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1/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
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 <net/if_inet6.h>
20#include <net/ndisc.h>
21#include <net/flow.h>
22#include <net/snmp.h>
23
24#define SIN6_LEN_RFC2133 24
25
26#define IPV6_MAXPLEN 65535
27
28/*
29 * NextHeader field of IPv6 header
30 */
31
32#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
33#define NEXTHDR_TCP 6 /* TCP segment. */
34#define NEXTHDR_UDP 17 /* UDP message. */
35#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
36#define NEXTHDR_ROUTING 43 /* Routing header. */
37#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
38#define NEXTHDR_GRE 47 /* GRE header. */
39#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
40#define NEXTHDR_AUTH 51 /* Authentication header. */
41#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
42#define NEXTHDR_NONE 59 /* No next header */
43#define NEXTHDR_DEST 60 /* Destination options header. */
44#define NEXTHDR_SCTP 132 /* SCTP message. */
45#define NEXTHDR_MOBILITY 135 /* Mobility header. */
46
47#define NEXTHDR_MAX 255
48
49
50
51#define IPV6_DEFAULT_HOPLIMIT 64
52#define IPV6_DEFAULT_MCASTHOPS 1
53
54/*
55 * Addr type
56 *
57 * type - unicast | multicast
58 * scope - local | site | global
59 * v4 - compat
60 * v4mapped
61 * any
62 * loopback
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 * Addr scopes
82 */
83#define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
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 * Addr flags
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 * fragmentation header
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#include <net/sock.h>
117
118/* sysctls */
119extern int sysctl_mld_max_msf;
120
121#define _DEVINC(net, statname, modifier, idev, field) \
122({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
126 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
127})
128
129/* per device counters are atomic_long_t */
130#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
131({ \
132 struct inet6_dev *_idev = (idev); \
133 if (likely(_idev != NULL)) \
134 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
135 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
136})
137
138/* per device and per net counters are atomic_long_t */
139#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
140({ \
141 struct inet6_dev *_idev = (idev); \
142 if (likely(_idev != NULL)) \
143 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
144 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
145})
146
147#define _DEVADD(net, statname, modifier, idev, field, val) \
148({ \
149 struct inet6_dev *_idev = (idev); \
150 if (likely(_idev != NULL)) \
151 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
152 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
153})
154
155#define _DEVUPD(net, statname, modifier, idev, field, val) \
156({ \
157 struct inet6_dev *_idev = (idev); \
158 if (likely(_idev != NULL)) \
159 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
160 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
161})
162
163/* MIBs */
164
165#define IP6_INC_STATS(net, idev,field) \
166 _DEVINC(net, ipv6, 64, idev, field)
167#define IP6_INC_STATS_BH(net, idev,field) \
168 _DEVINC(net, ipv6, 64_BH, idev, field)
169#define IP6_ADD_STATS(net, idev,field,val) \
170 _DEVADD(net, ipv6, 64, idev, field, val)
171#define IP6_ADD_STATS_BH(net, idev,field,val) \
172 _DEVADD(net, ipv6, 64_BH, idev, field, val)
173#define IP6_UPD_PO_STATS(net, idev,field,val) \
174 _DEVUPD(net, ipv6, 64, idev, field, val)
175#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
176 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
177#define ICMP6_INC_STATS(net, idev, field) \
178 _DEVINCATOMIC(net, icmpv6, , idev, field)
179#define ICMP6_INC_STATS_BH(net, idev, field) \
180 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
181
182#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
184#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
185 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
186#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
188
189struct ip6_ra_chain {
190 struct ip6_ra_chain *next;
191 struct sock *sk;
192 int sel;
193 void (*destructor)(struct sock *);
194};
195
196extern struct ip6_ra_chain *ip6_ra_chain;
197extern rwlock_t ip6_ra_lock;
198
199/*
200 This structure is prepared by protocol, when parsing
201 ancillary data and passed to IPv6.
202 */
203
204struct ipv6_txoptions {
205 /* Length of this structure */
206 int tot_len;
207
208 /* length of extension headers */
209
210 __u16 opt_flen; /* after fragment hdr */
211 __u16 opt_nflen; /* before fragment hdr */
212
213 struct ipv6_opt_hdr *hopopt;
214 struct ipv6_opt_hdr *dst0opt;
215 struct ipv6_rt_hdr *srcrt; /* Routing Header */
216 struct ipv6_opt_hdr *dst1opt;
217
218 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
219};
220
221struct ip6_flowlabel {
222 struct ip6_flowlabel __rcu *next;
223 __be32 label;
224 atomic_t users;
225 struct in6_addr dst;
226 struct ipv6_txoptions *opt;
227 unsigned long linger;
228 struct rcu_head rcu;
229 u8 share;
230 union {
231 struct pid *pid;
232 kuid_t uid;
233 } owner;
234 unsigned long lastuse;
235 unsigned long expires;
236 struct net *fl_net;
237};
238
239#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
240#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
241#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
242#define IPV6_TCLASS_SHIFT 20
243
244struct ipv6_fl_socklist {
245 struct ipv6_fl_socklist __rcu *next;
246 struct ip6_flowlabel *fl;
247 struct rcu_head rcu;
248};
249
250struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
251struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
252 struct ip6_flowlabel *fl,
253 struct ipv6_txoptions *fopt);
254void fl6_free_socklist(struct sock *sk);
255int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
256int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
257 int flags);
258int ip6_flowlabel_init(void);
259void ip6_flowlabel_cleanup(void);
260
261static inline void fl6_sock_release(struct ip6_flowlabel *fl)
262{
263 if (fl)
264 atomic_dec(&fl->users);
265}
266
267void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
268
269int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
270 struct icmp6hdr *thdr, int len);
271
272int ip6_ra_control(struct sock *sk, int sel);
273
274int ipv6_parse_hopopts(struct sk_buff *skb);
275
276struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
277 struct ipv6_txoptions *opt);
278struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
279 struct ipv6_txoptions *opt,
280 int newtype,
281 struct ipv6_opt_hdr __user *newopt,
282 int newoptlen);
283struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
284 struct ipv6_txoptions *opt);
285
286bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
287
288static inline bool ipv6_accept_ra(struct inet6_dev *idev)
289{
290 /* If forwarding is enabled, RA are not accepted unless the special
291 * hybrid mode (accept_ra=2) is enabled.
