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 <linux/refcount.h>
20 #include <net/if_inet6.h>
21 #include <net/ndisc.h>
22 #include <net/flow.h>
23 #include <net/flow_dissector.h>
24 #include <net/snmp.h>
25
26 #define SIN6_LEN_RFC2133 24
27
28 #define IPV6_MAXPLEN 65535
29
30 /*
31 * NextHeader field of IPv6 header
32 */
33
34 #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
35 #define NEXTHDR_TCP 6 /* TCP segment. */
36 #define NEXTHDR_UDP 17 /* UDP message. */
37 #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
38 #define NEXTHDR_ROUTING 43 /* Routing header. */
39 #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
40 #define NEXTHDR_GRE 47 /* GRE header. */
41 #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
42 #define NEXTHDR_AUTH 51 /* Authentication header. */
43 #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
44 #define NEXTHDR_NONE 59 /* No next header */
45 #define NEXTHDR_DEST 60 /* Destination options header. */
46 #define NEXTHDR_SCTP 132 /* SCTP message. */
47 #define NEXTHDR_MOBILITY 135 /* Mobility header. */
48
49 #define NEXTHDR_MAX 255
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
106 struct 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 #define IP6_REPLY_MARK(net, mark) \
117 ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
118
119 #include <net/sock.h>
120
121 /* sysctls */
122 extern int sysctl_mld_max_msf;
123 extern int sysctl_mld_qrv;
124
125 #define _DEVINC(net, statname, mod, idev, field) \
126 ({ \
127 struct inet6_dev *_idev = (idev); \
128 if (likely(_idev != NULL)) \
129 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
130 mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
131 })
132
133 /* per device counters are atomic_long_t */
134 #define _DEVINCATOMIC(net, statname, mod, idev, field) \
135 ({ \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
139 mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
140 })
141
142 /* per device and per net counters are atomic_long_t */
143 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
144 ({ \
145 struct inet6_dev *_idev = (idev); \
146 if (likely(_idev != NULL)) \
147 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
148 SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
149 })
150
151 #define _DEVADD(net, statname, mod, idev, field, val) \
152 ({ \
153 struct inet6_dev *_idev = (idev); \
154 if (likely(_idev != NULL)) \
155 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
156 mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
157 })
158
159 #define _DEVUPD(net, statname, mod, idev, field, val) \
160 ({ \
161 struct inet6_dev *_idev = (idev); \
162 if (likely(_idev != NULL)) \
163 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
164 mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
165 })
166
167 /* MIBs */
168
169 #define IP6_INC_STATS(net, idev,field) \
170 _DEVINC(net, ipv6, , idev, field)
171 #define __IP6_INC_STATS(net, idev,field) \
172 _DEVINC(net, ipv6, __, idev, field)
173 #define IP6_ADD_STATS(net, idev,field,val) \
174 _DEVADD(net, ipv6, , idev, field, val)
175 #define __IP6_ADD_STATS(net, idev,field,val) \
176 _DEVADD(net, ipv6, __, idev, field, val)
177 #define IP6_UPD_PO_STATS(net, idev,field,val) \
178 _DEVUPD(net, ipv6, , idev, field, val)
179 #define __IP6_UPD_PO_STATS(net, idev,field,val) \
180 _DEVUPD(net, ipv6, __, idev, field, val)
181 #define ICMP6_INC_STATS(net, idev, field) \
182 _DEVINCATOMIC(net, icmpv6, , idev, field)
183 #define __ICMP6_INC_STATS(net, idev, field) \
184 _DEVINCATOMIC(net, icmpv6, __, idev, field)
185
186 #define ICMP6MSGOUT_INC_STATS(net, idev, field) \
187 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
188 #define ICMP6MSGIN_INC_STATS(net, idev, field) \
189 _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
190
191 struct ip6_ra_chain {
192 struct ip6_ra_chain *next;
193 struct sock *sk;
194 int sel;
195 void (*destructor)(struct sock *);
196 };
197
198 extern struct ip6_ra_chain *ip6_ra_chain;
199 extern rwlock_t ip6_ra_lock;
200
201 /*
202 This structure is prepared by protocol, when parsing
203 ancillary data and passed to IPv6.
