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r8152: fix tx packets accounting
[linux/fpc-iii.git] / include / net / ipv6.h
blobe64210c98c2b540281230606915dcdc086e12a39
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 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
294
295 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
296 {
297 if (fl)
298 atomic_dec(&fl->users);
299 }
300
301 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
302
303 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
304 struct icmp6hdr *thdr, int len);
305
306 int ip6_ra_control(struct sock *sk, int sel);
307
308 int ipv6_parse_hopopts(struct sk_buff *skb);
309
310 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
311 struct ipv6_txoptions *opt);
312 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
313 struct ipv6_txoptions *opt,
314 int newtype,
315 struct ipv6_opt_hdr __user *newopt,
316 int newoptlen);
317 struct ipv6_txoptions *
318 ipv6_renew_options_kern(struct sock *sk,
319 struct ipv6_txoptions *opt,
320 int newtype,
321 struct ipv6_opt_hdr *newopt,
322 int newoptlen);
323 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
324 struct ipv6_txoptions *opt);
325
326 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
327 const struct inet6_skb_parm *opt);
328 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
329 struct ipv6_txoptions *opt);
330
331 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
332 {
333 /* If forwarding is enabled, RA are not accepted unless the special
334 * hybrid mode (accept_ra=2) is enabled.
335 */
336 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
337 idev->cnf.accept_ra;
338 }
339
340 #if IS_ENABLED(CONFIG_IPV6)
341 static inline int ip6_frag_mem(struct net *net)
342 {
343 return sum_frag_mem_limit(&net->ipv6.frags);
344 }
345 #endif
346
347 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
348 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
349 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
350
351 int __ipv6_addr_type(const struct in6_addr *addr);
352 static inline int ipv6_addr_type(const struct in6_addr *addr)
353 {
354 return __ipv6_addr_type(addr) & 0xffff;
355 }
356
357 static inline int ipv6_addr_scope(const struct in6_addr *addr)
358 {
359 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
360 }
361
362 static inline int __ipv6_addr_src_scope(int type)
363 {
364 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
365 }
366
367 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
368 {
369 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
370 }
371
372 static inline bool __ipv6_addr_needs_scope_id(int type)
373 {
374 return type & IPV6_ADDR_LINKLOCAL ||
375 (type & IPV6_ADDR_MULTICAST &&
376 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
377 }
378
379 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
380 {
381 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
382 }
383
384 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
385 {
386 return memcmp(a1, a2, sizeof(struct in6_addr));
387 }
388
389 static inline bool
390 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
391 const struct in6_addr *a2)
392 {
393 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
394 const unsigned long *ul1 = (const unsigned long *)a1;
395 const unsigned long *ulm = (const unsigned long *)m;
396 const unsigned long *ul2 = (const unsigned long *)a2;
397
398 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
399 ((ul1[1] ^ ul2[1]) & ulm[1]));
400 #else
401 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
402 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
403 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
404 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
405 #endif
406 }
407
408 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
409 const struct in6_addr *addr,
410 int plen)
411 {
412 /* caller must guarantee 0 <= plen <= 128 */
413 int o = plen >> 3,
414 b = plen & 0x7;
415
416 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
417 memcpy(pfx->s6_addr, addr, o);
418 if (b != 0)
419 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
420 }
421
422 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
423 const struct in6_addr *pfx,
424 int plen)
425 {
426 /* caller must guarantee 0 <= plen <= 128 */
427 int o = plen >> 3,
428 b = plen & 0x7;
429
430 memcpy(addr->s6_addr, pfx, o);
431 if (b != 0) {
432 addr->s6_addr[o] &= ~(0xff00 >> b);
433 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
434 }
435 }
436
437 static inline void __ipv6_addr_set_half(__be32 *addr,
438 __be32 wh, __be32 wl)
439 {
440 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
441 #if defined(__BIG_ENDIAN)
442 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
443 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
444 return;
445 }
446 #elif defined(__LITTLE_ENDIAN)
