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 #if defined(__BIG_ENDIAN_BITFIELD)
35 __u8 onlink : 1,
36 autoconf : 1,
37 reserved : 6;
38 #elif defined(__LITTLE_ENDIAN_BITFIELD)
39 __u8 reserved : 6,
40 autoconf : 1,
41 onlink : 1;
42 #else
43 #error "Please fix <asm/byteorder.h>"
44 #endif
45 __be32 valid;
46 __be32 prefered;
47 __be32 reserved2;
48
49 struct in6_addr prefix;
50 };
51
52 #include <linux/ipv6.h>
53 #include <linux/netdevice.h>
54 #include <net/if_inet6.h>
55 #include <net/ipv6.h>
56
57 struct in6_validator_info {
58 struct in6_addr i6vi_addr;
59 struct inet6_dev *i6vi_dev;
60 struct netlink_ext_ack *extack;
61 };
62
63 struct ifa6_config {
64 const struct in6_addr *pfx;
65 unsigned int plen;
66
67 const struct in6_addr *peer_pfx;
68
69 u32 rt_priority;
70 u32 ifa_flags;
71 u32 preferred_lft;
72 u32 valid_lft;
73 u16 scope;
74 };
75
76 int addrconf_init(void);
77 void addrconf_cleanup(void);
78
79 int addrconf_add_ifaddr(struct net *net, void __user *arg);
80 int addrconf_del_ifaddr(struct net *net, void __user *arg);
81 int addrconf_set_dstaddr(struct net *net, void __user *arg);
82
83 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
84 const struct net_device *dev, int strict);
85 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
86 const struct net_device *dev, bool skip_dev_check,
87 int strict, u32 banned_flags);
88
89 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
90 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
91 #endif
92
93 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
94 const unsigned int prefix_len,
95 struct net_device *dev);
96
97 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
98
99 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
100 const struct in6_addr *addr,
101 struct net_device *dev, int strict);
102
103 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
104 const struct in6_addr *daddr, unsigned int srcprefs,
105 struct in6_addr *saddr);
106 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
107 u32 banned_flags);
108 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
109 u32 banned_flags);
110 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
111 bool match_wildcard);
112 bool inet_rcv_saddr_any(const struct sock *sk);
113 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
114 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
115
116 void addrconf_add_linklocal(struct inet6_dev *idev,
117 const struct in6_addr *addr, u32 flags);
118
119 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
120 const struct prefix_info *pinfo,
121 struct inet6_dev *in6_dev,
122 const struct in6_addr *addr, int addr_type,
123 u32 addr_flags, bool sllao, bool tokenized,
124 __u32 valid_lft, u32 prefered_lft);
125
addrconf_addr_eui48_base(u8 * eui,const char * const addr)126 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
127 {
128 memcpy(eui, addr, 3);
129 eui[3] = 0xFF;
130 eui[4] = 0xFE;
131 memcpy(eui + 5, addr + 3, 3);
132 }
133
addrconf_addr_eui48(u8 * eui,const char * const addr)134 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
135 {
136 addrconf_addr_eui48_base(eui, addr);
137 eui[0] ^= 2;
138 }
139
addrconf_ifid_eui48(u8 * eui,struct net_device * dev)140 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
141 {
142 if (dev->addr_len != ETH_ALEN)
143 return -1;
144
145 /*
146 * The zSeries OSA network cards can be shared among various
147 * OS instances, but the OSA cards have only one MAC address.
148 * This leads to duplicate address conflicts in conjunction
149 * with IPv6 if more than one instance uses the same card.
150 *
151 * The driver for these cards can deliver a unique 16-bit
152 * identifier for each instance sharing the same card. It is
153 * placed instead of 0xFFFE in the interface identifier. The
154 * "u" bit of the interface identifier is not inverted in this
155 * case. Hence the resulting interface identifier has local
156 * scope according to RFC2373.
157 */
158
159 addrconf_addr_eui48_base(eui, dev->dev_addr);
160
161 if (dev->dev_id) {
162 eui[3] = (dev->dev_id >> 8) & 0xFF;
163 eui[4] = dev->dev_id & 0xFF;
164 } else {
165 eui[0] ^= 2;
166 }
167
168 return 0;
169 }
170
addrconf_timeout_fixup(u32 timeout,unsigned int unit)171 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
172 unsigned int unit)
173 {
174 if (timeout == 0xffffffff)
175 return ~0UL;
176
177 /*
178 * Avoid arithmetic overflow.
179 * Assuming unit is constant and non-zero, this "if" statement
180 * will go away on 64bit archs.
