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>
34 #if defined(__BIG_ENDIAN_BITFIELD)
38 #elif defined(__LITTLE_ENDIAN_BITFIELD)
43 #error "Please fix <asm/byteorder.h>"
49 struct in6_addr prefix;
52 #include <linux/netdevice.h>
53 #include <net/if_inet6.h>
56 struct in6_validator_info {
57 struct in6_addr i6vi_addr;
58 struct inet6_dev *i6vi_dev;
61 #define IN6_ADDR_HSIZE_SHIFT 4
62 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
64 int addrconf_init(void);
65 void addrconf_cleanup(void);
67 int addrconf_add_ifaddr(struct net *net, void __user *arg);
68 int addrconf_del_ifaddr(struct net *net, void __user *arg);
69 int addrconf_set_dstaddr(struct net *net, void __user *arg);
71 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
72 const struct net_device *dev, int strict);
73 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
74 const struct net_device *dev, int strict,
77 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
78 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
81 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
82 const unsigned int prefix_len,
83 struct net_device *dev);
85 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
87 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
88 const struct in6_addr *addr,
89 struct net_device *dev, int strict);
91 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
92 const struct in6_addr *daddr, unsigned int srcprefs,
93 struct in6_addr *saddr);
94 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
96 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
98 int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
100 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
101 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
103 void addrconf_add_linklocal(struct inet6_dev *idev,
104 const struct in6_addr *addr, u32 flags);
106 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
107 const struct prefix_info *pinfo,
108 struct inet6_dev *in6_dev,
109 const struct in6_addr *addr, int addr_type,
110 u32 addr_flags, bool sllao, bool tokenized,
111 __u32 valid_lft, u32 prefered_lft);
113 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
115 memcpy(eui, addr, 3);
118 memcpy(eui + 5, addr + 3, 3);
121 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
123 addrconf_addr_eui48_base(eui, addr);
127 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
129 if (dev->addr_len != ETH_ALEN)
133 * The zSeries OSA network cards can be shared among various
134 * OS instances, but the OSA cards have only one MAC address.
135 * This leads to duplicate address conflicts in conjunction
136 * with IPv6 if more than one instance uses the same card.
138 * The driver for these cards can deliver a unique 16-bit
139 * identifier for each instance sharing the same card. It is
140 * placed instead of 0xFFFE in the interface identifier. The
141 * "u" bit of the interface identifier is not inverted in this
142 * case. Hence the resulting interface identifier has local
143 * scope according to RFC2373.
146 addrconf_addr_eui48_base(eui, dev->dev_addr);
149 eui[3] = (dev->dev_id >> 8) & 0xFF;
150 eui[4] = dev->dev_id & 0xFF;
158 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
161 if (timeout == 0xffffffff)
165 * Avoid arithmetic overflow.
166 * Assuming unit is constant and non-zero, this "if" statement
167 * will go away on 64bit archs.
169 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
170 return LONG_MAX / unit;
175 static inline int addrconf_finite_timeout(unsigned long timeout)
181 * IPv6 Address Label subsystem (addrlabel.c)
183 int ipv6_addr_label_init(void);
184 void ipv6_addr_label_cleanup(void);
185 void ipv6_addr_label_rtnl_register(void);
186 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
187 int type, int ifindex);
190 * multicast prototypes (mcast.c)
192 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
193 const struct in6_addr *addr);
194 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
195 const struct in6_addr *addr);
196 void __ipv6_sock_mc_close(struct sock *sk);
197 void ipv6_sock_mc_close(struct sock *sk);
198 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
199 const struct in6_addr *src_addr);
201 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
202 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
203 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
204 void ipv6_mc_up(struct inet6_dev *idev);
205 void ipv6_mc_down(struct inet6_dev *idev);
206 void ipv6_mc_unmap(struct inet6_dev *idev);
207 void ipv6_mc_remap(struct inet6_dev *idev);
208 void ipv6_mc_init_dev(struct inet6_dev *idev);
209 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
210 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
211 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
213 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
214 const struct in6_addr *src_addr);
216 void ipv6_mc_dad_complete(struct inet6_dev *idev);
218 /* A stub used by vxlan module. This is ugly, ideally these
219 * symbols should be built into the core kernel.