447 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
448 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
449 return;
450 }
451 #endif
452 #endif
453 addr[0] = wh;
454 addr[1] = wl;
455 }
456
457 static inline void ipv6_addr_set(struct in6_addr *addr,
458 __be32 w1, __be32 w2,
459 __be32 w3, __be32 w4)
460 {
461 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
462 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
463 }
464
465 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
466 const struct in6_addr *a2)
467 {
468 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
469 const unsigned long *ul1 = (const unsigned long *)a1;
470 const unsigned long *ul2 = (const unsigned long *)a2;
471
472 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
473 #else
474 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
475 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
476 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
477 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
478 #endif
479 }
480
481 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
482 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
483 const __be64 *a2,
484 unsigned int len)
485 {
486 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
487 return false;
488 return true;
489 }
490
491 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
492 const struct in6_addr *addr2,
493 unsigned int prefixlen)
494 {
495 const __be64 *a1 = (const __be64 *)addr1;
496 const __be64 *a2 = (const __be64 *)addr2;
497
498 if (prefixlen >= 64) {
499 if (a1[0] ^ a2[0])
500 return false;
501 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
502 }
503 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
504 }
505 #else
506 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
507 const struct in6_addr *addr2,
508 unsigned int prefixlen)
509 {
510 const __be32 *a1 = addr1->s6_addr32;
511 const __be32 *a2 = addr2->s6_addr32;
512 unsigned int pdw, pbi;
513
514 /* check complete u32 in prefix */
515 pdw = prefixlen >> 5;
516 if (pdw && memcmp(a1, a2, pdw << 2))
517 return false;
518
519 /* check incomplete u32 in prefix */
520 pbi = prefixlen & 0x1f;
521 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
522 return false;
523
524 return true;
525 }
526 #endif
527
528 struct inet_frag_queue;
529
530 enum ip6_defrag_users {
531 IP6_DEFRAG_LOCAL_DELIVER,
532 IP6_DEFRAG_CONNTRACK_IN,
533 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
534 IP6_DEFRAG_CONNTRACK_OUT,
535 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
536 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
537 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
538 };
539
540 struct ip6_create_arg {
541 __be32 id;
542 u32 user;
543 const struct in6_addr *src;
544 const struct in6_addr *dst;
545 int iif;
546 u8 ecn;
547 };
548
549 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
550 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
551
552 /*
553 * Equivalent of ipv4 struct ip
554 */
555 struct frag_queue {
556 struct inet_frag_queue q;
557
558 __be32 id; /* fragment id */
559 u32 user;
560 struct in6_addr saddr;
561 struct in6_addr daddr;
562
563 int iif;
564 unsigned int csum;
565 __u16 nhoffset;
566 u8 ecn;
567 };
568
569 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
570 struct inet_frags *frags);
571
572 static inline bool ipv6_addr_any(const struct in6_addr *a)
573 {
574 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
575 const unsigned long *ul = (const unsigned long *)a;
576
577 return (ul[0] | ul[1]) == 0UL;
578 #else
579 return (a->s6_addr32[0] | a->s6_addr32[1] |
580 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
581 #endif
582 }
583
584 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
585 {
586 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
587 const unsigned long *ul = (const unsigned long *)a;
588 unsigned long x = ul[0] ^ ul[1];
589
590 return (u32)(x ^ (x >> 32));
591 #else
592 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
593 a->s6_addr32[2] ^ a->s6_addr32[3]);
594 #endif
595 }
596
597 /* more secured version of ipv6_addr_hash() */
598 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
599 {
600 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
601
602 return jhash_3words(v,
603 (__force u32)a->s6_addr32[2],
604 (__force u32)a->s6_addr32[3],
605 initval);
606 }
607
608 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
609 {
610 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
611 const __be64 *be = (const __be64 *)a;
612
613 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
614 #else
615 return (a->s6_addr32[0] | a->s6_addr32[1] |
616 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
617 #endif
618 }
619
620 /*
621 * Note that we must __force cast these to unsigned long to make sparse happy,
622 * since all of the endian-annotated types are fixed size regardless of arch.
