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ipv4, ipv6: Pass net into ip_local_out and ip6_local_out
[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/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 /* Length of this structure */
209 int tot_len;
210
211 /* length of extension headers */
212
213 __u16 opt_flen; /* after fragment hdr */
214 __u16 opt_nflen; /* before fragment hdr */
215
216 struct ipv6_opt_hdr *hopopt;
217 struct ipv6_opt_hdr *dst0opt;
218 struct ipv6_rt_hdr *srcrt; /* Routing Header */
219 struct ipv6_opt_hdr *dst1opt;
220
221 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
222};
223
224struct ip6_flowlabel {
225 struct ip6_flowlabel __rcu *next;
226 __be32 label;
227 atomic_t users;
228 struct in6_addr dst;
229 struct ipv6_txoptions *opt;
230 unsigned long linger;
231 struct rcu_head rcu;
232 u8 share;
233 union {
234 struct pid *pid;
235 kuid_t uid;
236 } owner;
237 unsigned long lastuse;
238 unsigned long expires;
239 struct net *fl_net;
240};
241
242#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
243#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
244#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
245
246#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
247#define IPV6_TCLASS_SHIFT 20
248
249struct ipv6_fl_socklist {
250 struct ipv6_fl_socklist __rcu *next;
251 struct ip6_flowlabel *fl;
252 struct rcu_head rcu;
253};
254
255struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
256struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
257 struct ip6_flowlabel *fl,
258 struct ipv6_txoptions *fopt);
259void fl6_free_socklist(struct sock *sk);
260int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
261int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
262 int flags);
263int ip6_flowlabel_init(void);
264void ip6_flowlabel_cleanup(void);
265
266static inline void fl6_sock_release(struct ip6_flowlabel *fl)
267{
268 if (fl)
269 atomic_dec(&fl->users);
270}
271
272void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
273
274int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
275 struct icmp6hdr *thdr, int len);
276
277int ip6_ra_control(struct sock *sk, int sel);
278
279int ipv6_parse_hopopts(struct sk_buff *skb);
280
281struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
282 struct ipv6_txoptions *opt);
283struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
284 struct ipv6_txoptions *opt,
285 int newtype,
286 struct ipv6_opt_hdr __user *newopt,
287 int newoptlen);
288struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
289 struct ipv6_txoptions *opt);
290
291bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
292 const struct inet6_skb_parm *opt);
293
294static inline bool ipv6_accept_ra(struct inet6_dev *idev)
295{
296 /* If forwarding is enabled, RA are not accepted unless the special
297 * hybrid mode (accept_ra=2) is enabled.
298 */
299 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
300 idev->cnf.accept_ra;
301}
302
303#if IS_ENABLED(CONFIG_IPV6)
304static inline int ip6_frag_mem(struct net *net)
305{
306 return sum_frag_mem_limit(&net->ipv6.frags);
307}
308#endif
309
310#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
311#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
312#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
313
314int __ipv6_addr_type(const struct in6_addr *addr);
315static inline int ipv6_addr_type(const struct in6_addr *addr)
316{
317 return __ipv6_addr_type(addr) & 0xffff;
318}
319
320static inline int ipv6_addr_scope(const struct in6_addr *addr)
321{
322 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
323}
324
325static inline int __ipv6_addr_src_scope(int type)
326{
327 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
328}
329
330static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
331{
332 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
333}
334
335static inline bool __ipv6_addr_needs_scope_id(int type)
336{
337 return type & IPV6_ADDR_LINKLOCAL ||
338 (type & IPV6_ADDR_MULTICAST &&
339 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
340}
341
342static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
343{
344 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
345}
346
347static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
348{
349 return memcmp(a1, a2, sizeof(struct in6_addr));
350}
351
352static inline bool
353ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
354 const struct in6_addr *a2)
355{
356#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
357 const unsigned long *ul1 = (const unsigned long *)a1;
358 const unsigned long *ulm = (const unsigned long *)m;
359 const unsigned long *ul2 = (const unsigned long *)a2;
360
361 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
362 ((ul1[1] ^ ul2[1]) & ulm[1]));
363#else
364 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
365 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
366 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
367 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
368#endif
369}
370
371static inline void ipv6_addr_prefix(struct in6_addr *pfx,
372 const struct in6_addr *addr,
373 int plen)
374{
375 /* caller must guarantee 0 <= plen <= 128 */
376 int o = plen >> 3,
377 b = plen & 0x7;
378
379 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
