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13#ifndef _NET_IPV6_H
14#define _NET_IPV6_H
15
16#include <linux/ipv6.h>
17#include <linux/hardirq.h>
18#include <linux/jhash.h>
19#include <linux/refcount.h>
20#include <net/if_inet6.h>
21#include <net/ndisc.h>
22#include <net/flow.h>
23#include <net/flow_dissector.h>
24#include <net/snmp.h>
25
26#define SIN6_LEN_RFC2133 24
27
28#define IPV6_MAXPLEN 65535
29
30
31
32
33
34#define NEXTHDR_HOP 0
35#define NEXTHDR_TCP 6
36#define NEXTHDR_UDP 17
37#define NEXTHDR_IPV6 41
38#define NEXTHDR_ROUTING 43
39#define NEXTHDR_FRAGMENT 44
40#define NEXTHDR_GRE 47
41#define NEXTHDR_ESP 50
42#define NEXTHDR_AUTH 51
43#define NEXTHDR_ICMP 58
44#define NEXTHDR_NONE 59
45#define NEXTHDR_DEST 60
46#define NEXTHDR_SCTP 132
47#define NEXTHDR_MOBILITY 135
48
49#define NEXTHDR_MAX 255
50
51#define IPV6_DEFAULT_HOPLIMIT 64
52#define IPV6_DEFAULT_MCASTHOPS 1
53
54
55
56
57
58
59
60
61
62
63
64
65#define IPV6_ADDR_ANY 0x0000U
66
67#define IPV6_ADDR_UNICAST 0x0001U
68#define IPV6_ADDR_MULTICAST 0x0002U
69
70#define IPV6_ADDR_LOOPBACK 0x0010U
71#define IPV6_ADDR_LINKLOCAL 0x0020U
72#define IPV6_ADDR_SITELOCAL 0x0040U
73
74#define IPV6_ADDR_COMPATv4 0x0080U
75
76#define IPV6_ADDR_SCOPE_MASK 0x00f0U
77
78#define IPV6_ADDR_MAPPED 0x1000U
79
80
81
82
83#define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f)
85#define __IPV6_ADDR_SCOPE_INVALID -1
86#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
91
92
93
94
95#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
96 ((a)->s6_addr[1] & 0x10)
97#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
98 ((a)->s6_addr[1] & 0x20)
99#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
100 ((a)->s6_addr[1] & 0x40)
101
102
103
104
105
106struct frag_hdr {
107 __u8 nexthdr;
108 __u8 reserved;
109 __be16 frag_off;
110 __be32 identification;
111};
112
113#define IP6_MF 0x0001
114#define IP6_OFFSET 0xFFF8
115
116#define IP6_REPLY_MARK(net, mark) \
117 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
118
119#include <net/sock.h>
120
121
122extern int sysctl_mld_max_msf;
123extern int sysctl_mld_qrv;
124
125#define _DEVINC(net, statname, mod, idev, field) \
126({ \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
130 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
131})
132
133
134#define _DEVINCATOMIC(net, statname, mod, idev, field) \
135({ \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
139 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
140})
141
142
143#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
144({ \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
148 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
149})
150
151#define _DEVADD(net, statname, mod, idev, field, val) \
152({ \
153 struct inet6_dev *_idev = (idev); \
154 if (likely(_idev != NULL)) \
155 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
156 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
157})
158
159#define _DEVUPD(net, statname, mod, idev, field, val) \
160({ \
161 struct inet6_dev *_idev = (idev); \
162 if (likely(_idev != NULL)) \
163 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
164 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
165})
166
167
168
169#define IP6_INC_STATS(net, idev,field) \
170 _DEVINC(net, ipv6, , idev, field)
171#define __IP6_INC_STATS(net, idev,field) \
172 _DEVINC(net, ipv6, __, idev, field)
173#define IP6_ADD_STATS(net, idev,field,val) \
174 _DEVADD(net, ipv6, , idev, field, val)
175#define __IP6_ADD_STATS(net, idev,field,val) \
176 _DEVADD(net, ipv6, __, idev, field, val)
177#define IP6_UPD_PO_STATS(net, idev,field,val) \
178 _DEVUPD(net, ipv6, , idev, field, val)
179#define __IP6_UPD_PO_STATS(net, idev,field,val) \
180 _DEVUPD(net, ipv6, __, idev, field, val)
181#define ICMP6_INC_STATS(net, idev, field) \
182 _DEVINCATOMIC(net, icmpv6, , idev, field)
183#define __ICMP6_INC_STATS(net, idev, field) \
184 _DEVINCATOMIC(net, icmpv6, __, idev, field)
185
186#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
188#define ICMP6MSGIN_INC_STATS(net, idev, field) \
189 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
190
191struct ip6_ra_chain {
192 struct ip6_ra_chain *next;
193 struct sock *sk;
194 int sel;
195 void (*destructor)(struct sock *);
196};
197
198extern struct ip6_ra_chain *ip6_ra_chain;
199extern rwlock_t ip6_ra_lock;
200
201
202
203
204
205
206struct ipv6_txoptions {
207 refcount_t refcnt;
208
209 int tot_len;
210
211
212
213 __u16 opt_flen;
214 __u16 opt_nflen;
215
216 struct ipv6_opt_hdr *hopopt;
