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Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / include / net / ipv6.h
CommitLineData
2874c5fd 1/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4
LT		 2/*
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 */
8
9#ifndef _NET_IPV6_H
10#define _NET_IPV6_H
11
12#include <linux/ipv6.h>
13#include <linux/hardirq.h>
08dcdbf6 14#include <linux/jhash.h>
0aeea21a 15#include <linux/refcount.h>
59c820b2 16#include <linux/jump_label_ratelimit.h>
20283d84 17#include <net/if_inet6.h>
1da177e4
LT		 18#include <net/ndisc.h>
19#include <net/flow.h>
1bd758eb 20#include <net/flow_dissector.h>
1da177e4 21#include <net/snmp.h>
f0b1e64c 22#include <net/netns/hash.h>
1da177e4
LT		 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
1da177e4
LT		 49#define IPV6_DEFAULT_HOPLIMIT 64
50#define IPV6_DEFAULT_MCASTHOPS 1
51
47d3d7ac
TH		 52/* Limits on Hop-by-Hop and Destination options.
53 *
54 * Per RFC8200 there is no limit on the maximum number or lengths of options in
55 * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
56 * We allow configurable limits in order to mitigate potential denial of
57 * service attacks.
58 *
59 * There are three limits that may be set:
60 * - Limit the number of options in a Hop-by-Hop or Destination options
61 * extension header
62 * - Limit the byte length of a Hop-by-Hop or Destination options extension
63 * header
64 * - Disallow unknown options
65 *
66 * The limits are expressed in corresponding sysctls:
67 *
68 * ipv6.sysctl.max_dst_opts_cnt
69 * ipv6.sysctl.max_hbh_opts_cnt
70 * ipv6.sysctl.max_dst_opts_len
71 * ipv6.sysctl.max_hbh_opts_len
72 *
73 * max_*_opts_cnt is the number of TLVs that are allowed for Destination
74 * options or Hop-by-Hop options. If the number is less than zero then unknown
75 * TLVs are disallowed and the number of known options that are allowed is the
76 * absolute value. Setting the value to INT_MAX indicates no limit.
77 *
78 * max_*_opts_len is the length limit in bytes of a Destination or
79 * Hop-by-Hop options extension header. Setting the value to INT_MAX
80 * indicates no length limit.
81 *
82 * If a limit is exceeded when processing an extension header the packet is
83 * silently discarded.
84 */
85
86/* Default limits for Hop-by-Hop and Destination options */
87#define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
88#define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
89#define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
90#define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
91
1da177e4
LT		 92/*
93 * Addr type
94 *
95 * type - unicast | multicast
96 * scope - local | site | global
97 * v4 - compat
98 * v4mapped
99 * any
100 * loopback
101 */
102
103#define IPV6_ADDR_ANY 0x0000U
104
82695b30
SH		 105#define IPV6_ADDR_UNICAST 0x0001U
106#define IPV6_ADDR_MULTICAST 0x0002U
1da177e4
LT		 107
108#define IPV6_ADDR_LOOPBACK 0x0010U
109#define IPV6_ADDR_LINKLOCAL 0x0020U
110#define IPV6_ADDR_SITELOCAL 0x0040U
111
112#define IPV6_ADDR_COMPATv4 0x0080U
113
114#define IPV6_ADDR_SCOPE_MASK 0x00f0U
115
116#define IPV6_ADDR_MAPPED 0x1000U
1da177e4
LT		 117
118/*
119 * Addr scopes
120 */
1da177e4
LT		 121#define IPV6_ADDR_MC_SCOPE(a) \
122 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
123#define __IPV6_ADDR_SCOPE_INVALID -1
1da177e4
LT		 124#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
125#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
126#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
127#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
128#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
129
5ced1339
LL		 130/*
131 * Addr flags
132 */
5ced1339
LL		 133#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
134 ((a)->s6_addr[1] & 0x10)
135#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
136 ((a)->s6_addr[1] & 0x20)
137#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
138 ((a)->s6_addr[1] & 0x40)
5ced1339 139
1da177e4
LT		 140/*
141 * fragmentation header
142 */
143
144struct frag_hdr {
44473a6b
AV		 145 __u8 nexthdr;
146 __u8 reserved;
147 __be16 frag_off;
148 __be32 identification;
1da177e4
LT		 149};
150
1431fb31
PD		 151#define IP6_MF 0x0001
152#define IP6_OFFSET 0xFFF8
1da177e4 153
0feca619
PNA		 154struct ip6_fraglist_iter {
155 struct ipv6hdr *tmp_hdr;
0feca619
PNA		 156 struct sk_buff *frag;
157 int offset;
158 unsigned int hlen;
