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Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/bwh/sfc...
[deliverable/linux.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. */
280c571e 44#define NEXTHDR_SCTP 132 /* SCTP message. */
2b741653 45#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4
LT		 46
47#define NEXTHDR_MAX 255
48
49
50
51#define IPV6_DEFAULT_HOPLIMIT 64
52#define IPV6_DEFAULT_MCASTHOPS 1
53
54/*
55 * Addr type
56 *
57 * type - unicast | multicast
58 * scope - local | site | global
59 * v4 - compat
60 * v4mapped
61 * any
62 * loopback
63 */
64
65#define IPV6_ADDR_ANY 0x0000U
66
67#define IPV6_ADDR_UNICAST 0x0001U
68#define IPV6_ADDR_MULTICAST 0x0002U
69
70#define IPV6_ADDR_LOOPBACK 0x0010U
71#define IPV6_ADDR_LINKLOCAL 0x0020U
72#define IPV6_ADDR_SITELOCAL 0x0040U
73
74#define IPV6_ADDR_COMPATv4 0x0080U
75
76#define IPV6_ADDR_SCOPE_MASK 0x00f0U
77
78#define IPV6_ADDR_MAPPED 0x1000U
1da177e4
LT		 79
80/*
81 * Addr scopes
82 */
1da177e4
LT		 83#define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
85#define __IPV6_ADDR_SCOPE_INVALID -1
1da177e4
LT		 86#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
91
5ced1339
LL		 92/*
93 * Addr flags
94 */
5ced1339
LL		 95#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
96 ((a)->s6_addr[1] & 0x10)
97#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
98 ((a)->s6_addr[1] & 0x20)
99#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
100 ((a)->s6_addr[1] & 0x40)
5ced1339 101
1da177e4
LT		 102/*
103 * fragmentation header
104 */
105
106struct frag_hdr {
44473a6b
AV		 107 __u8 nexthdr;
108 __u8 reserved;
109 __be16 frag_off;
110 __be32 identification;
1da177e4
LT		 111};
112
113#define IP6_MF 0x0001
114
1da177e4
LT		 115#include <net/sock.h>
116
117/* sysctls */
1da177e4 118extern int sysctl_mld_max_msf;
3d7cc2ba 119
087fe240 120#define _DEVINC(net, statname, modifier, idev, field) \
14878f75 121({ \
a11d206d
YH		 122 struct inet6_dev *_idev = (idev); \
123 if (likely(_idev != NULL)) \
14878f75 124 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
9261e537 125 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
a11d206d 126})
14878f75 127
be281e55
ED		 128/* per device counters are atomic_long_t */
129#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
130({ \
131 struct inet6_dev *_idev = (idev); \
132 if (likely(_idev != NULL)) \
133 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
134 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
135})
136
2a24444f
ED		 137/* per device and per net counters are atomic_long_t */
138#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
139({ \
140 struct inet6_dev *_idev = (idev); \
141 if (likely(_idev != NULL)) \
142 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
143 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
144})
145
087fe240 146#define _DEVADD(net, statname, modifier, idev, field, val) \
8e7999c4
PE		 147({ \
148 struct inet6_dev *_idev = (idev); \
149 if (likely(_idev != NULL)) \
150 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
9261e537 151 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
8e7999c4
PE		 152})
153
edf391ff
NH		 154#define _DEVUPD(net, statname, modifier, idev, field, val) \
155({ \
156 struct inet6_dev *_idev = (idev); \
157 if (likely(_idev != NULL)) \
158 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
159 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
160})
161
14878f75 162/* MIBs */
14878f75 163
087fe240 164#define IP6_INC_STATS(net, idev,field) \
4ce3c183 165 _DEVINC(net, ipv6, 64, idev, field)
087fe240 166#define IP6_INC_STATS_BH(net, idev,field) \
4ce3c183 167 _DEVINC(net, ipv6, 64_BH, idev, field)
edf391ff 168#define IP6_ADD_STATS(net, idev,field,val) \
4ce3c183 169 _DEVADD(net, ipv6, 64, idev, field, val)
087fe240 170#define IP6_ADD_STATS_BH(net, idev,field,val) \
4ce3c183 171 _DEVADD(net, ipv6, 64_BH, idev, field, val)
edf391ff 172#define IP6_UPD_PO_STATS(net, idev,field,val) \
4ce3c183 173 _DEVUPD(net, ipv6, 64, idev, field, val)
edf391ff 174#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
4ce3c183 175 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
087fe240 176#define ICMP6_INC_STATS(net, idev, field) \
be281e55 177 _DEVINCATOMIC(net, icmpv6, , idev, field)
087fe240 178#define ICMP6_INC_STATS_BH(net, idev, field) \
be281e55 179 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
087fe240
DL		 180
181#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
2a24444f 182 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
087fe240 183#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
2a24444f 184 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
087fe240 185#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
2a24444f 186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
14878f75 187
fd2c3ef7 188struct ip6_ra_chain {
1da177e4
LT		 189 struct ip6_ra_chain *next;
190 struct sock *sk;
191 int sel;
192 void (*destructor)(struct sock *);
193};
194
195extern struct ip6_ra_chain *ip6_ra_chain;
196extern rwlock_t ip6_ra_lock;
197
198/*
199 This structure is prepared by protocol, when parsing
200 ancillary data and passed to IPv6.