204 */
205
206 struct ipv6_txoptions {
207 refcount_t refcnt;
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 struct rcu_head rcu;
221 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
222 };
223
224 struct 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
249 struct ipv6_fl_socklist {
250 struct ipv6_fl_socklist __rcu *next;
251 struct ip6_flowlabel *fl;
252 struct rcu_head rcu;
253 };
254
255 struct ipcm6_cookie {
256 __s16 hlimit;
257 __s16 tclass;
258 __s8 dontfrag;
259 struct ipv6_txoptions *opt;
260 };
261
txopt_get(const struct ipv6_pinfo * np)262 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
263 {
264 struct ipv6_txoptions *opt;
265
266 rcu_read_lock();
267 opt = rcu_dereference(np->opt);
268 if (opt) {
269 if (!refcount_inc_not_zero(&opt->refcnt))
270 opt = NULL;
271 else
272 opt = rcu_pointer_handoff(opt);
273 }
274 rcu_read_unlock();
275 return opt;
276 }
277
txopt_put(struct ipv6_txoptions * opt)278 static inline void txopt_put(struct ipv6_txoptions *opt)
279 {
280 if (opt && refcount_dec_and_test(&opt->refcnt))
281 kfree_rcu(opt, rcu);
282 }
283
284 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
285 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
286 struct ip6_flowlabel *fl,
287 struct ipv6_txoptions *fopt);
288 void fl6_free_socklist(struct sock *sk);
289 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
290 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
291 int flags);
292 int ip6_flowlabel_init(void);
293 void ip6_flowlabel_cleanup(void);
294 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
295
fl6_sock_release(struct ip6_flowlabel * fl)296 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
297 {
298 if (fl)
299 atomic_dec(&fl->users);
300 }
301
302 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
303
304 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
305 struct icmp6hdr *thdr, int len);
306
307 int ip6_ra_control(struct sock *sk, int sel);
308
309 int ipv6_parse_hopopts(struct sk_buff *skb);
310
311 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
312 struct ipv6_txoptions *opt);
313 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
314 struct ipv6_txoptions *opt,
315 int newtype,
316 struct ipv6_opt_hdr *newopt);
317 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
318 struct ipv6_txoptions *opt);
319
320 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
321 const struct inet6_skb_parm *opt);
322 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
323 struct ipv6_txoptions *opt);
324
ipv6_accept_ra(struct inet6_dev * idev)325 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
326 {
327 /* If forwarding is enabled, RA are not accepted unless the special
328 * hybrid mode (accept_ra=2) is enabled.
329 */
330 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
331 idev->cnf.accept_ra;
332 }
333
334 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
335 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
336 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
337
338 int __ipv6_addr_type(const struct in6_addr *addr);
ipv6_addr_type(const struct in6_addr * addr)339 static inline int ipv6_addr_type(const struct in6_addr *addr)
340 {
341 return __ipv6_addr_type(addr) & 0xffff;
342 }
343
ipv6_addr_scope(const struct in6_addr * addr)344 static inline int ipv6_addr_scope(const struct in6_addr *addr)
345 {
346 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
347 }
348
__ipv6_addr_src_scope(int type)349 static inline int __ipv6_addr_src_scope(int type)
350 {
351 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
352 }
353
ipv6_addr_src_scope(const struct in6_addr * addr)354 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
355 {
356 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
357 }
358
__ipv6_addr_needs_scope_id(int type)359 static inline bool __ipv6_addr_needs_scope_id(int type)
360 {
361 return type & IPV6_ADDR_LINKLOCAL ||
362 (type & IPV6_ADDR_MULTICAST &&
363 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
364 }
365
ipv6_iface_scope_id(const struct in6_addr * addr,int iface)366 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
367 {
368 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
369 }
370
ipv6_addr_cmp(const struct in6_addr * a1,const struct in6_addr * a2)371 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
372 {
373 return memcmp(a1, a2, sizeof(struct in6_addr));
374 }
375
376 static inline bool
ipv6_masked_addr_cmp(const struct in6_addr * a1,const struct in6_addr * m,const struct in6_addr * a2)377 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
378 const struct in6_addr *a2)
379 {
380 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
381 const unsigned long *ul1 = (const unsigned long *)a1;
382 const unsigned long *ulm = (const unsigned long *)m;
383 const unsigned long *ul2 = (const unsigned long *)a2;
384
385 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
386 ((ul1[1] ^ ul2[1]) & ulm[1]));
387 #else
388 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
389 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
390 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
391 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
392 #endif
393 }
394
ipv6_addr_prefix(struct in6_addr * pfx,const struct in6_addr * addr,int plen)395 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
396 const struct in6_addr *addr,
397 int plen)
398 {
399 /* caller must guarantee 0 <= plen <= 128 */
