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;
62 int addrconf_init(void);
63 void addrconf_cleanup(void);
65 int addrconf_add_ifaddr(struct net *net, void __user *arg);
66 int addrconf_del_ifaddr(struct net *net, void __user *arg);
67 int addrconf_set_dstaddr(struct net *net, void __user *arg);
69 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
70 const struct net_device *dev, int strict);
71 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
72 const struct net_device *dev, bool skip_dev_check,
73 int strict, u32 banned_flags);
75 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
76 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
79 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
80 const unsigned int prefix_len,
81 struct net_device *dev);
83 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
85 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
86 const struct in6_addr *addr,
87 struct net_device *dev, int strict);
89 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
90 const struct in6_addr *daddr, unsigned int srcprefs,
91 struct in6_addr *saddr);
92 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
94 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
96 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
98 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
99 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
101 void addrconf_add_linklocal(struct inet6_dev *idev,
102 const struct in6_addr *addr, u32 flags);
104 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
105 const struct prefix_info *pinfo,
106 struct inet6_dev *in6_dev,
107 const struct in6_addr *addr, int addr_type,
108 u32 addr_flags, bool sllao, bool tokenized,
109 __u32 valid_lft, u32 prefered_lft);
111 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
113 memcpy(eui, addr, 3);
116 memcpy(eui + 5, addr + 3, 3);
119 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
121 addrconf_addr_eui48_base(eui, addr);
125 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
127 if (dev->addr_len != ETH_ALEN)
131 * The zSeries OSA network cards can be shared among various
132 * OS instances, but the OSA cards have only one MAC address.
133 * This leads to duplicate address conflicts in conjunction
134 * with IPv6 if more than one instance uses the same card.
136 * The driver for these cards can deliver a unique 16-bit
137 * identifier for each instance sharing the same card. It is
138 * placed instead of 0xFFFE in the interface identifier. The
139 * "u" bit of the interface identifier is not inverted in this
140 * case. Hence the resulting interface identifier has local
141 * scope according to RFC2373.
144 addrconf_addr_eui48_base(eui, dev->dev_addr);
147 eui[3] = (dev->dev_id >> 8) & 0xFF;
148 eui[4] = dev->dev_id & 0xFF;
156 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
159 if (timeout == 0xffffffff)
163 * Avoid arithmetic overflow.
164 * Assuming unit is constant and non-zero, this "if" statement
165 * will go away on 64bit archs.
167 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
168 return LONG_MAX / unit;
173 static inline int addrconf_finite_timeout(unsigned long timeout)
179 * IPv6 Address Label subsystem (addrlabel.c)
181 int ipv6_addr_label_init(void);
182 void ipv6_addr_label_cleanup(void);
183 int ipv6_addr_label_rtnl_register(void);
184 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
185 int type, int ifindex);
188 * multicast prototypes (mcast.c)
190 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
191 const struct in6_addr *addr);
192 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
193 const struct in6_addr *addr);
194 void __ipv6_sock_mc_close(struct sock *sk);
195 void ipv6_sock_mc_close(struct sock *sk);
196 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
197 const struct in6_addr *src_addr);
199 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
200 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
201 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
202 void ipv6_mc_up(struct inet6_dev *idev);
203 void ipv6_mc_down(struct inet6_dev *idev);
204 void ipv6_mc_unmap(struct inet6_dev *idev);
205 void ipv6_mc_remap(struct inet6_dev *idev);
206 void ipv6_mc_init_dev(struct inet6_dev *idev);
207 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
208 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
209 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
211 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
212 const struct in6_addr *src_addr);
214 void ipv6_mc_dad_complete(struct inet6_dev *idev);
216 /* A stub used by vxlan module. This is ugly, ideally these
217 * symbols should be built into the core kernel.