201 */
202
fd2c3ef7 203struct ipv6_txoptions {
1da177e4
LT		 204 /* Length of this structure */
205 int tot_len;
206
207 /* length of extension headers */
208
209 __u16 opt_flen; /* after fragment hdr */
210 __u16 opt_nflen; /* before fragment hdr */
211
212 struct ipv6_opt_hdr *hopopt;
213 struct ipv6_opt_hdr *dst0opt;
214 struct ipv6_rt_hdr *srcrt; /* Routing Header */
1da177e4
LT		 215 struct ipv6_opt_hdr *dst1opt;
216
217 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
218};
219
fd2c3ef7 220struct ip6_flowlabel {
7f0e44ac 221 struct ip6_flowlabel __rcu *next;
90bcaf7b 222 __be32 label;
db3459d1 223 atomic_t users;
1da177e4
LT		 224 struct in6_addr dst;
225 struct ipv6_txoptions *opt;
1da177e4 226 unsigned long linger;
d3aedd5e 227 struct rcu_head rcu;
1da177e4 228 u8 share;
4f82f457
EB		 229 union {
230 struct pid *pid;
231 kuid_t uid;
232 } owner;
1da177e4
LT		 233 unsigned long lastuse;
234 unsigned long expires;
60e8fbc4 235 struct net *fl_net;
1da177e4
LT		 236};
237
f3a7c66b
HH		 238#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
239#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
1da177e4 240
fd2c3ef7 241struct ipv6_fl_socklist {
7f0e44ac
ED		 242 struct ipv6_fl_socklist __rcu *next;
243 struct ip6_flowlabel *fl;
244 struct rcu_head rcu;
1da177e4
LT		 245};
246
90bcaf7b 247extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
1da177e4
LT		 248extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
249 struct ip6_flowlabel * fl,
250 struct ipv6_txoptions * fopt);
251extern void fl6_free_socklist(struct sock *sk);
252extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
0a3e78ac 253extern int ip6_flowlabel_init(void);
1da177e4
LT		 254extern void ip6_flowlabel_cleanup(void);
255
256static inline void fl6_sock_release(struct ip6_flowlabel *fl)
257{
258 if (fl)
259 atomic_dec(&fl->users);
260}
261
b94f1c09
DM		 262extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
263
6d0bfe22
LC		 264int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
265 struct icmp6hdr *thdr, int len);
266
267struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
268 struct sock *sk, struct flowi6 *fl6);
269
725a8ff0 270extern int ip6_ra_control(struct sock *sk, int sel);
1da177e4 271
e5bbef20 272extern int ipv6_parse_hopopts(struct sk_buff *skb);
1da177e4
LT		 273
274extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
333fad53
YH		 275extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
276 int newtype,
277 struct ipv6_opt_hdr __user *newopt,
278 int newoptlen);
df9890c3
YH		 279struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
280 struct ipv6_txoptions *opt);
1da177e4 281
92113bfd 282extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
399c07de 283
aeaf6e9d
SL		 284static inline bool ipv6_accept_ra(struct inet6_dev *idev)
285{
286 /* If forwarding is enabled, RA are not accepted unless the special
287 * hybrid mode (accept_ra=2) is enabled.
