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                 (3)
  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 #include <linux/netdevice.h>
  46 #include <net/if_inet6.h>
  47 #include <net/ipv6.h>
  48
  49 #define IN6_ADDR_HSIZE_SHIFT    4
  50 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  51
  52 extern int                      addrconf_init(void);
  53 extern void                     addrconf_cleanup(void);
  54
  55 extern int                      addrconf_add_ifaddr(struct net *net,
  56                                                     void __user *arg);
  57 extern int                      addrconf_del_ifaddr(struct net *net,
  58                                                     void __user *arg);
  59 extern int                      addrconf_set_dstaddr(struct net *net,
  60                                                      void __user *arg);
  61
  62 extern int                      ipv6_chk_addr(struct net *net,
  63                                               const struct in6_addr *addr,
  64                                               struct net_device *dev,
  65                                               int strict);
  66
  67 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  68 extern int                      ipv6_chk_home_addr(struct net *net,
  69                                                    const struct in6_addr *addr);
  70 #endif
  71
  72 extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
  73                                                 struct net_device *dev);
  74
  75 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
  76                                                  const struct in6_addr *addr,
  77                                                  struct net_device *dev,
  78                                                  int strict);
  79
  80 extern int                      ipv6_dev_get_saddr(struct net *net,
  81                                                const struct net_device *dev,
  82                                                const struct in6_addr *daddr,
  83                                                unsigned int srcprefs,
  84                                                struct in6_addr *saddr);
  85 extern int                      ipv6_get_lladdr(struct net_device *dev,
  86                                                 struct in6_addr *addr,
  87                                                 unsigned char banned_flags);
  88 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
  89                                                     const struct sock *sk2);
  90 extern void                     addrconf_join_solict(struct net_device *dev,
  91                                         const struct in6_addr *addr);
  92 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
  93                                         const struct in6_addr *addr);
  94
  95 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
  96                                                    unsigned int unit)
  97 {
  98         if (timeout == 0xffffffff)
  99                 return ~0UL;
 100
 101         /*
 102          * Avoid arithmetic overflow.
 103          * Assuming unit is constant and non-zero, this "if" statement
 104          * will go away on 64bit archs.
 105          */
 106         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 107                 return LONG_MAX / unit;
 108
 109         return timeout;
 110 }
 111
 112 static inline int addrconf_finite_timeout(unsigned long timeout)
 113 {
 114         return ~timeout;
 115 }
 116
 117 /*
 118  *      IPv6 Address Label subsystem (addrlabel.c)
 119  */
 120 extern int                      ipv6_addr_label_init(void);
 121 extern void                     ipv6_addr_label_cleanup(void);
 122 extern void                     ipv6_addr_label_rtnl_register(void);
 123 extern u32                      ipv6_addr_label(struct net *net,
 124                                                 const struct in6_addr *addr,
 125                                                 int type, int ifindex);
 126
 127 /*
 128  *      multicast prototypes (mcast.c)
 129  */
 130 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 131                              const struct in6_addr *addr);
 132 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 133                              const struct in6_addr *addr);
 134 extern void ipv6_sock_mc_close(struct sock *sk);
 135 extern bool inet6_mc_check(struct sock *sk,
 136                            const struct in6_addr *mc_addr,
 137                            const struct in6_addr *src_addr);
 138
 139 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 140 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 141 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 142 extern void ipv6_mc_up(struct inet6_dev *idev);
 143 extern void ipv6_mc_down(struct inet6_dev *idev);
 144 extern void ipv6_mc_unmap(struct inet6_dev *idev);
 145 extern void ipv6_mc_remap(struct inet6_dev *idev);
 146 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 147 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 148 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 149
 150 extern bool ipv6_chk_mcast_addr(struct net_device *dev,
 151                                 const struct in6_addr *group,
 152                                 const struct in6_addr *src_addr);
 153
 154 /*
 155  * identify MLD packets for MLD filter exceptions
 156  */
 157 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 158 {
