1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 */
8
9#ifndef _NET_IPV6_H
10#define _NET_IPV6_H
11
12#include <linux/ipv6.h>
13#include <linux/hardirq.h>
14#include <linux/jhash.h>
15#include <linux/refcount.h>
16#include <linux/jump_label_ratelimit.h>
17#include <net/if_inet6.h>
18#include <net/flow.h>
19#include <net/flow_dissector.h>
20#include <net/inet_dscp.h>
21#include <net/snmp.h>
22#include <net/netns/hash.h>
23
24struct ip_tunnel_info;
25
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. */
35#define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */
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. */
41#define NEXTHDR_GRE 47 /* GRE header. */
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. */
47#define NEXTHDR_SCTP 132 /* SCTP message. */
48#define NEXTHDR_MOBILITY 135 /* Mobility header. */
49
50#define NEXTHDR_MAX 255
51
52#define IPV6_DEFAULT_HOPLIMIT 64
53#define IPV6_DEFAULT_MCASTHOPS 1
54
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
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
108#define IPV6_ADDR_UNICAST 0x0001U
109#define IPV6_ADDR_MULTICAST 0x0002U
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
120
121/*
122 * Addr scopes
123 */
124#define IPV6_ADDR_MC_SCOPE(a) \
125 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
126#define __IPV6_ADDR_SCOPE_INVALID -1
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
133/*
134 * Addr flags
135 */
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)
142
143/*
144 * fragmentation header
145 */
146
147struct frag_hdr {
148 __u8 nexthdr;
149 __u8 reserved;
150 __be16 frag_off;
151 __be32 identification;
152};
153
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
165#define IP6_MF 0x0001
166#define IP6_OFFSET 0xFFF8
167
168struct ip6_fraglist_iter {
169 struct ipv6hdr *tmp_hdr;
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
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
211#define IP6_REPLY_MARK(net, mark) \
212 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
213
214#include <net/sock.h>
215
216/* sysctls */
217extern int sysctl_mld_max_msf;
218extern int sysctl_mld_qrv;
219
220#define _DEVINC(net, statname, mod, idev, field) \
221({ \
222 struct inet6_dev *_idev = (idev); \
223 if (likely(_idev != NULL)) \
224 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
225 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
226})
227
228/* per device counters are atomic_long_t */
229#define _DEVINCATOMIC(net, statname, mod, idev, field) \
230({ \
231 struct inet6_dev *_idev = (idev); \
232 if (likely(_idev != NULL)) \
233 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
234 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
235})
236
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
246#define _DEVADD(net, statname, mod, idev, field, val) \
247({ \
248 struct inet6_dev *_idev = (idev); \
249 if (likely(_idev != NULL)) \
250 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
251 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
252})
253
254#define _DEVUPD(net, statname, mod, idev, field, val) \
255({ \
256 struct inet6_dev *_idev = (idev); \
257 if (likely(_idev != NULL)) \
258 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
259 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
260})
261
262/* MIBs */
263
264#define IP6_INC_STATS(net, idev,field) \
265 _DEVINC(net, ipv6, , idev, field)
266#define __IP6_INC_STATS(net, idev,field) \
267 _DEVINC(net, ipv6, __, idev, field)
268#define IP6_ADD_STATS(net, idev,field,val) \
269 _DEVADD(net, ipv6, , idev, field, val)
270#define __IP6_ADD_STATS(net, idev,field,val) \
271 _DEVADD(net, ipv6, __, idev, field, val)
272#define IP6_UPD_PO_STATS(net, idev,field,val) \
273 _DEVUPD(net, ipv6, , idev, field, val)
274#define __IP6_UPD_PO_STATS(net, idev,field,val) \
275 _DEVUPD(net, ipv6, __, idev, field, val)
276#define ICMP6_INC_STATS(net, idev, field) \
277 _DEVINCATOMIC(net, icmpv6, , idev, field)
278#define __ICMP6_INC_STATS(net, idev, field) \
279 _DEVINCATOMIC(net, icmpv6, __, idev, field)
280