288 */
289 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
290 idev->cnf.accept_ra;
291}
292
d4915c08
AW		 293#if IS_ENABLED(CONFIG_IPV6)
294static inline int ip6_frag_nqueues(struct net *net)
295{
296 return net->ipv6.frags.nqueues;
297}
298
299static inline int ip6_frag_mem(struct net *net)
300{
d433673e 301 return sum_frag_mem_limit(&net->ipv6.frags);
d4915c08
AW		 302}
303#endif
1da177e4 304
c2a93660
JDB		 305#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
306#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
9874c41c 307#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
1da177e4 308
b1cacb68
YH		 309extern int __ipv6_addr_type(const struct in6_addr *addr);
310static inline int ipv6_addr_type(const struct in6_addr *addr)
311{
312 return __ipv6_addr_type(addr) & 0xffff;
313}
1da177e4
LT		 314
315static inline int ipv6_addr_scope(const struct in6_addr *addr)
316{
b1cacb68
YH		 317 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
318}
319
320static inline int __ipv6_addr_src_scope(int type)
321{
a02cec21 322 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
b1cacb68
YH		 323}
324
325static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
326{
327 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 328}
329
b7ef213e
HFS		 330static inline bool __ipv6_addr_needs_scope_id(int type)
331{
332 return type & IPV6_ADDR_LINKLOCAL ||
333 (type & IPV6_ADDR_MULTICAST &&
334 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
335}
336
337static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
338{
339 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
340}
341
1da177e4
LT		 342static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
343{
db3459d1 344 return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 345}
346
1a203cb3 347static inline bool
f2ffd9ee
PM		 348ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
349 const struct in6_addr *a2)
350{
1a203cb3
ED		 351#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
352 const unsigned long *ul1 = (const unsigned long *)a1;
353 const unsigned long *ulm = (const unsigned long *)m;
354 const unsigned long *ul2 = (const unsigned long *)a2;
355
356 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
357 ((ul1[1] ^ ul2[1]) & ulm[1]));
358#else
a02cec21
ED		 359 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
360 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
361 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
362 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
1a203cb3 363#endif
f2ffd9ee
PM		 364}
365
1da177e4
LT		 366static inline void ipv6_addr_prefix(struct in6_addr *pfx,
367 const struct in6_addr *addr,
368 int plen)
369{
370 /* caller must guarantee 0 <= plen <= 128 */
371 int o = plen >> 3,
372 b = plen & 0x7;
373
db3459d1 374 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4 375 memcpy(pfx->s6_addr, addr, o);
db3459d1 376 if (b != 0)
1da177e4 377 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4
LT		 378}
379
5206c579
YH		 380static inline void __ipv6_addr_set_half(__be32 *addr,
381 __be32 wh, __be32 wl)
382{
383#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
384#if defined(__BIG_ENDIAN)
385 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
386 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
387 return;
388 }
389#elif defined(__LITTLE_ENDIAN)
390 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
391 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
392 return;
393 }
394#endif
395#endif
396 addr[0] = wh;
397 addr[1] = wl;
398}
399
1da177e4 400static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 401 __be32 w1, __be32 w2,
402 __be32 w3, __be32 w4)
1da177e4 403{
5206c579
YH		 404 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
405 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
1da177e4 406}
1da177e4 407
92113bfd
ED		 408static inline bool ipv6_addr_equal(const struct in6_addr *a1,
409 const struct in6_addr *a2)
1da177e4 410{
1a203cb3
ED		 411#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
412 const unsigned long *ul1 = (const unsigned long *)a1;
413 const unsigned long *ul2 = (const unsigned long *)a2;
414
415 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
416#else
a02cec21
ED		 417 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