159 __be32 frag_id;
160 u8 nexthdr;
161};
162
163int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
164 u8 nexthdr, __be32 frag_id,
165 struct ip6_fraglist_iter *iter);
166void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
167
168static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
169{
170 struct sk_buff *skb = iter->frag;
171
172 iter->frag = skb->next;
173 skb_mark_not_on_list(skb);
174
175 return skb;
176}
177
8a6a1f17
PNA		 178struct ip6_frag_state {
179 u8 *prevhdr;
180 unsigned int hlen;
181 unsigned int mtu;
182 unsigned int left;
183 int offset;
184 int ptr;
185 int hroom;
186 int troom;
187 __be32 frag_id;
188 u8 nexthdr;
189};
190
191void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
192 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
193 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
194struct sk_buff *ip6_frag_next(struct sk_buff *skb,
195 struct ip6_frag_state *state);
196
e110861f
LC		 197#define IP6_REPLY_MARK(net, mark) \
198 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
199
1da177e4
LT		 200#include <net/sock.h>
201
202/* sysctls */
1da177e4 203extern int sysctl_mld_max_msf;
2f711939 204extern int sysctl_mld_qrv;
3d7cc2ba 205
13415e46 206#define _DEVINC(net, statname, mod, idev, field) \
14878f75 207({ \
a11d206d
YH		 208 struct inet6_dev *_idev = (idev); \
209 if (likely(_idev != NULL)) \
13415e46
ED		 210 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
211 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
a11d206d 212})
14878f75 213
be281e55 214/* per device counters are atomic_long_t */
13415e46 215#define _DEVINCATOMIC(net, statname, mod, idev, field) \
be281e55
ED		 216({ \
217 struct inet6_dev *_idev = (idev); \
218 if (likely(_idev != NULL)) \
219 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
13415e46 220 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
be281e55
ED		 221})
222
2a24444f
ED		 223/* per device and per net counters are atomic_long_t */
224#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
225({ \
226 struct inet6_dev *_idev = (idev); \
227 if (likely(_idev != NULL)) \
228 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
229 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
230})
231
13415e46 232#define _DEVADD(net, statname, mod, idev, field, val) \
8e7999c4
PE		 233({ \
234 struct inet6_dev *_idev = (idev); \
235 if (likely(_idev != NULL)) \
13415e46
ED		 236 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
237 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
8e7999c4
PE		 238})
239
13415e46 240#define _DEVUPD(net, statname, mod, idev, field, val) \
edf391ff
NH		 241({ \
242 struct inet6_dev *_idev = (idev); \
243 if (likely(_idev != NULL)) \
13415e46
ED		 244 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
245 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
edf391ff
NH		 246})
247
14878f75 248/* MIBs */
14878f75 249
087fe240 250#define IP6_INC_STATS(net, idev,field) \
13415e46 251 _DEVINC(net, ipv6, , idev, field)
1d015503 252#define __IP6_INC_STATS(net, idev,field) \
13415e46 253 _DEVINC(net, ipv6, __, idev, field)
edf391ff 254#define IP6_ADD_STATS(net, idev,field,val) \
13415e46 255 _DEVADD(net, ipv6, , idev, field, val)
1d015503 256#define __IP6_ADD_STATS(net, idev,field,val) \
13415e46 257 _DEVADD(net, ipv6, __, idev, field, val)
edf391ff 258#define IP6_UPD_PO_STATS(net, idev,field,val) \
13415e46 259 _DEVUPD(net, ipv6, , idev, field, val)
c2005eb0 260#define __IP6_UPD_PO_STATS(net, idev,field,val) \
13415e46 261 _DEVUPD(net, ipv6, __, idev, field, val)
087fe240 262#define ICMP6_INC_STATS(net, idev, field) \
be281e55 263 _DEVINCATOMIC(net, icmpv6, , idev, field)
a16292a0 264#define __ICMP6_INC_STATS(net, idev, field) \
13415e46 265 _DEVINCATOMIC(net, icmpv6, __, idev, field)
087fe240
DL		 266
267#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
2a24444f 268 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
f3832ed2 269#define ICMP6MSGIN_INC_STATS(net, idev, field) \
2a24444f 270 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
14878f75 271
fd2c3ef7 272struct ip6_ra_chain {
1da177e4
LT		 273 struct ip6_ra_chain *next;
274 struct sock *sk;
275 int sel;
276 void (*destructor)(struct sock *);
277};
278
279extern struct ip6_ra_chain *ip6_ra_chain;
280extern rwlock_t ip6_ra_lock;
281
282/*
283 This structure is prepared by protocol, when parsing
284 ancillary data and passed to IPv6.