380 memcpy(pfx->s6_addr, addr, o);
381 if (b != 0)
382 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
383}
384
385static inline void __ipv6_addr_set_half(__be32 *addr,
386 __be32 wh, __be32 wl)
387{
388#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
389#if defined(__BIG_ENDIAN)
390 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
391 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
392 return;
393 }
394#elif defined(__LITTLE_ENDIAN)
395 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
396 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
397 return;
398 }
399#endif
400#endif
401 addr[0] = wh;
402 addr[1] = wl;
403}
404
405static inline void ipv6_addr_set(struct in6_addr *addr,
406 __be32 w1, __be32 w2,
407 __be32 w3, __be32 w4)
408{
409 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
410 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
411}
412
413static inline bool ipv6_addr_equal(const struct in6_addr *a1,
414 const struct in6_addr *a2)
415{
416#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
417 const unsigned long *ul1 = (const unsigned long *)a1;
418 const unsigned long *ul2 = (const unsigned long *)a2;
419
420 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
421#else
422 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
423 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
424 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
425 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
426#endif
427}
428
429#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
430static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
431 const __be64 *a2,
432 unsigned int len)
433{
434 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
435 return false;
436 return true;
437}
438
439static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
440 const struct in6_addr *addr2,
441 unsigned int prefixlen)
442{
443 const __be64 *a1 = (const __be64 *)addr1;
444 const __be64 *a2 = (const __be64 *)addr2;
445
446 if (prefixlen >= 64) {
447 if (a1[0] ^ a2[0])
448 return false;
449 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
450 }
451 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
452}
453#else
454static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
455 const struct in6_addr *addr2,
456 unsigned int prefixlen)
457{
458 const __be32 *a1 = addr1->s6_addr32;
459 const __be32 *a2 = addr2->s6_addr32;
460 unsigned int pdw, pbi;
461
462 /* check complete u32 in prefix */
463 pdw = prefixlen >> 5;
464 if (pdw && memcmp(a1, a2, pdw << 2))
465 return false;
466
467 /* check incomplete u32 in prefix */
468 pbi = prefixlen & 0x1f;
469 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
470 return false;
471
472 return true;
473}
474#endif
475
476struct inet_frag_queue;
477
478enum ip6_defrag_users {
479 IP6_DEFRAG_LOCAL_DELIVER,
480 IP6_DEFRAG_CONNTRACK_IN,
481 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
482 IP6_DEFRAG_CONNTRACK_OUT,
483 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
484 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
485 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
486};
487
488struct ip6_create_arg {
489 __be32 id;
490 u32 user;
491 const struct in6_addr *src;
492 const struct in6_addr *dst;
493 u8 ecn;
494};
495
496void ip6_frag_init(struct inet_frag_queue *q, const void *a);
497bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
498
499/*
500 * Equivalent of ipv4 struct ip
501 */
502struct frag_queue {
503 struct inet_frag_queue q;
504
505 __be32 id; /* fragment id */
506 u32 user;
507 struct in6_addr saddr;
508 struct in6_addr daddr;
509
510 int iif;
511 unsigned int csum;
512 __u16 nhoffset;
513 u8 ecn;
514};
515
516void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
517 struct inet_frags *frags);
518
519static inline bool ipv6_addr_any(const struct in6_addr *a)
520{
521#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
522 const unsigned long *ul = (const unsigned long *)a;
523
524 return (ul[0] | ul[1]) == 0UL;
525#else
526 return (a->s6_addr32[0] | a->s6_addr32[1] |
527 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
528#endif
529}
530
531static inline u32 ipv6_addr_hash(const struct in6_addr *a)
532{
533#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
534 const unsigned long *ul = (const unsigned long *)a;
535 unsigned long x = ul[0] ^ ul[1];
536
537 return (u32)(x ^ (x >> 32));
538#else
539 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
540 a->s6_addr32[2] ^ a->s6_addr32[3]);
541#endif
542}
543
544/* more secured version of ipv6_addr_hash() */
545static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
546{
547 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
548
549 return jhash_3words(v,
550 (__force u32)a->s6_addr32[2],
551 (__force u32)a->s6_addr32[3],
552 initval);
553}
554
555static inline bool ipv6_addr_loopback(const struct in6_addr *a)
556{
557#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
558 const __be64 *be = (const __be64 *)a;
559
560 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
561#else
562 return (a->s6_addr32[0] | a->s6_addr32[1] |
563 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
564#endif
565}
566
567/*
568 * Note that we must __force cast these to unsigned long to make sparse happy,
569 * since all of the endian-annotated types are fixed size regardless of arch.