418 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
419 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
420 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
1a203cb3 421#endif
1da177e4
LT		 422}
423
38675170
YH		 424#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
425static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
426 const __be64 *a2,
427 unsigned int len)
428{
512613d7 429 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
38675170
YH		 430 return false;
431 return true;
432}
433
434static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
435 const struct in6_addr *addr2,
436 unsigned int prefixlen)
437{
438 const __be64 *a1 = (const __be64 *)addr1;
439 const __be64 *a2 = (const __be64 *)addr2;
440
441 if (prefixlen >= 64) {
442 if (a1[0] ^ a2[0])
443 return false;
444 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
445 }
446 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
447}
448#else
2ef97332
YH		 449static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
450 const struct in6_addr *addr2,
451 unsigned int prefixlen)
1da177e4 452{
2ef97332
YH		 453 const __be32 *a1 = addr1->s6_addr32;
454 const __be32 *a2 = addr2->s6_addr32;
95c96174 455 unsigned int pdw, pbi;
1da177e4
LT		 456
457 /* check complete u32 in prefix */
458 pdw = prefixlen >> 5;
459 if (pdw && memcmp(a1, a2, pdw << 2))
92113bfd 460 return false;
1da177e4
LT		 461
462 /* check incomplete u32 in prefix */
463 pbi = prefixlen & 0x1f;
464 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
92113bfd 465 return false;
1da177e4 466
92113bfd 467 return true;
1da177e4 468}
38675170 469#endif
1da177e4 470
2588fe1d 471struct inet_frag_queue;
2588fe1d 472
0b5ccb2e
PM		 473enum ip6_defrag_users {
474 IP6_DEFRAG_LOCAL_DELIVER,
475 IP6_DEFRAG_CONNTRACK_IN,
4be929be 476 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
0b5ccb2e 477 IP6_DEFRAG_CONNTRACK_OUT,
4be929be 478 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68 479 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be 480 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
0b5ccb2e
PM		 481};
482
c6fda282
PE		 483struct ip6_create_arg {
484 __be32 id;
0b5ccb2e 485 u32 user;
b71d1d42
ED		 486 const struct in6_addr *src;
487 const struct in6_addr *dst;
eec2e618 488 u8 ecn;
c6fda282
PE		 489};
490
491void ip6_frag_init(struct inet_frag_queue *q, void *a);
cbc264ca 492bool ip6_frag_match(struct inet_frag_queue *q, void *a);
c6fda282 493
b836c99f
AW		 494/*
495 * Equivalent of ipv4 struct ip
496 */
497struct frag_queue {
498 struct inet_frag_queue q;
499
500 __be32 id; /* fragment id */
501 u32 user;
502 struct in6_addr saddr;
503 struct in6_addr daddr;
504
505 int iif;
506 unsigned int csum;
507 __u16 nhoffset;
eec2e618 508 u8 ecn;
b836c99f
AW		 509};
510
511void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
512 struct inet_frags *frags);
513
92113bfd 514static inline bool ipv6_addr_any(const struct in6_addr *a)
1da177e4 515{
1a203cb3
ED		 516#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
517 const unsigned long *ul = (const unsigned long *)a;
518
519 return (ul[0] | ul[1]) == 0UL;
520#else
a02cec21
ED		 521 return (a->s6_addr32[0] | a->s6_addr32[1] |
522 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
1a203cb3 523#endif
1da177e4
LT		 524}
525
ddbe5032
ED		 526static inline u32 ipv6_addr_hash(const struct in6_addr *a)
527{
528#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
529 const unsigned long *ul = (const unsigned long *)a;
530 unsigned long x = ul[0] ^ ul[1];
531
532 return (u32)(x ^ (x >> 32));
533#else
534 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
535 a->s6_addr32[2] ^ a->s6_addr32[3]);
536#endif
537}
538
08dcdbf6
ED		 539/* more secured version of ipv6_addr_hash() */
540static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
541{
542 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
543
544 return jhash_3words(v,
545 (__force u32)a->s6_addr32[2],
546 (__force u32)a->s6_addr32[3],
547 ipv6_hash_secret);
548}
549
92113bfd 550static inline bool ipv6_addr_loopback(const struct in6_addr *a)
f630e43a 551{
e287656b
YH		 552#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
553 const unsigned long *ul = (const unsigned long *)a;
554
555 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