285 */
286
fd2c3ef7 287struct ipv6_txoptions {
0aeea21a 288 refcount_t refcnt;
1da177e4
LT		 289 /* Length of this structure */
290 int tot_len;
291
292 /* length of extension headers */
293
294 __u16 opt_flen; /* after fragment hdr */
295 __u16 opt_nflen; /* before fragment hdr */
296
297 struct ipv6_opt_hdr *hopopt;
298 struct ipv6_opt_hdr *dst0opt;
299 struct ipv6_rt_hdr *srcrt; /* Routing Header */
1da177e4 300 struct ipv6_opt_hdr *dst1opt;
45f6fad8 301 struct rcu_head rcu;
1da177e4
LT		 302 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
303};
304
a346abe0
ED		 305/* flowlabel_reflect sysctl values */
306enum flowlabel_reflect {
307 FLOWLABEL_REFLECT_ESTABLISHED = 1,
308 FLOWLABEL_REFLECT_TCP_RESET = 2,
309 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
310};
311
fd2c3ef7 312struct ip6_flowlabel {
7f0e44ac 313 struct ip6_flowlabel __rcu *next;
90bcaf7b 314 __be32 label;
db3459d1 315 atomic_t users;
1da177e4
LT		 316 struct in6_addr dst;
317 struct ipv6_txoptions *opt;
1da177e4 318 unsigned long linger;
d3aedd5e 319 struct rcu_head rcu;
1da177e4 320 u8 share;
4f82f457
EB		 321 union {
322 struct pid *pid;
323 kuid_t uid;
324 } owner;
1da177e4
LT		 325 unsigned long lastuse;
326 unsigned long expires;
60e8fbc4 327 struct net *fl_net;
1da177e4
LT		 328};
329
82a584b7
TH		 330#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
331#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
332#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
333
37cfee90 334#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
d76ed22b 335#define IPV6_TCLASS_SHIFT 20
1da177e4 336
fd2c3ef7 337struct ipv6_fl_socklist {
7f0e44ac
ED		 338 struct ipv6_fl_socklist __rcu *next;
339 struct ip6_flowlabel *fl;
340 struct rcu_head rcu;
1da177e4
LT		 341};
342
26879da5 343struct ipcm6_cookie {
5fdaa88d 344 struct sockcm_cookie sockc;
26879da5
WW		 345 __s16 hlimit;
346 __s16 tclass;
347 __s8 dontfrag;
348 struct ipv6_txoptions *opt;
bec1f6f6 349 __u16 gso_size;
26879da5
WW		 350};
351
b515430a
WB		 352static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
353{
354 *ipc6 = (struct ipcm6_cookie) {
355 .hlimit = -1,
356 .tclass = -1,
357 .dontfrag = -1,
358 };
359}
360
361static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
362 const struct ipv6_pinfo *np)
363{
364 *ipc6 = (struct ipcm6_cookie) {
365 .hlimit = -1,
366 .tclass = np->tclass,
367 .dontfrag = np->dontfrag,
368 };
369}
370
45f6fad8
ED		 371static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
372{
373 struct ipv6_txoptions *opt;
374
375 rcu_read_lock();
376 opt = rcu_dereference(np->opt);
e550785c 377 if (opt) {
0aeea21a 378 if (!refcount_inc_not_zero(&opt->refcnt))
e550785c
BP		 379 opt = NULL;
380 else
381 opt = rcu_pointer_handoff(opt);
382 }
45f6fad8
ED		 383 rcu_read_unlock();
384 return opt;
385}
386
387static inline void txopt_put(struct ipv6_txoptions *opt)
388{
0aeea21a 389 if (opt && refcount_dec_and_test(&opt->refcnt))
45f6fad8
ED		 390 kfree_rcu(opt, rcu);
391}
392
59c820b2
WB		 393struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
394
395extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
396static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
397 __be32 label)
398{
399 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key))
400 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
401
402 return NULL;
403}
404
5c3a0fd7
JP		 405struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
406 struct ip6_flowlabel *fl,
407 struct ipv6_txoptions *fopt);
408void fl6_free_socklist(struct sock *sk);
409int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
46e5f401
FF		 410int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
411 int flags);
5c3a0fd7
JP		 412int ip6_flowlabel_init(void);
413void ip6_flowlabel_cleanup(void);
e9191ffb 414bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
1da177e4
LT		 415
416static inline void fl6_sock_release(struct ip6_flowlabel *fl)
417{
418 if (fl)
419 atomic_dec(&fl->users);
420}
421
5c3a0fd7 422void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
b94f1c09 423
4e64b1ed
JP		 424void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
425 struct icmp6hdr *thdr, int len);
6d0bfe22 426
5c3a0fd7 427int ip6_ra_control(struct sock *sk, int sel);
1da177e4 428
5c3a0fd7 429int ipv6_parse_hopopts(struct sk_buff *skb);
1da177e4 430
5c3a0fd7
JP		 431struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
432 struct ipv6_txoptions *opt);
433struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
434 struct ipv6_txoptions *opt,
435 int newtype,
a9ba23d4 436 struct ipv6_opt_hdr *newopt);
df9890c3
YH		 437struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
438 struct ipv6_txoptions *opt);
1da177e4 439
a224772d
ED		 440bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
441 const struct inet6_skb_parm *opt);
ceba1832
HD		 442struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
443 struct ipv6_txoptions *opt);
399c07de 444
aeaf6e9d
SL		 445static inline bool ipv6_accept_ra(struct inet6_dev *idev)
446{
447 /* If forwarding is enabled, RA are not accepted unless the special
448 * hybrid mode (accept_ra=2) is enabled.
