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 struct dst_entry *(*ipv6_dst_lookup_flow)(struct net *net,
239 const struct sock *sk,
241 const struct in6_addr *final_dst);
243 struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
244 struct fib6_info *(*fib6_lookup)(struct net *net, int oif,
245 struct flowi6 *fl6, int flags);
246 struct fib6_info *(*fib6_table_lookup)(struct net *net,
247 struct fib6_table *table,
248 int oif, struct flowi6 *fl6,
250 struct fib6_info *(*fib6_multipath_select)(const struct net *net,
251 struct fib6_info *f6i,
252 struct flowi6 *fl6, int oif,
253 const struct sk_buff *skb,
255 u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
256 struct in6_addr *saddr);
258 void (*udpv6_encap_enable)(void);
259 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
260 const struct in6_addr *solicited_addr,
261 bool router, bool solicited, bool override, bool inc_opt);
262 struct neigh_table *nd_tbl;
264 extern const struct ipv6_stub *ipv6_stub __read_mostly;
266 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
267 struct ipv6_bpf_stub {
268 int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
269 bool force_bind_address_no_port, bool with_lock);
271 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
274 * identify MLD packets for MLD filter exceptions
276 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
278 struct icmp6hdr *hdr;
280 if (nexthdr != IPPROTO_ICMPV6 ||
281 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
284 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
286 switch (hdr->icmp6_type) {
287 case ICMPV6_MGM_QUERY:
288 case ICMPV6_MGM_REPORT:
289 case ICMPV6_MGM_REDUCTION:
290 case ICMPV6_MLD2_REPORT:
298 void addrconf_prefix_rcv(struct net_device *dev,
299 u8 *opt, int len, bool sllao);
302 * anycast prototypes (anycast.c)
304 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
305 const struct in6_addr *addr);
306 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
307 const struct in6_addr *addr);
308 void __ipv6_sock_ac_close(struct sock *sk);
309 void ipv6_sock_ac_close(struct sock *sk);
311 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
312 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
313 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
314 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
315 const struct in6_addr *addr);
316 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
317 const struct in6_addr *addr);
319 /* Device notifier */
320 int register_inet6addr_notifier(struct notifier_block *nb);
321 int unregister_inet6addr_notifier(struct notifier_block *nb);
322 int inet6addr_notifier_call_chain(unsigned long val, void *v);
324 int register_inet6addr_validator_notifier(struct notifier_block *nb);
325 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
326 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
328 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
329 int ifindex, struct ipv6_devconf *devconf);
332 * __in6_dev_get - get inet6_dev pointer from netdevice
333 * @dev: network device
335 * Caller must hold rcu_read_lock or RTNL, because this function
336 * does not take a reference on the inet6_dev.
338 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
340 return rcu_dereference_rtnl(dev->ip6_ptr);
344 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
345 * @dev: network device
347 * This is a safer version of __in6_dev_get
349 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
352 return rcu_dereference_rtnl(dev->ip6_ptr);
358 * in6_dev_get - get inet6_dev pointer from netdevice
359 * @dev: network device
361 * This version can be used in any context, and takes a reference
362 * on the inet6_dev. Callers must use in6_dev_put() later to
363 * release this reference.
365 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
367 struct inet6_dev *idev;
370 idev = rcu_dereference(dev->ip6_ptr);
372 refcount_inc(&idev->refcnt);
377 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
379 struct inet6_dev *idev = __in6_dev_get(dev);
381 return idev ? idev->nd_parms : NULL;
384 void in6_dev_finish_destroy(struct inet6_dev *idev);
386 static inline void in6_dev_put(struct inet6_dev *idev)
388 if (refcount_dec_and_test(&idev->refcnt))
389 in6_dev_finish_destroy(idev);
392 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
394 struct inet6_dev *idev = *pidev;
402 static inline void __in6_dev_put(struct inet6_dev *idev)
404 refcount_dec(&idev->refcnt);
407 static inline void in6_dev_hold(struct inet6_dev *idev)
409 refcount_inc(&idev->refcnt);
412 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
414 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
416 if (refcount_dec_and_test(&ifp->refcnt))
417 inet6_ifa_finish_destroy(ifp);
420 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
422 refcount_dec(&ifp->refcnt);
425 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
427 refcount_inc(&ifp->refcnt);
432 * compute link-local solicited-node multicast address
435 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
436 struct in6_addr *solicited)
438 ipv6_addr_set(solicited,
439 htonl(0xFF020000), 0,
441 htonl(0xFF000000) | addr->s6_addr32[3]);
444 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
446 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
447 __be64 *p = (__be64 *)addr;
448 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
450 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
451 addr->s6_addr32[1] | addr->s6_addr32[2] |
452 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
456 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
458 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
459 __be64 *p = (__be64 *)addr;
460 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
462 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
463 addr->s6_addr32[1] | addr->s6_addr32[2] |
464 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
468 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
470 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
473 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
475 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
476 __be64 *p = (__be64 *)addr;
477 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
478 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
479 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
481 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
483 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
484 (addr->s6_addr[12] ^ 0xff)) == 0;
488 #ifdef CONFIG_PROC_FS
489 int if6_proc_init(void);
490 void if6_proc_exit(void);