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 ipv6_pinfo *np)
377{
378 *ipc6 = (struct ipcm6_cookie) {
379 .hlimit = -1,
380 .tclass = np->tclass,
381 .dontfrag = np->dontfrag,
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(&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(&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(-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 ipv6_pinfo *np);
432
433static inline void fl6_sock_release(struct ip6_flowlabel *fl)
434{
435 if (fl)
436 atomic_dec(&fl->users);
437}
438
439void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
440
441void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
442 struct icmp6hdr *thdr, int len);
443
444int ip6_ra_control(struct sock *sk, int sel);
445
446int ipv6_parse_hopopts(struct sk_buff *skb);
447
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,
453 struct ipv6_opt_hdr *newopt);
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}
464
465bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
466 const struct inet6_skb_parm *opt);
467struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
468 struct ipv6_txoptions *opt);
469
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
480 if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))
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
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
512#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
513#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
514#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
515
516int __ipv6_addr_type(const struct in6_addr *addr);
517static inline int ipv6_addr_type(const struct in6_addr *addr)
518{
519 return __ipv6_addr_type(addr) & 0xffff;
520}
521
522static inline int ipv6_addr_scope(const struct in6_addr *addr)
523{
524 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
525}
526
527static inline int __ipv6_addr_src_scope(int type)
528{
529 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
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));
535}
536
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
549static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
550{
551 return memcmp(a1, a2, sizeof(struct in6_addr));
552}
553
554static inline bool
555ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
556 const struct in6_addr *a2)
557{
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
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]));
570#endif
571}
572
573static inline void ipv6_addr_prefix(struct in6_addr *pfx,
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
581 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
582 memcpy(pfx->s6_addr, addr, o);
583 if (b != 0)
584 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
585}
586
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
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
622static inline void ipv6_addr_set(struct in6_addr *addr,
623 __be32 w1, __be32 w2,
624 __be32 w3, __be32 w4)
625{
626 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
627 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
628}
629
630static inline bool ipv6_addr_equal(const struct in6_addr *a1,
631 const struct in6_addr *a2)
632{
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
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;
643#endif
644}
645
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{
651 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
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
671static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
672 const struct in6_addr *addr2,
673 unsigned int prefixlen)
674{
675 const __be32 *a1 = addr1->s6_addr32;
676 const __be32 *a2 = addr2->s6_addr32;
677 unsigned int pdw, pbi;
678
679 /* check complete u32 in prefix */
680 pdw = prefixlen >> 5;
681 if (pdw && memcmp(a1, a2, pdw << 2))
682 return false;
683
684 /* check incomplete u32 in prefix */
685 pbi = prefixlen & 0x1f;
686 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
687 return false;
688
689 return true;
690}
691#endif
692
693static inline bool ipv6_addr_any(const struct in6_addr *a)
694{
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
700 return (a->s6_addr32[0] | a->s6_addr32[1] |
701 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
702#endif
703}
704
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
718/* more secured version of ipv6_addr_hash() */
719static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
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],
726 initval);
727}
728
729static inline bool ipv6_addr_loopback(const struct in6_addr *a)
730{
731#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
732 const __be64 *be = (const __be64 *)a;
733
734 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
735#else
736 return (a->s6_addr32[0] | a->s6_addr32[1] |
737 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
738#endif
739}
740
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 */
745static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
746{
747 return (
748#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
749 *(unsigned long *)a |
750#else
751 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
752#endif
753 (__force unsigned long)(a->s6_addr32[2] ^
754 cpu_to_be32(0x0000ffff))) == 0UL;
755}
756
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
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
778/*
779 * Check for a RFC 4843 ORCHID address
780 * (Overlay Routable Cryptographic Hash Identifiers)
781 */
782static inline bool ipv6_addr_orchid(const struct in6_addr *a)
783{
784 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
785}
786
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
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
801/*
802 * find the first different bit between two addresses
803 * length of address must be a multiple of 32bits
804 */
805static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
806{
807 const __be32 *a1 = token1, *a2 = token2;
808 int i;
809
810 addrlen >>= 2;
811
