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 net_device *dev, struct in6_addr *addr,
129 u32 banned_flags);
130 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
131 bool match_wildcard);
132 bool inet_rcv_saddr_any(const struct sock *sk);
133 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
134 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
135
136 void addrconf_add_linklocal(struct inet6_dev *idev,
137 const struct in6_addr *addr, u32 flags);
138
139 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
140 const struct prefix_info *pinfo,
141 struct inet6_dev *in6_dev,
142 const struct in6_addr *addr, int addr_type,
143 u32 addr_flags, bool sllao, bool tokenized,
144 __u32 valid_lft, u32 prefered_lft);
145
addrconf_addr_eui48_base(u8 * eui,const char * const addr)146 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
147 {
148 memcpy(eui, addr, 3);
149 eui[3] = 0xFF;
150 eui[4] = 0xFE;
151 memcpy(eui + 5, addr + 3, 3);
152 }
153
addrconf_addr_eui48(u8 * eui,const char * const addr)154 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
155 {
156 addrconf_addr_eui48_base(eui, addr);
157 eui[0] ^= 2;
158 }
159
addrconf_ifid_eui48(u8 * eui,struct net_device * dev)160 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
161 {
162 if (dev->addr_len != ETH_ALEN)
163 return -1;
164
165 /*
166 * The zSeries OSA network cards can be shared among various
167 * OS instances, but the OSA cards have only one MAC address.
168 * This leads to duplicate address conflicts in conjunction
169 * with IPv6 if more than one instance uses the same card.
170 *
171 * The driver for these cards can deliver a unique 16-bit
172 * identifier for each instance sharing the same card. It is
173 * placed instead of 0xFFFE in the interface identifier. The
174 * "u" bit of the interface identifier is not inverted in this
175 * case. Hence the resulting interface identifier has local
176 * scope according to RFC2373.
177 */
178
179 addrconf_addr_eui48_base(eui, dev->dev_addr);
180
181 if (dev->dev_id) {
182 eui[3] = (dev->dev_id >> 8) & 0xFF;
183 eui[4] = dev->dev_id & 0xFF;
184 } else {
185 eui[0] ^= 2;
186 }
187
188 return 0;
189 }
190
addrconf_timeout_fixup(u32 timeout,unsigned int unit)191 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
192 unsigned int unit)
193 {
194 if (timeout == 0xffffffff)
195 return ~0UL;
196
197 /*
198 * Avoid arithmetic overflow.
199 * Assuming unit is constant and non-zero, this "if" statement
200 * will go away on 64bit archs.
201 */
202 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
203 return LONG_MAX / unit;
204
205 return timeout;
206 }
207
addrconf_finite_timeout(unsigned long timeout)208 static inline int addrconf_finite_timeout(unsigned long timeout)
209 {
210 return ~timeout;
211 }
212
213 /*
214 * IPv6 Address Label subsystem (addrlabel.c)
215 */
216 int ipv6_addr_label_init(void);
217 void ipv6_addr_label_cleanup(void);
218 int ipv6_addr_label_rtnl_register(void);
219 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
220 int type, int ifindex);
221
222 /*
223 * multicast prototypes (mcast.c)
224 */
ipv6_mc_may_pull(struct sk_buff * skb,unsigned int len)225 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
226 unsigned int len)
227 {
228 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
229 return false;
230
231 return pskb_may_pull(skb, len);
232 }
233
234 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
235 const struct in6_addr *addr);
236 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
237 const struct in6_addr *addr);
238 void __ipv6_sock_mc_close(struct sock *sk);
239 void ipv6_sock_mc_close(struct sock *sk);
240 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
241 const struct in6_addr *src_addr);
242
243 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
244 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
245 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
246 void ipv6_mc_up(struct inet6_dev *idev);
247 void ipv6_mc_down(struct inet6_dev *idev);
248 void ipv6_mc_unmap(struct inet6_dev *idev);
249 void ipv6_mc_remap(struct inet6_dev *idev);
250 void ipv6_mc_init_dev(struct inet6_dev *idev);
251 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
252 int ipv6_mc_check_mld(struct sk_buff *skb);
253 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
254
255 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
256 const struct in6_addr *src_addr);
257
258 void ipv6_mc_dad_complete(struct inet6_dev *idev);
259
260 /*
261 * identify MLD packets for MLD filter exceptions
262 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)263 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
264 {
265 struct icmp6hdr *hdr;
266
267 if (nexthdr != IPPROTO_ICMPV6 ||
268 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
269 return false;
270
271 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
272
273 switch (hdr->icmp6_type) {
274 case ICMPV6_MGM_QUERY:
275 case ICMPV6_MGM_REPORT:
276 case ICMPV6_MGM_REDUCTION:
277 case ICMPV6_MLD2_REPORT:
278 return true;
279 default:
280 break;
281 }
282 return false;
283 }
284
285 void addrconf_prefix_rcv(struct net_device *dev,
286 u8 *opt, int len, bool sllao);
287
288 /* Determines into what table to put autoconf PIO/RIO/default routes
289 * learned on this device.