449 */
450 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
451 idev->cnf.accept_ra;
452}
453
c2a93660
JDB		 454#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
455#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
9874c41c 456#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
1da177e4 457
5c3a0fd7 458int __ipv6_addr_type(const struct in6_addr *addr);
b1cacb68
YH		 459static inline int ipv6_addr_type(const struct in6_addr *addr)
460{
461 return __ipv6_addr_type(addr) & 0xffff;
462}
1da177e4
LT		 463
464static inline int ipv6_addr_scope(const struct in6_addr *addr)
465{
b1cacb68
YH		 466 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
467}
468
469static inline int __ipv6_addr_src_scope(int type)
470{
a02cec21 471 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
b1cacb68
YH		 472}
473
474static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
475{
476 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 477}
478
b7ef213e
HFS		 479static inline bool __ipv6_addr_needs_scope_id(int type)
480{
481 return type & IPV6_ADDR_LINKLOCAL ||
482 (type & IPV6_ADDR_MULTICAST &&
483 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
484}
485
486static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
487{
488 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
489}
490
1da177e4
LT		 491static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
492{
db3459d1 493 return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 494}
495
1a203cb3 496static inline bool
f2ffd9ee
PM		 497ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
498 const struct in6_addr *a2)
499{
1a203cb3
ED		 500#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
501 const unsigned long *ul1 = (const unsigned long *)a1;
502 const unsigned long *ulm = (const unsigned long *)m;
503 const unsigned long *ul2 = (const unsigned long *)a2;
504
505 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
506 ((ul1[1] ^ ul2[1]) & ulm[1]));
507#else
a02cec21
ED		 508 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
509 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
510 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
511 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
1a203cb3 512#endif
f2ffd9ee
PM		 513}
514
82695b30 515static inline void ipv6_addr_prefix(struct in6_addr *pfx,
1da177e4
LT		 516 const struct in6_addr *addr,
517 int plen)
518{
519 /* caller must guarantee 0 <= plen <= 128 */
520 int o = plen >> 3,
521 b = plen & 0x7;
522
db3459d1 523 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4 524 memcpy(pfx->s6_addr, addr, o);
db3459d1 525 if (b != 0)
1da177e4 526 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4
LT		 527}
528
818f1f3e
AA		 529static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
530 const struct in6_addr *pfx,
531 int plen)
532{
533 /* caller must guarantee 0 <= plen <= 128 */
534 int o = plen >> 3,
535 b = plen & 0x7;
536
537 memcpy(addr->s6_addr, pfx, o);
538 if (b != 0) {
539 addr->s6_addr[o] &= ~(0xff00 >> b);
540 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
541 }
542}
543
5206c579
YH		 544static inline void __ipv6_addr_set_half(__be32 *addr,
545 __be32 wh, __be32 wl)
546{
547#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
548#if defined(__BIG_ENDIAN)
549 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
550 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
551 return;
552 }
553#elif defined(__LITTLE_ENDIAN)
554 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
555 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
556 return;
557 }
558#endif
559#endif
560 addr[0] = wh;
561 addr[1] = wl;
562}
563
82695b30 564static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 565 __be32 w1, __be32 w2,
566 __be32 w3, __be32 w4)
1da177e4 567{
5206c579
YH		 568 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
569 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
1da177e4 570}
1da177e4 571
92113bfd
ED		 572static inline bool ipv6_addr_equal(const struct in6_addr *a1,
573 const struct in6_addr *a2)
1da177e4 574{
1a203cb3
ED		 575#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
576 const unsigned long *ul1 = (const unsigned long *)a1;
577 const unsigned long *ul2 = (const unsigned long *)a2;
578
579 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
580#else
a02cec21
ED		 581 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
582 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
583 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
584 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
1a203cb3 585#endif
1da177e4
LT		 586}
587
38675170
YH		 588#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
589static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
590 const __be64 *a2,
591 unsigned int len)
592{
512613d7 593 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
38675170
YH		 594 return false;
595 return true;
596}
597
598static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
599 const struct in6_addr *addr2,
600 unsigned int prefixlen)
601{
602 const __be64 *a1 = (const __be64 *)addr1;
603 const __be64 *a2 = (const __be64 *)addr2;
604