556#else
a02cec21
ED		 557 return (a->s6_addr32[0] | a->s6_addr32[1] |
558 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
e287656b 559#endif
f630e43a
YH		 560}
561
92113bfd 562static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
e773e4fa 563{
a04d40b8
YH		 564 return (
565#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
566 *(__be64 *)a |
567#else
568 (a->s6_addr32[0] | a->s6_addr32[1]) |
569#endif
570 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
e773e4fa
BH		 571}
572
99cd07a5
JMT		 573/*
574 * Check for a RFC 4843 ORCHID address
575 * (Overlay Routable Cryptographic Hash Identifiers)
576 */
92113bfd 577static inline bool ipv6_addr_orchid(const struct in6_addr *a)
99cd07a5 578{
a02cec21 579 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
99cd07a5
JMT		 580}
581
f15364bd
AC		 582static inline void ipv6_addr_set_v4mapped(const __be32 addr,
583 struct in6_addr *v4mapped)
584{
585 ipv6_addr_set(v4mapped,
586 0, 0,
587 htonl(0x0000FFFF),
588 addr);
589}
590
971f359d
YH		 591/*
592 * find the first different bit between two addresses
593 * length of address must be a multiple of 32bits
594 */
9f2e7334 595static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
971f359d 596{
ef296f56 597 const __be32 *a1 = token1, *a2 = token2;
971f359d
YH		 598 int i;
599
600 addrlen >>= 2;
601
602 for (i = 0; i < addrlen; i++) {
ef296f56
AV		 603 __be32 xb = a1[i] ^ a2[i];
604 if (xb)
d57b8fb8 605 return i * 32 + 31 - __fls(ntohl(xb));
971f359d
YH		 606 }
607
608 /*
609 * we should *never* get to this point since that
610 * would mean the addrs are equal
611 *
612 * However, we do get to it 8) And exacly, when
613 * addresses are equal 8)
614 *
615 * ip route add 1111::/128 via ...
616 * ip route add 1111::/64 via ...
617 * and we are here.
618 *
619 * Ideally, this function should stop comparison
620 * at prefix length. It does not, but it is still OK,
621 * if returned value is greater than prefix length.
622 * --ANK (980803)
623 */
a02cec21 624 return addrlen << 5;
971f359d
YH		 625}
626
9f2e7334
YH		 627#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
628static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
629{
630 const __be64 *a1 = token1, *a2 = token2;
631 int i;
632
633 addrlen >>= 3;
634
635 for (i = 0; i < addrlen; i++) {
636 __be64 xb = a1[i] ^ a2[i];
637 if (xb)
638 return i * 64 + 63 - __fls(be64_to_cpu(xb));
639 }
640
641 return addrlen << 6;
642}
643#endif
644
645static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
646{
647#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
648 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
649 return __ipv6_addr_diff64(token1, token2, addrlen);
650#endif
651 return __ipv6_addr_diff32(token1, token2, addrlen);
652}
653
971f359d
YH		 654static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
655{
656 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
657}
658
87c48fa3 659extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
7ea2f2c5 660
3e4e4c1f
YH		 661/*
662 * Header manipulation
663 */
664static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
665 __be32 flowlabel)
666{
07f623d3 667 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
3e4e4c1f
YH		 668}
669
6502ca52
YH		 670static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
671{
672 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
673}
674
1da177e4
LT		 675/*
676 * Prototypes exported by ipv6
677 */
678
679/*
680 * rcv function (called from netdevice level)
681 */
682
683extern int ipv6_rcv(struct sk_buff *skb,
684 struct net_device *dev,
f2ccd8fa
DM		 685 struct packet_type *pt,
686 struct net_device *orig_dev);
1da177e4 687
b05e1066
PM		 688extern int ip6_rcv_finish(struct sk_buff *skb);
689
1da177e4
LT		 690/*
691 * upper-layer output functions
692 */
693extern int ip6_xmit(struct sock *sk,
694 struct sk_buff *skb,
4c9483b2 695 struct flowi6 *fl6,
b903d324
ED		 696 struct ipv6_txoptions *opt,
697 int tclass);
1da177e4 698
1da177e4
LT		 699extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
700
701extern int ip6_append_data(struct sock *sk,
702 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
703 void *from,
704 int length,
705 int transhdrlen,
706 int hlimit,
41a1f8ea 707 int tclass,
1da177e4 708 struct ipv6_txoptions *opt,