217 struct ipv6_opt_hdr *dst0opt;
218 struct ipv6_rt_hdr *srcrt;
219 struct ipv6_opt_hdr *dst1opt;
220 struct rcu_head rcu;
221
222};
223
224struct ip6_flowlabel {
225 struct ip6_flowlabel __rcu *next;
226 __be32 label;
227 atomic_t users;
228 struct in6_addr dst;
229 struct ipv6_txoptions *opt;
230 unsigned long linger;
231 struct rcu_head rcu;
232 u8 share;
233 union {
234 struct pid *pid;
235 kuid_t uid;
236 } owner;
237 unsigned long lastuse;
238 unsigned long expires;
239 struct net *fl_net;
240};
241
242#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
243#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
244#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
245
246#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
247#define IPV6_TCLASS_SHIFT 20
248
249struct ipv6_fl_socklist {
250 struct ipv6_fl_socklist __rcu *next;
251 struct ip6_flowlabel *fl;
252 struct rcu_head rcu;
253};
254
255struct ipcm6_cookie {
256 __s16 hlimit;
257 __s16 tclass;
258 __s8 dontfrag;
259 struct ipv6_txoptions *opt;
260};
261
262static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
263{
264 struct ipv6_txoptions *opt;
265
266 rcu_read_lock();
267 opt = rcu_dereference(np->opt);
268 if (opt) {
269 if (!refcount_inc_not_zero(&opt->refcnt))
270 opt = NULL;
271 else
272 opt = rcu_pointer_handoff(opt);
273 }
274 rcu_read_unlock();
275 return opt;
276}
277
278static inline void txopt_put(struct ipv6_txoptions *opt)
279{
280 if (opt && refcount_dec_and_test(&opt->refcnt))
281 kfree_rcu(opt, rcu);
282}
283
284struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
285struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
286 struct ip6_flowlabel *fl,
287 struct ipv6_txoptions *fopt);
288void fl6_free_socklist(struct sock *sk);
289int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
290int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
291 int flags);
292int ip6_flowlabel_init(void);
293void ip6_flowlabel_cleanup(void);
294
295static inline void fl6_sock_release(struct ip6_flowlabel *fl)
296{
297 if (fl)
298 atomic_dec(&fl->users);
299}
300
301void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
302
303int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
304 struct icmp6hdr *thdr, int len);
305
306int ip6_ra_control(struct sock *sk, int sel);
307
308int ipv6_parse_hopopts(struct sk_buff *skb);
309
310struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
311 struct ipv6_txoptions *opt);
312struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
313 struct ipv6_txoptions *opt,
314 int newtype,
315 struct ipv6_opt_hdr __user *newopt,
316 int newoptlen);
317struct ipv6_txoptions *
318ipv6_renew_options_kern(struct sock *sk,
319 struct ipv6_txoptions *opt,
320 int newtype,
321 struct ipv6_opt_hdr *newopt,
322 int newoptlen);
323struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
324 struct ipv6_txoptions *opt);
325
326bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
327 const struct inet6_skb_parm *opt);
328struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
329 struct ipv6_txoptions *opt);
330
331static inline bool ipv6_accept_ra(struct inet6_dev *idev)
332{
333
334
335
336 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
337 idev->cnf.accept_ra;
338}
339
340#if IS_ENABLED(CONFIG_IPV6)
341static inline int ip6_frag_mem(struct net *net)
342{
343 return sum_frag_mem_limit(&net->ipv6.frags);
344}
345#endif
346
347#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024)
348#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024)
349#define IPV6_FRAG_TIMEOUT (60 * HZ)
350
351int __ipv6_addr_type(const struct in6_addr *addr);
352static inline int ipv6_addr_type(const struct in6_addr *addr)
353{
354 return __ipv6_addr_type(addr) & 0xffff;
355}
356
357static inline int ipv6_addr_scope(const struct in6_addr *addr)
358{
359 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
360}
361
362static inline int __ipv6_addr_src_scope(int type)
363{
364 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
365}
366
367static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
368{
369 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
370}
371
372static inline bool __ipv6_addr_needs_scope_id(int type)
373{
374 return type & IPV6_ADDR_LINKLOCAL ||
375 (type & IPV6_ADDR_MULTICAST &&
376 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
377}
378
379static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
380{
381 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
382}
383
