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inet: frag , remove an empty ifdef.
[deliverable/linux.git] / include / net / ipv6.h
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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_MOBILITY 135 /* Mobility header. */
45
46#define NEXTHDR_MAX 255
47
48
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
114#include <net/sock.h>
115
116/* sysctls */
117extern int sysctl_mld_max_msf;
118
119#define _DEVINC(net, statname, modifier, idev, field) \
120({ \
121 struct inet6_dev *_idev = (idev); \
122 if (likely(_idev != NULL)) \
123 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
124 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
125})
126
127/* per device counters are atomic_long_t */
128#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
129({ \
130 struct inet6_dev *_idev = (idev); \
131 if (likely(_idev != NULL)) \
132 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
133 SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
134})
135
136/* per device and per net counters are atomic_long_t */
137#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
138({ \
139 struct inet6_dev *_idev = (idev); \
140 if (likely(_idev != NULL)) \
141 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
142 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
143})
144
145#define _DEVADD(net, statname, modifier, idev, field, val) \
146({ \
147 struct inet6_dev *_idev = (idev); \
148 if (likely(_idev != NULL)) \
149 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
150 SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
151})
152
153#define _DEVUPD(net, statname, modifier, idev, field, val) \
154({ \
155 struct inet6_dev *_idev = (idev); \
156 if (likely(_idev != NULL)) \
157 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
158 SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
159})
160
161/* MIBs */
162
163#define IP6_INC_STATS(net, idev,field) \
164 _DEVINC(net, ipv6, 64, idev, field)
165#define IP6_INC_STATS_BH(net, idev,field) \
166 _DEVINC(net, ipv6, 64_BH, idev, field)
167#define IP6_ADD_STATS(net, idev,field,val) \
168 _DEVADD(net, ipv6, 64, idev, field, val)
169#define IP6_ADD_STATS_BH(net, idev,field,val) \
170 _DEVADD(net, ipv6, 64_BH, idev, field, val)
171#define IP6_UPD_PO_STATS(net, idev,field,val) \
172 _DEVUPD(net, ipv6, 64, idev, field, val)
173#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
174 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
175#define ICMP6_INC_STATS(net, idev, field) \
176 _DEVINCATOMIC(net, icmpv6, , idev, field)
177#define ICMP6_INC_STATS_BH(net, idev, field) \
178 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
179
180#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
181 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
182#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
183 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
184#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
185 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
186
187struct ip6_ra_chain {
188 struct ip6_ra_chain *next;
189 struct sock *sk;
190 int sel;
191 void (*destructor)(struct sock *);
192};
193
194extern struct ip6_ra_chain *ip6_ra_chain;
195extern rwlock_t ip6_ra_lock;
196
197/*
198 This structure is prepared by protocol, when parsing
199 ancillary data and passed to IPv6.
200 */
201
202struct ipv6_txoptions {
203 /* Length of this structure */
204 int tot_len;
205
206 /* length of extension headers */
207
208 __u16 opt_flen; /* after fragment hdr */
209 __u16 opt_nflen; /* before fragment hdr */
210
211 struct ipv6_opt_hdr *hopopt;
212 struct ipv6_opt_hdr *dst0opt;
213 struct ipv6_rt_hdr *srcrt; /* Routing Header */
214 struct ipv6_opt_hdr *dst1opt;
215
216 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
217};
218
219struct ip6_flowlabel {
220 struct ip6_flowlabel __rcu *next;
221 __be32 label;
222 atomic_t users;
223 struct in6_addr dst;
224 struct ipv6_txoptions *opt;
225 unsigned long linger;
226 struct rcu_head rcu;
227 u8 share;
228 union {
229 struct pid *pid;
230 kuid_t uid;
231 } owner;
232 unsigned long lastuse;
233 unsigned long expires;
234 struct net *fl_net;
235};
236
237#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
238#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
239
240struct ipv6_fl_socklist {
241 struct ipv6_fl_socklist __rcu *next;
242 struct ip6_flowlabel *fl;
243 struct rcu_head rcu;
244};
245
246extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
247extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
248 struct ip6_flowlabel * fl,
249 struct ipv6_txoptions * fopt);
250extern void fl6_free_socklist(struct sock *sk);
251extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
252extern int ip6_flowlabel_init(void);
253extern void ip6_flowlabel_cleanup(void);
254
255static inline void fl6_sock_release(struct ip6_flowlabel *fl)
256{
257 if (fl)
258 atomic_dec(&fl->users);
259}
260
261extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
262
263int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
264 struct icmp6hdr *thdr, int len);
265
266struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb,
267 struct sock *sk, struct flowi6 *fl6);
268
269extern int ip6_ra_control(struct sock *sk, int sel);
270
271extern int ipv6_parse_hopopts(struct sk_buff *skb);
272
273extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
274extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
275 int newtype,
276 struct ipv6_opt_hdr __user *newopt,
277 int newoptlen);
278struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
279 struct ipv6_txoptions *opt);
280
281extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
282
283static inline bool ipv6_accept_ra(struct inet6_dev *idev)
284{
285 /* If forwarding is enabled, RA are not accepted unless the special
286 * hybrid mode (accept_ra=2) is enabled.
