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 ADDR_CHECK_FREQUENCY            (120*HZ)
  10
  11 struct prefix_info {
  12         __u8                    type;
  13         __u8                    length;
  14         __u8                    prefix_len;
  15
  16 #if defined(__BIG_ENDIAN_BITFIELD)
  17         __u8                    onlink : 1,
  18                                 autoconf : 1,
  19                                 reserved : 6;
  20 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  21         __u8                    reserved : 6,
  22                                 autoconf : 1,
  23                                 onlink : 1;
  24 #else
  25 #error "Please fix <asm/byteorder.h>"
  26 #endif
  27         __u32                   valid;
  28         __u32                   prefered;
  29         __u32                   reserved2;
  30
  31         struct in6_addr         prefix;
  32 };
  33
  34
  35 #ifdef __KERNEL__
  36
  37 #include <linux/in6.h>
  38 #include <linux/netdevice.h>
  39 #include <net/if_inet6.h>
  40
  41 #define IN6_ADDR_HSIZE          16
  42
  43 extern void                     addrconf_init(void);
  44 extern void                     addrconf_cleanup(void);
  45
  46 extern int                      addrconf_notify(struct notifier_block *this,
  47                                                 unsigned long event,
  48                                                 void * data);
  49
  50 extern int                      addrconf_add_ifaddr(void *arg);
  51 extern int                      addrconf_del_ifaddr(void *arg);
  52 extern int                      addrconf_set_dstaddr(void *arg);
  53
  54 extern int                      ipv6_chk_addr(struct in6_addr *addr,
  55                                               struct net_device *dev);
  56 extern struct inet6_ifaddr *    ipv6_get_ifaddr(struct in6_addr *addr,
  57                                                 struct net_device *dev);
  58 extern int                      ipv6_get_saddr(struct dst_entry *dst,
  59                                                struct in6_addr *daddr,
  60                                                struct in6_addr *saddr);
  61 extern int                      ipv6_dev_get_saddr(struct net_device *dev,
  62                                                struct in6_addr *daddr,
  63                                                struct in6_addr *saddr,
  64                                                int onlink);
  65 extern int                      ipv6_get_lladdr(struct net_device *dev, struct in6_addr *);
  66 extern void                     addrconf_join_solict(struct net_device *dev,
  67                                         struct in6_addr *addr);
  68 extern void                     addrconf_leave_solict(struct net_device *dev,
  69                                         struct in6_addr *addr);
  70
  71 /*
  72  *      multicast prototypes (mcast.c)
  73  */
  74 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
  75                   struct in6_addr *addr);
  76 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
  77                   struct in6_addr *addr);
  78 extern void ipv6_sock_mc_close(struct sock *sk);
  79 extern int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
  80                 struct in6_addr *src_addr);
  81
  82 extern int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr);
  83 extern int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr);
  84 extern void ipv6_mc_up(struct inet6_dev *idev);
  85 extern void ipv6_mc_down(struct inet6_dev *idev);
  86 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
  87 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
  88 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
  89
  90 extern int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
  91                 struct in6_addr *src_addr);
  92
  93 extern void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len);
  94
  95 /*
  96  *      anycast prototypes (anycast.c)
  97  */
  98 extern int                      ipv6_sock_ac_join(struct sock *sk,
  99                                                   int ifindex,
 100                                                   struct in6_addr *addr);
 101 extern int                      ipv6_sock_ac_drop(struct sock *sk,
 102                                                   int ifindex,
 103                                                   struct in6_addr *addr);