605 if (prefixlen >= 64) {
606 if (a1[0] ^ a2[0])
607 return false;
608 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
609 }
610 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
611}
612#else
2ef97332
YH		 613static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
614 const struct in6_addr *addr2,
615 unsigned int prefixlen)
1da177e4 616{
2ef97332
YH		 617 const __be32 *a1 = addr1->s6_addr32;
618 const __be32 *a2 = addr2->s6_addr32;
95c96174 619 unsigned int pdw, pbi;
1da177e4
LT		 620
621 /* check complete u32 in prefix */
622 pdw = prefixlen >> 5;
623 if (pdw && memcmp(a1, a2, pdw << 2))
92113bfd 624 return false;
1da177e4
LT		 625
626 /* check incomplete u32 in prefix */
627 pbi = prefixlen & 0x1f;
628 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
92113bfd 629 return false;
1da177e4 630
92113bfd 631 return true;
1da177e4 632}
38675170 633#endif
1da177e4 634
92113bfd 635static inline bool ipv6_addr_any(const struct in6_addr *a)
1da177e4 636{
1a203cb3
ED		 637#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
638 const unsigned long *ul = (const unsigned long *)a;
639
640 return (ul[0] | ul[1]) == 0UL;
641#else
a02cec21
ED		 642 return (a->s6_addr32[0] | a->s6_addr32[1] |
643 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
1a203cb3 644#endif
1da177e4
LT		 645}
646
ddbe5032
ED		 647static inline u32 ipv6_addr_hash(const struct in6_addr *a)
648{
649#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
650 const unsigned long *ul = (const unsigned long *)a;
651 unsigned long x = ul[0] ^ ul[1];
652
653 return (u32)(x ^ (x >> 32));
654#else
655 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
656 a->s6_addr32[2] ^ a->s6_addr32[3]);
657#endif
658}
659
08dcdbf6 660/* more secured version of ipv6_addr_hash() */
b50026b5 661static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
08dcdbf6
ED		 662{
663 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
664
665 return jhash_3words(v,
666 (__force u32)a->s6_addr32[2],
667 (__force u32)a->s6_addr32[3],
b50026b5 668 initval);
08dcdbf6
ED		 669}
670
92113bfd 671static inline bool ipv6_addr_loopback(const struct in6_addr *a)
f630e43a 672{
e287656b 673#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
1373a773 674 const __be64 *be = (const __be64 *)a;
e287656b 675
1373a773 676 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
e287656b 677#else
a02cec21 678 return (a->s6_addr32[0] | a->s6_addr32[1] |
1373a773 679 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
e287656b 680#endif
f630e43a
YH		 681}
682
1373a773
JL		 683/*
684 * Note that we must __force cast these to unsigned long to make sparse happy,
685 * since all of the endian-annotated types are fixed size regardless of arch.
686 */
92113bfd 687static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
e773e4fa 688{
a04d40b8
YH		 689 return (
690#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
1373a773 691 *(unsigned long *)a |
a04d40b8 692#else
1373a773 693 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
a04d40b8 694#endif
1373a773
JL		 695 (__force unsigned long)(a->s6_addr32[2] ^
696 cpu_to_be32(0x0000ffff))) == 0UL;
e773e4fa
BH		 697}
698
be2644aa
ED		 699static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
700{
701 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
702}
703
f0b1e64c
MKL		 704static inline u32 ipv6_portaddr_hash(const struct net *net,
705 const struct in6_addr *addr6,
706 unsigned int port)
707{
708 unsigned int hash, mix = net_hash_mix(net);
709
710 if (ipv6_addr_any(addr6))
711 hash = jhash_1word(0, mix);
712 else if (ipv6_addr_v4mapped(addr6))
713 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
714 else
715 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
716
717 return hash ^ port;
718}
719
99cd07a5
JMT		 720/*
721 * Check for a RFC 4843 ORCHID address
722 * (Overlay Routable Cryptographic Hash Identifiers)
723 */
92113bfd 724static inline bool ipv6_addr_orchid(const struct in6_addr *a)
99cd07a5 725{
a02cec21 726 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
99cd07a5
JMT		 727}
728
5c98631c
LC		 729static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
730{
731 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
732}
733
f15364bd
AC		 734static inline void ipv6_addr_set_v4mapped(const __be32 addr,
735 struct in6_addr *v4mapped)
736{
737 ipv6_addr_set(v4mapped,
738 0, 0,
739 htonl(0x0000FFFF),
740 addr);
741}
742
971f359d
YH		 743/*
744 * find the first different bit between two addresses
745 * length of address must be a multiple of 32bits
746 */
9f2e7334 747static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
971f359d 748{
ef296f56 749 const __be32 *a1 = token1, *a2 = token2;
971f359d
YH		 750 int i;
751
752 addrlen >>= 2;
753
754 for (i = 0; i < addrlen; i++) {
ef296f56
AV		 755 __be32 xb = a1[i] ^ a2[i];
756 if (xb)
d57b8fb8 757 return i * 32 + 31 - __fls(ntohl(xb));
971f359d
YH		 758 }
759
760 /*
82695b30 761 * we should *never* get to this point since that
971f359d
YH		 762 * would mean the addrs are equal
763 *
764 * However, we do get to it 8) And exacly, when
765 * addresses are equal 8)
766 *
767 * ip route add 1111::/128 via ...
