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addrconf.h
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1 #ifndef _ADDRCONF_H
2 #define _ADDRCONF_H
3 
4 #define MAX_RTR_SOLICITATIONS 3
5 #define RTR_SOLICITATION_INTERVAL (4*HZ)
6 
7 #define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
8 
9 #define TEMP_VALID_LIFETIME (7*86400)
10 #define TEMP_PREFERRED_LIFETIME (86400)
11 #define REGEN_MAX_RETRY (3)
12 #define MAX_DESYNC_FACTOR (600)
13 
14 #define ADDR_CHECK_FREQUENCY (120*HZ)
15 
16 #define IPV6_MAX_ADDRESSES 16
17 
18 #include <linux/in.h>
19 #include <linux/in6.h>
20 
21 struct prefix_info {
22  __u8 type;
23  __u8 length;
24  __u8 prefix_len;
25 
26 #if defined(__BIG_ENDIAN_BITFIELD)
27  __u8 onlink : 1,
28  autoconf : 1,
29  reserved : 6;
30 #elif defined(__LITTLE_ENDIAN_BITFIELD)
31  __u8 reserved : 6,
32  autoconf : 1,
33  onlink : 1;
34 #else
35 #error "Please fix <asm/byteorder.h>"
36 #endif
37  __be32 valid;
38  __be32 prefered;
39  __be32 reserved2;
40 
41  struct in6_addr prefix;
42 };
43 
44 
45 #include <linux/netdevice.h>
46 #include <net/if_inet6.h>
47 #include <net/ipv6.h>
48 
49 #define IN6_ADDR_HSIZE_SHIFT 4
50 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
51 
52 extern int addrconf_init(void);
53 extern void addrconf_cleanup(void);
54 
55 extern int addrconf_add_ifaddr(struct net *net,
56  void __user *arg);
57 extern int addrconf_del_ifaddr(struct net *net,
58  void __user *arg);
59 extern int addrconf_set_dstaddr(struct net *net,
60  void __user *arg);
61 
62 extern int ipv6_chk_addr(struct net *net,
63  const struct in6_addr *addr,
64  struct net_device *dev,
65  int strict);
66 
67 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
68 extern int ipv6_chk_home_addr(struct net *net,
69  const struct in6_addr *addr);
70 #endif
71 
72 extern int ipv6_chk_prefix(const struct in6_addr *addr,
73  struct net_device *dev);
74 
75 extern struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
76  const struct in6_addr *addr,
77  struct net_device *dev,
78  int strict);
79 
80 extern int ipv6_dev_get_saddr(struct net *net,
81  const struct net_device *dev,
82  const struct in6_addr *daddr,
83  unsigned int srcprefs,
84  struct in6_addr *saddr);
85 extern int ipv6_get_lladdr(struct net_device *dev,
86  struct in6_addr *addr,
87  unsigned char banned_flags);
88 extern int ipv6_rcv_saddr_equal(const struct sock *sk,
89  const struct sock *sk2);
90 extern void addrconf_join_solict(struct net_device *dev,
91  const struct in6_addr *addr);
92 extern void addrconf_leave_solict(struct inet6_dev *idev,
93  const struct in6_addr *addr);
94 
95 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
96  unsigned int unit)
97 {
98  if (timeout == 0xffffffff)
99  return ~0UL;
100 
101  /*
102  * Avoid arithmetic overflow.
103  * Assuming unit is constant and non-zero, this "if" statement
104  * will go away on 64bit archs.