287 */
288 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
289 idev->cnf.accept_ra;
290}
291
292#if IS_ENABLED(CONFIG_IPV6)
293static inline int ip6_frag_nqueues(struct net *net)
294{
295 return net->ipv6.frags.nqueues;
296}
297
298static inline int ip6_frag_mem(struct net *net)
299{
300 return sum_frag_mem_limit(&net->ipv6.frags);
301}
302#endif
303
304#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
305#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
306#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
307
308extern int __ipv6_addr_type(const struct in6_addr *addr);
309static inline int ipv6_addr_type(const struct in6_addr *addr)
310{
311 return __ipv6_addr_type(addr) & 0xffff;
312}
313
314static inline int ipv6_addr_scope(const struct in6_addr *addr)
315{
316 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
317}
318
319static inline int __ipv6_addr_src_scope(int type)
320{
321 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
322}
323
324static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
325{
326 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
327}
328
329static inline bool __ipv6_addr_needs_scope_id(int type)
330{
331 return type & IPV6_ADDR_LINKLOCAL ||
332 (type & IPV6_ADDR_MULTICAST &&
333 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
334}
335
336static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
337{
338 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
339}
340
341static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
342{
343 return memcmp(a1, a2, sizeof(struct in6_addr));
344}
345
346static inline bool
347ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
348 const struct in6_addr *a2)
349{
350#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
351 const unsigned long *ul1 = (const unsigned long *)a1;
352 const unsigned long *ulm = (const unsigned long *)m;
353 const unsigned long *ul2 = (const unsigned long *)a2;
354
355 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
356 ((ul1[1] ^ ul2[1]) & ulm[1]));
357#else
358 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
359 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
360 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
361 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
362#endif
363}
364
365static inline void ipv6_addr_prefix(struct in6_addr *pfx,
366 const struct in6_addr *addr,
367 int plen)
368{
369 /* caller must guarantee 0 <= plen <= 128 */
370 int o = plen >> 3,
371 b = plen & 0x7;
372
373 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
374 memcpy(pfx->s6_addr, addr, o);
375 if (b != 0)
376 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
377}
378
379static inline void __ipv6_addr_set_half(__be32 *addr,
380 __be32 wh, __be32 wl)
381{
382#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
383#if defined(__BIG_ENDIAN)
384 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
385 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
386 return;
387 }
388#elif defined(__LITTLE_ENDIAN)
389 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
390 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
391 return;
392 }
393#endif
394#endif
395 addr[0] = wh;
396 addr[1] = wl;
397}
398
399static inline void ipv6_addr_set(struct in6_addr *addr,
400 __be32 w1, __be32 w2,
401 __be32 w3, __be32 w4)
402{
403 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
404 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
405}
406
407static inline bool ipv6_addr_equal(const struct in6_addr *a1,
408 const struct in6_addr *a2)
409{
410#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
411 const unsigned long *ul1 = (const unsigned long *)a1;
412 const unsigned long *ul2 = (const unsigned long *)a2;
413
414 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
415#else
416 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
417 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
418 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
419 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
420#endif
421}
422
423#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
424static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
425 const __be64 *a2,
426 unsigned int len)
427{
428 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
429 return false;
430 return true;
431}
432
433static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
434 const struct in6_addr *addr2,
435 unsigned int prefixlen)
436{
437 const __be64 *a1 = (const __be64 *)addr1;
438 const __be64 *a2 = (const __be64 *)addr2;
439
