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net: ping: do not abuse udp_poll()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / ipv6.h
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
1da177e4
LT		 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>
08dcdbf6 18#include <linux/jhash.h>
20283d84 19#include <net/if_inet6.h>
1da177e4
LT		 20#include <net/ndisc.h>
21#include <net/flow.h>
22#include <net/snmp.h>
23
24#define SIN6_LEN_RFC2133 24
25
26#define IPV6_MAXPLEN 65535
27
28/*
29 * NextHeader field of IPv6 header
30 */
31
32#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33#define NEXTHDR_TCP 6 /* TCP segment. */
34#define NEXTHDR_UDP 17 /* UDP message. */
35#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
36#define NEXTHDR_ROUTING 43 /* Routing header. */
37#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
c12b395a 38#define NEXTHDR_GRE 47 /* GRE header. */
1da177e4
LT		 39#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
40#define NEXTHDR_AUTH 51 /* Authentication header. */
41#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
42#define NEXTHDR_NONE 59 /* No next header */
43#define NEXTHDR_DEST 60 /* Destination options header. */
2b741653 44#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4
LT		 45
46#define NEXTHDR_MAX 255
47
48
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
1da177e4
LT		 78
79/*
80 * Addr scopes
81 */
1da177e4
LT		 82#define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84#define __IPV6_ADDR_SCOPE_INVALID -1
1da177e4
LT		 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
5ced1339
LL		 91/*
92 * Addr flags
93 */
5ced1339
LL		 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)
5ced1339 100
1da177e4
LT		 101/*
102 * fragmentation header
103 */
104
105struct frag_hdr {
44473a6b
AV		 106 __u8 nexthdr;
107 __u8 reserved;
108 __be16 frag_off;
109 __be32 identification;
1da177e4
LT		 110};
111
112#define IP6_MF 0x0001
113
1da177e4
LT		 114#include <net/sock.h>
115
116/* sysctls */
1da177e4 117extern int sysctl_mld_max_msf;
3d7cc2ba 118
087fe240 119#define _DEVINC(net, statname, modifier, idev, field) \
14878f75 120({ \
a11d206d
YH		 121 struct inet6_dev *_idev = (idev); \
122 if (likely(_idev != NULL)) \
14878f75 123 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
9261e537 124 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
a11d206d 125})
14878f75 126
be281e55
ED		 127/* per device counters are atomic_long_t */
128#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
129({ \
130 struct inet6_dev *_idev = (idev); \
131 if (likely(_idev != NULL)) \
132 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
133 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
134})
135
2a24444f
ED		 136/* per device and per net counters are atomic_long_t */
137#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
138({ \
139 struct inet6_dev *_idev = (idev); \
140 if (likely(_idev != NULL)) \
141 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
142 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
143})
144
087fe240 145#define _DEVADD(net, statname, modifier, idev, field, val) \
8e7999c4
PE		 146({ \
147 struct inet6_dev *_idev = (idev); \
148 if (likely(_idev != NULL)) \
149 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
9261e537 150 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
8e7999c4
PE		 151})
152
edf391ff
NH		 153#define _DEVUPD(net, statname, modifier, idev, field, val) \
154({ \
155 struct inet6_dev *_idev = (idev); \
156 if (likely(_idev != NULL)) \
157 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
158 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
159})
160
14878f75 161/* MIBs */
14878f75 162
087fe240 163#define IP6_INC_STATS(net, idev,field) \
4ce3c183 164 _DEVINC(net, ipv6, 64, idev, field)
087fe240 165#define IP6_INC_STATS_BH(net, idev,field) \
4ce3c183 166 _DEVINC(net, ipv6, 64_BH, idev, field)
edf391ff 167#define IP6_ADD_STATS(net, idev,field,val) \
4ce3c183 168 _DEVADD(net, ipv6, 64, idev, field, val)
087fe240 169#define IP6_ADD_STATS_BH(net, idev,field,val) \
