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netlabel: Implement CALIPSO config functions for SMACK.
[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_BH(net, idev,field) \
171 _DEVINC(net, ipv6, 64_BH, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64, idev, field, val)
174 #define IP6_ADD_STATS_BH(net, idev,field,val) \
175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64, idev, field, val)
178 #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define ICMP6_INC_STATS_BH(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
184
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
189 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
191
192 struct ip6_ra_chain {
193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197 };
198
199 extern struct ip6_ra_chain *ip6_ra_chain;
200 extern rwlock_t ip6_ra_lock;
201
202 /*
203 This structure is prepared by protocol, when parsing
204 ancillary data and passed to IPv6.
205 */
206
207 struct ipv6_txoptions {
208 atomic_t refcnt;
209 /* Length of this structure */
210 int tot_len;
211
212 /* length of extension headers */
213
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
216
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
220 struct ipv6_opt_hdr *dst1opt;
221 struct rcu_head rcu;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223 };
224
225 struct ip6_flowlabel {
226 struct ip6_flowlabel __rcu *next;
227 __be32 label;
228 atomic_t users;
229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
231 unsigned long linger;
232 struct rcu_head rcu;
233 u8 share;
234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
238 unsigned long lastuse;
239 unsigned long expires;
240 struct net *fl_net;
241 };
242
243 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245 #define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
246
247 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
248 #define IPV6_TCLASS_SHIFT 20
249
250 struct ipv6_fl_socklist {
251 struct ipv6_fl_socklist __rcu *next;
252 struct ip6_flowlabel *fl;
253 struct rcu_head rcu;
254 };
255
256 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
257 {
258 struct ipv6_txoptions *opt;
259
260 rcu_read_lock();
261 opt = rcu_dereference(np->opt);
262 if (opt) {
263 if (!atomic_inc_not_zero(&opt->refcnt))
264 opt = NULL;
265 else
266 opt = rcu_pointer_handoff(opt);
267 }
268 rcu_read_unlock();
269 return opt;
270 }
271
272 static inline void txopt_put(struct ipv6_txoptions *opt)
273 {
274 if (opt && atomic_dec_and_test(&opt->refcnt))
275 kfree_rcu(opt, rcu);
276 }
277
278 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
279 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
280 struct ip6_flowlabel *fl,
281 struct ipv6_txoptions *fopt);
282 void fl6_free_socklist(struct sock *sk);
283 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
284 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
285 int flags);
286 int ip6_flowlabel_init(void);
287 void ip6_flowlabel_cleanup(void);
288
289 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
290 {
291 if (fl)
292 atomic_dec(&fl->users);
293 }
294
295 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
296
297 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
298 struct icmp6hdr *thdr, int len);
299
300 int ip6_ra_control(struct sock *sk, int sel);
301
302 int ipv6_parse_hopopts(struct sk_buff *skb);
303
304 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
305 struct ipv6_txoptions *opt);
306 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
307 struct ipv6_txoptions *opt,
308 int newtype,
309 struct ipv6_opt_hdr __user *newopt,
310 int newoptlen);
311 struct ipv6_txoptions *
312 ipv6_renew_options_kern(struct sock *sk,
313 struct ipv6_txoptions *opt,
314 int newtype,
315 struct ipv6_opt_hdr *newopt,
316 int newoptlen);
317 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
318 struct ipv6_txoptions *opt);
319
320 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
321 const struct inet6_skb_parm *opt);
322 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
323 struct ipv6_txoptions *opt);
324
325 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
326 {
327 /* If forwarding is enabled, RA are not accepted unless the special
328 * hybrid mode (accept_ra=2) is enabled.