384static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
385{
386 return memcmp(a1, a2, sizeof(struct in6_addr));
387}
388
389static inline bool
390ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
391 const struct in6_addr *a2)
392{
393#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
394 const unsigned long *ul1 = (const unsigned long *)a1;
395 const unsigned long *ulm = (const unsigned long *)m;
396 const unsigned long *ul2 = (const unsigned long *)a2;
397
398 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
399 ((ul1[1] ^ ul2[1]) & ulm[1]));
400#else
401 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
402 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
403 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
404 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
405#endif
406}
407
408static inline void ipv6_addr_prefix(struct in6_addr *pfx,
409 const struct in6_addr *addr,
410 int plen)
411{
412
413 int o = plen >> 3,
414 b = plen & 0x7;
415
416 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
417 memcpy(pfx->s6_addr, addr, o);
418 if (b != 0)
419 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
420}
421
422static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
423 const struct in6_addr *pfx,
424 int plen)
425{
426
427 int o = plen >> 3,
428 b = plen & 0x7;
429
430 memcpy(addr->s6_addr, pfx, o);
431 if (b != 0) {
432 addr->s6_addr[o] &= ~(0xff00 >> b);
433 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
434 }
435}
436
437static inline void __ipv6_addr_set_half(__be32 *addr,
438 __be32 wh, __be32 wl)
439{
440#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
441#if defined(__BIG_ENDIAN)
442 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
443 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
444 return;
445 }
446#elif defined(__LITTLE_ENDIAN)
447 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
448 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
449 return;
450 }
451#endif
452#endif
453 addr[0] = wh;
454 addr[1] = wl;
455}
456
457static inline void ipv6_addr_set(struct in6_addr *addr,
458 __be32 w1, __be32 w2,
459 __be32 w3, __be32 w4)
460{
461 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
462 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
463}
464
465static inline bool ipv6_addr_equal(const struct in6_addr *a1,
466 const struct in6_addr *a2)
467{
468#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
469 const unsigned long *ul1 = (const unsigned long *)a1;
470 const unsigned long *ul2 = (const unsigned long *)a2;
471
472 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
473#else
474 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
475 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
476 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
477 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
478#endif
479}
480
481#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
482static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
483 const __be64 *a2,
484 unsigned int len)
485{
486 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
487 return false;
488 return true;
489}
490
491static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
492 const struct in6_addr *addr2,
493 unsigned int prefixlen)
494{
495 const __be64 *a1 = (const __be64 *)addr1;
496 const __be64 *a2 = (const __be64 *)addr2;
497
498 if (prefixlen >= 64) {
499 if (a1[0] ^ a2[0])
500 return false;
501 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
502 }
503 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
504}
505#else
506static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
507 const struct in6_addr *addr2,
508 unsigned int prefixlen)
509{
510 const __be32 *a1 = addr1->s6_addr32;
511 const __be32 *a2 = addr2->s6_addr32;
512 unsigned int pdw, pbi;
513
514
515 pdw = prefixlen >> 5;
516 if (pdw && memcmp(a1, a2, pdw << 2))
517 return false;
518
519
520 pbi = prefixlen & 0x1f;
521 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
522 return false;
523
524 return true;
525}
526#endif
527
528struct inet_frag_queue;
529
530enum ip6_defrag_users {
531 IP6_DEFRAG_LOCAL_DELIVER,
532 IP6_DEFRAG_CONNTRACK_IN,
533 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
534 IP6_DEFRAG_CONNTRACK_OUT,
535 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
536 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
537 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
538};
539
540struct ip6_create_arg {
541 __be32 id;
542 u32 user;
543 const struct in6_addr *src;
