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media: dvb_frontend: add missing DSS switch cases
[linux-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 18#include <net/flow.h>
1bd758eb 19#include <net/flow_dissector.h>
a410a0cf 20#include <net/inet_dscp.h>
1da177e4 21#include <net/snmp.h>
f0b1e64c 22#include <net/netns/hash.h>
1da177e4 23
b6459415
JK		 24struct ip_tunnel_info;
25
1da177e4
LT		 26#define SIN6_LEN_RFC2133 24
27
28#define IPV6_MAXPLEN 65535
29
30/*
31 * NextHeader field of IPv6 header
32 */
33
34#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
ee90c6ba 35#define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */
1da177e4
LT		 36#define NEXTHDR_TCP 6 /* TCP segment. */
37#define NEXTHDR_UDP 17 /* UDP message. */
38#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
39#define NEXTHDR_ROUTING 43 /* Routing header. */
40#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
c12b395a 41#define NEXTHDR_GRE 47 /* GRE header. */
1da177e4
LT		 42#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
43#define NEXTHDR_AUTH 51 /* Authentication header. */
44#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
45#define NEXTHDR_NONE 59 /* No next header */
46#define NEXTHDR_DEST 60 /* Destination options header. */
280c571e 47#define NEXTHDR_SCTP 132 /* SCTP message. */
2b741653 48#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4
LT		 49
50#define NEXTHDR_MAX 255
51
1da177e4
LT		 52#define IPV6_DEFAULT_HOPLIMIT 64
53#define IPV6_DEFAULT_MCASTHOPS 1
54
47d3d7ac
TH		 55/* Limits on Hop-by-Hop and Destination options.
56 *
57 * Per RFC8200 there is no limit on the maximum number or lengths of options in
58 * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
59 * We allow configurable limits in order to mitigate potential denial of
60 * service attacks.
61 *
62 * There are three limits that may be set:
63 * - Limit the number of options in a Hop-by-Hop or Destination options
64 * extension header
65 * - Limit the byte length of a Hop-by-Hop or Destination options extension
66 * header
67 * - Disallow unknown options
68 *
69 * The limits are expressed in corresponding sysctls:
70 *
71 * ipv6.sysctl.max_dst_opts_cnt
72 * ipv6.sysctl.max_hbh_opts_cnt
73 * ipv6.sysctl.max_dst_opts_len
74 * ipv6.sysctl.max_hbh_opts_len
75 *
76 * max_*_opts_cnt is the number of TLVs that are allowed for Destination
77 * options or Hop-by-Hop options. If the number is less than zero then unknown
78 * TLVs are disallowed and the number of known options that are allowed is the
79 * absolute value. Setting the value to INT_MAX indicates no limit.
80 *
81 * max_*_opts_len is the length limit in bytes of a Destination or
82 * Hop-by-Hop options extension header. Setting the value to INT_MAX
83 * indicates no length limit.
84 *
85 * If a limit is exceeded when processing an extension header the packet is
86 * silently discarded.
87 */
88
89/* Default limits for Hop-by-Hop and Destination options */
90#define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
91#define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
92#define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */
93#define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
94
1da177e4
LT		 95/*
96 * Addr type
97 *
98 * type - unicast | multicast
99 * scope - local | site | global
100 * v4 - compat
101 * v4mapped
102 * any
103 * loopback
104 */
105
106#define IPV6_ADDR_ANY 0x0000U
107
82695b30
SH		 108#define IPV6_ADDR_UNICAST 0x0001U
109#define IPV6_ADDR_MULTICAST 0x0002U
1da177e4
LT		 110
111#define IPV6_ADDR_LOOPBACK 0x0010U
112#define IPV6_ADDR_LINKLOCAL 0x0020U
113#define IPV6_ADDR_SITELOCAL 0x0040U
114
115#define IPV6_ADDR_COMPATv4 0x0080U
116
117#define IPV6_ADDR_SCOPE_MASK 0x00f0U
118
119#define IPV6_ADDR_MAPPED 0x1000U
1da177e4
LT		 120
121/*
122 * Addr scopes
123 */
1da177e4
LT		 124#define IPV6_ADDR_MC_SCOPE(a) \
125 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
126#define __IPV6_ADDR_SCOPE_INVALID -1
1da177e4
LT		 127#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
128#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
129#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
130#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
131#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
132
5ced1339
LL		 133/*
134 * Addr flags
135 */
5ced1339
LL		 136#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
137 ((a)->s6_addr[1] & 0x10)
138#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
139 ((a)->s6_addr[1] & 0x20)
140#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
141 ((a)->s6_addr[1] & 0x40)
5ced1339 142
1da177e4
LT		 143/*
144 * fragmentation header
145 */
146
147struct frag_hdr {
44473a6b
AV		 148 __u8 nexthdr;
149 __u8 reserved;
150 __be16 frag_off;
151 __be32 identification;
1da177e4
LT		 152};
153
7c96d8ec
ED		 154/*
155 * Jumbo payload option, as described in RFC 2675 2.