329 */
330 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
331 idev->cnf.accept_ra;
332 }
333
334 #if IS_ENABLED(CONFIG_IPV6)
335 static inline int ip6_frag_mem(struct net *net)
336 {
337 return sum_frag_mem_limit(&net->ipv6.frags);
338 }
339 #endif
340
341 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
342 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
343 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
344
345 int __ipv6_addr_type(const struct in6_addr *addr);
346 static inline int ipv6_addr_type(const struct in6_addr *addr)
347 {
348 return __ipv6_addr_type(addr) & 0xffff;
349 }
350
351 static inline int ipv6_addr_scope(const struct in6_addr *addr)
352 {
353 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
354 }
355
356 static inline int __ipv6_addr_src_scope(int type)
357 {
358 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
359 }
360
361 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
362 {
363 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
364 }
365
366 static inline bool __ipv6_addr_needs_scope_id(int type)
367 {
368 return type & IPV6_ADDR_LINKLOCAL ||
369 (type & IPV6_ADDR_MULTICAST &&
370 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
371 }
372
373 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
374 {
375 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
376 }
377
378 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
379 {
380 return memcmp(a1, a2, sizeof(struct in6_addr));
381 }
382
383 static inline bool
384 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
385 const struct in6_addr *a2)
386 {
387 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
388 const unsigned long *ul1 = (const unsigned long *)a1;
389 const unsigned long *ulm = (const unsigned long *)m;
390 const unsigned long *ul2 = (const unsigned long *)a2;
391
392 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
393 ((ul1[1] ^ ul2[1]) & ulm[1]));
394 #else
395 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
396 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
397 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
398 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
399 #endif
400 }
401
402 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
403 const struct in6_addr *addr,
404 int plen)
405 {
406 /* caller must guarantee 0 <= plen <= 128 */
407 int o = plen >> 3,
408 b = plen & 0x7;
409
410 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
411 memcpy(pfx->s6_addr, addr, o);
412 if (b != 0)
413 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
414 }
415
416 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
417 const struct in6_addr *pfx,
418 int plen)
419 {
420 /* caller must guarantee 0 <= plen <= 128 */
421 int o = plen >> 3,
422 b = plen & 0x7;
423
424 memcpy(addr->s6_addr, pfx, o);
425 if (b != 0) {
426 addr->s6_addr[o] &= ~(0xff00 >> b);
427 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
428 }
429 }
430
431 static inline void __ipv6_addr_set_half(__be32 *addr,
432 __be32 wh, __be32 wl)
433 {
434 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
435 #if defined(__BIG_ENDIAN)
436 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
437 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
438 return;
439 }
440 #elif defined(__LITTLE_ENDIAN)
441 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
442 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
443 return;
444 }
445 #endif
446 #endif
447 addr[0] = wh;
448 addr[1] = wl;
449 }
450
451 static inline void ipv6_addr_set(struct in6_addr *addr,
452 __be32 w1, __be32 w2,
453 __be32 w3, __be32 w4)
454 {
455 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
456 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
457 }
458
459 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
460 const struct in6_addr *a2)
461 {
462 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
463 const unsigned long *ul1 = (const unsigned long *)a1;
464 const unsigned long *ul2 = (const unsigned long *)a2;
465
466 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
467 #else
468 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
469 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
470 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
471 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
472 #endif
473 }
474
475 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
476 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
477 const __be64 *a2,
478 unsigned int len)
479 {
480 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
481 return false;
482 return true;
483 }
484
485 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
486 const struct in6_addr *addr2,
487 unsigned int prefixlen)
488 {
489 const __be64 *a1 = (const __be64 *)addr1;
490 const __be64 *a2 = (const __be64 *)addr2;
491
492 if (prefixlen >= 64) {
493 if (a1[0] ^ a2[0])
494 return false;
495 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
496 }
