Loading...
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 <net/if_inet6.h>
19#include <net/ndisc.h>
20#include <net/flow.h>
21#include <net/snmp.h>
22
23#define SIN6_LEN_RFC2133 24
24
25#define IPV6_MAXPLEN 65535
26
27/*
28 * NextHeader field of IPv6 header
29 */
30
31#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
32#define NEXTHDR_TCP 6 /* TCP segment. */
33#define NEXTHDR_UDP 17 /* UDP message. */
34#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
35#define NEXTHDR_ROUTING 43 /* Routing header. */
36#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
37#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
38#define NEXTHDR_AUTH 51 /* Authentication header. */
39#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
40#define NEXTHDR_NONE 59 /* No next header */
41#define NEXTHDR_DEST 60 /* Destination options header. */
42#define NEXTHDR_MOBILITY 135 /* Mobility header. */
43
44#define NEXTHDR_MAX 255
45
46
47
48#define IPV6_DEFAULT_HOPLIMIT 64
49#define IPV6_DEFAULT_MCASTHOPS 1
50
51/*
52 * Addr type
53 *
54 * type - unicast | multicast
55 * scope - local | site | global
56 * v4 - compat
57 * v4mapped
58 * any
59 * loopback
60 */
61
62#define IPV6_ADDR_ANY 0x0000U
63
64#define IPV6_ADDR_UNICAST 0x0001U
65#define IPV6_ADDR_MULTICAST 0x0002U
66
67#define IPV6_ADDR_LOOPBACK 0x0010U
68#define IPV6_ADDR_LINKLOCAL 0x0020U
69#define IPV6_ADDR_SITELOCAL 0x0040U
70
71#define IPV6_ADDR_COMPATv4 0x0080U
72
73#define IPV6_ADDR_SCOPE_MASK 0x00f0U
74
75#define IPV6_ADDR_MAPPED 0x1000U
76
77/*
78 * Addr scopes
79 */
80#define IPV6_ADDR_MC_SCOPE(a) \
81 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
82#define __IPV6_ADDR_SCOPE_INVALID -1
83#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
84#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
85#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
86#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
87#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
88
89/*
90 * Addr flags
91 */
92#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
93 ((a)->s6_addr[1] & 0x10)
94#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
95 ((a)->s6_addr[1] & 0x20)
96#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
97 ((a)->s6_addr[1] & 0x40)
98
99/*
100 * fragmentation header
101 */
102
103struct frag_hdr {
104 __u8 nexthdr;
105 __u8 reserved;
106 __be16 frag_off;
107 __be32 identification;
108};
109
110#define IP6_MF 0x0001
111
112#include <net/sock.h>
113
114/* sysctls */
115extern int sysctl_mld_max_msf;
116
117#define _DEVINC(net, statname, modifier, idev, field) \
118({ \
119 struct inet6_dev *_idev = (idev); \
120 if (likely(_idev != NULL)) \
121 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
122 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
123})
124
125/* per device counters are atomic_long_t */
126#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
127({ \
128 struct inet6_dev *_idev = (idev); \
129 if (likely(_idev != NULL)) \
130 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
131 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
132})
133
134/* per device and per net counters are atomic_long_t */
135#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
136({ \
137 struct inet6_dev *_idev = (idev); \
138 if (likely(_idev != NULL)) \
139 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
140 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
141})
142
143#define _DEVADD(net, statname, modifier, idev, field, val) \
144({ \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
148 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
149})
150
151#define _DEVUPD(net, statname, modifier, idev, field, val) \
152({ \
153 struct inet6_dev *_idev = (idev); \
154 if (likely(_idev != NULL)) \
155 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
156 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
157})
158
159/* MIBs */
160
161#define IP6_INC_STATS(net, idev,field) \
162 _DEVINC(net, ipv6, 64, idev, field)
163#define IP6_INC_STATS_BH(net, idev,field) \
164 _DEVINC(net, ipv6, 64_BH, idev, field)
165#define IP6_ADD_STATS(net, idev,field,val) \
166 _DEVADD(net, ipv6, 64, idev, field, val)
167#define IP6_ADD_STATS_BH(net, idev,field,val) \
168 _DEVADD(net, ipv6, 64_BH, idev, field, val)
169#define IP6_UPD_PO_STATS(net, idev,field,val) \
170 _DEVUPD(net, ipv6, 64, idev, field, val)
171#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
172 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
173#define ICMP6_INC_STATS(net, idev, field) \
174 _DEVINCATOMIC(net, icmpv6, , idev, field)
175#define ICMP6_INC_STATS_BH(net, idev, field) \
176 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
177
178#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
179 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
180#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
181 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
182#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
184
185struct ip6_ra_chain {
186 struct ip6_ra_chain *next;
187 struct sock *sk;
188 int sel;
189 void (*destructor)(struct sock *);
190};
191
192extern struct ip6_ra_chain *ip6_ra_chain;
193extern rwlock_t ip6_ra_lock;
194
195/*
196 This structure is prepared by protocol, when parsing
197 ancillary data and passed to IPv6.
