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leds: gpio: Support the "panic-indicator" firmware property
[linux-2.6-block.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>
1bd758eb 22#include <net/flow_dissector.h>
1da177e4
LT		 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. */
c12b395a 39#define NEXTHDR_GRE 47 /* GRE header. */
1da177e4
LT		 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. */
280c571e 45#define NEXTHDR_SCTP 132 /* SCTP message. */
2b741653 46#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4
LT		 47
48#define NEXTHDR_MAX 255
49
1da177e4
LT		 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
1431fb31
PD		 112#define IP6_MF 0x0001
113#define IP6_OFFSET 0xFFF8
1da177e4 114
e110861f
LC		 115#define IP6_REPLY_MARK(net, mark) \
116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117
1da177e4
LT		 118#include <net/sock.h>
119
120/* sysctls */
1da177e4 121extern int sysctl_mld_max_msf;
2f711939 122extern int sysctl_mld_qrv;
3d7cc2ba 123
087fe240 124#define _DEVINC(net, statname, modifier, idev, field) \
14878f75 125({ \
a11d206d
YH		 126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
14878f75 128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
9261e537 129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
a11d206d 130})
14878f75 131
be281e55
ED		 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
2a24444f
ED		 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
087fe240 150#define _DEVADD(net, statname, modifier, idev, field, val) \
8e7999c4
PE		 151({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
9261e537 155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
8e7999c4
PE		 156})
157
edf391ff
NH		 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
14878f75 166/* MIBs */
14878f75 167
087fe240 168#define IP6_INC_STATS(net, idev,field) \
4ce3c183 169 _DEVINC(net, ipv6, 64, idev, field)
087fe240 170#define IP6_INC_STATS_BH(net, idev,field) \
4ce3c183 171 _DEVINC(net, ipv6, 64_BH, idev, field)
edf391ff 172#define IP6_ADD_STATS(net, idev,field,val) \
4ce3c183 173 _DEVADD(net, ipv6, 64, idev, field, val)
087fe240 174#define IP6_ADD_STATS_BH(net, idev,field,val) \
4ce3c183 175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
edf391ff 176#define IP6_UPD_PO_STATS(net, idev,field,val) \
4ce3c183 177 _DEVUPD(net, ipv6, 64, idev, field, val)
edf391ff 178#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
4ce3c183 179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
087fe240 180#define ICMP6_INC_STATS(net, idev, field) \
be281e55 181 _DEVINCATOMIC(net, icmpv6, , idev, field)
087fe240 182#define ICMP6_INC_STATS_BH(net, idev, field) \
be281e55 183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
087fe240
DL		 184
185#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
2a24444f 186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
087fe240 187#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
2a24444f 188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
087fe240 189#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
2a24444f 190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
14878f75 191
fd2c3ef7 192struct ip6_ra_chain {
1da177e4
LT		 193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197};
198
199extern struct ip6_ra_chain *ip6_ra_chain;
200extern 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
fd2c3ef7 207struct ipv6_txoptions {
45f6fad8 208 atomic_t refcnt;
1da177e4
LT		 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 */
1da177e4 220 struct ipv6_opt_hdr *dst1opt;
45f6fad8 221 struct rcu_head rcu;
1da177e4
LT		 222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223};
224
fd2c3ef7 225struct ip6_flowlabel {
7f0e44ac 226 struct ip6_flowlabel __rcu *next;
90bcaf7b 227 __be32 label;
db3459d1 228 atomic_t users;
1da177e4
LT		 229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
1da177e4 231 unsigned long linger;
d3aedd5e 232 struct rcu_head rcu;
1da177e4 233 u8 share;
4f82f457
EB		 234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
1da177e4
LT		 238 unsigned long lastuse;
239 unsigned long expires;
60e8fbc4 240 struct net *fl_net;
1da177e4
LT		 241};
242
82a584b7
TH		 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
37cfee90 247#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
d76ed22b 248#define IPV6_TCLASS_SHIFT 20
1da177e4 249
fd2c3ef7 250struct ipv6_fl_socklist {
