net: Add checking to rcu_dereference() primitives
[linux-2.6.git] / include / net / addrconf.h
1 #ifndef _ADDRCONF_H
2 #define _ADDRCONF_H
3
4 #define RETRANS_TIMER   HZ
5
6 #define MAX_RTR_SOLICITATIONS           3
7 #define RTR_SOLICITATION_INTERVAL       (4*HZ)
8
9 #define MIN_VALID_LIFETIME              (2*3600)        /* 2 hours */
10
11 #define TEMP_VALID_LIFETIME             (7*86400)
12 #define TEMP_PREFERRED_LIFETIME         (86400)
13 #define REGEN_MAX_RETRY                 (5)
14 #define MAX_DESYNC_FACTOR               (600)
15
16 #define ADDR_CHECK_FREQUENCY            (120*HZ)
17
18 #define IPV6_MAX_ADDRESSES              16
19
20 #include <linux/in.h>
21 #include <linux/in6.h>
22
23 struct prefix_info {
24         __u8                    type;
25         __u8                    length;
26         __u8                    prefix_len;
27
28 #if defined(__BIG_ENDIAN_BITFIELD)
29         __u8                    onlink : 1,
30                                 autoconf : 1,
31                                 reserved : 6;
32 #elif defined(__LITTLE_ENDIAN_BITFIELD)
33         __u8                    reserved : 6,
34                                 autoconf : 1,
35                                 onlink : 1;
36 #else
37 #error "Please fix <asm/byteorder.h>"
38 #endif
39         __be32                  valid;
40         __be32                  prefered;
41         __be32                  reserved2;
42
43         struct in6_addr         prefix;
44 };
45
46
47 #ifdef __KERNEL__
48
49 #include <linux/netdevice.h>
50 #include <net/if_inet6.h>
51 #include <net/ipv6.h>
52
53 #define IN6_ADDR_HSIZE          16
54
55 extern int                      addrconf_init(void);
56 extern void                     addrconf_cleanup(void);
57
58 extern int                      addrconf_add_ifaddr(struct net *net,
59                                                     void __user *arg);
60 extern int                      addrconf_del_ifaddr(struct net *net,
61                                                     void __user *arg);
62 extern int                      addrconf_set_dstaddr(struct net *net,
63                                                      void __user *arg);
64
65 extern int                      ipv6_chk_addr(struct net *net,
66                                               struct in6_addr *addr,
67                                               struct net_device *dev,
68                                               int strict);
69
70 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
71 extern int                      ipv6_chk_home_addr(struct net *net,
72                                                    struct in6_addr *addr);
73 #endif
74
75 extern int                      ipv6_chk_prefix(struct in6_addr *addr,
76                                                 struct net_device *dev);
77
78 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
79                                                  const struct in6_addr *addr,
80                                                  struct net_device *dev,
81                                                  int strict);
82
83 extern int                      ipv6_dev_get_saddr(struct net *net,
84                                                struct net_device *dev,
85                                                const struct in6_addr *daddr,
86                                                unsigned int srcprefs,
87                                                struct in6_addr *saddr);
88 extern int                      ipv6_get_lladdr(struct net_device *dev,
89                                                 struct in6_addr *addr,
90                                                 unsigned char banned_flags);
91 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
92                                                     const struct sock *sk2);
93 extern void                     addrconf_join_solict(struct net_device *dev,
94                                         struct in6_addr *addr);
95 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
96                                         struct in6_addr *addr);
97
98 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
99                                                     unsigned unit)
100 {
101         if (timeout == 0xffffffff)
102                 return ~0UL;
103
104         /*
105          * Avoid arithmetic overflow.
106          * Assuming unit is constant and non-zero, this "if" statement
107          * will go away on 64bit archs.