812 for (i = 0; i < addrlen; i++) {
813 __be32 xb = a1[i] ^ a2[i];
814 if (xb)
815 return i * 32 + 31 - __fls(ntohl(xb));
816 }
817
818 /*
819 * we should *never* get to this point since that
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 */
834 return addrlen << 5;
835}
836
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
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
869__be32 ipv6_select_ident(struct net *net,
870 const struct in6_addr *daddr,
871 const struct in6_addr *saddr);
872__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
873
874int ip6_dst_hoplimit(struct dst_entry *dst);
875
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
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
904#if IS_ENABLED(CONFIG_IPV6)
905
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
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
921#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
922
923static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
924 __be32 flowlabel, bool autolabel,
925 struct flowi6 *fl6)
926{
927 u32 hash;
928
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
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;
939
940 hash = skb_get_hash_flowi6(skb, fl6);
941
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 */
946 hash = rol32(hash, 16);
947
948 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
949
950 if (net->ipv6.sysctl.flowlabel_state_ranges)
951 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
952
953 return flowlabel;
954}
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}
968#else
969static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
970 __be32 flowlabel, bool autolabel,
971 struct flowi6 *fl6)
972{
973 return flowlabel;
974}
975static inline int ip6_default_np_autolabel(struct net *net)
976{
977 return 0;
978}
979#endif
980
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}
986static inline u32 ip6_multipath_hash_fields(const struct net *net)
987{
988 return net->ipv6.sysctl.multipath_hash_fields;
989}
990#else
991static inline int ip6_multipath_hash_policy(const struct net *net)
992{
993 return 0;
994}
995static inline u32 ip6_multipath_hash_fields(const struct net *net)
996{
997 return 0;
998}
999#endif
1000
1001/*
1002 * Header manipulation
1003 */
1004static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
1005 __be32 flowlabel)
1006{
1007 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
1008}
1009
1010static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
1011{
1012 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
1013}
1014
1015static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
1016{
1017 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
1018}
1019
1020static inline u8 ip6_tclass(__be32 flowinfo)
1021{
1022 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
1023}
1024
1025static inline dscp_t ip6_dscp(__be32 flowinfo)
1026{
1027 return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
1028}
1029
1030static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
1031{
1032 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
1033}
1034
1035static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
1036{
1037 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
1038}
1039
1040/*
1041 * Prototypes exported by ipv6
1042 */
1043
1044/*
1045 * rcv function (called from netdevice level)
1046 */
1047
1048int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1049 struct packet_type *pt, struct net_device *orig_dev);
1050void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1051 struct net_device *orig_dev);
1052
1053int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1054
1055/*
1056 * upper-layer output functions
1057 */
1058int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1059 __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
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),
1066 void *from, size_t length, int transhdrlen,
1067 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1068 struct rt6_info *rt, unsigned int flags);
1069
1070int ip6_push_pending_frames(struct sock *sk);
1071
1072void ip6_flush_pending_frames(struct sock *sk);
1073
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),
1082 void *from, size_t length, int transhdrlen,
1083 struct ipcm6_cookie *ipc6,
1084 struct rt6_info *rt, unsigned int flags,
1085 struct inet_cork_full *cork);
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
1093int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1094 struct flowi6 *fl6);
1095struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1096 const struct in6_addr *final_dst);
1097struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1098 const struct in6_addr *final_dst,
1099 bool connected);
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);
1106struct dst_entry *ip6_blackhole_route(struct net *net,
1107 struct dst_entry *orig_dst);
1108
1109/*
1110 * skb processing functions
1111 */
1112
1113int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1114int ip6_forward(struct sk_buff *skb);
1115int ip6_input(struct sk_buff *skb);
1116int ip6_mc_input(struct sk_buff *skb);
1117void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1118 bool have_final);
1119
1120int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1121int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1122
1123/*
1124 * Extension header (options) processing
1125 */
1126
1127void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1128 u8 *proto, struct in6_addr **daddr_p,
1129 struct in6_addr *saddr);
1130void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1131 u8 *proto);
1132
1133int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1134 __be16 *frag_offp);
1135
1136bool ipv6_ext_hdr(u8 nexthdr);
1137
1138enum {
1139 IP6_FH_F_FRAG = (1 << 0),
1140 IP6_FH_F_AUTH = (1 << 1),
1141 IP6_FH_F_SKIP_RH = (1 << 2),
1142};
1143
1144/* find specified header and get offset to it */
1145int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1146 unsigned short *fragoff, int *fragflg);
1147
1148int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1149