544 const struct in6_addr *dst;
545 int iif;
546 u8 ecn;
547};
548
549void ip6_frag_init(struct inet_frag_queue *q, const void *a);
550bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
551
552
553
554
555struct frag_queue {
556 struct inet_frag_queue q;
557
558 __be32 id;
559 u32 user;
560 struct in6_addr saddr;
561 struct in6_addr daddr;
562
563 int iif;
564 unsigned int csum;
565 __u16 nhoffset;
566 u8 ecn;
567};
568
569void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
570 struct inet_frags *frags);
571
572static inline bool ipv6_addr_any(const struct in6_addr *a)
573{
574#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
575 const unsigned long *ul = (const unsigned long *)a;
576
577 return (ul[0] | ul[1]) == 0UL;
578#else
579 return (a->s6_addr32[0] | a->s6_addr32[1] |
580 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
581#endif
582}
583
584static inline u32 ipv6_addr_hash(const struct in6_addr *a)
585{
586#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
587 const unsigned long *ul = (const unsigned long *)a;
588 unsigned long x = ul[0] ^ ul[1];
589
590 return (u32)(x ^ (x >> 32));
591#else
592 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
593 a->s6_addr32[2] ^ a->s6_addr32[3]);
594#endif
595}
596
597
598static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
599{
600 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
601
602 return jhash_3words(v,
603 (__force u32)a->s6_addr32[2],
604 (__force u32)a->s6_addr32[3],
605 initval);
606}
607
608static inline bool ipv6_addr_loopback(const struct in6_addr *a)
609{
610#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
611 const __be64 *be = (const __be64 *)a;
612
613 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
614#else
615 return (a->s6_addr32[0] | a->s6_addr32[1] |
616 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
617#endif
618}
619
620
621
622
623
624static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
625{
626 return (
627#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
628 *(unsigned long *)a |
629#else
630 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
631#endif
632 (__force unsigned long)(a->s6_addr32[2] ^
633 cpu_to_be32(0x0000ffff))) == 0UL;
634}
635
636
637
638
639
640static inline bool ipv6_addr_orchid(const struct in6_addr *a)
641{
642 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
643}
644
645static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
646{
647 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
648}
649
650static inline void ipv6_addr_set_v4mapped(const __be32 addr,
651 struct in6_addr *v4mapped)
652{
653 ipv6_addr_set(v4mapped,
654 0, 0,
655 htonl(0x0000FFFF),
656 addr);
657}
658
659
660
661
662
663static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
664{
665 const __be32 *a1 = token1, *a2 = token2;
666 int i;
667
668 addrlen >>= 2;
669
670 for (i = 0; i < addrlen; i++) {
671 __be32 xb = a1[i] ^ a2[i];
672 if (xb)
673 return i * 32 + 31 - __fls(ntohl(xb));
674 }
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692 return addrlen << 5;
693}
694
695#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
696static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
697{
698 const __be64 *a1 = token1, *a2 = token2;
699 int i;
700
701 addrlen >>= 3;
702
703 for (i = 0; i < addrlen; i++) {
704 __be64 xb = a1[i] ^ a2[i];
705 if (xb)
706 return i * 64 + 63 - __fls(be64_to_cpu(xb));
707 }
708
709 return addrlen << 6;
710}
711#endif
712
713static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
714{
715#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
716 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
717 return __ipv6_addr_diff64(token1, token2, addrlen);
718#endif
719 return __ipv6_addr_diff32(token1, token2, addrlen);
720}
721
722static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
723{
724 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
725}
726
727__be32 ipv6_select_ident(struct net *net,
728 const struct in6_addr *daddr,
729 const struct in6_addr *saddr);
730void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
731
732int ip6_dst_hoplimit(struct dst_entry *dst);
733
734static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
735 struct dst_entry *dst)
736{
737 int hlimit;
738
739 if (ipv6_addr_is_multicast(&fl6->daddr))
740 hlimit = np->mcast_hops;
741 else
742 hlimit = np->hop_limit;
743 if (hlimit < 0)
744 hlimit = ip6_dst_hoplimit(dst);
745 return hlimit;
746}
747
748
749
750
751
752static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