7f0e44ac
ED		 251 struct ipv6_fl_socklist __rcu *next;
252 struct ip6_flowlabel *fl;
253 struct rcu_head rcu;
1da177e4
LT		 254};
255
45f6fad8
ED		 256static 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);
e550785c
BP		 262 if (opt) {
263 if (!atomic_inc_not_zero(&opt->refcnt))
264 opt = NULL;
265 else
266 opt = rcu_pointer_handoff(opt);
267 }
45f6fad8
ED		 268 rcu_read_unlock();
269 return opt;
270}
271
272static 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
5c3a0fd7
JP		 278struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
279struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
280 struct ip6_flowlabel *fl,
281 struct ipv6_txoptions *fopt);
282void fl6_free_socklist(struct sock *sk);
283int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
46e5f401
FF		 284int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
285 int flags);
5c3a0fd7
JP		 286int ip6_flowlabel_init(void);
287void ip6_flowlabel_cleanup(void);
1da177e4
LT		 288
289static inline void fl6_sock_release(struct ip6_flowlabel *fl)
290{
291 if (fl)
292 atomic_dec(&fl->users);
293}
294
5c3a0fd7 295void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
b94f1c09 296
6d0bfe22
LC		 297int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
298 struct icmp6hdr *thdr, int len);
299
5c3a0fd7 300int ip6_ra_control(struct sock *sk, int sel);
1da177e4 301
5c3a0fd7 302int ipv6_parse_hopopts(struct sk_buff *skb);
1da177e4 303
5c3a0fd7
JP		 304struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
305 struct ipv6_txoptions *opt);
306struct 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);
df9890c3
YH		 311struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
312 struct ipv6_txoptions *opt);
1da177e4 313
a224772d
ED		 314bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
315 const struct inet6_skb_parm *opt);
399c07de 316
aeaf6e9d
SL		 317static inline bool ipv6_accept_ra(struct inet6_dev *idev)
318{
319 /* If forwarding is enabled, RA are not accepted unless the special
320 * hybrid mode (accept_ra=2) is enabled.
321 */
322 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
323 idev->cnf.accept_ra;
324}
325
d4915c08 326#if IS_ENABLED(CONFIG_IPV6)
d4915c08
AW		 327static inline int ip6_frag_mem(struct net *net)
328{
d433673e 329 return sum_frag_mem_limit(&net->ipv6.frags);
d4915c08
AW		 330}
331#endif
1da177e4 332
c2a93660
JDB		 333#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
334#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
9874c41c 335#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
1da177e4 336
5c3a0fd7 337int __ipv6_addr_type(const struct in6_addr *addr);
b1cacb68
YH		 338static inline int ipv6_addr_type(const struct in6_addr *addr)
339{
340 return __ipv6_addr_type(addr) & 0xffff;
341}
1da177e4
LT		 342
343static inline int ipv6_addr_scope(const struct in6_addr *addr)
344{
b1cacb68
YH		 345 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
346}
347
348static inline int __ipv6_addr_src_scope(int type)
349{
a02cec21 350 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
b1cacb68
YH		 351}
352
353static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
354{
355 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 356}
357
b7ef213e
HFS		 358static inline bool __ipv6_addr_needs_scope_id(int type)
359{
360 return type & IPV6_ADDR_LINKLOCAL ||
361 (type & IPV6_ADDR_MULTICAST &&
362 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
363}
364
365static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
366{
367 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
368}
369
1da177e4
LT		 370static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
371{
db3459d1 372 return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 373}
374
1a203cb3 375static inline bool
f2ffd9ee
PM		 376ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
377 const struct in6_addr *a2)
378{
1a203cb3
ED		 379#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
380 const unsigned long *ul1 = (const unsigned long *)a1;
381 const unsigned long *ulm = (const unsigned long *)m;
382 const unsigned long *ul2 = (const unsigned long *)a2;
383
384 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
385 ((ul1[1] ^ ul2[1]) & ulm[1]));
386#else
a02cec21
ED		 387 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
388 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