570 */
571static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
572{
573 return (
574#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
575 *(unsigned long *)a |
576#else
577 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
578#endif
579 (__force unsigned long)(a->s6_addr32[2] ^
580 cpu_to_be32(0x0000ffff))) == 0UL;
581}
582
583/*
584 * Check for a RFC 4843 ORCHID address
585 * (Overlay Routable Cryptographic Hash Identifiers)
586 */
587static inline bool ipv6_addr_orchid(const struct in6_addr *a)
588{
589 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
590}
591
592static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
593{
594 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
595}
596
597static inline void ipv6_addr_set_v4mapped(const __be32 addr,
598 struct in6_addr *v4mapped)
599{
600 ipv6_addr_set(v4mapped,
601 0, 0,
602 htonl(0x0000FFFF),
603 addr);
604}
605
606/*
607 * find the first different bit between two addresses
608 * length of address must be a multiple of 32bits
609 */
610static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
611{
612 const __be32 *a1 = token1, *a2 = token2;
613 int i;
614
615 addrlen >>= 2;
616
617 for (i = 0; i < addrlen; i++) {
618 __be32 xb = a1[i] ^ a2[i];
619 if (xb)
620 return i * 32 + 31 - __fls(ntohl(xb));
621 }
622
623 /*
624 * we should *never* get to this point since that
625 * would mean the addrs are equal
626 *
627 * However, we do get to it 8) And exacly, when
628 * addresses are equal 8)
629 *
630 * ip route add 1111::/128 via ...
631 * ip route add 1111::/64 via ...
632 * and we are here.
633 *
634 * Ideally, this function should stop comparison
635 * at prefix length. It does not, but it is still OK,
636 * if returned value is greater than prefix length.
637 * --ANK (980803)
638 */
639 return addrlen << 5;
640}
641
642#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
643static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
644{
645 const __be64 *a1 = token1, *a2 = token2;
646 int i;
647
648 addrlen >>= 3;
649
650 for (i = 0; i < addrlen; i++) {
651 __be64 xb = a1[i] ^ a2[i];
652 if (xb)
653 return i * 64 + 63 - __fls(be64_to_cpu(xb));
654 }
655
656 return addrlen << 6;
657}
658#endif
659
660static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
661{
662#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
663 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
664 return __ipv6_addr_diff64(token1, token2, addrlen);
665#endif
666 return __ipv6_addr_diff32(token1, token2, addrlen);
667}
668
669static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
670{
671 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
672}
673
674__be32 ipv6_select_ident(struct net *net,
675 const struct in6_addr *daddr,
676 const struct in6_addr *saddr);
677void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
678
679int ip6_dst_hoplimit(struct dst_entry *dst);
680
681static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
682 struct dst_entry *dst)
683{
684 int hlimit;
685
686 if (ipv6_addr_is_multicast(&fl6->daddr))
687 hlimit = np->mcast_hops;
688 else
689 hlimit = np->hop_limit;
690 if (hlimit < 0)
691 hlimit = ip6_dst_hoplimit(dst);
692 return hlimit;
693}
694
695/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
696 * Equivalent to : flow->v6addrs.src = iph->saddr;
697 * flow->v6addrs.dst = iph->daddr;
698 */
699static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
700 const struct ipv6hdr *iph)
701{
702 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
703 offsetof(typeof(flow->addrs), v6addrs.src) +
704 sizeof(flow->addrs.v6addrs.src));
705 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
706 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
707}
708
709#if IS_ENABLED(CONFIG_IPV6)
710
711/* Sysctl settings for net ipv6.auto_flowlabels */
712#define IP6_AUTO_FLOW_LABEL_OFF 0
713#define IP6_AUTO_FLOW_LABEL_OPTOUT 1
714#define IP6_AUTO_FLOW_LABEL_OPTIN 2
715#define IP6_AUTO_FLOW_LABEL_FORCED 3
716
717#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
718
719#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
720
721static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