753 const struct ipv6hdr *iph)
754{
755 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
756 offsetof(typeof(flow->addrs), v6addrs.src) +
757 sizeof(flow->addrs.v6addrs.src));
758 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
759 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
760}
761
762#if IS_ENABLED(CONFIG_IPV6)
763
764
765#define IP6_AUTO_FLOW_LABEL_OFF 0
766#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
767#define IP6_AUTO_FLOW_LABEL_OPTIN 2
768#define IP6_AUTO_FLOW_LABEL_FORCED 3
769
770#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
771
772#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
773
774static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
775 __be32 flowlabel, bool autolabel,
776 struct flowi6 *fl6)
777{
778 u32 hash;
779
780
781
782
783 flowlabel &= IPV6_FLOWLABEL_MASK;
784
785 if (flowlabel ||
786 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
787 (!autolabel &&
788 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
789 return flowlabel;
790
791 hash = skb_get_hash_flowi6(skb, fl6);
792
793
794
795
796
797 rol32(hash, 16);
798
799 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
800
801 if (net->ipv6.sysctl.flowlabel_state_ranges)
802 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
803
804 return flowlabel;
805}
806
807static inline int ip6_default_np_autolabel(struct net *net)
808{
809 switch (net->ipv6.sysctl.auto_flowlabels) {
810 case IP6_AUTO_FLOW_LABEL_OFF:
811 case IP6_AUTO_FLOW_LABEL_OPTIN:
812 default:
813 return 0;
814 case IP6_AUTO_FLOW_LABEL_OPTOUT:
815 case IP6_AUTO_FLOW_LABEL_FORCED:
816 return 1;
817 }
818}
819#else
820static inline void ip6_set_txhash(struct sock *sk) { }
821static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
822 __be32 flowlabel, bool autolabel,
823 struct flowi6 *fl6)
824{
825 return flowlabel;
826}
827static inline int ip6_default_np_autolabel(struct net *net)
828{
829 return 0;
830}
831#endif
832
833
834
835
836
837static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
838 __be32 flowlabel)
839{
840 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
841}
842
843static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
844{
845 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
846}
847
848static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
849{
850 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
851}
852
853static inline u8 ip6_tclass(__be32 flowinfo)
854{
855 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
856}
857
858static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
859{
860 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
861}
862
863
864
865
866
867
868
869
870
871int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
872 struct packet_type *pt, struct net_device *orig_dev);
873
874int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
875
876
877
878
879int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
880 __u32 mark, struct ipv6_txoptions *opt, int tclass);
881
882int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
883
884int ip6_append_data(struct sock *sk,
885 int getfrag(void *from, char *to, int offset, int len,
886 int odd, struct sk_buff *skb),
887 void *from, int length, int transhdrlen,
888 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
889 struct rt6_info *rt, unsigned int flags,
890 const struct sockcm_cookie *sockc);
891
892int ip6_push_pending_frames(struct sock *sk);
893
894void ip6_flush_pending_frames(struct sock *sk);
895
896int ip6_send_skb(struct sk_buff *skb);
897
898struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
899 struct inet_cork_full *cork,
900 struct inet6_cork *v6_cork);
901struct sk_buff *ip6_make_skb(struct sock *sk,
902 int getfrag(void *from, char *to, int offset,
903 int len, int odd, struct sk_buff *skb),
904 void *from, int length, int transhdrlen,
905 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
906 struct rt6_info *rt, unsigned int flags,
907 const struct sockcm_cookie *sockc);
908
909static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
910{
911 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
912 &inet6_sk(sk)->cork);
913}
914
915int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
916 struct flowi6 *fl6);
917struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
918 const struct in6_addr *final_dst);
919struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
920 const struct in6_addr *final_dst);
921struct dst_entry *ip6_blackhole_route(struct net *net,