281#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
282 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
283#define ICMP6MSGIN_INC_STATS(net, idev, field) \
284 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
285
286struct ip6_ra_chain {
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
301struct ipv6_txoptions {
302 refcount_t refcnt;
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 */
314 struct ipv6_opt_hdr *dst1opt;
315 struct rcu_head rcu;
316 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
317};
318
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
326struct ip6_flowlabel {
327 struct ip6_flowlabel __rcu *next;
328 __be32 label;
329 atomic_t users;
330 struct in6_addr dst;
331 struct ipv6_txoptions *opt;
332 unsigned long linger;
333 struct rcu_head rcu;
334 u8 share;
335 union {
336 struct pid *pid;
337 kuid_t uid;
338 } owner;
339 unsigned long lastuse;
340 unsigned long expires;
341 struct net *fl_net;
342};
343
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
348#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
349#define IPV6_TCLASS_SHIFT 20
350
351struct ipv6_fl_socklist {
352 struct ipv6_fl_socklist __rcu *next;
353 struct ip6_flowlabel *fl;
354 struct rcu_head rcu;
355};
356
357struct ipcm6_cookie {
358 struct sockcm_cookie sockc;
359 __s16 hlimit;
360 __s16 tclass;
361 __u16 gso_size;
362 __s8 dontfrag;
363 struct ipv6_txoptions *opt;
364};
365
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 sock *sk)
377{
378 *ipc6 = (struct ipcm6_cookie) {
379 .hlimit = -1,
380 .tclass = inet6_sk(sk: sk)->tclass,
381 .dontfrag = inet6_test_bit(DONTFRAG, sk),
382 };
383}
384
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);
391 if (opt) {
392 if (!refcount_inc_not_zero(r: &opt->refcnt))
393 opt = NULL;
394 else
395 opt = rcu_pointer_handoff(opt);
396 }
397 rcu_read_unlock();
398 return opt;
399}
400
401static inline void txopt_put(struct ipv6_txoptions *opt)
402{
403 if (opt && refcount_dec_and_test(r: &opt->refcnt))
404 kfree_rcu(opt, rcu);
405}
406
407#if IS_ENABLED(CONFIG_IPV6)
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{
414 if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
415 READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
416 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(error: -ENOENT);
417
418 return NULL;
419}
420#endif
421
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);
426int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
427int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
428 int flags);
429int ip6_flowlabel_init(void);
430void ip6_flowlabel_cleanup(void);
431bool ip6_autoflowlabel(struct net *net, const struct sock *sk);
432
433static inline void fl6_sock_release(struct ip6_flowlabel *fl)
434{
435 if (fl)
436 atomic_dec(v: &fl->users);
437}
438
439enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type,
440 u8 code, __be32 info);
441
442void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
443 struct icmp6hdr *thdr, int len);
444
445int ip6_ra_control(struct sock *sk, int sel);
446
447int ipv6_parse_hopopts(struct sk_buff *skb);
448
449struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
450 struct ipv6_txoptions *opt);
451struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
452 struct ipv6_txoptions *opt,
453 int newtype,
454 struct ipv6_opt_hdr *newopt);
455struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
456 struct ipv6_txoptions *opt);
457
458static inline struct ipv6_txoptions *
459ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
460{
461 if (!opt)
462 return NULL;
463 return __ipv6_fixup_options(opt_space, opt);
464}
465
466bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
467 const struct inet6_skb_parm *opt);
468struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
469 struct ipv6_txoptions *opt);
470
471/* This helper is specialized for BIG TCP needs.
472 * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header.
473 * It assumes headers are already in skb->head.
474 * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there.