4c9483b2 709 struct flowi6 *fl6,
1da177e4 710 struct rt6_info *rt,
13b52cd4
BH		 711 unsigned int flags,
712 int dontfrag);
1da177e4
LT		 713
714extern int ip6_push_pending_frames(struct sock *sk);
715
716extern void ip6_flush_pending_frames(struct sock *sk);
717
718extern int ip6_dst_lookup(struct sock *sk,
719 struct dst_entry **dst,
4c9483b2 720 struct flowi6 *fl6);
68d0c6d3 721extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
4c9483b2 722 struct flowi6 *fl6,
68d0c6d3 723 const struct in6_addr *final_dst,
a1414715 724 bool can_sleep);
68d0c6d3 725extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
4c9483b2 726 struct flowi6 *fl6,
68d0c6d3 727 const struct in6_addr *final_dst,
a1414715 728 bool can_sleep);
2774c131
DM		 729extern struct dst_entry * ip6_blackhole_route(struct net *net,
730 struct dst_entry *orig_dst);
1da177e4
LT		 731
732/*
733 * skb processing functions
734 */
735
736extern int ip6_output(struct sk_buff *skb);
737extern int ip6_forward(struct sk_buff *skb);
738extern int ip6_input(struct sk_buff *skb);
739extern int ip6_mc_input(struct sk_buff *skb);
740
ef76bc23
HX		 741extern int __ip6_local_out(struct sk_buff *skb);
742extern int ip6_local_out(struct sk_buff *skb);
743
1da177e4
LT		 744/*
745 * Extension header (options) processing
746 */
747
1da177e4
LT		 748extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
749 struct ipv6_txoptions *opt,
750 u8 *proto,
751 struct in6_addr **daddr_p);
752extern void ipv6_push_frag_opts(struct sk_buff *skb,
753 struct ipv6_txoptions *opt,
754 u8 *proto);
755
756extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
75f2811c 757 u8 *nexthdrp, __be16 *frag_offp);
1da177e4 758
a50feda5 759extern bool ipv6_ext_hdr(u8 nexthdr);
1da177e4 760
f8f62675 761enum {
9195bb8e
AA		 762 IP6_FH_F_FRAG = (1 << 0),
763 IP6_FH_F_AUTH = (1 << 1),
764 IP6_FH_F_SKIP_RH = (1 << 2),
f8f62675
JG		 765};
766
767/* find specified header and get offset to it */
768extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
769 int target, unsigned short *fragoff, int *fragflg);
770
c61a4043
MN		 771extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
772
4c9483b2 773extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
20c59de2
AE		 774 const struct ipv6_txoptions *opt,
775 struct in6_addr *orig);
776
1da177e4
LT		 777/*
778 * socket options (ipv6_sockglue.c)
779 */
780
781extern int ipv6_setsockopt(struct sock *sk, int level,
782 int optname,
783 char __user *optval,
b7058842 784 unsigned int optlen);
1da177e4
LT		 785extern int ipv6_getsockopt(struct sock *sk, int level,
786 int optname,
787 char __user *optval,
788 int __user *optlen);
3fdadf7d
DM		 789extern int compat_ipv6_setsockopt(struct sock *sk,
790 int level,
791 int optname,
792 char __user *optval,
b7058842 793 unsigned int optlen);
3fdadf7d
DM		 794extern int compat_ipv6_getsockopt(struct sock *sk,
795 int level,
796 int optname,
797 char __user *optval,
798 int __user *optlen);
1da177e4 799
1da177e4
LT		 800extern int ip6_datagram_connect(struct sock *sk,
801 struct sockaddr *addr, int addr_len);
802
803extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
4b340ae2 804extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
e69a4adc 805extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1da177e4 806 u32 info, u8 *payload);
4c9483b2
DM		 807extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
808extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1da177e4
LT		 809
810extern int inet6_release(struct socket *sock);
811extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
812 int addr_len);
813extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
814 int *uaddr_len, int peer);
815extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
816 unsigned long arg);
817
d8313f5c
ACM		 818extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
819 struct sock *sk);
820
1da177e4
LT		 821/*
822 * reassembly.c
823 */
90ddc4f0
ED		 824extern const struct proto_ops inet6_stream_ops;
825extern const struct proto_ops inet6_dgram_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
9e8cda3b
JP		 863extern struct ctl_table ipv6_route_table_template[];
864extern struct 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 */
Linux kernel - Deliverables
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