292 */
293 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
294 idev->cnf.accept_ra;
295}
296
297#if IS_ENABLED(CONFIG_IPV6)
298static inline int ip6_frag_nqueues(struct net *net)
299{
300 return net->ipv6.frags.nqueues;
301}
302
303static inline int ip6_frag_mem(struct net *net)
304{
305 return sum_frag_mem_limit(&net->ipv6.frags);
306}
307#endif
308
309#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
310#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
311#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
312
313int __ipv6_addr_type(const struct in6_addr *addr);
314static inline int ipv6_addr_type(const struct in6_addr *addr)
315{
316 return __ipv6_addr_type(addr) & 0xffff;
317}
318
319static inline int ipv6_addr_scope(const struct in6_addr *addr)
320{
321 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
322}
323
324static inline int __ipv6_addr_src_scope(int type)
325{
326 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
327}
328
329static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
330{
331 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
332}
333
334static inline bool __ipv6_addr_needs_scope_id(int type)
335{
336 return type & IPV6_ADDR_LINKLOCAL ||
337 (type & IPV6_ADDR_MULTICAST &&
338 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
339}
340
341static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
342{
343 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
344}
345
346static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
347{
348 return memcmp(a1, a2, sizeof(struct in6_addr));
349}
350
351static inline bool
352ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
353 const struct in6_addr *a2)
354{
355#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
356 const unsigned long *ul1 = (const unsigned long *)a1;
357 const unsigned long *ulm = (const unsigned long *)m;
358 const unsigned long *ul2 = (const unsigned long *)a2;
359
360 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
361 ((ul1[1] ^ ul2[1]) & ulm[1]));
362#else
363 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
364 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
365 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
366 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
367#endif
368}
369
370static inline void ipv6_addr_prefix(struct in6_addr *pfx,
371 const struct in6_addr *addr,
372 int plen)
373{
374 /* caller must guarantee 0 <= plen <= 128 */
375 int o = plen >> 3,
376 b = plen & 0x7;
377
378 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
379 memcpy(pfx->s6_addr, addr, o);
380 if (b != 0)
381 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
382}
383
384static inline void __ipv6_addr_set_half(__be32 *addr,
385 __be32 wh, __be32 wl)
386{
387#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
388#if defined(__BIG_ENDIAN)
389 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
390 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
391 return;
392 }
393#elif defined(__LITTLE_ENDIAN)
394 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
395 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
396 return;
397 }
398#endif
399#endif
400 addr[0] = wh;
401 addr[1] = wl;
402}
403
404static inline void ipv6_addr_set(struct in6_addr *addr,
405 __be32 w1, __be32 w2,
406 __be32 w3, __be32 w4)
407{
408 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
409 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
410}
411
412static inline bool ipv6_addr_equal(const struct in6_addr *a1,
413 const struct in6_addr *a2)
414{
415#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
416 const unsigned long *ul1 = (const unsigned long *)a1;
417 const unsigned long *ul2 = (const unsigned long *)a2;
418
419 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
420#else
421 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
422 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
423 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
424 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
425#endif
426}
427
428#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
429static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
430 const __be64 *a2,
431 unsigned int len)
432{
433 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
434 return false;
435 return true;
436}
437
438static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
439 const struct in6_addr *addr2,
440 unsigned int prefixlen)
441{
442 const __be64 *a1 = (const __be64 *)addr1;
443 const __be64 *a2 = (const __be64 *)addr2;
444
445 if (prefixlen >= 64) {
446 if (a1[0] ^ a2[0])
447 return false;
448 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
449 }
450 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
451}
452#else
453static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
454 const struct in6_addr *addr2,
455 unsigned int prefixlen)
456{
457 const __be32 *a1 = addr1->s6_addr32;
458 const __be32 *a2 = addr2->s6_addr32;
459 unsigned int pdw, pbi;
460
461 /* check complete u32 in prefix */
462 pdw = prefixlen >> 5;
463 if (pdw && memcmp(a1, a2, pdw << 2))
464 return false;
465
466 /* check incomplete u32 in prefix */
467 pbi = prefixlen & 0x1f;
468 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
469 return false;
470
471 return true;
472}
473#endif
474
475struct inet_frag_queue;
476
477enum ip6_defrag_users {
478 IP6_DEFRAG_LOCAL_DELIVER,
479 IP6_DEFRAG_CONNTRACK_IN,
480 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
481 IP6_DEFRAG_CONNTRACK_OUT,
482 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
483 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
484 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
485};
486
487struct ip6_create_arg {
488 __be32 id;
489 u32 user;
490 const struct in6_addr *src;
491 const struct in6_addr *dst;
492 u8 ecn;
493};
494
495void ip6_frag_init(struct inet_frag_queue *q, void *a);
496bool ip6_frag_match(struct inet_frag_queue *q, void *a);
497
498/*
499 * Equivalent of ipv4 struct ip
500 */
501struct frag_queue {
502 struct inet_frag_queue q;
503
504 __be32 id; /* fragment id */
505 u32 user;
506 struct in6_addr saddr;
507 struct in6_addr daddr;
508
509 int iif;
510 unsigned int csum;
511 __u16 nhoffset;