220 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
221 const struct in6_addr *addr);
222 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
223 const struct in6_addr *addr);
224 int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
225 struct dst_entry **dst, struct flowi6 *fl6);
226 void (*udpv6_encap_enable)(void);
227 void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
228 const struct in6_addr *solicited_addr,
229 bool router, bool solicited, bool override, bool inc_opt);
230 struct neigh_table *nd_tbl;
232 extern const struct ipv6_stub *ipv6_stub __read_mostly;
234 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
235 struct ipv6_bpf_stub {
236 int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
237 bool force_bind_address_no_port, bool with_lock);
239 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
242 * identify MLD packets for MLD filter exceptions
244 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
246 struct icmp6hdr *hdr;
248 if (nexthdr != IPPROTO_ICMPV6 ||
249 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
252 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
254 switch (hdr->icmp6_type) {
255 case ICMPV6_MGM_QUERY:
256 case ICMPV6_MGM_REPORT:
257 case ICMPV6_MGM_REDUCTION:
258 case ICMPV6_MLD2_REPORT:
266 void addrconf_prefix_rcv(struct net_device *dev,
267 u8 *opt, int len, bool sllao);
270 * anycast prototypes (anycast.c)
272 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
273 const struct in6_addr *addr);
274 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
275 const struct in6_addr *addr);
276 void ipv6_sock_ac_close(struct sock *sk);
278 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
279 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
280 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
281 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
282 const struct in6_addr *addr);
283 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
284 const struct in6_addr *addr);
286 /* Device notifier */
287 int register_inet6addr_notifier(struct notifier_block *nb);
288 int unregister_inet6addr_notifier(struct notifier_block *nb);
289 int inet6addr_notifier_call_chain(unsigned long val, void *v);
291 int register_inet6addr_validator_notifier(struct notifier_block *nb);
292 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
293 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
295 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
296 int ifindex, struct ipv6_devconf *devconf);
299 * __in6_dev_get - get inet6_dev pointer from netdevice
300 * @dev: network device
302 * Caller must hold rcu_read_lock or RTNL, because this function
303 * does not take a reference on the inet6_dev.
305 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
307 return rcu_dereference_rtnl(dev->ip6_ptr);
311 * in6_dev_get - get inet6_dev pointer from netdevice
312 * @dev: network device
314 * This version can be used in any context, and takes a reference
315 * on the inet6_dev. Callers must use in6_dev_put() later to
316 * release this reference.
318 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
320 struct inet6_dev *idev;
323 idev = rcu_dereference(dev->ip6_ptr);
325 refcount_inc(&idev->refcnt);
330 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
332 struct inet6_dev *idev = __in6_dev_get(dev);
334 return idev ? idev->nd_parms : NULL;
337 void in6_dev_finish_destroy(struct inet6_dev *idev);
339 static inline void in6_dev_put(struct inet6_dev *idev)
341 if (refcount_dec_and_test(&idev->refcnt))
342 in6_dev_finish_destroy(idev);
345 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
347 struct inet6_dev *idev = *pidev;
355 static inline void __in6_dev_put(struct inet6_dev *idev)
357 refcount_dec(&idev->refcnt);
360 static inline void in6_dev_hold(struct inet6_dev *idev)
362 refcount_inc(&idev->refcnt);
365 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
367 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
369 if (refcount_dec_and_test(&ifp->refcnt))
370 inet6_ifa_finish_destroy(ifp);
373 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
375 refcount_dec(&ifp->refcnt);
378 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
380 refcount_inc(&ifp->refcnt);
385 * compute link-local solicited-node multicast address
388 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
389 struct in6_addr *solicited)
391 ipv6_addr_set(solicited,
392 htonl(0xFF020000), 0,
394 htonl(0xFF000000) | addr->s6_addr32[3]);
397 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
399 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
400 __be64 *p = (__be64 *)addr;
401 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
403 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
404 addr->s6_addr32[1] | addr->s6_addr32[2] |
405 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
409 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
411 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
412 __be64 *p = (__be64 *)addr;
413 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
415 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
416 addr->s6_addr32[1] | addr->s6_addr32[2] |
417 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
421 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
423 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
426 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
428 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
429 __be64 *p = (__be64 *)addr;
430 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
431 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
432 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
434 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
436 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
437 (addr->s6_addr[12] ^ 0xff)) == 0;
441 #ifdef CONFIG_PROC_FS
442 int if6_proc_init(void);
443 void if6_proc_exit(void);