222 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
223 const struct in6_addr *addr);
224 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
225 const struct in6_addr *addr);
226 struct dst_entry *(*ipv6_dst_lookup_flow)(struct net *net,
227 const struct sock *sk,
229 const struct in6_addr *final_dst);
230 void (*udpv6_encap_enable)(void);
231 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
232 const struct in6_addr *solicited_addr,
233 bool router, bool solicited, bool override, bool inc_opt);
234 struct neigh_table *nd_tbl;
236 extern const struct ipv6_stub *ipv6_stub __read_mostly;
239 * identify MLD packets for MLD filter exceptions
241 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
243 struct icmp6hdr *hdr;
245 if (nexthdr != IPPROTO_ICMPV6 ||
246 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
249 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
251 switch (hdr->icmp6_type) {
252 case ICMPV6_MGM_QUERY:
253 case ICMPV6_MGM_REPORT:
254 case ICMPV6_MGM_REDUCTION:
255 case ICMPV6_MLD2_REPORT:
263 void addrconf_prefix_rcv(struct net_device *dev,
264 u8 *opt, int len, bool sllao);
267 * anycast prototypes (anycast.c)
269 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
270 const struct in6_addr *addr);
271 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
272 const struct in6_addr *addr);
273 void __ipv6_sock_ac_close(struct sock *sk);
274 void ipv6_sock_ac_close(struct sock *sk);
276 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
277 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
278 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
279 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
280 const struct in6_addr *addr);
281 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
282 const struct in6_addr *addr);
284 /* Device notifier */
285 int register_inet6addr_notifier(struct notifier_block *nb);
286 int unregister_inet6addr_notifier(struct notifier_block *nb);
287 int inet6addr_notifier_call_chain(unsigned long val, void *v);
289 int register_inet6addr_validator_notifier(struct notifier_block *nb);
290 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
291 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
293 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
294 int ifindex, struct ipv6_devconf *devconf);
297 * __in6_dev_get - get inet6_dev pointer from netdevice
298 * @dev: network device
300 * Caller must hold rcu_read_lock or RTNL, because this function
301 * does not take a reference on the inet6_dev.
303 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
305 return rcu_dereference_rtnl(dev->ip6_ptr);
309 * in6_dev_get - get inet6_dev pointer from netdevice
310 * @dev: network device
312 * This version can be used in any context, and takes a reference
313 * on the inet6_dev. Callers must use in6_dev_put() later to
314 * release this reference.
316 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
318 struct inet6_dev *idev;
321 idev = rcu_dereference(dev->ip6_ptr);
323 refcount_inc(&idev->refcnt);
328 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
330 struct inet6_dev *idev = __in6_dev_get(dev);
332 return idev ? idev->nd_parms : NULL;
335 void in6_dev_finish_destroy(struct inet6_dev *idev);
337 static inline void in6_dev_put(struct inet6_dev *idev)
339 if (refcount_dec_and_test(&idev->refcnt))
340 in6_dev_finish_destroy(idev);
343 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
345 struct inet6_dev *idev = *pidev;
353 static inline void __in6_dev_put(struct inet6_dev *idev)
355 refcount_dec(&idev->refcnt);
358 static inline void in6_dev_hold(struct inet6_dev *idev)
360 refcount_inc(&idev->refcnt);
363 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
365 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
367 if (refcount_dec_and_test(&ifp->refcnt))
368 inet6_ifa_finish_destroy(ifp);
371 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
373 refcount_dec(&ifp->refcnt);
376 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
378 refcount_inc(&ifp->refcnt);
383 * compute link-local solicited-node multicast address
386 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
387 struct in6_addr *solicited)
389 ipv6_addr_set(solicited,
390 htonl(0xFF020000), 0,
392 htonl(0xFF000000) | addr->s6_addr32[3]);
395 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
397 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
398 __be64 *p = (__be64 *)addr;
399 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
401 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
402 addr->s6_addr32[1] | addr->s6_addr32[2] |
403 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
407 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
409 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
410 __be64 *p = (__be64 *)addr;
411 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
413 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
414 addr->s6_addr32[1] | addr->s6_addr32[2] |
415 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
419 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
421 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
424 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
426 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
427 __be64 *p = (__be64 *)addr;
428 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
429 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
430 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
432 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
434 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
435 (addr->s6_addr[12] ^ 0xff)) == 0;
439 #ifdef CONFIG_PROC_FS
440 int if6_proc_init(void);
441 void if6_proc_exit(void);