type)
347 {
348 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
349 }
350
351 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
352 {
353 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
354 }
355
356 static inline bool __ipv6_addr_needs_scope_id(int type)
357 {
358 return type & IPV6_ADDR_LINKLOCAL ||
359 (type & IPV6_ADDR_MULTICAST &&
360 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
361 }
362
363 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
364 {
365 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
366 }
367
368 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
369 {
370 return memcmp(a1, a2, sizeof(struct in6_addr));
371 }
372
373 static inline bool
374 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
375 const struct in6_addr *a2)
376 {
377 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
378 const unsigned long *ul1 = (const unsigned long *)a1;
379 const unsigned long *ulm = (const unsigned long *)m;
380 const unsigned long *ul2 = (const unsigned long *)a2;
381
382 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
383 ((ul1[1] ^ ul2[1]) & ulm[1]));
384 #else
385 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
386 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
387 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
388 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
389 #endif
390 }
391
392 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
393 const struct in6_addr *addr,
394 int plen)
395 {
396 /* caller must guarantee 0 <= plen <= 128 */
397 int o = plen >> 3,
398 b = plen & 0x7;
399
400 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
401 memcpy(pfx->s6_addr, addr, o);
402 if (b != 0)
403 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
404 }
405
406 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
407 const struct in6_addr *pfx,
408 int plen)
409 {
410 /* caller must guarantee 0 <= plen <= 128 */
411 int o = plen >> 3,
412 b = plen & 0x7;
413
414 memcpy(addr->s6_addr, pfx, o);
415 if (b != 0) {
416 addr->s6_addr[o] &= ~(0xff00 >> b);
417 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
418 }
419 }
420
421 static inline void __ipv6_addr_set_half(__be32 *addr,
422 __be32 wh, __be32 wl)
423 {
424 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
425 #if defined(__BIG_ENDIAN)
426 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
427 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
428 return;
429 }
430 #elif defined(__LITTLE_ENDIAN)
431 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
432 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
433 return;
434 }
435 #endif
436 #endif
437 addr[0] = wh;
438 addr[1] = wl;
439 }
440
441 static inline void ipv6_addr_set(struct in6_addr *addr,
442 __be32 w1, __be32 w2,
443 __be32 w3, __be32 w4)
444 {
445 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
446 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
447 }
448
449 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
450 const struct in6_addr *a2)
451 {
452 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
453 const unsigned long *ul1 = (const unsigned long *)a1;
454 const unsigned long *ul2 = (const unsigned long *)a2;
455
456 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
457 #else
458 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
459 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
460 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
461 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
462 #endif
463 }
464
465 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
466 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
467 const __be64 *a2,
468 unsigned int len)
469 {
470 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
471 return false;
472 return true;
473 }
474
475 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
476 const struct in6_addr *addr2,
477 unsigned int prefixlen)
478 {
479 const __be64 *a1 = (const __be64 *)addr1;
480 const __be64 *a2 = (const __be64 *)addr2;
481
482 if (prefixlen >= 64) {
483 if (a1[0] ^ a2[0])
484 return false;
485 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
486 }
487 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
488 }
489 #else
490 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
491 const struct in6_addr *addr2,
492 unsigned int prefixlen)
493 {
494 const __be32 *a1 = addr1->s6_addr32;
495 const __be32 *a2 = addr2->s6_addr32;
496 unsigned int pdw, pbi;
497
498 /* check complete u32 in prefix */
499 pdw = prefixlen >> 5;
500 if (pdw && memcmp(a1, a2, pdw << 2))
