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 struct prefix_info {
  21         __u8                    type;
  22         __u8                    length;
  23         __u8                    prefix_len;
  24
  25 #if defined(__BIG_ENDIAN_BITFIELD)
  26         __u8                    onlink : 1,
  27                                 autoconf : 1,
  28                                 reserved : 6;
  29 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  30         __u8                    reserved : 6,
  31                                 autoconf : 1,
  32                                 onlink : 1;
  33 #else
  34 #error "Please fix <asm/byteorder.h>"
  35 #endif
  36         __u32                   valid;
  37         __u32                   prefered;
  38         __u32                   reserved2;
  39
  40         struct in6_addr         prefix;
  41 };
  42
  43
  44 #ifdef __KERNEL__
  45
  46 #include <linux/in6.h>
  47 #include <linux/netdevice.h>
  48 #include <net/if_inet6.h>
  49
  50 #define IN6_ADDR_HSIZE          16
  51
  52 extern void                     addrconf_init(void);
  53 extern void                     addrconf_cleanup(void);
  54
  55 extern int                      addrconf_add_ifaddr(void __user *arg);
  56 extern int                      addrconf_del_ifaddr(void __user *arg);
  57 extern int                      addrconf_set_dstaddr(void __user *arg);
  58
  59 extern int                      ipv6_chk_addr(struct in6_addr *addr,
  60                                               struct net_device *dev,
  61                                               int strict);
  62 extern struct inet6_ifaddr *    ipv6_get_ifaddr(struct in6_addr *addr,
  63                                                 struct net_device *dev,
  64                                                 int strict);
  65 extern int                      ipv6_get_saddr(struct dst_entry *dst,
  66                                                struct in6_addr *daddr,
  67                                                struct in6_addr *saddr);
  68 extern int                      ipv6_dev_get_saddr(struct net_device *dev,
  69                                                struct in6_addr *daddr,
  70                                                struct in6_addr *saddr,
  71                                                int onlink);
  72 extern int                      ipv6_get_lladdr(struct net_device *dev, struct in6_addr *);
  73 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
  74                                                       const struct sock *sk2);
  75 extern void                     addrconf_join_solict(struct net_device *dev,
  76                                         struct in6_addr *addr);
  77 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
  78                                         struct in6_addr *addr);
  79
  80 /*
  81  *      multicast prototypes (mcast.c)
  82  */
  83 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
  84                   struct in6_addr *addr);
  85 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
  86                   struct in6_addr *addr);
  87 extern void ipv6_sock_mc_close(struct sock *sk);
  88 extern int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
  89                 struct in6_addr *src_addr);
  90
  91 extern int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr);
  92 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
  93 extern int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr);
  94 extern void ipv6_mc_up(struct inet6_dev *idev);
  95 extern void ipv6_mc_down(struct inet6_dev *idev);
  96 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
  97 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
  98 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
  99
 100 extern int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
 101                 struct in6_addr *src_addr);
 102 extern int ipv6_is_mld(struct sk_buff *skb, int nexthdr);
 103
 104 extern void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len);
 105
 106 /*
 107  *      anycast prototypes (anycast.c)
 108  */
 109 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex,struct in6_addr *addr);
 110 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex,struct in6_addr *addr);
 111 extern void ipv6_sock_ac_close(struct sock *sk);
 112 extern int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex);
 113
 114 extern int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr);
 115 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr);
 116 extern int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr);
 117 extern int ipv6_chk_acast_addr(struct net_device *dev, struct in6_addr *addr);
 118
 119
 120 /* Device notifier */
 121 extern int register_inet6addr_notifier(struct notifier_block *nb);
 122 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 123
 124 static inline struct inet6_dev *
 125 __in6_dev_get(struct net_device *dev)
 126 {
 127         return (struct inet6_dev *)dev->ip6_ptr;
 128 }
 129
 130 extern rwlock_t addrconf_lock;
 131
 132 static inline struct inet6_dev *
 133 in6_dev_get(struct net_device *dev)
 134 {
 135         struct inet6_dev *idev = NULL;
 136         read_lock(&addrconf_lock);
 137         idev = dev->ip6_ptr;
 138         if (idev)
 139                 atomic_inc(&idev->refcnt);
 140         read_unlock(&addrconf_lock);
 141         return idev;
 142 }
 143
 144 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 145
 146 static inline void
 147 in6_dev_put(struct inet6_dev *idev)
 148 {
 149         if (atomic_dec_and_test(&idev->refcnt))
 150                 in6_dev_finish_destroy(idev);
 151 }
 152
 153 #define __in6_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 154 #define in6_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 155
 156
 157 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 158
 159 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 160 {
 161         if (atomic_dec_and_test(&ifp->refcnt))
 162                 inet6_ifa_finish_destroy(ifp);
 163 }
 164
 165 #define __in6_ifa_put(ifp)      atomic_dec(&(ifp)->refcnt)
 166 #define in6_ifa_hold(ifp)       atomic_inc(&(ifp)->refcnt)
 167
 168
 169 extern void                     addrconf_forwarding_on(void);
 170 /*
 171  *      Hash function taken from net_alias.c
 172  */
 173
 174 static __inline__ u8 ipv6_addr_hash(const struct in6_addr *addr)
 175 {
 176         __u32 word;
 177
 178         /*
 179          * We perform the hash function over the last 64 bits of the address
 180          * This will include the IEEE address token on links that support it.
 181          */
 182
 183         word = addr->s6_addr32[2] ^ addr->s6_addr32[3];
 184         word ^= (word >> 16);
 185         word ^= (word >> 8);
 186
 187         return ((word ^ (word >> 4)) & 0x0f);
 188 }
 189
 190 /*
 191  *      compute link-local solicited-node multicast address
 192  */
 193
 194 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 195                                              struct in6_addr *solicited)
 196 {
 197         ipv6_addr_set(solicited,
 198                       __constant_htonl(0xFF020000), 0,
 199                       __constant_htonl(0x1),
 200                       __constant_htonl(0xFF000000) | addr->s6_addr32[3]);
 201 }
 202
 203
 204 static inline void ipv6_addr_all_nodes(struct in6_addr *addr)
 205 {
 206         ipv6_addr_set(addr,
 207                       __constant_htonl(0xFF020000), 0, 0,
 208                       __constant_htonl(0x1));
 209 }
 210
 211 static inline void ipv6_addr_all_routers(struct in6_addr *addr)
 212 {
 213         ipv6_addr_set(addr,
 214                       __constant_htonl(0xFF020000), 0, 0,
 215                       __constant_htonl(0x2));
 216 }
 217
 218 static inline int ipv6_addr_is_multicast(const struct in6_addr *addr)
 219 {
 220         return (addr->s6_addr32[0] & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000);
 221 }
 222
 223 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 224 {
 225         return (addr->s6_addr32[0] == htonl(0xff020000) &&
 226                 addr->s6_addr32[1] == 0 &&
 227                 addr->s6_addr32[2] == 0 &&
 228                 addr->s6_addr32[3] == htonl(0x00000001));
 229 }
 230
 231 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 232 {
 233         return (addr->s6_addr32[0] == htonl(0xff020000) &&
 234                 addr->s6_addr32[1] == 0 &&
 235                 addr->s6_addr32[2] == 0 &&
 236                 addr->s6_addr32[3] == htonl(0x00000002));
 237 }
 238
 239 #endif
 240 #endif