389 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
390 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
1a203cb3 391#endif
f2ffd9ee
PM		 392}
393
1da177e4
LT		 394static inline void ipv6_addr_prefix(struct in6_addr *pfx,
395 const struct in6_addr *addr,
396 int plen)
397{
398 /* caller must guarantee 0 <= plen <= 128 */
399 int o = plen >> 3,
400 b = plen & 0x7;
401
db3459d1 402 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4 403 memcpy(pfx->s6_addr, addr, o);
db3459d1 404 if (b != 0)
1da177e4 405 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4
LT		 406}
407
818f1f3e
AA		 408static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
409 const struct in6_addr *pfx,
410 int plen)
411{
412 /* caller must guarantee 0 <= plen <= 128 */
413 int o = plen >> 3,
414 b = plen & 0x7;
415
416 memcpy(addr->s6_addr, pfx, o);
417 if (b != 0) {
418 addr->s6_addr[o] &= ~(0xff00 >> b);
419 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
420 }
421}
422
5206c579
YH		 423static inline void __ipv6_addr_set_half(__be32 *addr,
424 __be32 wh, __be32 wl)
425{
426#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427#if defined(__BIG_ENDIAN)
428 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
429 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
430 return;
431 }
432#elif defined(__LITTLE_ENDIAN)
433 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
434 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
435 return;
436 }
437#endif
438#endif
439 addr[0] = wh;
440 addr[1] = wl;
441}
442
1da177e4 443static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 444 __be32 w1, __be32 w2,
445 __be32 w3, __be32 w4)
1da177e4 446{
5206c579
YH		 447 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
448 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
1da177e4 449}
1da177e4 450
92113bfd
ED		 451static inline bool ipv6_addr_equal(const struct in6_addr *a1,
452 const struct in6_addr *a2)
1da177e4 453{
1a203cb3
ED		 454#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
455 const unsigned long *ul1 = (const unsigned long *)a1;
456 const unsigned long *ul2 = (const unsigned long *)a2;
457
458 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
459#else
a02cec21
ED		 460 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
461 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
462 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
463 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
1a203cb3 464#endif
1da177e4
LT		 465}
466
38675170
YH		 467#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
469 const __be64 *a2,
470 unsigned int len)
471{
512613d7 472 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
38675170
YH		 473 return false;
474 return true;
475}
476
477static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
478 const struct in6_addr *addr2,
479 unsigned int prefixlen)
480{
481 const __be64 *a1 = (const __be64 *)addr1;
482 const __be64 *a2 = (const __be64 *)addr2;
483
484 if (prefixlen >= 64) {
485 if (a1[0] ^ a2[0])
486 return false;
487 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
488 }
489 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
490}
491#else
2ef97332
YH		 492static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
493 const struct in6_addr *addr2,
494 unsigned int prefixlen)
1da177e4 495{
2ef97332
YH		 496 const __be32 *a1 = addr1->s6_addr32;
497 const __be32 *a2 = addr2->s6_addr32;
95c96174 498 unsigned int pdw, pbi;
1da177e4
LT		 499
500 /* check complete u32 in prefix */
501 pdw = prefixlen >> 5;
502 if (pdw && memcmp(a1, a2, pdw << 2))
92113bfd 503 return false;
1da177e4
LT		 504
505 /* check incomplete u32 in prefix */
506 pbi = prefixlen & 0x1f;
507 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
92113bfd 508 return false;
1da177e4 509
92113bfd 510 return true;
1da177e4 511}
38675170 512#endif
1da177e4 513
2588fe1d 514struct inet_frag_queue;
2588fe1d 515
0b5ccb2e
PM		 516enum ip6_defrag_users {
517 IP6_DEFRAG_LOCAL_DELIVER,
518 IP6_DEFRAG_CONNTRACK_IN,
4be929be 519 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
0b5ccb2e 520 IP6_DEFRAG_CONNTRACK_OUT,
4be929be 521 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68 522 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be 523 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
0b5ccb2e
PM		 524};
525
c6fda282
PE		 526struct ip6_create_arg {
527 __be32 id;