440 if (prefixlen >= 64) {
441 if (a1[0] ^ a2[0])
442 return false;
443 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
444 }
445 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
446}
447#else
448static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
449 const struct in6_addr *addr2,
450 unsigned int prefixlen)
451{
452 const __be32 *a1 = addr1->s6_addr32;
453 const __be32 *a2 = addr2->s6_addr32;
454 unsigned int pdw, pbi;
455
456 /* check complete u32 in prefix */
457 pdw = prefixlen >> 5;
458 if (pdw && memcmp(a1, a2, pdw << 2))
459 return false;
460
461 /* check incomplete u32 in prefix */
462 pbi = prefixlen & 0x1f;
463 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
464 return false;
465
466 return true;
467}
468#endif
469
470struct inet_frag_queue;
471
472enum ip6_defrag_users {
473 IP6_DEFRAG_LOCAL_DELIVER,
474 IP6_DEFRAG_CONNTRACK_IN,
475 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
476 IP6_DEFRAG_CONNTRACK_OUT,
477 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
478 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
479 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
480};
481
482struct ip6_create_arg {
483 __be32 id;
484 u32 user;
485 const struct in6_addr *src;
486 const struct in6_addr *dst;
487 u8 ecn;
488};
489
490void ip6_frag_init(struct inet_frag_queue *q, void *a);
491bool ip6_frag_match(struct inet_frag_queue *q, void *a);
492
493/*
494 * Equivalent of ipv4 struct ip
495 */
496struct frag_queue {
497 struct inet_frag_queue q;
498
499 __be32 id; /* fragment id */
500 u32 user;
501 struct in6_addr saddr;
502 struct in6_addr daddr;
503
504 int iif;
505 unsigned int csum;
506 __u16 nhoffset;
507 u8 ecn;
508};
509
510void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
511 struct inet_frags *frags);
512
513static inline bool ipv6_addr_any(const struct in6_addr *a)
514{
515#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
516 const unsigned long *ul = (const unsigned long *)a;
517
518 return (ul[0] | ul[1]) == 0UL;
519#else
520 return (a->s6_addr32[0] | a->s6_addr32[1] |
521 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
522#endif
523}
524
525static inline u32 ipv6_addr_hash(const struct in6_addr *a)
526{
527#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
528 const unsigned long *ul = (const unsigned long *)a;
529 unsigned long x = ul[0] ^ ul[1];
530
531 return (u32)(x ^ (x >> 32));
532#else
533 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
534 a->s6_addr32[2] ^ a->s6_addr32[3]);
535#endif
536}
537
538/* more secured version of ipv6_addr_hash() */
539static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
540{
541 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
542
543 return jhash_3words(v,
544 (__force u32)a->s6_addr32[2],
545 (__force u32)a->s6_addr32[3],
546 ipv6_hash_secret);
547}
548
549static inline bool ipv6_addr_loopback(const struct in6_addr *a)
550{
551#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
552 const unsigned long *ul = (const unsigned long *)a;
553
554 return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
555#else
556 return (a->s6_addr32[0] | a->s6_addr32[1] |
557 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
558#endif
559}
560
561static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
562{
563 return (
564#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
565 *(__be64 *)a |
566#else
567 (a->s6_addr32[0] | a->s6_addr32[1]) |
568#endif
569 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
570}
571
572/*
573 * Check for a RFC 4843 ORCHID address
574 * (Overlay Routable Cryptographic Hash Identifiers)
575 */
576static inline bool ipv6_addr_orchid(const struct in6_addr *a)
577{
578 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
579}
580
581static inline void ipv6_addr_set_v4mapped(const __be32 addr,
582 struct in6_addr *v4mapped)
583{
584 ipv6_addr_set(v4mapped,
585 0, 0,
586 htonl(0x0000FFFF),
587 addr);
588}
589
590/*
591 * find the first different bit between two addresses
592 * length of address must be a multiple of 32bits
593 */
594static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
595{
596 const __be32 *a1 = token1, *a2 = token2;
597 int i;
598
599 addrlen >>= 2;
600
601 for (i = 0; i < addrlen; i++) {
602 __be32 xb = a1[i] ^ a2[i];
603 if (xb)
604 return i * 32 + 31 - __fls(ntohl(xb));
605 }
606
607 /*
608 * we should *never* get to this point since that
609 * would mean the addrs are equal
610 *
611 * However, we do get to it 8) And exacly, when
612 * addresses are equal 8)
613 *
614 * ip route add 1111::/128 via ...