 159         struct icmp6hdr *hdr;
 160
 161         if (nexthdr != IPPROTO_ICMPV6 ||
 162             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 163                 return false;
 164
 165         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 166
 167         switch (hdr->icmp6_type) {
 168         case ICMPV6_MGM_QUERY:
 169         case ICMPV6_MGM_REPORT:
 170         case ICMPV6_MGM_REDUCTION:
 171         case ICMPV6_MLD2_REPORT:
 172                 return true;
 173         default:
 174                 break;
 175         }
 176         return false;
 177 }
 178
 179 extern void addrconf_prefix_rcv(struct net_device *dev,
 180                                 u8 *opt, int len, bool sllao);
 181
 182 /*
 183  *      anycast prototypes (anycast.c)
 184  */
 185 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
 186 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
 187 extern void ipv6_sock_ac_close(struct sock *sk);
 188
 189 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 190 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 191 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 192                                 const struct in6_addr *addr);
 193
 194
 195 /* Device notifier */
 196 extern int register_inet6addr_notifier(struct notifier_block *nb);
 197 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 198
 199 extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 200                                          struct ipv6_devconf *devconf);
 201
 202 /**
 203  * __in6_dev_get - get inet6_dev pointer from netdevice
 204  * @dev: network device
 205  *
 206  * Caller must hold rcu_read_lock or RTNL, because this function
 207  * does not take a reference on the inet6_dev.
 208  */
 209 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 210 {
 211         return rcu_dereference_rtnl(dev->ip6_ptr);
 212 }
 213
 214 /**
 215  * in6_dev_get - get inet6_dev pointer from netdevice
 216  * @dev: network device
 217  *
 218  * This version can be used in any context, and takes a reference
 219  * on the inet6_dev. Callers must use in6_dev_put() later to
 220  * release this reference.
 221  */
 222 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 223 {
 224         struct inet6_dev *idev;
 225
 226         rcu_read_lock();
 227         idev = rcu_dereference(dev->ip6_ptr);
 228         if (idev)
 229                 atomic_inc(&idev->refcnt);
 230         rcu_read_unlock();
 231         return idev;
 232 }
 233
 234 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 235
 236 static inline void in6_dev_put(struct inet6_dev *idev)
 237 {
 238         if (atomic_dec_and_test(&idev->refcnt))
 239                 in6_dev_finish_destroy(idev);
 240 }
 241
 242 static inline void __in6_dev_put(struct inet6_dev *idev)
 243 {
 244         atomic_dec(&idev->refcnt);
 245 }
 246
 247 static inline void in6_dev_hold(struct inet6_dev *idev)
 248 {
 249         atomic_inc(&idev->refcnt);
 250 }
 251
 252 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 253
 254 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 255 {
 256         if (atomic_dec_and_test(&ifp->refcnt))
 257                 inet6_ifa_finish_destroy(ifp);
 258 }
 259
 260 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 261 {
 262         atomic_dec(&ifp->refcnt);
 263 }
 264
 265 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 266 {
 267         atomic_inc(&ifp->refcnt);
 268 }
 269
 270
 271 /*
 272  *      compute link-local solicited-node multicast address
 273  */
 274
 275 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 276                                              struct in6_addr *solicited)
 277 {
 278         ipv6_addr_set(solicited,
 279                       htonl(0xFF020000), 0,
 280                       htonl(0x1),
 281                       htonl(0xFF000000) | addr->s6_addr32[3]);
 282 }
 283
 284 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 285 {
 286         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 287 }
 288
 289 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 290 {
 291         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 292                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 293                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 294 }
 295
 296 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 297 {
 298         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 299                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 300                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 301 }
 302
 303 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 304 {
 305         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 306 }
 307
 308 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 309 {
 310 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 311         __u64 *p = (__u64 *)addr;
 312         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 313                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 314                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 315 #else
 316         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 317                 addr->s6_addr32[1] |
 318                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 319                 (addr->s6_addr[12] ^ 0xff)) == 0;
 320 #endif
 321 }
 322
 323 #ifdef CONFIG_PROC_FS
 324 extern int if6_proc_init(void);
 325 extern void if6_proc_exit(void);
 326 #endif
 327
 328 #endif