4ce3c183 170 _DEVADD(net, ipv6, 64_BH, idev, field, val)
edf391ff 171#define IP6_UPD_PO_STATS(net, idev,field,val) \
4ce3c183 172 _DEVUPD(net, ipv6, 64, idev, field, val)
edf391ff 173#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
4ce3c183 174 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
087fe240 175#define ICMP6_INC_STATS(net, idev, field) \
be281e55 176 _DEVINCATOMIC(net, icmpv6, , idev, field)
087fe240 177#define ICMP6_INC_STATS_BH(net, idev, field) \
be281e55 178 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
087fe240
DL		 179
180#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
2a24444f 181 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
087fe240 182#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
2a24444f 183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
087fe240 184#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
2a24444f 185 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
14878f75 186
fd2c3ef7 187struct ip6_ra_chain {
1da177e4
LT		 188 struct ip6_ra_chain *next;
189 struct sock *sk;
190 int sel;
191 void (*destructor)(struct sock *);
192};
193
194extern struct ip6_ra_chain *ip6_ra_chain;
195extern rwlock_t ip6_ra_lock;
196
197/*
198 This structure is prepared by protocol, when parsing
199 ancillary data and passed to IPv6.
200 */
201
fd2c3ef7 202struct ipv6_txoptions {
1da177e4
LT		 203 /* Length of this structure */
204 int tot_len;
205
206 /* length of extension headers */
207
208 __u16 opt_flen; /* after fragment hdr */
209 __u16 opt_nflen; /* before fragment hdr */
210
211 struct ipv6_opt_hdr *hopopt;
212 struct ipv6_opt_hdr *dst0opt;
213 struct ipv6_rt_hdr *srcrt; /* Routing Header */
1da177e4
LT		 214 struct ipv6_opt_hdr *dst1opt;
215
216 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
217};
218
fd2c3ef7 219struct ip6_flowlabel {
7f0e44ac 220 struct ip6_flowlabel __rcu *next;
90bcaf7b 221 __be32 label;
db3459d1 222 atomic_t users;
1da177e4
LT		 223 struct in6_addr dst;
224 struct ipv6_txoptions *opt;
1da177e4 225 unsigned long linger;
d3aedd5e 226 struct rcu_head rcu;
1da177e4 227 u8 share;
4f82f457
EB		 228 union {
229 struct pid *pid;
230 kuid_t uid;
231 } owner;
1da177e4
LT		 232 unsigned long lastuse;
233 unsigned long expires;
60e8fbc4 234 struct net *fl_net;
1da177e4
LT		 235};
236
f3a7c66b
HH		 237#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
238#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
1da177e4 239
fd2c3ef7 240struct ipv6_fl_socklist {
7f0e44ac
ED		 241 struct ipv6_fl_socklist __rcu *next;
242 struct ip6_flowlabel *fl;
243 struct rcu_head rcu;
1da177e4
LT		 244};
245
90bcaf7b 246extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
1da177e4
LT		 247extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
248 struct ip6_flowlabel * fl,
249 struct ipv6_txoptions * fopt);
250extern void fl6_free_socklist(struct sock *sk);
251extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
0a3e78ac 252extern int ip6_flowlabel_init(void);
1da177e4
LT		 253extern void ip6_flowlabel_cleanup(void);
254
255static inline void fl6_sock_release(struct ip6_flowlabel *fl)
256{
257 if (fl)
258 atomic_dec(&fl->users);
259}
260
b94f1c09
DM		 261extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
262
725a8ff0 263extern int ip6_ra_control(struct sock *sk, int sel);
1da177e4 264
e5bbef20 265extern int ipv6_parse_hopopts(struct sk_buff *skb);
1da177e4
LT		 266
267extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
333fad53
YH		 268extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
269 int newtype,
270 struct ipv6_opt_hdr __user *newopt,
271 int newoptlen);
df9890c3
YH		 272struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
273 struct ipv6_txoptions *opt);
1da177e4 274
92113bfd 275extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
399c07de 276
aeaf6e9d
SL		 277static inline bool ipv6_accept_ra(struct inet6_dev *idev)
278{
279 /* If forwarding is enabled, RA are not accepted unless the special
280 * hybrid mode (accept_ra=2) is enabled.
