1 /* SPDX-License-Identifier: GPL-2.0 */
5 #define MAX_RTR_SOLICITATIONS -1 /* unlimited */
6 #define RTR_SOLICITATION_INTERVAL (4*HZ)
7 #define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
9 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
11 #define TEMP_VALID_LIFETIME (7*86400) /* 1 week */
12 #define TEMP_PREFERRED_LIFETIME (86400) /* 24 hours */
13 #define REGEN_MIN_ADVANCE (2) /* 2 seconds */
14 #define REGEN_MAX_RETRY (3)
15 #define MAX_DESYNC_FACTOR (600)
17 #define ADDR_CHECK_FREQUENCY (120*HZ)
19 #define IPV6_MAX_ADDRESSES 16
21 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
22 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
23 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
25 #define ADDRCONF_NOTIFY_PRIORITY 0
28 #include <linux/in6.h>
38 #if defined(__BIG_ENDIAN_BITFIELD)
44 #elif defined(__LITTLE_ENDIAN_BITFIELD)
51 #error "Please fix <asm/byteorder.h>"
59 struct in6_addr prefix;
62 /* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
63 static_assert(sizeof(struct prefix_info) == 32);
65 #include <linux/ipv6.h>
66 #include <linux/netdevice.h>
67 #include <net/if_inet6.h>
70 struct in6_validator_info {
71 struct in6_addr i6vi_addr;
72 struct inet6_dev *i6vi_dev;
73 struct netlink_ext_ack *extack;
77 const struct in6_addr *pfx;
82 const struct in6_addr *peer_pfx;
97 struct inet6_fill_args {
104 enum addr_type_t type;
105 bool force_rt_scope_universe;
108 int addrconf_init(void);
109 void addrconf_cleanup(void);
111 int addrconf_add_ifaddr(struct net *net, void __user *arg);
112 int addrconf_del_ifaddr(struct net *net, void __user *arg);
113 int addrconf_set_dstaddr(struct net *net, void __user *arg);
115 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
116 const struct net_device *dev, int strict);
117 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
118 const struct net_device *dev, bool skip_dev_check,
119 int strict, u32 banned_flags);
121 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
122 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
125 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
126 unsigned char nsegs);
128 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
129 const unsigned int prefix_len,
130 struct net_device *dev);
132 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
134 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
135 struct net_device *dev);
137 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
138 const struct in6_addr *addr,
139 struct net_device *dev, int strict);
141 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
142 const struct in6_addr *daddr, unsigned int srcprefs,
143 struct in6_addr *saddr);
144 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
146 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
147 bool match_wildcard);
148 bool inet_rcv_saddr_any(const struct sock *sk);
149 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
150 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
152 void addrconf_add_linklocal(struct inet6_dev *idev,
153 const struct in6_addr *addr, u32 flags);
155 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
156 const struct prefix_info *pinfo,
157 struct inet6_dev *in6_dev,
158 const struct in6_addr *addr, int addr_type,
159 u32 addr_flags, bool sllao, bool tokenized,
160 __u32 valid_lft, u32 prefered_lft);
162 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
164 memcpy(eui, addr, 3);
167 memcpy(eui + 5, addr + 3, 3);
170 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
172 addrconf_addr_eui48_base(eui, addr);
176 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
178 if (dev->addr_len != ETH_ALEN)
182 * The zSeries OSA network cards can be shared among various
183 * OS instances, but the OSA cards have only one MAC address.
184 * This leads to duplicate address conflicts in conjunction
185 * with IPv6 if more than one instance uses the same card.
187 * The driver for these cards can deliver a unique 16-bit
188 * identifier for each instance sharing the same card. It is
189 * placed instead of 0xFFFE in the interface identifier. The
190 * "u" bit of the interface identifier is not inverted in this
191 * case. Hence the resulting interface identifier has local
192 * scope according to RFC2373.
195 addrconf_addr_eui48_base(eui, dev->dev_addr);
198 eui[3] = (dev->dev_id >> 8) & 0xFF;
199 eui[4] = dev->dev_id & 0xFF;
207 #define INFINITY_LIFE_TIME 0xFFFFFFFF
209 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
212 if (timeout == INFINITY_LIFE_TIME)
216 * Avoid arithmetic overflow.
217 * Assuming unit is constant and non-zero, this "if" statement
218 * will go away on 64bit archs.