400 int o = plen >> 3,
401 b = plen & 0x7;
402
403 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
404 memcpy(pfx->s6_addr, addr, o);
405 if (b != 0)
406 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
407 }
408
ipv6_addr_prefix_copy(struct in6_addr * addr,const struct in6_addr * pfx,int plen)409 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
410 const struct in6_addr *pfx,
411 int plen)
412 {
413 /* caller must guarantee 0 <= plen <= 128 */
414 int o = plen >> 3,
415 b = plen & 0x7;
416
417 memcpy(addr->s6_addr, pfx, o);
418 if (b != 0) {
419 addr->s6_addr[o] &= ~(0xff00 >> b);
420 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
421 }
422 }
423
__ipv6_addr_set_half(__be32 * addr,__be32 wh,__be32 wl)424 static inline void __ipv6_addr_set_half(__be32 *addr,
425 __be32 wh, __be32 wl)
426 {
427 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
428 #if defined(__BIG_ENDIAN)
429 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
430 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
431 return;
432 }
433 #elif defined(__LITTLE_ENDIAN)
434 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
435 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
436 return;
437 }
438 #endif
439 #endif
440 addr[0] = wh;
441 addr[1] = wl;
442 }
443
ipv6_addr_set(struct in6_addr * addr,__be32 w1,__be32 w2,__be32 w3,__be32 w4)444 static inline void ipv6_addr_set(struct in6_addr *addr,
445 __be32 w1, __be32 w2,
446 __be32 w3, __be32 w4)
447 {
448 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
449 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
450 }
451
ipv6_addr_equal(const struct in6_addr * a1,const struct in6_addr * a2)452 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
453 const struct in6_addr *a2)
454 {
455 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
456 const unsigned long *ul1 = (const unsigned long *)a1;
457 const unsigned long *ul2 = (const unsigned long *)a2;
458
459 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
460 #else
461 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
462 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
463 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
464 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
465 #endif
466 }
467
468 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
__ipv6_prefix_equal64_half(const __be64 * a1,const __be64 * a2,unsigned int len)469 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
470 const __be64 *a2,
471 unsigned int len)
472 {
473 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
474 return false;
475 return true;
476 }
477
ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)478 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
479 const struct in6_addr *addr2,
480 unsigned int prefixlen)
481 {
482 const __be64 *a1 = (const __be64 *)addr1;
483 const __be64 *a2 = (const __be64 *)addr2;
484
485 if (prefixlen >= 64) {
486 if (a1[0] ^ a2[0])
487 return false;
488 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
489 }
490 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
491 }
492 #else
ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)493 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
494 const struct in6_addr *addr2,
495 unsigned int prefixlen)
496 {
497 const __be32 *a1 = addr1->s6_addr32;
498 const __be32 *a2 = addr2->s6_addr32;
499 unsigned int pdw, pbi;
500
501 /* check complete u32 in prefix */
502 pdw = prefixlen >> 5;
503 if (pdw && memcmp(a1, a2, pdw << 2))
504 return false;
505
506 /* check incomplete u32 in prefix */
507 pbi = prefixlen & 0x1f;
508 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
509 return false;
510
511 return true;
512 }
513 #endif
514
ipv6_addr_any(const struct in6_addr * a)515 static inline bool ipv6_addr_any(const struct in6_addr *a)
516 {
517 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
518 const unsigned long *ul = (const unsigned long *)a;
519
520 return (ul[0] | ul[1]) == 0UL;
521 #else
522 return (a->s6_addr32[0] | a->s6_addr32[1] |
523 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
524 #endif
525 }
526
ipv6_addr_hash(const struct in6_addr * a)527 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
528 {
529 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
530 const unsigned long *ul = (const unsigned long *)a;
531 unsigned long x = ul[0] ^ ul[1];
532
533 return (u32)(x ^ (x >> 32));
534 #else
535 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
536 a->s6_addr32[2] ^ a->s6_addr32[3]);
537 #endif
538 }
539
540 /* more secured version of ipv6_addr_hash() */
__ipv6_addr_jhash(const struct in6_addr * a,const u32 initval)541 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
542 {
543 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
544
545 return jhash_3words(v,
546 (__force u32)a->s6_addr32[2],
547 (__force u32)a->s6_addr32[3],
548 initval);
549 }
550
ipv6_addr_loopback(const struct in6_addr * a)551 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
552 {
553 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
554 const __be64 *be = (const __be64 *)a;
555
556 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
557 #else
558 return (a->s6_addr32[0] | a->s6_addr32[1] |
559 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
560 #endif
561 }
562
563 /*
564 * Note that we must __force cast these to unsigned long to make sparse happy,
565 * since all of the endian-annotated types are fixed size regardless of arch.