512 u8 ecn;
513};
514
515void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
516 struct inet_frags *frags);
517
518static inline bool ipv6_addr_any(const struct in6_addr *a)
519{
520#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
521 const unsigned long *ul = (const unsigned long *)a;
522
523 return (ul[0] | ul[1]) == 0UL;
524#else
525 return (a->s6_addr32[0] | a->s6_addr32[1] |
526 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
527#endif
528}
529
530static inline u32 ipv6_addr_hash(const struct in6_addr *a)
531{
532#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
533 const unsigned long *ul = (const unsigned long *)a;
534 unsigned long x = ul[0] ^ ul[1];
535
536 return (u32)(x ^ (x >> 32));
537#else
538 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
539 a->s6_addr32[2] ^ a->s6_addr32[3]);
540#endif
541}
542
543/* more secured version of ipv6_addr_hash() */
544static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
545{
546 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
547
548 return jhash_3words(v,
549 (__force u32)a->s6_addr32[2],
550 (__force u32)a->s6_addr32[3],
551 initval);
552}
553
554static inline bool ipv6_addr_loopback(const struct in6_addr *a)
555{
556#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
557 const unsigned long *ul = (const unsigned long *)a;
558
559 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
560#else
561 return (a->s6_addr32[0] | a->s6_addr32[1] |
562 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
563#endif
564}
565
566static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
567{
568 return (
569#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
570 *(__be64 *)a |
571#else
572 (a->s6_addr32[0] | a->s6_addr32[1]) |
573#endif
574 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
575}
576
577/*
578 * Check for a RFC 4843 ORCHID address
579 * (Overlay Routable Cryptographic Hash Identifiers)
580 */
581static inline bool ipv6_addr_orchid(const struct in6_addr *a)
582{
583 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
584}
585
586static inline void ipv6_addr_set_v4mapped(const __be32 addr,
587 struct in6_addr *v4mapped)
588{
589 ipv6_addr_set(v4mapped,
590 0, 0,
591 htonl(0x0000FFFF),
592 addr);
593}
594
595/*
596 * find the first different bit between two addresses
597 * length of address must be a multiple of 32bits
598 */
599static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
600{
601 const __be32 *a1 = token1, *a2 = token2;
602 int i;
603
604 addrlen >>= 2;
605
606 for (i = 0; i < addrlen; i++) {
607 __be32 xb = a1[i] ^ a2[i];
608 if (xb)
609 return i * 32 + 31 - __fls(ntohl(xb));
610 }
611
612 /*
613 * we should *never* get to this point since that
614 * would mean the addrs are equal
615 *
616 * However, we do get to it 8) And exacly, when
617 * addresses are equal 8)
618 *
619 * ip route add 1111::/128 via ...
620 * ip route add 1111::/64 via ...
621 * and we are here.
622 *
623 * Ideally, this function should stop comparison
624 * at prefix length. It does not, but it is still OK,
625 * if returned value is greater than prefix length.
626 * --ANK (980803)
627 */
628 return addrlen << 5;
629}
630
631#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
632static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
633{
634 const __be64 *a1 = token1, *a2 = token2;
635 int i;
636
637 addrlen >>= 3;
638
639 for (i = 0; i < addrlen; i++) {
640 __be64 xb = a1[i] ^ a2[i];
641 if (xb)
642 return i * 64 + 63 - __fls(be64_to_cpu(xb));
643 }
644
645 return addrlen << 6;
646}
647#endif
648
649static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
650{
651#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
652 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
653 return __ipv6_addr_diff64(token1, token2, addrlen);
654#endif
655 return __ipv6_addr_diff32(token1, token2, addrlen);
656}
657
658static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
659{
660 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
661}
662
663void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
664
665int ip6_dst_hoplimit(struct dst_entry *dst);
666
667/*
668 * Header manipulation
669 */
670static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
671 __be32 flowlabel)
672{
673 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
674}
675
676static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
677{
678 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
679}
680
681static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
682{
683 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
684}
685
686static inline u8 ip6_tclass(__be32 flowinfo)
687{
688 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
689}
690/*
691 * Prototypes exported by ipv6
692 */
693
694/*
695 * rcv function (called from netdevice level)
696 */
697
698int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
699 struct packet_type *pt, struct net_device *orig_dev);
700
701int ip6_rcv_finish(struct sk_buff *skb);
702
703/*
704 * upper-layer output functions
705 */
706int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
707 struct ipv6_txoptions *opt, int tclass);
708
709int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
710
711int ip6_append_data(struct sock *sk,
712 int getfrag(void *from, char *to, int offset, int len,
713 int odd, struct sk_buff *skb),
714 void *from, int length, int transhdrlen, int hlimit,
715 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
716 struct rt6_info *rt, unsigned int flags, int dontfrag);
717
718int ip6_push_pending_frames(struct sock *sk);
719
720void ip6_flush_pending_frames(struct sock *sk);
721
722int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
723struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
724 const struct in6_addr *final_dst);
725struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
726 const struct in6_addr *final_dst);
727struct dst_entry *ip6_blackhole_route(struct net *net,
728 struct dst_entry *orig_dst);
729
730/*
731 * skb processing functions
732 */
733
734int ip6_output(struct sock *sk, struct sk_buff *skb);
735int ip6_forward(struct sk_buff *skb);
736int ip6_input(struct sk_buff *skb);
737int ip6_mc_input(struct sk_buff *skb);
738