281 */
282 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
283 idev->cnf.accept_ra;
284}
285
d4915c08
AW		 286#if IS_ENABLED(CONFIG_IPV6)
287static inline int ip6_frag_nqueues(struct net *net)
288{
289 return net->ipv6.frags.nqueues;
290}
291
292static inline int ip6_frag_mem(struct net *net)
293{
d433673e 294 return sum_frag_mem_limit(&net->ipv6.frags);
d4915c08
AW		 295}
296#endif
1da177e4 297
c2a93660
JDB		 298#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
299#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
9874c41c 300#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
1da177e4 301
b1cacb68
YH		 302extern int __ipv6_addr_type(const struct in6_addr *addr);
303static inline int ipv6_addr_type(const struct in6_addr *addr)
304{
305 return __ipv6_addr_type(addr) & 0xffff;
306}
1da177e4
LT		 307
308static inline int ipv6_addr_scope(const struct in6_addr *addr)
309{
b1cacb68
YH		 310 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
311}
312
313static inline int __ipv6_addr_src_scope(int type)
314{
a02cec21 315 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
b1cacb68
YH		 316}
317
318static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
319{
320 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 321}
322
b7ef213e
HFS		 323static inline bool __ipv6_addr_needs_scope_id(int type)
324{
325 return type & IPV6_ADDR_LINKLOCAL ||
326 (type & IPV6_ADDR_MULTICAST &&
327 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
328}
329
330static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
331{
332 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
333}
334
1da177e4
LT		 335static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
336{
db3459d1 337 return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 338}
339
1a203cb3 340static inline bool
f2ffd9ee
PM		 341ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
342 const struct in6_addr *a2)
343{
1a203cb3
ED		 344#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
345 const unsigned long *ul1 = (const unsigned long *)a1;
346 const unsigned long *ulm = (const unsigned long *)m;
347 const unsigned long *ul2 = (const unsigned long *)a2;
348
349 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
350 ((ul1[1] ^ ul2[1]) & ulm[1]));
351#else
a02cec21
ED		 352 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
353 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
354 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
355 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
1a203cb3 356#endif
f2ffd9ee
PM		 357}
358
1da177e4
LT		 359static inline void ipv6_addr_prefix(struct in6_addr *pfx,
360 const struct in6_addr *addr,
361 int plen)
362{
363 /* caller must guarantee 0 <= plen <= 128 */
364 int o = plen >> 3,
365 b = plen & 0x7;
366
db3459d1 367 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4 368 memcpy(pfx->s6_addr, addr, o);
db3459d1 369 if (b != 0)
1da177e4 370 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4
LT		 371}
372
5206c579
YH		 373static inline void __ipv6_addr_set_half(__be32 *addr,
374 __be32 wh, __be32 wl)
375{
376#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
377#if defined(__BIG_ENDIAN)
378 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
379 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
380 return;
381 }
382#elif defined(__LITTLE_ENDIAN)
383 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
384 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
385 return;
386 }
387#endif
388#endif
389 addr[0] = wh;
390 addr[1] = wl;
391}
392