497 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
498 }
499 #else
500 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
501 const struct in6_addr *addr2,
502 unsigned int prefixlen)
503 {
504 const __be32 *a1 = addr1->s6_addr32;
505 const __be32 *a2 = addr2->s6_addr32;
506 unsigned int pdw, pbi;
507
508 /* check complete u32 in prefix */
509 pdw = prefixlen >> 5;
510 if (pdw && memcmp(a1, a2, pdw << 2))
511 return false;
512
513 /* check incomplete u32 in prefix */
514 pbi = prefixlen & 0x1f;
515 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
516 return false;
517
518 return true;
519 }
520 #endif
521
522 struct inet_frag_queue;
523
524 enum ip6_defrag_users {
525 IP6_DEFRAG_LOCAL_DELIVER,
526 IP6_DEFRAG_CONNTRACK_IN,
527 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
528 IP6_DEFRAG_CONNTRACK_OUT,
529 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
530 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
531 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
532 };
533
534 struct ip6_create_arg {
535 __be32 id;
536 u32 user;
537 const struct in6_addr *src;
538 const struct in6_addr *dst;
539 int iif;
540 u8 ecn;
541 };
542
543 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
544 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
545
546 /*
547 * Equivalent of ipv4 struct ip
548 */
549 struct frag_queue {
550 struct inet_frag_queue q;
551
552 __be32 id; /* fragment id */
553 u32 user;
554 struct in6_addr saddr;
555 struct in6_addr daddr;
556
557 int iif;
558 unsigned int csum;
559 __u16 nhoffset;
560 u8 ecn;
561 };
562
563 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
564 struct inet_frags *frags);
565
566 static inline bool ipv6_addr_any(const struct in6_addr *a)
567 {
568 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
569 const unsigned long *ul = (const unsigned long *)a;
570
571 return (ul[0] | ul[1]) == 0UL;
572 #else
573 return (a->s6_addr32[0] | a->s6_addr32[1] |
574 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
575 #endif
576 }
577
578 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
579 {
580 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
581 const unsigned long *ul = (const unsigned long *)a;
582 unsigned long x = ul[0] ^ ul[1];
583
584 return (u32)(x ^ (x >> 32));
585 #else
586 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
587 a->s6_addr32[2] ^ a->s6_addr32[3]);
588 #endif
589 }
590
591 /* more secured version of ipv6_addr_hash() */
592 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
593 {
594 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
595
596 return jhash_3words(v,
597 (__force u32)a->s6_addr32[2],
598 (__force u32)a->s6_addr32[3],
599 initval);
600 }
601
602 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
603 {
604 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
605 const __be64 *be = (const __be64 *)a;
606
607 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
608 #else
609 return (a->s6_addr32[0] | a->s6_addr32[1] |
610 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
611 #endif
612 }
613
614 /*
615 * Note that we must __force cast these to unsigned long to make sparse happy,
616 * since all of the endian-annotated types are fixed size regardless of arch.
617 */
618 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
619 {
620 return (
621 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
622 *(unsigned long *)a |
623 #else
624 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
625 #endif
626 (__force unsigned long)(a->s6_addr32[2] ^
627 cpu_to_be32(0x0000ffff))) == 0UL;
628 }
629
630 /*
631 * Check for a RFC 4843 ORCHID address
632 * (Overlay Routable Cryptographic Hash Identifiers)
633 */
634 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
635 {
636 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
637 }
638
639 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
640 {
641 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
642 }
643
644 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
645 struct in6_addr *v4mapped)
646 {
647 ipv6_addr_set(v4mapped,
648 0, 0,
649 htonl(0x0000FFFF),
650 addr);
651 }
652
653 /*
654 * find the first different bit between two addresses
655 * length of address must be a multiple of 32bits
656 */
657 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
658 {
659 const __be32 *a1 = token1, *a2 = token2;
660 int i;
661
662 addrlen >>= 2;
663
664 for (i = 0; i < addrlen; i++) {
665 __be32 xb = a1[i] ^ a2[i];
666 if (xb)
667 return i * 32 + 31 - __fls(ntohl(xb));
668 }
669
670 /*
671 * we should *never* get to this point since that
672 * would mean the addrs are equal
673 *
674 * However, we do get to it 8) And exacly, when
675 * addresses are equal 8)
676 *
677 * ip route add 1111::/128 via ...
678 * ip route add 1111::/64 via ...
679 * and we are here.
680 *
681 * Ideally, this function should stop comparison
682 * at prefix length. It does not, but it is still OK,
683 * if returned value is greater than prefix length.
