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 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
  19 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
  20 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
  21
  22 #include <linux/in.h>
  23 #include <linux/in6.h>
  24
  25 struct prefix_info {
  26         __u8                    type;
  27         __u8                    length;
  28         __u8                    prefix_len;
  29
  30 #if defined(__BIG_ENDIAN_BITFIELD)
  31         __u8                    onlink : 1,
  32                                 autoconf : 1,
  33                                 reserved : 6;
  34 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  35         __u8                    reserved : 6,
  36                                 autoconf : 1,
  37                                 onlink : 1;
  38 #else
  39 #error "Please fix <asm/byteorder.h>"
  40 #endif
  41         __be32                  valid;
  42         __be32                  prefered;
  43         __be32                  reserved2;
  44
  45         struct in6_addr         prefix;
  46 };
  47
  48
  49 #include <linux/netdevice.h>
  50 #include <net/if_inet6.h>
  51 #include <net/ipv6.h>
  52
  53 #define IN6_ADDR_HSIZE_SHIFT    4
  54 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  55
  56 extern int                      addrconf_init(void);
  57 extern void                     addrconf_cleanup(void);
  58
  59 extern int                      addrconf_add_ifaddr(struct net *net,
  60                                                     void __user *arg);
  61 extern int                      addrconf_del_ifaddr(struct net *net,
  62                                                     void __user *arg);
  63 extern int                      addrconf_set_dstaddr(struct net *net,
  64                                                      void __user *arg);
  65
  66 extern int                      ipv6_chk_addr(struct net *net,
  67                                               const struct in6_addr *addr,
  68                                               const struct net_device *dev,
  69                                               int strict);
  70
  71 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  72 extern int                      ipv6_chk_home_addr(struct net *net,
  73                                                    const struct in6_addr *addr);
  74 #endif
  75
  76 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  77                                    const unsigned int prefix_len,
  78                                    struct net_device *dev);
  79
  80 extern int                      ipv6_chk_prefix(const struct in6_addr *addr,
  81                                                 struct net_device *dev);
  82
  83 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
  84                                                  const struct in6_addr *addr,
  85                                                  struct net_device *dev,
  86                                                  int strict);
  87
  88 extern int                      ipv6_dev_get_saddr(struct net *net,
  89                                                const struct net_device *dev,
  90                                                const struct in6_addr *daddr,
  91                                                unsigned int srcprefs,
  92                                                struct in6_addr *saddr);
  93 extern int                      __ipv6_get_lladdr(struct inet6_dev *idev,
  94                                                   struct in6_addr *addr,
  95                                                   unsigned char banned_flags);
  96 extern int                      ipv6_get_lladdr(struct net_device *dev,
  97                                                 struct in6_addr *addr,
  98                                                 unsigned char banned_flags);
  99 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
 100                                                     const struct sock *sk2);
 101 extern void                     addrconf_join_solict(struct net_device *dev,
 102                                         const struct in6_addr *addr);
 103 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
 104                                         const struct in6_addr *addr);
 105
 106 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 107                                                    unsigned int unit)
 108 {
 109         if (timeout == 0xffffffff)
 110                 return ~0UL;
 111
 112         /*
 113          * Avoid arithmetic overflow.
 114          * Assuming unit is constant and non-zero, this "if" statement
 115          * will go away on 64bit archs.
 116          */
 117         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 118                 return LONG_MAX / unit;
 119
 120         return timeout;
 121 }
 122
 123 static inline int addrconf_finite_timeout(unsigned long timeout)
 124 {
 125         return ~timeout;
 126 }
 127
 128 /*
 129  *      IPv6 Address Label subsystem (addrlabel.c)
 130  */
 131 extern int                      ipv6_addr_label_init(void);
 132 extern void                     ipv6_addr_label_cleanup(void);
 133 extern void                     ipv6_addr_label_rtnl_register(void);
 134 extern u32                      ipv6_addr_label(struct net *net,
 135                                                 const struct in6_addr *addr,
 136                                                 int type, int ifindex);
 137
 138 /*
 139  *      multicast prototypes (mcast.c)
 140  */
 141 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 142                              const struct in6_addr *addr);
 143 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 144                              const struct in6_addr *addr);
 145 extern void ipv6_sock_mc_close(struct sock *sk);
 146 extern bool inet6_mc_check(struct sock *sk,
 147                            const struct in6_addr *mc_addr,
 148                            const struct in6_addr *src_addr);
 149
 150 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 151 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 152 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 153 extern void ipv6_mc_up(struct inet6_dev *idev);
 154 extern void ipv6_mc_down(struct inet6_dev *idev);
 155 extern void ipv6_mc_unmap(struct inet6_dev *idev);
 156 extern void ipv6_mc_remap(struct inet6_dev *idev);
