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