475 */
476static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb)
477{
478 const struct hop_jumbo_hdr *jhdr;
479 const struct ipv6hdr *nhdr;
480
481 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))
482 return 0;
483
484 if (skb->protocol != htons(ETH_P_IPV6))
485 return 0;
486
487 if (skb_network_offset(skb) +
488 sizeof(struct ipv6hdr) +
489 sizeof(struct hop_jumbo_hdr) > skb_headlen(skb))
490 return 0;
491
492 nhdr = ipv6_hdr(skb);
493
494 if (nhdr->nexthdr != NEXTHDR_HOP)
495 return 0;
496
497 jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1);
498 if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 ||
499 jhdr->nexthdr != IPPROTO_TCP)
500 return 0;
501 return jhdr->nexthdr;
502}
503
504/* Return 0 if HBH header is successfully removed
505 * Or if HBH removal is unnecessary (packet is not big TCP)
506 * Return error to indicate dropping the packet
507 */
508static inline int ipv6_hopopt_jumbo_remove(struct sk_buff *skb)
509{
510 const int hophdr_len = sizeof(struct hop_jumbo_hdr);
511 int nexthdr = ipv6_has_hopopt_jumbo(skb);
512 struct ipv6hdr *h6;
513
514 if (!nexthdr)
515 return 0;
516
517 if (skb_cow_head(skb, headroom: 0))
518 return -1;
519
520 /* Remove the HBH header.
521 * Layout: [Ethernet header][IPv6 header][HBH][L4 Header]
522 */
523 memmove(skb_mac_header(skb) + hophdr_len, skb_mac_header(skb),
524 skb_network_header(skb) - skb_mac_header(skb) +
525 sizeof(struct ipv6hdr));
526
527 __skb_pull(skb, len: hophdr_len);
528 skb->network_header += hophdr_len;
529 skb->mac_header += hophdr_len;
530
531 h6 = ipv6_hdr(skb);
532 h6->nexthdr = nexthdr;
533
534 return 0;
535}
536
537static inline bool ipv6_accept_ra(struct inet6_dev *idev)
538{
539 /* If forwarding is enabled, RA are not accepted unless the special
540 * hybrid mode (accept_ra=2) is enabled.
541 */
542 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
543 idev->cnf.accept_ra;
544}
545
546#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
547#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
548#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
549
550int __ipv6_addr_type(const struct in6_addr *addr);
551static inline int ipv6_addr_type(const struct in6_addr *addr)
552{
553 return __ipv6_addr_type(addr) & 0xffff;
554}
555
556static inline int ipv6_addr_scope(const struct in6_addr *addr)
557{
558 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
559}
560
561static inline int __ipv6_addr_src_scope(int type)
562{
563 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
564}
565
566static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
567{
568 return __ipv6_addr_src_scope(type: __ipv6_addr_type(addr));
569}
570
571static inline bool __ipv6_addr_needs_scope_id(int type)
572{
573 return type & IPV6_ADDR_LINKLOCAL ||
574 (type & IPV6_ADDR_MULTICAST &&
575 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
576}
577
578static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
579{
580 return __ipv6_addr_needs_scope_id(type: __ipv6_addr_type(addr)) ? iface : 0;
581}
582
583static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
584{
585 return memcmp(p: a1, q: a2, size: sizeof(struct in6_addr));
586}
587
588static inline bool
589ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
590 const struct in6_addr *a2)
591{
592#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
593 const unsigned long *ul1 = (const unsigned long *)a1;
594 const unsigned long *ulm = (const unsigned long *)m;
595 const unsigned long *ul2 = (const unsigned long *)a2;
596
597 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
598 ((ul1[1] ^ ul2[1]) & ulm[1]));
599#else
600 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
601 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
602 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
603 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
604#endif
605}
606
607static inline void ipv6_addr_prefix(struct in6_addr *pfx,
608 const struct in6_addr *addr,
609 int plen)
610{
611 /* caller must guarantee 0 <= plen <= 128 */
612 int o = plen >> 3,
613 b = plen & 0x7;
614
615 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
616 memcpy(pfx->s6_addr, addr, o);
617 if (b != 0)
618 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
619}
620
621static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
622 const struct in6_addr *pfx,
623 int plen)
624{
625 /* caller must guarantee 0 <= plen <= 128 */