156 */
157struct hop_jumbo_hdr {
158 u8 nexthdr;
159 u8 hdrlen;
160 u8 tlv_type; /* IPV6_TLV_JUMBO, 0xC2 */
161 u8 tlv_len; /* 4 */
162 __be32 jumbo_payload_len;
163};
164
1431fb31
PD		 165#define IP6_MF 0x0001
166#define IP6_OFFSET 0xFFF8
1da177e4 167
0feca619
PNA		 168struct ip6_fraglist_iter {
169 struct ipv6hdr *tmp_hdr;
0feca619
PNA		 170 struct sk_buff *frag;
171 int offset;
172 unsigned int hlen;
173 __be32 frag_id;
174 u8 nexthdr;
175};
176
177int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
178 u8 nexthdr, __be32 frag_id,
179 struct ip6_fraglist_iter *iter);
180void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
181
182static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
183{
184 struct sk_buff *skb = iter->frag;
185
186 iter->frag = skb->next;
187 skb_mark_not_on_list(skb);
188
189 return skb;
190}
191
8a6a1f17
PNA		 192struct ip6_frag_state {
193 u8 *prevhdr;
194 unsigned int hlen;
195 unsigned int mtu;
196 unsigned int left;
197 int offset;
198 int ptr;
199 int hroom;
200 int troom;
201 __be32 frag_id;
202 u8 nexthdr;
203};
204
205void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
206 unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
207 u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
208struct sk_buff *ip6_frag_next(struct sk_buff *skb,
209 struct ip6_frag_state *state);
210
e110861f
LC		 211#define IP6_REPLY_MARK(net, mark) \
212 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
213
1da177e4
LT		 214#include <net/sock.h>
215
216/* sysctls */
1da177e4 217extern int sysctl_mld_max_msf;
2f711939 218extern int sysctl_mld_qrv;
3d7cc2ba 219
13415e46 220#define _DEVINC(net, statname, mod, idev, field) \
14878f75 221({ \
a11d206d
YH		 222 struct inet6_dev *_idev = (idev); \
223 if (likely(_idev != NULL)) \
13415e46
ED		 224 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
225 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
a11d206d 226})
14878f75 227
be281e55 228/* per device counters are atomic_long_t */
13415e46 229#define _DEVINCATOMIC(net, statname, mod, idev, field) \
be281e55
ED		 230({ \
231 struct inet6_dev *_idev = (idev); \
232 if (likely(_idev != NULL)) \
233 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
13415e46 234 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
be281e55
ED		 235})
236
2a24444f
ED		 237/* per device and per net counters are atomic_long_t */
238#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
239({ \
240 struct inet6_dev *_idev = (idev); \
241 if (likely(_idev != NULL)) \
242 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
243 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
244})
245
13415e46 246#define _DEVADD(net, statname, mod, idev, field, val) \
8e7999c4
PE		 247({ \
248 struct inet6_dev *_idev = (idev); \
249 if (likely(_idev != NULL)) \
13415e46
ED		 250 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
251 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
8e7999c4
PE		 252})
253
13415e46 254#define _DEVUPD(net, statname, mod, idev, field, val) \
edf391ff
NH		 255({ \
256 struct inet6_dev *_idev = (idev); \
257 if (likely(_idev != NULL)) \
13415e46
ED		 258 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
259 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
edf391ff
NH		 260})
261
14878f75 262/* MIBs */
14878f75 263
087fe240 264#define IP6_INC_STATS(net, idev,field) \
13415e46 265 _DEVINC(net, ipv6, , idev, field)
1d015503 266#define __IP6_INC_STATS(net, idev,field) \
13415e46 267 _DEVINC(net, ipv6, __, idev, field)
edf391ff 268#define IP6_ADD_STATS(net, idev,field,val) \
13415e46 269 _DEVADD(net, ipv6, , idev, field, val)
1d015503 270#define __IP6_ADD_STATS(net, idev,field,val) \
13415e46 271 _DEVADD(net, ipv6, __, idev, field, val)
edf391ff 272#define IP6_UPD_PO_STATS(net, idev,field,val) \
13415e46 273 _DEVUPD(net, ipv6, , idev, field, val)
c2005eb0 274#define __IP6_UPD_PO_STATS(net, idev,field,val) \
13415e46 275 _DEVUPD(net, ipv6, __, idev, field, val)
087fe240 276#define ICMP6_INC_STATS(net, idev, field) \
be281e55 277 _DEVINCATOMIC(net, icmpv6, , idev, field)
a16292a0 278#define __ICMP6_INC_STATS(net, idev, field) \
13415e46 279 _DEVINCATOMIC(net, icmpv6, __, idev, field)
087fe240
DL		 280
281#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
2a24444f 282 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
f3832ed2 283#define ICMP6MSGIN_INC_STATS(net, idev, field) \
2a24444f 284 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
14878f75 285
fd2c3ef7 286struct ip6_ra_chain {
1da177e4
LT		 287 struct ip6_ra_chain *next;
288 struct sock *sk;
289 int sel;
290 void (*destructor)(struct sock *);
291};
292
293extern struct ip6_ra_chain *ip6_ra_chain;
294extern rwlock_t ip6_ra_lock;
295
296/*
297 This structure is prepared by protocol, when parsing
298 ancillary data and passed to IPv6.
