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;
59 struct netlink_ext_ack *extack;
63 const struct in6_addr *pfx;
66 const struct in6_addr *peer_pfx;
75 int addrconf_init(void);
76 void addrconf_cleanup(void);
78 int addrconf_add_ifaddr(struct net *net, void __user *arg);
79 int addrconf_del_ifaddr(struct net *net, void __user *arg);
80 int addrconf_set_dstaddr(struct net *net, void __user *arg);
82 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
83 const struct net_device *dev, int strict);
84 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
85 const struct net_device *dev, bool skip_dev_check,
86 int strict, u32 banned_flags);
88 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
89 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
92 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
93 const unsigned int prefix_len,
94 struct net_device *dev);
96 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
98 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
99 const struct in6_addr *addr,
100 struct net_device *dev, int strict);
102 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
103 const struct in6_addr *daddr, unsigned int srcprefs,
104 struct in6_addr *saddr);
105 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
107 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
109 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
110 bool match_wildcard);
111 bool inet_rcv_saddr_any(const struct sock *sk);
112 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
113 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
115 void addrconf_add_linklocal(struct inet6_dev *idev,
116 const struct in6_addr *addr, u32 flags);
118 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
119 const struct prefix_info *pinfo,
120 struct inet6_dev *in6_dev,
121 const struct in6_addr *addr, int addr_type,
122 u32 addr_flags, bool sllao, bool tokenized,
123 __u32 valid_lft, u32 prefered_lft);
125 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
127 memcpy(eui, addr, 3);
130 memcpy(eui + 5, addr + 3, 3);
133 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
135 addrconf_addr_eui48_base(eui, addr);
139 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
141 if (dev->addr_len != ETH_ALEN)
145 * The zSeries OSA network cards can be shared among various
146 * OS instances, but the OSA cards have only one MAC address.
147 * This leads to duplicate address conflicts in conjunction
148 * with IPv6 if more than one instance uses the same card.
150 * The driver for these cards can deliver a unique 16-bit
151 * identifier for each instance sharing the same card. It is
152 * placed instead of 0xFFFE in the interface identifier. The
153 * "u" bit of the interface identifier is not inverted in this
154 * case. Hence the resulting interface identifier has local
155 * scope according to RFC2373.
158 addrconf_addr_eui48_base(eui, dev->dev_addr);
161 eui[3] = (dev->dev_id >> 8) & 0xFF;
162 eui[4] = dev->dev_id & 0xFF;
170 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
173 if (timeout == 0xffffffff)
177 * Avoid arithmetic overflow.
178 * Assuming unit is constant and non-zero, this "if" statement
179 * will go away on 64bit archs.
181 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
182 return LONG_MAX / unit;
187 static inline int addrconf_finite_timeout(unsigned long timeout)
193 * IPv6 Address Label subsystem (addrlabel.c)
195 int ipv6_addr_label_init(void);
196 void ipv6_addr_label_cleanup(void);
197 int ipv6_addr_label_rtnl_register(void);
198 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
199 int type, int ifindex);
202 * multicast prototypes (mcast.c)
204 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
205 const struct in6_addr *addr);
206 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
207 const struct in6_addr *addr);
208 void __ipv6_sock_mc_close(struct sock *sk);
209 void ipv6_sock_mc_close(struct sock *sk);
210 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
211 const struct in6_addr *src_addr);
213 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
214 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
215 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
216 void ipv6_mc_up(struct inet6_dev *idev);
217 void ipv6_mc_down(struct inet6_dev *idev);
218 void ipv6_mc_unmap(struct inet6_dev *idev);
219 void ipv6_mc_remap(struct inet6_dev *idev);
220 void ipv6_mc_init_dev(struct inet6_dev *idev);
221 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
222 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
223 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
225 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
226 const struct in6_addr *src_addr);
228 void ipv6_mc_dad_complete(struct inet6_dev *idev);
230 /* A stub used by vxlan module. This is ugly, ideally these
231 * symbols should be built into the core kernel.