566 */
ipv6_addr_v4mapped(const struct in6_addr * a)567 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
568 {
569 return (
570 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
571 *(unsigned long *)a |
572 #else
573 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
574 #endif
575 (__force unsigned long)(a->s6_addr32[2] ^
576 cpu_to_be32(0x0000ffff))) == 0UL;
577 }
578
579 /*
580 * Check for a RFC 4843 ORCHID address
581 * (Overlay Routable Cryptographic Hash Identifiers)
582 */
ipv6_addr_orchid(const struct in6_addr * a)583 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
584 {
585 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
586 }
587
ipv6_addr_is_multicast(const struct in6_addr * addr)588 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
589 {
590 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
591 }
592
ipv6_addr_set_v4mapped(const __be32 addr,struct in6_addr * v4mapped)593 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
594 struct in6_addr *v4mapped)
595 {
596 ipv6_addr_set(v4mapped,
597 0, 0,
598 htonl(0x0000FFFF),
599 addr);
600 }
601
602 /*
603 * find the first different bit between two addresses
604 * length of address must be a multiple of 32bits
605 */
__ipv6_addr_diff32(const void * token1,const void * token2,int addrlen)606 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
607 {
608 const __be32 *a1 = token1, *a2 = token2;
609 int i;
610
611 addrlen >>= 2;
612
613 for (i = 0; i < addrlen; i++) {
614 __be32 xb = a1[i] ^ a2[i];
615 if (xb)
616 return i * 32 + 31 - __fls(ntohl(xb));
617 }
618
619 /*
620 * we should *never* get to this point since that
621 * would mean the addrs are equal
622 *
623 * However, we do get to it 8) And exacly, when
624 * addresses are equal 8)
625 *
626 * ip route add 1111::/128 via ...
627 * ip route add 1111::/64 via ...
628 * and we are here.
629 *
630 * Ideally, this function should stop comparison
631 * at prefix length. It does not, but it is still OK,
632 * if returned value is greater than prefix length.
633 * --ANK (980803)
634 */
635 return addrlen << 5;
636 }
637
638 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
__ipv6_addr_diff64(const void * token1,const void * token2,int addrlen)639 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
640 {
641 const __be64 *a1 = token1, *a2 = token2;
642 int i;
643
644 addrlen >>= 3;
645
646 for (i = 0; i < addrlen; i++) {
647 __be64 xb = a1[i] ^ a2[i];
648 if (xb)
649 return i * 64 + 63 - __fls(be64_to_cpu(xb));
650 }
651
652 return addrlen << 6;
653 }
654 #endif
655
__ipv6_addr_diff(const void * token1,const void * token2,int addrlen)656 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
657 {
658 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
659 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
660 return __ipv6_addr_diff64(token1, token2, addrlen);
661 #endif
662 return __ipv6_addr_diff32(token1, token2, addrlen);
663 }
664
ipv6_addr_diff(const struct in6_addr * a1,const struct in6_addr * a2)665 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
666 {
667 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
668 }
669
670 __be32 ipv6_select_ident(struct net *net,
671 const struct in6_addr *daddr,
672 const struct in6_addr *saddr);
673 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
674
675 int ip6_dst_hoplimit(struct dst_entry *dst);
676
ip6_sk_dst_hoplimit(struct ipv6_pinfo * np,struct flowi6 * fl6,struct dst_entry * dst)677 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
678 struct dst_entry *dst)
679 {
680 int hlimit;
681
682 if (ipv6_addr_is_multicast(&fl6->daddr))
683 hlimit = np->mcast_hops;
684 else
685 hlimit = np->hop_limit;
686 if (hlimit < 0)
687 hlimit = ip6_dst_hoplimit(dst);
688 return hlimit;
689 }
690
691 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
692 * Equivalent to : flow->v6addrs.src = iph->saddr;
693 * flow->v6addrs.dst = iph->daddr;
694 */
iph_to_flow_copy_v6addrs(struct flow_keys * flow,const struct ipv6hdr * iph)695 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
696 const struct ipv6hdr *iph)
697 {
698 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
699 offsetof(typeof(flow->addrs), v6addrs.src) +
700 sizeof(flow->addrs.v6addrs.src));
701 memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
702 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
703 }
704
705 #if IS_ENABLED(CONFIG_IPV6)
706
707 /* Sysctl settings for net ipv6.auto_flowlabels */
708 #define IP6_AUTO_FLOW_LABEL_OFF 0
709 #define IP6_AUTO_FLOW_LABEL_OPTOUT 1
710 #define IP6_AUTO_FLOW_LABEL_OPTIN 2
711 #define IP6_AUTO_FLOW_LABEL_FORCED 3
712
713 #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
714
715 #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
716
ip6_make_flowlabel(struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel,struct flowi6 * fl6)717 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
718 __be32 flowlabel, bool autolabel,
719 struct flowi6 *fl6)
720 {
721 u32 hash;
722
723 /* @flowlabel may include more than a flow label, eg, the traffic class.
