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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 <net/if_inet6.h>
17#include <net/ndisc.h>
18#include <net/flow.h>
19#include <net/flow_dissector.h>
20#include <net/snmp.h>
21#include <net/netns/hash.h>
22
23#define SIN6_LEN_RFC2133 24
24
25#define IPV6_MAXPLEN 65535
26
27
28
29
30
31#define NEXTHDR_HOP 0
32#define NEXTHDR_TCP 6
33#define NEXTHDR_UDP 17
34#define NEXTHDR_IPV6 41
35#define NEXTHDR_ROUTING 43
36#define NEXTHDR_FRAGMENT 44
37#define NEXTHDR_GRE 47
38#define NEXTHDR_ESP 50
39#define NEXTHDR_AUTH 51
40#define NEXTHDR_ICMP 58
41#define NEXTHDR_NONE 59
42#define NEXTHDR_DEST 60
43#define NEXTHDR_SCTP 132
44#define NEXTHDR_MOBILITY 135
45
46#define NEXTHDR_MAX 255
47
48#define IPV6_DEFAULT_HOPLIMIT 64
49#define IPV6_DEFAULT_MCASTHOPS 1
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85
86#define IP6_DEFAULT_MAX_DST_OPTS_CNT 8
87#define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8
88#define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX
89#define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX
90
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100
101
102#define IPV6_ADDR_ANY 0x0000U
103
104#define IPV6_ADDR_UNICAST 0x0001U
105#define IPV6_ADDR_MULTICAST 0x0002U
106
107#define IPV6_ADDR_LOOPBACK 0x0010U
108#define IPV6_ADDR_LINKLOCAL 0x0020U
109#define IPV6_ADDR_SITELOCAL 0x0040U
110
111#define IPV6_ADDR_COMPATv4 0x0080U
112
113#define IPV6_ADDR_SCOPE_MASK 0x00f0U
114
115#define IPV6_ADDR_MAPPED 0x1000U
116
117
118
119
120#define IPV6_ADDR_MC_SCOPE(a) \
121 ((a)->s6_addr[1] & 0x0f)
122#define __IPV6_ADDR_SCOPE_INVALID -1
123#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
124#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
125#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
126#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
127#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
128
129
130
131
132#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
133 ((a)->s6_addr[1] & 0x10)
134#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
135 ((a)->s6_addr[1] & 0x20)
136#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
137 ((a)->s6_addr[1] & 0x40)
138
139
140
141
142
143struct frag_hdr {
144 __u8 nexthdr;
145 __u8 reserved;
146 __be16 frag_off;
147 __be32 identification;
148};
149
150#define IP6_MF 0x0001
151#define IP6_OFFSET 0xFFF8
152
153#define IP6_REPLY_MARK(net, mark) \
154 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
155
156#include <net/sock.h>
157
158
159extern int sysctl_mld_max_msf;
160extern int sysctl_mld_qrv;
161
162#define _DEVINC(net, statname, mod, idev, field) \
163({ \
164 struct inet6_dev *_idev = (idev); \
165 if (likely(_idev != NULL)) \
166 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
167 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
168})
169
170
171#define _DEVINCATOMIC(net, statname, mod, idev, field) \
172({ \
173 struct inet6_dev *_idev = (idev); \
174 if (likely(_idev != NULL)) \
175 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
176 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
177})
178
179
180#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
181({ \
182 struct inet6_dev *_idev = (idev); \
183 if (likely(_idev != NULL)) \
184 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
185 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
186})
187
188#define _DEVADD(net, statname, mod, idev, field, val) \
189({ \
190 struct inet6_dev *_idev = (idev); \
191 if (likely(_idev != NULL)) \
192 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
193 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
194})
195
196#define _DEVUPD(net, statname, mod, idev, field, val) \
197({ \
198 struct inet6_dev *_idev = (idev); \
199 if (likely(_idev != NULL)) \
200 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
201 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
202})
203
204
205
206#define IP6_INC_STATS(net, idev,field) \
207 _DEVINC(net, ipv6, , idev, field)
208#define __IP6_INC_STATS(net, idev,field) \
209 _DEVINC(net, ipv6, __, idev, field)
210#define IP6_ADD_STATS(net, idev,field,val) \
211 _DEVADD(net, ipv6, , idev, field, val)
212#define __IP6_ADD_STATS(net, idev,field,val) \
213 _DEVADD(net, ipv6, __, idev, field, val)
214#define IP6_UPD_PO_STATS(net, idev,field,val) \
215 _DEVUPD(net, ipv6, , idev, field, val)
216#define __IP6_UPD_PO_STATS(net, idev,field,val) \
217 _DEVUPD(net, ipv6, __, idev, field, val)
218#define ICMP6_INC_STATS(net, idev, field) \
219 _DEVINCATOMIC(net, icmpv6, , idev, field)
220#define __ICMP6_INC_STATS(net, idev, field) \
221 _DEVINCATOMIC(net, icmpv6, __, idev, field)
222
223#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