198 */
199
200struct ipv6_txoptions {
201 /* Length of this structure */
202 int tot_len;
203
204 /* length of extension headers */
205
206 __u16 opt_flen; /* after fragment hdr */
207 __u16 opt_nflen; /* before fragment hdr */
208
209 struct ipv6_opt_hdr *hopopt;
210 struct ipv6_opt_hdr *dst0opt;
211 struct ipv6_rt_hdr *srcrt; /* Routing Header */
212 struct ipv6_opt_hdr *dst1opt;
213
214 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
215};
216
217struct ip6_flowlabel {
218 struct ip6_flowlabel *next;
219 __be32 label;
220 atomic_t users;
221 struct in6_addr dst;
222 struct ipv6_txoptions *opt;
223 unsigned long linger;
224 u8 share;
225 u32 owner;
226 unsigned long lastuse;
227 unsigned long expires;
228 struct net *fl_net;
229};
230
231#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
232#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
233
234struct ipv6_fl_socklist {
235 struct ipv6_fl_socklist *next;
236 struct ip6_flowlabel *fl;
237};
238
239extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
240extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
241 struct ip6_flowlabel * fl,
242 struct ipv6_txoptions * fopt);
243extern void fl6_free_socklist(struct sock *sk);
244extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
245extern int ip6_flowlabel_init(void);
246extern void ip6_flowlabel_cleanup(void);
247
248static inline void fl6_sock_release(struct ip6_flowlabel *fl)
249{
250 if (fl)
251 atomic_dec(&fl->users);
252}
253
254extern int ip6_ra_control(struct sock *sk, int sel);
255
256extern int ipv6_parse_hopopts(struct sk_buff *skb);
257
258extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
259extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
260 int newtype,
261 struct ipv6_opt_hdr __user *newopt,
262 int newoptlen);
263struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
264 struct ipv6_txoptions *opt);
265
266extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
267
268int ip6_frag_nqueues(struct net *net);
269int ip6_frag_mem(struct net *net);
270
271#define IPV6_FRAG_HIGH_THRESH (256 * 1024) /* 262144 */
272#define IPV6_FRAG_LOW_THRESH (192 * 1024) /* 196608 */
273#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
274
275extern int __ipv6_addr_type(const struct in6_addr *addr);
276static inline int ipv6_addr_type(const struct in6_addr *addr)
277{
278 return __ipv6_addr_type(addr) & 0xffff;
279}
280
281static inline int ipv6_addr_scope(const struct in6_addr *addr)
282{
283 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
284}
285
286static inline int __ipv6_addr_src_scope(int type)
287{
288 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
289}
290
291static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
292{
293 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
294}
295
296static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
297{
298 return memcmp(a1, a2, sizeof(struct in6_addr));
299}
300
301static inline int
302ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
303 const struct in6_addr *a2)
304{
305 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
306 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
307 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
308 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
309}
310
311static inline void ipv6_addr_prefix(struct in6_addr *pfx,
312 const struct in6_addr *addr,
313 int plen)
314{
315 /* caller must guarantee 0 <= plen <= 128 */
316 int o = plen >> 3,
317 b = plen & 0x7;
318
319 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
320 memcpy(pfx->s6_addr, addr, o);
321 if (b != 0)
322 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
323}
324
325static inline void ipv6_addr_set(struct in6_addr *addr,
326 __be32 w1, __be32 w2,
327 __be32 w3, __be32 w4)
328{
329 addr->s6_addr32[0] = w1;
330 addr->s6_addr32[1] = w2;
331 addr->s6_addr32[2] = w3;
332 addr->s6_addr32[3] = w4;
333}
334
335static inline bool ipv6_addr_equal(const struct in6_addr *a1,
336 const struct in6_addr *a2)
337{
338 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
339 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
340 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
341 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
342}
343
344static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
345 unsigned int prefixlen)
346{
347 unsigned int pdw, pbi;
348
349 /* check complete u32 in prefix */
350 pdw = prefixlen >> 5;
351 if (pdw && memcmp(a1, a2, pdw << 2))
352 return false;
353
354 /* check incomplete u32 in prefix */