684 * --ANK (980803)
685 */
686 return addrlen << 5;
687 }
688
689 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
690 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
691 {
692 const __be64 *a1 = token1, *a2 = token2;
693 int i;
694
695 addrlen >>= 3;
696
697 for (i = 0; i < addrlen; i++) {
698 __be64 xb = a1[i] ^ a2[i];
699 if (xb)
700 return i * 64 + 63 - __fls(be64_to_cpu(xb));
701 }
702
703 return addrlen << 6;
704 }
705 #endif
706
707 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
708 {
709 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
710 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
711 return __ipv6_addr_diff64(token1, token2, addrlen);
712 #endif
713 return __ipv6_addr_diff32(token1, token2, addrlen);
714 }
715
716 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
717 {
718 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
719 }
720
721 __be32 ipv6_select_ident(struct net *net,
722 const struct in6_addr *daddr,
723 const struct in6_addr *saddr);
724 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
725
726 int ip6_dst_hoplimit(struct dst_entry *dst);
727
728 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
729 struct dst_entry *dst)
730 {
731 int hlimit;
732
733 if (ipv6_addr_is_multicast(&fl6->daddr))
734 hlimit = np->mcast_hops;
735 else
736 hlimit = np->hop_limit;
737 if (hlimit < 0)
738 hlimit = ip6_dst_hoplimit(dst);
739 return hlimit;
740 }
741
742 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
743 * Equivalent to : flow->v6addrs.src = iph->saddr;
744 * flow->v6addrs.dst = iph->daddr;
745 */
746 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
747 const struct ipv6hdr *iph)
748 {
749 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
750 offsetof(typeof(flow->addrs), v6addrs.src) +
751 sizeof(flow->addrs.v6addrs.src));
752 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
753 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
754 }
755
756 #if IS_ENABLED(CONFIG_IPV6)
757
758 /* Sysctl settings for net ipv6.auto_flowlabels */
759 #define IP6_AUTO_FLOW_LABEL_OFF 0
760 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
761 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
762 #define IP6_AUTO_FLOW_LABEL_FORCED 3
763
764 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
765
766 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
767
768 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
769 __be32 flowlabel, bool autolabel,
770 struct flowi6 *fl6)
771 {
772 u32 hash;
773
774 if (flowlabel ||
775 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
776 (!autolabel &&
777 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
778 return flowlabel;
779
780 hash = skb_get_hash_flowi6(skb, fl6);
781
782 /* Since this is being sent on the wire obfuscate hash a bit
783 * to minimize possbility that any useful information to an
784 * attacker is leaked. Only lower 20 bits are relevant.
785 */
786 rol32(hash, 16);
787
788 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
789
790 if (net->ipv6.sysctl.flowlabel_state_ranges)
791 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
792
793 return flowlabel;
794 }
795
796 static inline int ip6_default_np_autolabel(struct net *net)
797 {
798 switch (net->ipv6.sysctl.auto_flowlabels) {
799 case IP6_AUTO_FLOW_LABEL_OFF:
800 case IP6_AUTO_FLOW_LABEL_OPTIN:
801 default:
802 return 0;
803 case IP6_AUTO_FLOW_LABEL_OPTOUT:
804 case IP6_AUTO_FLOW_LABEL_FORCED:
805 return 1;
806 }
807 }
808 #else
809 static inline void ip6_set_txhash(struct sock *sk) { }
810 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
811 __be32 flowlabel, bool autolabel,
812 struct flowi6 *fl6)
813 {
814 return flowlabel;
815 }
816 static inline int ip6_default_np_autolabel(struct net *net)
817 {
818 return 0;
819 }
820 #endif
821
822
823 /*
824 * Header manipulation
825 */
826 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
827 __be32 flowlabel)
828 {
829 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
830 }
831
832 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
833 {
834 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
835 }
836
837 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
838 {
839 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
840 }
841
842 static inline u8 ip6_tclass(__be32 flowinfo)
843 {
844 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
845 }
846
847 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
848 {
849 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
850 }
851
852 /*
853 * Prototypes exported by ipv6
854 */
855
856 /*
857 * rcv function (called from netdevice level)
858 */
859
860 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
861 struct packet_type *pt, struct net_device *orig_dev);
862
863 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
864
865 /*
866 * upper-layer output functions
867 */
868 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
869 struct ipv6_txoptions *opt, int tclass);
870
871 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
872
873 int ip6_append_data(struct sock *sk,
874 int getfrag(void *from, char *to, int offset, int len,
875 int odd, struct sk_buff *skb),
876 void *from, int length, int transhdrlen, int hlimit,
877 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
878 struct rt6_info *rt, unsigned int flags, int dontfrag);
879
880 int ip6_push_pending_frames(struct sock *sk);
881
882 void ip6_flush_pending_frames(struct sock *sk);
883