224 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
225#define ICMP6MSGIN_INC_STATS(net, idev, field) \
226 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
227
228struct ip6_ra_chain {
229 struct ip6_ra_chain *next;
230 struct sock *sk;
231 int sel;
232 void (*destructor)(struct sock *);
233};
234
235extern struct ip6_ra_chain *ip6_ra_chain;
236extern rwlock_t ip6_ra_lock;
237
238
239
240
241
242
243struct ipv6_txoptions {
244 refcount_t refcnt;
245
246 int tot_len;
247
248
249
250 __u16 opt_flen;
251 __u16 opt_nflen;
252
253 struct ipv6_opt_hdr *hopopt;
254 struct ipv6_opt_hdr *dst0opt;
255 struct ipv6_rt_hdr *srcrt;
256 struct ipv6_opt_hdr *dst1opt;
257 struct rcu_head rcu;
258
259};
260
261struct ip6_flowlabel {
262 struct ip6_flowlabel __rcu *next;
263 __be32 label;
264 atomic_t users;
265 struct in6_addr dst;
266 struct ipv6_txoptions *opt;
267 unsigned long linger;
268 struct rcu_head rcu;
269 u8 share;
270 union {
271 struct pid *pid;
272 kuid_t uid;
273 } owner;
274 unsigned long lastuse;
275 unsigned long expires;
276 struct net *fl_net;
277};
278
279#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
280#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
281#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
282
283#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
284#define IPV6_TCLASS_SHIFT 20
285
286struct ipv6_fl_socklist {
287 struct ipv6_fl_socklist __rcu *next;
288 struct ip6_flowlabel *fl;
289 struct rcu_head rcu;
290};
291
292struct ipcm6_cookie {
293 struct sockcm_cookie sockc;
294 __s16 hlimit;
295 __s16 tclass;
296 __s8 dontfrag;
297 struct ipv6_txoptions *opt;
298 __u16 gso_size;
299};
300
301static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
302{
303 *ipc6 = (struct ipcm6_cookie) {
304 .hlimit = -1,
305 .tclass = -1,
306 .dontfrag = -1,
307 };
308}
309
310static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
311 const struct ipv6_pinfo *np)
312{
313 *ipc6 = (struct ipcm6_cookie) {
314 .hlimit = -1,
315 .tclass = np->tclass,
316 .dontfrag = np->dontfrag,
317 };
318}
319
320static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
321{
322 struct ipv6_txoptions *opt;
323
324 rcu_read_lock();
325 opt = rcu_dereference(np->opt);
326 if (opt) {
327 if (!refcount_inc_not_zero(&opt->refcnt))
328 opt = NULL;
329 else
330 opt = rcu_pointer_handoff(opt);
331 }
332 rcu_read_unlock();
333 return opt;
334}
335
336static inline void txopt_put(struct ipv6_txoptions *opt)
337{
338 if (opt && refcount_dec_and_test(&opt->refcnt))
339 kfree_rcu(opt, rcu);
340}
341
342struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
343struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
344 struct ip6_flowlabel *fl,
345 struct ipv6_txoptions *fopt);
346void fl6_free_socklist(struct sock *sk);
347int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
348int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
349 int flags);
350int ip6_flowlabel_init(void);
351void ip6_flowlabel_cleanup(void);
352bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
353
354static inline void fl6_sock_release(struct ip6_flowlabel *fl)
355{
356 if (fl)
357 atomic_dec(&fl->users);
358}
359
360void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
361
362void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
363 struct icmp6hdr *thdr, int len);
364
365int ip6_ra_control(struct sock *sk, int sel);
366
367int ipv6_parse_hopopts(struct sk_buff *skb);
368
369struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
370 struct ipv6_txoptions *opt);
371struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
372 struct ipv6_txoptions *opt,
373 int newtype,
374 struct ipv6_opt_hdr *newopt);
375struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
376 struct ipv6_txoptions *opt);
377
378bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
379 const struct inet6_skb_parm *opt);
380struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
381 struct ipv6_txoptions *opt);
382
383static inline bool ipv6_accept_ra(struct inet6_dev *idev)
384{
385
386
387
388 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
389 idev->cnf.accept_ra;
390}
391
392#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024)
393#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024)
394#define IPV6_FRAG_TIMEOUT (60 * HZ)
395
396int __ipv6_addr_type(const struct in6_addr *addr);
397static inline int ipv6_addr_type(const struct in6_addr *addr)
398{
399 return __ipv6_addr_type(addr) & 0xffff;
400}
401
402static inline int ipv6_addr_scope(const struct in6_addr *addr)
403{
404 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
405}
406
407static inline int __ipv6_addr_src_scope(int type)
408{