0b5ccb2e 528 u32 user;
b71d1d42
ED		 529 const struct in6_addr *src;
530 const struct in6_addr *dst;
264640fc 531 int iif;
eec2e618 532 u8 ecn;
c6fda282
PE		 533};
534
36c77782
FW		 535void ip6_frag_init(struct inet_frag_queue *q, const void *a);
536bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
c6fda282 537
b836c99f
AW		 538/*
539 * Equivalent of ipv4 struct ip
540 */
541struct frag_queue {
542 struct inet_frag_queue q;
543
544 __be32 id; /* fragment id */
545 u32 user;
546 struct in6_addr saddr;
547 struct in6_addr daddr;
548
549 int iif;
550 unsigned int csum;
551 __u16 nhoffset;
eec2e618 552 u8 ecn;
b836c99f
AW		 553};
554
555void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
556 struct inet_frags *frags);
557
92113bfd 558static inline bool ipv6_addr_any(const struct in6_addr *a)
1da177e4 559{
1a203cb3
ED		 560#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
561 const unsigned long *ul = (const unsigned long *)a;
562
563 return (ul[0] | ul[1]) == 0UL;
564#else
a02cec21
ED		 565 return (a->s6_addr32[0] | a->s6_addr32[1] |
566 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
1a203cb3 567#endif
1da177e4
LT		 568}
569
ddbe5032
ED		 570static inline u32 ipv6_addr_hash(const struct in6_addr *a)
571{
572#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573 const unsigned long *ul = (const unsigned long *)a;
574 unsigned long x = ul[0] ^ ul[1];
575
576 return (u32)(x ^ (x >> 32));
577#else
578 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
579 a->s6_addr32[2] ^ a->s6_addr32[3]);
580#endif
581}
582
08dcdbf6 583/* more secured version of ipv6_addr_hash() */
b50026b5 584static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
08dcdbf6
ED		 585{
586 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
587
588 return jhash_3words(v,
589 (__force u32)a->s6_addr32[2],
590 (__force u32)a->s6_addr32[3],
b50026b5 591 initval);
08dcdbf6
ED		 592}
593
92113bfd 594static inline bool ipv6_addr_loopback(const struct in6_addr *a)
f630e43a 595{
e287656b 596#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
1373a773 597 const __be64 *be = (const __be64 *)a;
e287656b 598
1373a773 599 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
e287656b 600#else
a02cec21 601 return (a->s6_addr32[0] | a->s6_addr32[1] |
1373a773 602 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
e287656b 603#endif
f630e43a
YH		 604}
605
1373a773
JL		 606/*
607 * Note that we must __force cast these to unsigned long to make sparse happy,
608 * since all of the endian-annotated types are fixed size regardless of arch.
609 */
92113bfd 610static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
e773e4fa 611{
a04d40b8
YH		 612 return (
613#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
1373a773 614 *(unsigned long *)a |
a04d40b8 615#else
1373a773 616 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
a04d40b8 617#endif
1373a773
JL		 618 (__force unsigned long)(a->s6_addr32[2] ^
619 cpu_to_be32(0x0000ffff))) == 0UL;
e773e4fa
BH		 620}
621
99cd07a5
JMT		 622/*
623 * Check for a RFC 4843 ORCHID address
624 * (Overlay Routable Cryptographic Hash Identifiers)
625 */
92113bfd 626static inline bool ipv6_addr_orchid(const struct in6_addr *a)
99cd07a5 627{
a02cec21 628 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
99cd07a5
JMT		 629}
630
5c98631c
LC		 631static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
632{
633 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
634}
635
f15364bd
AC		 636static inline void ipv6_addr_set_v4mapped(const __be32 addr,
637 struct in6_addr *v4mapped)
638{
639 ipv6_addr_set(v4mapped,
640 0, 0,
641 htonl(0x0000FFFF),
642 addr);
643}
644
971f359d
YH		 645/*
646 * find the first different bit between two addresses
647 * length of address must be a multiple of 32bits
648 */
9f2e7334 649static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
971f359d 650{
ef296f56 651 const __be32 *a1 = token1, *a2 = token2;
971f359d
YH		 652 int i;
653
654 addrlen >>= 2;
655
656 for (i = 0; i < addrlen; i++) {
ef296f56
AV		 657 __be32 xb = a1[i] ^ a2[i];
658 if (xb)
d57b8fb8 659 return i * 32 + 31 - __fls(ntohl(xb));
971f359d
YH		 660 }
661
662 /*
663 * we should *never* get to this point since that
664 * would mean the addrs are equal
665 *
666 * However, we do get to it 8) And exacly, when
667 * addresses are equal 8)
668 *
669 * ip route add 1111::/128 via ...
