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 TEMP_VALID_LIFETIME (7*86400)
10 #define TEMP_PREFERRED_LIFETIME (86400)
11 #define REGEN_MAX_RETRY (3)
12 #define MAX_DESYNC_FACTOR (600)
14 #define ADDR_CHECK_FREQUENCY (120*HZ)
16 #define IPV6_MAX_ADDRESSES 16
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)
22 #define ADDRCONF_NOTIFY_PRIORITY 0
25 #include <linux/in6.h>
32 #if defined(__BIG_ENDIAN_BITFIELD)
36 #elif defined(__LITTLE_ENDIAN_BITFIELD)
41 #error "Please fix <asm/byteorder.h>"
47 struct in6_addr prefix;
50 #include <linux/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <net/if_inet6.h>
55 struct in6_validator_info {
56 struct in6_addr i6vi_addr;
57 struct inet6_dev *i6vi_dev;
58 struct netlink_ext_ack *extack;
62 const struct in6_addr *pfx;
65 const struct in6_addr *peer_pfx;
74 int addrconf_init(void);
75 void addrconf_cleanup(void);
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);
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);
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);
91 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
94 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
95 const unsigned int prefix_len,
96 struct net_device *dev);
98 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
100 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
101 const struct in6_addr *addr,
102 struct net_device *dev, int strict);
104 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
105 const struct in6_addr *daddr, unsigned int srcprefs,
106 struct in6_addr *saddr);
107 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
109 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
111 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
112 bool match_wildcard);
113 bool inet_rcv_saddr_any(const struct sock *sk);
114 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
115 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
117 void addrconf_add_linklocal(struct inet6_dev *idev,
118 const struct in6_addr *addr, u32 flags);
120 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
121 const struct prefix_info *pinfo,
122 struct inet6_dev *in6_dev,
123 const struct in6_addr *addr, int addr_type,
124 u32 addr_flags, bool sllao, bool tokenized,
125 __u32 valid_lft, u32 prefered_lft);
127 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
129 memcpy(eui, addr, 3);
132 memcpy(eui + 5, addr + 3, 3);
135 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
137 addrconf_addr_eui48_base(eui, addr);
141 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
143 if (dev->addr_len != ETH_ALEN)
147 * The zSeries OSA network cards can be shared among various
148 * OS instances, but the OSA cards have only one MAC address.
149 * This leads to duplicate address conflicts in conjunction
150 * with IPv6 if more than one instance uses the same card.
152 * The driver for these cards can deliver a unique 16-bit
153 * identifier for each instance sharing the same card. It is
154 * placed instead of 0xFFFE in the interface identifier. The
155 * "u" bit of the interface identifier is not inverted in this
156 * case. Hence the resulting interface identifier has local
157 * scope according to RFC2373.
160 addrconf_addr_eui48_base(eui, dev->dev_addr);
163 eui[3] = (dev->dev_id >> 8) & 0xFF;
164 eui[4] = dev->dev_id & 0xFF;
172 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
175 if (timeout == 0xffffffff)
179 * Avoid arithmetic overflow.
180 * Assuming unit is constant and non-zero, this "if" statement
181 * will go away on 64bit archs.
183 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
184 return LONG_MAX / unit;
189 static inline int addrconf_finite_timeout(unsigned long timeout)
195 * IPv6 Address Label subsystem (addrlabel.c)
197 int ipv6_addr_label_init(void);
198 void ipv6_addr_label_cleanup(void);
199 int ipv6_addr_label_rtnl_register(void);
200 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
201 int type, int ifindex);
204 * multicast prototypes (mcast.c)
206 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
209 if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
212 return pskb_may_pull(skb, len);
215 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
216 const struct in6_addr *addr);
217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
218 const struct in6_addr *addr);
219 void __ipv6_sock_mc_close(struct sock *sk);
220 void ipv6_sock_mc_close(struct sock *sk);
221 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
222 const struct in6_addr *src_addr);
224 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
225 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
226 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
227 void ipv6_mc_up(struct inet6_dev *idev);
228 void ipv6_mc_down(struct inet6_dev *idev);
229 void ipv6_mc_unmap(struct inet6_dev *idev);
230 void ipv6_mc_remap(struct inet6_dev *idev);
231 void ipv6_mc_init_dev(struct inet6_dev *idev);
232 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
233 int ipv6_mc_check_icmpv6(struct sk_buff *skb);
234 int ipv6_mc_check_mld(struct sk_buff *skb);
235 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
237 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
238 const struct in6_addr *src_addr);
240 void ipv6_mc_dad_complete(struct inet6_dev *idev);
243 * identify MLD packets for MLD filter exceptions
245 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
247 struct icmp6hdr *hdr;
249 if (nexthdr != IPPROTO_ICMPV6 ||
250 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
253 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
255 switch (hdr->icmp6_type) {
256 case ICMPV6_MGM_QUERY:
257 case ICMPV6_MGM_REPORT:
258 case ICMPV6_MGM_REDUCTION:
259 case ICMPV6_MLD2_REPORT:
267 void addrconf_prefix_rcv(struct net_device *dev,
268 u8 *opt, int len, bool sllao);
271 * anycast prototypes (anycast.c)