722 __be32 flowlabel, bool autolabel,
723 struct flowi6 *fl6)
724{
725 u32 hash;
726
727 if (flowlabel ||
728 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
729 (!autolabel &&
730 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
731 return flowlabel;
732
733 hash = skb_get_hash_flowi6(skb, fl6);
734
735 /* Since this is being sent on the wire obfuscate hash a bit
736 * to minimize possbility that any useful information to an
737 * attacker is leaked. Only lower 20 bits are relevant.
738 */
739 rol32(hash, 16);
740
741 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
742
743 if (net->ipv6.sysctl.flowlabel_state_ranges)
744 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
745
746 return flowlabel;
747}
748
749static inline int ip6_default_np_autolabel(struct net *net)
750{
751 switch (net->ipv6.sysctl.auto_flowlabels) {
752 case IP6_AUTO_FLOW_LABEL_OFF:
753 case IP6_AUTO_FLOW_LABEL_OPTIN:
754 default:
755 return 0;
756 case IP6_AUTO_FLOW_LABEL_OPTOUT:
757 case IP6_AUTO_FLOW_LABEL_FORCED:
758 return 1;
759 }
760}
761#else
762static inline void ip6_set_txhash(struct sock *sk) { }
763static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
764 __be32 flowlabel, bool autolabel,
765 struct flowi6 *fl6)
766{
767 return flowlabel;
768}
769static inline int ip6_default_np_autolabel(struct net *net)
770{
771 return 0;
772}
773#endif
774
775
776/*
777 * Header manipulation
778 */
779static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
780 __be32 flowlabel)
781{
782 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
783}
784
785static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
786{
787 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
788}
789
790static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
791{
792 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
793}
794
795static inline u8 ip6_tclass(__be32 flowinfo)
796{
797 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
798}
799/*
800 * Prototypes exported by ipv6
801 */
802
803/*
804 * rcv function (called from netdevice level)
805 */
806
807int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
808 struct packet_type *pt, struct net_device *orig_dev);
809
810int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
811
812/*
813 * upper-layer output functions
814 */
815int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
816 struct ipv6_txoptions *opt, int tclass);
817
818int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
819
820int ip6_append_data(struct sock *sk,
821 int getfrag(void *from, char *to, int offset, int len,
822 int odd, struct sk_buff *skb),
823 void *from, int length, int transhdrlen, int hlimit,
824 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
825 struct rt6_info *rt, unsigned int flags, int dontfrag);
826
827int ip6_push_pending_frames(struct sock *sk);
828
829void ip6_flush_pending_frames(struct sock *sk);
830
831int ip6_send_skb(struct sk_buff *skb);
832
833struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
834 struct inet_cork_full *cork,
835 struct inet6_cork *v6_cork);
836struct sk_buff *ip6_make_skb(struct sock *sk,
837 int getfrag(void *from, char *to, int offset,
838 int len, int odd, struct sk_buff *skb),
839 void *from, int length, int transhdrlen,
840 int hlimit, int tclass, struct ipv6_txoptions *opt,
841 struct flowi6 *fl6, struct rt6_info *rt,
842 unsigned int flags, int dontfrag);
843
844static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
845{
846 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
847 &inet6_sk(sk)->cork);
848}
849
850int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
851 struct flowi6 *fl6);
852struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
853 const struct in6_addr *final_dst);
854struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
855 const struct in6_addr *final_dst);
856struct dst_entry *ip6_blackhole_route(struct net *net,
857 struct dst_entry *orig_dst);
858
859/*
860 * skb processing functions
861 */
862
863int ip6_output(struct sock *sk, struct sk_buff *skb);
864int ip6_forward(struct sk_buff *skb);
865int ip6_input(struct sk_buff *skb);
866int ip6_mc_input(struct sk_buff *skb);
867