 157 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 158 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 159 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 160
 161 extern bool ipv6_chk_mcast_addr(struct net_device *dev,
 162                                 const struct in6_addr *group,
 163                                 const struct in6_addr *src_addr);
 164
 165 /*
 166  * identify MLD packets for MLD filter exceptions
 167  */
 168 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 169 {
 170         struct icmp6hdr *hdr;
 171
 172         if (nexthdr != IPPROTO_ICMPV6 ||
 173             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 174                 return false;
 175
 176         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 177
 178         switch (hdr->icmp6_type) {
 179         case ICMPV6_MGM_QUERY:
 180         case ICMPV6_MGM_REPORT:
 181         case ICMPV6_MGM_REDUCTION:
 182         case ICMPV6_MLD2_REPORT:
 183                 return true;
 184         default:
 185                 break;
 186         }
 187         return false;
 188 }
 189
 190 extern void addrconf_prefix_rcv(struct net_device *dev,
 191                                 u8 *opt, int len, bool sllao);
 192
 193 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table);
 194
 195 /*
 196  *      anycast prototypes (anycast.c)
 197  */
 198 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
 199 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
 200 extern void ipv6_sock_ac_close(struct sock *sk);
 201
 202 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 203 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 204 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 205                                 const struct in6_addr *addr);
 206 extern void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 207
 208
 209 /* Device notifier */
 210 extern int register_inet6addr_notifier(struct notifier_block *nb);
 211 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 212 extern int inet6addr_notifier_call_chain(unsigned long val, void *v);
 213
 214 extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 215                                          struct ipv6_devconf *devconf);
 216
 217 /**
 218  * __in6_dev_get - get inet6_dev pointer from netdevice
 219  * @dev: network device
 220  *
 221  * Caller must hold rcu_read_lock or RTNL, because this function
 222  * does not take a reference on the inet6_dev.
 223  */
 224 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 225 {
 226         return rcu_dereference_rtnl(dev->ip6_ptr);
 227 }
 228
 229 /**
 230  * in6_dev_get - get inet6_dev pointer from netdevice
 231  * @dev: network device
 232  *
 233  * This version can be used in any context, and takes a reference
 234  * on the inet6_dev. Callers must use in6_dev_put() later to
 235  * release this reference.
 236  */
 237 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 238 {
 239         struct inet6_dev *idev;
 240
 241         rcu_read_lock();
 242         idev = rcu_dereference(dev->ip6_ptr);
 243         if (idev)
 244                 atomic_inc(&idev->refcnt);
 245         rcu_read_unlock();
 246         return idev;
 247 }
 248
 249 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 250
 251 static inline void in6_dev_put(struct inet6_dev *idev)
 252 {
 253         if (atomic_dec_and_test(&idev->refcnt))
 254                 in6_dev_finish_destroy(idev);
 255 }
 256
 257 static inline void __in6_dev_put(struct inet6_dev *idev)
 258 {
 259         atomic_dec(&idev->refcnt);
 260 }
 261
 262 static inline void in6_dev_hold(struct inet6_dev *idev)
 263 {
 264         atomic_inc(&idev->refcnt);
 265 }
 266
 267 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 268
 269 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 270 {
 271         if (atomic_dec_and_test(&ifp->refcnt))
 272                 inet6_ifa_finish_destroy(ifp);
 273 }
 274
 275 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 276 {
 277         atomic_dec(&ifp->refcnt);
 278 }
 279
 280 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 281 {
 282         atomic_inc(&ifp->refcnt);
 283 }
 284
 285
 286 /*
 287  *      compute link-local solicited-node multicast address
 288  */
 289
 290 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 291                                              struct in6_addr *solicited)
 292 {
 293         ipv6_addr_set(solicited,
 294                       htonl(0xFF020000), 0,
 295                       htonl(0x1),
 296                       htonl(0xFF000000) | addr->s6_addr32[3]);
 297 }
 298
 299 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 300 {
 301         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 302 }
 303
 304 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 305 {
 306 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 307         __u64 *p = (__u64 *)addr;
 308         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 309 #else
 310         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 311                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 312                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 313 #endif
 314 }
 315
 316 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 317 {
 318 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 319         __u64 *p = (__u64 *)addr;
 320         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 321 #else
 322         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 323                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 324                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 325 #endif
 326 }
 327
 328 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 329 {
 330         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 331 }
 332
 333 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 334 {
 335 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 336         __u64 *p = (__u64 *)addr;
 337         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 338                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 339                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 340 #else
 341         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 342                 addr->s6_addr32[1] |
 343                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 344                 (addr->s6_addr[12] ^ 0xff)) == 0;
 345 #endif
 346 }
 347
 348 #ifdef CONFIG_PROC_FS
 349 extern int if6_proc_init(void);
 350 extern void if6_proc_exit(void);
 351 #endif
 352
 353 #endif