1 #ifndef _ADDRCONF_H
2 #define _ADDRCONF_H
3
4 #define MAX_RTR_SOLICITATIONS -1 /* unlimited */
5 #define RTR_SOLICITATION_INTERVAL (4*HZ)
6 #define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
7
8 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
9
10 #define TEMP_VALID_LIFETIME (7*86400)
11 #define TEMP_PREFERRED_LIFETIME (86400)
12 #define REGEN_MAX_RETRY (3)
13 #define MAX_DESYNC_FACTOR (600)
14
15 #define ADDR_CHECK_FREQUENCY (120*HZ)
16
17 #define IPV6_MAX_ADDRESSES 16
18
19 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
20 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
21 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
22
23 #define ADDRCONF_NOTIFY_PRIORITY 0
24
25 #include <linux/in.h>
26 #include <linux/in6.h>
27
28 struct prefix_info {
29 __u8 type;
30 __u8 length;
31 __u8 prefix_len;
32
33 #if defined(__BIG_ENDIAN_BITFIELD)
34 __u8 onlink : 1,
35 autoconf : 1,
36 reserved : 6;
37 #elif defined(__LITTLE_ENDIAN_BITFIELD)
38 __u8 reserved : 6,
39 autoconf : 1,
40 onlink : 1;
41 #else
42 #error "Please fix <asm/byteorder.h>"
43 #endif
44 __be32 valid;
45 __be32 prefered;
46 __be32 reserved2;
47
48 struct in6_addr prefix;
49 };
50
51
52 #include <linux/netdevice.h>
53 #include <net/if_inet6.h>
54 #include <net/ipv6.h>
55
56 #define IN6_ADDR_HSIZE_SHIFT 4
57 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
58
59 int addrconf_init(void);
60 void addrconf_cleanup(void);
61
62 int addrconf_add_ifaddr(struct net *net, void __user *arg);
63 int addrconf_del_ifaddr(struct net *net, void __user *arg);
64 int addrconf_set_dstaddr(struct net *net, void __user *arg);
65
66 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
67 const struct net_device *dev, int strict);
68 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
69 const struct net_device *dev, int strict,
70 u32 banned_flags);
71
72 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
73 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
74 #endif
75
76 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
77 const unsigned int prefix_len,
78 struct net_device *dev);
79
80 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
81
82 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
83 const struct in6_addr *addr,
84 struct net_device *dev, int strict);
85
86 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
87 const struct in6_addr *daddr, unsigned int srcprefs,
88 struct in6_addr *saddr);
89 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
90 u32 banned_flags);
91 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
92 u32 banned_flags);
93 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
94 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
95 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
96
addrconf_timeout_fixup(u32 timeout,unsigned int unit)97 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
98 unsigned int unit)
99 {
100 if (timeout == 0xffffffff)
101 return ~0UL;
102
103 /*
104 * Avoid arithmetic overflow.
105 * Assuming unit is constant and non-zero, this "if" statement
106 * will go away on 64bit archs.
107 */
108 if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
109 return LONG_MAX / unit;
110
111 return timeout;
112 }
113
addrconf_finite_timeout(unsigned long timeout)114 static inline int addrconf_finite_timeout(unsigned long timeout)
115 {
116 return ~timeout;
117 }
118
119 /*
120 * IPv6 Address Label subsystem (addrlabel.c)
121 */
122 int ipv6_addr_label_init(void);
123 void ipv6_addr_label_cleanup(void);
124 void ipv6_addr_label_rtnl_register(void);
125 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
126 int type, int ifindex);
127
128 /*
129 * multicast prototypes (mcast.c)
130 */
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
132 const struct in6_addr *addr);
133 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
134 const struct in6_addr *addr);
135 void ipv6_sock_mc_close(struct sock *sk);
136 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
137 const struct in6_addr *src_addr);
138
139 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
140 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
141 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
142 void ipv6_mc_up(struct inet6_dev *idev);
143 void ipv6_mc_down(struct inet6_dev *idev);
144 void ipv6_mc_unmap(struct inet6_dev *idev);
145 void ipv6_mc_remap(struct inet6_dev *idev);
146 void ipv6_mc_init_dev(struct inet6_dev *idev);
147 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
148 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
149
150 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
151 const struct in6_addr *src_addr);
152
153 void ipv6_mc_dad_complete(struct inet6_dev *idev);
154
155 /* A stub used by vxlan module. This is ugly, ideally these
156 * symbols should be built into the core kernel.
