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