739int __ip6_local_out(struct sk_buff *skb);
740int ip6_local_out(struct sk_buff *skb);
741
742/*
743 * Extension header (options) processing
744 */
745
746void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
747 u8 *proto, struct in6_addr **daddr_p);
748void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
749 u8 *proto);
750
751int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
752 __be16 *frag_offp);
753
754bool ipv6_ext_hdr(u8 nexthdr);
755
756enum {
757 IP6_FH_F_FRAG = (1 << 0),
758 IP6_FH_F_AUTH = (1 << 1),
759 IP6_FH_F_SKIP_RH = (1 << 2),
760};
761
762/* find specified header and get offset to it */
763int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
764 unsigned short *fragoff, int *fragflg);
765
766int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
767
768struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
769 const struct ipv6_txoptions *opt,
770 struct in6_addr *orig);
771
772/*
773 * socket options (ipv6_sockglue.c)
774 */
775
776int ipv6_setsockopt(struct sock *sk, int level, int optname,
777 char __user *optval, unsigned int optlen);
778int ipv6_getsockopt(struct sock *sk, int level, int optname,
779 char __user *optval, int __user *optlen);
780int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
781 char __user *optval, unsigned int optlen);
782int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
783 char __user *optval, int __user *optlen);
784
785int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
786int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
787 int addr_len);
788
789int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
790 int *addr_len);
791int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
792 int *addr_len);
793void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
794 u32 info, u8 *payload);
795void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
796void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
797
798int inet6_release(struct socket *sock);
799int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
800int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
801 int peer);
802int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
803
804int inet6_hash_connect(struct inet_timewait_death_row *death_row,
805 struct sock *sk);
806
807/*
808 * reassembly.c
809 */
810extern const struct proto_ops inet6_stream_ops;
811extern const struct proto_ops inet6_dgram_ops;
812
813struct group_source_req;
814struct group_filter;
815
816int ip6_mc_source(int add, int omode, struct sock *sk,
817 struct group_source_req *pgsr);
818int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
819int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
820 struct group_filter __user *optval, int __user *optlen);
821
822#ifdef CONFIG_PROC_FS
823int ac6_proc_init(struct net *net);
824void ac6_proc_exit(struct net *net);
825int raw6_proc_init(void);
826void raw6_proc_exit(void);
827int tcp6_proc_init(struct net *net);
828void tcp6_proc_exit(struct net *net);
829int udp6_proc_init(struct net *net);
830void udp6_proc_exit(struct net *net);
831int udplite6_proc_init(void);
832void udplite6_proc_exit(void);
833int ipv6_misc_proc_init(void);
834void ipv6_misc_proc_exit(void);
835int snmp6_register_dev(struct inet6_dev *idev);
836int snmp6_unregister_dev(struct inet6_dev *idev);
837
838#else
839static inline int ac6_proc_init(struct net *net) { return 0; }
840static inline void ac6_proc_exit(struct net *net) { }
841static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
842static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
843#endif
844
845#ifdef CONFIG_SYSCTL
846extern struct ctl_table ipv6_route_table_template[];
847
848struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
849struct ctl_table *ipv6_route_sysctl_init(struct net *net);
850int ipv6_sysctl_register(void);
851void ipv6_sysctl_unregister(void);
852#endif
853
854#endif /* _NET_IPV6_H */
1/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
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 <net/if_inet6.h>
20#include <net/ndisc.h>
21#include <net/flow.h>
22#include <net/flow_dissector.h>
23#include <net/snmp.h>
24
25#define SIN6_LEN_RFC2133 24
26
27#define IPV6_MAXPLEN 65535
28
29/*
30 * NextHeader field of IPv6 header
31 */
32
33#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
34#define NEXTHDR_TCP 6 /* TCP segment. */
35#define NEXTHDR_UDP 17 /* UDP message. */
36#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
37#define NEXTHDR_ROUTING 43 /* Routing header. */
38#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
39#define NEXTHDR_GRE 47 /* GRE header. */
40#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
41#define NEXTHDR_AUTH 51 /* Authentication header. */
42#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
43#define NEXTHDR_NONE 59 /* No next header */
44#define NEXTHDR_DEST 60 /* Destination options header. */
45#define NEXTHDR_SCTP 132 /* SCTP message. */
46#define NEXTHDR_MOBILITY 135 /* Mobility header. */
47
48#define NEXTHDR_MAX 255
49
50#define IPV6_DEFAULT_HOPLIMIT 64
51#define IPV6_DEFAULT_MCASTHOPS 1
52
53/*
54 * Addr type
55 *
56 * type - unicast | multicast
57 * scope - local | site | global
58 * v4 - compat
59 * v4mapped
60 * any
61 * loopback
62 */
63
64#define IPV6_ADDR_ANY 0x0000U
65
66#define IPV6_ADDR_UNICAST 0x0001U
67#define IPV6_ADDR_MULTICAST 0x0002U
68
69#define IPV6_ADDR_LOOPBACK 0x0010U
70#define IPV6_ADDR_LINKLOCAL 0x0020U
71#define IPV6_ADDR_SITELOCAL 0x0040U
72
73#define IPV6_ADDR_COMPATv4 0x0080U
74
75#define IPV6_ADDR_SCOPE_MASK 0x00f0U
76
77#define IPV6_ADDR_MAPPED 0x1000U
78
79/*
80 * Addr scopes
81 */
82#define IPV6_ADDR_MC_SCOPE(a) \
83 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
84#define __IPV6_ADDR_SCOPE_INVALID -1
85#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
86#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
87#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
88#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
89#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
90
91/*
92 * Addr flags
93 */
94#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
95 ((a)->s6_addr[1] & 0x10)
96#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
97 ((a)->s6_addr[1] & 0x20)