220 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
221 return LONG_MAX / unit;
226 static inline int addrconf_finite_timeout(unsigned long timeout)
232 * IPv6 Address Label subsystem (addrlabel.c)
234 int ipv6_addr_label_init(void);
235 void ipv6_addr_label_cleanup(void);
236 int ipv6_addr_label_rtnl_register(void);
237 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
238 int type, int ifindex);
241 * multicast prototypes (mcast.c)
243 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
246 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
249 return pskb_may_pull(skb, len);
252 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
253 const struct in6_addr *addr);
254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
255 const struct in6_addr *addr);
256 void __ipv6_sock_mc_close(struct sock *sk);
257 void ipv6_sock_mc_close(struct sock *sk);
258 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
259 const struct in6_addr *src_addr);
261 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
262 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
263 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
264 void ipv6_mc_up(struct inet6_dev *idev);
265 void ipv6_mc_down(struct inet6_dev *idev);
266 void ipv6_mc_unmap(struct inet6_dev *idev);
267 void ipv6_mc_remap(struct inet6_dev *idev);
268 void ipv6_mc_init_dev(struct inet6_dev *idev);
269 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
270 int ipv6_mc_check_mld(struct sk_buff *skb);
271 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
273 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
274 const struct in6_addr *src_addr);
276 void ipv6_mc_dad_complete(struct inet6_dev *idev);
279 * identify MLD packets for MLD filter exceptions
281 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
283 struct icmp6hdr *hdr;
285 if (nexthdr != IPPROTO_ICMPV6 ||
286 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
289 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
291 switch (hdr->icmp6_type) {
292 case ICMPV6_MGM_QUERY:
293 case ICMPV6_MGM_REPORT:
294 case ICMPV6_MGM_REDUCTION:
295 case ICMPV6_MLD2_REPORT:
303 void addrconf_prefix_rcv(struct net_device *dev,
304 u8 *opt, int len, bool sllao);
307 * anycast prototypes (anycast.c)
309 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
310 const struct in6_addr *addr);
311 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
312 const struct in6_addr *addr);
313 void __ipv6_sock_ac_close(struct sock *sk);
314 void ipv6_sock_ac_close(struct sock *sk);
316 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
317 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
318 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
319 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
320 const struct in6_addr *addr);
321 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
322 const struct in6_addr *addr);
323 int ipv6_anycast_init(void);
324 void ipv6_anycast_cleanup(void);
326 /* Device notifier */
327 int register_inet6addr_notifier(struct notifier_block *nb);
328 int unregister_inet6addr_notifier(struct notifier_block *nb);
329 int inet6addr_notifier_call_chain(unsigned long val, void *v);
331 int register_inet6addr_validator_notifier(struct notifier_block *nb);
332 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
333 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
335 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
336 int ifindex, struct ipv6_devconf *devconf);
339 * __in6_dev_get - get inet6_dev pointer from netdevice
340 * @dev: network device
342 * Caller must hold rcu_read_lock or RTNL, because this function
343 * does not take a reference on the inet6_dev.
345 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
347 return rcu_dereference_rtnl(dev->ip6_ptr);
350 static inline struct inet6_dev *__in6_dev_get_rtnl_net(const struct net_device *dev)
352 return rtnl_net_dereference(dev_net(dev), dev->ip6_ptr);
356 * __in6_dev_stats_get - get inet6_dev pointer for stats
357 * @dev: network device
358 * @skb: skb for original incoming interface if needed
360 * Caller must hold rcu_read_lock or RTNL, because this function
361 * does not take a reference on the inet6_dev.
363 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
364 const struct sk_buff *skb)
366 if (netif_is_l3_master(dev))
367 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
368 return __in6_dev_get(dev);
372 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
373 * @dev: network device
375 * This is a safer version of __in6_dev_get
377 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
380 return rcu_dereference_rtnl(dev->ip6_ptr);
386 * in6_dev_get - get inet6_dev pointer from netdevice
387 * @dev: network device
389 * This version can be used in any context, and takes a reference
390 * on the inet6_dev. Callers must use in6_dev_put() later to
391 * release this reference.
393 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
395 struct inet6_dev *idev;
398 idev = rcu_dereference(dev->ip6_ptr);
400 refcount_inc(&idev->refcnt);
405 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
407 struct inet6_dev *idev = __in6_dev_get(dev);
409 return idev ? idev->nd_parms : NULL;
412 void in6_dev_finish_destroy(struct inet6_dev *idev);
414 static inline void in6_dev_put(struct inet6_dev *idev)
416 if (refcount_dec_and_test(&idev->refcnt))
417 in6_dev_finish_destroy(idev);
420 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
422 struct inet6_dev *idev = *pidev;
430 static inline void __in6_dev_put(struct inet6_dev *idev)
432 refcount_dec(&idev->refcnt);
435 static inline void in6_dev_hold(struct inet6_dev *idev)
437 refcount_inc(&idev->refcnt);
440 /* called with rcu_read_lock held */
441 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
443 const struct inet6_dev *idev = __in6_dev_get(dev);
448 return !!READ_ONCE(idev->cnf.ignore_routes_with_linkdown);
451 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
453 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
455 if (refcount_dec_and_test(&ifp->refcnt))
456 inet6_ifa_finish_destroy(ifp);
459 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
461 refcount_dec(&ifp->refcnt);
464 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
466 refcount_inc(&ifp->refcnt);
469 static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
471 return refcount_inc_not_zero(&ifp->refcnt);
475 * compute link-local solicited-node multicast address
478 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
479 struct in6_addr *solicited)
481 ipv6_addr_set(solicited,
482 htonl(0xFF020000), 0,
484 htonl(0xFF000000) | addr->s6_addr32[3]);
487 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
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)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
493 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
494 addr->s6_addr32[1] | addr->s6_addr32[2] |
495 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
499 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
501 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
502 __be64 *p = (__force __be64 *)addr;
503 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
505 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
506 addr->s6_addr32[1] | addr->s6_addr32[2] |
507 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
511 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
513 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
516 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
518 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
519 __be64 *p = (__force __be64 *)addr;
520 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
521 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
522 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
524 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
526 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
527 (addr->s6_addr[12] ^ 0xff)) == 0;
531 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
533 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
534 __be64 *p = (__force __be64 *)addr;
536 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
537 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
539 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
540 addr->s6_addr32[1] | addr->s6_addr32[2] |
541 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
545 #ifdef CONFIG_PROC_FS
546 int if6_proc_init(void);
547 void if6_proc_exit(void);
550 int inet6_fill_ifmcaddr(struct sk_buff *skb,
551 const struct ifmcaddr6 *ifmca,
552 struct inet6_fill_args *args);
554 int inet6_fill_ifacaddr(struct sk_buff *skb,
555 const struct ifacaddr6 *ifaca,
556 struct inet6_fill_args *args);