157 */
158 struct ipv6_stub {
159 int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
160 const struct in6_addr *addr);
161 int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
162 const struct in6_addr *addr);
163 int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
164 struct flowi6 *fl6);
165 void (*udpv6_encap_enable)(void);
166 void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
167 const struct in6_addr *daddr,
168 const struct in6_addr *solicited_addr,
169 bool router, bool solicited, bool override, bool inc_opt);
170 struct neigh_table *nd_tbl;
171 };
172 extern const struct ipv6_stub *ipv6_stub __read_mostly;
173
174 /*
175 * identify MLD packets for MLD filter exceptions
176 */
ipv6_is_mld(struct sk_buff * skb,int nexthdr,int offset)177 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
178 {
179 struct icmp6hdr *hdr;
180
181 if (nexthdr != IPPROTO_ICMPV6 ||
182 !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
183 return false;
184
185 hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
186
187 switch (hdr->icmp6_type) {
188 case ICMPV6_MGM_QUERY:
189 case ICMPV6_MGM_REPORT:
190 case ICMPV6_MGM_REDUCTION:
191 case ICMPV6_MLD2_REPORT:
192 return true;
193 default:
194 break;
195 }
196 return false;
197 }
198
199 void addrconf_prefix_rcv(struct net_device *dev,
200 u8 *opt, int len, bool sllao);
201
202 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table);
203
204 /*
205 * anycast prototypes (anycast.c)
206 */
207 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
208 const struct in6_addr *addr);
209 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
210 const struct in6_addr *addr);
211 void ipv6_sock_ac_close(struct sock *sk);
212
213 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
214 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
215 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
216 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
217 const struct in6_addr *addr);
218 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
219 const struct in6_addr *addr);
220
221 /* Device notifier */
222 int register_inet6addr_notifier(struct notifier_block *nb);
223 int unregister_inet6addr_notifier(struct notifier_block *nb);
224 int inet6addr_notifier_call_chain(unsigned long val, void *v);
225
226 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
227 struct ipv6_devconf *devconf);
228
229 /**
230 * __in6_dev_get - get inet6_dev pointer from netdevice
231 * @dev: network device
232 *
233 * Caller must hold rcu_read_lock or RTNL, because this function
234 * does not take a reference on the inet6_dev.
235 */
__in6_dev_get(const struct net_device * dev)236 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
237 {
238 return rcu_dereference_rtnl(dev->ip6_ptr);
239 }
240
241 /**
242 * in6_dev_get - get inet6_dev pointer from netdevice
243 * @dev: network device
244 *
245 * This version can be used in any context, and takes a reference
246 * on the inet6_dev. Callers must use in6_dev_put() later to
247 * release this reference.
248 */
in6_dev_get(const struct net_device * dev)249 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
250 {
251 struct inet6_dev *idev;
252
253 rcu_read_lock();
254 idev = rcu_dereference(dev->ip6_ptr);
255 if (idev)
256 atomic_inc(&idev->refcnt);
257 rcu_read_unlock();
258 return idev;
259 }
260
__in6_dev_nd_parms_get_rcu(const struct net_device * dev)261 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
262 {
263 struct inet6_dev *idev = __in6_dev_get(dev);
264
265 return idev ? idev->nd_parms : NULL;
266 }
267
268 void in6_dev_finish_destroy(struct inet6_dev *idev);
269
in6_dev_put(struct inet6_dev * idev)270 static inline void in6_dev_put(struct inet6_dev *idev)
271 {
272 if (atomic_dec_and_test(&idev->refcnt))
273 in6_dev_finish_destroy(idev);
274 }
275
__in6_dev_put(struct inet6_dev * idev)276 static inline void __in6_dev_put(struct inet6_dev *idev)
277 {
278 atomic_dec(&idev->refcnt);
279 }
280
in6_dev_hold(struct inet6_dev * idev)281 static inline void in6_dev_hold(struct inet6_dev *idev)
282 {
283 atomic_inc(&idev->refcnt);
284 }
285
286 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
287
in6_ifa_put(struct inet6_ifaddr * ifp)288 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
289 {
290 if (atomic_dec_and_test(&ifp->refcnt))
291 inet6_ifa_finish_destroy(ifp);
292 }
293
__in6_ifa_put(struct inet6_ifaddr * ifp)294 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
295 {
296 atomic_dec(&ifp->refcnt);
297 }
298
in6_ifa_hold(struct inet6_ifaddr * ifp)299 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
300 {
301 atomic_inc(&ifp->refcnt);
302 }
303
304
305 /*
306 * compute link-local solicited-node multicast address
307 */
308
addrconf_addr_solict_mult(const struct in6_addr * addr,struct in6_addr * solicited)309 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
310 struct in6_addr *solicited)
311 {
312 ipv6_addr_set(solicited,
313 htonl(0xFF020000), 0,
314 htonl(0x1),
315 htonl(0xFF000000) | addr->s6_addr32[3]);
316 }
317
ipv6_addr_is_ll_all_nodes(const struct in6_addr * addr)318 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
319 {
320 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
321 __be64 *p = (__be64 *)addr;
322 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
323 #else
324 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
325 addr->s6_addr32[1] | addr->s6_addr32[2] |
326 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
327 #endif
328 }
329
ipv6_addr_is_ll_all_routers(const struct in6_addr * addr)330 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
331 {
332 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
333 __be64 *p = (__be64 *)addr;
334 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
335 #else
336 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
337 addr->s6_addr32[1] | addr->s6_addr32[2] |
338 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
339 #endif
340 }
341
ipv6_addr_is_isatap(const struct in6_addr * addr)342 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
343 {
344 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
345 }
346
ipv6_addr_is_solict_mult(const struct in6_addr * addr)347 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
348 {
349 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
350 __be64 *p = (__be64 *)addr;
351 return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
352 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
353 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
354 #else
355 return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
356 addr->s6_addr32[1] |
357 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
358 (addr->s6_addr[12] ^ 0xff)) == 0;
359 #endif
360 }
361
362 #ifdef CONFIG_PROC_FS
363 int if6_proc_init(void);
364 void if6_proc_exit(void);
365 #endif
366
367 #endif
368