724 * Here we want only the flow label value.
725 */
726 flowlabel &= IPV6_FLOWLABEL_MASK;
727
728 if (flowlabel ||
729 net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
730 (!autolabel &&
731 net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
732 return flowlabel;
733
734 hash = skb_get_hash_flowi6(skb, fl6);
735
736 /* Since this is being sent on the wire obfuscate hash a bit
737 * to minimize possbility that any useful information to an
738 * attacker is leaked. Only lower 20 bits are relevant.
739 */
740 hash = rol32(hash, 16);
741
742 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
743
744 if (net->ipv6.sysctl.flowlabel_state_ranges)
745 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
746
747 return flowlabel;
748 }
749
ip6_default_np_autolabel(struct net * net)750 static inline int ip6_default_np_autolabel(struct net *net)
751 {
752 switch (net->ipv6.sysctl.auto_flowlabels) {
753 case IP6_AUTO_FLOW_LABEL_OFF:
754 case IP6_AUTO_FLOW_LABEL_OPTIN:
755 default:
756 return 0;
757 case IP6_AUTO_FLOW_LABEL_OPTOUT:
758 case IP6_AUTO_FLOW_LABEL_FORCED:
759 return 1;
760 }
761 }
762 #else
ip6_set_txhash(struct sock * sk)763 static inline void ip6_set_txhash(struct sock *sk) { }
ip6_make_flowlabel(struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel,struct flowi6 * fl6)764 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
765 __be32 flowlabel, bool autolabel,
766 struct flowi6 *fl6)
767 {
768 return flowlabel;
769 }
ip6_default_np_autolabel(struct net * net)770 static inline int ip6_default_np_autolabel(struct net *net)
771 {
772 return 0;
773 }
774 #endif
775
776
777 /*
778 * Header manipulation
779 */
ip6_flow_hdr(struct ipv6hdr * hdr,unsigned int tclass,__be32 flowlabel)780 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
781 __be32 flowlabel)
782 {
783 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
784 }
785
ip6_flowinfo(const struct ipv6hdr * hdr)786 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
787 {
788 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
789 }
790
ip6_flowlabel(const struct ipv6hdr * hdr)791 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
792 {
793 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
794 }
795
ip6_tclass(__be32 flowinfo)796 static inline u8 ip6_tclass(__be32 flowinfo)
797 {
798 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
799 }
800
ip6_make_flowinfo(unsigned int tclass,__be32 flowlabel)801 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
802 {
803 return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
804 }
805
flowi6_get_flowlabel(const struct flowi6 * fl6)806 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
807 {
808 return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
809 }
810
811 /*
812 * Prototypes exported by ipv6
813 */
814
815 /*
816 * rcv function (called from netdevice level)
817 */
818
819 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
820 struct packet_type *pt, struct net_device *orig_dev);
821
822 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
823
824 /*
825 * upper-layer output functions
826 */
827 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
828 __u32 mark, struct ipv6_txoptions *opt, int tclass);
829
830 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
831
832 int ip6_append_data(struct sock *sk,
833 int getfrag(void *from, char *to, int offset, int len,
834 int odd, struct sk_buff *skb),
835 void *from, int length, int transhdrlen,
836 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
837 struct rt6_info *rt, unsigned int flags,
838 const struct sockcm_cookie *sockc);
839
840 int ip6_push_pending_frames(struct sock *sk);
841
842 void ip6_flush_pending_frames(struct sock *sk);
843
844 int ip6_send_skb(struct sk_buff *skb);
845
846 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
847 struct inet_cork_full *cork,
848 struct inet6_cork *v6_cork);
849 struct sk_buff *ip6_make_skb(struct sock *sk,
850 int getfrag(void *from, char *to, int offset,
851 int len, int odd, struct sk_buff *skb),
852 void *from, int length, int transhdrlen,
853 struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
854 struct rt6_info *rt, unsigned int flags,
855 const struct sockcm_cookie *sockc);
856
ip6_finish_skb(struct sock * sk)857 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
858 {
859 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
860 &inet6_sk(sk)->cork);
861 }
862
863 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
864 struct flowi6 *fl6);
865 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
866 const struct in6_addr *final_dst);
867 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
868 const struct in6_addr *final_dst);
869 struct dst_entry *ip6_blackhole_route(struct net *net,