501 return false;
502
503 /* check incomplete u32 in prefix */
504 pbi = prefixlen & 0x1f;
505 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
506 return false;
507
508 return true;
509 }
510 #endif
511
512 struct inet_frag_queue;
513
514 enum ip6_defrag_users {
515 IP6_DEFRAG_LOCAL_DELIVER,
516 IP6_DEFRAG_CONNTRACK_IN,
517 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
518 IP6_DEFRAG_CONNTRACK_OUT,
519 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
520 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
521 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
522 };
523
524 struct ip6_create_arg {
525 __be32 id;
526 u32 user;
527 const struct in6_addr *src;
528 const struct in6_addr *dst;
529 int iif;
530 u8 ecn;
531 };
532
533 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
534 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
535
536 /*
537 * Equivalent of ipv4 struct ip
538 */
539 struct frag_queue {
540 struct inet_frag_queue q;
541
542 __be32 id; /* fragment id */
543 u32 user;
544 struct in6_addr saddr;
545 struct in6_addr daddr;
546
547 int iif;
548 unsigned int csum;
549 __u16 nhoffset;
550 u8 ecn;
551 };
552
553 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
554 struct inet_frags *frags);
555
556 static inline bool ipv6_addr_any(const struct in6_addr *a)
557 {
558 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
559 const unsigned long *ul = (const unsigned long *)a;
560
561 return (ul[0] | ul[1]) == 0UL;
562 #else
563 return (a->s6_addr32[0] | a->s6_addr32[1] |
564 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
565 #endif
566 }
567
568 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
569 {
570 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
571 const unsigned long *ul = (const unsigned long *)a;
572 unsigned long x = ul[0] ^ ul[1];
573
574 return (u32)(x ^ (x >> 32));
575 #else
576 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
577 a->s6_addr32[2] ^ a->s6_addr32[3]);
578 #endif
579 }
580
581 /* more secured version of ipv6_addr_hash() */
582 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
583 {
584 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
585
586 return jhash_3words(v,
587 (__force u32)a->s6_addr32[2],
588 (__force u32)a->s6_addr32[3],
589 initval);
590 }
591
592 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
593 {
594 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
595 const __be64 *be = (const __be64 *)a;
596
597 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
598 #else
599 return (a->s6_addr32[0] | a->s6_addr32[1] |
600 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
601 #endif
602 }
603
604 /*
605 * Note that we must __force cast these to unsigned long to make sparse happy,
606 * since all of the endian-annotated types are fixed size regardless of arch.
607 */
608 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
609 {
610 return (
611 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
612 *(unsigned long *)a |
613 #else
614 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
615 #endif
616 (__force unsigned long)(a->s6_addr32[2] ^
617 cpu_to_be32(0x0000ffff))) == 0UL;
618 }
619
620 /*
621 * Check for a RFC 4843 ORCHID address
622 * (Overlay Routable Cryptographic Hash Identifiers)
623 */
624 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
625 {
626 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
627 }
628
629 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
630 {
631 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
632 }
633
634 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
635 struct in6_addr *v4mapped)
636 {
637 ipv6_addr_set(v4mapped,
638 0, 0,
639 htonl(0x0000FFFF),
640 addr);
641 }
642
643 /*
644 * find the first different bit between two addresses
645 * length of address must be a multiple of 32bits
646 */
647 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
648 {
649 const __be32 *a1 = token1, *a2 = token2;
650 int i;
651
652 addrlen >>= 2;
653
654 for (i = 0; i < addrlen; i++) {
655 __be32 xb = a1[i] ^ a2[i];
656 if (xb)
657 return i * 32 + 31 - __fls(ntohl(xb));
658 }
659
660 /*
661 * we should *never* get to this point since that
662 * would mean the addrs are equal
663 *
664 * However, we do get to it 8) And exacly, when
665 * addresses are equal 8)
666 *
667 * ip route add 1111::/128 via ...
668 * ip route add 1111::/64 via ...
669 * and we are here.
670 *
671 * Ideally, this function should stop comparison
672 * at prefix length. It does not, but it is still OK,
673 * if returned value is greater than prefix length.
