Linux 4.16.11
[linux/fpc-iii.git] / include / net / addrconf.h
blobc4185a7b0e9029aea30da1a40649fa97de0fe0d6
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ADDRCONF_H
3 #define _ADDRCONF_H
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
26 #include <linux/in.h>
27 #include <linux/in6.h>
29 struct prefix_info {
30 __u8 type;
31 __u8 length;
32 __u8 prefix_len;
34 #if defined(__BIG_ENDIAN_BITFIELD)
35 __u8 onlink : 1,
36 autoconf : 1,
37 reserved : 6;
38 #elif defined(__LITTLE_ENDIAN_BITFIELD)
39 __u8 reserved : 6,
40 autoconf : 1,
41 onlink : 1;
42 #else
43 #error "Please fix <asm/byteorder.h>"
44 #endif
45 __be32 valid;
46 __be32 prefered;
47 __be32 reserved2;
49 struct in6_addr prefix;
52 #include <linux/netdevice.h>
53 #include <net/if_inet6.h>
54 #include <net/ipv6.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, int strict,
73 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);
77 #endif
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,
93 u32 banned_flags);
94 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
95 u32 banned_flags);
96 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
97 bool match_wildcard);
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);
114 eui[3] = 0xFF;
115 eui[4] = 0xFE;
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);
122 eui[0] ^= 2;
125 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
127 if (dev->addr_len != ETH_ALEN)
128 return -1;
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);
146 if (dev->dev_id) {
147 eui[3] = (dev->dev_id >> 8) & 0xFF;
148 eui[4] = dev->dev_id & 0xFF;
149 } else {
150 eui[0] ^= 2;
153 return 0;
156 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
157 unsigned int unit)
159 if (timeout == 0xffffffff)
160 return ~0UL;
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;
170 return timeout;
173 static inline int addrconf_finite_timeout(unsigned long timeout)
175 return ~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.
219 struct ipv6_stub {
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;
235 * identify MLD packets for MLD filter exceptions
237 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
239 struct icmp6hdr *hdr;
241 if (nexthdr != IPPROTO_ICMPV6 ||
242 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
243 return false;
245 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
247 switch (hdr->icmp6_type) {
248 case ICMPV6_MGM_QUERY:
249 case ICMPV6_MGM_REPORT:
250 case ICMPV6_MGM_REDUCTION:
251 case ICMPV6_MLD2_REPORT:
252 return true;
253 default:
254 break;
256 return false;
259 void addrconf_prefix_rcv(struct net_device *dev,
260 u8 *opt, int len, bool sllao);
263 * anycast prototypes (anycast.c)
265 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
266 const struct in6_addr *addr);
267 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
268 const struct in6_addr *addr);
269 void ipv6_sock_ac_close(struct sock *sk);
271 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
272 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
273 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
274 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
275 const struct in6_addr *addr);
276 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
277 const struct in6_addr *addr);
279 /* Device notifier */
280 int register_inet6addr_notifier(struct notifier_block *nb);
281 int unregister_inet6addr_notifier(struct notifier_block *nb);
282 int inet6addr_notifier_call_chain(unsigned long val, void *v);
284 int register_inet6addr_validator_notifier(struct notifier_block *nb);
285 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
286 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
288 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
289 int ifindex, struct ipv6_devconf *devconf);
292 * __in6_dev_get - get inet6_dev pointer from netdevice
293 * @dev: network device
295 * Caller must hold rcu_read_lock or RTNL, because this function
296 * does not take a reference on the inet6_dev.
298 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
300 return rcu_dereference_rtnl(dev->ip6_ptr);
304 * in6_dev_get - get inet6_dev pointer from netdevice
305 * @dev: network device
307 * This version can be used in any context, and takes a reference
308 * on the inet6_dev. Callers must use in6_dev_put() later to
309 * release this reference.
311 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
313 struct inet6_dev *idev;
315 rcu_read_lock();
316 idev = rcu_dereference(dev->ip6_ptr);
317 if (idev)
318 refcount_inc(&idev->refcnt);
319 rcu_read_unlock();
320 return idev;
323 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
325 struct inet6_dev *idev = __in6_dev_get(dev);
327 return idev ? idev->nd_parms : NULL;
330 void in6_dev_finish_destroy(struct inet6_dev *idev);
332 static inline void in6_dev_put(struct inet6_dev *idev)
334 if (refcount_dec_and_test(&idev->refcnt))
335 in6_dev_finish_destroy(idev);
338 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
340 struct inet6_dev *idev = *pidev;
342 if (idev) {
343 in6_dev_put(idev);
344 *pidev = NULL;
348 static inline void __in6_dev_put(struct inet6_dev *idev)
350 refcount_dec(&idev->refcnt);
353 static inline void in6_dev_hold(struct inet6_dev *idev)
355 refcount_inc(&idev->refcnt);
358 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
360 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
362 if (refcount_dec_and_test(&ifp->refcnt))
363 inet6_ifa_finish_destroy(ifp);
366 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
368 refcount_dec(&ifp->refcnt);
371 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
373 refcount_inc(&ifp->refcnt);
378 * compute link-local solicited-node multicast address
381 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
382 struct in6_addr *solicited)
384 ipv6_addr_set(solicited,
385 htonl(0xFF020000), 0,
386 htonl(0x1),
387 htonl(0xFF000000) | addr->s6_addr32[3]);
390 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
392 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
393 __be64 *p = (__be64 *)addr;
394 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
395 #else
396 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
397 addr->s6_addr32[1] | addr->s6_addr32[2] |
398 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
399 #endif
402 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
404 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
405 __be64 *p = (__be64 *)addr;
406 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
407 #else
408 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
409 addr->s6_addr32[1] | addr->s6_addr32[2] |
410 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
411 #endif
414 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
416 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
419 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
421 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
422 __be64 *p = (__be64 *)addr;
423 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
424 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
425 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
426 #else
427 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
428 addr->s6_addr32[1] |
429 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
430 (addr->s6_addr[12] ^ 0xff)) == 0;
431 #endif
434 #ifdef CONFIG_PROC_FS
435 int if6_proc_init(void);
436 void if6_proc_exit(void);
437 #endif
439 #endif