768 * ip route add 1111::/64 via ...
769 * and we are here.
770 *
771 * Ideally, this function should stop comparison
772 * at prefix length. It does not, but it is still OK,
773 * if returned value is greater than prefix length.
774 * --ANK (980803)
775 */
a02cec21 776 return addrlen << 5;
971f359d
YH		 777}
778
9f2e7334
YH		 779#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
780static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
781{
782 const __be64 *a1 = token1, *a2 = token2;
783 int i;
784
785 addrlen >>= 3;
786
787 for (i = 0; i < addrlen; i++) {
788 __be64 xb = a1[i] ^ a2[i];
789 if (xb)
790 return i * 64 + 63 - __fls(be64_to_cpu(xb));
791 }
792
793 return addrlen << 6;
794}
795#endif
796
797static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
798{
799#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
800 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
801 return __ipv6_addr_diff64(token1, token2, addrlen);
802#endif
803 return __ipv6_addr_diff32(token1, token2, addrlen);
804}
805
971f359d
YH		 806static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
807{
808 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
809}
810
7f159867
ED		 811__be32 ipv6_select_ident(struct net *net,
812 const struct in6_addr *daddr,
813 const struct in6_addr *saddr);
0c19f846 814__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
5188cd44 815
5c3a0fd7 816int ip6_dst_hoplimit(struct dst_entry *dst);
3ce9b35f 817
5c98631c
LC		 818static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
819 struct dst_entry *dst)
820{
821 int hlimit;
822
823 if (ipv6_addr_is_multicast(&fl6->daddr))
824 hlimit = np->mcast_hops;
825 else
826 hlimit = np->hop_limit;
827 if (hlimit < 0)
828 hlimit = ip6_dst_hoplimit(dst);
829 return hlimit;
830}
831
c3f83241
TH		 832/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
833 * Equivalent to : flow->v6addrs.src = iph->saddr;
834 * flow->v6addrs.dst = iph->daddr;
835 */
836static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
837 const struct ipv6hdr *iph)
838{
839 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
840 offsetof(typeof(flow->addrs), v6addrs.src) +
841 sizeof(flow->addrs.v6addrs.src));
842 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
843 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
844}
845
a37934fc 846#if IS_ENABLED(CONFIG_IPV6)
42240901 847
db57dc7c
VB		 848static inline bool ipv6_can_nonlocal_bind(struct net *net,
849 struct inet_sock *inet)
850{
851 return net->ipv6.sysctl.ip_nonlocal_bind ||
852 inet->freebind || inet->transparent;
853}
854
42240901
TH		 855/* Sysctl settings for net ipv6.auto_flowlabels */
856#define IP6_AUTO_FLOW_LABEL_OFF 0
857#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
858#define IP6_AUTO_FLOW_LABEL_OPTIN 2
859#define IP6_AUTO_FLOW_LABEL_FORCED 3
860
861#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
862
b5677416 863#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
42240901 864
cb1ce2ef 865static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
67800f9b
TH		 866 __be32 flowlabel, bool autolabel,
867 struct flowi6 *fl6)
cb1ce2ef 868{
42240901 869 u32 hash;
cb1ce2ef 870
90427ef5
DM		 871 /* @flowlabel may include more than a flow label, eg, the traffic class.
872 * Here we want only the flow label value.
873 */
874 flowlabel &= IPV6_FLOWLABEL_MASK;
875
42240901
TH		 876 if (flowlabel ||
877 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
878 (!autolabel &&
879 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
880 return flowlabel;
cb1ce2ef 881
42240901 882 hash = skb_get_hash_flowi6(skb, fl6);
cb1ce2ef 883
42240901
TH		 884 /* Since this is being sent on the wire obfuscate hash a bit
885 * to minimize possbility that any useful information to an
886 * attacker is leaked. Only lower 20 bits are relevant.
