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 union __packed {
35 __u8 flags;
36 struct __packed {
37 #if defined(__BIG_ENDIAN_BITFIELD)
38 __u8 onlink : 1,
39 autoconf : 1,
40 reserved : 6;
41 #elif defined(__LITTLE_ENDIAN_BITFIELD)
42 __u8 reserved : 6,
43 autoconf : 1,
44 onlink : 1;
45 #else
46 #error "Please fix <asm/byteorder.h>"
47 #endif
48 };
49 };
50 __be32 valid;
51 __be32 prefered;
52 __be32 reserved2;
53
54 struct in6_addr prefix;
55 };
56
57 /* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
58 static_assert(sizeof(struct prefix_info) == 32);
59
60 #include <linux/ipv6.h>
61 #include <linux/netdevice.h>
62 #include <net/if_inet6.h>
63 #include <net/ipv6.h>
64
65 struct in6_validator_info {
66 struct in6_addr i6vi_addr;
67 struct inet6_dev *i6vi_dev;
68 struct netlink_ext_ack *extack;
69 };
70
71 struct ifa6_config {
72 const struct in6_addr *pfx;
73 unsigned int plen;
74
75 const struct in6_addr *peer_pfx;
76
77 u32 rt_priority;
78 u32 ifa_flags;
79 u32 preferred_lft;
80 u32 valid_lft;
81 u16 scope;
82 };
83
84 int addrconf_init(void);
85 void addrconf_cleanup(void);
86
87 int addrconf_add_ifaddr(struct net *net, void __user *arg);
88 int addrconf_del_ifaddr(struct net *net, void __user *arg);
89 int addrconf_set_dstaddr(struct net *net, void __user *arg);
90
91 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
92 const struct net_device *dev, int strict);
93 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
94 const struct net_device *dev, bool skip_dev_check,
95 int strict, u32 banned_flags);
96
97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
98 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
99 #endif
100
101 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
102 unsigned char nsegs);
103
104 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
105 const unsigned int prefix_len,
106 struct net_device *dev);
107
108 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
109
110 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
111 struct net_device *dev);
112
113 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
114 const struct in6_addr *addr,
115 struct net_device *dev, int strict);
116
117 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
118 const struct in6_addr *daddr, unsigned int srcprefs,
119 struct in6_addr *saddr);
120 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
121 u32 banned_flags);
122 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
123 bool match_wildcard);
124 bool inet_rcv_saddr_any(const struct sock *sk);
125 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
126 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
127
128 void addrconf_add_linklocal(struct inet6_dev *idev,
129 const struct in6_addr *addr, u32 flags);
130
131 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
132 const struct prefix_info *pinfo,
133 struct inet6_dev *in6_dev,
134 const struct in6_addr *addr, int addr_type,
135 u32 addr_flags, bool sllao, bool tokenized,
136 __u32 valid_lft, u32 prefered_lft);
137
addrconf_addr_eui48_base(u8 * eui,const char * const addr)138 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
139 {
140 memcpy(eui, addr, 3);
141 eui[3] = 0xFF;
142 eui[4] = 0xFE;
143 memcpy(eui + 5, addr + 3, 3);
144 }
145
addrconf_addr_eui48(u8 * eui,const char * const addr)146 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
147 {
148 addrconf_addr_eui48_base(eui, addr);
149 eui[0] ^= 2;
150 }
151
addrconf_ifid_eui48(u8 * eui,struct net_device * dev)152 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
153 {
154 if (dev->addr_len != ETH_ALEN)
155 return -1;
156
157 /*
158 * The zSeries OSA network cards can be shared among various
159 * OS instances, but the OSA cards have only one MAC address.
160 * This leads to duplicate address conflicts in conjunction
161 * with IPv6 if more than one instance uses the same card.
162 *
163 * The driver for these cards can deliver a unique 16-bit
164 * identifier for each instance sharing the same card. It is
165 * placed instead of 0xFFFE in the interface identifier. The
166 * "u" bit of the interface identifier is not inverted in this
167 * case. Hence the resulting interface identifier has local
168 * scope according to RFC2373.
169 */
170
171 addrconf_addr_eui48_base(eui, dev->dev_addr);
172
173 if (dev->dev_id) {
174 eui[3] = (dev->dev_id >> 8) & 0xFF;
175 eui[4] = dev->dev_id & 0xFF;
176 } else {
177 eui[0] ^= 2;
178 }
179
180 return 0;
181 }
182
addrconf_timeout_fixup(u32 timeout,unsigned int unit)183 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
184 unsigned int unit)
185 {
186 if (timeout == 0xffffffff)
187 return ~0UL;
188
189 /*
190 * Avoid arithmetic overflow.