299 */
300
fd2c3ef7 301struct ipv6_txoptions {
0aeea21a 302 refcount_t refcnt;
1da177e4
LT		 303 /* Length of this structure */
304 int tot_len;
305
306 /* length of extension headers */
307
308 __u16 opt_flen; /* after fragment hdr */
309 __u16 opt_nflen; /* before fragment hdr */
310
311 struct ipv6_opt_hdr *hopopt;
312 struct ipv6_opt_hdr *dst0opt;
313 struct ipv6_rt_hdr *srcrt; /* Routing Header */
1da177e4 314 struct ipv6_opt_hdr *dst1opt;
45f6fad8 315 struct rcu_head rcu;
1da177e4
LT		 316 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
317};
318
a346abe0
ED		 319/* flowlabel_reflect sysctl values */
320enum flowlabel_reflect {
321 FLOWLABEL_REFLECT_ESTABLISHED = 1,
322 FLOWLABEL_REFLECT_TCP_RESET = 2,
323 FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,
324};
325
fd2c3ef7 326struct ip6_flowlabel {
7f0e44ac 327 struct ip6_flowlabel __rcu *next;
90bcaf7b 328 __be32 label;
db3459d1 329 atomic_t users;
1da177e4
LT		 330 struct in6_addr dst;
331 struct ipv6_txoptions *opt;
1da177e4 332 unsigned long linger;
d3aedd5e 333 struct rcu_head rcu;
1da177e4 334 u8 share;
4f82f457
EB		 335 union {
336 struct pid *pid;
337 kuid_t uid;
338 } owner;
1da177e4
LT		 339 unsigned long lastuse;
340 unsigned long expires;
60e8fbc4 341 struct net *fl_net;
1da177e4
LT		 342};
343
82a584b7
TH		 344#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
345#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
346#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
347
37cfee90 348#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
d76ed22b 349#define IPV6_TCLASS_SHIFT 20
1da177e4 350
fd2c3ef7 351struct ipv6_fl_socklist {
7f0e44ac
ED		 352 struct ipv6_fl_socklist __rcu *next;
353 struct ip6_flowlabel *fl;
354 struct rcu_head rcu;
1da177e4
LT		 355};
356
26879da5 357struct ipcm6_cookie {
5fdaa88d 358 struct sockcm_cookie sockc;
26879da5
WW		 359 __s16 hlimit;
360 __s16 tclass;
1b31debc 361 __u16 gso_size;
26879da5
WW		 362 __s8 dontfrag;
363 struct ipv6_txoptions *opt;
364};
365
b515430a
WB		 366static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
367{
368 *ipc6 = (struct ipcm6_cookie) {
369 .hlimit = -1,
370 .tclass = -1,
371 .dontfrag = -1,
372 };
373}
374
375static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
376 const struct ipv6_pinfo *np)
377{
378 *ipc6 = (struct ipcm6_cookie) {
379 .hlimit = -1,
380 .tclass = np->tclass,
381 .dontfrag = np->dontfrag,
382 };
383}
384
45f6fad8
ED		 385static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
386{
387 struct ipv6_txoptions *opt;
388
389 rcu_read_lock();
390 opt = rcu_dereference(np->opt);
e550785c 391 if (opt) {
0aeea21a 392 if (!refcount_inc_not_zero(&opt->refcnt))
e550785c
BP		 393 opt = NULL;
394 else
395 opt = rcu_pointer_handoff(opt);
396 }
45f6fad8
ED		 397 rcu_read_unlock();
398 return opt;
399}
400
401static inline void txopt_put(struct ipv6_txoptions *opt)
402{
0aeea21a 403 if (opt && refcount_dec_and_test(&opt->refcnt))
45f6fad8
ED		 404 kfree_rcu(opt, rcu);
405}
406
0b0dff5b 407#if IS_ENABLED(CONFIG_IPV6)
59c820b2
WB		 408struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
409
410extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
411static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
412 __be32 label)
413{
0b0dff5b
WB		 414 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
415 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
59c820b2
WB		 416 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
417
418 return NULL;
419}
0b0dff5b 420#endif
59c820b2 421
5c3a0fd7
JP		 422struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
423 struct ip6_flowlabel *fl,
424 struct ipv6_txoptions *fopt);
425void fl6_free_socklist(struct sock *sk);
86298285 426int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
46e5f401
FF		 427int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
428 int flags);
5c3a0fd7
JP		 429int ip6_flowlabel_init(void);
430void ip6_flowlabel_cleanup(void);
e9191ffb 431bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
1da177e4
LT		 432
433static inline void fl6_sock_release(struct ip6_flowlabel *fl)
434{
435 if (fl)
436 atomic_dec(&fl->users);
437}
438
5c3a0fd7 439void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
b94f1c09 440
4e64b1ed
JP		 441void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
442 struct icmp6hdr *thdr, int len);
6d0bfe22 443
5c3a0fd7 444int ip6_ra_control(struct sock *sk, int sel);
1da177e4 445
5c3a0fd7 446int ipv6_parse_hopopts(struct sk_buff *skb);
1da177e4 447
5c3a0fd7
JP		 448struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
449 struct ipv6_txoptions *opt);
450struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
451 struct ipv6_txoptions *opt,
452 int newtype,
a9ba23d4 453 struct ipv6_opt_hdr *newopt);
31ed2261
PB		 454struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
455 struct ipv6_txoptions *opt);
456
457static inline struct ipv6_txoptions *
458ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
459{
460 if (!opt)
461 return NULL;
462 return __ipv6_fixup_options(opt_space, opt);
463}
1da177e4 464
a224772d
ED		 465bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
466 const struct inet6_skb_parm *opt);
ceba1832
HD		 467struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
468 struct ipv6_txoptions *opt);
399c07de 469
09f3d1a3
ED		 470/* This helper is specialized for BIG TCP needs.
471 * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header.
472 * It assumes headers are already in skb->head.
473 * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there.