623 */
624 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
625 {
626 return (
627 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
628 *(unsigned long *)a |
629 #else
630 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
631 #endif
632 (__force unsigned long)(a->s6_addr32[2] ^
633 cpu_to_be32(0x0000ffff))) == 0UL;
634 }
635
636 /*
637 * Check for a RFC 4843 ORCHID address
638 * (Overlay Routable Cryptographic Hash Identifiers)
639 */
640 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
641 {
642 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
643 }
644
645 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
646 {
647 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
648 }
649
650 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
651 struct in6_addr *v4mapped)
652 {
653 ipv6_addr_set(v4mapped,
654 0, 0,
655 htonl(0x0000FFFF),
656 addr);
657 }
658
659 /*
660 * find the first different bit between two addresses
661 * length of address must be a multiple of 32bits
662 */
663 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
664 {
665 const __be32 *a1 = token1, *a2 = token2;
666 int i;
667
668 addrlen >>= 2;
669
670 for (i = 0; i < addrlen; i++) {
671 __be32 xb = a1[i] ^ a2[i];
672 if (xb)
673 return i * 32 + 31 - __fls(ntohl(xb));
674 }
675
676 /*
677 * we should *never* get to this point since that
678 * would mean the addrs are equal
679 *
680 * However, we do get to it 8) And exacly, when
681 * addresses are equal 8)
682 *
683 * ip route add 1111::/128 via ...
684 * ip route add 1111::/64 via ...
685 * and we are here.
686 *
687 * Ideally, this function should stop comparison
688 * at prefix length. It does not, but it is still OK,
689 * if returned value is greater than prefix length.
690 * --ANK (980803)
691 */
692 return addrlen << 5;
693 }
694
695 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
696 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
697 {
698 const __be64 *a1 = token1, *a2 = token2;
699 int i;
700
701 addrlen >>= 3;
702
703 for (i = 0; i < addrlen; i++) {
704 __be64 xb = a1[i] ^ a2[i];
705 if (xb)
706 return i * 64 + 63 - __fls(be64_to_cpu(xb));
707 }
708
709 return addrlen << 6;
710 }
711 #endif
712
713 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
714 {
715 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
716 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
717 return __ipv6_addr_diff64(token1, token2, addrlen);
718 #endif
719 return __ipv6_addr_diff32(token1, token2, addrlen);
720 }
721
722 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
723 {
724 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
725 }
726
727 __be32 ipv6_select_ident(struct net *net,
728 const struct in6_addr *daddr,
729 const struct in6_addr *saddr);
730 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
731
732 int ip6_dst_hoplimit(struct dst_entry *dst);
733
734 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
735 struct dst_entry *dst)
736 {
737 int hlimit;
738
739 if (ipv6_addr_is_multicast(&fl6->daddr))
740 hlimit = np->mcast_hops;
741 else
742 hlimit = np->hop_limit;
743 if (hlimit < 0)
744 hlimit = ip6_dst_hoplimit(dst);
745 return hlimit;
746 }
747
748 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
749 * Equivalent to : flow->v6addrs.src = iph->saddr;
750 * flow->v6addrs.dst = iph->daddr;
751 */
752 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
753 const struct ipv6hdr *iph)
754 {
755 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
756 offsetof(typeof(flow->addrs), v6addrs.src) +
757 sizeof(flow->addrs.v6addrs.src));
758 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
759 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
760 }
761
762 #if IS_ENABLED(CONFIG_IPV6)
763
764 /* Sysctl settings for net ipv6.auto_flowlabels */
765 #define IP6_AUTO_FLOW_LABEL_OFF 0
766 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
767 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
768 #define IP6_AUTO_FLOW_LABEL_FORCED 3
769
770 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
771
772 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
773
774 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
775 __be32 flowlabel, bool autolabel,
776 struct flowi6 *fl6)
777 {
778 u32 hash;
779
780 /* @flowlabel may include more than a flow label, eg, the traffic class.