98#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
99 ((a)->s6_addr[1] & 0x40)
100
101/*
102 * fragmentation header
103 */
104
105struct frag_hdr {
106 __u8 nexthdr;
107 __u8 reserved;
108 __be16 frag_off;
109 __be32 identification;
110};
111
112#define IP6_MF 0x0001
113#define IP6_OFFSET 0xFFF8
114
115#define IP6_REPLY_MARK(net, mark) \
116 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117
118#include <net/sock.h>
119
120/* sysctls */
121extern int sysctl_mld_max_msf;
122extern int sysctl_mld_qrv;
123
124#define _DEVINC(net, statname, modifier, idev, field) \
125({ \
126 struct inet6_dev *_idev = (idev); \
127 if (likely(_idev != NULL)) \
128 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
129 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
130})
131
132/* per device counters are atomic_long_t */
133#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
134({ \
135 struct inet6_dev *_idev = (idev); \
136 if (likely(_idev != NULL)) \
137 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
139})
140
141/* per device and per net counters are atomic_long_t */
142#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
143({ \
144 struct inet6_dev *_idev = (idev); \
145 if (likely(_idev != NULL)) \
146 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148})
149
150#define _DEVADD(net, statname, modifier, idev, field, val) \
151({ \
152 struct inet6_dev *_idev = (idev); \
153 if (likely(_idev != NULL)) \
154 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
155 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
156})
157
158#define _DEVUPD(net, statname, modifier, idev, field, val) \
159({ \
160 struct inet6_dev *_idev = (idev); \
161 if (likely(_idev != NULL)) \
162 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
163 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
164})
165
166/* MIBs */
167
168#define IP6_INC_STATS(net, idev,field) \
169 _DEVINC(net, ipv6, 64, idev, field)
170#define IP6_INC_STATS_BH(net, idev,field) \
171 _DEVINC(net, ipv6, 64_BH, idev, field)
172#define IP6_ADD_STATS(net, idev,field,val) \
173 _DEVADD(net, ipv6, 64, idev, field, val)
174#define IP6_ADD_STATS_BH(net, idev,field,val) \
175 _DEVADD(net, ipv6, 64_BH, idev, field, val)
176#define IP6_UPD_PO_STATS(net, idev,field,val) \
177 _DEVUPD(net, ipv6, 64, idev, field, val)
178#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
179 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
180#define ICMP6_INC_STATS(net, idev, field) \
181 _DEVINCATOMIC(net, icmpv6, , idev, field)
182#define ICMP6_INC_STATS_BH(net, idev, field) \
183 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
184
185#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
186 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
188 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
189#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
190 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
191
192struct ip6_ra_chain {
193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197};
198
199extern struct ip6_ra_chain *ip6_ra_chain;
200extern rwlock_t ip6_ra_lock;
201
202/*
203 This structure is prepared by protocol, when parsing
204 ancillary data and passed to IPv6.
205 */
206
207struct ipv6_txoptions {
208 atomic_t refcnt;
209 /* Length of this structure */
210 int tot_len;
211
212 /* length of extension headers */
213
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
216
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
220 struct ipv6_opt_hdr *dst1opt;
221 struct rcu_head rcu;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223};
224
225struct ip6_flowlabel {
226 struct ip6_flowlabel __rcu *next;
227 __be32 label;
228 atomic_t users;
229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
231 unsigned long linger;
232 struct rcu_head rcu;
233 u8 share;
234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
238 unsigned long lastuse;
239 unsigned long expires;
240 struct net *fl_net;
241};
242
243#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
246
247#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
248#define IPV6_TCLASS_SHIFT 20
249
250struct ipv6_fl_socklist {
251 struct ipv6_fl_socklist __rcu *next;
252 struct ip6_flowlabel *fl;
253 struct rcu_head rcu;
254};
255
256static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
257{
258 struct ipv6_txoptions *opt;
259
260 rcu_read_lock();
261 opt = rcu_dereference(np->opt);
262 if (opt) {
263 if (!atomic_inc_not_zero(&opt->refcnt))
264 opt = NULL;
265 else
266 opt = rcu_pointer_handoff(opt);
267 }
268 rcu_read_unlock();
269 return opt;
270}
271
272static inline void txopt_put(struct ipv6_txoptions *opt)
273{
274 if (opt && atomic_dec_and_test(&opt->refcnt))
275 kfree_rcu(opt, rcu);
276}
277
278struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
279struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
280 struct ip6_flowlabel *fl,
281 struct ipv6_txoptions *fopt);
282void fl6_free_socklist(struct sock *sk);
283int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
284int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
285 int flags);
286int ip6_flowlabel_init(void);
287void ip6_flowlabel_cleanup(void);
288
289static inline void fl6_sock_release(struct ip6_flowlabel *fl)
290{
291 if (fl)
292 atomic_dec(&fl->users);
293}
294
295void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
296
297int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
298 struct icmp6hdr *thdr, int len);
299
300int ip6_ra_control(struct sock *sk, int sel);
301
302int ipv6_parse_hopopts(struct sk_buff *skb);
303
304struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
305 struct ipv6_txoptions *opt);
306struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
307 struct ipv6_txoptions *opt,
308 int newtype,
309 struct ipv6_opt_hdr __user *newopt,
310 int newoptlen);
311struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
312 struct ipv6_txoptions *opt);
313
314bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
315 const struct inet6_skb_parm *opt);
316
317static inline bool ipv6_accept_ra(struct inet6_dev *idev)
318{
319 /* If forwarding is enabled, RA are not accepted unless the special
320 * hybrid mode (accept_ra=2) is enabled.
