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_icmpv6(struct sk_buff *skb);
237 int ipv6_mc_check_mld(struct sk_buff *skb);
238 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
239
240 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
241 const struct in6_addr *src_addr);
242
243 void ipv6_mc_dad_complete(struct inet6_dev *idev);
244
245 /*
246 * identify MLD packets for MLD filter exceptions
247 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)248 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
249 {
250 struct icmp6hdr *hdr;
251
252 if (nexthdr != IPPROTO_ICMPV6 ||
253 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
254 return false;
255
256 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
257
258 switch (hdr->icmp6_type) {
259 case ICMPV6_MGM_QUERY:
260 case ICMPV6_MGM_REPORT:
261 case ICMPV6_MGM_REDUCTION:
262 case ICMPV6_MLD2_REPORT:
263 return true;
264 default:
265 break;
266 }
267 return false;
268 }
269
270 void addrconf_prefix_rcv(struct net_device *dev,
271 u8 *opt, int len, bool sllao);
272
273 /*
274 * anycast prototypes (anycast.c)
275 */
276 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
277 const struct in6_addr *addr);
278 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
279 const struct in6_addr *addr);
280 void __ipv6_sock_ac_close(struct sock *sk);
281 void ipv6_sock_ac_close(struct sock *sk);
282
283 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
284 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
285 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
286 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
287 const struct in6_addr *addr);
288 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
289 const struct in6_addr *addr);
290 int ipv6_anycast_init(void);
291 void ipv6_anycast_cleanup(void);
292
293 /* Device notifier */
294 int register_inet6addr_notifier(struct notifier_block *nb);
295 int unregister_inet6addr_notifier(struct notifier_block *nb);
296 int inet6addr_notifier_call_chain(unsigned long val, void *v);
297
298 int register_inet6addr_validator_notifier(struct notifier_block *nb);
299 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
300 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
301
302 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
303 int ifindex, struct ipv6_devconf *devconf);
304
305 /**
306 * __in6_dev_get - get inet6_dev pointer from netdevice
307 * @dev: network device
308 *
309 * Caller must hold rcu_read_lock or RTNL, because this function
310 * does not take a reference on the inet6_dev.
311 */
__in6_dev_get(const struct net_device * dev)312 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
313 {
314 return rcu_dereference_rtnl(dev->ip6_ptr);
315 }
316
317 /**
318 * __in6_dev_stats_get - get inet6_dev pointer for stats
319 * @dev: network device
320 * @skb: skb for original incoming interface if neeeded
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_stats_get(const struct net_device * dev,const struct sk_buff * skb)325 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
326 const struct sk_buff *skb)
327 {
328 if (netif_is_l3_master(dev))
329 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
330 return __in6_dev_get(dev);
331 }
332
333 /**
334 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
335 * @dev: network device
336 *
337 * This is a safer version of __in6_dev_get
338 */
__in6_dev_get_safely(const struct net_device * dev)339 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
340 {
341 if (likely(dev))
342 return rcu_dereference_rtnl(dev->ip6_ptr);
343 else
344 return NULL;
345 }
346
347 /**
348 * in6_dev_get - get inet6_dev pointer from netdevice
349 * @dev: network device
350 *
351 * This version can be used in any context, and takes a reference
352 * on the inet6_dev. Callers must use in6_dev_put() later to
353 * release this reference.
354 */
in6_dev_get(const struct net_device * dev)355 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
356 {
357 struct inet6_dev *idev;
358
359 rcu_read_lock();
360 idev = rcu_dereference(dev->ip6_ptr);
361 if (idev)
362 refcount_inc(&idev->refcnt);
363 rcu_read_unlock();
364 return idev;
365 }
366
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)367 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
368 {
369 struct inet6_dev *idev = __in6_dev_get(dev);
370
371 return idev ? idev->nd_parms : NULL;
372 }
373
374 void in6_dev_finish_destroy(struct inet6_dev *idev);
375
in6_dev_put(struct inet6_dev * idev)376 static inline void in6_dev_put(struct inet6_dev *idev)
377 {
378 if (refcount_dec_and_test(&idev->refcnt))
379 in6_dev_finish_destroy(idev);
380 }
381
in6_dev_put_clear(struct inet6_dev ** pidev)382 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
383 {
384 struct inet6_dev *idev = *pidev;
385
386 if (idev) {
387 in6_dev_put(idev);
388 *pidev = NULL;
389 }
390 }
391
__in6_dev_put(struct inet6_dev * idev)392 static inline void __in6_dev_put(struct inet6_dev *idev)
393 {
394 refcount_dec(&idev->refcnt);
395 }
396
in6_dev_hold(struct inet6_dev * idev)397 static inline void in6_dev_hold(struct inet6_dev *idev)
398 {
399 refcount_inc(&idev->refcnt);
400 }
401
402 /* called with rcu_read_lock held */
ip6_ignore_linkdown(const struct net_device * dev)403 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
404 {
405 const struct inet6_dev *idev = __in6_dev_get(dev);
406
407 return !!idev->cnf.ignore_routes_with_linkdown;
408 }
409
410 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
411
in6_ifa_put(struct inet6_ifaddr * ifp)412 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
413 {
414 if (refcount_dec_and_test(&ifp->refcnt))
415 inet6_ifa_finish_destroy(ifp);
416 }
417
__in6_ifa_put(struct inet6_ifaddr * ifp)418 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
419 {
420 refcount_dec(&ifp->refcnt);
421 }
422
in6_ifa_hold(struct inet6_ifaddr * ifp)423 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
424 {
425 refcount_inc(&ifp->refcnt);
426 }
427
428
429 /*
430 * compute link-local solicited-node multicast address
431 */
432
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)433 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
434 struct in6_addr *solicited)
435 {
436 ipv6_addr_set(solicited,
437 htonl(0xFF020000), 0,
438 htonl(0x1),
439 htonl(0xFF000000) | addr->s6_addr32[3]);
440 }
441
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)442 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
443 {
444 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
445 __be64 *p = (__force __be64 *)addr;
446 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
447 #else
448 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
449 addr->s6_addr32[1] | addr->s6_addr32[2] |
450 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
451 #endif
452 }
453
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)454 static inline bool ipv6_addr_is_ll_all_routers(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(2))) == 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(0x00000002))) == 0;
463 #endif
464 }
465
ipv6_addr_is_isatap(const struct in6_addr * addr)466 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
467 {
468 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
469 }
470
ipv6_addr_is_solict_mult(const struct in6_addr * addr)471 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
472 {
473 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
474 __be64 *p = (__force __be64 *)addr;
475 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
476 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
477 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
478 #else
479 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
480 addr->s6_addr32[1] |
481 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
482 (addr->s6_addr[12] ^ 0xff)) == 0;
483 #endif
484 }
485
ipv6_addr_is_all_snoopers(const struct in6_addr * addr)486 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
487 {
488 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
489 __be64 *p = (__force __be64 *)addr;
490
491 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
492 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
493 #else
494 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
495 addr->s6_addr32[1] | addr->s6_addr32[2] |
496 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
497 #endif
498 }
499
500 #ifdef CONFIG_PROC_FS
501 int if6_proc_init(void);
502 void if6_proc_exit(void);
503 #endif
504
505 #endif
506