234 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
235 const struct in6_addr *addr);
236 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
237 const struct in6_addr *addr);
238 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
239 struct dst_entry **dst, struct flowi6 *fl6);
241 struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
242 struct fib6_info *(*fib6_lookup)(struct net *net, int oif,
243 struct flowi6 *fl6, int flags);
244 struct fib6_info *(*fib6_table_lookup)(struct net *net,
245 struct fib6_table *table,
246 int oif, struct flowi6 *fl6,
248 struct fib6_info *(*fib6_multipath_select)(const struct net *net,
249 struct fib6_info *f6i,
250 struct flowi6 *fl6, int oif,
251 const struct sk_buff *skb,
253 u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
254 struct in6_addr *saddr);
256 void (*udpv6_encap_enable)(void);
257 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
258 const struct in6_addr *solicited_addr,
259 bool router, bool solicited, bool override, bool inc_opt);
260 struct neigh_table *nd_tbl;
262 extern const struct ipv6_stub *ipv6_stub __read_mostly;
264 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
265 struct ipv6_bpf_stub {
266 int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
267 bool force_bind_address_no_port, bool with_lock);
268 struct sock *(*udp6_lib_lookup)(struct net *net,
269 const struct in6_addr *saddr, __be16 sport,
270 const struct in6_addr *daddr, __be16 dport,
271 int dif, int sdif, struct udp_table *tbl,
272 struct sk_buff *skb);
274 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
277 * identify MLD packets for MLD filter exceptions
279 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
281 struct icmp6hdr *hdr;
283 if (nexthdr != IPPROTO_ICMPV6 ||
284 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
287 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
289 switch (hdr->icmp6_type) {
290 case ICMPV6_MGM_QUERY:
291 case ICMPV6_MGM_REPORT:
292 case ICMPV6_MGM_REDUCTION:
293 case ICMPV6_MLD2_REPORT:
301 void addrconf_prefix_rcv(struct net_device *dev,
302 u8 *opt, int len, bool sllao);
305 * anycast prototypes (anycast.c)
307 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
308 const struct in6_addr *addr);
309 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
310 const struct in6_addr *addr);
311 void ipv6_sock_ac_close(struct sock *sk);
313 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
314 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
315 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
316 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
317 const struct in6_addr *addr);
318 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
319 const struct in6_addr *addr);
320 int ipv6_anycast_init(void);
321 void ipv6_anycast_cleanup(void);
323 /* Device notifier */
324 int register_inet6addr_notifier(struct notifier_block *nb);
325 int unregister_inet6addr_notifier(struct notifier_block *nb);
326 int inet6addr_notifier_call_chain(unsigned long val, void *v);
328 int register_inet6addr_validator_notifier(struct notifier_block *nb);
329 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
330 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
332 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
333 int ifindex, struct ipv6_devconf *devconf);
336 * __in6_dev_get - get inet6_dev pointer from netdevice
337 * @dev: network device
339 * Caller must hold rcu_read_lock or RTNL, because this function
340 * does not take a reference on the inet6_dev.
342 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
344 return rcu_dereference_rtnl(dev->ip6_ptr);
348 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
349 * @dev: network device
351 * This is a safer version of __in6_dev_get
353 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
356 return rcu_dereference_rtnl(dev->ip6_ptr);
362 * in6_dev_get - get inet6_dev pointer from netdevice
363 * @dev: network device
365 * This version can be used in any context, and takes a reference
366 * on the inet6_dev. Callers must use in6_dev_put() later to
367 * release this reference.
369 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
371 struct inet6_dev *idev;
374 idev = rcu_dereference(dev->ip6_ptr);
376 refcount_inc(&idev->refcnt);
381 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
383 struct inet6_dev *idev = __in6_dev_get(dev);
385 return idev ? idev->nd_parms : NULL;
388 void in6_dev_finish_destroy(struct inet6_dev *idev);
390 static inline void in6_dev_put(struct inet6_dev *idev)
392 if (refcount_dec_and_test(&idev->refcnt))
393 in6_dev_finish_destroy(idev);
396 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
398 struct inet6_dev *idev = *pidev;
406 static inline void __in6_dev_put(struct inet6_dev *idev)
408 refcount_dec(&idev->refcnt);
411 static inline void in6_dev_hold(struct inet6_dev *idev)
413 refcount_inc(&idev->refcnt);
416 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
418 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
420 if (refcount_dec_and_test(&ifp->refcnt))
421 inet6_ifa_finish_destroy(ifp);
424 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
426 refcount_dec(&ifp->refcnt);
429 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
431 refcount_inc(&ifp->refcnt);
436 * compute link-local solicited-node multicast address
439 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
440 struct in6_addr *solicited)
442 ipv6_addr_set(solicited,
443 htonl(0xFF020000), 0,
445 htonl(0xFF000000) | addr->s6_addr32[3]);
448 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
450 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
451 __be64 *p = (__be64 *)addr;
452 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
454 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
455 addr->s6_addr32[1] | addr->s6_addr32[2] |
456 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
460 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
462 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
463 __be64 *p = (__be64 *)addr;
464 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
466 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
467 addr->s6_addr32[1] | addr->s6_addr32[2] |
468 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
472 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
474 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
477 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
479 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
480 __be64 *p = (__be64 *)addr;
481 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
482 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
483 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
485 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
487 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
488 (addr->s6_addr[12] ^ 0xff)) == 0;
492 #ifdef CONFIG_PROC_FS
493 int if6_proc_init(void);
494 void if6_proc_exit(void);