1da177e4 393static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 394 __be32 w1, __be32 w2,
395 __be32 w3, __be32 w4)
1da177e4 396{
5206c579
YH		 397 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
398 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
1da177e4 399}
1da177e4 400
92113bfd
ED		 401static inline bool ipv6_addr_equal(const struct in6_addr *a1,
402 const struct in6_addr *a2)
1da177e4 403{
1a203cb3
ED		 404#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
405 const unsigned long *ul1 = (const unsigned long *)a1;
406 const unsigned long *ul2 = (const unsigned long *)a2;
407
408 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
409#else
a02cec21
ED		 410 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
411 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
412 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
413 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
1a203cb3 414#endif
1da177e4
LT		 415}
416
38675170
YH		 417#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
418static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
419 const __be64 *a2,
420 unsigned int len)
421{
512613d7 422 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
38675170
YH		 423 return false;
424 return true;
425}
426
427static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
428 const struct in6_addr *addr2,
429 unsigned int prefixlen)
430{
431 const __be64 *a1 = (const __be64 *)addr1;
432 const __be64 *a2 = (const __be64 *)addr2;
433
434 if (prefixlen >= 64) {
435 if (a1[0] ^ a2[0])
436 return false;
437 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
438 }
439 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
440}
441#else
2ef97332
YH		 442static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
443 const struct in6_addr *addr2,
444 unsigned int prefixlen)
1da177e4 445{
2ef97332
YH		 446 const __be32 *a1 = addr1->s6_addr32;
447 const __be32 *a2 = addr2->s6_addr32;
95c96174 448 unsigned int pdw, pbi;
1da177e4
LT		 449
450 /* check complete u32 in prefix */
451 pdw = prefixlen >> 5;
452 if (pdw && memcmp(a1, a2, pdw << 2))
92113bfd 453 return false;
1da177e4
LT		 454
455 /* check incomplete u32 in prefix */
456 pbi = prefixlen & 0x1f;
457 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
92113bfd 458 return false;
1da177e4 459
92113bfd 460 return true;
1da177e4 461}
38675170 462#endif
1da177e4 463
2588fe1d 464struct inet_frag_queue;
2588fe1d 465
0b5ccb2e
PM		 466enum ip6_defrag_users {
467 IP6_DEFRAG_LOCAL_DELIVER,
468 IP6_DEFRAG_CONNTRACK_IN,
4be929be 469 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
0b5ccb2e 470 IP6_DEFRAG_CONNTRACK_OUT,
4be929be 471 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68 472 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be 473 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
0b5ccb2e
PM		 474};
475
c6fda282
PE		 476struct ip6_create_arg {
477 __be32 id;
0b5ccb2e 478 u32 user;
b71d1d42
ED		 479 const struct in6_addr *src;
480 const struct in6_addr *dst;
7cd9f602 481 int iif;
eec2e618 482 u8 ecn;
c6fda282
PE		 483};
484
485void ip6_frag_init(struct inet_frag_queue *q, void *a);
cbc264ca 486bool ip6_frag_match(struct inet_frag_queue *q, void *a);
c6fda282 487
b836c99f
AW		 488/*
489 * Equivalent of ipv4 struct ip
490 */
491struct frag_queue {
492 struct inet_frag_queue q;
493
494 __be32 id; /* fragment id */
495 u32 user;
496 struct in6_addr saddr;
497 struct in6_addr daddr;
498
499 int iif;
500 unsigned int csum;
501 __u16 nhoffset;
eec2e618 502 u8 ecn;
b836c99f
AW		 503};
504
505void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