887 */
169dc027 888 hash = rol32(hash, 16);
82a584b7 889
42240901
TH		 890 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
891
892 if (net->ipv6.sysctl.flowlabel_state_ranges)
893 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
cb1ce2ef
TH		 894
895 return flowlabel;
896}
42240901
TH		 897
898static inline int ip6_default_np_autolabel(struct net *net)
899{
900 switch (net->ipv6.sysctl.auto_flowlabels) {
901 case IP6_AUTO_FLOW_LABEL_OFF:
902 case IP6_AUTO_FLOW_LABEL_OPTIN:
903 default:
904 return 0;
905 case IP6_AUTO_FLOW_LABEL_OPTOUT:
906 case IP6_AUTO_FLOW_LABEL_FORCED:
907 return 1;
908 }
909}
a37934fc
FF		 910#else
911static inline void ip6_set_txhash(struct sock *sk) { }
912static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
42240901
TH		 913 __be32 flowlabel, bool autolabel,
914 struct flowi6 *fl6)
a37934fc
FF		 915{
916 return flowlabel;
917}
42240901
TH		 918static inline int ip6_default_np_autolabel(struct net *net)
919{
920 return 0;
921}
a37934fc
FF		 922#endif
923
918ee507
PM		 924#if IS_ENABLED(CONFIG_IPV6)
925static inline int ip6_multipath_hash_policy(const struct net *net)
926{
927 return net->ipv6.sysctl.multipath_hash_policy;
928}
929#else
930static inline int ip6_multipath_hash_policy(const struct net *net)
931{
932 return 0;
933}
934#endif
cb1ce2ef 935
3e4e4c1f
YH		 936/*
937 * Header manipulation
938 */
939static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
940 __be32 flowlabel)
941{
07f623d3 942 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
3e4e4c1f
YH		 943}
944
6502ca52
YH		 945static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
946{
947 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
948}
949
3308de2b
FF		 950static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
951{
952 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
953}
954
d76ed22b
LR		 955static inline u8 ip6_tclass(__be32 flowinfo)
956{
957 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
958}
eaa93bf4
DB		 959
960static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
961{
962 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
963}
964
fa1be7e0
MK		 965static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
966{
967 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
968}
969
1da177e4
LT		 970/*
971 * Prototypes exported by ipv6
972 */
973
974/*
975 * rcv function (called from netdevice level)
976 */
977
5c3a0fd7
JP		 978int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
979 struct packet_type *pt, struct net_device *orig_dev);
d8269e2c
EC		 980void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
981 struct net_device *orig_dev);
1da177e4 982
0c4b51f0 983int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
b05e1066 984
1da177e4
LT		 985/*
986 * upper-layer output functions
987 */
1c1e9d2b 988int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
4f6570d7 989 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
5c3a0fd7
JP		 990
991int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
992
993int ip6_append_data(struct sock *sk,
994 int getfrag(void *from, char *to, int offset, int len,
995 int odd, struct sk_buff *skb),
26879da5
WW		 996 void *from, int length, int transhdrlen,
997 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
5fdaa88d 998 struct rt6_info *rt, unsigned int flags);
5c3a0fd7
JP		 999
1000int ip6_push_pending_frames(struct sock *sk);
1001
1002void ip6_flush_pending_frames(struct sock *sk);
1003
6422398c
VY		 1004int ip6_send_skb(struct sk_buff *skb);
1005
1006struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1007 struct inet_cork_full *cork,
1008 struct inet6_cork *v6_cork);
1009struct sk_buff *ip6_make_skb(struct sock *sk,
1010 int getfrag(void *from, char *to, int offset,
1011 int len, int odd, struct sk_buff *skb),
1012 void *from, int length, int transhdrlen,
26879da5
WW		 1013 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1014 struct rt6_info *rt, unsigned int flags,
5fdaa88d 1015 struct inet_cork_full *cork);
6422398c
VY		 1016
1017static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1018{
1019 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1020 &inet6_sk(sk)->cork);
1021}
1022
343d60aa
RP		 1023int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1024 struct flowi6 *fl6);
3aef934f 1025struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
0e0d44ab 1026 const struct in6_addr *final_dst);
5c3a0fd7 1027struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
96818159
AK		 1028 const struct in6_addr *final_dst,
1029 bool connected);
5c3a0fd7
JP		 1030struct dst_entry *ip6_blackhole_route(struct net *net,
1031 struct dst_entry *orig_dst);
1da177e4
LT		 1032
1033/*
1034 * skb processing functions
1035 */
1036
ede2059d 1037int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
5c3a0fd7
JP		 1038int ip6_forward(struct sk_buff *skb);
1039int ip6_input(struct sk_buff *skb);
1040int ip6_mc_input(struct sk_buff *skb);
80bde363
PA		 1041void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1042 bool have_final);
1da177e4 1043
cf91a99d 1044int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
