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 TEMP_VALID_LIFETIME (7*86400)
10 #define TEMP_PREFERRED_LIFETIME (86400)
11 #define REGEN_MAX_RETRY (3)
12 #define MAX_DESYNC_FACTOR (600)
13
14 #define ADDR_CHECK_FREQUENCY (120*HZ)
15
16 #define IPV6_MAX_ADDRESSES 16
17
18 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
19 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
20 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
21
22 #define ADDRCONF_NOTIFY_PRIORITY 0
23
24 #include <linux/in.h>
25 #include <linux/in6.h>
26
27 struct prefix_info {
28 __u8 type;
29 __u8 length;
30 __u8 prefix_len;
31
32 #if defined(__BIG_ENDIAN_BITFIELD)
33 __u8 onlink : 1,
34 autoconf : 1,
35 reserved : 6;
36 #elif defined(__LITTLE_ENDIAN_BITFIELD)
37 __u8 reserved : 6,
38 autoconf : 1,
39 onlink : 1;
40 #else
41 #error "Please fix <asm/byteorder.h>"
42 #endif
43 __be32 valid;
44 __be32 prefered;
45 __be32 reserved2;
46
47 struct in6_addr prefix;
48 };
49
50 #include <linux/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <net/if_inet6.h>
53 #include <net/ipv6.h>
54
55 struct in6_validator_info {
56 struct in6_addr i6vi_addr;
57 struct inet6_dev *i6vi_dev;
58 struct netlink_ext_ack *extack;
59 };
60
61 struct ifa6_config {
62 const struct in6_addr *pfx;
63 unsigned int plen;
64
65 const struct in6_addr *peer_pfx;
66
67 u32 rt_priority;
68 u32 ifa_flags;
69 u32 preferred_lft;
70 u32 valid_lft;
71 u16 scope;
72 };
73
74 int addrconf_init(void);
75 void addrconf_cleanup(void);
76
77 int addrconf_add_ifaddr(struct net *net, void __user *arg);
78 int addrconf_del_ifaddr(struct net *net, void __user *arg);
79 int addrconf_set_dstaddr(struct net *net, void __user *arg);
80
81 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
82 const struct net_device *dev, int strict);
83 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
84 const struct net_device *dev, bool skip_dev_check,
85 int strict, u32 banned_flags);
86
87 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
88 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
89 #endif
90
91 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
92 unsigned char nsegs);
93
94 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
95 const unsigned int prefix_len,
96 struct net_device *dev);
97
98 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
99
100 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
101 struct net_device *dev);
102
103 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
104 const struct in6_addr *addr,
105 struct net_device *dev, int strict);
106
107 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
108 const struct in6_addr *daddr, unsigned int srcprefs,
109 struct in6_addr *saddr);
110 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
111 u32 banned_flags);
112 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
113 u32 banned_flags);
114 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
115 bool match_wildcard);
116 bool inet_rcv_saddr_any(const struct sock *sk);
117 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
118 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
119
120 void addrconf_add_linklocal(struct inet6_dev *idev,
121 const struct in6_addr *addr, u32 flags);
122
123 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
124 const struct prefix_info *pinfo,
125 struct inet6_dev *in6_dev,
126 const struct in6_addr *addr, int addr_type,
127 u32 addr_flags, bool sllao, bool tokenized,
128 __u32 valid_lft, u32 prefered_lft);
129
addrconf_addr_eui48_base(u8 * eui,const char * const addr)130 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
131 {
132 memcpy(eui, addr, 3);
133 eui[3] = 0xFF;
134 eui[4] = 0xFE;
135 memcpy(eui + 5, addr + 3, 3);
136 }
137
addrconf_addr_eui48(u8 * eui,const char * const addr)138 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
139 {
140 addrconf_addr_eui48_base(eui, addr);
141 eui[0] ^= 2;
142 }
143
addrconf_ifid_eui48(u8 * eui,struct net_device * dev)144 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
145 {
146 if (dev->addr_len != ETH_ALEN)
147 return -1;
148
149 /*
150 * The zSeries OSA network cards can be shared among various
151 * OS instances, but the OSA cards have only one MAC address.
152 * This leads to duplicate address conflicts in conjunction
153 * with IPv6 if more than one instance uses the same card.
154 *
155 * The driver for these cards can deliver a unique 16-bit
156 * identifier for each instance sharing the same card. It is
157 * placed instead of 0xFFFE in the interface identifier. The
158 * "u" bit of the interface identifier is not inverted in this
159 * case. Hence the resulting interface identifier has local
160 * scope according to RFC2373.