290 *
291 * - If 0, use the same table for every device. This puts routes into
292 * one of RT_TABLE_{PREFIX,INFO,DFLT} depending on the type of route
293 * (but note that these three are currently all equal to
294 * RT6_TABLE_MAIN).
295 * - If > 0, use the specified table.
296 * - If < 0, put routes into table dev->ifindex + (-rt_table).
297 */
298 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table);
299
300 /*
301 * anycast prototypes (anycast.c)
302 */
303 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
304 const struct in6_addr *addr);
305 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
306 const struct in6_addr *addr);
307 void __ipv6_sock_ac_close(struct sock *sk);
308 void ipv6_sock_ac_close(struct sock *sk);
309
310 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
311 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
312 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
313 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
314 const struct in6_addr *addr);
315 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
316 const struct in6_addr *addr);
317 int ipv6_anycast_init(void);
318 void ipv6_anycast_cleanup(void);
319
320 /* Device notifier */
321 int register_inet6addr_notifier(struct notifier_block *nb);
322 int unregister_inet6addr_notifier(struct notifier_block *nb);
323 int inet6addr_notifier_call_chain(unsigned long val, void *v);
324
325 int register_inet6addr_validator_notifier(struct notifier_block *nb);
326 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
327 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
328
329 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
330 int ifindex, struct ipv6_devconf *devconf);
331
332 /**
333 * __in6_dev_get - get inet6_dev pointer from netdevice
334 * @dev: network device
335 *
336 * Caller must hold rcu_read_lock or RTNL, because this function
337 * does not take a reference on the inet6_dev.
338 */
__in6_dev_get(const struct net_device * dev)339 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
340 {
341 return rcu_dereference_rtnl(dev->ip6_ptr);
342 }
343
344 /**
345 * __in6_dev_stats_get - get inet6_dev pointer for stats
346 * @dev: network device
347 * @skb: skb for original incoming interface if neeeded
348 *
349 * Caller must hold rcu_read_lock or RTNL, because this function
350 * does not take a reference on the inet6_dev.
351 */
__in6_dev_stats_get(const struct net_device * dev,const struct sk_buff * skb)352 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
353 const struct sk_buff *skb)
354 {
355 if (netif_is_l3_master(dev))
356 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
357 return __in6_dev_get(dev);
358 }
359
360 /**
361 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
362 * @dev: network device
363 *
364 * This is a safer version of __in6_dev_get
365 */
__in6_dev_get_safely(const struct net_device * dev)366 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
367 {
368 if (likely(dev))
369 return rcu_dereference_rtnl(dev->ip6_ptr);
370 else
371 return NULL;
372 }
373
374 /**
375 * in6_dev_get - get inet6_dev pointer from netdevice
376 * @dev: network device
377 *
378 * This version can be used in any context, and takes a reference
379 * on the inet6_dev. Callers must use in6_dev_put() later to
380 * release this reference.
