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Linux/include/net/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          16
 50 
 51 extern int                      addrconf_init(void);
 52 extern void                     addrconf_cleanup(void);
 53 
 54 extern int                      addrconf_add_ifaddr(struct net *net,
 55                                                     void __user *arg);
 56 extern int                      addrconf_del_ifaddr(struct net *net,
 57                                                     void __user *arg);
 58 extern int                      addrconf_set_dstaddr(struct net *net,
 59                                                      void __user *arg);
 60 
 61 extern int                      ipv6_chk_addr(struct net *net,
 62                                               const struct in6_addr *addr,
 63                                               struct net_device *dev,
 64                                               int strict);
 65 
 66 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 67 extern int                      ipv6_chk_home_addr(struct net *net,
 68                                                    const struct in6_addr *addr);
 69 #endif
 70 
 71 extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
 72                                                 struct net_device *dev);
 73 
 74 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
 75                                                  const struct in6_addr *addr,
 76                                                  struct net_device *dev,
 77                                                  int strict);
 78 
 79 extern int                      ipv6_dev_get_saddr(struct net *net,
 80                                                struct net_device *dev,
 81                                                const struct in6_addr *daddr,
 82                                                unsigned int srcprefs,
 83                                                struct in6_addr *saddr);
 84 extern int                      ipv6_get_lladdr(struct net_device *dev,
 85                                                 struct in6_addr *addr,
 86                                                 unsigned char banned_flags);
 87 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
 88                                                     const struct sock *sk2);
 89 extern void                     addrconf_join_solict(struct net_device *dev,
 90                                         const struct in6_addr *addr);
 91 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
 92                                         const struct in6_addr *addr);
 93 
 94 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 95                                                    unsigned int unit)
 96 {
 97         if (timeout == 0xffffffff)
 98                 return ~0UL;
 99 
100         /*
101          * Avoid arithmetic overflow.
102          * Assuming unit is constant and non-zero, this "if" statement
103          * will go away on 64bit archs.
104          */
105         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
106                 return LONG_MAX / unit;
107 
108         return timeout;
109 }
110 
111 static inline int addrconf_finite_timeout(unsigned long timeout)
112 {
113         return ~timeout;
114 }
115 
116 /*
117  *      IPv6 Address Label subsystem (addrlabel.c)
118  */
119 extern int                      ipv6_addr_label_init(void);
120 extern void                     ipv6_addr_label_cleanup(void);
121 extern void                     ipv6_addr_label_rtnl_register(void);
122 extern u32                      ipv6_addr_label(struct net *net,
123                                                 const struct in6_addr *addr,
124                                                 int type, int ifindex);
125 
126 /*
127  *      multicast prototypes (mcast.c)
128  */
129 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
130                              const struct in6_addr *addr);
131 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
132                              const struct in6_addr *addr);
133 extern void ipv6_sock_mc_close(struct sock *sk);
134 extern bool inet6_mc_check(struct sock *sk,
135                            const struct in6_addr *mc_addr,
136                            const struct in6_addr *src_addr);
137 
138 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
139 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
140 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
141 extern void ipv6_mc_up(struct inet6_dev *idev);
142 extern void ipv6_mc_down(struct inet6_dev *idev);
143 extern void ipv6_mc_unmap(struct inet6_dev *idev);
144 extern void ipv6_mc_remap(struct inet6_dev *idev);
145 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
146 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
147 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
148 
149 extern bool ipv6_chk_mcast_addr(struct net_device *dev,
150                                 const struct in6_addr *group,
151                                 const struct in6_addr *src_addr);
152 extern bool ipv6_is_mld(struct sk_buff *skb, int nexthdr);
153 
154 extern void addrconf_prefix_rcv(struct net_device *dev,
155                                 u8 *opt, int len, bool sllao);
156 
157 /*
158  *      anycast prototypes (anycast.c)
159  */
160 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
161 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
162 extern void ipv6_sock_ac_close(struct sock *sk);
163 
164 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
165 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
166 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
167                                 const struct in6_addr *addr);
168 
169 
170 /* Device notifier */
171 extern int register_inet6addr_notifier(struct notifier_block *nb);
172 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
173 
174 /**
175  * __in6_dev_get - get inet6_dev pointer from netdevice
176  * @dev: network device
177  *
178  * Caller must hold rcu_read_lock or RTNL, because this function
179  * does not take a reference on the inet6_dev.
180  */
181 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
182 {
183         return rcu_dereference_rtnl(dev->ip6_ptr);
184 }
185 
186 /**
187  * in6_dev_get - get inet6_dev pointer from netdevice
188  * @dev: network device
189  *
190  * This version can be used in any context, and takes a reference
191  * on the inet6_dev. Callers must use in6_dev_put() later to
192  * release this reference.
193  */
194 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
195 {
196         struct inet6_dev *idev;
197 
198         rcu_read_lock();
199         idev = rcu_dereference(dev->ip6_ptr);
200         if (idev)
201                 atomic_inc(&idev->refcnt);
202         rcu_read_unlock();
203         return idev;
204 }
205 
206 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
207 
208 static inline void in6_dev_put(struct inet6_dev *idev)
209 {
210         if (atomic_dec_and_test(&idev->refcnt))
211                 in6_dev_finish_destroy(idev);
212 }
213 
214 static inline void __in6_dev_put(struct inet6_dev *idev)
215 {
216         atomic_dec(&idev->refcnt);
217 }
218 
219 static inline void in6_dev_hold(struct inet6_dev *idev)
220 {
221         atomic_inc(&idev->refcnt);
222 }
223 
224 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
225 
226 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
227 {
228         if (atomic_dec_and_test(&ifp->refcnt))
229                 inet6_ifa_finish_destroy(ifp);
230 }
231 
232 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
233 {
234         atomic_dec(&ifp->refcnt);
235 }
236 
237 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
238 {
239         atomic_inc(&ifp->refcnt);
240 }
241 
242 
243 /*
244  *      compute link-local solicited-node multicast address
245  */
246 
247 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
248                                              struct in6_addr *solicited)
249 {
250         ipv6_addr_set(solicited,
251                       htonl(0xFF020000), 0,
252                       htonl(0x1),
253                       htonl(0xFF000000) | addr->s6_addr32[3]);
254 }
255 
256 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
257 {
258         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
259 }
260 
261 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
262 {
263         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
264                 addr->s6_addr32[1] | addr->s6_addr32[2] |
265                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
266 }
267 
268 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
269 {
270         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
271                 addr->s6_addr32[1] | addr->s6_addr32[2] |
272                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
273 }
274 
275 static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
276 {
277         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
278 }
279 
280 #ifdef CONFIG_PROC_FS
281 extern int if6_proc_init(void);
282 extern void if6_proc_exit(void);
283 #endif
284 
285 #endif
286 

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