33224b16 1045int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
ef76bc23 1046
1da177e4
LT		 1047/*
1048 * Extension header (options) processing
1049 */
1050
5c3a0fd7 1051void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
613fa3ca
DL		 1052 u8 *proto, struct in6_addr **daddr_p,
1053 struct in6_addr *saddr);
5c3a0fd7
JP		 1054void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1055 u8 *proto);
1da177e4 1056
5c3a0fd7
JP		 1057int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1058 __be16 *frag_offp);
1da177e4 1059
5c3a0fd7 1060bool ipv6_ext_hdr(u8 nexthdr);
1da177e4 1061
f8f62675 1062enum {
9195bb8e
AA		 1063 IP6_FH_F_FRAG = (1 << 0),
1064 IP6_FH_F_AUTH = (1 << 1),
1065 IP6_FH_F_SKIP_RH = (1 << 2),
f8f62675
JG		 1066};
1067
1068/* find specified header and get offset to it */
5c3a0fd7
JP		 1069int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1070 unsigned short *fragoff, int *fragflg);
f8f62675 1071
0868383b 1072int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
c61a4043 1073
5c3a0fd7
JP		 1074struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1075 const struct ipv6_txoptions *opt,
1076 struct in6_addr *orig);
20c59de2 1077
1da177e4
LT		 1078/*
1079 * socket options (ipv6_sockglue.c)
1080 */
1081
5c3a0fd7
JP		 1082int ipv6_setsockopt(struct sock *sk, int level, int optname,
1083 char __user *optval, unsigned int optlen);
1084int ipv6_getsockopt(struct sock *sk, int level, int optname,
1085 char __user *optval, int __user *optlen);
1086int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
1087 char __user *optval, unsigned int optlen);
1088int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1089 char __user *optval, int __user *optlen);
1090
0382a25a
GN		 1091int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1092 int addr_len);
5c3a0fd7 1093int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
82b276cd
HFS		 1094int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1095 int addr_len);
33c162a9 1096int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
e646b657 1097void ip6_datagram_release_cb(struct sock *sk);
5c3a0fd7 1098
85fbaa75
HFS		 1099int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1100 int *addr_len);
1101int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1102 int *addr_len);
5c3a0fd7
JP		 1103void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1104 u32 info, u8 *payload);
1105void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1106void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1107
1108int inet6_release(struct socket *sock);
1109int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
9b2c45d4 1110int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
5c3a0fd7
JP		 1111 int peer);
1112int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1113
1114int inet6_hash_connect(struct inet_timewait_death_row *death_row,
d8313f5c
ACM		 1115 struct sock *sk);
1116
1da177e4
LT		 1117/*
1118 * reassembly.c
1119 */
90ddc4f0
ED		 1120extern const struct proto_ops inet6_stream_ops;
1121extern const struct proto_ops inet6_dgram_ops;
77d4b1d3 1122extern const struct proto_ops inet6_sockraw_ops;
20380731 1123
14c85021
ACM		 1124struct group_source_req;
1125struct group_filter;
1126
5c3a0fd7
JP		 1127int ip6_mc_source(int add, int omode, struct sock *sk,
1128 struct group_source_req *pgsr);
1129int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1130int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1131 struct group_filter __user *optval, int __user *optlen);
20380731
ACM		 1132
1133#ifdef CONFIG_PROC_FS
5c3a0fd7
JP		 1134int ac6_proc_init(struct net *net);
1135void ac6_proc_exit(struct net *net);
1136int raw6_proc_init(void);
1137void raw6_proc_exit(void);
1138int tcp6_proc_init(struct net *net);
1139void tcp6_proc_exit(struct net *net);
1140int udp6_proc_init(struct net *net);
1141void udp6_proc_exit(struct net *net);
1142int udplite6_proc_init(void);
1143void udplite6_proc_exit(void);
1144int ipv6_misc_proc_init(void);
1145void ipv6_misc_proc_exit(void);
1146int snmp6_register_dev(struct inet6_dev *idev);
1147int snmp6_unregister_dev(struct inet6_dev *idev);
20380731 1148
7f7d9a6b 1149#else
6ab57e7e
DL		 1150static inline int ac6_proc_init(struct net *net) { return 0; }
1151static inline void ac6_proc_exit(struct net *net) { }
1152static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1153static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
20380731 1154#endif
1da177e4 1155
20380731 1156#ifdef CONFIG_SYSCTL
5c3a0fd7
JP		 1157struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1158struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1159int ipv6_sysctl_register(void);
1160void ipv6_sysctl_unregister(void);
20380731 1161#endif
1da177e4 1162
46a4dee0
MC		 1163int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1164 const struct in6_addr *addr);
c7ea20c9
HL		 1165int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1166 const struct in6_addr *addr, unsigned int mode);
46a4dee0
MC		 1167int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1168 const struct in6_addr *addr);
20380731 1169#endif /* _NET_IPV6_H */
Linux 6.x block layer and io_uring tree(s)