626 int o = plen >> 3,
627 b = plen & 0x7;
628
629 memcpy(addr->s6_addr, pfx, o);
630 if (b != 0) {
631 addr->s6_addr[o] &= ~(0xff00 >> b);
632 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
633 }
634}
635
636static inline void __ipv6_addr_set_half(__be32 *addr,
637 __be32 wh, __be32 wl)
638{
639#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
640#if defined(__BIG_ENDIAN)
641 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
642 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
643 return;
644 }
645#elif defined(__LITTLE_ENDIAN)
646 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
647 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
648 return;
649 }
650#endif
651#endif
652 addr[0] = wh;
653 addr[1] = wl;
654}
655
656static inline void ipv6_addr_set(struct in6_addr *addr,
657 __be32 w1, __be32 w2,
658 __be32 w3, __be32 w4)
659{
660 __ipv6_addr_set_half(addr: &addr->s6_addr32[0], wh: w1, wl: w2);
661 __ipv6_addr_set_half(addr: &addr->s6_addr32[2], wh: w3, wl: w4);
662}
663
664static inline bool ipv6_addr_equal(const struct in6_addr *a1,
665 const struct in6_addr *a2)
666{
667#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
668 const unsigned long *ul1 = (const unsigned long *)a1;
669 const unsigned long *ul2 = (const unsigned long *)a2;
670
671 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
672#else
673 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
674 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
675 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
676 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
677#endif
678}
679
680#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
681static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
682 const __be64 *a2,
683 unsigned int len)
684{
685 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
686 return false;
687 return true;
688}
689
690static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
691 const struct in6_addr *addr2,
692 unsigned int prefixlen)
693{
694 const __be64 *a1 = (const __be64 *)addr1;
695 const __be64 *a2 = (const __be64 *)addr2;
696
697 if (prefixlen >= 64) {
698 if (a1[0] ^ a2[0])
699 return false;
700 return __ipv6_prefix_equal64_half(a1: a1 + 1, a2: a2 + 1, len: prefixlen - 64);
701 }
702 return __ipv6_prefix_equal64_half(a1, a2, len: prefixlen);
703}
704#else
705static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
706 const struct in6_addr *addr2,
707 unsigned int prefixlen)
708{
709 const __be32 *a1 = addr1->s6_addr32;
710 const __be32 *a2 = addr2->s6_addr32;
711 unsigned int pdw, pbi;
712
713 /* check complete u32 in prefix */
714 pdw = prefixlen >> 5;
715 if (pdw && memcmp(a1, a2, pdw << 2))
716 return false;
717
718 /* check incomplete u32 in prefix */
719 pbi = prefixlen & 0x1f;
720 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
721 return false;
722
723 return true;
724}
725#endif
726
727static inline bool ipv6_addr_any(const struct in6_addr *a)
728{
729#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
730 const unsigned long *ul = (const unsigned long *)a;
731
732 return (ul[0] | ul[1]) == 0UL;
733#else
734 return (a->s6_addr32[0] | a->s6_addr32[1] |
735 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
736#endif
737}
738
739static inline u32 ipv6_addr_hash(const struct in6_addr *a)
740{
741#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
742 const unsigned long *ul = (const unsigned long *)a;
743 unsigned long x = ul[0] ^ ul[1];
744
745 return (u32)(x ^ (x >> 32));
746#else
747 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
748 a->s6_addr32[2] ^ a->s6_addr32[3]);
749#endif
750}
751
752/* more secured version of ipv6_addr_hash() */
753static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
754{
755 return jhash2(k: (__force const u32 *)a->s6_addr32,
756 ARRAY_SIZE(a->s6_addr32), initval);
757}
758
759static inline bool ipv6_addr_loopback(const struct in6_addr *a)
760{
761#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
762 const __be64 *be = (const __be64 *)a;
763
764 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
765#else
766 return (a->s6_addr32[0] | a->s6_addr32[1] |
767 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
768#endif
769}
770
771/*
772 * Note that we must __force cast these to unsigned long to make sparse happy,
773 * since all of the endian-annotated types are fixed size regardless of arch.