670 * ip route add 1111::/64 via ...
671 * and we are here.
672 *
673 * Ideally, this function should stop comparison
674 * at prefix length. It does not, but it is still OK,
675 * if returned value is greater than prefix length.
676 * --ANK (980803)
677 */
a02cec21 678 return addrlen << 5;
971f359d
YH		 679}
680
9f2e7334
YH		 681#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
682static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
683{
684 const __be64 *a1 = token1, *a2 = token2;
685 int i;
686
687 addrlen >>= 3;
688
689 for (i = 0; i < addrlen; i++) {
690 __be64 xb = a1[i] ^ a2[i];
691 if (xb)
692 return i * 64 + 63 - __fls(be64_to_cpu(xb));
693 }
694
695 return addrlen << 6;
696}
697#endif
698
699static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
700{
701#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
702 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
703 return __ipv6_addr_diff64(token1, token2, addrlen);
704#endif
705 return __ipv6_addr_diff32(token1, token2, addrlen);
706}
707
971f359d
YH		 708static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
709{
710 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
711}
712
7f159867
ED		 713__be32 ipv6_select_ident(struct net *net,
714 const struct in6_addr *daddr,
715 const struct in6_addr *saddr);
5a352dd0 716void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
5188cd44 717
5c3a0fd7 718int ip6_dst_hoplimit(struct dst_entry *dst);
3ce9b35f 719
5c98631c
LC		 720static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
721 struct dst_entry *dst)
722{
723 int hlimit;
724
725 if (ipv6_addr_is_multicast(&fl6->daddr))
726 hlimit = np->mcast_hops;
727 else
728 hlimit = np->hop_limit;
729 if (hlimit < 0)
730 hlimit = ip6_dst_hoplimit(dst);
731 return hlimit;
732}
733
c3f83241
TH		 734/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
735 * Equivalent to : flow->v6addrs.src = iph->saddr;
736 * flow->v6addrs.dst = iph->daddr;
737 */
738static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
739 const struct ipv6hdr *iph)
740{
741 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
742 offsetof(typeof(flow->addrs), v6addrs.src) +
743 sizeof(flow->addrs.v6addrs.src));
744 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
745 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
746}
747
a37934fc 748#if IS_ENABLED(CONFIG_IPV6)
42240901
TH		 749
750/* Sysctl settings for net ipv6.auto_flowlabels */
751#define IP6_AUTO_FLOW_LABEL_OFF 0
752#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
753#define IP6_AUTO_FLOW_LABEL_OPTIN 2
754#define IP6_AUTO_FLOW_LABEL_FORCED 3
755
756#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
757
b5677416 758#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
42240901 759
cb1ce2ef 760static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
67800f9b
TH		 761 __be32 flowlabel, bool autolabel,
762 struct flowi6 *fl6)
cb1ce2ef 763{
42240901 764 u32 hash;
cb1ce2ef 765
42240901
TH		 766 if (flowlabel ||
767 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
768 (!autolabel &&
769 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
770 return flowlabel;
cb1ce2ef 771
42240901 772 hash = skb_get_hash_flowi6(skb, fl6);
cb1ce2ef 773
42240901
TH		 774 /* Since this is being sent on the wire obfuscate hash a bit
775 * to minimize possbility that any useful information to an
776 * attacker is leaked. Only lower 20 bits are relevant.