884 int ip6_send_skb(struct sk_buff *skb);
885
886 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
887 struct inet_cork_full *cork,
888 struct inet6_cork *v6_cork);
889 struct sk_buff *ip6_make_skb(struct sock *sk,
890 int getfrag(void *from, char *to, int offset,
891 int len, int odd, struct sk_buff *skb),
892 void *from, int length, int transhdrlen,
893 int hlimit, int tclass, struct ipv6_txoptions *opt,
894 struct flowi6 *fl6, struct rt6_info *rt,
895 unsigned int flags, int dontfrag);
896
897 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
898 {
899 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
900 &inet6_sk(sk)->cork);
901 }
902
903 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
904 struct flowi6 *fl6);
905 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
906 const struct in6_addr *final_dst);
907 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
908 const struct in6_addr *final_dst);
909 struct dst_entry *ip6_blackhole_route(struct net *net,
910 struct dst_entry *orig_dst);
911
912 /*
913 * skb processing functions
914 */
915
916 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
917 int ip6_forward(struct sk_buff *skb);
918 int ip6_input(struct sk_buff *skb);
919 int ip6_mc_input(struct sk_buff *skb);
920
921 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
922 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
923
924 /*
925 * Extension header (options) processing
926 */
927
928 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
929 u8 *proto, struct in6_addr **daddr_p);
930 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
931 u8 *proto);
932
933 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
934 __be16 *frag_offp);
935
936 bool ipv6_ext_hdr(u8 nexthdr);
937
938 enum {
939 IP6_FH_F_FRAG = (1 << 0),
940 IP6_FH_F_AUTH = (1 << 1),
941 IP6_FH_F_SKIP_RH = (1 << 2),
942 };
943
944 /* find specified header and get offset to it */
945 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
946 unsigned short *fragoff, int *fragflg);
947
948 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
949
950 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
951 const struct ipv6_txoptions *opt,
952 struct in6_addr *orig);
953
954 /*
955 * socket options (ipv6_sockglue.c)
956 */
957
958 int ipv6_setsockopt(struct sock *sk, int level, int optname,
959 char __user *optval, unsigned int optlen);
960 int ipv6_getsockopt(struct sock *sk, int level, int optname,
961 char __user *optval, int __user *optlen);
962 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
963 char __user *optval, unsigned int optlen);
964 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
965 char __user *optval, int __user *optlen);
966
967 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
968 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
969 int addr_len);
970
971 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
972 int *addr_len);
973 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
974 int *addr_len);
975 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
976 u32 info, u8 *payload);
977 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
978 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
979
980 int inet6_release(struct socket *sock);
981 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
982 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
983 int peer);
984 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
985
986 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
987 struct sock *sk);
988
989 /*
990 * reassembly.c
991 */
992 extern const struct proto_ops inet6_stream_ops;
993 extern const struct proto_ops inet6_dgram_ops;
994
995 struct group_source_req;
996 struct group_filter;
997
998 int ip6_mc_source(int add, int omode, struct sock *sk,
999 struct group_source_req *pgsr);
1000 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1001 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1002 struct group_filter __user *optval, int __user *optlen);
1003
1004 #ifdef CONFIG_PROC_FS
1005 int ac6_proc_init(struct net *net);
1006 void ac6_proc_exit(struct net *net);
1007 int raw6_proc_init(void);
1008 void raw6_proc_exit(void);
1009 int tcp6_proc_init(struct net *net);
1010 void tcp6_proc_exit(struct net *net);
1011 int udp6_proc_init(struct net *net);
1012 void udp6_proc_exit(struct net *net);
1013 int udplite6_proc_init(void);
1014 void udplite6_proc_exit(void);
1015 int ipv6_misc_proc_init(void);
1016 void ipv6_misc_proc_exit(void);
1017 int snmp6_register_dev(struct inet6_dev *idev);
1018 int snmp6_unregister_dev(struct inet6_dev *idev);
1019
1020 #else
1021 static inline int ac6_proc_init(struct net *net) { return 0; }
1022 static inline void ac6_proc_exit(struct net *net) { }
1023 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1024 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1025 #endif
1026
1027 #ifdef CONFIG_SYSCTL
1028 extern struct ctl_table ipv6_route_table_template[];
1029
1030 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1031 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1032 int ipv6_sysctl_register(void);
1033 void ipv6_sysctl_unregister(void);
1034 #endif
1035
1036 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1037 const struct in6_addr *addr);
1038 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1039 const struct in6_addr *addr);
1040 #endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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