1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ADDRCONF_H
3 #define _ADDRCONF_H
4
5 #define MAX_RTR_SOLICITATIONS -1 /* unlimited */
6 #define RTR_SOLICITATION_INTERVAL (4*HZ)
7 #define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
8
9 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
10
11 #define TEMP_VALID_LIFETIME (7*86400)
12 #define TEMP_PREFERRED_LIFETIME (86400)
13 #define REGEN_MAX_RETRY (3)
14 #define MAX_DESYNC_FACTOR (600)
15
16 #define ADDR_CHECK_FREQUENCY (120*HZ)
17
18 #define IPV6_MAX_ADDRESSES 16
19
20 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
21 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
22 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
23
24 #define ADDRCONF_NOTIFY_PRIORITY 0
25
26 #include <linux/in.h>
27 #include <linux/in6.h>
28
29 struct prefix_info {
30 __u8 type;
31 __u8 length;
32 __u8 prefix_len;
33
34 /*
35 * ANDROID: crc fix for commit 9354e0acdb74 ("net: ipv6: support
36 * reporting otherwise unknown prefix * flags in RTM_NEWPREFIX")
37 */
38 #ifndef __GENKSYMS__
39 union __packed {
40 __u8 flags;
41 struct __packed {
42 #endif
43 #if defined(__BIG_ENDIAN_BITFIELD)
44 __u8 onlink : 1,
45 autoconf : 1,
46 reserved : 6;
47 #elif defined(__LITTLE_ENDIAN_BITFIELD)
48 __u8 reserved : 6,
49 autoconf : 1,
50 onlink : 1;
51 #else
52 #error "Please fix <asm/byteorder.h>"
53 #endif
54 #ifndef __GENKSYMS__
55 };
56 };
57 #endif
58 __be32 valid;
59 __be32 prefered;
60 __be32 reserved2;
61
62 struct in6_addr prefix;
63 };
64
65 /* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
66 static_assert(sizeof(struct prefix_info) == 32);
67
68 #include <linux/ipv6.h>
69 #include <linux/netdevice.h>
70 #include <net/if_inet6.h>
71 #include <net/ipv6.h>
72
73 struct in6_validator_info {
74 struct in6_addr i6vi_addr;
75 struct inet6_dev *i6vi_dev;
76 struct netlink_ext_ack *extack;
77 };
78
79 struct ifa6_config {
80 const struct in6_addr *pfx;
81 unsigned int plen;
82
83 const struct in6_addr *peer_pfx;
84
85 u32 rt_priority;
86 u32 ifa_flags;
87 u32 preferred_lft;
88 u32 valid_lft;
89 u16 scope;
90 };
91
92 int addrconf_init(void);
93 void addrconf_cleanup(void);
94
95 int addrconf_add_ifaddr(struct net *net, void __user *arg);
96 int addrconf_del_ifaddr(struct net *net, void __user *arg);
97 int addrconf_set_dstaddr(struct net *net, void __user *arg);
98
99 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
100 const struct net_device *dev, int strict);
101 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
102 const struct net_device *dev, bool skip_dev_check,
103 int strict, u32 banned_flags);
104
105 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
106 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
107 #endif
108
109 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
110 unsigned char nsegs);
111
112 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
113 const unsigned int prefix_len,
114 struct net_device *dev);
115
116 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
117
118 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
119 struct net_device *dev);
120
121 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
122 const struct in6_addr *addr,
123 struct net_device *dev, int strict);
124
125 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
126 const struct in6_addr *daddr, unsigned int srcprefs,
127 struct in6_addr *saddr);
128 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
129 u32 banned_flags);
130 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
131 u32 banned_flags);
132 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
133 bool match_wildcard);
134 bool inet_rcv_saddr_any(const struct sock *sk);
135 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
136 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
137
138 void addrconf_add_linklocal(struct inet6_dev *idev,
139 const struct in6_addr *addr, u32 flags);
140
141 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
142 const struct prefix_info *pinfo,
143 struct inet6_dev *in6_dev,
144 const struct in6_addr *addr, int addr_type,
145 u32 addr_flags, bool sllao, bool tokenized,
146 __u32 valid_lft, u32 prefered_lft);
147
addrconf_addr_eui48_base(u8 * eui,const char * const addr)148 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
149 {
150 memcpy(eui, addr, 3);
151 eui[3] = 0xFF;
152 eui[4] = 0xFE;
153 memcpy(eui + 5, addr + 3, 3);
154 }
155
addrconf_addr_eui48(u8 * eui,const char * const addr)156 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
157 {
158 addrconf_addr_eui48_base(eui, addr);
159 eui[0] ^= 2;
160 }
161
addrconf_ifid_eui48(u8 * eui,struct net_device * dev)162 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
163 {
164 if (dev->addr_len != ETH_ALEN)
165 return -1;
166
167 /*
168 * The zSeries OSA network cards can be shared among various
169 * OS instances, but the OSA cards have only one MAC address.