474 */
475static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb)
476{
477 const struct hop_jumbo_hdr *jhdr;
478 const struct ipv6hdr *nhdr;
479
0fe79f28 480 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))
09f3d1a3
ED		 481 return 0;
482
483 if (skb->protocol != htons(ETH_P_IPV6))
484 return 0;
485
486 if (skb_network_offset(skb) +
487 sizeof(struct ipv6hdr) +
488 sizeof(struct hop_jumbo_hdr) > skb_headlen(skb))
489 return 0;
490
491 nhdr = ipv6_hdr(skb);
492
493 if (nhdr->nexthdr != NEXTHDR_HOP)
494 return 0;
495
496 jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1);
497 if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 ||
498 jhdr->nexthdr != IPPROTO_TCP)
499 return 0;
500 return jhdr->nexthdr;
501}
502
aeaf6e9d
SL		 503static inline bool ipv6_accept_ra(struct inet6_dev *idev)
504{
505 /* If forwarding is enabled, RA are not accepted unless the special
506 * hybrid mode (accept_ra=2) is enabled.
507 */
508 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
509 idev->cnf.accept_ra;
510}
511
c2a93660
JDB		 512#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
513#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
9874c41c 514#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
1da177e4 515
5c3a0fd7 516int __ipv6_addr_type(const struct in6_addr *addr);
b1cacb68
YH		 517static inline int ipv6_addr_type(const struct in6_addr *addr)
518{
519 return __ipv6_addr_type(addr) & 0xffff;
520}
1da177e4
LT		 521
522static inline int ipv6_addr_scope(const struct in6_addr *addr)
523{
b1cacb68
YH		 524 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
525}
526
527static inline int __ipv6_addr_src_scope(int type)
528{
a02cec21 529 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
b1cacb68
YH		 530}
531
532static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
533{
534 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 535}
536
b7ef213e
HFS		 537static inline bool __ipv6_addr_needs_scope_id(int type)
538{
539 return type & IPV6_ADDR_LINKLOCAL ||
540 (type & IPV6_ADDR_MULTICAST &&
541 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
542}
543
544static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
545{
546 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
547}
548
1da177e4
LT		 549static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
550{
db3459d1 551 return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 552}
553
1a203cb3 554static inline bool
f2ffd9ee
PM		 555ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
556 const struct in6_addr *a2)
557{
1a203cb3
ED		 558#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
559 const unsigned long *ul1 = (const unsigned long *)a1;
560 const unsigned long *ulm = (const unsigned long *)m;
561 const unsigned long *ul2 = (const unsigned long *)a2;
562
563 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
564 ((ul1[1] ^ ul2[1]) & ulm[1]));
565#else
a02cec21
ED		 566 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
567 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
568 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
569 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
1a203cb3 570#endif
f2ffd9ee
PM		 571}
572
82695b30 573static inline void ipv6_addr_prefix(struct in6_addr *pfx,
1da177e4
LT		 574 const struct in6_addr *addr,
575 int plen)
576{
577 /* caller must guarantee 0 <= plen <= 128 */
578 int o = plen >> 3,
579 b = plen & 0x7;
580
db3459d1 581 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4 582 memcpy(pfx->s6_addr, addr, o);
db3459d1 583 if (b != 0)
1da177e4 584 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4
LT		 585}
586
818f1f3e
AA		 587static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
588 const struct in6_addr *pfx,
589 int plen)
590{
591 /* caller must guarantee 0 <= plen <= 128 */
592 int o = plen >> 3,
593 b = plen & 0x7;
594
595 memcpy(addr->s6_addr, pfx, o);
596 if (b != 0) {
597 addr->s6_addr[o] &= ~(0xff00 >> b);
598 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
599 }
600}
601
5206c579
YH		 602static inline void __ipv6_addr_set_half(__be32 *addr,
603 __be32 wh, __be32 wl)
604{
605#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
606#if defined(__BIG_ENDIAN)
607 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
608 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
609 return;
610 }
611#elif defined(__LITTLE_ENDIAN)
612 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
613 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
614 return;
615 }
616#endif
617#endif
618 addr[0] = wh;
619 addr[1] = wl;
620}
621
82695b30 622static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 623 __be32 w1, __be32 w2,
624 __be32 w3, __be32 w4)
1da177e4 625{
5206c579
YH		 626 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
627 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
1da177e4 628}
1da177e4 629
92113bfd
ED		 630static inline bool ipv6_addr_equal(const struct in6_addr *a1,
631 const struct in6_addr *a2)
1da177e4 632{
1a203cb3
ED		 633#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
634 const unsigned long *ul1 = (const unsigned long *)a1;
635 const unsigned long *ul2 = (const unsigned long *)a2;
636
637 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
638#else
a02cec21
ED		 639 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
640 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
641 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
642 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
1a203cb3 643#endif
1da177e4
LT		 644}
645
38675170
YH		 646#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
647static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
648 const __be64 *a2,
649 unsigned int len)
650{