868int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
869int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
870
871/*
872 * Extension header (options) processing
873 */
874
875void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
876 u8 *proto, struct in6_addr **daddr_p);
877void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
878 u8 *proto);
879
880int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
881 __be16 *frag_offp);
882
883bool ipv6_ext_hdr(u8 nexthdr);
884
885enum {
886 IP6_FH_F_FRAG = (1 << 0),
887 IP6_FH_F_AUTH = (1 << 1),
888 IP6_FH_F_SKIP_RH = (1 << 2),
889};
890
891/* find specified header and get offset to it */
892int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
893 unsigned short *fragoff, int *fragflg);
894
895int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
896
897struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
898 const struct ipv6_txoptions *opt,
899 struct in6_addr *orig);
900
901/*
902 * socket options (ipv6_sockglue.c)
903 */
904
905int ipv6_setsockopt(struct sock *sk, int level, int optname,
906 char __user *optval, unsigned int optlen);
907int ipv6_getsockopt(struct sock *sk, int level, int optname,
908 char __user *optval, int __user *optlen);
909int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
910 char __user *optval, unsigned int optlen);
911int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
912 char __user *optval, int __user *optlen);
913
914int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
915int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
916 int addr_len);
917
918int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
919 int *addr_len);
920int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
921 int *addr_len);
922void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
923 u32 info, u8 *payload);
924void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
925void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
926
927int inet6_release(struct socket *sock);
928int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
929int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
930 int peer);
931int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
932
933int inet6_hash_connect(struct inet_timewait_death_row *death_row,
934 struct sock *sk);
935
936/*
937 * reassembly.c
938 */
939extern const struct proto_ops inet6_stream_ops;
940extern const struct proto_ops inet6_dgram_ops;
941
942struct group_source_req;
943struct group_filter;
944
945int ip6_mc_source(int add, int omode, struct sock *sk,
946 struct group_source_req *pgsr);
947int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
948int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
949 struct group_filter __user *optval, int __user *optlen);
950
951#ifdef CONFIG_PROC_FS
952int ac6_proc_init(struct net *net);
953void ac6_proc_exit(struct net *net);
954int raw6_proc_init(void);
955void raw6_proc_exit(void);
956int tcp6_proc_init(struct net *net);
957void tcp6_proc_exit(struct net *net);
958int udp6_proc_init(struct net *net);
959void udp6_proc_exit(struct net *net);
960int udplite6_proc_init(void);
961void udplite6_proc_exit(void);
962int ipv6_misc_proc_init(void);
963void ipv6_misc_proc_exit(void);
964int snmp6_register_dev(struct inet6_dev *idev);
965int snmp6_unregister_dev(struct inet6_dev *idev);
966
967#else
968static inline int ac6_proc_init(struct net *net) { return 0; }
969static inline void ac6_proc_exit(struct net *net) { }
970static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
971static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
972#endif
973
974#ifdef CONFIG_SYSCTL
975extern struct ctl_table ipv6_route_table_template[];
976
977struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
978struct ctl_table *ipv6_route_sysctl_init(struct net *net);
979int ipv6_sysctl_register(void);
980void ipv6_sysctl_unregister(void);
981#endif
982
983int ipv6_sock_mc_join(struct sock *sk, int ifindex,
984 const struct in6_addr *addr);
985int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
986 const struct in6_addr *addr);
987#endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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