409 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
410}
411
412static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
413{
414 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
415}
416
417static inline bool __ipv6_addr_needs_scope_id(int type)
418{
419 return type & IPV6_ADDR_LINKLOCAL ||
420 (type & IPV6_ADDR_MULTICAST &&
421 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
422}
423
424static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
425{
426 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
427}
428
429static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
430{
431 return memcmp(a1, a2, sizeof(struct in6_addr));
432}
433
434static inline bool
435ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
436 const struct in6_addr *a2)
437{
438#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
439 const unsigned long *ul1 = (const unsigned long *)a1;
440 const unsigned long *ulm = (const unsigned long *)m;
441 const unsigned long *ul2 = (const unsigned long *)a2;
442
443 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
444 ((ul1[1] ^ ul2[1]) & ulm[1]));
445#else
446 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
447 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
448 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
449 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
450#endif
451}
452
453static inline void ipv6_addr_prefix(struct in6_addr *pfx,
454 const struct in6_addr *addr,
455 int plen)
456{
457
458 int o = plen >> 3,
459 b = plen & 0x7;
460
461 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
462 memcpy(pfx->s6_addr, addr, o);
463 if (b != 0)
464 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
465}
466
467static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
468 const struct in6_addr *pfx,
469 int plen)
470{
471
472 int o = plen >> 3,
473 b = plen & 0x7;
474
475 memcpy(addr->s6_addr, pfx, o);
476 if (b != 0) {
477 addr->s6_addr[o] &= ~(0xff00 >> b);
478 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
479 }
480}
481
482static inline void __ipv6_addr_set_half(__be32 *addr,
483 __be32 wh, __be32 wl)
484{
485#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
486#if defined(__BIG_ENDIAN)
487 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
488 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
489 return;
490 }
491#elif defined(__LITTLE_ENDIAN)
492 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
493 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
494 return;
495 }
496#endif
497#endif
498 addr[0] = wh;
499 addr[1] = wl;
500}
501
502static inline void ipv6_addr_set(struct in6_addr *addr,
503 __be32 w1, __be32 w2,
504 __be32 w3, __be32 w4)
505{
506 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
507 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
508}
509
510static inline bool ipv6_addr_equal(const struct in6_addr *a1,
511 const struct in6_addr *a2)
512{
513#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
514 const unsigned long *ul1 = (const unsigned long *)a1;
515 const unsigned long *ul2 = (const unsigned long *)a2;
516
517 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
518#else
519 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
520 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
521 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
522 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
523#endif
524}
525
526#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
527static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
528 const __be64 *a2,
529 unsigned int len)
530{
531 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
532 return false;
533 return true;
534}
535
536static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
537 const struct in6_addr *addr2,
538 unsigned int prefixlen)
539{
540 const __be64 *a1 = (const __be64 *)addr1;
541 const __be64 *a2 = (const __be64 *)addr2;
542
543 if (prefixlen >= 64) {
544 if (a1[0] ^ a2[0])
545 return false;
546 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
547 }
548 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
549}
550#else
551static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
552 const struct in6_addr *addr2,
553 unsigned int prefixlen)
554{
555 const __be32 *a1 = addr1->s6_addr32;
556 const __be32 *a2 = addr2->s6_addr32;
557 unsigned int pdw, pbi;
558
559
560 pdw = prefixlen >> 5;
561 if (pdw && memcmp(a1, a2, pdw << 2))
562 return false;
563
564
565 pbi = prefixlen & 0x1f;
566 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
567 return false;
568
569 return true;
570}
571#endif
572
573static inline bool ipv6_addr_any(const struct in6_addr *a)
574{
575#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