506 struct inet_frags *frags);
507
92113bfd 508static inline bool ipv6_addr_any(const struct in6_addr *a)
1da177e4 509{
1a203cb3
ED		 510#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
511 const unsigned long *ul = (const unsigned long *)a;
512
513 return (ul[0] | ul[1]) == 0UL;
514#else
a02cec21
ED		 515 return (a->s6_addr32[0] | a->s6_addr32[1] |
516 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
1a203cb3 517#endif
1da177e4
LT		 518}
519
ddbe5032
ED		 520static inline u32 ipv6_addr_hash(const struct in6_addr *a)
521{
522#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
523 const unsigned long *ul = (const unsigned long *)a;
524 unsigned long x = ul[0] ^ ul[1];
525
526 return (u32)(x ^ (x >> 32));
527#else
528 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
529 a->s6_addr32[2] ^ a->s6_addr32[3]);
530#endif
531}
532
08dcdbf6 533/* more secured version of ipv6_addr_hash() */
ff1f69a8 534static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
08dcdbf6
ED		 535{
536 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
537
538 return jhash_3words(v,
539 (__force u32)a->s6_addr32[2],
540 (__force u32)a->s6_addr32[3],
ff1f69a8
ED		 541 initval);
542}
543
544static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
545{
546 return __ipv6_addr_jhash(a, ipv6_hash_secret);
08dcdbf6
ED		 547}
548
92113bfd 549static inline bool ipv6_addr_loopback(const struct in6_addr *a)
f630e43a 550{
e287656b
YH		 551#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
552 const unsigned long *ul = (const unsigned long *)a;
553
554 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
555#else
a02cec21
ED		 556 return (a->s6_addr32[0] | a->s6_addr32[1] |
557 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
e287656b 558#endif
f630e43a
YH		 559}
560
92113bfd 561static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
e773e4fa 562{
a04d40b8
YH		 563 return (
564#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
565 *(__be64 *)a |
566#else
567 (a->s6_addr32[0] | a->s6_addr32[1]) |
568#endif
569 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
e773e4fa
BH		 570}
571
99cd07a5
JMT		 572/*
573 * Check for a RFC 4843 ORCHID address
574 * (Overlay Routable Cryptographic Hash Identifiers)
575 */
92113bfd 576static inline bool ipv6_addr_orchid(const struct in6_addr *a)
99cd07a5 577{
a02cec21 578 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
99cd07a5
JMT		 579}
580
f15364bd
AC		 581static inline void ipv6_addr_set_v4mapped(const __be32 addr,
582 struct in6_addr *v4mapped)
583{
584 ipv6_addr_set(v4mapped,
585 0, 0,
586 htonl(0x0000FFFF),
587 addr);
588}
589
971f359d
YH		 590/*
591 * find the first different bit between two addresses
592 * length of address must be a multiple of 32bits
593 */
9f2e7334 594static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
971f359d 595{
ef296f56 596 const __be32 *a1 = token1, *a2 = token2;
971f359d
YH		 597 int i;
598
599 addrlen >>= 2;
600
601 for (i = 0; i < addrlen; i++) {
ef296f56
AV		 602 __be32 xb = a1[i] ^ a2[i];
603 if (xb)
d57b8fb8 604 return i * 32 + 31 - __fls(ntohl(xb));
971f359d
YH		 605 }
606
607 /*
608 * we should *never* get to this point since that
609 * would mean the addrs are equal
610 *
611 * However, we do get to it 8) And exacly, when
612 * addresses are equal 8)
613 *
614 * ip route add 1111::/128 via ...
615 * ip route add 1111::/64 via ...
616 * and we are here.
617 *
618 * Ideally, this function should stop comparison
619 * at prefix length. It does not, but it is still OK,
620 * if returned value is greater than prefix length.