781 * Here we want only the flow label value.
782 */
783 flowlabel &= IPV6_FLOWLABEL_MASK;
784
785 if (flowlabel ||
786 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
787 (!autolabel &&
788 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
789 return flowlabel;
790
791 hash = skb_get_hash_flowi6(skb, fl6);
792
793 /* Since this is being sent on the wire obfuscate hash a bit
794 * to minimize possbility that any useful information to an
795 * attacker is leaked. Only lower 20 bits are relevant.
796 */
797 rol32(hash, 16);
798
799 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
800
801 if (net->ipv6.sysctl.flowlabel_state_ranges)
802 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
803
804 return flowlabel;
805 }
806
807 static inline int ip6_default_np_autolabel(struct net *net)
808 {
809 switch (net->ipv6.sysctl.auto_flowlabels) {
810 case IP6_AUTO_FLOW_LABEL_OFF:
811 case IP6_AUTO_FLOW_LABEL_OPTIN:
812 default:
813 return 0;
814 case IP6_AUTO_FLOW_LABEL_OPTOUT:
815 case IP6_AUTO_FLOW_LABEL_FORCED:
816 return 1;
817 }
818 }
819 #else
820 static inline void ip6_set_txhash(struct sock *sk) { }
821 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
822 __be32 flowlabel, bool autolabel,
823 struct flowi6 *fl6)
824 {
825 return flowlabel;
826 }
827 static inline int ip6_default_np_autolabel(struct net *net)
828 {
829 return 0;
830 }
831 #endif
832
833
834 /*
835 * Header manipulation
836 */
837 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
838 __be32 flowlabel)
839 {
840 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
841 }
842
843 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
844 {
845 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
846 }
847
848 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
849 {
850 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
851 }
852
853 static inline u8 ip6_tclass(__be32 flowinfo)
854 {
855 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
856 }
857
858 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
859 {
860 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
861 }
862
863 /*
864 * Prototypes exported by ipv6
865 */
866
867 /*
868 * rcv function (called from netdevice level)
869 */
870
871 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
872 struct packet_type *pt, struct net_device *orig_dev);
873
874 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
875
876 /*
877 * upper-layer output functions
878 */
879 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
880 __u32 mark, struct ipv6_txoptions *opt, int tclass);
881
882 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
883
884 int ip6_append_data(struct sock *sk,
885 int getfrag(void *from, char *to, int offset, int len,
886 int odd, struct sk_buff *skb),
887 void *from, int length, int transhdrlen,
888 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
889 struct rt6_info *rt, unsigned int flags,
890 const struct sockcm_cookie *sockc);
891
892 int ip6_push_pending_frames(struct sock *sk);
893
894 void ip6_flush_pending_frames(struct sock *sk);
895
896 int ip6_send_skb(struct sk_buff *skb);
897
898 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
899 struct inet_cork_full *cork,
900 struct inet6_cork *v6_cork);
901 struct sk_buff *ip6_make_skb(struct sock *sk,
902 int getfrag(void *from, char *to, int offset,
903 int len, int odd, struct sk_buff *skb),
904 void *from, int length, int transhdrlen,
905 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
906 struct rt6_info *rt, unsigned int flags,
907 const struct sockcm_cookie *sockc);
908
909 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
910 {
911 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
912 &inet6_sk(sk)->cork);
913 }
914
915 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
916 struct flowi6 *fl6);
917 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
918 const struct in6_addr *final_dst);
919 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
920 const struct in6_addr *final_dst);
921 struct dst_entry *ip6_blackhole_route(struct net *net,
922 struct dst_entry *orig_dst);
923
924 /*
925 * skb processing functions
926 */
927
928 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
929 int ip6_forward(struct sk_buff *skb);
930 int ip6_input(struct sk_buff *skb);
931 int ip6_mc_input(struct sk_buff *skb);
932
933 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