321 */
322 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
323 idev->cnf.accept_ra;
324}
325
326#if IS_ENABLED(CONFIG_IPV6)
327static inline int ip6_frag_mem(struct net *net)
328{
329 return sum_frag_mem_limit(&net->ipv6.frags);
330}
331#endif
332
333#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
334#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
335#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
336
337int __ipv6_addr_type(const struct in6_addr *addr);
338static inline int ipv6_addr_type(const struct in6_addr *addr)
339{
340 return __ipv6_addr_type(addr) & 0xffff;
341}
342
343static inline int ipv6_addr_scope(const struct in6_addr *addr)
344{
345 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
346}
347
348static inline int __ipv6_addr_src_scope(int type)
349{
350 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
351}
352
353static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
354{
355 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
356}
357
358static inline bool __ipv6_addr_needs_scope_id(int type)
359{
360 return type & IPV6_ADDR_LINKLOCAL ||
361 (type & IPV6_ADDR_MULTICAST &&
362 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
363}
364
365static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
366{
367 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
368}
369
370static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
371{
372 return memcmp(a1, a2, sizeof(struct in6_addr));
373}
374
375static inline bool
376ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
377 const struct in6_addr *a2)
378{
379#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
380 const unsigned long *ul1 = (const unsigned long *)a1;
381 const unsigned long *ulm = (const unsigned long *)m;
382 const unsigned long *ul2 = (const unsigned long *)a2;
383
384 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
385 ((ul1[1] ^ ul2[1]) & ulm[1]));
386#else
387 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
388 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
389 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
390 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
391#endif
392}
393
394static inline void ipv6_addr_prefix(struct in6_addr *pfx,
395 const struct in6_addr *addr,
396 int plen)
397{
398 /* caller must guarantee 0 <= plen <= 128 */
399 int o = plen >> 3,
400 b = plen & 0x7;
401
402 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
403 memcpy(pfx->s6_addr, addr, o);
404 if (b != 0)
405 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
406}
407
408static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
409 const struct in6_addr *pfx,
410 int plen)
411{
412 /* caller must guarantee 0 <= plen <= 128 */
413 int o = plen >> 3,
414 b = plen & 0x7;
415
416 memcpy(addr->s6_addr, pfx, o);
417 if (b != 0) {
418 addr->s6_addr[o] &= ~(0xff00 >> b);
419 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
420 }
421}
422
423static inline void __ipv6_addr_set_half(__be32 *addr,
424 __be32 wh, __be32 wl)
425{
426#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427#if defined(__BIG_ENDIAN)
428 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
429 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
430 return;
431 }
432#elif defined(__LITTLE_ENDIAN)
433 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
434 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
435 return;
436 }
437#endif
438#endif
439 addr[0] = wh;
440 addr[1] = wl;
441}
442
443static inline void ipv6_addr_set(struct in6_addr *addr,
444 __be32 w1, __be32 w2,
445 __be32 w3, __be32 w4)
446{
447 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
448 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
449}
450
451static inline bool ipv6_addr_equal(const struct in6_addr *a1,
452 const struct in6_addr *a2)
453{
454#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
455 const unsigned long *ul1 = (const unsigned long *)a1;
456 const unsigned long *ul2 = (const unsigned long *)a2;
457
458 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
459#else
460 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
461 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
462 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
463 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
464#endif
465}
466
467#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
469 const __be64 *a2,
470 unsigned int len)
471{
472 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
473 return false;
474 return true;
475}
476
477static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
478 const struct in6_addr *addr2,
479 unsigned int prefixlen)
480{
481 const __be64 *a1 = (const __be64 *)addr1;
482 const __be64 *a2 = (const __be64 *)addr2;
483
484 if (prefixlen >= 64) {
485 if (a1[0] ^ a2[0])
486 return false;
487 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
488 }
489 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
490}
491#else
492static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
493 const struct in6_addr *addr2,
494 unsigned int prefixlen)
495{
496 const __be32 *a1 = addr1->s6_addr32;
497 const __be32 *a2 = addr2->s6_addr32;
498 unsigned int pdw, pbi;
499
500 /* check complete u32 in prefix */
501 pdw = prefixlen >> 5;
502 if (pdw && memcmp(a1, a2, pdw << 2))
503 return false;
504
505 /* check incomplete u32 in prefix */
506 pbi = prefixlen & 0x1f;
507 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
508 return false;
509
510 return true;
511}
512#endif
513
514struct inet_frag_queue;
515
516enum ip6_defrag_users {
517 IP6_DEFRAG_LOCAL_DELIVER,
518 IP6_DEFRAG_CONNTRACK_IN,
519 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
520 IP6_DEFRAG_CONNTRACK_OUT,
521 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
522 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
523 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
524};
525
526struct ip6_create_arg {
527 __be32 id;
528 u32 user;
529 const struct in6_addr *src;
530 const struct in6_addr *dst;
531 int iif;
532 u8 ecn;
533};
534
535void ip6_frag_init(struct inet_frag_queue *q, const void *a);
536bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
537
538/*
539 * Equivalent of ipv4 struct ip
540 */
541struct frag_queue {
542 struct inet_frag_queue q;
543
544 __be32 id; /* fragment id */
545 u32 user;
546 struct in6_addr saddr;
547 struct in6_addr daddr;
548
549 int iif;
550 unsigned int csum;
551 __u16 nhoffset;
552 u8 ecn;
553};
554
555void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
556 struct inet_frags *frags);
557
558static inline bool ipv6_addr_any(const struct in6_addr *a)
559{
560#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
561 const unsigned long *ul = (const unsigned long *)a;
562
563 return (ul[0] | ul[1]) == 0UL;
564#else
565 return (a->s6_addr32[0] | a->s6_addr32[1] |
566 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
567#endif
568}
569
570static inline u32 ipv6_addr_hash(const struct in6_addr *a)
571{
572#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
573 const unsigned long *ul = (const unsigned long *)a;
574 unsigned long x = ul[0] ^ ul[1];
575
576 return (u32)(x ^ (x >> 32));
577#else
578 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
579 a->s6_addr32[2] ^ a->s6_addr32[3]);
580#endif
581}
582
583/* more secured version of ipv6_addr_hash() */
584static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
585{
586 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
587
588 return jhash_3words(v,
589 (__force u32)a->s6_addr32[2],
590 (__force u32)a->s6_addr32[3],
591 initval);
592}
593
594static inline bool ipv6_addr_loopback(const struct in6_addr *a)
595{
596#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
597 const __be64 *be = (const __be64 *)a;
598
599 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
600#else
601 return (a->s6_addr32[0] | a->s6_addr32[1] |
602 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
603#endif
604}
605
606/*
607 * Note that we must __force cast these to unsigned long to make sparse happy,
608 * since all of the endian-annotated types are fixed size regardless of arch.
