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[~andy/linux] / include / net / addrconf.h
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 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
19 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
20 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
21
22 #include <linux/in.h>
23 #include <linux/in6.h>
24
25 struct prefix_info {
26         __u8                    type;
27         __u8                    length;
28         __u8                    prefix_len;
29
30 #if defined(__BIG_ENDIAN_BITFIELD)
31         __u8                    onlink : 1,
32                                 autoconf : 1,
33                                 reserved : 6;
34 #elif defined(__LITTLE_ENDIAN_BITFIELD)
35         __u8                    reserved : 6,
36                                 autoconf : 1,
37                                 onlink : 1;
38 #else
39 #error "Please fix <asm/byteorder.h>"
40 #endif
41         __be32                  valid;
42         __be32                  prefered;
43         __be32                  reserved2;
44
45         struct in6_addr         prefix;
46 };
47
48
49 #include <linux/netdevice.h>
50 #include <net/if_inet6.h>
51 #include <net/ipv6.h>
52
53 #define IN6_ADDR_HSIZE_SHIFT    4
54 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
55
56 extern int                      addrconf_init(void);
57 extern void                     addrconf_cleanup(void);
58
59 extern int                      addrconf_add_ifaddr(struct net *net,
60                                                     void __user *arg);
61 extern int                      addrconf_del_ifaddr(struct net *net,
62                                                     void __user *arg);
63 extern int                      addrconf_set_dstaddr(struct net *net,
64                                                      void __user *arg);
65
66 extern int                      ipv6_chk_addr(struct net *net,
67                                               const struct in6_addr *addr,
68                                               struct net_device *dev,
69                                               int strict);
70
71 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
72 extern int                      ipv6_chk_home_addr(struct net *net,
73                                                    const struct in6_addr *addr);
74 #endif
75
76 extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
77                                                 struct net_device *dev);
78
79 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
80                                                  const struct in6_addr *addr,
81                                                  struct net_device *dev,
82                                                  int strict);
83
84 extern int                      ipv6_dev_get_saddr(struct net *net,
85                                                const struct net_device *dev,
86                                                const struct in6_addr *daddr,
87                                                unsigned int srcprefs,
88                                                struct in6_addr *saddr);
89 extern int                      ipv6_get_lladdr(struct net_device *dev,
90                                                 struct in6_addr *addr,
91                                                 unsigned char banned_flags);
92 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
93                                                     const struct sock *sk2);
94 extern void                     addrconf_join_solict(struct net_device *dev,
95                                         const struct in6_addr *addr);
96 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
97                                         const struct in6_addr *addr);
98
99 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
100                                                    unsigned int unit)
101 {
102         if (timeout == 0xffffffff)
103                 return ~0UL;
104
105         /*
106          * Avoid arithmetic overflow.
107          * Assuming unit is constant and non-zero, this "if" statement
108          * will go away on 64bit archs.
109          */
110         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
111                 return LONG_MAX / unit;
112
113         return timeout;
114 }
115
116 static inline int addrconf_finite_timeout(unsigned long timeout)
117 {
118         return ~timeout;
119 }
120
121 /*
122  *      IPv6 Address Label subsystem (addrlabel.c)
123  */
124 extern int                      ipv6_addr_label_init(void);
125 extern void                     ipv6_addr_label_cleanup(void);
126 extern void                     ipv6_addr_label_rtnl_register(void);
127 extern u32                      ipv6_addr_label(struct net *net,
128                                                 const struct in6_addr *addr,
129                                                 int type, int ifindex);
130
131 /*
132  *      multicast prototypes (mcast.c)
133  */
134 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
135                              const struct in6_addr *addr);
136 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
137                              const struct in6_addr *addr);
138 extern void ipv6_sock_mc_close(struct sock *sk);
139 extern bool inet6_mc_check(struct sock *sk,
140                            const struct in6_addr *mc_addr,
141                            const struct in6_addr *src_addr);
142
143 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
144 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
145 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
146 extern void ipv6_mc_up(struct inet6_dev *idev);
147 extern void ipv6_mc_down(struct inet6_dev *idev);
148 extern void ipv6_mc_unmap(struct inet6_dev *idev);
149 extern void ipv6_mc_remap(struct inet6_dev *idev);
150 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
151 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
152 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