774 */
775static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
776{
777 return (
778#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
779 *(unsigned long *)a |
780#else
781 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
782#endif
783 (__force unsigned long)(a->s6_addr32[2] ^
784 cpu_to_be32(0x0000ffff))) == 0UL;
785}
786
787static inline bool ipv6_addr_v4mapped_any(const struct in6_addr *a)
788{
789 return ipv6_addr_v4mapped(a) && ipv4_is_zeronet(addr: a->s6_addr32[3]);
790}
791
792static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
793{
794 return ipv6_addr_v4mapped(a) && ipv4_is_loopback(addr: a->s6_addr32[3]);
795}
796
797static inline u32 ipv6_portaddr_hash(const struct net *net,
798 const struct in6_addr *addr6,
799 unsigned int port)
800{
801 unsigned int hash, mix = net_hash_mix(net);
802
803 if (ipv6_addr_any(a: addr6))
804 hash = jhash_1word(a: 0, initval: mix);
805 else if (ipv6_addr_v4mapped(a: addr6))
806 hash = jhash_1word(a: (__force u32)addr6->s6_addr32[3], initval: mix);
807 else
808 hash = jhash2(k: (__force u32 *)addr6->s6_addr32, length: 4, initval: mix);
809
810 return hash ^ port;
811}
812
813/*
814 * Check for a RFC 4843 ORCHID address
815 * (Overlay Routable Cryptographic Hash Identifiers)
816 */
817static inline bool ipv6_addr_orchid(const struct in6_addr *a)
818{
819 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
820}
821
822static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
823{
824 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
825}
826
827static inline void ipv6_addr_set_v4mapped(const __be32 addr,
828 struct in6_addr *v4mapped)
829{
830 ipv6_addr_set(addr: v4mapped,
831 w1: 0, w2: 0,
832 htonl(0x0000FFFF),
833 w4: addr);
834}
835
836/*
837 * find the first different bit between two addresses
838 * length of address must be a multiple of 32bits
839 */
840static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
841{
842 const __be32 *a1 = token1, *a2 = token2;
843 int i;
844
845 addrlen >>= 2;
846
847 for (i = 0; i < addrlen; i++) {
848 __be32 xb = a1[i] ^ a2[i];
849 if (xb)
850 return i * 32 + 31 - __fls(ntohl(xb));
851 }
852
853 /*
854 * we should *never* get to this point since that
855 * would mean the addrs are equal
856 *
857 * However, we do get to it 8) And exacly, when
858 * addresses are equal 8)
859 *
860 * ip route add 1111::/128 via ...
861 * ip route add 1111::/64 via ...
862 * and we are here.
863 *
864 * Ideally, this function should stop comparison
865 * at prefix length. It does not, but it is still OK,
866 * if returned value is greater than prefix length.
867 * --ANK (980803)
868 */
869 return addrlen << 5;
870}
871
872#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
873static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
874{
875 const __be64 *a1 = token1, *a2 = token2;
876 int i;
877
878 addrlen >>= 3;
879
880 for (i = 0; i < addrlen; i++) {
881 __be64 xb = a1[i] ^ a2[i];
882 if (xb)
883 return i * 64 + 63 - __fls(be64_to_cpu(xb));
884 }
885
886 return addrlen << 6;
887}
888#endif
889
890static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
891{
892#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
893 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
894 return __ipv6_addr_diff64(token1, token2, addrlen);
895#endif
896 return __ipv6_addr_diff32(token1, token2, addrlen);
897}
898
899static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
900{
901 return __ipv6_addr_diff(token1: a1, token2: a2, addrlen: sizeof(struct in6_addr));
902}
903
904__be32 ipv6_select_ident(struct net *net,
905 const struct in6_addr *daddr,
906 const struct in6_addr *saddr);
907__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
908
909int ip6_dst_hoplimit(struct dst_entry *dst);
910
911static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
912 struct dst_entry *dst)
913{
914 int hlimit;
915
916 if (ipv6_addr_is_multicast(addr: &fl6->daddr))
917 hlimit = READ_ONCE(np->mcast_hops);
918 else
919 hlimit = READ_ONCE(np->hop_limit);
920 if (hlimit < 0)
921 hlimit = ip6_dst_hoplimit(dst);
922 return hlimit;
923}
924
925/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
926 * Equivalent to : flow->v6addrs.src = iph->saddr;
927 * flow->v6addrs.dst = iph->daddr;
928 */
929static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
930 const struct ipv6hdr *iph)
931{
932 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
933 offsetof(typeof(flow->addrs), v6addrs.src) +
934 sizeof(flow->addrs.v6addrs.src));
935 memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs));
936 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
937}
938
939#if IS_ENABLED(CONFIG_IPV6)
940
941static inline bool ipv6_can_nonlocal_bind(struct net *net,
942 struct inet_sock *inet)
943{
944 return net->ipv6.sysctl.ip_nonlocal_bind ||
945 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) ||
946 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags);
947}
948
949/* Sysctl settings for net ipv6.auto_flowlabels */
950#define IP6_AUTO_FLOW_LABEL_OFF 0
951#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
952#define IP6_AUTO_FLOW_LABEL_OPTIN 2
953#define IP6_AUTO_FLOW_LABEL_FORCED 3
954
955#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
956
957#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
958
959static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
960 __be32 flowlabel, bool autolabel,
961 struct flowi6 *fl6)
962{
963 u32 hash;
964
965 /* @flowlabel may include more than a flow label, eg, the traffic class.
