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_keys.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
105 struct 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 */
121 extern int sysctl_mld_max_msf;
122 extern 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
192 struct ip6_ra_chain {
193 struct ip6_ra_chain *next;
194 struct sock *sk;
195 int sel;
196 void (*destructor)(struct sock *);
197 };
198
199 extern struct ip6_ra_chain *ip6_ra_chain;
200 extern 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
207 struct ipv6_txoptions {
208 atomic_t refcnt;
209 /* Length of this structure */
210 int tot_len;
211
212 /* length of extension headers */
213
214 __u16 opt_flen; /* after fragment hdr */
215 __u16 opt_nflen; /* before fragment hdr */
216
217 struct ipv6_opt_hdr *hopopt;
218 struct ipv6_opt_hdr *dst0opt;
219 struct ipv6_rt_hdr *srcrt; /* Routing Header */
220 struct ipv6_opt_hdr *dst1opt;
221 struct rcu_head rcu;
222 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
223 };
224
225 struct ip6_flowlabel {
226 struct ip6_flowlabel __rcu *next;
227 __be32 label;
228 atomic_t users;
229 struct in6_addr dst;
230 struct ipv6_txoptions *opt;
231 unsigned long linger;
232 struct rcu_head rcu;
233 u8 share;
234 union {
235 struct pid *pid;
236 kuid_t uid;
237 } owner;
238 unsigned long lastuse;
239 unsigned long expires;
240 struct net *fl_net;
241 };
242
243 #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
244 #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
245 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246 #define IPV6_TCLASS_SHIFT 20
247
248 struct ipv6_fl_socklist {
249 struct ipv6_fl_socklist __rcu *next;
250 struct ip6_flowlabel *fl;
251 struct rcu_head rcu;
252 };
253
txopt_get(const struct ipv6_pinfo * np)254 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
255 {
256 struct ipv6_txoptions *opt;
257
258 rcu_read_lock();
259 opt = rcu_dereference(np->opt);
260 if (opt && !atomic_inc_not_zero(&opt->refcnt))
261 opt = NULL;
262 rcu_read_unlock();
263 return opt;
264 }
265
txopt_put(struct ipv6_txoptions * opt)266 static inline void txopt_put(struct ipv6_txoptions *opt)
267 {
268 if (opt && atomic_dec_and_test(&opt->refcnt))
269 kfree_rcu(opt, rcu);
270 }
271
272 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
273 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
274 struct ip6_flowlabel *fl,
275 struct ipv6_txoptions *fopt);
276 void fl6_free_socklist(struct sock *sk);
277 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
278 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
279 int flags);
280 int ip6_flowlabel_init(void);
281 void ip6_flowlabel_cleanup(void);
282
fl6_sock_release(struct ip6_flowlabel * fl)283 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
284 {
285 if (fl)
286 atomic_dec(&fl->users);
287 }
288
289 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
290
291 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
292 struct icmp6hdr *thdr, int len);
293
294 int ip6_ra_control(struct sock *sk, int sel);
295
296 int ipv6_parse_hopopts(struct sk_buff *skb);
297
298 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
299 struct ipv6_txoptions *opt);
300 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
301 struct ipv6_txoptions *opt,
302 int newtype,
303 struct ipv6_opt_hdr __user *newopt,
304 int newoptlen);
305 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
306 struct ipv6_txoptions *opt);
307
308 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
309 const struct inet6_skb_parm *opt);
310
ipv6_accept_ra(struct inet6_dev * idev)311 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
312 {
313 /* If forwarding is enabled, RA are not accepted unless the special
314 * hybrid mode (accept_ra=2) is enabled.