108          */
109         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
110                 return LONG_MAX / unit;
111
112         return timeout;
113 }
114
115 static inline int addrconf_finite_timeout(unsigned long timeout)
116 {
117         return ~timeout;
118 }
119
120 /*
121  *      IPv6 Address Label subsystem (addrlabel.c)
122  */
123 extern int                      ipv6_addr_label_init(void);
124 extern void                     ipv6_addr_label_rtnl_register(void);
125 extern u32                      ipv6_addr_label(struct net *net,
126                                                 const struct in6_addr *addr,
127                                                 int type, int ifindex);
128
129 /*
130  *      multicast prototypes (mcast.c)
131  */
132 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
133                              const struct in6_addr *addr);
134 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
135                              const struct in6_addr *addr);
136 extern void ipv6_sock_mc_close(struct sock *sk);
137 extern int inet6_mc_check(struct sock *sk,
138                           const struct in6_addr *mc_addr,
139                           const struct in6_addr *src_addr);
140
141 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
142 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
143 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
144 extern void ipv6_mc_up(struct inet6_dev *idev);
145 extern void ipv6_mc_down(struct inet6_dev *idev);
146 extern void ipv6_mc_unmap(struct inet6_dev *idev);
147 extern void ipv6_mc_remap(struct inet6_dev *idev);
148 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
149 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
150 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
151
152 extern int ipv6_chk_mcast_addr(struct net_device *dev,
153                                const struct in6_addr *group,
154                                const struct in6_addr *src_addr);
155 extern int ipv6_is_mld(struct sk_buff *skb, int nexthdr);
156
157 extern void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len);
158
159 /*
160  *      anycast prototypes (anycast.c)
161  */
162 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex,struct in6_addr *addr);
163 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex,struct in6_addr *addr);
164 extern void ipv6_sock_ac_close(struct sock *sk);
165 extern int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex);
166
167 extern int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr);
168 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr);
169 extern int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
170                                struct in6_addr *addr);
171
172
173 /* Device notifier */
174 extern int register_inet6addr_notifier(struct notifier_block *nb);
175 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
176
177 static inline struct inet6_dev *
178 __in6_dev_get(struct net_device *dev)
179 {
180         return rcu_dereference_check(dev->ip6_ptr,
181                                      rcu_read_lock_held() ||
182                                      lockdep_rtnl_is_held());
183 }
184
185 static inline struct inet6_dev *
186 in6_dev_get(struct net_device *dev)
187 {
188         struct inet6_dev *idev = NULL;
189         rcu_read_lock();
190         idev = __in6_dev_get(dev);
191         if (idev)
192                 atomic_inc(&idev->refcnt);
193         rcu_read_unlock();
194         return idev;
195 }
196
197 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
198
199 static inline void
200 in6_dev_put(struct inet6_dev *idev)
201 {
202         if (atomic_dec_and_test(&idev->refcnt))
203                 in6_dev_finish_destroy(idev);
204 }
205
206 #define __in6_dev_put(idev)  atomic_dec(&(idev)->refcnt)
207 #define in6_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
208
209
210 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
211
212 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
213 {
214         if (atomic_dec_and_test(&ifp->refcnt))
215                 inet6_ifa_finish_destroy(ifp);
216 }
217
218 #define __in6_ifa_put(ifp)      atomic_dec(&(ifp)->refcnt)
219 #define in6_ifa_hold(ifp)       atomic_inc(&(ifp)->refcnt)
220
221
222
223 /*
224  *      compute link-local solicited-node multicast address
225  */
226
227 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
228                                              struct in6_addr *solicited)
229 {
230         ipv6_addr_set(solicited,
231                       htonl(0xFF020000), 0,
232                       htonl(0x1),
233                       htonl(0xFF000000) | addr->s6_addr32[3]);
234 }
235
236 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
237 {
238         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
239 }
240
241 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
242 {
243         return (((addr->s6_addr32[0] ^ htonl(0xff020000)) |
244                 addr->s6_addr32[1] | addr->s6_addr32[2] |
245                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0);
246 }
247
248 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
249 {
250         return (((addr->s6_addr32[0] ^ htonl(0xff020000)) |
251                 addr->s6_addr32[1] | addr->s6_addr32[2] |
252                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0);
253 }
254
255 extern int __ipv6_isatap_ifid(u8 *eui, __be32 addr);
256
257 static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
258 {
259         return ((addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE));
260 }
261
262 #ifdef CONFIG_PROC_FS
263 extern int if6_proc_init(void);
264 extern void if6_proc_exit(void);
265 #endif
266
267 #endif
268 #endif