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 | u8 ifa_proto; |
68 | |
69 | const struct in6_addr *peer_pfx; |
70 | |
71 | u32 rt_priority; |
72 | u32 ifa_flags; |
73 | u32 preferred_lft; |
74 | u32 valid_lft; |
75 | u16 scope; |
76 | }; |
77 | |
78 | int addrconf_init(void); |
79 | void addrconf_cleanup(void); |
80 | |
81 | int addrconf_add_ifaddr(struct net *net, void __user *arg); |
82 | int addrconf_del_ifaddr(struct net *net, void __user *arg); |
83 | int addrconf_set_dstaddr(struct net *net, void __user *arg); |
84 | |
85 | int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, |
86 | const struct net_device *dev, int strict); |
87 | int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, |
88 | const struct net_device *dev, bool skip_dev_check, |
89 | int strict, u32 banned_flags); |
90 | |
91 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
92 | int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); |
93 | #endif |
94 | |
95 | int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, |
96 | unsigned char nsegs); |
97 | |
98 | bool ipv6_chk_custom_prefix(const struct in6_addr *addr, |
99 | const unsigned int prefix_len, |
100 | struct net_device *dev); |
101 | |
102 | int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); |
103 | |
104 | struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, |
105 | struct net_device *dev); |
106 | |
107 | struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, |
108 | const struct in6_addr *addr, |
109 | struct net_device *dev, int strict); |
110 | |
111 | int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, |
112 | const struct in6_addr *daddr, unsigned int srcprefs, |
113 | struct in6_addr *saddr); |
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 | |
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 | |
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 | |
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, addr: 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 | |
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 | |
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 | */ |
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(const 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 | */ |
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, len: 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 | /* |
275 | * anycast prototypes (anycast.c) |
276 | */ |
277 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, |
278 | const struct in6_addr *addr); |
279 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, |
280 | const struct in6_addr *addr); |
281 | void __ipv6_sock_ac_close(struct sock *sk); |
282 | void ipv6_sock_ac_close(struct sock *sk); |
283 | |
284 | int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); |
285 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); |
286 | void ipv6_ac_destroy_dev(struct inet6_dev *idev); |
287 | bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, |
288 | const struct in6_addr *addr); |
289 | bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, |
290 | const struct in6_addr *addr); |
291 | int ipv6_anycast_init(void); |
292 | void ipv6_anycast_cleanup(void); |
293 | |
294 | /* Device notifier */ |
295 | int register_inet6addr_notifier(struct notifier_block *nb); |
296 | int unregister_inet6addr_notifier(struct notifier_block *nb); |
297 | int inet6addr_notifier_call_chain(unsigned long val, void *v); |
298 | |
299 | int register_inet6addr_validator_notifier(struct notifier_block *nb); |
300 | int unregister_inet6addr_validator_notifier(struct notifier_block *nb); |
301 | int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); |
302 | |
303 | void inet6_netconf_notify_devconf(struct net *net, int event, int type, |
304 | int ifindex, struct ipv6_devconf *devconf); |
305 | |
306 | /** |
307 | * __in6_dev_get - get inet6_dev pointer from netdevice |
308 | * @dev: network device |
309 | * |
310 | * Caller must hold rcu_read_lock or RTNL, because this function |
311 | * does not take a reference on the inet6_dev. |
312 | */ |
313 | static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) |
314 | { |
315 | return rcu_dereference_rtnl(dev->ip6_ptr); |
316 | } |
317 | |
318 | /** |
319 | * __in6_dev_stats_get - get inet6_dev pointer for stats |
320 | * @dev: network device |
321 | * @skb: skb for original incoming interface if neeeded |
322 | * |
323 | * Caller must hold rcu_read_lock or RTNL, because this function |
324 | * does not take a reference on the inet6_dev. |
325 | */ |
326 | static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev, |
327 | const struct sk_buff *skb) |
328 | { |
329 | if (netif_is_l3_master(dev)) |
330 | dev = dev_get_by_index_rcu(net: dev_net(dev), ifindex: inet6_iif(skb)); |
331 | return __in6_dev_get(dev); |
332 | } |
333 | |
334 | /** |
335 | * __in6_dev_get_safely - get inet6_dev pointer from netdevice |
336 | * @dev: network device |
337 | * |
338 | * This is a safer version of __in6_dev_get |
339 | */ |
340 | static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) |