315 */
316 return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
317 idev->cnf.accept_ra;
318 }
319
320 #if IS_ENABLED(CONFIG_IPV6)
ip6_frag_mem(struct net * net)321 static inline int ip6_frag_mem(struct net *net)
322 {
323 return sum_frag_mem_limit(&net->ipv6.frags);
324 }
325 #endif
326
327 #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
328 #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
329 #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
330
331 int __ipv6_addr_type(const struct in6_addr *addr);
ipv6_addr_type(const struct in6_addr * addr)332 static inline int ipv6_addr_type(const struct in6_addr *addr)
333 {
334 return __ipv6_addr_type(addr) & 0xffff;
335 }
336
ipv6_addr_scope(const struct in6_addr * addr)337 static inline int ipv6_addr_scope(const struct in6_addr *addr)
338 {
339 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
340 }
341
__ipv6_addr_src_scope(int type)342 static inline int __ipv6_addr_src_scope(int type)
343 {
344 return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
345 }
346
ipv6_addr_src_scope(const struct in6_addr * addr)347 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
348 {
349 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
350 }
351
__ipv6_addr_needs_scope_id(int type)352 static inline bool __ipv6_addr_needs_scope_id(int type)
353 {
354 return type & IPV6_ADDR_LINKLOCAL ||
355 (type & IPV6_ADDR_MULTICAST &&
356 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
357 }
358
ipv6_iface_scope_id(const struct in6_addr * addr,int iface)359 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
360 {
361 return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
362 }
363
ipv6_addr_cmp(const struct in6_addr * a1,const struct in6_addr * a2)364 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
365 {
366 return memcmp(a1, a2, sizeof(struct in6_addr));
367 }
368
369 static inline bool
ipv6_masked_addr_cmp(const struct in6_addr * a1,const struct in6_addr * m,const struct in6_addr * a2)370 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
371 const struct in6_addr *a2)
372 {
373 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
374 const unsigned long *ul1 = (const unsigned long *)a1;
375 const unsigned long *ulm = (const unsigned long *)m;
376 const unsigned long *ul2 = (const unsigned long *)a2;
377
378 return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
379 ((ul1[1] ^ ul2[1]) & ulm[1]));
380 #else
381 return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
382 ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
383 ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
384 ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
385 #endif
386 }
387
ipv6_addr_prefix(struct in6_addr * pfx,const struct in6_addr * addr,int plen)388 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
389 const struct in6_addr *addr,
390 int plen)
391 {
392 /* caller must guarantee 0 <= plen <= 128 */
393 int o = plen >> 3,
394 b = plen & 0x7;
395
396 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
397 memcpy(pfx->s6_addr, addr, o);
398 if (b != 0)
399 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
400 }
401
__ipv6_addr_set_half(__be32 * addr,__be32 wh,__be32 wl)402 static inline void __ipv6_addr_set_half(__be32 *addr,
403 __be32 wh, __be32 wl)
404 {
405 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
406 #if defined(__BIG_ENDIAN)
407 if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
408 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
409 return;
410 }
411 #elif defined(__LITTLE_ENDIAN)
412 if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
413 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
414 return;
415 }
416 #endif
417 #endif
418 addr[0] = wh;
419 addr[1] = wl;
420 }
421
ipv6_addr_set(struct in6_addr * addr,__be32 w1,__be32 w2,__be32 w3,__be32 w4)422 static inline void ipv6_addr_set(struct in6_addr *addr,
423 __be32 w1, __be32 w2,
424 __be32 w3, __be32 w4)
425 {
426 __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
427 __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
428 }
429
ipv6_addr_equal(const struct in6_addr * a1,const struct in6_addr * a2)430 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
431 const struct in6_addr *a2)
432 {
433 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
434 const unsigned long *ul1 = (const unsigned long *)a1;
435 const unsigned long *ul2 = (const unsigned long *)a2;
436
437 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
438 #else
439 return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
440 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
441 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
442 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
443 #endif
444 }
445
446 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
__ipv6_prefix_equal64_half(const __be64 * a1,const __be64 * a2,unsigned int len)447 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
448 const __be64 *a2,
449 unsigned int len)
450 {
451 if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
452 return false;
453 return true;
454 }
455
ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)456 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
457 const struct in6_addr *addr2,
458 unsigned int prefixlen)
459 {
460 const __be64 *a1 = (const __be64 *)addr1;
461 const __be64 *a2 = (const __be64 *)addr2;
462
463 if (prefixlen >= 64) {
464 if (a1[0] ^ a2[0])
465 return false;
466 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
467 }
