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