966 * Here we want only the flow label value.
967 */
968 flowlabel &= IPV6_FLOWLABEL_MASK;
969
970 if (flowlabel ||
971 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
972 (!autolabel &&
973 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
974 return flowlabel;
975
976 hash = skb_get_hash_flowi6(skb, fl6);
977
978 /* Since this is being sent on the wire obfuscate hash a bit
979 * to minimize possbility that any useful information to an
980 * attacker is leaked. Only lower 20 bits are relevant.
981 */
982 hash = rol32(word: hash, shift: 16);
983
984 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
985
986 if (net->ipv6.sysctl.flowlabel_state_ranges)
987 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
988
989 return flowlabel;
990}
991
992static inline int ip6_default_np_autolabel(struct net *net)
993{
994 switch (net->ipv6.sysctl.auto_flowlabels) {
995 case IP6_AUTO_FLOW_LABEL_OFF:
996 case IP6_AUTO_FLOW_LABEL_OPTIN:
997 default:
998 return 0;
999 case IP6_AUTO_FLOW_LABEL_OPTOUT:
1000 case IP6_AUTO_FLOW_LABEL_FORCED:
1001 return 1;
1002 }
1003}
1004#else
1005static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
1006 __be32 flowlabel, bool autolabel,
1007 struct flowi6 *fl6)
1008{
1009 return flowlabel;
1010}
1011static inline int ip6_default_np_autolabel(struct net *net)
1012{
1013 return 0;
1014}
1015#endif
1016
1017#if IS_ENABLED(CONFIG_IPV6)
1018static inline int ip6_multipath_hash_policy(const struct net *net)
1019{
1020 return net->ipv6.sysctl.multipath_hash_policy;
1021}
1022static inline u32 ip6_multipath_hash_fields(const struct net *net)
1023{
1024 return net->ipv6.sysctl.multipath_hash_fields;
1025}
1026#else
1027static inline int ip6_multipath_hash_policy(const struct net *net)
1028{
1029 return 0;
1030}
1031static inline u32 ip6_multipath_hash_fields(const struct net *net)
1032{
1033 return 0;
1034}
1035#endif
1036
1037/*
1038 * Header manipulation
1039 */
1040static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
1041 __be32 flowlabel)
1042{
1043 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
1044}
1045
1046static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
1047{
1048 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
1049}
1050
1051static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
1052{
1053 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
1054}
1055
1056static inline u8 ip6_tclass(__be32 flowinfo)
1057{
1058 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
1059}
1060
1061static inline dscp_t ip6_dscp(__be32 flowinfo)
1062{
1063 return inet_dsfield_to_dscp(dsfield: ip6_tclass(flowinfo));
1064}
1065
1066static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
1067{
1068 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
1069}
1070
1071static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
1072{
1073 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
1074}
1075
1076/*
1077 * Prototypes exported by ipv6
1078 */
1079
1080/*
1081 * rcv function (called from netdevice level)
1082 */
1083
1084int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1085 struct packet_type *pt, struct net_device *orig_dev);
1086void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1087 struct net_device *orig_dev);
1088
1089int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1090
1091/*
1092 * upper-layer output functions
1093 */
1094int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1095 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
1096
1097int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1098
1099int ip6_append_data(struct sock *sk,
1100 int getfrag(void *from, char *to, int offset, int len,
1101 int odd, struct sk_buff *skb),
1102 void *from, size_t length, int transhdrlen,
1103 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1104 struct rt6_info *rt, unsigned int flags);
1105
1106int ip6_push_pending_frames(struct sock *sk);
1107
1108void ip6_flush_pending_frames(struct sock *sk);
1109
1110int ip6_send_skb(struct sk_buff *skb);
1111
1112struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1113 struct inet_cork_full *cork,
1114 struct inet6_cork *v6_cork);
1115struct sk_buff *ip6_make_skb(struct sock *sk,
1116 int getfrag(void *from, char *to, int offset,