468 return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
469 }
470 #else
ipv6_prefix_equal(const struct in6_addr * addr1,const struct in6_addr * addr2,unsigned int prefixlen)471 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
472 const struct in6_addr *addr2,
473 unsigned int prefixlen)
474 {
475 const __be32 *a1 = addr1->s6_addr32;
476 const __be32 *a2 = addr2->s6_addr32;
477 unsigned int pdw, pbi;
478
479 /* check complete u32 in prefix */
480 pdw = prefixlen >> 5;
481 if (pdw && memcmp(a1, a2, pdw << 2))
482 return false;
483
484 /* check incomplete u32 in prefix */
485 pbi = prefixlen & 0x1f;
486 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
487 return false;
488
489 return true;
490 }
491 #endif
492
493 struct inet_frag_queue;
494
495 enum ip6_defrag_users {
496 IP6_DEFRAG_LOCAL_DELIVER,
497 IP6_DEFRAG_CONNTRACK_IN,
498 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
499 IP6_DEFRAG_CONNTRACK_OUT,
500 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
501 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
502 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
503 };
504
505 struct ip6_create_arg {
506 __be32 id;
507 u32 user;
508 const struct in6_addr *src;
509 const struct in6_addr *dst;
510 int iif;
511 u8 ecn;
512 };
513
514 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
515 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
516
517 /*
518 * Equivalent of ipv4 struct ip
519 */
520 struct frag_queue {
521 struct inet_frag_queue q;
522
523 __be32 id; /* fragment id */
524 u32 user;
525 struct in6_addr saddr;
526 struct in6_addr daddr;
527
528 int iif;
529 unsigned int csum;
530 __u16 nhoffset;
531 u8 ecn;
532 };
533
534 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
535 struct inet_frags *frags);
536
ipv6_addr_any(const struct in6_addr * a)537 static inline bool ipv6_addr_any(const struct in6_addr *a)
538 {
539 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
540 const unsigned long *ul = (const unsigned long *)a;
541
542 return (ul[0] | ul[1]) == 0UL;
543 #else
544 return (a->s6_addr32[0] | a->s6_addr32[1] |
545 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
546 #endif
547 }
548
ipv6_addr_hash(const struct in6_addr * a)549 static inline u32 ipv6_addr_hash(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 unsigned long x = ul[0] ^ ul[1];
554
555 return (u32)(x ^ (x >> 32));
556 #else
557 return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
558 a->s6_addr32[2] ^ a->s6_addr32[3]);
559 #endif
560 }
561
562 /* more secured version of ipv6_addr_hash() */
__ipv6_addr_jhash(const struct in6_addr * a,const u32 initval)563 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
564 {
565 u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
566
567 return jhash_3words(v,
568 (__force u32)a->s6_addr32[2],
569 (__force u32)a->s6_addr32[3],
570 initval);
571 }
572
ipv6_addr_loopback(const struct in6_addr * a)573 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
574 {
575 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
576 const __be64 *be = (const __be64 *)a;
577
578 return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
579 #else
580 return (a->s6_addr32[0] | a->s6_addr32[1] |
581 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
582 #endif
583 }
584
585 /*
586 * Note that we must __force cast these to unsigned long to make sparse happy,
587 * since all of the endian-annotated types are fixed size regardless of arch.
588 */
ipv6_addr_v4mapped(const struct in6_addr * a)589 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
590 {
591 return (
592 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
593 *(unsigned long *)a |
594 #else
595 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
596 #endif
597 (__force unsigned long)(a->s6_addr32[2] ^
598 cpu_to_be32(0x0000ffff))) == 0UL;
599 }
600
601 /*
602 * Check for a RFC 4843 ORCHID address
603 * (Overlay Routable Cryptographic Hash Identifiers)
604 */
ipv6_addr_orchid(const struct in6_addr * a)605 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
606 {
607 return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
608 }
609
ipv6_addr_is_multicast(const struct in6_addr * addr)610 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
611 {
612 return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
613 }
614
ipv6_addr_set_v4mapped(const __be32 addr,struct in6_addr * v4mapped)615 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
616 struct in6_addr *v4mapped)
617 {
618 ipv6_addr_set(v4mapped,
619 0, 0,
620 htonl(0x0000FFFF),
621 addr);
622 }
623
624 /*
625 * find the first different bit between two addresses
626 * length of address must be a multiple of 32bits
627 */
__ipv6_addr_diff32(const void * token1,const void * token2,int addrlen)628 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
629 {
630 const __be32 *a1 = token1, *a2 = token2;
631 int i;
632
633 addrlen >>= 2;
634
635 for (i = 0; i < addrlen; i++) {
636 __be32 xb = a1[i] ^ a2[i];
637 if (xb)
638 return i * 32 + 31 - __fls(ntohl(xb));
639 }
640
641 /*
642 * we should *never* get to this point since that
643 * would mean the addrs are equal
644 *
645 * However, we do get to it 8) And exacly, when
646 * addresses are equal 8)
647 *
648 * ip route add 1111::/128 via ...
649 * ip route add 1111::/64 via ...
650 * and we are here.
651 *
652 * Ideally, this function should stop comparison
653 * at prefix length. It does not, but it is still OK,
654 * if returned value is greater than prefix length.