1150struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1151 const struct ipv6_txoptions *opt,
1152 struct in6_addr *orig);
1153
1154/*
1155 * socket options (ipv6_sockglue.c)
1156 */
1157DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1158
1159int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1160 unsigned int optlen);
1161int ipv6_getsockopt(struct sock *sk, int level, int optname,
1162 char __user *optval, int __user *optlen);
1163
1164int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1165 int addr_len);
1166int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1167int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1168 int addr_len);
1169int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1170void ip6_datagram_release_cb(struct sock *sk);
1171
1172int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1173 int *addr_len);
1174int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1175 int *addr_len);
1176void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1177 u32 info, u8 *payload);
1178void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1179void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1180
1181int inet6_release(struct socket *sock);
1182int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1183int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1184 int peer);
1185int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1186int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1187 unsigned long arg);
1188
1189int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1190 struct sock *sk);
1191int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1192int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1193 int flags);
1194
1195/*
1196 * reassembly.c
1197 */
1198extern const struct proto_ops inet6_stream_ops;
1199extern const struct proto_ops inet6_dgram_ops;
1200extern const struct proto_ops inet6_sockraw_ops;
1201
1202struct group_source_req;
1203struct group_filter;
1204
1205int ip6_mc_source(int add, int omode, struct sock *sk,
1206 struct group_source_req *pgsr);
1207int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1208 struct sockaddr_storage *list);
1209int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1210 struct sockaddr_storage __user *p);
1211
1212#ifdef CONFIG_PROC_FS
1213int ac6_proc_init(struct net *net);
1214void ac6_proc_exit(struct net *net);
1215int raw6_proc_init(void);
1216void raw6_proc_exit(void);
1217int tcp6_proc_init(struct net *net);
1218void tcp6_proc_exit(struct net *net);
1219int udp6_proc_init(struct net *net);
1220void udp6_proc_exit(struct net *net);
1221int udplite6_proc_init(void);
1222void udplite6_proc_exit(void);
1223int ipv6_misc_proc_init(void);
1224void ipv6_misc_proc_exit(void);
1225int snmp6_register_dev(struct inet6_dev *idev);
1226int snmp6_unregister_dev(struct inet6_dev *idev);
1227
1228#else
1229static inline int ac6_proc_init(struct net *net) { return 0; }
1230static inline void ac6_proc_exit(struct net *net) { }
1231static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1232static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1233#endif
1234
1235#ifdef CONFIG_SYSCTL
1236struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1237struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1238int ipv6_sysctl_register(void);
1239void ipv6_sysctl_unregister(void);
1240#endif
1241
1242int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1243 const struct in6_addr *addr);
1244int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1245 const struct in6_addr *addr, unsigned int mode);
1246int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1247 const struct in6_addr *addr);
1248
1249static inline int ip6_sock_set_v6only(struct sock *sk)
1250{
1251 if (inet_sk(sk)->inet_num)
1252 return -EINVAL;
1253 lock_sock(sk);
1254 sk->sk_ipv6only = true;
1255 release_sock(sk);
1256 return 0;
1257}
1258
1259static inline void ip6_sock_set_recverr(struct sock *sk)
1260{
1261 lock_sock(sk);
1262 inet6_sk(sk)->recverr = true;
1263 release_sock(sk);
1264}
1265
1266static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1267{
1268 unsigned int pref = 0;
1269 unsigned int prefmask = ~0;
1270
1271 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1272 switch (val & (IPV6_PREFER_SRC_PUBLIC |
1273 IPV6_PREFER_SRC_TMP |
1274 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1275 case IPV6_PREFER_SRC_PUBLIC:
1276 pref |= IPV6_PREFER_SRC_PUBLIC;
1277 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1278 IPV6_PREFER_SRC_TMP);
1279 break;
1280 case IPV6_PREFER_SRC_TMP:
1281 pref |= IPV6_PREFER_SRC_TMP;
1282 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1283 IPV6_PREFER_SRC_TMP);
1284 break;
1285 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1286 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1287 IPV6_PREFER_SRC_TMP);
1288 break;
1289 case 0:
1290 break;
1291 default:
1292 return -EINVAL;
1293 }
1294
1295 /* check HOME/COA conflicts */
1296 switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1297 case IPV6_PREFER_SRC_HOME:
1298 prefmask &= ~IPV6_PREFER_SRC_COA;
1299 break;
1300 case IPV6_PREFER_SRC_COA:
1301 pref |= IPV6_PREFER_SRC_COA;
1302 break;
1303 case 0:
1304 break;
1305 default:
1306 return -EINVAL;
1307 }
1308
1309 /* check CGA/NONCGA conflicts */
1310 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1311 case IPV6_PREFER_SRC_CGA:
1312 case IPV6_PREFER_SRC_NONCGA:
1313 case 0:
1314 break;
1315 default:
1316 return -EINVAL;
1317 }
1318
1319 inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1320 return 0;
1321}
1322
1323static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1324{
1325 int ret;
1326
1327 lock_sock(sk);
1328 ret = __ip6_sock_set_addr_preferences(sk, val);
1329 release_sock(sk);
1330 return ret;
1331}
1332
1333static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1334{
1335 lock_sock(sk);
1336 inet6_sk(sk)->rxopt.bits.rxinfo = true;
1337 release_sock(sk);
1338}
1339
1340#endif /* _NET_IPV6_H */
1341

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