621 * --ANK (980803)
622 */
a02cec21 623 return addrlen << 5;
971f359d
YH		 624}
625
9f2e7334
YH		 626#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
628{
629 const __be64 *a1 = token1, *a2 = token2;
630 int i;
631
632 addrlen >>= 3;
633
634 for (i = 0; i < addrlen; i++) {
635 __be64 xb = a1[i] ^ a2[i];
636 if (xb)
637 return i * 64 + 63 - __fls(be64_to_cpu(xb));
638 }
639
640 return addrlen << 6;
641}
642#endif
643
644static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
645{
646#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
647 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
648 return __ipv6_addr_diff64(token1, token2, addrlen);
649#endif
650 return __ipv6_addr_diff32(token1, token2, addrlen);
651}
652
971f359d
YH		 653static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
654{
655 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
656}
657
3e4e4c1f
YH		 658/*
659 * Header manipulation
660 */
661static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
662 __be32 flowlabel)
663{
07f623d3 664 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
3e4e4c1f
YH		 665}
666
6502ca52
YH		 667static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
668{
669 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
670}
671
1da177e4
LT		 672/*
673 * Prototypes exported by ipv6
674 */
675
676/*
677 * rcv function (called from netdevice level)
678 */
679
680extern int ipv6_rcv(struct sk_buff *skb,
681 struct net_device *dev,
f2ccd8fa
DM		 682 struct packet_type *pt,
683 struct net_device *orig_dev);
1da177e4 684
b05e1066
PM		 685extern int ip6_rcv_finish(struct sk_buff *skb);
686
1da177e4
LT		 687/*
688 * upper-layer output functions
689 */
690extern int ip6_xmit(struct sock *sk,
691 struct sk_buff *skb,
4c9483b2 692 struct flowi6 *fl6,
b903d324
ED		 693 struct ipv6_txoptions *opt,
694 int tclass);
1da177e4 695
1da177e4
LT		 696extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
697
698extern int ip6_append_data(struct sock *sk,
699 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
700 void *from,
701 int length,
702 int transhdrlen,
703 int hlimit,
41a1f8ea 704 int tclass,
1da177e4 705 struct ipv6_txoptions *opt,
4c9483b2 706 struct flowi6 *fl6,
1da177e4 707 struct rt6_info *rt,
13b52cd4
BH		 708 unsigned int flags,
709 int dontfrag);
1da177e4
LT		 710
711extern int ip6_push_pending_frames(struct sock *sk);
712
713extern void ip6_flush_pending_frames(struct sock *sk);
714
715extern int ip6_dst_lookup(struct sock *sk,
716 struct dst_entry **dst,
4c9483b2 717 struct flowi6 *fl6);
68d0c6d3 718extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
4c9483b2 719 struct flowi6 *fl6,
68d0c6d3 720 const struct in6_addr *final_dst,
a1414715 721 bool can_sleep);
68d0c6d3 722extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
4c9483b2 723 struct flowi6 *fl6,
68d0c6d3 724 const struct in6_addr *final_dst,
a1414715 725 bool can_sleep);
2774c131
DM		 726extern struct dst_entry * ip6_blackhole_route(struct net *net,
727 struct dst_entry *orig_dst);
1da177e4
LT		 728
729/*
730 * skb processing functions
731 */
732
733extern int ip6_output(struct sk_buff *skb);
734extern int ip6_forward(struct sk_buff *skb);
735extern int ip6_input(struct sk_buff *skb);
736extern int ip6_mc_input(struct sk_buff *skb);
737
ef76bc23
HX		 738extern int __ip6_local_out(struct sk_buff *skb);
739extern int ip6_local_out(struct sk_buff *skb);
740
1da177e4
LT		 741/*
742 * Extension header (options) processing
743 */
744
1da177e4
LT		 745extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
746 struct ipv6_txoptions *opt,
747 u8 *proto,
748 struct in6_addr **daddr_p);
749extern void ipv6_push_frag_opts(struct sk_buff *skb,
750 struct ipv6_txoptions *opt,
751 u8 *proto);
752
753extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
75f2811c 754 u8 *nexthdrp, __be16 *frag_offp);
1da177e4 755
a50feda5 756extern bool ipv6_ext_hdr(u8 nexthdr);
1da177e4 757
f8f62675 758enum {
9195bb8e
AA		 759 IP6_FH_F_FRAG = (1 << 0),
760 IP6_FH_F_AUTH = (1 << 1),
761 IP6_FH_F_SKIP_RH = (1 << 2),
f8f62675
JG		 762};
763
764/* find specified header and get offset to it */
765extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
766 int target, unsigned short *fragoff, int *fragflg);