655 * --ANK (980803)
656 */
657 return addrlen << 5;
658 }
659
660 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
__ipv6_addr_diff64(const void * token1,const void * token2,int addrlen)661 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
662 {
663 const __be64 *a1 = token1, *a2 = token2;
664 int i;
665
666 addrlen >>= 3;
667
668 for (i = 0; i < addrlen; i++) {
669 __be64 xb = a1[i] ^ a2[i];
670 if (xb)
671 return i * 64 + 63 - __fls(be64_to_cpu(xb));
672 }
673
674 return addrlen << 6;
675 }
676 #endif
677
__ipv6_addr_diff(const void * token1,const void * token2,int addrlen)678 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
679 {
680 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
681 if (__builtin_constant_p(addrlen) && !(addrlen & 7))
682 return __ipv6_addr_diff64(token1, token2, addrlen);
683 #endif
684 return __ipv6_addr_diff32(token1, token2, addrlen);
685 }
686
ipv6_addr_diff(const struct in6_addr * a1,const struct in6_addr * a2)687 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
688 {
689 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
690 }
691
692 void ipv6_select_ident(struct net *net, struct frag_hdr *fhdr,
693 struct rt6_info *rt);
694 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
695
696 int ip6_dst_hoplimit(struct dst_entry *dst);
697
ip6_sk_dst_hoplimit(struct ipv6_pinfo * np,struct flowi6 * fl6,struct dst_entry * dst)698 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
699 struct dst_entry *dst)
700 {
701 int hlimit;
702
703 if (ipv6_addr_is_multicast(&fl6->daddr))
704 hlimit = np->mcast_hops;
705 else
706 hlimit = np->hop_limit;
707 if (hlimit < 0)
708 hlimit = ip6_dst_hoplimit(dst);
709 return hlimit;
710 }
711
712 #if IS_ENABLED(CONFIG_IPV6)
ip6_set_txhash(struct sock * sk)713 static inline void ip6_set_txhash(struct sock *sk)
714 {
715 struct inet_sock *inet = inet_sk(sk);
716 struct ipv6_pinfo *np = inet6_sk(sk);
717 struct flow_keys keys;
718
719 keys.src = (__force __be32)ipv6_addr_hash(&np->saddr);
720 keys.dst = (__force __be32)ipv6_addr_hash(&sk->sk_v6_daddr);
721 keys.port16[0] = inet->inet_sport;
722 keys.port16[1] = inet->inet_dport;
723
724 sk->sk_txhash = flow_hash_from_keys(&keys);
725 }
726
ip6_make_flowlabel(struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel)727 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
728 __be32 flowlabel, bool autolabel)
729 {
730 if (!flowlabel && (autolabel || net->ipv6.sysctl.auto_flowlabels)) {
731 u32 hash;
732
733 hash = skb_get_hash(skb);
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 hash ^= hash >> 12;
740
741 flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
742 }
743
744 return flowlabel;
745 }
746 #else
ip6_set_txhash(struct sock * sk)747 static inline void ip6_set_txhash(struct sock *sk) { }
ip6_make_flowlabel(struct net * net,struct sk_buff * skb,__be32 flowlabel,bool autolabel)748 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
749 __be32 flowlabel, bool autolabel)
750 {
751 return flowlabel;
752 }
753 #endif
754
755
756 /*
757 * Header manipulation
758 */
ip6_flow_hdr(struct ipv6hdr * hdr,unsigned int tclass,__be32 flowlabel)759 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
760 __be32 flowlabel)
761 {
762 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
763 }
764
ip6_flowinfo(const struct ipv6hdr * hdr)765 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
766 {
767 return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
768 }
769
ip6_flowlabel(const struct ipv6hdr * hdr)770 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
771 {
772 return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
773 }
774
ip6_tclass(__be32 flowinfo)775 static inline u8 ip6_tclass(__be32 flowinfo)
776 {
777 return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
778 }
779 /*
780 * Prototypes exported by ipv6
781 */
782
783 /*
784 * rcv function (called from netdevice level)
785 */
786
787 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
788 struct packet_type *pt, struct net_device *orig_dev);
789
790 int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb);
791
792 /*
793 * upper-layer output functions
794 */
795 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
796 struct ipv6_txoptions *opt, int tclass);
797
798 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
799
800 int ip6_append_data(struct sock *sk,
801 int getfrag(void *from, char *to, int offset, int len,
802 int odd, struct sk_buff *skb),
803 void *from, int length, int transhdrlen, int hlimit,
804 int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
805 struct rt6_info *rt, unsigned int flags, int dontfrag);
806
807 int ip6_push_pending_frames(struct sock *sk);
808
809 void ip6_flush_pending_frames(struct sock *sk);
810
811 int ip6_send_skb(struct sk_buff *skb);
812
813 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
814 struct inet_cork_full *cork,
815 struct inet6_cork *v6_cork);
816 struct sk_buff *ip6_make_skb(struct sock *sk,
817 int getfrag(void *from, char *to, int offset,
818 int len, int odd, struct sk_buff *skb),
819 void *from, int length, int transhdrlen,
820 int hlimit, int tclass, struct ipv6_txoptions *opt,