777 */
778 rol32(hash, 16);
82a584b7 779
42240901
TH		 780 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
781
782 if (net->ipv6.sysctl.flowlabel_state_ranges)
783 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
cb1ce2ef
TH		 784
785 return flowlabel;
786}
42240901
TH		 787
788static inline int ip6_default_np_autolabel(struct net *net)
789{
790 switch (net->ipv6.sysctl.auto_flowlabels) {
791 case IP6_AUTO_FLOW_LABEL_OFF:
792 case IP6_AUTO_FLOW_LABEL_OPTIN:
793 default:
794 return 0;
795 case IP6_AUTO_FLOW_LABEL_OPTOUT:
796 case IP6_AUTO_FLOW_LABEL_FORCED:
797 return 1;
798 }
799}
a37934fc
FF		 800#else
801static inline void ip6_set_txhash(struct sock *sk) { }
802static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
42240901
TH		 803 __be32 flowlabel, bool autolabel,
804 struct flowi6 *fl6)
a37934fc
FF		 805{
806 return flowlabel;
807}
42240901
TH		 808static inline int ip6_default_np_autolabel(struct net *net)
809{
810 return 0;
811}
a37934fc
FF		 812#endif
813
cb1ce2ef 814
3e4e4c1f
YH		 815/*
816 * Header manipulation
817 */
818static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
819 __be32 flowlabel)
820{
07f623d3 821 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
3e4e4c1f
YH		 822}
823
6502ca52
YH		 824static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
825{
826 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
827}
828
3308de2b
FF		 829static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
830{
831 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
832}
833
d76ed22b
LR		 834static inline u8 ip6_tclass(__be32 flowinfo)
835{
836 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
837}
eaa93bf4
DB		 838
839static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
840{
841 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
842}
843
1da177e4
LT		 844/*
845 * Prototypes exported by ipv6
846 */
847
848/*
849 * rcv function (called from netdevice level)
850 */
851
5c3a0fd7
JP		 852int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
853 struct packet_type *pt, struct net_device *orig_dev);
1da177e4 854
0c4b51f0 855int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
b05e1066 856
1da177e4
LT		 857/*
858 * upper-layer output functions
859 */
1c1e9d2b 860int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
5c3a0fd7
JP		 861 struct ipv6_txoptions *opt, int tclass);
862
863int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
864
865int ip6_append_data(struct sock *sk,
866 int getfrag(void *from, char *to, int offset, int len,
867 int odd, struct sk_buff *skb),
868 void *from, int length, int transhdrlen, int hlimit,
869 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
870 struct rt6_info *rt, unsigned int flags, int dontfrag);
871
872int ip6_push_pending_frames(struct sock *sk);
873
874void ip6_flush_pending_frames(struct sock *sk);
875
6422398c
VY		 876int ip6_send_skb(struct sk_buff *skb);
877
878struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
879 struct inet_cork_full *cork,
880 struct inet6_cork *v6_cork);
881struct sk_buff *ip6_make_skb(struct sock *sk,
882 int getfrag(void *from, char *to, int offset,
883 int len, int odd, struct sk_buff *skb),
884 void *from, int length, int transhdrlen,
885 int hlimit, int tclass, struct ipv6_txoptions *opt,
886 struct flowi6 *fl6, struct rt6_info *rt,
887 unsigned int flags, int dontfrag);
888
889static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
890{
891 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
892 &inet6_sk(sk)->cork);
893}
894
343d60aa
RP		 895int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
896 struct flowi6 *fl6);
3aef934f 897struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
0e0d44ab 898 const struct in6_addr *final_dst);
5c3a0fd7 899struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
0e0d44ab 900 const struct in6_addr *final_dst);
5c3a0fd7
JP		 901struct dst_entry *ip6_blackhole_route(struct net *net,
902 struct dst_entry *orig_dst);
1da177e4
LT		 903
904/*
905 * skb processing functions
906 */
907
ede2059d 908int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
5c3a0fd7
JP		 909int ip6_forward(struct sk_buff *skb);
910int ip6_input(struct sk_buff *skb);
911int ip6_mc_input(struct sk_buff *skb);
1da177e4 912
cf91a99d 913int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
33224b16 914int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
ef76bc23 915
1da177e4
LT		 916/*
917 * Extension header (options) processing
918 */
919
5c3a0fd7