 104 extern void                     ipv6_sock_ac_close(struct sock *sk);
 105 extern int                      inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex);
 106
 107 extern int                      ipv6_dev_ac_inc(struct net_device *dev,
 108                                                 struct in6_addr *addr);
 109 extern int                      ipv6_dev_ac_dec(struct net_device *dev,
 110                                                 struct in6_addr *addr);
 111 extern int                      ipv6_chk_acast_addr(struct net_device *dev,
 112                                                 struct in6_addr *addr);
 113
 114
 115 /* Device notifier */
 116 extern int register_inet6addr_notifier(struct notifier_block *nb);
 117 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 118
 119 static inline struct inet6_dev *
 120 __in6_dev_get(struct net_device *dev)
 121 {
 122         return (struct inet6_dev *)dev->ip6_ptr;
 123 }
 124
 125 extern rwlock_t addrconf_lock;
 126
 127 static inline struct inet6_dev *
 128 in6_dev_get(struct net_device *dev)
 129 {
 130         struct inet6_dev *idev = NULL;
 131         read_lock(&addrconf_lock);
 132         idev = dev->ip6_ptr;
 133         if (idev)
 134                 atomic_inc(&idev->refcnt);
 135         read_unlock(&addrconf_lock);
 136         return idev;
 137 }
 138
 139 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 140
 141 static inline void
 142 in6_dev_put(struct inet6_dev *idev)
 143 {
 144         if (atomic_dec_and_test(&idev->refcnt))
 145                 in6_dev_finish_destroy(idev);
 146 }
 147
 148 #define __in6_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 149 #define in6_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 150
 151
 152 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 153
 154 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 155 {
 156         if (atomic_dec_and_test(&ifp->refcnt))
 157                 inet6_ifa_finish_destroy(ifp);
 158 }
 159
 160 #define __in6_ifa_put(idev)  atomic_dec(&(idev)->refcnt)
 161 #define in6_ifa_hold(idev)   atomic_inc(&(idev)->refcnt)
 162
 163
 164 extern void                     addrconf_forwarding_on(void);
 165 /*
 166  *      Hash function taken from net_alias.c
 167  */
 168
 169 static __inline__ u8 ipv6_addr_hash(const struct in6_addr *addr)
 170 {
 171         __u32 word;
 172
 173         /*
 174          * We perform the hash function over the last 64 bits of the address
 175          * This will include the IEEE address token on links that support it.
 176          */
 177
 178         word = addr->s6_addr[2] ^ addr->s6_addr32[3];
 179         word  ^= (word>>16);
 180         word ^= (word >> 8);
 181
 182         return ((word ^ (word >> 4)) & 0x0f);
 183 }
 184
 185 /*
 186  *      compute link-local solicited-node multicast address
 187  */
 188
 189 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 190                                              struct in6_addr *solicited)
 191 {
 192         ipv6_addr_set(solicited,
 193                       __constant_htonl(0xFF020000), 0,
 194                       __constant_htonl(0x1),
 195                       __constant_htonl(0xFF000000) | addr->s6_addr32[3]);
 196 }
 197
 198
 199 static inline void ipv6_addr_all_nodes(struct in6_addr *addr)
 200 {
 201         ipv6_addr_set(addr,
 202                       __constant_htonl(0xFF020000), 0, 0,
 203                       __constant_htonl(0x1));
 204 }
 205
 206 static inline void ipv6_addr_all_routers(struct in6_addr *addr)
 207 {
 208         ipv6_addr_set(addr,
 209                       __constant_htonl(0xFF020000), 0, 0,
 210                       __constant_htonl(0x2));
 211 }
 212
 213 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
 214 {
 215         return (addr->s6_addr32[0] & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000);
 216 }
 217
 218 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 219 {
 220         return (addr->s6_addr32[0] == htonl(0xff020000) &&
 221                 addr->s6_addr32[1] == 0 &&
 222                 addr->s6_addr32[2] == 0 &&
 223                 addr->s6_addr32[3] == htonl(0x00000001));
 224 }
 225
 226 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 227 {
 228         return (addr->s6_addr32[0] == htonl(0xff020000) &&
 229                 addr->s6_addr32[1] == 0 &&
 230                 addr->s6_addr32[2] == 0 &&
 231                 addr->s6_addr32[3] == htonl(0x00000002));
 232 }
 233
 234 #endif
 235 #endif