1117 int len, int odd, struct sk_buff *skb),
1118 void *from, size_t length, int transhdrlen,
1119 struct ipcm6_cookie *ipc6,
1120 struct rt6_info *rt, unsigned int flags,
1121 struct inet_cork_full *cork);
1122
1123static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1124{
1125 return __ip6_make_skb(sk, queue: &sk->sk_write_queue, cork: &inet_sk(sk)->cork,
1126 v6_cork: &inet6_sk(sk: sk)->cork);
1127}
1128
1129int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1130 struct flowi6 *fl6);
1131struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1132 const struct in6_addr *final_dst);
1133struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1134 const struct in6_addr *final_dst,
1135 bool connected);
1136struct dst_entry *ip6_blackhole_route(struct net *net,
1137 struct dst_entry *orig_dst);
1138
1139/*
1140 * skb processing functions
1141 */
1142
1143int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1144int ip6_forward(struct sk_buff *skb);
1145int ip6_input(struct sk_buff *skb);
1146int ip6_mc_input(struct sk_buff *skb);
1147void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1148 bool have_final);
1149
1150int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1151int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1152
1153/*
1154 * Extension header (options) processing
1155 */
1156
1157void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1158 u8 *proto, struct in6_addr **daddr_p,
1159 struct in6_addr *saddr);
1160void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1161 u8 *proto);
1162
1163int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1164 __be16 *frag_offp);
1165
1166bool ipv6_ext_hdr(u8 nexthdr);
1167
1168enum {
1169 IP6_FH_F_FRAG = (1 << 0),
1170 IP6_FH_F_AUTH = (1 << 1),
1171 IP6_FH_F_SKIP_RH = (1 << 2),
1172};
1173
1174/* find specified header and get offset to it */
1175int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1176 unsigned short *fragoff, int *fragflg);
1177
1178int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1179
1180struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1181 const struct ipv6_txoptions *opt,
1182 struct in6_addr *orig);
1183
1184/*
1185 * socket options (ipv6_sockglue.c)
1186 */
1187DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1188
1189int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1190 unsigned int optlen);
1191int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1192 unsigned int optlen);
1193int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1194 sockptr_t optval, sockptr_t optlen);
1195int ipv6_getsockopt(struct sock *sk, int level, int optname,
1196 char __user *optval, int __user *optlen);
1197
1198int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1199 int addr_len);
1200int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1201int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1202 int addr_len);
1203int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1204void ip6_datagram_release_cb(struct sock *sk);
1205
1206int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1207 int *addr_len);
1208int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1209 int *addr_len);
1210void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1211 u32 info, u8 *payload);
1212void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1213void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1214
1215void inet6_cleanup_sock(struct sock *sk);
1216void inet6_sock_destruct(struct sock *sk);
1217int inet6_release(struct socket *sock);
1218int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1219int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len);
1220int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1221 int peer);
1222int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1223int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1224 unsigned long arg);
1225
1226int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1227 struct sock *sk);
1228int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1229int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1230 int flags);
1231
1232/*
1233 * reassembly.c
1234 */
1235extern const struct proto_ops inet6_stream_ops;