576 const unsigned long *ul = (const unsigned long *)a;
577
578 return (ul[0] | ul[1]) == 0UL;
579#else
580 return (a->s6_addr32[0] | a->s6_addr32[1] |
581 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
582#endif
583}
584
585static inline u32 ipv6_addr_hash(const struct in6_addr *a)
586{
587#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
588 const unsigned long *ul = (const unsigned long *)a;
589 unsigned long x = ul[0] ^ ul[1];
590
591 return (u32)(x ^ (x >> 32));
592#else
593 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
594 a->s6_addr32[2] ^ a->s6_addr32[3]);
595#endif
596}
597
598
599static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
600{
601 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
602
603 return jhash_3words(v,
604 (__force u32)a->s6_addr32[2],
605 (__force u32)a->s6_addr32[3],
606 initval);
607}
608
609static inline bool ipv6_addr_loopback(const struct in6_addr *a)
610{
611#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
612 const __be64 *be = (const __be64 *)a;
613
614 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
615#else
616 return (a->s6_addr32[0] | a->s6_addr32[1] |
617 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
618#endif
619}
620
621
622
623
624
625static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
626{
627 return (
628#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
629 *(unsigned long *)a |
630#else
631 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
632#endif
633 (__force unsigned long)(a->s6_addr32[2] ^
634 cpu_to_be32(0x0000ffff))) == 0UL;
635}
636
637static inline u32 ipv6_portaddr_hash(const struct net *net,
638 const struct in6_addr *addr6,
639 unsigned int port)
640{
641 unsigned int hash, mix = net_hash_mix(net);
642
643 if (ipv6_addr_any(addr6))
644 hash = jhash_1word(0, mix);
645 else if (ipv6_addr_v4mapped(addr6))
646 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
647 else
648 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
649
650 return hash ^ port;
651}
652
653
654
655
656
657static inline bool ipv6_addr_orchid(const struct in6_addr *a)
658{
659 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
660}
661
662static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
663{
664 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
665}
666
667static inline void ipv6_addr_set_v4mapped(const __be32 addr,
668 struct in6_addr *v4mapped)
669{
670 ipv6_addr_set(v4mapped,
671 0, 0,
672 htonl(0x0000FFFF),
673 addr);
674}
675
676
677
678
679
680static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
681{
682 const __be32 *a1 = token1, *a2 = token2;
683 int i;
684
685 addrlen >>= 2;
686
687 for (i = 0; i < addrlen; i++) {
688 __be32 xb = a1[i] ^ a2[i];
689 if (xb)
690 return i * 32 + 31 - __fls(ntohl(xb));
691 }
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709 return addrlen << 5;
710}
711
712#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
713static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
714{
715 const __be64 *a1 = token1, *a2 = token2;
716 int i;
717
718 addrlen >>= 3;
719
720 for (i = 0; i < addrlen; i++) {
721 __be64 xb = a1[i] ^ a2[i];
722 if (xb)
723 return i * 64 + 63 - __fls(be64_to_cpu(xb));
724 }
725
726 return addrlen << 6;
727}
728#endif
729
730static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
731{
732#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
733 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
734 return __ipv6_addr_diff64(token1, token2, addrlen);
735#endif
736 return __ipv6_addr_diff32(token1, token2, addrlen);
737}
738
739static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
740{
741 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
742}
743
744__be32 ipv6_select_ident(struct net *net,
745 const struct in6_addr *daddr,
746 const struct in6_addr *saddr);
747__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
748
749int ip6_dst_hoplimit(struct dst_entry *dst);
750
751static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
752 struct dst_entry *dst)
753{
754 int hlimit;
755
756 if (ipv6_addr_is_multicast(&fl6->daddr))
757 hlimit = np->mcast_hops;
758 else
759 hlimit = np->hop_limit;
760 if (hlimit < 0)
761 hlimit = ip6_dst_hoplimit(dst);
762 return hlimit;
763}
764
765
766
767
768
769static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
770 const struct ipv6hdr *iph)
771{
772 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
773 offsetof(typeof(flow->addrs), v6addrs.src) +
774 sizeof(flow->addrs.v6addrs.src));
775 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
776 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
777}
778
779#if IS_ENABLED(CONFIG_IPV6)
780
781static inline bool ipv6_can_nonlocal_bind(struct net *net,
782 struct inet_sock *inet)