341 | { |
342 | if (likely(dev)) |
343 | return rcu_dereference_rtnl(dev->ip6_ptr); |
344 | else |
345 | return NULL; |
346 | } |
347 | |
348 | /** |
349 | * in6_dev_get - get inet6_dev pointer from netdevice |
350 | * @dev: network device |
351 | * |
352 | * This version can be used in any context, and takes a reference |
353 | * on the inet6_dev. Callers must use in6_dev_put() later to |
354 | * release this reference. |
355 | */ |
356 | static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) |
357 | { |
358 | struct inet6_dev *idev; |
359 | |
360 | rcu_read_lock(); |
361 | idev = rcu_dereference(dev->ip6_ptr); |
362 | if (idev) |
363 | refcount_inc(r: &idev->refcnt); |
364 | rcu_read_unlock(); |
365 | return idev; |
366 | } |
367 | |
368 | static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) |
369 | { |
370 | struct inet6_dev *idev = __in6_dev_get(dev); |
371 | |
372 | return idev ? idev->nd_parms : NULL; |
373 | } |
374 | |
375 | void in6_dev_finish_destroy(struct inet6_dev *idev); |
376 | |
377 | static inline void in6_dev_put(struct inet6_dev *idev) |
378 | { |
379 | if (refcount_dec_and_test(r: &idev->refcnt)) |
380 | in6_dev_finish_destroy(idev); |
381 | } |
382 | |
383 | static inline void in6_dev_put_clear(struct inet6_dev **pidev) |
384 | { |
385 | struct inet6_dev *idev = *pidev; |
386 | |
387 | if (idev) { |
388 | in6_dev_put(idev); |
389 | *pidev = NULL; |
390 | } |
391 | } |
392 | |
393 | static inline void __in6_dev_put(struct inet6_dev *idev) |
394 | { |
395 | refcount_dec(r: &idev->refcnt); |
396 | } |
397 | |
398 | static inline void in6_dev_hold(struct inet6_dev *idev) |
399 | { |
400 | refcount_inc(r: &idev->refcnt); |
401 | } |
402 | |
403 | /* called with rcu_read_lock held */ |
404 | static inline bool ip6_ignore_linkdown(const struct net_device *dev) |
405 | { |
406 | const struct inet6_dev *idev = __in6_dev_get(dev); |
407 | |
408 | if (unlikely(!idev)) |
409 | return true; |
410 | |
411 | return !!idev->cnf.ignore_routes_with_linkdown; |
412 | } |
413 | |
414 | void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); |
415 | |
416 | static inline void in6_ifa_put(struct inet6_ifaddr *ifp) |
417 | { |
418 | if (refcount_dec_and_test(r: &ifp->refcnt)) |
419 | inet6_ifa_finish_destroy(ifp); |
420 | } |
421 | |
422 | static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) |
423 | { |
424 | refcount_dec(r: &ifp->refcnt); |
425 | } |
426 | |
427 | static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) |
428 | { |
429 | refcount_inc(r: &ifp->refcnt); |
430 | } |
431 | |
432 | |
433 | /* |
434 | * compute link-local solicited-node multicast address |
435 | */ |
436 | |
437 | static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, |
438 | struct in6_addr *solicited) |
439 | { |
440 | ipv6_addr_set(addr: solicited, |
441 | htonl(0xFF020000), w2: 0, |
442 | htonl(0x1), |
443 | htonl(0xFF000000) | addr->s6_addr32[3]); |
444 | } |
445 | |
446 | static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) |
447 | { |
448 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
449 | __be64 *p = (__force __be64 *)addr; |
450 | return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; |
451 | #else |
452 | return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | |
453 | addr->s6_addr32[1] | addr->s6_addr32[2] | |
454 | (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; |
455 | #endif |
456 | } |
457 | |
458 | static inline bool ipv6_addr_is_ll_all_routers(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(2))) == 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(0x00000002))) == 0; |
467 | #endif |
468 | } |
469 | |
470 | static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) |
471 | { |
472 | return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); |
473 | } |
474 | |
475 | static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) |
476 | { |
477 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
478 | __be64 *p = (__force __be64 *)addr; |
479 | return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | |
480 | ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & |
481 | cpu_to_be64(0xffffffffff000000UL))) == 0UL; |
482 | #else |
483 | return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | |
484 | addr->s6_addr32[1] | |
485 | (addr->s6_addr32[2] ^ htonl(0x00000001)) | |
486 | (addr->s6_addr[12] ^ 0xff)) == 0; |
487 | #endif |
488 | } |
489 | |
490 | static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr) |
491 | { |
492 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
493 | __be64 *p = (__force __be64 *)addr; |
494 | |
495 | return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | |
496 | (p[1] ^ cpu_to_be64(0x6a))) == 0UL; |
497 | #else |
498 | return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | |
499 | addr->s6_addr32[1] | addr->s6_addr32[2] | |
500 | (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0; |
501 | #endif |
502 | } |
503 | |
504 | #ifdef CONFIG_PROC_FS |
505 | int if6_proc_init(void); |
506 | void if6_proc_exit(void); |
507 | #endif |
508 | |
509 | #endif |
510 | |