105  */
106  if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
107  return LONG_MAX / unit;
108 
109  return timeout;
110 }
111 
112 static inline int addrconf_finite_timeout(unsigned long timeout)
113 {
114  return ~timeout;
115 }
116 
117 /*
118  * IPv6 Address Label subsystem (addrlabel.c)
119  */
120 extern int ipv6_addr_label_init(void);
121 extern void ipv6_addr_label_cleanup(void);
122 extern void ipv6_addr_label_rtnl_register(void);
123 extern u32 ipv6_addr_label(struct net *net,
124  const struct in6_addr *addr,
125  int type, int ifindex);
126 
127 /*
128  * multicast prototypes (mcast.c)
129  */
130 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
131  const struct in6_addr *addr);
132 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
133  const struct in6_addr *addr);
134 extern void ipv6_sock_mc_close(struct sock *sk);
135 extern bool inet6_mc_check(struct sock *sk,
136  const struct in6_addr *mc_addr,
137  const struct in6_addr *src_addr);
138 
139 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
140 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
141 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
142 extern void ipv6_mc_up(struct inet6_dev *idev);
143 extern void ipv6_mc_down(struct inet6_dev *idev);
144 extern void ipv6_mc_unmap(struct inet6_dev *idev);
145 extern void ipv6_mc_remap(struct inet6_dev *idev);
146 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
147 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
148 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
149 
150 extern bool ipv6_chk_mcast_addr(struct net_device *dev,
151  const struct in6_addr *group,
152  const struct in6_addr *src_addr);
153 extern bool ipv6_is_mld(struct sk_buff *skb, int nexthdr);
154 
155 extern void addrconf_prefix_rcv(struct net_device *dev,
156  u8 *opt, int len, bool sllao);
157 
158 /*
159  * anycast prototypes (anycast.c)
160  */
161 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
162 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
163 extern void ipv6_sock_ac_close(struct sock *sk);
164 
165 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
166 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
167 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
168  const struct in6_addr *addr);
169 
170 
171 /* Device notifier */
172 extern int register_inet6addr_notifier(struct notifier_block *nb);
173 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
174 
182 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
183 {
184  return rcu_dereference_rtnl(dev->ip6_ptr);
185 }
186 
195 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
196 {
197  struct inet6_dev *idev;
198 
199  rcu_read_lock();
200  idev = rcu_dereference(dev->ip6_ptr);
201  if (idev)
202  atomic_inc(&idev->refcnt);
203  rcu_read_unlock();
204  return idev;
205 }
206 
207 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
208 
209 static inline void in6_dev_put(struct inet6_dev *idev)
210 {
211  if (atomic_dec_and_test(&idev->refcnt))
212  in6_dev_finish_destroy(idev);
213 }
214 
215 static inline void __in6_dev_put(struct inet6_dev *idev)
216 {
217  atomic_dec(&idev->refcnt);
218 }
219 
220 static inline void in6_dev_hold(struct inet6_dev *idev)
221 {
222  atomic_inc(&idev->refcnt);
223 }
224 
225 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
226 
227 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
228 {
229  if (atomic_dec_and_test(&ifp->refcnt))
230  inet6_ifa_finish_destroy(ifp);
231 }
232 
233 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
234 {
235  atomic_dec(&ifp->refcnt);
236 }
237 
238 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
239 {
240  atomic_inc(&ifp->refcnt);
241 }
242 
243 
244 /*
245  * compute link-local solicited-node multicast address
246  */
247 
248 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
249  struct in6_addr *solicited)
250 {
251  ipv6_addr_set(solicited,
252  htonl(0xFF020000), 0,
253  htonl(0x1),
254  htonl(0xFF000000) | addr->s6_addr32[3]);
255 }
256 
257 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
258 {
259  return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
260 }
261 
262 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
263 {
264  return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
265  addr->s6_addr32[1] | addr->s6_addr32[2] |
266  (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
267 }
268 
269 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
270 {
271  return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
272  addr->s6_addr32[1] | addr->s6_addr32[2] |
273  (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
274 }
275 
276 static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
277 {
278  return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
279 }
280 
281 #ifdef CONFIG_PROC_FS
282 extern int if6_proc_init(void);
283 extern void if6_proc_exit(void);
284 #endif
285 
286 #endif
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