821 struct flowi6 *fl6, struct rt6_info *rt,
822 unsigned int flags, int dontfrag);
823
ip6_finish_skb(struct sock * sk)824 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
825 {
826 return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
827 &inet6_sk(sk)->cork);
828 }
829
830 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
831 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
832 const struct in6_addr *final_dst);
833 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
834 const struct in6_addr *final_dst);
835 struct dst_entry *ip6_blackhole_route(struct net *net,
836 struct dst_entry *orig_dst);
837
838 /*
839 * skb processing functions
840 */
841
842 int ip6_output(struct sock *sk, struct sk_buff *skb);
843 int ip6_forward(struct sk_buff *skb);
844 int ip6_input(struct sk_buff *skb);
845 int ip6_mc_input(struct sk_buff *skb);
846
847 int __ip6_local_out(struct sk_buff *skb);
848 int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb);
849 int ip6_local_out(struct sk_buff *skb);
850
851 /*
852 * Extension header (options) processing
853 */
854
855 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
856 u8 *proto, struct in6_addr **daddr_p);
857 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
858 u8 *proto);
859
860 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
861 __be16 *frag_offp);
862
863 bool ipv6_ext_hdr(u8 nexthdr);
864
865 enum {
866 IP6_FH_F_FRAG = (1 << 0),
867 IP6_FH_F_AUTH = (1 << 1),
868 IP6_FH_F_SKIP_RH = (1 << 2),
869 };
870
871 /* find specified header and get offset to it */
872 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
873 unsigned short *fragoff, int *fragflg);
874
875 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
876
877 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
878 const struct ipv6_txoptions *opt,
879 struct in6_addr *orig);
880
881 /*
882 * socket options (ipv6_sockglue.c)
883 */
884
885 int ipv6_setsockopt(struct sock *sk, int level, int optname,
886 char __user *optval, unsigned int optlen);
887 int ipv6_getsockopt(struct sock *sk, int level, int optname,
888 char __user *optval, int __user *optlen);
889 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
890 char __user *optval, unsigned int optlen);
891 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
892 char __user *optval, int __user *optlen);
893
894 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
895 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
896 int addr_len);
897
898 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
899 int *addr_len);
900 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
901 int *addr_len);
902 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
903 u32 info, u8 *payload);
904 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
905 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
906
907 int inet6_release(struct socket *sock);
908 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
909 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
910 int peer);
911 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
912
913 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
914 struct sock *sk);
915
916 /*
917 * reassembly.c
918 */
919 extern const struct proto_ops inet6_stream_ops;
920 extern const struct proto_ops inet6_dgram_ops;
921
922 struct group_source_req;
923 struct group_filter;
924
925 int ip6_mc_source(int add, int omode, struct sock *sk,
926 struct group_source_req *pgsr);
927 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
928 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
929 struct group_filter __user *optval, int __user *optlen);
930
931 #ifdef CONFIG_PROC_FS
932 int ac6_proc_init(struct net *net);
933 void ac6_proc_exit(struct net *net);
934 int raw6_proc_init(void);
935 void raw6_proc_exit(void);
936 int tcp6_proc_init(struct net *net);
937 void tcp6_proc_exit(struct net *net);
938 int udp6_proc_init(struct net *net);
939 void udp6_proc_exit(struct net *net);
940 int udplite6_proc_init(void);
941 void udplite6_proc_exit(void);
942 int ipv6_misc_proc_init(void);
943 void ipv6_misc_proc_exit(void);
944 int snmp6_register_dev(struct inet6_dev *idev);
945 int snmp6_unregister_dev(struct inet6_dev *idev);
946
947 #else
ac6_proc_init(struct net * net)948 static inline int ac6_proc_init(struct net *net) { return 0; }
ac6_proc_exit(struct net * net)949 static inline void ac6_proc_exit(struct net *net) { }
snmp6_register_dev(struct inet6_dev * idev)950 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
snmp6_unregister_dev(struct inet6_dev * idev)951 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
952 #endif
953
954 #ifdef CONFIG_SYSCTL
955 extern struct ctl_table ipv6_route_table_template[];
956
957 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
958 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
959 int ipv6_sysctl_register(void);
960 void ipv6_sysctl_unregister(void);
961 #endif
962
963 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
964 const struct in6_addr *addr);
965 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
966 const struct in6_addr *addr);
967 #endif /* _NET_IPV6_H */
968