273 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
274 const struct in6_addr *addr);
275 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
276 const struct in6_addr *addr);
277 void ipv6_sock_ac_close(struct sock *sk);
279 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
280 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
281 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
282 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
283 const struct in6_addr *addr);
284 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
285 const struct in6_addr *addr);
286 int ipv6_anycast_init(void);
287 void ipv6_anycast_cleanup(void);
289 /* Device notifier */
290 int register_inet6addr_notifier(struct notifier_block *nb);
291 int unregister_inet6addr_notifier(struct notifier_block *nb);
292 int inet6addr_notifier_call_chain(unsigned long val, void *v);
294 int register_inet6addr_validator_notifier(struct notifier_block *nb);
295 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
296 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
298 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
299 int ifindex, struct ipv6_devconf *devconf);
302 * __in6_dev_get - get inet6_dev pointer from netdevice
303 * @dev: network device
305 * Caller must hold rcu_read_lock or RTNL, because this function
306 * does not take a reference on the inet6_dev.
308 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
310 return rcu_dereference_rtnl(dev->ip6_ptr);
314 * __in6_dev_stats_get - get inet6_dev pointer for stats
315 * @dev: network device
316 * @skb: skb for original incoming interface if neeeded
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_stats_get(const struct net_device *dev,
322 const struct sk_buff *skb)
324 if (netif_is_l3_master(dev))
325 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
326 return __in6_dev_get(dev);
330 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
331 * @dev: network device
333 * This is a safer version of __in6_dev_get
335 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
338 return rcu_dereference_rtnl(dev->ip6_ptr);
344 * in6_dev_get - get inet6_dev pointer from netdevice
345 * @dev: network device
347 * This version can be used in any context, and takes a reference
348 * on the inet6_dev. Callers must use in6_dev_put() later to
349 * release this reference.
351 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
353 struct inet6_dev *idev;
356 idev = rcu_dereference(dev->ip6_ptr);
358 refcount_inc(&idev->refcnt);
363 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
365 struct inet6_dev *idev = __in6_dev_get(dev);
367 return idev ? idev->nd_parms : NULL;
370 void in6_dev_finish_destroy(struct inet6_dev *idev);
372 static inline void in6_dev_put(struct inet6_dev *idev)
374 if (refcount_dec_and_test(&idev->refcnt))
375 in6_dev_finish_destroy(idev);
378 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
380 struct inet6_dev *idev = *pidev;
388 static inline void __in6_dev_put(struct inet6_dev *idev)
390 refcount_dec(&idev->refcnt);
393 static inline void in6_dev_hold(struct inet6_dev *idev)
395 refcount_inc(&idev->refcnt);
398 /* called with rcu_read_lock held */
399 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
401 const struct inet6_dev *idev = __in6_dev_get(dev);
403 return !!idev->cnf.ignore_routes_with_linkdown;
406 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
408 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
410 if (refcount_dec_and_test(&ifp->refcnt))
411 inet6_ifa_finish_destroy(ifp);
414 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
416 refcount_dec(&ifp->refcnt);
419 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
421 refcount_inc(&ifp->refcnt);
426 * compute link-local solicited-node multicast address
429 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
430 struct in6_addr *solicited)
432 ipv6_addr_set(solicited,
433 htonl(0xFF020000), 0,
435 htonl(0xFF000000) | addr->s6_addr32[3]);
438 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
440 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
441 __be64 *p = (__force __be64 *)addr;
442 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
444 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
445 addr->s6_addr32[1] | addr->s6_addr32[2] |
446 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
450 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
452 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
453 __be64 *p = (__force __be64 *)addr;
454 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
456 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
457 addr->s6_addr32[1] | addr->s6_addr32[2] |
458 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
462 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
464 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
467 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
469 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
470 __be64 *p = (__force __be64 *)addr;
471 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
472 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
473 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
475 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
477 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
478 (addr->s6_addr[12] ^ 0xff)) == 0;
482 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
484 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
485 __be64 *p = (__force __be64 *)addr;
487 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
488 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
490 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
491 addr->s6_addr32[1] | addr->s6_addr32[2] |
492 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
496 #ifdef CONFIG_PROC_FS
497 int if6_proc_init(void);
498 void if6_proc_exit(void);