153
154 extern bool ipv6_chk_mcast_addr(struct net_device *dev,
155                                 const struct in6_addr *group,
156                                 const struct in6_addr *src_addr);
157
158 /*
159  * identify MLD packets for MLD filter exceptions
160  */
161 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
162 {
163         struct icmp6hdr *hdr;
164
165         if (nexthdr != IPPROTO_ICMPV6 ||
166             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
167                 return false;
168
169         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
170
171         switch (hdr->icmp6_type) {
172         case ICMPV6_MGM_QUERY:
173         case ICMPV6_MGM_REPORT:
174         case ICMPV6_MGM_REDUCTION:
175         case ICMPV6_MLD2_REPORT:
176                 return true;
177         default:
178                 break;
179         }
180         return false;
181 }
182
183 extern void addrconf_prefix_rcv(struct net_device *dev,
184                                 u8 *opt, int len, bool sllao);
185
186 /*
187  *      anycast prototypes (anycast.c)
188  */
189 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
190 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
191 extern void ipv6_sock_ac_close(struct sock *sk);
192
193 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
194 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
195 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
196                                 const struct in6_addr *addr);
197
198
199 /* Device notifier */
200 extern int register_inet6addr_notifier(struct notifier_block *nb);
201 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
202
203 extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
204                                          struct ipv6_devconf *devconf);
205
206 /**
207  * __in6_dev_get - get inet6_dev pointer from netdevice
208  * @dev: network device
209  *
210  * Caller must hold rcu_read_lock or RTNL, because this function
211  * does not take a reference on the inet6_dev.
212  */
213 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
214 {
215         return rcu_dereference_rtnl(dev->ip6_ptr);
216 }
217
218 /**
219  * in6_dev_get - get inet6_dev pointer from netdevice
220  * @dev: network device
221  *
222  * This version can be used in any context, and takes a reference
223  * on the inet6_dev. Callers must use in6_dev_put() later to
224  * release this reference.
225  */
226 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
227 {
228         struct inet6_dev *idev;
229
230         rcu_read_lock();
231         idev = rcu_dereference(dev->ip6_ptr);
232         if (idev)
233                 atomic_inc(&idev->refcnt);
234         rcu_read_unlock();
235         return idev;
236 }
237
238 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
239
240 static inline void in6_dev_put(struct inet6_dev *idev)
241 {
242         if (atomic_dec_and_test(&idev->refcnt))
243                 in6_dev_finish_destroy(idev);
244 }
245
246 static inline void __in6_dev_put(struct inet6_dev *idev)
247 {
248         atomic_dec(&idev->refcnt);
249 }
250
251 static inline void in6_dev_hold(struct inet6_dev *idev)
252 {
253         atomic_inc(&idev->refcnt);
254 }
255
256 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
257
258 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
259 {
260         if (atomic_dec_and_test(&ifp->refcnt))
261                 inet6_ifa_finish_destroy(ifp);
262 }
263
264 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
265 {
266         atomic_dec(&ifp->refcnt);
267 }
268
269 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
270 {
271         atomic_inc(&ifp->refcnt);
272 }
273
274
275 /*
276  *      compute link-local solicited-node multicast address
277  */
278
279 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
280                                              struct in6_addr *solicited)
281 {
282         ipv6_addr_set(solicited,
283                       htonl(0xFF020000), 0,
284                       htonl(0x1),
285                       htonl(0xFF000000) | addr->s6_addr32[3]);
286 }
287
288 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
289 {
290         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
291 }
292
293 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
294 {
295 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
296         __u64 *p = (__u64 *)addr;
297         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
298 #else
299         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
300                 addr->s6_addr32[1] | addr->s6_addr32[2] |
301                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
302 #endif
303 }
304
305 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
306 {
307 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
308         __u64 *p = (__u64 *)addr;
309         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
310 #else
311         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
312                 addr->s6_addr32[1] | addr->s6_addr32[2] |
313                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
314 #endif
315 }
316
317 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
318 {
319         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
320 }
321
322 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
323 {
324 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
325         __u64 *p = (__u64 *)addr;
326         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
327                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
328                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
329 #else
330         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
331                 addr->s6_addr32[1] |
332                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
333                 (addr->s6_addr[12] ^ 0xff)) == 0;
334 #endif
335 }
336
337 #ifdef CONFIG_PROC_FS
338 extern int if6_proc_init(void);
339 extern void if6_proc_exit(void);
340 #endif
341
342 #endif