615 * ip route add 1111::/64 via ...
616 * and we are here.
617 *
618 * Ideally, this function should stop comparison
619 * at prefix length. It does not, but it is still OK,
620 * if returned value is greater than prefix length.
621 * --ANK (980803)
622 */
623 return addrlen << 5;
624}
625
626#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
628{
629 const __be64 *a1 = token1, *a2 = token2;
630 int i;
631
632 addrlen >>= 3;
633
634 for (i = 0; i < addrlen; i++) {
635 __be64 xb = a1[i] ^ a2[i];
636 if (xb)
637 return i * 64 + 63 - __fls(be64_to_cpu(xb));
638 }
639
640 return addrlen << 6;
641}
642#endif
643
644static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
645{
646#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
647 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
648 return __ipv6_addr_diff64(token1, token2, addrlen);
649#endif
650 return __ipv6_addr_diff32(token1, token2, addrlen);
651}
652
653static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
654{
655 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
656}
657
658extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
659
660/*
661 * Header manipulation
662 */
663static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
664 __be32 flowlabel)
665{
666 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
667}
668
669static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
670{
671 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
672}
673
674/*
675 * Prototypes exported by ipv6
676 */
677
678/*
679 * rcv function (called from netdevice level)
680 */
681
682extern int ipv6_rcv(struct sk_buff *skb,
683 struct net_device *dev,
684 struct packet_type *pt,
685 struct net_device *orig_dev);
686
687extern int ip6_rcv_finish(struct sk_buff *skb);
688
689/*
690 * upper-layer output functions
691 */
692extern int ip6_xmit(struct sock *sk,
693 struct sk_buff *skb,
694 struct flowi6 *fl6,
695 struct ipv6_txoptions *opt,
696 int tclass);
697
698extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
699
700extern int ip6_append_data(struct sock *sk,
701 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
702 void *from,
703 int length,
704 int transhdrlen,
705 int hlimit,
706 int tclass,
707 struct ipv6_txoptions *opt,
708 struct flowi6 *fl6,
709 struct rt6_info *rt,
710 unsigned int flags,
711 int dontfrag);
712
713extern int ip6_push_pending_frames(struct sock *sk);
714
715extern void ip6_flush_pending_frames(struct sock *sk);
716
717extern int ip6_dst_lookup(struct sock *sk,
718 struct dst_entry **dst,
719 struct flowi6 *fl6);
720extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
721 struct flowi6 *fl6,
722 const struct in6_addr *final_dst,
723 bool can_sleep);
724extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
725 struct flowi6 *fl6,
726 const struct in6_addr *final_dst,
727 bool can_sleep);
728extern struct dst_entry * ip6_blackhole_route(struct net *net,
729 struct dst_entry *orig_dst);
730
731/*
732 * skb processing functions
733 */
734
735extern int ip6_output(struct sk_buff *skb);
736extern int ip6_forward(struct sk_buff *skb);
737extern int ip6_input(struct sk_buff *skb);
738extern int ip6_mc_input(struct sk_buff *skb);
739
740extern int __ip6_local_out(struct sk_buff *skb);
741extern int ip6_local_out(struct sk_buff *skb);
742
743/*
744 * Extension header (options) processing
745 */
746
747extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
748 struct ipv6_txoptions *opt,
749 u8 *proto,
750 struct in6_addr **daddr_p);
751extern void ipv6_push_frag_opts(struct sk_buff *skb,
752 struct ipv6_txoptions *opt,
753 u8 *proto);
754
755extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
756 u8 *nexthdrp, __be16 *frag_offp);
757
758extern bool ipv6_ext_hdr(u8 nexthdr);
759
760enum {
761 IP6_FH_F_FRAG = (1 << 0),
762 IP6_FH_F_AUTH = (1 << 1),