161 */
162
163 addrconf_addr_eui48_base(eui, dev->dev_addr);
164
165 if (dev->dev_id) {
166 eui[3] = (dev->dev_id >> 8) & 0xFF;
167 eui[4] = dev->dev_id & 0xFF;
168 } else {
169 eui[0] ^= 2;
170 }
171
172 return 0;
173 }
174
addrconf_timeout_fixup(u32 timeout,unsigned int unit)175 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
176 unsigned int unit)
177 {
178 if (timeout == 0xffffffff)
179 return ~0UL;
180
181 /*
182 * Avoid arithmetic overflow.
183 * Assuming unit is constant and non-zero, this "if" statement
184 * will go away on 64bit archs.
185 */
186 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
187 return LONG_MAX / unit;
188
189 return timeout;
190 }
191
addrconf_finite_timeout(unsigned long timeout)192 static inline int addrconf_finite_timeout(unsigned long timeout)
193 {
194 return ~timeout;
195 }
196
197 /*
198 * IPv6 Address Label subsystem (addrlabel.c)
199 */
200 int ipv6_addr_label_init(void);
201 void ipv6_addr_label_cleanup(void);
202 int ipv6_addr_label_rtnl_register(void);
203 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
204 int type, int ifindex);
205
206 /*
207 * multicast prototypes (mcast.c)
208 */
ipv6_mc_may_pull(struct sk_buff * skb,unsigned int len)209 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
210 unsigned int len)
211 {
212 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
213 return false;
214
215 return pskb_may_pull(skb, len);
216 }
217
218 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
219 const struct in6_addr *addr);
220 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
221 const struct in6_addr *addr);
222 void __ipv6_sock_mc_close(struct sock *sk);
223 void ipv6_sock_mc_close(struct sock *sk);
224 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
225 const struct in6_addr *src_addr);
226
227 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
228 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
229 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
230 void ipv6_mc_up(struct inet6_dev *idev);
231 void ipv6_mc_down(struct inet6_dev *idev);
232 void ipv6_mc_unmap(struct inet6_dev *idev);
233 void ipv6_mc_remap(struct inet6_dev *idev);
234 void ipv6_mc_init_dev(struct inet6_dev *idev);
235 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
236 int ipv6_mc_check_mld(struct sk_buff *skb);
237 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
238
239 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
240 const struct in6_addr *src_addr);
241
242 void ipv6_mc_dad_complete(struct inet6_dev *idev);
243
244 /*
245 * identify MLD packets for MLD filter exceptions
246 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)247 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
248 {
249 struct icmp6hdr *hdr;
250
251 if (nexthdr != IPPROTO_ICMPV6 ||
252 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
253 return false;
254
255 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
256
257 switch (hdr->icmp6_type) {
258 case ICMPV6_MGM_QUERY:
259 case ICMPV6_MGM_REPORT:
260 case ICMPV6_MGM_REDUCTION:
261 case ICMPV6_MLD2_REPORT:
262 return true;
263 default:
264 break;
265 }
266 return false;
267 }
268
269 void addrconf_prefix_rcv(struct net_device *dev,
270 u8 *opt, int len, bool sllao);
271
272 /*
273 * anycast prototypes (anycast.c)
274 */
275 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
276 const struct in6_addr *addr);
277 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
278 const struct in6_addr *addr);
279 void __ipv6_sock_ac_close(struct sock *sk);
280 void ipv6_sock_ac_close(struct sock *sk);
281
282 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
283 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
284 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
285 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
286 const struct in6_addr *addr);
287 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
288 const struct in6_addr *addr);
289 int ipv6_anycast_init(void);
290 void ipv6_anycast_cleanup(void);
291
292 /* Device notifier */
293 int register_inet6addr_notifier(struct notifier_block *nb);
294 int unregister_inet6addr_notifier(struct notifier_block *nb);
295 int inet6addr_notifier_call_chain(unsigned long val, void *v);
296
297 int register_inet6addr_validator_notifier(struct notifier_block *nb);
298 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
299 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
300
301 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
302 int ifindex, struct ipv6_devconf *devconf);
303
304 /**
305 * __in6_dev_get - get inet6_dev pointer from netdevice
306 * @dev: network device
307 *
308 * Caller must hold rcu_read_lock or RTNL, because this function
309 * does not take a reference on the inet6_dev.
310 */
__in6_dev_get(const struct net_device * dev)311 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
312 {
313 return rcu_dereference_rtnl(dev->ip6_ptr);
314 }
315
316 /**
317 * __in6_dev_stats_get - get inet6_dev pointer for stats
318 * @dev: network device
319 * @skb: skb for original incoming interface if neeeded
320 *
321 * Caller must hold rcu_read_lock or RTNL, because this function
322 * does not take a reference on the inet6_dev.