381 */
in6_dev_get(const struct net_device * dev)382 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
383 {
384 struct inet6_dev *idev;
385
386 rcu_read_lock();
387 idev = rcu_dereference(dev->ip6_ptr);
388 if (idev)
389 refcount_inc(&idev->refcnt);
390 rcu_read_unlock();
391 return idev;
392 }
393
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)394 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
395 {
396 struct inet6_dev *idev = __in6_dev_get(dev);
397
398 return idev ? idev->nd_parms : NULL;
399 }
400
401 void in6_dev_finish_destroy(struct inet6_dev *idev);
402
in6_dev_put(struct inet6_dev * idev)403 static inline void in6_dev_put(struct inet6_dev *idev)
404 {
405 if (refcount_dec_and_test(&idev->refcnt))
406 in6_dev_finish_destroy(idev);
407 }
408
in6_dev_put_clear(struct inet6_dev ** pidev)409 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
410 {
411 struct inet6_dev *idev = *pidev;
412
413 if (idev) {
414 in6_dev_put(idev);
415 *pidev = NULL;
416 }
417 }
418
__in6_dev_put(struct inet6_dev * idev)419 static inline void __in6_dev_put(struct inet6_dev *idev)
420 {
421 refcount_dec(&idev->refcnt);
422 }
423
in6_dev_hold(struct inet6_dev * idev)424 static inline void in6_dev_hold(struct inet6_dev *idev)
425 {
426 refcount_inc(&idev->refcnt);
427 }
428
429 /* called with rcu_read_lock held */
ip6_ignore_linkdown(const struct net_device * dev)430 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
431 {
432 const struct inet6_dev *idev = __in6_dev_get(dev);
433
434 if (unlikely(!idev))
435 return true;
436
437 return !!idev->cnf.ignore_routes_with_linkdown;
438 }
439
440 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
441
in6_ifa_put(struct inet6_ifaddr * ifp)442 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
443 {
444 if (refcount_dec_and_test(&ifp->refcnt))
445 inet6_ifa_finish_destroy(ifp);
446 }
447
__in6_ifa_put(struct inet6_ifaddr * ifp)448 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
449 {
450 refcount_dec(&ifp->refcnt);
451 }
452
in6_ifa_hold(struct inet6_ifaddr * ifp)453 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
454 {
455 refcount_inc(&ifp->refcnt);
456 }
457
458
459 /*
460 * compute link-local solicited-node multicast address
461 */
462
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)463 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
464 struct in6_addr *solicited)
465 {
466 ipv6_addr_set(solicited,
467 htonl(0xFF020000), 0,
468 htonl(0x1),
469 htonl(0xFF000000) | addr->s6_addr32[3]);
470 }
471
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)472 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
473 {
474 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
475 __be64 *p = (__force __be64 *)addr;
476 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
477 #else
478 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
479 addr->s6_addr32[1] | addr->s6_addr32[2] |
480 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
481 #endif
482 }
483
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)484 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
485 {
486 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
487 __be64 *p = (__force __be64 *)addr;
488 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
489 #else
490 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
491 addr->s6_addr32[1] | addr->s6_addr32[2] |
492 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
493 #endif
494 }
495
ipv6_addr_is_isatap(const struct in6_addr * addr)496 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
497 {
498 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
499 }
500
ipv6_addr_is_solict_mult(const struct in6_addr * addr)501 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
502 {
503 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
504 __be64 *p = (__force __be64 *)addr;
505 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
506 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
507 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
508 #else
509 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
510 addr->s6_addr32[1] |
511 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
512 (addr->s6_addr[12] ^ 0xff)) == 0;
513 #endif
514 }
515
ipv6_addr_is_all_snoopers(const struct in6_addr * addr)516 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
517 {
518 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
519 __be64 *p = (__force __be64 *)addr;
520
521 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
522 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
523 #else
524 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
525 addr->s6_addr32[1] | addr->s6_addr32[2] |
526 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
527 #endif
528 }
529
530 #ifdef CONFIG_PROC_FS
531 int if6_proc_init(void);
532 void if6_proc_exit(void);
533 #endif
534
535 #endif
536