767
c61a4043
MN		 768extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
769
4c9483b2 770extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
20c59de2
AE		 771 const struct ipv6_txoptions *opt,
772 struct in6_addr *orig);
773
1da177e4
LT		 774/*
775 * socket options (ipv6_sockglue.c)
776 */
777
778extern int ipv6_setsockopt(struct sock *sk, int level,
779 int optname,
780 char __user *optval,
b7058842 781 unsigned int optlen);
1da177e4
LT		 782extern int ipv6_getsockopt(struct sock *sk, int level,
783 int optname,
784 char __user *optval,
785 int __user *optlen);
3fdadf7d
DM		 786extern int compat_ipv6_setsockopt(struct sock *sk,
787 int level,
788 int optname,
789 char __user *optval,
b7058842 790 unsigned int optlen);
3fdadf7d
DM		 791extern int compat_ipv6_getsockopt(struct sock *sk,
792 int level,
793 int optname,
794 char __user *optval,
795 int __user *optlen);
1da177e4 796
1da177e4
LT		 797extern int ip6_datagram_connect(struct sock *sk,
798 struct sockaddr *addr, int addr_len);
799
08c62a10
HFS		 800extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
801 int *addr_len);
802extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
803 int *addr_len);
e69a4adc 804extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1da177e4 805 u32 info, u8 *payload);
4c9483b2
DM		 806extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
807extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1da177e4
LT		 808
809extern int inet6_release(struct socket *sock);
810extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
811 int addr_len);
812extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
813 int *uaddr_len, int peer);
814extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
815 unsigned long arg);
816
d8313f5c
ACM		 817extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
818 struct sock *sk);
819
1da177e4
LT		 820/*
821 * reassembly.c
822 */
90ddc4f0
ED		 823extern const struct proto_ops inet6_stream_ops;
824extern const struct proto_ops inet6_dgram_ops;
f7eb769a 825extern const struct proto_ops inet6_sockraw_ops;
20380731 826
14c85021
ACM		 827struct group_source_req;
828struct group_filter;
829
20380731
ACM		 830extern int ip6_mc_source(int add, int omode, struct sock *sk,
831 struct group_source_req *pgsr);
832extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
833extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
834 struct group_filter __user *optval,
835 int __user *optlen);
93c8b90f
IJ		 836extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
837 const struct in6_addr *daddr, u32 rnd);
20380731
ACM		 838
839#ifdef CONFIG_PROC_FS
6ab57e7e
DL		 840extern int ac6_proc_init(struct net *net);
841extern void ac6_proc_exit(struct net *net);
20380731
ACM		 842extern int raw6_proc_init(void);
843extern void raw6_proc_exit(void);
6f8b13bc
DL		 844extern int tcp6_proc_init(struct net *net);
845extern void tcp6_proc_exit(struct net *net);
0c96d8c5
DL		 846extern int udp6_proc_init(struct net *net);
847extern void udp6_proc_exit(struct net *net);
ba4e58ec
GR		 848extern int udplite6_proc_init(void);
849extern void udplite6_proc_exit(void);
20380731
ACM		 850extern int ipv6_misc_proc_init(void);
851extern void ipv6_misc_proc_exit(void);
7f7d9a6b
HX		 852extern int snmp6_register_dev(struct inet6_dev *idev);
853extern int snmp6_unregister_dev(struct inet6_dev *idev);
20380731 854
7f7d9a6b 855#else
6ab57e7e
DL		 856static inline int ac6_proc_init(struct net *net) { return 0; }
857static inline void ac6_proc_exit(struct net *net) { }
858static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
859static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
20380731 860#endif
1da177e4 861
20380731 862#ifdef CONFIG_SYSCTL
760f2d01
DL		 863extern ctl_table ipv6_route_table_template[];
864extern ctl_table ipv6_icmp_table_template[];
1da177e4 865
6de1a910
DL		 866extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
867extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
291480c0 868extern int ipv6_sysctl_register(void);
20380731
ACM		 869extern void ipv6_sysctl_unregister(void);
870#endif
1da177e4 871
20380731 872#endif /* _NET_IPV6_H */
kernel source for telekom puls (alcatel/mediatek)