674 * --ANK (980803)
675 */
676 return addrlen << 5;
677 }
678
679 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
680 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
681 {
682 const __be64 *a1 = token1, *a2 = token2;
683 int i;
684
685 addrlen >>= 3;
686
687 for (i = 0; i < addrlen; i++) {
688 __be64 xb = a1[i] ^ a2[i];
689 if (xb)
690 return i * 64 + 63 - __fls(be64_to_cpu(xb));
691 }
692
693 return addrlen << 6;
694 }
695 #endif
696
697 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
698 {
699 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
700 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
701 return __ipv6_addr_diff64(token1, token2, addrlen);
702 #endif
703 return __ipv6_addr_diff32(token1, token2, addrlen);
704 }
705
706 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
707 {
708 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
709 }
710
711 __be32 ipv6_select_ident(struct net *net,
712 const struct in6_addr *daddr,
713 const struct in6_addr *saddr);
714 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
715
716 int ip6_dst_hoplimit(struct dst_entry *dst);
717
718 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
719 struct dst_entry *dst)
720 {
721 int hlimit;
722
723 if (ipv6_addr_is_multicast(&fl6->daddr))
724 hlimit = np->mcast_hops;
725 else
726 hlimit = np->hop_limit;
727 if (hlimit < 0)
728 hlimit = ip6_dst_hoplimit(dst);
729 return hlimit;
730 }
731
732 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
733 * Equivalent to : flow->v6addrs.src = iph->saddr;
734 * flow->v6addrs.dst = iph->daddr;
735 */
736 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
737 const struct ipv6hdr *iph)
738 {
739 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
740 offsetof(typeof(flow->addrs), v6addrs.src) +
741 sizeof(flow->addrs.v6addrs.src));
742 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
743 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
744 }
745
746 #if IS_ENABLED(CONFIG_IPV6)
747
748 /* Sysctl settings for net ipv6.auto_flowlabels */
749 #define IP6_AUTO_FLOW_LABEL_OFF 0
750 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
751 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
752 #define IP6_AUTO_FLOW_LABEL_FORCED 3
753
754 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
755
756 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
757
758 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
759 __be32 flowlabel, bool autolabel,
760 struct flowi6 *fl6)
761 {
762 u32 hash;
763
764 if (flowlabel ||
765 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
766 (!autolabel &&
767 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
768 return flowlabel;
769
770 hash = skb_get_hash_flowi6(skb, fl6);
771
772 /* Since this is being sent on the wire obfuscate hash a bit
773 * to minimize possbility that any useful information to an
774 * attacker is leaked. Only lower 20 bits are relevant.
775 */
776 rol32(hash, 16);
777
778 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
779
780 if (net->ipv6.sysctl.flowlabel_state_ranges)
781 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
782
783 return flowlabel;
784 }
785
786 static inline int ip6_default_np_autolabel(struct net *net)
787 {
788 switch (net->ipv6.sysctl.auto_flowlabels) {
789 case IP6_AUTO_FLOW_LABEL_OFF:
790 case IP6_AUTO_FLOW_LABEL_OPTIN:
791 default:
792 return 0;
793 case IP6_AUTO_FLOW_LABEL_OPTOUT:
794 case IP6_AUTO_FLOW_LABEL_FORCED:
795 return 1;
796 }
797 }
798 #else
799 static inline void ip6_set_txhash(struct sock *sk) { }
800 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
801 __be32 flowlabel, bool autolabel,
802 struct flowi6 *fl6)
803 {
804 return flowlabel;
805 }
806 static inline int ip6_default_np_autolabel(struct net *net)
807 {
808 return 0;
809 }
810 #endif
811
812
813 /*
814 * Header manipulation
815 */
816 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
817 __be32 flowlabel)
818 {
819 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
820 }
821
822 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
823 {
824 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
825 }
826
827 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
828 {
829 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
830 }
831
832 static inline u8 ip6_tclass(__be32 flowinfo)
833 {
834 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
835 }
836
837 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
838 {
839 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
840 }
841
842 /*
843 * Prototypes exported by ipv6
844 */
845
846 /*
847 * rcv function (called from netdevice level)
848 */
849
850 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
851 struct packet_type *pt, struct net_device *orig_dev);
852
853 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
854
855 /*
856 * upper-layer output functions
857 */
858 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
859 struct ipv6_txoptions *opt, int tclass);
860
861 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
862
863 int ip6_append_data(struct sock *sk,
864 int getfrag(void *from, char *to, int offset, int len,
865 int odd, struct sk_buff *skb),
866 void *from, int length, int transhdrlen, int hlimit,
867 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
868 struct rt6_info *rt, unsigned int flags, int dontfrag,
869 const struct sockcm_cookie *sockc);
870
871 int ip6_push_pending_frames(struct sock *sk);
872
873 void ip6_flush_pending_frames(struct sock *sk);
874
875 int ip6_send_skb(struct sk_buff *skb);
876
