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