170 * This leads to duplicate address conflicts in conjunction
171 * with IPv6 if more than one instance uses the same card.
172 *
173 * The driver for these cards can deliver a unique 16-bit
174 * identifier for each instance sharing the same card. It is
175 * placed instead of 0xFFFE in the interface identifier. The
176 * "u" bit of the interface identifier is not inverted in this
177 * case. Hence the resulting interface identifier has local
178 * scope according to RFC2373.
179 */
180
181 addrconf_addr_eui48_base(eui, dev->dev_addr);
182
183 if (dev->dev_id) {
184 eui[3] = (dev->dev_id >> 8) & 0xFF;
185 eui[4] = dev->dev_id & 0xFF;
186 } else {
187 eui[0] ^= 2;
188 }
189
190 return 0;
191 }
192
addrconf_timeout_fixup(u32 timeout,unsigned int unit)193 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
194 unsigned int unit)
195 {
196 if (timeout == 0xffffffff)
197 return ~0UL;
198
199 /*
200 * Avoid arithmetic overflow.
201 * Assuming unit is constant and non-zero, this "if" statement
202 * will go away on 64bit archs.
203 */
204 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
205 return LONG_MAX / unit;
206
207 return timeout;
208 }
209
addrconf_finite_timeout(unsigned long timeout)210 static inline int addrconf_finite_timeout(unsigned long timeout)
211 {
212 return ~timeout;
213 }
214
215 /*
216 * IPv6 Address Label subsystem (addrlabel.c)
217 */
218 int ipv6_addr_label_init(void);
219 void ipv6_addr_label_cleanup(void);
220 int ipv6_addr_label_rtnl_register(void);
221 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
222 int type, int ifindex);
223
224 /*
225 * multicast prototypes (mcast.c)
226 */
ipv6_mc_may_pull(struct sk_buff * skb,unsigned int len)227 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
228 unsigned int len)
229 {
230 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
231 return false;
232
233 return pskb_may_pull(skb, len);
234 }
235
236 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
237 const struct in6_addr *addr);
238 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
239 const struct in6_addr *addr);
240 void __ipv6_sock_mc_close(struct sock *sk);
241 void ipv6_sock_mc_close(struct sock *sk);
242 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
243 const struct in6_addr *src_addr);
244
245 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
246 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
247 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
248 void ipv6_mc_up(struct inet6_dev *idev);
249 void ipv6_mc_down(struct inet6_dev *idev);
250 void ipv6_mc_unmap(struct inet6_dev *idev);
251 void ipv6_mc_remap(struct inet6_dev *idev);
252 void ipv6_mc_init_dev(struct inet6_dev *idev);
253 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
254 int ipv6_mc_check_mld(struct sk_buff *skb);
255 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
256
257 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
258 const struct in6_addr *src_addr);
259
260 void ipv6_mc_dad_complete(struct inet6_dev *idev);
261
262 /*
263 * identify MLD packets for MLD filter exceptions
264 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)265 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
266 {
267 struct icmp6hdr *hdr;
268
269 if (nexthdr != IPPROTO_ICMPV6 ||
270 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
271 return false;
272
273 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
274
275 switch (hdr->icmp6_type) {
276 case ICMPV6_MGM_QUERY:
277 case ICMPV6_MGM_REPORT:
278 case ICMPV6_MGM_REDUCTION:
279 case ICMPV6_MLD2_REPORT:
280 return true;
281 default:
282 break;
283 }
284 return false;
285 }
286
287 void addrconf_prefix_rcv(struct net_device *dev,
288 u8 *opt, int len, bool sllao);
289
290 /* Determines into what table to put autoconf PIO/RIO/default routes
291 * learned on this device.