934 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
935
936 /*
937 * Extension header (options) processing
938 */
939
940 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
941 u8 *proto, struct in6_addr **daddr_p);
942 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
943 u8 *proto);
944
945 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
946 __be16 *frag_offp);
947
948 bool ipv6_ext_hdr(u8 nexthdr);
949
950 enum {
951 IP6_FH_F_FRAG = (1 << 0),
952 IP6_FH_F_AUTH = (1 << 1),
953 IP6_FH_F_SKIP_RH = (1 << 2),
954 };
955
956 /* find specified header and get offset to it */
957 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
958 unsigned short *fragoff, int *fragflg);
959
960 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
961
962 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
963 const struct ipv6_txoptions *opt,
964 struct in6_addr *orig);
965
966 /*
967 * socket options (ipv6_sockglue.c)
968 */
969
970 int ipv6_setsockopt(struct sock *sk, int level, int optname,
971 char __user *optval, unsigned int optlen);
972 int ipv6_getsockopt(struct sock *sk, int level, int optname,
973 char __user *optval, int __user *optlen);
974 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
975 char __user *optval, unsigned int optlen);
976 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
977 char __user *optval, int __user *optlen);
978
979 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
980 int addr_len);
981 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
982 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
983 int addr_len);
984 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
985 void ip6_datagram_release_cb(struct sock *sk);
986
987 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
988 int *addr_len);
989 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
990 int *addr_len);
991 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
992 u32 info, u8 *payload);
993 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
994 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
995
996 int inet6_release(struct socket *sock);
997 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
998 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
999 int peer);
1000 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1001
1002 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1003 struct sock *sk);
1004
1005 /*
1006 * reassembly.c
1007 */
1008 extern const struct proto_ops inet6_stream_ops;
1009 extern const struct proto_ops inet6_dgram_ops;
1010 extern const struct proto_ops inet6_sockraw_ops;
1011
1012 struct group_source_req;
1013 struct group_filter;
1014
1015 int ip6_mc_source(int add, int omode, struct sock *sk,
1016 struct group_source_req *pgsr);
1017 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1018 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1019 struct group_filter __user *optval, int __user *optlen);
1020
1021 #ifdef CONFIG_PROC_FS
1022 int ac6_proc_init(struct net *net);
1023 void ac6_proc_exit(struct net *net);
1024 int raw6_proc_init(void);
1025 void raw6_proc_exit(void);
1026 int tcp6_proc_init(struct net *net);
1027 void tcp6_proc_exit(struct net *net);
1028 int udp6_proc_init(struct net *net);
1029 void udp6_proc_exit(struct net *net);
1030 int udplite6_proc_init(void);
1031 void udplite6_proc_exit(void);
1032 int ipv6_misc_proc_init(void);
1033 void ipv6_misc_proc_exit(void);
1034 int snmp6_register_dev(struct inet6_dev *idev);
1035 int snmp6_unregister_dev(struct inet6_dev *idev);
1036
1037 #else
1038 static inline int ac6_proc_init(struct net *net) { return 0; }
1039 static inline void ac6_proc_exit(struct net *net) { }
1040 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1041 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1042 #endif
1043
1044 #ifdef CONFIG_SYSCTL
1045 extern struct ctl_table ipv6_route_table_template[];
1046
1047 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1048 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1049 int ipv6_sysctl_register(void);
1050 void ipv6_sysctl_unregister(void);
1051 #endif
1052
1053 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1054 const struct in6_addr *addr);
1055 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1056 const struct in6_addr *addr);
1057 #endif /* _NET_IPV6_H */
Linux with added FPC-III support