512613d7 651 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
38675170
YH		 652 return false;
653 return true;
654}
655
656static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
657 const struct in6_addr *addr2,
658 unsigned int prefixlen)
659{
660 const __be64 *a1 = (const __be64 *)addr1;
661 const __be64 *a2 = (const __be64 *)addr2;
662
663 if (prefixlen >= 64) {
664 if (a1[0] ^ a2[0])
665 return false;
666 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
667 }
668 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
669}
670#else
2ef97332
YH		 671static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
672 const struct in6_addr *addr2,
673 unsigned int prefixlen)
1da177e4 674{
2ef97332
YH		 675 const __be32 *a1 = addr1->s6_addr32;
676 const __be32 *a2 = addr2->s6_addr32;
95c96174 677 unsigned int pdw, pbi;
1da177e4
LT		 678
679 /* check complete u32 in prefix */
680 pdw = prefixlen >> 5;
681 if (pdw && memcmp(a1, a2, pdw << 2))
92113bfd 682 return false;
1da177e4
LT		 683
684 /* check incomplete u32 in prefix */
685 pbi = prefixlen & 0x1f;
686 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
92113bfd 687 return false;
1da177e4 688
92113bfd 689 return true;
1da177e4 690}
38675170 691#endif
1da177e4 692
92113bfd 693static inline bool ipv6_addr_any(const struct in6_addr *a)
1da177e4 694{
1a203cb3
ED		 695#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
696 const unsigned long *ul = (const unsigned long *)a;
697
698 return (ul[0] | ul[1]) == 0UL;
699#else
a02cec21
ED		 700 return (a->s6_addr32[0] | a->s6_addr32[1] |
701 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
1a203cb3 702#endif
1da177e4
LT		 703}
704
ddbe5032
ED		 705static inline u32 ipv6_addr_hash(const struct in6_addr *a)
706{
707#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
708 const unsigned long *ul = (const unsigned long *)a;
709 unsigned long x = ul[0] ^ ul[1];
710
711 return (u32)(x ^ (x >> 32));
712#else
713 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
714 a->s6_addr32[2] ^ a->s6_addr32[3]);
715#endif
716}
717
08dcdbf6 718/* more secured version of ipv6_addr_hash() */
b50026b5 719static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
08dcdbf6
ED		 720{
721 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
722
723 return jhash_3words(v,
724 (__force u32)a->s6_addr32[2],
725 (__force u32)a->s6_addr32[3],
b50026b5 726 initval);
08dcdbf6
ED		 727}
728
92113bfd 729static inline bool ipv6_addr_loopback(const struct in6_addr *a)
f630e43a 730{
e287656b 731#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
1373a773 732 const __be64 *be = (const __be64 *)a;
e287656b 733
1373a773 734 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
e287656b 735#else
a02cec21 736 return (a->s6_addr32[0] | a->s6_addr32[1] |
1373a773 737 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
e287656b 738#endif
f630e43a
YH		 739}
740
1373a773
JL		 741/*
742 * Note that we must __force cast these to unsigned long to make sparse happy,
743 * since all of the endian-annotated types are fixed size regardless of arch.
744 */
92113bfd 745static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
e773e4fa 746{
a04d40b8
YH		 747 return (
748#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
1373a773 749 *(unsigned long *)a |
a04d40b8 750#else
1373a773 751 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
a04d40b8 752#endif
1373a773
JL		 753 (__force unsigned long)(a->s6_addr32[2] ^
754 cpu_to_be32(0x0000ffff))) == 0UL;
e773e4fa
BH		 755}
756
be2644aa
ED		 757static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
758{
759 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
760}
761
f0b1e64c
MKL		 762static inline u32 ipv6_portaddr_hash(const struct net *net,
763 const struct in6_addr *addr6,
764 unsigned int port)
765{
766 unsigned int hash, mix = net_hash_mix(net);
767
768 if (ipv6_addr_any(addr6))
769 hash = jhash_1word(0, mix);
770 else if (ipv6_addr_v4mapped(addr6))
771 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
772 else
773 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
774
775 return hash ^ port;
776}
777
99cd07a5
JMT		 778/*
779 * Check for a RFC 4843 ORCHID address
780 * (Overlay Routable Cryptographic Hash Identifiers)
781 */
92113bfd 782static inline bool ipv6_addr_orchid(const struct in6_addr *a)
99cd07a5 783{
a02cec21 784 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
99cd07a5
JMT		 785}
786
5c98631c
LC		 787static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
788{
789 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
790}
791
f15364bd
AC		 792static inline void ipv6_addr_set_v4mapped(const __be32 addr,
793 struct in6_addr *v4mapped)
794{
795 ipv6_addr_set(v4mapped,
796 0, 0,
797 htonl(0x0000FFFF),
798 addr);
799}
800
971f359d
YH		 801/*
802 * find the first different bit between two addresses
803 * length of address must be a multiple of 32bits
804 */
9f2e7334 805static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
971f359d 806{
ef296f56 807 const __be32 *a1 = token1, *a2 = token2;
971f359d
YH		 808 int i;
809
810 addrlen >>= 2;
811
812 for (i = 0; i < addrlen; i++) {
ef296f56
AV		 813 __be32 xb = a1[i] ^ a2[i];
814 if (xb)
d57b8fb8 815 return i * 32 + 31 - __fls(ntohl(xb));
971f359d
YH		 816 }
817
818 /*
82695b30 819 * we should *never* get to this point since that
971f359d
YH		 820 * would mean the addrs are equal
821 *
822 * However, we do get to it 8) And exacly, when
823 * addresses are equal 8)
824 *
825 * ip route add 1111::/128 via ...
826 * ip route add 1111::/64 via ...
827 * and we are here.
828 *
829 * Ideally, this function should stop comparison
830 * at prefix length. It does not, but it is still OK,
831 * if returned value is greater than prefix length.