292 *
293 * - If 0, use the same table for every device. This puts routes into
294 * one of RT_TABLE_{PREFIX,INFO,DFLT} depending on the type of route
295 * (but note that these three are currently all equal to
296 * RT6_TABLE_MAIN).
297 * - If > 0, use the specified table.
298 * - If < 0, put routes into table dev->ifindex + (-rt_table).
299 */
300 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table);
301
302 /*
303 * anycast prototypes (anycast.c)
304 */
305 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
306 const struct in6_addr *addr);
307 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
308 const struct in6_addr *addr);
309 void __ipv6_sock_ac_close(struct sock *sk);
310 void ipv6_sock_ac_close(struct sock *sk);
311
312 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
313 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
314 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
315 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
316 const struct in6_addr *addr);
317 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
318 const struct in6_addr *addr);
319 int ipv6_anycast_init(void);
320 void ipv6_anycast_cleanup(void);
321
322 /* Device notifier */
323 int register_inet6addr_notifier(struct notifier_block *nb);
324 int unregister_inet6addr_notifier(struct notifier_block *nb);
325 int inet6addr_notifier_call_chain(unsigned long val, void *v);
326
327 int register_inet6addr_validator_notifier(struct notifier_block *nb);
328 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
329 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
330
331 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
332 int ifindex, struct ipv6_devconf *devconf);
333
334 /**
335 * __in6_dev_get - get inet6_dev pointer from netdevice
336 * @dev: network device
337 *
338 * Caller must hold rcu_read_lock or RTNL, because this function
339 * does not take a reference on the inet6_dev.
340 */
__in6_dev_get(const struct net_device * dev)341 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
342 {
343 return rcu_dereference_rtnl(dev->ip6_ptr);
344 }
345
346 /**
347 * __in6_dev_stats_get - get inet6_dev pointer for stats
348 * @dev: network device
349 * @skb: skb for original incoming interface if neeeded
350 *
351 * Caller must hold rcu_read_lock or RTNL, because this function
352 * does not take a reference on the inet6_dev.
353 */
__in6_dev_stats_get(const struct net_device * dev,const struct sk_buff * skb)354 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
355 const struct sk_buff *skb)
356 {
357 if (netif_is_l3_master(dev))
358 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
359 return __in6_dev_get(dev);
360 }
361
362 /**
363 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
364 * @dev: network device
365 *
366 * This is a safer version of __in6_dev_get
367 */
__in6_dev_get_safely(const struct net_device * dev)368 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
369 {
370 if (likely(dev))
371 return rcu_dereference_rtnl(dev->ip6_ptr);
372 else
373 return NULL;
374 }
375
376 /**
377 * in6_dev_get - get inet6_dev pointer from netdevice
378 * @dev: network device
379 *
380 * This version can be used in any context, and takes a reference
381 * on the inet6_dev. Callers must use in6_dev_put() later to
382 * release this reference.