783{
784 return net->ipv6.sysctl.ip_nonlocal_bind ||
785 inet->freebind || inet->transparent;
786}
787
788
789#define IP6_AUTO_FLOW_LABEL_OFF 0
790#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
791#define IP6_AUTO_FLOW_LABEL_OPTIN 2
792#define IP6_AUTO_FLOW_LABEL_FORCED 3
793
794#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
795
796#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
797
798static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
799 __be32 flowlabel, bool autolabel,
800 struct flowi6 *fl6)
801{
802 u32 hash;
803
804
805
806
807 flowlabel &= IPV6_FLOWLABEL_MASK;
808
809 if (flowlabel ||
810 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
811 (!autolabel &&
812 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
813 return flowlabel;
814
815 hash = skb_get_hash_flowi6(skb, fl6);
816
817
818
819
820
821 hash = rol32(hash, 16);
822
823 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
824
825 if (net->ipv6.sysctl.flowlabel_state_ranges)
826 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
827
828 return flowlabel;
829}
830
831static inline int ip6_default_np_autolabel(struct net *net)
832{
833 switch (net->ipv6.sysctl.auto_flowlabels) {
834 case IP6_AUTO_FLOW_LABEL_OFF:
835 case IP6_AUTO_FLOW_LABEL_OPTIN:
836 default:
837 return 0;
838 case IP6_AUTO_FLOW_LABEL_OPTOUT:
839 case IP6_AUTO_FLOW_LABEL_FORCED:
840 return 1;
841 }
842}
843#else
844static inline void ip6_set_txhash(struct sock *sk) { }
845static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
846 __be32 flowlabel, bool autolabel,
847 struct flowi6 *fl6)
848{
849 return flowlabel;
850}
851static inline int ip6_default_np_autolabel(struct net *net)
852{
853 return 0;
854}
855#endif
856
857#if IS_ENABLED(CONFIG_IPV6)
858static inline int ip6_multipath_hash_policy(const struct net *net)
859{
860 return net->ipv6.sysctl.multipath_hash_policy;
861}
862#else
863static inline int ip6_multipath_hash_policy(const struct net *net)
864{
865 return 0;
866}
867#endif
868
869
870
871
872static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
873 __be32 flowlabel)
874{
875 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
876}
877
878static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
879{
880 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
881}
882
883static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
884{
885 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
886}
887
888static inline u8 ip6_tclass(__be32 flowinfo)
889{
890 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
891}
892
893static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
894{
895 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
896}
897
898static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
899{
900 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
901}
902
903
904
905
906
907
908
909
910
911int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
912 struct packet_type *pt, struct net_device *orig_dev);
913void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
914 struct net_device *orig_dev);
915
916int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
917
918
919
920
921int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
922 __u32 mark, struct ipv6_txoptions *opt, int tclass);
923
924int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
925
926int ip6_append_data(struct sock *sk,
927 int getfrag(void *from, char *to, int offset, int len,
928 int odd, struct sk_buff *skb),
929 void *from, int length, int transhdrlen,
930 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
931 struct rt6_info *rt, unsigned int flags);
932
933int ip6_push_pending_frames(struct sock *sk);
934
935void ip6_flush_pending_frames(struct sock *sk);
936
937int ip6_send_skb(struct sk_buff *skb);
938
939struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
940 struct inet_cork_full *cork,
941 struct inet6_cork *v6_cork);
942struct sk_buff *ip6_make_skb(struct sock *sk,
943 int getfrag(void *from, char *to, int offset,
944 int len, int odd, struct sk_buff *skb),
945 void *from, int length, int transhdrlen,
946 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
947 struct rt6_info *rt, unsigned int flags,
948 struct inet_cork_full *cork);
949
950static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
951{
952 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
953 &inet6_sk(sk)->cork);
954}
955
956int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
957 struct flowi6 *fl6);
958struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
959 const struct in6_addr *final_dst);
960struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
961 const struct in6_addr *final_dst,
962 bool connected);