191 * Assuming unit is constant and non-zero, this "if" statement
192 * will go away on 64bit archs.
193 */
194 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
195 return LONG_MAX / unit;
196
197 return timeout;
198 }
199
addrconf_finite_timeout(unsigned long timeout)200 static inline int addrconf_finite_timeout(unsigned long timeout)
201 {
202 return ~timeout;
203 }
204
205 /*
206 * IPv6 Address Label subsystem (addrlabel.c)
207 */
208 int ipv6_addr_label_init(void);
209 void ipv6_addr_label_cleanup(void);
210 int ipv6_addr_label_rtnl_register(void);
211 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
212 int type, int ifindex);
213
214 /*
215 * multicast prototypes (mcast.c)
216 */
ipv6_mc_may_pull(struct sk_buff * skb,unsigned int len)217 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
218 unsigned int len)
219 {
220 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
221 return false;
222
223 return pskb_may_pull(skb, len);
224 }
225
226 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
227 const struct in6_addr *addr);
228 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
229 const struct in6_addr *addr);
230 void __ipv6_sock_mc_close(struct sock *sk);
231 void ipv6_sock_mc_close(struct sock *sk);
232 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
233 const struct in6_addr *src_addr);
234
235 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
236 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
237 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
238 void ipv6_mc_up(struct inet6_dev *idev);
239 void ipv6_mc_down(struct inet6_dev *idev);
240 void ipv6_mc_unmap(struct inet6_dev *idev);
241 void ipv6_mc_remap(struct inet6_dev *idev);
242 void ipv6_mc_init_dev(struct inet6_dev *idev);
243 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
244 int ipv6_mc_check_mld(struct sk_buff *skb);
245 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
246
247 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
248 const struct in6_addr *src_addr);
249
250 void ipv6_mc_dad_complete(struct inet6_dev *idev);
251
252 /*
253 * identify MLD packets for MLD filter exceptions
254 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)255 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
256 {
257 struct icmp6hdr *hdr;
258
259 if (nexthdr != IPPROTO_ICMPV6 ||
260 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
261 return false;
262
263 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
264
265 switch (hdr->icmp6_type) {
266 case ICMPV6_MGM_QUERY:
267 case ICMPV6_MGM_REPORT:
268 case ICMPV6_MGM_REDUCTION:
269 case ICMPV6_MLD2_REPORT:
270 return true;
271 default:
272 break;
273 }
274 return false;
275 }
276
277 void addrconf_prefix_rcv(struct net_device *dev,
278 u8 *opt, int len, bool sllao);
279
280 /*
281 * anycast prototypes (anycast.c)
282 */
283 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
284 const struct in6_addr *addr);
285 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
286 const struct in6_addr *addr);
287 void __ipv6_sock_ac_close(struct sock *sk);
288 void ipv6_sock_ac_close(struct sock *sk);
289
290 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
291 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
292 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
293 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
294 const struct in6_addr *addr);
295 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
296 const struct in6_addr *addr);
297 int ipv6_anycast_init(void);
298 void ipv6_anycast_cleanup(void);
299
300 /* Device notifier */
301 int register_inet6addr_notifier(struct notifier_block *nb);
302 int unregister_inet6addr_notifier(struct notifier_block *nb);
303 int inet6addr_notifier_call_chain(unsigned long val, void *v);
304
305 int register_inet6addr_validator_notifier(struct notifier_block *nb);
306 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
307 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
308
309 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
310 int ifindex, struct ipv6_devconf *devconf);
311
312 /**
313 * __in6_dev_get - get inet6_dev pointer from netdevice
314 * @dev: network device
315 *
316 * Caller must hold rcu_read_lock or RTNL, because this function
317 * does not take a reference on the inet6_dev.
318 */
__in6_dev_get(const struct net_device * dev)319 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
320 {
321 return rcu_dereference_rtnl(dev->ip6_ptr);
322 }
323
324 /**
325 * __in6_dev_stats_get - get inet6_dev pointer for stats
326 * @dev: network device
327 * @skb: skb for original incoming interface if neeeded
328 *
329 * Caller must hold rcu_read_lock or RTNL, because this function
330 * does not take a reference on the inet6_dev.
331 */
__in6_dev_stats_get(const struct net_device * dev,const struct sk_buff * skb)332 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
333 const struct sk_buff *skb)
334 {
335 if (netif_is_l3_master(dev))
336 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
337 return __in6_dev_get(dev);
338 }
339
340 /**
341 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
342 * @dev: network device
343 *
344 * This is a safer version of __in6_dev_get
345 */
__in6_dev_get_safely(const struct net_device * dev)346 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
347 {
348 if (likely(dev))
349 return rcu_dereference_rtnl(dev->ip6_ptr);
350 else
351 return NULL;
352 }
353
354 /**
355 * in6_dev_get - get inet6_dev pointer from netdevice
356 * @dev: network device
357 *
358 * This version can be used in any context, and takes a reference
359 * on the inet6_dev. Callers must use in6_dev_put() later to
360 * release this reference.