870 struct dst_entry *orig_dst);
871
872 /*
873 * skb processing functions
874 */
875
876 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
877 int ip6_forward(struct sk_buff *skb);
878 int ip6_input(struct sk_buff *skb);
879 int ip6_mc_input(struct sk_buff *skb);
880
881 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
882 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
883
884 /*
885 * Extension header (options) processing
886 */
887
888 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
889 u8 *proto, struct in6_addr **daddr_p,
890 struct in6_addr *saddr);
891 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
892 u8 *proto);
893
894 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
895 __be16 *frag_offp);
896
897 bool ipv6_ext_hdr(u8 nexthdr);
898
899 enum {
900 IP6_FH_F_FRAG = (1 << 0),
901 IP6_FH_F_AUTH = (1 << 1),
902 IP6_FH_F_SKIP_RH = (1 << 2),
903 };
904
905 /* find specified header and get offset to it */
906 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
907 unsigned short *fragoff, int *fragflg);
908
909 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
910
911 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
912 const struct ipv6_txoptions *opt,
913 struct in6_addr *orig);
914
915 /*
916 * socket options (ipv6_sockglue.c)
917 */
918
919 int ipv6_setsockopt(struct sock *sk, int level, int optname,
920 char __user *optval, unsigned int optlen);
921 int ipv6_getsockopt(struct sock *sk, int level, int optname,
922 char __user *optval, int __user *optlen);
923 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
924 char __user *optval, unsigned int optlen);
925 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
926 char __user *optval, int __user *optlen);
927
928 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
929 int addr_len);
930 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
931 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
932 int addr_len);
933 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
934 void ip6_datagram_release_cb(struct sock *sk);
935
936 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
937 int *addr_len);
938 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
939 int *addr_len);
940 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
941 u32 info, u8 *payload);
942 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
943 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
944
945 int inet6_release(struct socket *sock);
946 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
947 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
948 int peer);
949 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
950
951 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
952 struct sock *sk);
953
954 /*
955 * reassembly.c
956 */
957 extern const struct proto_ops inet6_stream_ops;
958 extern const struct proto_ops inet6_dgram_ops;
959 extern const struct proto_ops inet6_sockraw_ops;
960
961 struct group_source_req;
962 struct group_filter;
963
964 int ip6_mc_source(int add, int omode, struct sock *sk,
965 struct group_source_req *pgsr);
966 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
967 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
968 struct group_filter __user *optval, int __user *optlen);
969
970 #ifdef CONFIG_PROC_FS
971 int ac6_proc_init(struct net *net);
972 void ac6_proc_exit(struct net *net);
973 int raw6_proc_init(void);
974 void raw6_proc_exit(void);
975 int tcp6_proc_init(struct net *net);
976 void tcp6_proc_exit(struct net *net);
977 int udp6_proc_init(struct net *net);
978 void udp6_proc_exit(struct net *net);
979 int udplite6_proc_init(void);
980 void udplite6_proc_exit(void);
981 int ipv6_misc_proc_init(void);
982 void ipv6_misc_proc_exit(void);
983 int snmp6_register_dev(struct inet6_dev *idev);
984 int snmp6_unregister_dev(struct inet6_dev *idev);
985
986 #else
ac6_proc_init(struct net * net)987 static inline int ac6_proc_init(struct net *net) { return 0; }
ac6_proc_exit(struct net * net)988 static inline void ac6_proc_exit(struct net *net) { }
snmp6_register_dev(struct inet6_dev * idev)989 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
snmp6_unregister_dev(struct inet6_dev * idev)990 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
991 #endif
992
993 #ifdef CONFIG_SYSCTL
994 extern struct ctl_table ipv6_route_table_template[];
995
996 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
997 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
998 int ipv6_sysctl_register(void);
999 void ipv6_sysctl_unregister(void);
1000 #endif
1001
1002 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1003 const struct in6_addr *addr);
1004 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1005 const struct in6_addr *addr);
1006 #endif /* _NET_IPV6_H */
1007