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 #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
 175 /**
 176  * __in6_dev_get - get inet6_dev pointer from netdevice
 177  * @dev: network device
 178  *
 179  * Caller must hold rcu_read_lock or RTNL, because this function
 180  * does not take a reference on the inet6_dev.
 181  */
 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
 187 /**
 188  * in6_dev_get - get inet6_dev pointer from netdevice
 189  * @dev: network device
 190  *
 191  * This version can be used in any context, and takes a reference
 192  * on the inet6_dev. Callers must use in6_dev_put() later to
 193  * release this reference.
 194  */
 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