include/net1/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_get_lladdr(struct net_device *dev, struct in6_addr *);
  62
  63 /*
  64  *      multicast prototypes (mcast.c)
  65  */
  66 extern int                      ipv6_sock_mc_join(struct sock *sk,
  67                                                   int ifindex,
  68                                                   struct in6_addr *addr);
  69 extern int                      ipv6_sock_mc_drop(struct sock *sk,
  70                                                   int ifindex,
  71                                                   struct in6_addr *addr);
  72 extern void                     ipv6_sock_mc_close(struct sock *sk);
  73 extern int                      inet6_mc_check(struct sock *sk, struct in6_addr *addr);
  74
  75 extern int                      ipv6_dev_mc_inc(struct net_device *dev,
  76                                                 struct in6_addr *addr);
  77 extern int                      ipv6_dev_mc_dec(struct net_device *dev,
  78                                                 struct in6_addr *addr);
  79 extern void                     ipv6_mc_up(struct inet6_dev *idev);
  80 extern void                     ipv6_mc_down(struct inet6_dev *idev);
  81 extern void                     ipv6_mc_init_dev(struct inet6_dev *idev);
  82 extern void                     ipv6_mc_destroy_dev(struct inet6_dev *idev);
  83 extern void                     addrconf_dad_failure(struct inet6_ifaddr *ifp);
  84
  85 extern int                      ipv6_chk_mcast_addr(struct net_device *dev,
  86                                                     struct in6_addr *addr);
  87
  88 extern void                     addrconf_prefix_rcv(struct net_device *dev,
  89                                                     u8 *opt, int len);
  90
  91 /* Device notifier */
  92 extern int register_inet6addr_notifier(struct notifier_block *nb);
  93 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
  94
  95 static inline struct inet6_dev *
  96 __in6_dev_get(struct net_device *dev)
  97 {
  98         return (struct inet6_dev *)dev->ip6_ptr;
  99 }
 100
 101 extern rwlock_t addrconf_lock;
 102
 103 static inline struct inet6_dev *
 104 in6_dev_get(struct net_device *dev)
 105 {
 106         struct inet6_dev *idev = NULL;
 107         read_lock(&addrconf_lock);
 108         idev = dev->ip6_ptr;
 109         if (idev)
 110                 atomic_inc(&idev->refcnt);
 111         read_unlock(&addrconf_lock);
 112         return idev;
 113 }
 114
 115 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 116
 117 static inline void
 118 in6_dev_put(struct inet6_dev *idev)
 119 {
 120         if (atomic_dec_and_test(&idev->refcnt))
 121                 in6_dev_finish_destroy(idev);
 122 }
 123
 124 #define __in6_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 125 #define in6_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 126
 127
 128 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 129
 130 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 131 {
 132         if (atomic_dec_and_test(&ifp->refcnt))
 133                 inet6_ifa_finish_destroy(ifp);
 134 }
 135
 136 #define __in6_ifa_put(idev)  atomic_dec(&(idev)->refcnt)
 137 #define in6_ifa_hold(idev)   atomic_inc(&(idev)->refcnt)
 138
 139
 140 extern void                     addrconf_forwarding_on(void);
 141 /*
 142  *      Hash function taken from net_alias.c
 143  */
 144
 145 static __inline__ u8 ipv6_addr_hash(struct in6_addr *addr)
 146 {
 147         __u32 word;
 148
 149         /*
 150          * We perform the hash function over the last 64 bits of the address
 151          * This will include the IEEE address token on links that support it.
 152          */
 153
 154         word = addr->s6_addr[2] ^ addr->s6_addr32[3];
 155         word  ^= (word>>16);
 156         word ^= (word >> 8);
 157
 158         return ((word ^ (word >> 4)) & 0x0f);
 159 }
 160
 161 /*
 162  *      compute link-local solicited-node multicast address
 163  */
 164
 165 static inline void addrconf_addr_solict_mult(struct in6_addr *addr,
 166                                              struct in6_addr *solicited)
 167 {
 168         ipv6_addr_set(solicited,
 169                       __constant_htonl(0xFF020000), 0,
 170                       __constant_htonl(0x1),
 171                       __constant_htonl(0xFF000000) | addr->s6_addr32[3]);
 172 }
 173
 174
 175 static inline void ipv6_addr_all_nodes(struct in6_addr *addr)
 176 {
 177         ipv6_addr_set(addr,
 178                       __constant_htonl(0xFF020000), 0, 0,
 179                       __constant_htonl(0x1));
 180 }
 181
 182 static inline void ipv6_addr_all_routers(struct in6_addr *addr)
 183 {
 184         ipv6_addr_set(addr,
 185                       __constant_htonl(0xFF020000), 0, 0,
 186                       __constant_htonl(0x2));
 187 }
 188
 189 static inline int ipv6_addr_is_multicast(struct in6_addr *addr)
 190 {
 191         return (addr->s6_addr32[0] & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000);
 192 }
 193
 194 static inline int ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 195 {
 196         return (addr->s6_addr32[0] == htonl(0xff020000) &&
 197                 addr->s6_addr32[1] == 0 &&
 198                 addr->s6_addr32[2] == 0 &&
 199                 addr->s6_addr32[3] == htonl(0x00000001));
 200 }
 201
 202 static inline int ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 203 {
 204         return (addr->s6_addr32[0] == htonl(0xff020000) &&
 205                 addr->s6_addr32[1] == 0 &&
 206                 addr->s6_addr32[2] == 0 &&
 207                 addr->s6_addr32[3] == htonl(0x00000002));
 208 }
 209
 210 #endif
 211 #endif