877 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
878 struct inet_cork_full *cork,
879 struct inet6_cork *v6_cork);
880 struct sk_buff *ip6_make_skb(struct sock *sk,
881 int getfrag(void *from, char *to, int offset,
882 int len, int odd, struct sk_buff *skb),
883 void *from, int length, int transhdrlen,
884 int hlimit, int tclass, struct ipv6_txoptions *opt,
885 struct flowi6 *fl6, struct rt6_info *rt,
886 unsigned int flags, int dontfrag,
887 const struct sockcm_cookie *sockc);
888
889 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
890 {
891 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
892 &inet6_sk(sk)->cork);
893 }
894
895 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
896 struct flowi6 *fl6);
897 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
898 const struct in6_addr *final_dst);
899 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
900 const struct in6_addr *final_dst);
901 struct dst_entry *ip6_blackhole_route(struct net *net,
902 struct dst_entry *orig_dst);
903
904 /*
905 * skb processing functions
906 */
907
908 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
909 int ip6_forward(struct sk_buff *skb);
910 int ip6_input(struct sk_buff *skb);
911 int ip6_mc_input(struct sk_buff *skb);
912
913 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
914 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
915
916 /*
917 * Extension header (options) processing
918 */
919
920 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
921 u8 *proto, struct in6_addr **daddr_p);
922 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
923 u8 *proto);
924
925 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
926 __be16 *frag_offp);
927
928 bool ipv6_ext_hdr(u8 nexthdr);
929
930 enum {
931 IP6_FH_F_FRAG = (1 << 0),
932 IP6_FH_F_AUTH = (1 << 1),
933 IP6_FH_F_SKIP_RH = (1 << 2),
934 };
935
936 /* find specified header and get offset to it */
937 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
938 unsigned short *fragoff, int *fragflg);
939
940 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
941
942 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
943 const struct ipv6_txoptions *opt,
944 struct in6_addr *orig);
945
946 /*
947 * socket options (ipv6_sockglue.c)
948 */
949
950 int ipv6_setsockopt(struct sock *sk, int level, int optname,
951 char __user *optval, unsigned int optlen);
952 int ipv6_getsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, int __user *optlen);
954 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
955 char __user *optval, unsigned int optlen);
956 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
957 char __user *optval, int __user *optlen);
958
959 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
960 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
961 int addr_len);
962 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
963 void ip6_datagram_release_cb(struct sock *sk);
964
965 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
966 int *addr_len);
967 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
968 int *addr_len);
969 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
970 u32 info, u8 *payload);
971 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
972 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
973
974 int inet6_release(struct socket *sock);
975 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
976 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
977 int peer);
978 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
979
980 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
981 struct sock *sk);
982
983 /*
984 * reassembly.c
985 */
986 extern const struct proto_ops inet6_stream_ops;
987 extern const struct proto_ops inet6_dgram_ops;
988
989 struct group_source_req;
990 struct group_filter;
991
992 int ip6_mc_source(int add, int omode, struct sock *sk,
993 struct group_source_req *pgsr);
994 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
995 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
996 struct group_filter __user *optval, int __user *optlen);
997
998 #ifdef CONFIG_PROC_FS
999 int ac6_proc_init(struct net *net);
1000 void ac6_proc_exit(struct net *net);
1001 int raw6_proc_init(void);
1002 void raw6_proc_exit(void);
1003 int tcp6_proc_init(struct net *net);
1004 void tcp6_proc_exit(struct net *net);
1005 int udp6_proc_init(struct net *net);
1006 void udp6_proc_exit(struct net *net);
1007 int udplite6_proc_init(void);
1008 void udplite6_proc_exit(void);
1009 int ipv6_misc_proc_init(void);
1010 void ipv6_misc_proc_exit(void);
1011 int snmp6_register_dev(struct inet6_dev *idev);
1012 int snmp6_unregister_dev(struct inet6_dev *idev);
1013
1014 #else
1015 static inline int ac6_proc_init(struct net *net) { return 0; }
1016 static inline void ac6_proc_exit(struct net *net) { }
1017 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1018 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1019 #endif
1020
1021 #ifdef CONFIG_SYSCTL
1022 extern struct ctl_table ipv6_route_table_template[];
1023
1024 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1025 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1026 int ipv6_sysctl_register(void);
1027 void ipv6_sysctl_unregister(void);
1028 #endif
1029
1030 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1031 const struct in6_addr *addr);
1032 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1033 const struct in6_addr *addr);
1034 #endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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