922 struct dst_entry *orig_dst);
923
924
925
926
927
928int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
929int ip6_forward(struct sk_buff *skb);
930int ip6_input(struct sk_buff *skb);
931int ip6_mc_input(struct sk_buff *skb);
932
933int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
934int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
935
936
937
938
939
940void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
941 u8 *proto, struct in6_addr **daddr_p,
942 struct in6_addr *saddr);
943void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
944 u8 *proto);
945
946int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
947 __be16 *frag_offp);
948
949bool ipv6_ext_hdr(u8 nexthdr);
950
951enum {
952 IP6_FH_F_FRAG = (1 << 0),
953 IP6_FH_F_AUTH = (1 << 1),
954 IP6_FH_F_SKIP_RH = (1 << 2),
955};
956
957
958int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
959 unsigned short *fragoff, int *fragflg);
960
961int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
962
963struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
964 const struct ipv6_txoptions *opt,
965 struct in6_addr *orig);
966
967
968
969
970
971int ipv6_setsockopt(struct sock *sk, int level, int optname,
972 char __user *optval, unsigned int optlen);
973int ipv6_getsockopt(struct sock *sk, int level, int optname,
974 char __user *optval, int __user *optlen);
975int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
976 char __user *optval, unsigned int optlen);
977int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
978 char __user *optval, int __user *optlen);
979
980int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
981 int addr_len);
982int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
983int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
984 int addr_len);
985int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
986void ip6_datagram_release_cb(struct sock *sk);
987
988int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
989 int *addr_len);
990int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
991 int *addr_len);
992void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
993 u32 info, u8 *payload);
994void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
995void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
996
997int inet6_release(struct socket *sock);
998int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
999int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
1000 int peer);
1001int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1002
1003int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1004 struct sock *sk);
1005
1006
1007
1008
1009extern const struct proto_ops inet6_stream_ops;
1010extern const struct proto_ops inet6_dgram_ops;
1011extern const struct proto_ops inet6_sockraw_ops;
1012
1013struct group_source_req;
1014struct group_filter;
1015
1016int ip6_mc_source(int add, int omode, struct sock *sk,
1017 struct group_source_req *pgsr);
1018int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1019int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1020 struct group_filter __user *optval, int __user *optlen);
1021
1022#ifdef CONFIG_PROC_FS
1023int ac6_proc_init(struct net *net);
1024void ac6_proc_exit(struct net *net);
1025int raw6_proc_init(void);
1026void raw6_proc_exit(void);
1027int tcp6_proc_init(struct net *net);
1028void tcp6_proc_exit(struct net *net);
1029int udp6_proc_init(struct net *net);
1030void udp6_proc_exit(struct net *net);
1031int udplite6_proc_init(void);
1032void udplite6_proc_exit(void);
1033int ipv6_misc_proc_init(void);
1034void ipv6_misc_proc_exit(void);
1035int snmp6_register_dev(struct inet6_dev *idev);
1036int snmp6_unregister_dev(struct inet6_dev *idev);
1037
1038#else
1039static inline int ac6_proc_init(struct net *net) { return 0; }
1040static inline void ac6_proc_exit(struct net *net) { }
1041static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1042static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1043#endif
1044
1045#ifdef CONFIG_SYSCTL
1046extern struct ctl_table ipv6_route_table_template[];
1047
1048struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1049struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1050int ipv6_sysctl_register(void);
1051void ipv6_sysctl_unregister(void);
1052#endif
1053
1054int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1055 const struct in6_addr *addr);
1056int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1057 const struct in6_addr *addr);
1058#endif
1059