181 */
182 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
183 return LONG_MAX / unit;
184
185 return timeout;
186 }
187
addrconf_finite_timeout(unsigned long timeout)188 static inline int addrconf_finite_timeout(unsigned long timeout)
189 {
190 return ~timeout;
191 }
192
193 /*
194 * IPv6 Address Label subsystem (addrlabel.c)
195 */
196 int ipv6_addr_label_init(void);
197 void ipv6_addr_label_cleanup(void);
198 int ipv6_addr_label_rtnl_register(void);
199 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
200 int type, int ifindex);
201
202 /*
203 * multicast prototypes (mcast.c)
204 */
ipv6_mc_may_pull(struct sk_buff * skb,unsigned int len)205 static inline int ipv6_mc_may_pull(struct sk_buff *skb,
206 unsigned int len)
207 {
208 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
209 return 0;
210
211 return pskb_may_pull(skb, len);
212 }
213
214 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
215 const struct in6_addr *addr);
216 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
217 const struct in6_addr *addr);
218 void __ipv6_sock_mc_close(struct sock *sk);
219 void ipv6_sock_mc_close(struct sock *sk);
220 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
221 const struct in6_addr *src_addr);
222
223 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
224 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
225 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
226 void ipv6_mc_up(struct inet6_dev *idev);
227 void ipv6_mc_down(struct inet6_dev *idev);
228 void ipv6_mc_unmap(struct inet6_dev *idev);
229 void ipv6_mc_remap(struct inet6_dev *idev);
230 void ipv6_mc_init_dev(struct inet6_dev *idev);
231 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
232 int ipv6_mc_check_icmpv6(struct sk_buff *skb);
233 int ipv6_mc_check_mld(struct sk_buff *skb);
234 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
235
236 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
237 const struct in6_addr *src_addr);
238
239 void ipv6_mc_dad_complete(struct inet6_dev *idev);
240
241 /*
242 * identify MLD packets for MLD filter exceptions
243 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)244 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
245 {
246 struct icmp6hdr *hdr;
247
248 if (nexthdr != IPPROTO_ICMPV6 ||
249 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
250 return false;
251
252 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
253
254 switch (hdr->icmp6_type) {
255 case ICMPV6_MGM_QUERY:
256 case ICMPV6_MGM_REPORT:
257 case ICMPV6_MGM_REDUCTION:
258 case ICMPV6_MLD2_REPORT:
259 return true;
260 default:
261 break;
262 }
263 return false;
264 }
265
266 void addrconf_prefix_rcv(struct net_device *dev,
267 u8 *opt, int len, bool sllao);
268
269 /*
270 * anycast prototypes (anycast.c)
271 */
272 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
273 const struct in6_addr *addr);
274 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
275 const struct in6_addr *addr);
276 void ipv6_sock_ac_close(struct sock *sk);
277
278 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
279 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
280 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
281 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
282 const struct in6_addr *addr);
283 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
284 const struct in6_addr *addr);
285 int ipv6_anycast_init(void);
286 void ipv6_anycast_cleanup(void);
287
288 /* Device notifier */
289 int register_inet6addr_notifier(struct notifier_block *nb);
290 int unregister_inet6addr_notifier(struct notifier_block *nb);
291 int inet6addr_notifier_call_chain(unsigned long val, void *v);
292
293 int register_inet6addr_validator_notifier(struct notifier_block *nb);
294 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
295 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
296
297 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
298 int ifindex, struct ipv6_devconf *devconf);
299
300 /**
301 * __in6_dev_get - get inet6_dev pointer from netdevice
302 * @dev: network device
303 *
304 * Caller must hold rcu_read_lock or RTNL, because this function
305 * does not take a reference on the inet6_dev.
306 */
__in6_dev_get(const struct net_device * dev)307 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
308 {
309 return rcu_dereference_rtnl(dev->ip6_ptr);
310 }
311
312 /**
313 * __in6_dev_stats_get - get inet6_dev pointer for stats
314 * @dev: network device
315 * @skb: skb for original incoming interface if neeeded
316 *
317 * Caller must hold rcu_read_lock or RTNL, because this function
318 * does not take a reference on the inet6_dev.