963struct dst_entry *ip6_blackhole_route(struct net *net,
964 struct dst_entry *orig_dst);
965
966
967
968
969
970int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
971int ip6_forward(struct sk_buff *skb);
972int ip6_input(struct sk_buff *skb);
973int ip6_mc_input(struct sk_buff *skb);
974void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
975 bool have_final);
976
977int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
978int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
979
980
981
982
983
984void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
985 u8 *proto, struct in6_addr **daddr_p,
986 struct in6_addr *saddr);
987void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
988 u8 *proto);
989
990int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
991 __be16 *frag_offp);
992
993bool ipv6_ext_hdr(u8 nexthdr);
994
995enum {
996 IP6_FH_F_FRAG = (1 << 0),
997 IP6_FH_F_AUTH = (1 << 1),
998 IP6_FH_F_SKIP_RH = (1 << 2),
999};
1000
1001
1002int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1003 unsigned short *fragoff, int *fragflg);
1004
1005int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1006
1007struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1008 const struct ipv6_txoptions *opt,
1009 struct in6_addr *orig);
1010
1011
1012
1013
1014
1015int ipv6_setsockopt(struct sock *sk, int level, int optname,
1016 char __user *optval, unsigned int optlen);
1017int ipv6_getsockopt(struct sock *sk, int level, int optname,
1018 char __user *optval, int __user *optlen);
1019int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
1020 char __user *optval, unsigned int optlen);
1021int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1022 char __user *optval, int __user *optlen);
1023
1024int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1025 int addr_len);
1026int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1027int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1028 int addr_len);
1029int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1030void ip6_datagram_release_cb(struct sock *sk);
1031
1032int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1033 int *addr_len);
1034int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1035 int *addr_len);
1036void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1037 u32 info, u8 *payload);
1038void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1039void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1040
1041int inet6_release(struct socket *sock);
1042int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1043int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1044 int peer);
1045int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1046
1047int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1048 struct sock *sk);
1049
1050
1051
1052
1053extern const struct proto_ops inet6_stream_ops;
1054extern const struct proto_ops inet6_dgram_ops;
1055extern const struct proto_ops inet6_sockraw_ops;
1056
1057struct group_source_req;
1058struct group_filter;
1059
1060int ip6_mc_source(int add, int omode, struct sock *sk,
1061 struct group_source_req *pgsr);
1062int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1063int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1064 struct group_filter __user *optval, int __user *optlen);
1065
1066#ifdef CONFIG_PROC_FS
1067int ac6_proc_init(struct net *net);
1068void ac6_proc_exit(struct net *net);
1069int raw6_proc_init(void);
1070void raw6_proc_exit(void);
1071int tcp6_proc_init(struct net *net);
1072void tcp6_proc_exit(struct net *net);
1073int udp6_proc_init(struct net *net);
1074void udp6_proc_exit(struct net *net);
1075int udplite6_proc_init(void);
1076void udplite6_proc_exit(void);
1077int ipv6_misc_proc_init(void);
1078void ipv6_misc_proc_exit(void);
1079int snmp6_register_dev(struct inet6_dev *idev);
1080int snmp6_unregister_dev(struct inet6_dev *idev);
1081
1082#else
1083static inline int ac6_proc_init(struct net *net) { return 0; }
1084static inline void ac6_proc_exit(struct net *net) { }
1085static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1086static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1087#endif
1088
1089#ifdef CONFIG_SYSCTL
1090struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1091struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1092int ipv6_sysctl_register(void);
1093void ipv6_sysctl_unregister(void);
1094#endif
1095
1096int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1097 const struct in6_addr *addr);
1098int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1099 const struct in6_addr *addr, unsigned int mode);
1100int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1101 const struct in6_addr *addr);
1102#endif
1103