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)
12 #define TEMP_PREFERRED_LIFETIME (86400)
13 #define REGEN_MAX_RETRY (3)
14 #define MAX_DESYNC_FACTOR (600)
16 #define ADDR_CHECK_FREQUENCY (120*HZ)
18 #define IPV6_MAX_ADDRESSES 16
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)
24 #define ADDRCONF_NOTIFY_PRIORITY 0
27 #include <linux/in6.h>
37 #if defined(__BIG_ENDIAN_BITFIELD)
41 #elif defined(__LITTLE_ENDIAN_BITFIELD)
46 #error "Please fix <asm/byteorder.h>"
54 struct in6_addr prefix;
57 /* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
58 static_assert(sizeof(struct prefix_info) == 32);
60 #include <linux/ipv6.h>
61 #include <linux/netdevice.h>
62 #include <net/if_inet6.h>
65 struct in6_validator_info {
66 struct in6_addr i6vi_addr;
67 struct inet6_dev *i6vi_dev;
68 struct netlink_ext_ack *extack;
72 const struct in6_addr *pfx;
75 const struct in6_addr *peer_pfx;
84 int addrconf_init(void);
85 void addrconf_cleanup(void);
87 int addrconf_add_ifaddr(struct net *net, void __user *arg);
88 int addrconf_del_ifaddr(struct net *net, void __user *arg);
89 int addrconf_set_dstaddr(struct net *net, void __user *arg);
91 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
92 const struct net_device *dev, int strict);
93 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
94 const struct net_device *dev, bool skip_dev_check,
95 int strict, u32 banned_flags);
97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
98 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
101 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
102 unsigned char nsegs);
104 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
105 const unsigned int prefix_len,
106 struct net_device *dev);
108 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
110 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
111 struct net_device *dev);
113 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
114 const struct in6_addr *addr,
115 struct net_device *dev, int strict);
117 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
118 const struct in6_addr *daddr, unsigned int srcprefs,
119 struct in6_addr *saddr);
120 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
122 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
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);
130 void addrconf_add_linklocal(struct inet6_dev *idev,
131 const struct in6_addr *addr, u32 flags);
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);
140 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
142 memcpy(eui, addr, 3);
145 memcpy(eui + 5, addr + 3, 3);
148 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
150 addrconf_addr_eui48_base(eui, addr);
154 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
156 if (dev->addr_len != ETH_ALEN)
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.
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.
173 addrconf_addr_eui48_base(eui, dev->dev_addr);
176 eui[3] = (dev->dev_id >> 8) & 0xFF;
177 eui[4] = dev->dev_id & 0xFF;
185 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
188 if (timeout == 0xffffffff)
192 * Avoid arithmetic overflow.
193 * Assuming unit is constant and non-zero, this "if" statement
194 * will go away on 64bit archs.
196 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
197 return LONG_MAX / unit;
202 static inline int addrconf_finite_timeout(unsigned long timeout)
208 * IPv6 Address Label subsystem (addrlabel.c)
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);
217 * multicast prototypes (mcast.c)
219 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
222 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
225 return pskb_may_pull(skb, len);
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(struct sock *sk, const struct in6_addr *mc_addr,
235 const struct in6_addr *src_addr);
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);
249 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
250 const struct in6_addr *src_addr);
252 void ipv6_mc_dad_complete(struct inet6_dev *idev);
255 * identify MLD packets for MLD filter exceptions
257 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
259 struct icmp6hdr *hdr;
261 if (nexthdr != IPPROTO_ICMPV6 ||
262 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
265 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
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:
279 void addrconf_prefix_rcv(struct net_device *dev,
280 u8 *opt, int len, bool sllao);
283 * anycast prototypes (anycast.c)
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);
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);
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);
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);
311 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
312 int ifindex, struct ipv6_devconf *devconf);
315 * __in6_dev_get - get inet6_dev pointer from netdevice
316 * @dev: network device
318 * Caller must hold rcu_read_lock or RTNL, because this function
319 * does not take a reference on the inet6_dev.
321 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
323 return rcu_dereference_rtnl(dev->ip6_ptr);
327 * __in6_dev_stats_get - get inet6_dev pointer for stats
328 * @dev: network device
329 * @skb: skb for original incoming interface if neeeded
331 * Caller must hold rcu_read_lock or RTNL, because this function
332 * does not take a reference on the inet6_dev.
334 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
335 const struct sk_buff *skb)
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);
343 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
344 * @dev: network device
346 * This is a safer version of __in6_dev_get
348 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
351 return rcu_dereference_rtnl(dev->ip6_ptr);
357 * in6_dev_get - get inet6_dev pointer from netdevice
358 * @dev: network device
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.
364 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
366 struct inet6_dev *idev;
369 idev = rcu_dereference(dev->ip6_ptr);
371 refcount_inc(&idev->refcnt);
376 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
378 struct inet6_dev *idev = __in6_dev_get(dev);
380 return idev ? idev->nd_parms : NULL;
383 void in6_dev_finish_destroy(struct inet6_dev *idev);
385 static inline void in6_dev_put(struct inet6_dev *idev)
387 if (refcount_dec_and_test(&idev->refcnt))
388 in6_dev_finish_destroy(idev);
391 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
393 struct inet6_dev *idev = *pidev;
401 static inline void __in6_dev_put(struct inet6_dev *idev)
403 refcount_dec(&idev->refcnt);
406 static inline void in6_dev_hold(struct inet6_dev *idev)
408 refcount_inc(&idev->refcnt);
411 /* called with rcu_read_lock held */
412 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
414 const struct inet6_dev *idev = __in6_dev_get(dev);
419 return !!idev->cnf.ignore_routes_with_linkdown;
422 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
424 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
426 if (refcount_dec_and_test(&ifp->refcnt))
427 inet6_ifa_finish_destroy(ifp);
430 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
432 refcount_dec(&ifp->refcnt);
435 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
437 refcount_inc(&ifp->refcnt);
440 static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
442 return refcount_inc_not_zero(&ifp->refcnt);
446 * compute link-local solicited-node multicast address
449 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
450 struct in6_addr *solicited)
452 ipv6_addr_set(solicited,
453 htonl(0xFF020000), 0,
455 htonl(0xFF000000) | addr->s6_addr32[3]);
458 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
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(1))) == 0UL;
464 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
465 addr->s6_addr32[1] | addr->s6_addr32[2] |
466 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
470 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
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)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
476 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
477 addr->s6_addr32[1] | addr->s6_addr32[2] |
478 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
482 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
484 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
487 static inline bool ipv6_addr_is_solict_mult(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)) |
492 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
493 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
495 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
497 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
498 (addr->s6_addr[12] ^ 0xff)) == 0;
502 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
504 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
505 __be64 *p = (__force __be64 *)addr;
507 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
508 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
510 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
511 addr->s6_addr32[1] | addr->s6_addr32[2] |
512 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
516 #ifdef CONFIG_PROC_FS
517 int if6_proc_init(void);
518 void if6_proc_exit(void);