JP		 920void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
921 u8 *proto, struct in6_addr **daddr_p);
922void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
923 u8 *proto);
1da177e4 924
5c3a0fd7
JP		 925int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
926 __be16 *frag_offp);
1da177e4 927
5c3a0fd7 928bool ipv6_ext_hdr(u8 nexthdr);
1da177e4 929
f8f62675 930enum {
9195bb8e
AA		 931 IP6_FH_F_FRAG = (1 << 0),
932 IP6_FH_F_AUTH = (1 << 1),
933 IP6_FH_F_SKIP_RH = (1 << 2),
f8f62675
JG		 934};
935
936/* find specified header and get offset to it */
5c3a0fd7
JP		 937int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
938 unsigned short *fragoff, int *fragflg);
f8f62675 939
5c3a0fd7 940int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
c61a4043 941
5c3a0fd7
JP		 942struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
943 const struct ipv6_txoptions *opt,
944 struct in6_addr *orig);
20c59de2 945
1da177e4
LT		 946/*
947 * socket options (ipv6_sockglue.c)
948 */
949
5c3a0fd7
JP		 950int ipv6_setsockopt(struct sock *sk, int level, int optname,
951 char __user *optval, unsigned int optlen);
952int ipv6_getsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, int __user *optlen);
954int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
955 char __user *optval, unsigned int optlen);
956int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
957 char __user *optval, int __user *optlen);
958
959int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
82b276cd
HFS		 960int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
961 int addr_len);
5c3a0fd7 962
85fbaa75
HFS		 963int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
964 int *addr_len);
965int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
966 int *addr_len);
5c3a0fd7
JP		 967void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
968 u32 info, u8 *payload);
969void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
970void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
971
972int inet6_release(struct socket *sock);
973int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
974int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
975 int peer);
976int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
977
978int inet6_hash_connect(struct inet_timewait_death_row *death_row,
d8313f5c
ACM		 979 struct sock *sk);
980
1da177e4
LT		 981/*
982 * reassembly.c
983 */
90ddc4f0
ED		 984extern const struct proto_ops inet6_stream_ops;
985extern const struct proto_ops inet6_dgram_ops;
20380731 986
14c85021
ACM		 987struct group_source_req;
988struct group_filter;
989
5c3a0fd7
JP		 990int ip6_mc_source(int add, int omode, struct sock *sk,
991 struct group_source_req *pgsr);
992int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
993int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
994 struct group_filter __user *optval, int __user *optlen);
20380731
ACM		 995
996#ifdef CONFIG_PROC_FS
5c3a0fd7
JP		 997int ac6_proc_init(struct net *net);
998void ac6_proc_exit(struct net *net);
999int raw6_proc_init(void);
1000void raw6_proc_exit(void);
1001int tcp6_proc_init(struct net *net);
1002void tcp6_proc_exit(struct net *net);
1003int udp6_proc_init(struct net *net);
1004void udp6_proc_exit(struct net *net);
1005int udplite6_proc_init(void);
1006void udplite6_proc_exit(void);
1007int ipv6_misc_proc_init(void);
1008void ipv6_misc_proc_exit(void);
1009int snmp6_register_dev(struct inet6_dev *idev);
1010int snmp6_unregister_dev(struct inet6_dev *idev);
20380731 1011
7f7d9a6b 1012#else
6ab57e7e
DL		 1013static inline int ac6_proc_init(struct net *net) { return 0; }
1014static inline void ac6_proc_exit(struct net *net) { }
1015static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1016static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
20380731 1017#endif
1da177e4 1018
20380731 1019#ifdef CONFIG_SYSCTL
9e8cda3b 1020extern struct ctl_table ipv6_route_table_template[];
1da177e4 1021
5c3a0fd7
JP		 1022struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1023struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1024int ipv6_sysctl_register(void);
1025void ipv6_sysctl_unregister(void);
20380731 1026#endif
1da177e4 1027
46a4dee0
MC		 1028int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1029 const struct in6_addr *addr);
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MC		 1030int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1031 const struct in6_addr *addr);
20380731 1032#endif /* _NET_IPV6_H */
Linux 6.x block layer and io_uring tree(s)