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_cleanup(void);
 125 extern void                     ipv6_addr_label_rtnl_register(void);
 126 extern u32                      ipv6_addr_label(struct net *net,
 127                                                 const struct in6_addr *addr,
 128                                                 int type, int ifindex);
 129
 130 /*
 131  *      multicast prototypes (mcast.c)
 132  */
 133 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 134                              const struct in6_addr *addr);
 135 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 136                              const struct in6_addr *addr);
 137 extern void ipv6_sock_mc_close(struct sock *sk);
 138 extern int inet6_mc_check(struct sock *sk,
 139                           const struct in6_addr *mc_addr,
 140                           const struct in6_addr *src_addr);
 141
 142 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 143 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 144 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 145 extern void ipv6_mc_up(struct inet6_dev *idev);
 146 extern void ipv6_mc_down(struct inet6_dev *idev);
 147 extern void ipv6_mc_unmap(struct inet6_dev *idev);
 148 extern void ipv6_mc_remap(struct inet6_dev *idev);
 149 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 150 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 151 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 152
 153 extern int ipv6_chk_mcast_addr(struct net_device *dev,
 154                                const struct in6_addr *group,
 155                                const struct in6_addr *src_addr);
 156 extern int ipv6_is_mld(struct sk_buff *skb, int nexthdr);
 157
 158 extern void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len);
 159
 160 /*
 161  *      anycast prototypes (anycast.c)
 162  */
 163 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex,struct in6_addr *addr);
 164 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex,struct in6_addr *addr);
 165 extern void ipv6_sock_ac_close(struct sock *sk);
 166 extern int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex);
 167
 168 extern int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr);
 169 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr);
 170 extern int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 171                                struct in6_addr *addr);
 172
 173
 174 /* Device notifier */
 175 extern int register_inet6addr_notifier(struct notifier_block *nb);
 176 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 177
 178 /**
 179  * __in6_dev_get - get inet6_dev pointer from netdevice
 180  * @dev: network device
 181  *
 182  * Caller must hold rcu_read_lock or RTNL, because this function
 183  * does not take a reference on the inet6_dev.
 184  */
 185 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 186 {
 187         return rcu_dereference_rtnl(dev->ip6_ptr);
 188 }
 189
 190 /**
 191  * in6_dev_get - get inet6_dev pointer from netdevice
 192  * @dev: network device
 193  *
 194  * This version can be used in any context, and takes a reference
 195  * on the inet6_dev. Callers must use in6_dev_put() later to
 196  * release this reference.
 197  */
 198 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 199 {
 200         struct inet6_dev *idev;
 201
 202         rcu_read_lock();
 203         idev = rcu_dereference(dev->ip6_ptr);
 204         if (idev)
 205                 atomic_inc(&idev->refcnt);
 206         rcu_read_unlock();
 207         return idev;
 208 }
 209
 210 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 211
 212 static inline void in6_dev_put(struct inet6_dev *idev)
 213 {
 214         if (atomic_dec_and_test(&idev->refcnt))
 215                 in6_dev_finish_destroy(idev);
 216 }
 217
 218 static inline void __in6_dev_put(struct inet6_dev *idev)
 219 {
 220         atomic_dec(&idev->refcnt);
 221 }
 222
 223 static inline void in6_dev_hold(struct inet6_dev *idev)
 224 {
 225         atomic_inc(&idev->refcnt);
 226 }
 227
 228 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 229
 230 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 231 {
 232         if (atomic_dec_and_test(&ifp->refcnt))
 233                 inet6_ifa_finish_destroy(ifp);
 234 }
 235
 236 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 237 {
 238         atomic_dec(&ifp->refcnt);
 239 }
 240
 241 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 242 {
 243         atomic_inc(&ifp->refcnt);
 244 }
 245
 246
 247 /*
 248  *      compute link-local solicited-node multicast address
 249  */
 250
 251 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 252                                              struct in6_addr *solicited)
 253 {
 254         ipv6_addr_set(solicited,
 255                       htonl(0xFF020000), 0,
 256                       htonl(0x1),
 257                       htonl(0xFF000000) | addr->s6_addr32[3]);
 258 }
 259
 260 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
 261 {
 262         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 263 }
 264
 265 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 266 {
 267         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 268                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 269                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 270 }
 271
 272 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 273 {
 274         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 275                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 276                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 277 }
 278
 279 static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
 280 {
 281         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 282 }
 283
 284 #ifdef CONFIG_PROC_FS
 285 extern int if6_proc_init(void);
 286 extern void if6_proc_exit(void);
 287 #endif
 288
 289 #endif
 290 #endif