361 */
in6_dev_get(const struct net_device * dev)362 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
363 {
364 struct inet6_dev *idev;
365
366 rcu_read_lock();
367 idev = rcu_dereference(dev->ip6_ptr);
368 if (idev)
369 refcount_inc(&idev->refcnt);
370 rcu_read_unlock();
371 return idev;
372 }
373
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)374 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
375 {
376 struct inet6_dev *idev = __in6_dev_get(dev);
377
378 return idev ? idev->nd_parms : NULL;
379 }
380
381 void in6_dev_finish_destroy(struct inet6_dev *idev);
382
in6_dev_put(struct inet6_dev * idev)383 static inline void in6_dev_put(struct inet6_dev *idev)
384 {
385 if (refcount_dec_and_test(&idev->refcnt))
386 in6_dev_finish_destroy(idev);
387 }
388
in6_dev_put_clear(struct inet6_dev ** pidev)389 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
390 {
391 struct inet6_dev *idev = *pidev;
392
393 if (idev) {
394 in6_dev_put(idev);
395 *pidev = NULL;
396 }
397 }
398
__in6_dev_put(struct inet6_dev * idev)399 static inline void __in6_dev_put(struct inet6_dev *idev)
400 {
401 refcount_dec(&idev->refcnt);
402 }
403
in6_dev_hold(struct inet6_dev * idev)404 static inline void in6_dev_hold(struct inet6_dev *idev)
405 {
406 refcount_inc(&idev->refcnt);
407 }
408
409 /* called with rcu_read_lock held */
ip6_ignore_linkdown(const struct net_device * dev)410 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
411 {
412 const struct inet6_dev *idev = __in6_dev_get(dev);
413
414 if (unlikely(!idev))
415 return true;
416
417 return !!idev->cnf.ignore_routes_with_linkdown;
418 }
419
420 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
421
in6_ifa_put(struct inet6_ifaddr * ifp)422 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
423 {
424 if (refcount_dec_and_test(&ifp->refcnt))
425 inet6_ifa_finish_destroy(ifp);
426 }
427
__in6_ifa_put(struct inet6_ifaddr * ifp)428 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
429 {
430 refcount_dec(&ifp->refcnt);
431 }
432
in6_ifa_hold(struct inet6_ifaddr * ifp)433 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
434 {
435 refcount_inc(&ifp->refcnt);
436 }
437
in6_ifa_hold_safe(struct inet6_ifaddr * ifp)438 static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
439 {
440 return refcount_inc_not_zero(&ifp->refcnt);
441 }
442
443 /*
444 * compute link-local solicited-node multicast address
445 */
446
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)447 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
448 struct in6_addr *solicited)
449 {
450 ipv6_addr_set(solicited,
451 htonl(0xFF020000), 0,
452 htonl(0x1),
453 htonl(0xFF000000) | addr->s6_addr32[3]);
454 }
455
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)456 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
457 {
458 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
459 __be64 *p = (__force __be64 *)addr;
460 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
461 #else
462 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
463 addr->s6_addr32[1] | addr->s6_addr32[2] |
464 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
465 #endif
466 }
467
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)468 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
469 {
470 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
471 __be64 *p = (__force __be64 *)addr;
472 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
473 #else
474 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
475 addr->s6_addr32[1] | addr->s6_addr32[2] |
476 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
477 #endif
478 }
479
ipv6_addr_is_isatap(const struct in6_addr * addr)480 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
481 {
482 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
483 }
484
ipv6_addr_is_solict_mult(const struct in6_addr * addr)485 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
486 {
487 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
488 __be64 *p = (__force __be64 *)addr;
489 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
490 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
491 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
492 #else
493 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
494 addr->s6_addr32[1] |
495 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
496 (addr->s6_addr[12] ^ 0xff)) == 0;
497 #endif
498 }
499
ipv6_addr_is_all_snoopers(const struct in6_addr * addr)500 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
501 {
502 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
503 __be64 *p = (__force __be64 *)addr;
504
505 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
506 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
507 #else
508 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
509 addr->s6_addr32[1] | addr->s6_addr32[2] |
510 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
511 #endif
512 }
513
514 #ifdef CONFIG_PROC_FS
515 int if6_proc_init(void);
516 void if6_proc_exit(void);
517 #endif
518
519 #endif
520