323 */
__in6_dev_stats_get(const struct net_device * dev,const struct sk_buff * skb)324 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
325 const struct sk_buff *skb)
326 {
327 if (netif_is_l3_master(dev))
328 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
329 return __in6_dev_get(dev);
330 }
331
332 /**
333 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
334 * @dev: network device
335 *
336 * This is a safer version of __in6_dev_get
337 */
__in6_dev_get_safely(const struct net_device * dev)338 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
339 {
340 if (likely(dev))
341 return rcu_dereference_rtnl(dev->ip6_ptr);
342 else
343 return NULL;
344 }
345
346 /**
347 * in6_dev_get - get inet6_dev pointer from netdevice
348 * @dev: network device
349 *
350 * This version can be used in any context, and takes a reference
351 * on the inet6_dev. Callers must use in6_dev_put() later to
352 * release this reference.
353 */
in6_dev_get(const struct net_device * dev)354 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
355 {
356 struct inet6_dev *idev;
357
358 rcu_read_lock();
359 idev = rcu_dereference(dev->ip6_ptr);
360 if (idev)
361 refcount_inc(&idev->refcnt);
362 rcu_read_unlock();
363 return idev;
364 }
365
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)366 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
367 {
368 struct inet6_dev *idev = __in6_dev_get(dev);
369
370 return idev ? idev->nd_parms : NULL;
371 }
372
373 void in6_dev_finish_destroy(struct inet6_dev *idev);
374
in6_dev_put(struct inet6_dev * idev)375 static inline void in6_dev_put(struct inet6_dev *idev)
376 {
377 if (refcount_dec_and_test(&idev->refcnt))
378 in6_dev_finish_destroy(idev);
379 }
380
in6_dev_put_clear(struct inet6_dev ** pidev)381 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
382 {
383 struct inet6_dev *idev = *pidev;
384
385 if (idev) {
386 in6_dev_put(idev);
387 *pidev = NULL;
388 }
389 }
390
__in6_dev_put(struct inet6_dev * idev)391 static inline void __in6_dev_put(struct inet6_dev *idev)
392 {
393 refcount_dec(&idev->refcnt);
394 }
395
in6_dev_hold(struct inet6_dev * idev)396 static inline void in6_dev_hold(struct inet6_dev *idev)
397 {
398 refcount_inc(&idev->refcnt);
399 }
400
401 /* called with rcu_read_lock held */
ip6_ignore_linkdown(const struct net_device * dev)402 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
403 {
404 const struct inet6_dev *idev = __in6_dev_get(dev);
405
406 return !!idev->cnf.ignore_routes_with_linkdown;
407 }
408
409 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
410
in6_ifa_put(struct inet6_ifaddr * ifp)411 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
412 {
413 if (refcount_dec_and_test(&ifp->refcnt))
414 inet6_ifa_finish_destroy(ifp);
415 }
416
__in6_ifa_put(struct inet6_ifaddr * ifp)417 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
418 {
419 refcount_dec(&ifp->refcnt);
420 }
421
in6_ifa_hold(struct inet6_ifaddr * ifp)422 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
423 {
424 refcount_inc(&ifp->refcnt);
425 }
426
427
428 /*
429 * compute link-local solicited-node multicast address
430 */
431
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)432 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
433 struct in6_addr *solicited)
434 {
435 ipv6_addr_set(solicited,
436 htonl(0xFF020000), 0,
437 htonl(0x1),
438 htonl(0xFF000000) | addr->s6_addr32[3]);
439 }
440
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)441 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
442 {
443 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
444 __be64 *p = (__force __be64 *)addr;
445 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
446 #else
447 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
448 addr->s6_addr32[1] | addr->s6_addr32[2] |
449 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
450 #endif
451 }
452
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)453 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
454 {
455 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
456 __be64 *p = (__force __be64 *)addr;
457 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
458 #else
459 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
460 addr->s6_addr32[1] | addr->s6_addr32[2] |
461 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
462 #endif
463 }
464
ipv6_addr_is_isatap(const struct in6_addr * addr)465 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
466 {
467 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
468 }
469
ipv6_addr_is_solict_mult(const struct in6_addr * addr)470 static inline bool ipv6_addr_is_solict_mult(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)) |
475 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
476 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
477 #else
478 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
479 addr->s6_addr32[1] |
480 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
481 (addr->s6_addr[12] ^ 0xff)) == 0;
482 #endif
483 }
484
ipv6_addr_is_all_snoopers(const struct in6_addr * addr)485 static inline bool ipv6_addr_is_all_snoopers(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
490 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
491 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
492 #else
493 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
494 addr->s6_addr32[1] | addr->s6_addr32[2] |
495 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
496 #endif
497 }
498
499 #ifdef CONFIG_PROC_FS
500 int if6_proc_init(void);
501 void if6_proc_exit(void);
502 #endif
503
504 #endif
505