832 * --ANK (980803)
833 */
a02cec21 834 return addrlen << 5;
971f359d
YH		 835}
836
9f2e7334
YH		 837#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
838static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
839{
840 const __be64 *a1 = token1, *a2 = token2;
841 int i;
842
843 addrlen >>= 3;
844
845 for (i = 0; i < addrlen; i++) {
846 __be64 xb = a1[i] ^ a2[i];
847 if (xb)
848 return i * 64 + 63 - __fls(be64_to_cpu(xb));
849 }
850
851 return addrlen << 6;
852}
853#endif
854
855static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
856{
857#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
858 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
859 return __ipv6_addr_diff64(token1, token2, addrlen);
860#endif
861 return __ipv6_addr_diff32(token1, token2, addrlen);
862}
863
971f359d
YH		 864static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
865{
866 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
867}
868
7f159867
ED		 869__be32 ipv6_select_ident(struct net *net,
870 const struct in6_addr *daddr,
871 const struct in6_addr *saddr);
0c19f846 872__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
5188cd44 873
5c3a0fd7 874int ip6_dst_hoplimit(struct dst_entry *dst);
3ce9b35f 875
5c98631c
LC		 876static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
877 struct dst_entry *dst)
878{
879 int hlimit;
880
881 if (ipv6_addr_is_multicast(&fl6->daddr))
882 hlimit = np->mcast_hops;
883 else
884 hlimit = np->hop_limit;
885 if (hlimit < 0)
886 hlimit = ip6_dst_hoplimit(dst);
887 return hlimit;
888}
889
c3f83241
TH		 890/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
891 * Equivalent to : flow->v6addrs.src = iph->saddr;
892 * flow->v6addrs.dst = iph->daddr;
893 */
894static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
895 const struct ipv6hdr *iph)
896{
897 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
898 offsetof(typeof(flow->addrs), v6addrs.src) +
899 sizeof(flow->addrs.v6addrs.src));
900 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
901 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
902}
903
a37934fc 904#if IS_ENABLED(CONFIG_IPV6)
42240901 905
db57dc7c
VB		 906static inline bool ipv6_can_nonlocal_bind(struct net *net,
907 struct inet_sock *inet)
908{
909 return net->ipv6.sysctl.ip_nonlocal_bind ||
910 inet->freebind || inet->transparent;
911}
912
42240901
TH		 913/* Sysctl settings for net ipv6.auto_flowlabels */
914#define IP6_AUTO_FLOW_LABEL_OFF 0
915#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
916#define IP6_AUTO_FLOW_LABEL_OPTIN 2
917#define IP6_AUTO_FLOW_LABEL_FORCED 3
918
919#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
920
b5677416 921#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
42240901 922
cb1ce2ef 923static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
67800f9b
TH		 924 __be32 flowlabel, bool autolabel,
925 struct flowi6 *fl6)
cb1ce2ef 926{
42240901 927 u32 hash;
cb1ce2ef 928
90427ef5
DM		 929 /* @flowlabel may include more than a flow label, eg, the traffic class.
930 * Here we want only the flow label value.
931 */
932 flowlabel &= IPV6_FLOWLABEL_MASK;
933
42240901
TH		 934 if (flowlabel ||
935 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
936 (!autolabel &&
937 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
938 return flowlabel;
cb1ce2ef 939
42240901 940 hash = skb_get_hash_flowi6(skb, fl6);
cb1ce2ef 941
42240901
TH		 942 /* Since this is being sent on the wire obfuscate hash a bit
943 * to minimize possbility that any useful information to an
944 * attacker is leaked. Only lower 20 bits are relevant.
945 */
169dc027 946 hash = rol32(hash, 16);
82a584b7 947
42240901
TH		 948 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
949
950 if (net->ipv6.sysctl.flowlabel_state_ranges)
951 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
cb1ce2ef
TH		 952
953 return flowlabel;
954}
42240901
TH		 955
956static inline int ip6_default_np_autolabel(struct net *net)
957{
958 switch (net->ipv6.sysctl.auto_flowlabels) {
959 case IP6_AUTO_FLOW_LABEL_OFF:
960 case IP6_AUTO_FLOW_LABEL_OPTIN:
961 default:
962 return 0;
963 case IP6_AUTO_FLOW_LABEL_OPTOUT:
964 case IP6_AUTO_FLOW_LABEL_FORCED:
965 return 1;
966 }
967}
a37934fc 968#else
a37934fc 969static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
42240901
TH		 970 __be32 flowlabel, bool autolabel,
971 struct flowi6 *fl6)
a37934fc
FF		 972{
973 return flowlabel;
974}
42240901
TH		 975static inline int ip6_default_np_autolabel(struct net *net)
976{
977 return 0;
978}
a37934fc
FF		 979#endif
980
918ee507
PM		 981#if IS_ENABLED(CONFIG_IPV6)
982static inline int ip6_multipath_hash_policy(const struct net *net)
983{
984 return net->ipv6.sysctl.multipath_hash_policy;
985}
ed13923f
IS		 986static inline u32 ip6_multipath_hash_fields(const struct net *net)
987{
988 return net->ipv6.sysctl.multipath_hash_fields;
989}
918ee507
PM		 990#else
991static inline int ip6_multipath_hash_policy(const struct net *net)
992{
993 return 0;
994}
ed13923f
IS		 995static inline u32 ip6_multipath_hash_fields(const struct net *net)
996{
997 return 0;
998}
918ee507 999#endif
cb1ce2ef 1000
3e4e4c1f
YH		 1001/*
1002 * Header manipulation
1003 */
1004static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
1005 __be32 flowlabel)
1006{
07f623d3 1007 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
3e4e4c1f
YH		 1008}
1009
6502ca52
YH		 1010static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
1011{
1012 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
1013}
1014
3308de2b
FF		 1015static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
1016{
1017 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
1018}
1019
d76ed22b
LR		 1020static inline u8 ip6_tclass(__be32 flowinfo)
1021{
1022 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