383 */
in6_dev_get(const struct net_device * dev)384 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
385 {
386 struct inet6_dev *idev;
387
388 rcu_read_lock();
389 idev = rcu_dereference(dev->ip6_ptr);
390 if (idev)
391 refcount_inc(&idev->refcnt);
392 rcu_read_unlock();
393 return idev;
394 }
395
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)396 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
397 {
398 struct inet6_dev *idev = __in6_dev_get(dev);
399
400 return idev ? idev->nd_parms : NULL;
401 }
402
403 void in6_dev_finish_destroy(struct inet6_dev *idev);
404
in6_dev_put(struct inet6_dev * idev)405 static inline void in6_dev_put(struct inet6_dev *idev)
406 {
407 if (refcount_dec_and_test(&idev->refcnt))
408 in6_dev_finish_destroy(idev);
409 }
410
in6_dev_put_clear(struct inet6_dev ** pidev)411 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
412 {
413 struct inet6_dev *idev = *pidev;
414
415 if (idev) {
416 in6_dev_put(idev);
417 *pidev = NULL;
418 }
419 }
420
__in6_dev_put(struct inet6_dev * idev)421 static inline void __in6_dev_put(struct inet6_dev *idev)
422 {
423 refcount_dec(&idev->refcnt);
424 }
425
in6_dev_hold(struct inet6_dev * idev)426 static inline void in6_dev_hold(struct inet6_dev *idev)
427 {
428 refcount_inc(&idev->refcnt);
429 }
430
431 /* called with rcu_read_lock held */
ip6_ignore_linkdown(const struct net_device * dev)432 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
433 {
434 const struct inet6_dev *idev = __in6_dev_get(dev);
435
436 if (unlikely(!idev))
437 return true;
438
439 return !!idev->cnf.ignore_routes_with_linkdown;
440 }
441
442 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
443
in6_ifa_put(struct inet6_ifaddr * ifp)444 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
445 {
446 if (refcount_dec_and_test(&ifp->refcnt))
447 inet6_ifa_finish_destroy(ifp);
448 }
449
__in6_ifa_put(struct inet6_ifaddr * ifp)450 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
451 {
452 refcount_dec(&ifp->refcnt);
453 }
454
in6_ifa_hold(struct inet6_ifaddr * ifp)455 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
456 {
457 refcount_inc(&ifp->refcnt);
458 }
459
460
461 /*
462 * compute link-local solicited-node multicast address
463 */
464
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)465 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
466 struct in6_addr *solicited)
467 {
468 ipv6_addr_set(solicited,
469 htonl(0xFF020000), 0,
470 htonl(0x1),
471 htonl(0xFF000000) | addr->s6_addr32[3]);
472 }
473
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)474 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
475 {
476 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
477 __be64 *p = (__force __be64 *)addr;
478 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
479 #else
480 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
481 addr->s6_addr32[1] | addr->s6_addr32[2] |
482 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
483 #endif
484 }
485
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)486 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
487 {
488 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
489 __be64 *p = (__force __be64 *)addr;
490 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
491 #else
492 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
493 addr->s6_addr32[1] | addr->s6_addr32[2] |
494 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
495 #endif
496 }
497
ipv6_addr_is_isatap(const struct in6_addr * addr)498 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
499 {
500 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
501 }
502
ipv6_addr_is_solict_mult(const struct in6_addr * addr)503 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
504 {
505 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
506 __be64 *p = (__force __be64 *)addr;
507 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
508 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
509 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
510 #else
511 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
512 addr->s6_addr32[1] |
513 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
514 (addr->s6_addr[12] ^ 0xff)) == 0;
515 #endif
516 }
517
ipv6_addr_is_all_snoopers(const struct in6_addr * addr)518 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
519 {
520 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
521 __be64 *p = (__force __be64 *)addr;
522
523 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
524 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
525 #else
526 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
527 addr->s6_addr32[1] | addr->s6_addr32[2] |
528 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
529 #endif
530 }
531
532 #ifdef CONFIG_PROC_FS
533 int if6_proc_init(void);
534 void if6_proc_exit(void);
535 #endif
536
537 #endif
538