609 */
610static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
611{
612 return (
613#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
614 *(unsigned long *)a |
615#else
616 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
617#endif
618 (__force unsigned long)(a->s6_addr32[2] ^
619 cpu_to_be32(0x0000ffff))) == 0UL;
620}
621
622/*
623 * Check for a RFC 4843 ORCHID address
624 * (Overlay Routable Cryptographic Hash Identifiers)
625 */
626static inline bool ipv6_addr_orchid(const struct in6_addr *a)
627{
628 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
629}
630
631static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
632{
633 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
634}
635
636static inline void ipv6_addr_set_v4mapped(const __be32 addr,
637 struct in6_addr *v4mapped)
638{
639 ipv6_addr_set(v4mapped,
640 0, 0,
641 htonl(0x0000FFFF),
642 addr);
643}
644
645/*
646 * find the first different bit between two addresses
647 * length of address must be a multiple of 32bits
648 */
649static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
650{
651 const __be32 *a1 = token1, *a2 = token2;
652 int i;
653
654 addrlen >>= 2;
655
656 for (i = 0; i < addrlen; i++) {
657 __be32 xb = a1[i] ^ a2[i];
658 if (xb)
659 return i * 32 + 31 - __fls(ntohl(xb));
660 }
661
662 /*
663 * we should *never* get to this point since that
664 * would mean the addrs are equal
665 *
666 * However, we do get to it 8) And exacly, when
667 * addresses are equal 8)
668 *
669 * ip route add 1111::/128 via ...
670 * ip route add 1111::/64 via ...
671 * and we are here.
672 *
673 * Ideally, this function should stop comparison
674 * at prefix length. It does not, but it is still OK,
675 * if returned value is greater than prefix length.
676 * --ANK (980803)
677 */
678 return addrlen << 5;
679}
680
681#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
682static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
683{
684 const __be64 *a1 = token1, *a2 = token2;
685 int i;
686
687 addrlen >>= 3;
688
689 for (i = 0; i < addrlen; i++) {
690 __be64 xb = a1[i] ^ a2[i];
691 if (xb)
692 return i * 64 + 63 - __fls(be64_to_cpu(xb));
693 }
694
695 return addrlen << 6;
696}
697#endif
698
699static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
700{
701#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
702 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
703 return __ipv6_addr_diff64(token1, token2, addrlen);
704#endif
705 return __ipv6_addr_diff32(token1, token2, addrlen);
706}
707
708static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
709{
710 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
711}
712
713__be32 ipv6_select_ident(struct net *net,
714 const struct in6_addr *daddr,
715 const struct in6_addr *saddr);
716void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
717
718int ip6_dst_hoplimit(struct dst_entry *dst);
719
720static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
721 struct dst_entry *dst)
722{
723 int hlimit;
724
725 if (ipv6_addr_is_multicast(&fl6->daddr))
726 hlimit = np->mcast_hops;
727 else
728 hlimit = np->hop_limit;
729 if (hlimit < 0)
730 hlimit = ip6_dst_hoplimit(dst);
731 return hlimit;
732}
733
734/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
735 * Equivalent to : flow->v6addrs.src = iph->saddr;
736 * flow->v6addrs.dst = iph->daddr;
737 */
738static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
739 const struct ipv6hdr *iph)
740{
741 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
742 offsetof(typeof(flow->addrs), v6addrs.src) +
743 sizeof(flow->addrs.v6addrs.src));
744 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
745 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
746}
747
748#if IS_ENABLED(CONFIG_IPV6)
749
750/* Sysctl settings for net ipv6.auto_flowlabels */
751#define IP6_AUTO_FLOW_LABEL_OFF 0
752#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
753#define IP6_AUTO_FLOW_LABEL_OPTIN 2
754#define IP6_AUTO_FLOW_LABEL_FORCED 3
755
756#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
757
758#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
759
760static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
761 __be32 flowlabel, bool autolabel,
762 struct flowi6 *fl6)
763{
764 u32 hash;
765
766 if (flowlabel ||
767 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
768 (!autolabel &&
769 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
770 return flowlabel;
771
772 hash = skb_get_hash_flowi6(skb, fl6);
773
774 /* Since this is being sent on the wire obfuscate hash a bit
775 * to minimize possbility that any useful information to an
776 * attacker is leaked. Only lower 20 bits are relevant.