1023}
eaa93bf4 1024
a410a0cf
GN		 1025static inline dscp_t ip6_dscp(__be32 flowinfo)
1026{
1027 return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
1028}
1029
eaa93bf4
DB		 1030static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
1031{
1032 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
1033}
1034
fa1be7e0
MK		 1035static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
1036{
1037 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
1038}
1039
1da177e4
LT		 1040/*
1041 * Prototypes exported by ipv6
1042 */
1043
1044/*
1045 * rcv function (called from netdevice level)
1046 */
1047
5c3a0fd7
JP		 1048int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1049 struct packet_type *pt, struct net_device *orig_dev);
d8269e2c
EC		 1050void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1051 struct net_device *orig_dev);
1da177e4 1052
0c4b51f0 1053int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
b05e1066 1054
1da177e4
LT		 1055/*
1056 * upper-layer output functions
1057 */
1c1e9d2b 1058int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
4f6570d7 1059 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
5c3a0fd7
JP		 1060
1061int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1062
1063int ip6_append_data(struct sock *sk,
1064 int getfrag(void *from, char *to, int offset, int len,
1065 int odd, struct sk_buff *skb),
f93431c8 1066 void *from, size_t length, int transhdrlen,
26879da5 1067 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
5fdaa88d 1068 struct rt6_info *rt, unsigned int flags);
5c3a0fd7
JP		 1069
1070int ip6_push_pending_frames(struct sock *sk);
1071
1072void ip6_flush_pending_frames(struct sock *sk);
1073
6422398c
VY		 1074int ip6_send_skb(struct sk_buff *skb);
1075
1076struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1077 struct inet_cork_full *cork,
1078 struct inet6_cork *v6_cork);
1079struct sk_buff *ip6_make_skb(struct sock *sk,
1080 int getfrag(void *from, char *to, int offset,
1081 int len, int odd, struct sk_buff *skb),
f93431c8 1082 void *from, size_t length, int transhdrlen,
f37a4cc6 1083 struct ipcm6_cookie *ipc6,
26879da5 1084 struct rt6_info *rt, unsigned int flags,
5fdaa88d 1085 struct inet_cork_full *cork);
6422398c
VY		 1086
1087static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1088{
1089 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1090 &inet6_sk(sk)->cork);
1091}
1092
343d60aa
RP		 1093int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1094 struct flowi6 *fl6);
c4e85f73 1095struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
0e0d44ab 1096 const struct in6_addr *final_dst);
5c3a0fd7 1097struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
96818159
AK		 1098 const struct in6_addr *final_dst,
1099 bool connected);
571912c6
MV		 1100struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
1101 struct net_device *dev,
1102 struct net *net, struct socket *sock,
1103 struct in6_addr *saddr,
1104 const struct ip_tunnel_info *info,
1105 u8 protocol, bool use_cache);
5c3a0fd7
JP		 1106struct dst_entry *ip6_blackhole_route(struct net *net,
1107 struct dst_entry *orig_dst);
1da177e4
LT		 1108
1109/*
1110 * skb processing functions
1111 */
1112
ede2059d 1113int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
5c3a0fd7
JP		 1114int ip6_forward(struct sk_buff *skb);
1115int ip6_input(struct sk_buff *skb);
1116int ip6_mc_input(struct sk_buff *skb);
80bde363
PA		 1117void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1118 bool have_final);
1da177e4 1119
cf91a99d 1120int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
33224b16 1121int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
ef76bc23 1122
1da177e4
LT		 1123/*
1124 * Extension header (options) processing
1125 */
1126
5c3a0fd7 1127void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
613fa3ca
DL		 1128 u8 *proto, struct in6_addr **daddr_p,
1129 struct in6_addr *saddr);
5c3a0fd7
JP		 1130void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1131 u8 *proto);
1da177e4 1132
5c3a0fd7
JP		 1133int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1134 __be16 *frag_offp);
1da177e4 1135
5c3a0fd7 1136bool ipv6_ext_hdr(u8 nexthdr);
1da177e4 1137
f8f62675 1138enum {
9195bb8e
AA		 1139 IP6_FH_F_FRAG = (1 << 0),
1140 IP6_FH_F_AUTH = (1 << 1),
1141 IP6_FH_F_SKIP_RH = (1 << 2),
f8f62675
JG		 1142};
1143
1144/* find specified header and get offset to it */
5c3a0fd7
JP		 1145int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1146 unsigned short *fragoff, int *fragflg);
f8f62675 1147
0868383b 1148int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
c61a4043 1149
5c3a0fd7
JP		 1150struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1151 const struct ipv6_txoptions *opt,
1152 struct in6_addr *orig);
20c59de2 1153
1da177e4
LT		 1154/*
1155 * socket options (ipv6_sockglue.c)
1156 */
790eb673 1157DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1da177e4 1158
75b64b68
MKL		 1159int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1160 unsigned int optlen);
a7b75c5a
CH		 1161int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1162 unsigned int optlen);
38566ec0
MKL		 1163int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1164 sockptr_t optval, sockptr_t optlen);
5c3a0fd7
JP		 1165int ipv6_getsockopt(struct sock *sk, int level, int optname,
1166 char __user *optval, int __user *optlen);
5c3a0fd7 1167
0382a25a
GN		 1168int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1169 int addr_len);
5c3a0fd7 1170int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
82b276cd
HFS		 1171int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1172 int addr_len);
33c162a9 1173int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
e646b657 1174void ip6_datagram_release_cb(struct sock *sk);
5c3a0fd7 1175
85fbaa75