355 pbi = prefixlen & 0x1f;
356 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
357 return false;
358
359 return true;
360}
361
362static inline bool ipv6_prefix_equal(const struct in6_addr *a1,
363 const struct in6_addr *a2,
364 unsigned int prefixlen)
365{
366 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
367 prefixlen);
368}
369
370struct inet_frag_queue;
371
372enum ip6_defrag_users {
373 IP6_DEFRAG_LOCAL_DELIVER,
374 IP6_DEFRAG_CONNTRACK_IN,
375 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
376 IP6_DEFRAG_CONNTRACK_OUT,
377 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
378 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
379 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
380};
381
382struct ip6_create_arg {
383 __be32 id;
384 u32 user;
385 const struct in6_addr *src;
386 const struct in6_addr *dst;
387};
388
389void ip6_frag_init(struct inet_frag_queue *q, void *a);
390bool ip6_frag_match(struct inet_frag_queue *q, void *a);
391
392static inline bool ipv6_addr_any(const struct in6_addr *a)
393{
394 return (a->s6_addr32[0] | a->s6_addr32[1] |
395 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
396}
397
398static inline bool ipv6_addr_loopback(const struct in6_addr *a)
399{
400 return (a->s6_addr32[0] | a->s6_addr32[1] |
401 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
402}
403
404static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
405{
406 return (a->s6_addr32[0] | a->s6_addr32[1] |
407 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
408}
409
410/*
411 * Check for a RFC 4843 ORCHID address
412 * (Overlay Routable Cryptographic Hash Identifiers)
413 */
414static inline bool ipv6_addr_orchid(const struct in6_addr *a)
415{
416 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
417}
418
419static inline void ipv6_addr_set_v4mapped(const __be32 addr,
420 struct in6_addr *v4mapped)
421{
422 ipv6_addr_set(v4mapped,
423 0, 0,
424 htonl(0x0000FFFF),
425 addr);
426}
427
428/*
429 * find the first different bit between two addresses
430 * length of address must be a multiple of 32bits
431 */
432static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
433{
434 const __be32 *a1 = token1, *a2 = token2;
435 int i;
436
437 addrlen >>= 2;
438
439 for (i = 0; i < addrlen; i++) {
440 __be32 xb = a1[i] ^ a2[i];
441 if (xb)
442 return i * 32 + 31 - __fls(ntohl(xb));
443 }
444
445 /*
446 * we should *never* get to this point since that
447 * would mean the addrs are equal
448 *
449 * However, we do get to it 8) And exacly, when
450 * addresses are equal 8)
451 *
452 * ip route add 1111::/128 via ...
453 * ip route add 1111::/64 via ...
454 * and we are here.
455 *
456 * Ideally, this function should stop comparison
457 * at prefix length. It does not, but it is still OK,
458 * if returned value is greater than prefix length.
459 * --ANK (980803)
460 */
461 return addrlen << 5;
462}
463
464static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
465{
466 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
467}
468
469extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
470
471/*
472 * Prototypes exported by ipv6
473 */
474
475/*
476 * rcv function (called from netdevice level)
477 */
478
479extern int ipv6_rcv(struct sk_buff *skb,
480 struct net_device *dev,
481 struct packet_type *pt,
482 struct net_device *orig_dev);
483
484extern int ip6_rcv_finish(struct sk_buff *skb);
485
486/*
487 * upper-layer output functions
488 */
489extern int ip6_xmit(struct sock *sk,
490 struct sk_buff *skb,
491 struct flowi6 *fl6,
492 struct ipv6_txoptions *opt,
493 int tclass);
494
495extern int ip6_nd_hdr(struct sock *sk,
496 struct sk_buff *skb,
497 struct net_device *dev,
498 const struct in6_addr *saddr,
499 const struct in6_addr *daddr,
500 int proto, int len);
501
502extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
503
504extern int ip6_append_data(struct sock *sk,
505 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
506 void *from,
507 int length,
508 int transhdrlen,
509 int hlimit,
510 int tclass,
511 struct ipv6_txoptions *opt,
512 struct flowi6 *fl6,
513 struct rt6_info *rt,
514 unsigned int flags,
515 int dontfrag);
516
517extern int ip6_push_pending_frames(struct sock *sk);
518
519extern void ip6_flush_pending_frames(struct sock *sk);
520
521extern int ip6_dst_lookup(struct sock *sk,
522 struct dst_entry **dst,
523 struct flowi6 *fl6);
524extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
525 struct flowi6 *fl6,
526 const struct in6_addr *final_dst,
527 bool can_sleep);
528extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
529 struct flowi6 *fl6,
530 const struct in6_addr *final_dst,
531 bool can_sleep);
532extern struct dst_entry * ip6_blackhole_route(struct net *net,
533 struct dst_entry *orig_dst);
534
535/*
536 * skb processing functions
537 */
538
539extern int ip6_output(struct sk_buff *skb);
540extern int ip6_forward(struct sk_buff *skb);
541extern int ip6_input(struct sk_buff *skb);
542extern int ip6_mc_input(struct sk_buff *skb);
543
544extern int __ip6_local_out(struct sk_buff *skb);
545extern int ip6_local_out(struct sk_buff *skb);
546
547/*
548 * Extension header (options) processing
549 */
550
551extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
552 struct ipv6_txoptions *opt,
553 u8 *proto,
554 struct in6_addr **daddr_p);
555extern void ipv6_push_frag_opts(struct sk_buff *skb,
556 struct ipv6_txoptions *opt,
557 u8 *proto);
558
559extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
560 u8 *nexthdrp, __be16 *frag_offp);
561
562extern bool ipv6_ext_hdr(u8 nexthdr);
563
564extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
565
566extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
567 const struct ipv6_txoptions *opt,
568 struct in6_addr *orig);
569
570/*
571 * socket options (ipv6_sockglue.c)
572 */
573
574extern int ipv6_setsockopt(struct sock *sk, int level,
575 int optname,
576 char __user *optval,
577 unsigned int optlen);
578extern int ipv6_getsockopt(struct sock *sk, int level,
579 int optname,
580 char __user *optval,
581 int __user *optlen);
582extern int compat_ipv6_setsockopt(struct sock *sk,
583 int level,
584 int optname,
585 char __user *optval,
586 unsigned int optlen);
587extern int compat_ipv6_getsockopt(struct sock *sk,
588 int level,
589 int optname,
590 char __user *optval,
591 int __user *optlen);
592
593extern int ip6_datagram_connect(struct sock *sk,
594 struct sockaddr *addr, int addr_len);
595
596extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
597extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
598extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
599 u32 info, u8 *payload);
600extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
601extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
602
603extern int inet6_release(struct socket *sock);
604extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
605 int addr_len);
606extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
607 int *uaddr_len, int peer);
608extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
609 unsigned long arg);
610
611extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
612 struct sock *sk);
613
614/*
615 * reassembly.c
616 */
617extern const struct proto_ops inet6_stream_ops;
618extern const struct proto_ops inet6_dgram_ops;
619
620struct group_source_req;
621struct group_filter;
622
623extern int ip6_mc_source(int add, int omode, struct sock *sk,
624 struct group_source_req *pgsr);
625extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
626extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
627 struct group_filter __user *optval,
628 int __user *optlen);
629extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
630 const struct in6_addr *daddr, u32 rnd);
631
632#ifdef CONFIG_PROC_FS
633extern int ac6_proc_init(struct net *net);
634extern void ac6_proc_exit(struct net *net);
635extern int raw6_proc_init(void);
636extern void raw6_proc_exit(void);
637extern int tcp6_proc_init(struct net *net);
638extern void tcp6_proc_exit(struct net *net);
639extern int udp6_proc_init(struct net *net);
640extern void udp6_proc_exit(struct net *net);
641extern int udplite6_proc_init(void);
642extern void udplite6_proc_exit(void);
643extern int ipv6_misc_proc_init(void);
644extern void ipv6_misc_proc_exit(void);
645extern int snmp6_register_dev(struct inet6_dev *idev);
646extern int snmp6_unregister_dev(struct inet6_dev *idev);
647
648#else
649static inline int ac6_proc_init(struct net *net) { return 0; }
650static inline void ac6_proc_exit(struct net *net) { }
651static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
652static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
653#endif
654
655#ifdef CONFIG_SYSCTL
656extern ctl_table ipv6_route_table_template[];
657extern ctl_table ipv6_icmp_table_template[];
658
659extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
660extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
661extern int ipv6_sysctl_register(void);
662extern void ipv6_sysctl_unregister(void);
663#endif
664
665#endif /* _NET_IPV6_H */