319 */
__in6_dev_stats_get(const struct net_device * dev,const struct sk_buff * skb)320 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
321 const struct sk_buff *skb)
322 {
323 if (netif_is_l3_master(dev))
324 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
325 return __in6_dev_get(dev);
326 }
327
328 /**
329 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
330 * @dev: network device
331 *
332 * This is a safer version of __in6_dev_get
333 */
__in6_dev_get_safely(const struct net_device * dev)334 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
335 {
336 if (likely(dev))
337 return rcu_dereference_rtnl(dev->ip6_ptr);
338 else
339 return NULL;
340 }
341
342 /**
343 * in6_dev_get - get inet6_dev pointer from netdevice
344 * @dev: network device
345 *
346 * This version can be used in any context, and takes a reference
347 * on the inet6_dev. Callers must use in6_dev_put() later to
348 * release this reference.
349 */
in6_dev_get(const struct net_device * dev)350 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
351 {
352 struct inet6_dev *idev;
353
354 rcu_read_lock();
355 idev = rcu_dereference(dev->ip6_ptr);
356 if (idev)
357 refcount_inc(&idev->refcnt);
358 rcu_read_unlock();
359 return idev;
360 }
361
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)362 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
363 {
364 struct inet6_dev *idev = __in6_dev_get(dev);
365
366 return idev ? idev->nd_parms : NULL;
367 }
368
369 void in6_dev_finish_destroy(struct inet6_dev *idev);
370
in6_dev_put(struct inet6_dev * idev)371 static inline void in6_dev_put(struct inet6_dev *idev)
372 {
373 if (refcount_dec_and_test(&idev->refcnt))
374 in6_dev_finish_destroy(idev);
375 }
376
in6_dev_put_clear(struct inet6_dev ** pidev)377 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
378 {
379 struct inet6_dev *idev = *pidev;
380
381 if (idev) {
382 in6_dev_put(idev);
383 *pidev = NULL;
384 }
385 }
386
__in6_dev_put(struct inet6_dev * idev)387 static inline void __in6_dev_put(struct inet6_dev *idev)
388 {
389 refcount_dec(&idev->refcnt);
390 }
391
in6_dev_hold(struct inet6_dev * idev)392 static inline void in6_dev_hold(struct inet6_dev *idev)
393 {
394 refcount_inc(&idev->refcnt);
395 }
396
397 /* called with rcu_read_lock held */
ip6_ignore_linkdown(const struct net_device * dev)398 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
399 {
400 const struct inet6_dev *idev = __in6_dev_get(dev);
401
402 return !!idev->cnf.ignore_routes_with_linkdown;
403 }
404
405 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
406
in6_ifa_put(struct inet6_ifaddr * ifp)407 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
408 {
409 if (refcount_dec_and_test(&ifp->refcnt))
410 inet6_ifa_finish_destroy(ifp);
411 }
412
__in6_ifa_put(struct inet6_ifaddr * ifp)413 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
414 {
415 refcount_dec(&ifp->refcnt);
416 }
417
in6_ifa_hold(struct inet6_ifaddr * ifp)418 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
419 {
420 refcount_inc(&ifp->refcnt);
421 }
422
423
424 /*
425 * compute link-local solicited-node multicast address
426 */
427
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)428 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
429 struct in6_addr *solicited)
430 {
431 ipv6_addr_set(solicited,
432 htonl(0xFF020000), 0,
433 htonl(0x1),
434 htonl(0xFF000000) | addr->s6_addr32[3]);
435 }
436
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)437 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
438 {
439 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
440 __be64 *p = (__be64 *)addr;
441 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
442 #else
443 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
444 addr->s6_addr32[1] | addr->s6_addr32[2] |
445 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
446 #endif
447 }
448
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)449 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
450 {
451 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
452 __be64 *p = (__be64 *)addr;
453 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
454 #else
455 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
456 addr->s6_addr32[1] | addr->s6_addr32[2] |
457 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
458 #endif
459 }
460
ipv6_addr_is_isatap(const struct in6_addr * addr)461 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
462 {
463 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
464 }
465
ipv6_addr_is_solict_mult(const struct in6_addr * addr)466 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
467 {
468 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
469 __be64 *p = (__be64 *)addr;
470 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
471 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
472 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
473 #else
474 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
475 addr->s6_addr32[1] |
476 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
477 (addr->s6_addr[12] ^ 0xff)) == 0;
478 #endif
479 }
480
ipv6_addr_is_all_snoopers(const struct in6_addr * addr)481 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
482 {
483 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
484 __be64 *p = (__be64 *)addr;
485
486 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
487 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
488 #else
489 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
490 addr->s6_addr32[1] | addr->s6_addr32[2] |
491 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
492 #endif
493 }
494
495 #ifdef CONFIG_PROC_FS
496 int if6_proc_init(void);
497 void if6_proc_exit(void);
498 #endif
499
500 #endif
501