HFS		 1176int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1177 int *addr_len);
1178int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1179 int *addr_len);
5c3a0fd7
JP		 1180void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1181 u32 info, u8 *payload);
1182void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1183void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1184
21985f43 1185void inet6_cleanup_sock(struct sock *sk);
d38afeec 1186void inet6_sock_destruct(struct sock *sk);
5c3a0fd7
JP		 1187int inet6_release(struct socket *sock);
1188int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
9b2c45d4 1189int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
5c3a0fd7
JP		 1190 int peer);
1191int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
3986912f
CH		 1192int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1193 unsigned long arg);
5c3a0fd7
JP		 1194
1195int inet6_hash_connect(struct inet_timewait_death_row *death_row,
d8313f5c 1196 struct sock *sk);
e42f1ac6
FW		 1197int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1198int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1199 int flags);
d8313f5c 1200
1da177e4
LT		 1201/*
1202 * reassembly.c
1203 */
90ddc4f0
ED		 1204extern const struct proto_ops inet6_stream_ops;
1205extern const struct proto_ops inet6_dgram_ops;
77d4b1d3 1206extern const struct proto_ops inet6_sockraw_ops;
20380731 1207
14c85021
ACM		 1208struct group_source_req;
1209struct group_filter;
1210
5c3a0fd7
JP		 1211int ip6_mc_source(int add, int omode, struct sock *sk,
1212 struct group_source_req *pgsr);
d59eb177
AV		 1213int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1214 struct sockaddr_storage *list);
5c3a0fd7 1215int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
6dadbe4b 1216 sockptr_t optval, size_t ss_offset);
20380731
ACM		 1217
1218#ifdef CONFIG_PROC_FS
5c3a0fd7
JP		 1219int ac6_proc_init(struct net *net);
1220void ac6_proc_exit(struct net *net);
1221int raw6_proc_init(void);
1222void raw6_proc_exit(void);
1223int tcp6_proc_init(struct net *net);
1224void tcp6_proc_exit(struct net *net);
1225int udp6_proc_init(struct net *net);
1226void udp6_proc_exit(struct net *net);
1227int udplite6_proc_init(void);
1228void udplite6_proc_exit(void);
1229int ipv6_misc_proc_init(void);
1230void ipv6_misc_proc_exit(void);
1231int snmp6_register_dev(struct inet6_dev *idev);
1232int snmp6_unregister_dev(struct inet6_dev *idev);
20380731 1233
7f7d9a6b 1234#else
6ab57e7e
DL		 1235static inline int ac6_proc_init(struct net *net) { return 0; }
1236static inline void ac6_proc_exit(struct net *net) { }
1237static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1238static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
20380731 1239#endif
1da177e4 1240
20380731 1241#ifdef CONFIG_SYSCTL
5c3a0fd7
JP		 1242struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1243struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1244int ipv6_sysctl_register(void);
1245void ipv6_sysctl_unregister(void);
20380731 1246#endif
1da177e4 1247
46a4dee0
MC		 1248int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1249 const struct in6_addr *addr);
c7ea20c9
HL		 1250int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1251 const struct in6_addr *addr, unsigned int mode);
46a4dee0
MC		 1252int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1253 const struct in6_addr *addr);
9b115749
CH		 1254
1255static inline int ip6_sock_set_v6only(struct sock *sk)
1256{
1257 if (inet_sk(sk)->inet_num)
1258 return -EINVAL;
1259 lock_sock(sk);
1260 sk->sk_ipv6only = true;
1261 release_sock(sk);
1262 return 0;
1263}
1264
fce93494
CH		 1265static inline void ip6_sock_set_recverr(struct sock *sk)
1266{
1267 lock_sock(sk);
1268 inet6_sk(sk)->recverr = true;
1269 release_sock(sk);
1270}
1271
18d5ad62
CH		 1272static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1273{
1274 unsigned int pref = 0;
1275 unsigned int prefmask = ~0;
1276
1277 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1278 switch (val & (IPV6_PREFER_SRC_PUBLIC |
1279 IPV6_PREFER_SRC_TMP |
1280 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1281 case IPV6_PREFER_SRC_PUBLIC:
1282 pref |= IPV6_PREFER_SRC_PUBLIC;
1283 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1284 IPV6_PREFER_SRC_TMP);
1285 break;
1286 case IPV6_PREFER_SRC_TMP:
1287 pref |= IPV6_PREFER_SRC_TMP;
1288 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1289 IPV6_PREFER_SRC_TMP);
1290 break;
1291 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1292 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1293 IPV6_PREFER_SRC_TMP);
1294 break;
1295 case 0:
1296 break;
1297 default:
1298 return -EINVAL;
1299 }
1300
1301 /* check HOME/COA conflicts */
1302 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1303 case IPV6_PREFER_SRC_HOME:
1304 prefmask &= ~IPV6_PREFER_SRC_COA;
1305 break;
1306 case IPV6_PREFER_SRC_COA:
1307 pref |= IPV6_PREFER_SRC_COA;
1308 break;
1309 case 0:
1310 break;
1311 default:
1312 return -EINVAL;
1313 }
1314
1315 /* check CGA/NONCGA conflicts */
1316 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1317 case IPV6_PREFER_SRC_CGA:
1318 case IPV6_PREFER_SRC_NONCGA:
1319 case 0:
1320 break;
1321 default:
1322 return -EINVAL;
1323 }
1324
1325 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1326 return 0;
1327}
1328
1329static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1330{
1331 int ret;
1332
1333 lock_sock(sk);
1334 ret = __ip6_sock_set_addr_preferences(sk, val);
1335 release_sock(sk);
1336 return ret;
1337}
1338
7d7207c2
CH		 1339static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1340{
1341 lock_sock(sk);
1342 inet6_sk(sk)->rxopt.bits.rxinfo = true;
1343 release_sock(sk);
1344}
1345
20380731 1346#endif /* _NET_IPV6_H */
Linux 6.x block layer and io_uring tree(s)