1236extern const struct proto_ops inet6_dgram_ops;
1237extern const struct proto_ops inet6_sockraw_ops;
1238
1239struct group_source_req;
1240struct group_filter;
1241
1242int ip6_mc_source(int add, int omode, struct sock *sk,
1243 struct group_source_req *pgsr);
1244int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1245 struct sockaddr_storage *list);
1246int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1247 sockptr_t optval, size_t ss_offset);
1248
1249#ifdef CONFIG_PROC_FS
1250int ac6_proc_init(struct net *net);
1251void ac6_proc_exit(struct net *net);
1252int raw6_proc_init(void);
1253void raw6_proc_exit(void);
1254int tcp6_proc_init(struct net *net);
1255void tcp6_proc_exit(struct net *net);
1256int udp6_proc_init(struct net *net);
1257void udp6_proc_exit(struct net *net);
1258int udplite6_proc_init(void);
1259void udplite6_proc_exit(void);
1260int ipv6_misc_proc_init(void);
1261void ipv6_misc_proc_exit(void);
1262int snmp6_register_dev(struct inet6_dev *idev);
1263int snmp6_unregister_dev(struct inet6_dev *idev);
1264
1265#else
1266static inline int ac6_proc_init(struct net *net) { return 0; }
1267static inline void ac6_proc_exit(struct net *net) { }
1268static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1269static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1270#endif
1271
1272#ifdef CONFIG_SYSCTL
1273struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1274size_t ipv6_icmp_sysctl_table_size(void);
1275struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1276size_t ipv6_route_sysctl_table_size(struct net *net);
1277int ipv6_sysctl_register(void);
1278void ipv6_sysctl_unregister(void);
1279#endif
1280
1281int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1282 const struct in6_addr *addr);
1283int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1284 const struct in6_addr *addr, unsigned int mode);
1285int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1286 const struct in6_addr *addr);
1287
1288static inline int ip6_sock_set_v6only(struct sock *sk)
1289{
1290 if (inet_sk(sk)->inet_num)
1291 return -EINVAL;
1292 lock_sock(sk);
1293 sk->sk_ipv6only = true;
1294 release_sock(sk);
1295 return 0;
1296}
1297
1298static inline void ip6_sock_set_recverr(struct sock *sk)
1299{
1300 inet6_set_bit(RECVERR6, sk);
1301}
1302
1303#define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \
1304 IPV6_PREFER_SRC_COA)
1305
1306static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val)
1307{
1308 unsigned int prefmask = ~IPV6_PREFER_SRC_MASK;
1309 unsigned int pref = 0;
1310
1311 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1312 switch (val & (IPV6_PREFER_SRC_PUBLIC |
1313 IPV6_PREFER_SRC_TMP |
1314 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1315 case IPV6_PREFER_SRC_PUBLIC:
1316 pref |= IPV6_PREFER_SRC_PUBLIC;
1317 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1318 IPV6_PREFER_SRC_TMP);
1319 break;
1320 case IPV6_PREFER_SRC_TMP:
1321 pref |= IPV6_PREFER_SRC_TMP;
1322 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1323 IPV6_PREFER_SRC_TMP);
1324 break;
1325 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1326 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1327 IPV6_PREFER_SRC_TMP);
1328 break;
1329 case 0:
1330 break;
1331 default:
1332 return -EINVAL;
1333 }
1334
1335 /* check HOME/COA conflicts */
1336 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1337 case IPV6_PREFER_SRC_HOME:
1338 prefmask &= ~IPV6_PREFER_SRC_COA;
1339 break;
1340 case IPV6_PREFER_SRC_COA:
1341 pref |= IPV6_PREFER_SRC_COA;
1342 break;
1343 case 0:
1344 break;
1345 default:
1346 return -EINVAL;
1347 }
1348
1349 /* check CGA/NONCGA conflicts */
1350 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1351 case IPV6_PREFER_SRC_CGA:
1352 case IPV6_PREFER_SRC_NONCGA:
1353 case 0:
1354 break;
1355 default:
1356 return -EINVAL;
1357 }
1358
1359 WRITE_ONCE(inet6_sk(sk)->srcprefs,
1360 (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref);
1361 return 0;
1362}
1363
1364static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1365{
1366 lock_sock(sk);
1367 inet6_sk(sk: sk)->rxopt.bits.rxinfo = true;
1368 release_sock(sk);
1369}
1370
1371#endif /* _NET_IPV6_H */
1372

source code of linux/include/net/ipv6.h