777 */
778 rol32(hash, 16);
779
780 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
781
782 if (net->ipv6.sysctl.flowlabel_state_ranges)
783 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
784
785 return flowlabel;
786}
787
788static inline int ip6_default_np_autolabel(struct net *net)
789{
790 switch (net->ipv6.sysctl.auto_flowlabels) {
791 case IP6_AUTO_FLOW_LABEL_OFF:
792 case IP6_AUTO_FLOW_LABEL_OPTIN:
793 default:
794 return 0;
795 case IP6_AUTO_FLOW_LABEL_OPTOUT:
796 case IP6_AUTO_FLOW_LABEL_FORCED:
797 return 1;
798 }
799}
800#else
801static inline void ip6_set_txhash(struct sock *sk) { }
802static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
803 __be32 flowlabel, bool autolabel,
804 struct flowi6 *fl6)
805{
806 return flowlabel;
807}
808static inline int ip6_default_np_autolabel(struct net *net)
809{
810 return 0;
811}
812#endif
813
814
815/*
816 * Header manipulation
817 */
818static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
819 __be32 flowlabel)
820{
821 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
822}
823
824static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
825{
826 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
827}
828
829static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
830{
831 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
832}
833
834static inline u8 ip6_tclass(__be32 flowinfo)
835{
836 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
837}
838
839static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
840{
841 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
842}
843
844/*
845 * Prototypes exported by ipv6
846 */
847
848/*
849 * rcv function (called from netdevice level)
850 */
851
852int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
853 struct packet_type *pt, struct net_device *orig_dev);
854
855int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
856
857/*
858 * upper-layer output functions
859 */
860int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
861 struct ipv6_txoptions *opt, int tclass);
862
863int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
864
865int ip6_append_data(struct sock *sk,
866 int getfrag(void *from, char *to, int offset, int len,
867 int odd, struct sk_buff *skb),
868 void *from, int length, int transhdrlen, int hlimit,
869 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
870 struct rt6_info *rt, unsigned int flags, int dontfrag);
871
872int ip6_push_pending_frames(struct sock *sk);
873
874void ip6_flush_pending_frames(struct sock *sk);
875
876int ip6_send_skb(struct sk_buff *skb);
877
878struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
879 struct inet_cork_full *cork,
880 struct inet6_cork *v6_cork);
881struct sk_buff *ip6_make_skb(struct sock *sk,
882 int getfrag(void *from, char *to, int offset,
883 int len, int odd, struct sk_buff *skb),
884 void *from, int length, int transhdrlen,
885 int hlimit, int tclass, struct ipv6_txoptions *opt,
886 struct flowi6 *fl6, struct rt6_info *rt,
887 unsigned int flags, int dontfrag);
888
889static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
890{
891 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
892 &inet6_sk(sk)->cork);
893}
894
895int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
896 struct flowi6 *fl6);
897struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
898 const struct in6_addr *final_dst);
899struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
900 const struct in6_addr *final_dst);
901struct dst_entry *ip6_blackhole_route(struct net *net,
902 struct dst_entry *orig_dst);
903
904/*
905 * skb processing functions
906 */
907
908int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
909int ip6_forward(struct sk_buff *skb);
910int ip6_input(struct sk_buff *skb);
911int ip6_mc_input(struct sk_buff *skb);
912
913int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
914int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
915
916/*
917 * Extension header (options) processing
918 */
919
920void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
921 u8 *proto, struct in6_addr **daddr_p);
922void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
923 u8 *proto);
924
925int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
926 __be16 *frag_offp);
927
928bool ipv6_ext_hdr(u8 nexthdr);
929
930enum {
931 IP6_FH_F_FRAG = (1 << 0),
932 IP6_FH_F_AUTH = (1 << 1),
933 IP6_FH_F_SKIP_RH = (1 << 2),
934};
935
936/* find specified header and get offset to it */
937int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
938 unsigned short *fragoff, int *fragflg);
939
940int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
941
942struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
943 const struct ipv6_txoptions *opt,
944 struct in6_addr *orig);
945
946/*
947 * socket options (ipv6_sockglue.c)
948 */
949
950int ipv6_setsockopt(struct sock *sk, int level, int optname,
951 char __user *optval, unsigned int optlen);
952int ipv6_getsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, int __user *optlen);
954int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
955 char __user *optval, unsigned int optlen);
956int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
957 char __user *optval, int __user *optlen);
958
959int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
960int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
961 int addr_len);
962int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
963void ip6_datagram_release_cb(struct sock *sk);
964
965int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
966 int *addr_len);
967int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
968 int *addr_len);
969void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
970 u32 info, u8 *payload);
971void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
972void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
973
974int inet6_release(struct socket *sock);
975int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
976int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
977 int peer);
978int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
979
980int inet6_hash_connect(struct inet_timewait_death_row *death_row,
981 struct sock *sk);
982
983/*
984 * reassembly.c
985 */
986extern const struct proto_ops inet6_stream_ops;
987extern const struct proto_ops inet6_dgram_ops;
988
989struct group_source_req;
990struct group_filter;
991
992int ip6_mc_source(int add, int omode, struct sock *sk,
993 struct group_source_req *pgsr);
994int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
995int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
996 struct group_filter __user *optval, int __user *optlen);
997
998#ifdef CONFIG_PROC_FS
999int ac6_proc_init(struct net *net);
1000void ac6_proc_exit(struct net *net);
1001int raw6_proc_init(void);
1002void raw6_proc_exit(void);
1003int tcp6_proc_init(struct net *net);
1004void tcp6_proc_exit(struct net *net);
1005int udp6_proc_init(struct net *net);
1006void udp6_proc_exit(struct net *net);
1007int udplite6_proc_init(void);
1008void udplite6_proc_exit(void);
1009int ipv6_misc_proc_init(void);
1010void ipv6_misc_proc_exit(void);
1011int snmp6_register_dev(struct inet6_dev *idev);
1012int snmp6_unregister_dev(struct inet6_dev *idev);
1013
1014#else
1015static inline int ac6_proc_init(struct net *net) { return 0; }
1016static inline void ac6_proc_exit(struct net *net) { }
1017static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1018static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1019#endif
1020
1021#ifdef CONFIG_SYSCTL
1022extern struct ctl_table ipv6_route_table_template[];
1023
1024struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1025struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1026int ipv6_sysctl_register(void);
1027void ipv6_sysctl_unregister(void);
1028#endif
1029
1030int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1031 const struct in6_addr *addr);
1032int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1033 const struct in6_addr *addr);
1034#endif /* _NET_IPV6_H */