763 IP6_FH_F_SKIP_RH = (1 << 2),
764};
765
766/* find specified header and get offset to it */
767extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
768 int target, unsigned short *fragoff, int *fragflg);
769
770extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
771
772extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
773 const struct ipv6_txoptions *opt,
774 struct in6_addr *orig);
775
776/*
777 * socket options (ipv6_sockglue.c)
778 */
779
780extern int ipv6_setsockopt(struct sock *sk, int level,
781 int optname,
782 char __user *optval,
783 unsigned int optlen);
784extern int ipv6_getsockopt(struct sock *sk, int level,
785 int optname,
786 char __user *optval,
787 int __user *optlen);
788extern int compat_ipv6_setsockopt(struct sock *sk,
789 int level,
790 int optname,
791 char __user *optval,
792 unsigned int optlen);
793extern int compat_ipv6_getsockopt(struct sock *sk,
794 int level,
795 int optname,
796 char __user *optval,
797 int __user *optlen);
798
799extern int ip6_datagram_connect(struct sock *sk,
800 struct sockaddr *addr, int addr_len);
801
802extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
803extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
804extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
805 u32 info, u8 *payload);
806extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
807extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
808
809extern int inet6_release(struct socket *sock);
810extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
811 int addr_len);
812extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
813 int *uaddr_len, int peer);
814extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
815 unsigned long arg);
816
817extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
818 struct sock *sk);
819
820/*
821 * reassembly.c
822 */
823extern const struct proto_ops inet6_stream_ops;
824extern const struct proto_ops inet6_dgram_ops;
825
826struct group_source_req;
827struct group_filter;
828
829extern int ip6_mc_source(int add, int omode, struct sock *sk,
830 struct group_source_req *pgsr);
831extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
832extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
833 struct group_filter __user *optval,
834 int __user *optlen);
835extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
836 const struct in6_addr *daddr, u32 rnd);
837
838#ifdef CONFIG_PROC_FS
839extern int ac6_proc_init(struct net *net);
840extern void ac6_proc_exit(struct net *net);
841extern int raw6_proc_init(void);
842extern void raw6_proc_exit(void);
843extern int tcp6_proc_init(struct net *net);
844extern void tcp6_proc_exit(struct net *net);
845extern int udp6_proc_init(struct net *net);
846extern void udp6_proc_exit(struct net *net);
847extern int udplite6_proc_init(void);
848extern void udplite6_proc_exit(void);
849extern int ipv6_misc_proc_init(void);
850extern void ipv6_misc_proc_exit(void);
851extern int snmp6_register_dev(struct inet6_dev *idev);
852extern int snmp6_unregister_dev(struct inet6_dev *idev);
853
854#else
855static inline int ac6_proc_init(struct net *net) { return 0; }
856static inline void ac6_proc_exit(struct net *net) { }
857static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
858static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
859#endif
860
861#ifdef CONFIG_SYSCTL
862extern ctl_table ipv6_route_table_template[];
863extern ctl_table ipv6_icmp_table_template[];
864
865extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
866extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
867extern int ipv6_sysctl_register(void);
868extern void ipv6_sysctl_unregister(void);
869#endif
870
871#endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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