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                 (5)
  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 #ifdef __KERNEL__
  46
  47 #include <linux/netdevice.h>
  48 #include <net/if_inet6.h>
  49 #include <net/ipv6.h>
  50
  51 #define IN6_ADDR_HSIZE          16
  52
  53 extern int                      addrconf_init(void);
  54 extern void                     addrconf_cleanup(void);
  55
  56 extern int                      addrconf_add_ifaddr(struct net *net,
  57                                                     void __user *arg);
  58 extern int                      addrconf_del_ifaddr(struct net *net,
  59                                                     void __user *arg);
  60 extern int                      addrconf_set_dstaddr(struct net *net,
  61                                                      void __user *arg);
  62
  63 extern int                      ipv6_chk_addr(struct net *net,
  64                                               struct in6_addr *addr,
  65                                               struct net_device *dev,
  66                                               int strict);
  67
  68 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  69 extern int                      ipv6_chk_home_addr(struct net *net,
  70                                                    struct in6_addr *addr);
  71 #endif
  72
  73 extern int                      ipv6_chk_prefix(struct in6_addr *addr,
  74                                                 struct net_device *dev);
  75
  76 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
  77                                                  const struct in6_addr *addr,
  78                                                  struct net_device *dev,
  79                                                  int strict);
  80
  81 extern int                      ipv6_dev_get_saddr(struct net *net,
  82                                                struct net_device *dev,
  83                                                const struct in6_addr *daddr,
  84                                                unsigned int srcprefs,
  85                                                struct in6_addr *saddr);
  86 extern int                      ipv6_get_lladdr(struct net_device *dev,
  87                                                 struct in6_addr *addr,
  88                                                 unsigned char banned_flags);
  89 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
  90                                                     const struct sock *sk2);
  91 extern void                     addrconf_join_solict(struct net_device *dev,
  92                                         struct in6_addr *addr);
  93 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
  94                                         struct in6_addr *addr);
  95
  96 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
  97                                                     unsigned unit)
  98 {
  99         if (timeout == 0xffffffff)
 100                 return ~0UL;
 101
 102         /*
 103          * Avoid arithmetic overflow.
 104          * Assuming unit is constant and non-zero, this "if" statement
 105          * will go away on 64bit archs.
 106          */
 107         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 108                 return LONG_MAX / unit;
 109
 110         return timeout;
 111 }
 112
 113 static inline int addrconf_finite_timeout(unsigned long timeout)
 114 {
 115         return ~timeout;
 116 }
 117
 118 /*
 119  *      IPv6 Address Label subsystem (addrlabel.c)
 120  */
 121 extern int                      ipv6_addr_label_init(void);
 122 extern void                     ipv6_addr_label_cleanup(void);
 123 extern void                     ipv6_addr_label_rtnl_register(void);
 124 extern u32                      ipv6_addr_label(struct net *net,
 125                                                 const struct in6_addr *addr,
 126                                                 int type, int ifindex);
 127
 128 /*
 129  *      multicast prototypes (mcast.c)
 130  */
 131 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 132                              const struct in6_addr *addr);
 133 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 134                              const struct in6_addr *addr);
 135 extern void ipv6_sock_mc_close(struct sock *sk);
 136 extern int inet6_mc_check(struct sock *sk,
 137                           const struct in6_addr *mc_addr,
 138                           const struct in6_addr *src_addr);
 139
 140 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 141 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 142 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 143 extern void ipv6_mc_up(struct inet6_dev *idev);
 144 extern void ipv6_mc_down(struct inet6_dev *idev);
 145 extern void ipv6_mc_unmap(struct inet6_dev *idev);
 146 extern void ipv6_mc_remap(struct inet6_dev *idev);
 147 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 148 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 149 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 150
 151 extern int ipv6_chk_mcast_addr(struct net_device *dev,
 152                                const struct in6_addr *group,
 153                                const struct in6_addr *src_addr);
 154 extern int ipv6_is_mld(struct sk_buff *skb, int nexthdr);
 155
 156 extern void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len);
 157
 158 /*
 159  *      anycast prototypes (anycast.c)
 160  */
 161 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex,struct in6_addr *addr);
 162 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex,struct in6_addr *addr);
 163 extern void ipv6_sock_ac_close(struct sock *sk);
 164 extern int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex);
 165
 166 extern int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr);
 167 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr);
 168 extern int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 169                                struct in6_addr *addr);
 170
 171
 172 /* Device notifier */
 173 extern int register_inet6addr_notifier(struct notifier_block *nb);
 174 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 175
 176 /**
 177  * __in6_dev_get - get inet6_dev pointer from netdevice
 178  * @dev: network device
 179  *
 180  * Caller must hold rcu_read_lock or RTNL, because this function
 181  * does not take a reference on the inet6_dev.
 182  */
 183 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 184 {
 185         return rcu_dereference_rtnl(dev->ip6_ptr);
 186 }
 187
 188 /**
 189  * in6_dev_get - get inet6_dev pointer from netdevice
 190  * @dev: network device
 191  *
 192  * This version can be used in any context, and takes a reference
 193  * on the inet6_dev. Callers must use in6_dev_put() later to
 194  * release this reference.
 195  */
 196 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 197 {
 198         struct inet6_dev *idev;
 199
 200         rcu_read_lock();
 201         idev = rcu_dereference(dev->ip6_ptr);
 202         if (idev)
 203                 atomic_inc(&idev->refcnt);
 204         rcu_read_unlock();
 205         return idev;
 206 }
 207
 208 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 209
 210 static inline void in6_dev_put(struct inet6_dev *idev)
 211 {
 212         if (atomic_dec_and_test(&idev->refcnt))
 213                 in6_dev_finish_destroy(idev);
 214 }
 215
 216 static inline void __in6_dev_put(struct inet6_dev *idev)
 217 {
 218         atomic_dec(&idev->refcnt);
 219 }
 220
 221 static inline void in6_dev_hold(struct inet6_dev *idev)
 222 {
 223         atomic_inc(&idev->refcnt);
 224 }
 225
 226 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 227
 228 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 229 {
 230         if (atomic_dec_and_test(&ifp->refcnt))
 231                 inet6_ifa_finish_destroy(ifp);
 232 }
 233
 234 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 235 {
 236         atomic_dec(&ifp->refcnt);
 237 }
 238
 239 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 240 {
 241         atomic_inc(&ifp->refcnt);
 242 }
 243
 244
 245 /*
 246  *      compute link-local solicited-node multicast address
 247  */
 248
 249 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 250                                              struct in6_addr *solicited)
 251 {
 252         ipv6_addr_set(solicited,
 253                       htonl(0xFF020000), 0,
 254                       htonl(0x1),
 255                       htonl(0xFF000000) | addr->s6_addr32[3]);
 256 }
 257
 258 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
 259 {
 260         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 261 }
 262
 263 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 264 {
 265         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 266                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 267                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 268 }
 269
 270 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 271 {
 272         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 273                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 274                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 275 }
 276
 277 static inline int ipv6_addr_is_isatap(const struct in6_addr *addr)
 278 {
 279         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 280 }
 281
 282 #ifdef CONFIG_PROC_FS
 283 extern int if6_proc_init(void);
 284 extern void if6_proc_exit(void);
 285 #endif
 286
 287 #endif
 288 #endif