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 inet6_dev *idev,
  90                                                   struct in6_addr *addr,
  91                                                   unsigned char banned_flags);
  92 extern int                      ipv6_get_lladdr(struct net_device *dev,
  93                                                 struct in6_addr *addr,
  94                                                 unsigned char banned_flags);
  95 extern int                      ipv6_rcv_saddr_equal(const struct sock *sk,
  96                                                     const struct sock *sk2);
  97 extern void                     addrconf_join_solict(struct net_device *dev,
  98                                         const struct in6_addr *addr);
  99 extern void                     addrconf_leave_solict(struct inet6_dev *idev,
 100                                         const struct in6_addr *addr);
 101
 102 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 103                                                    unsigned int unit)
 104 {
 105         if (timeout == 0xffffffff)
 106                 return ~0UL;
 107
 108         /*
 109          * Avoid arithmetic overflow.
 110          * Assuming unit is constant and non-zero, this "if" statement
 111          * will go away on 64bit archs.
 112          */
 113         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 114                 return LONG_MAX / unit;
 115
 116         return timeout;
 117 }
 118
 119 static inline int addrconf_finite_timeout(unsigned long timeout)
 120 {
 121         return ~timeout;
 122 }
 123
 124 /*
 125  *      IPv6 Address Label subsystem (addrlabel.c)
 126  */
 127 extern int                      ipv6_addr_label_init(void);
 128 extern void                     ipv6_addr_label_cleanup(void);
 129 extern void                     ipv6_addr_label_rtnl_register(void);
 130 extern u32                      ipv6_addr_label(struct net *net,
 131                                                 const struct in6_addr *addr,
 132                                                 int type, int ifindex);
 133
 134 /*
 135  *      multicast prototypes (mcast.c)
 136  */
 137 extern int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 138                              const struct in6_addr *addr);
 139 extern int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 140                              const struct in6_addr *addr);
 141 extern void ipv6_sock_mc_close(struct sock *sk);
 142 extern bool inet6_mc_check(struct sock *sk,
 143                            const struct in6_addr *mc_addr,
 144                            const struct in6_addr *src_addr);
 145
 146 extern int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 147 extern int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 148 extern int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 149 extern void ipv6_mc_up(struct inet6_dev *idev);
 150 extern void ipv6_mc_down(struct inet6_dev *idev);
 151 extern void ipv6_mc_unmap(struct inet6_dev *idev);
 152 extern void ipv6_mc_remap(struct inet6_dev *idev);
 153 extern void ipv6_mc_init_dev(struct inet6_dev *idev);
 154 extern void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 155 extern void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 156
 157 extern bool ipv6_chk_mcast_addr(struct net_device *dev,
 158                                 const struct in6_addr *group,
 159                                 const struct in6_addr *src_addr);
 160
 161 extern void ipv6_mc_dad_complete(struct inet6_dev *idev);
 162 /*
 163  * identify MLD packets for MLD filter exceptions
 164  */
 165 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 166 {
 167         struct icmp6hdr *hdr;
 168
 169         if (nexthdr != IPPROTO_ICMPV6 ||
 170             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 171                 return false;
 172
 173         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 174
 175         switch (hdr->icmp6_type) {
 176         case ICMPV6_MGM_QUERY:
 177         case ICMPV6_MGM_REPORT:
 178         case ICMPV6_MGM_REDUCTION:
 179         case ICMPV6_MLD2_REPORT:
 180                 return true;
 181         default:
 182                 break;
 183         }
 184         return false;
 185 }
 186
 187 extern void addrconf_prefix_rcv(struct net_device *dev,
 188                                 u8 *opt, int len, bool sllao);
 189
 190 /*
 191  *      anycast prototypes (anycast.c)
 192  */
 193 extern int ipv6_sock_ac_join(struct sock *sk,int ifindex, const struct in6_addr *addr);
 194 extern int ipv6_sock_ac_drop(struct sock *sk,int ifindex, const struct in6_addr *addr);
 195 extern void ipv6_sock_ac_close(struct sock *sk);
 196
 197 extern int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 198 extern int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 199 extern bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 200                                 const struct in6_addr *addr);
 201
 202
 203 /* Device notifier */
 204 extern int register_inet6addr_notifier(struct notifier_block *nb);
 205 extern int unregister_inet6addr_notifier(struct notifier_block *nb);
 206 extern int inet6addr_notifier_call_chain(unsigned long val, void *v);
 207
 208 extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 209                                          struct ipv6_devconf *devconf);
 210
 211 /**
 212  * __in6_dev_get - get inet6_dev pointer from netdevice
 213  * @dev: network device
 214  *
 215  * Caller must hold rcu_read_lock or RTNL, because this function
 216  * does not take a reference on the inet6_dev.
 217  */
 218 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 219 {
 220         return rcu_dereference_rtnl(dev->ip6_ptr);
 221 }
 222
 223 /**
 224  * in6_dev_get - get inet6_dev pointer from netdevice
 225  * @dev: network device
 226  *
 227  * This version can be used in any context, and takes a reference
 228  * on the inet6_dev. Callers must use in6_dev_put() later to
 229  * release this reference.
 230  */
 231 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 232 {
 233         struct inet6_dev *idev;
 234
 235         rcu_read_lock();
 236         idev = rcu_dereference(dev->ip6_ptr);
 237         if (idev)
 238                 atomic_inc(&idev->refcnt);
 239         rcu_read_unlock();
 240         return idev;
 241 }
 242
 243 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 244
 245 static inline void in6_dev_put(struct inet6_dev *idev)
 246 {
 247         if (atomic_dec_and_test(&idev->refcnt))
 248                 in6_dev_finish_destroy(idev);
 249 }
 250
 251 static inline void __in6_dev_put(struct inet6_dev *idev)
 252 {
 253         atomic_dec(&idev->refcnt);
 254 }
 255
 256 static inline void in6_dev_hold(struct inet6_dev *idev)
 257 {
 258         atomic_inc(&idev->refcnt);
 259 }
 260
 261 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 262
 263 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 264 {
 265         if (atomic_dec_and_test(&ifp->refcnt))
 266                 inet6_ifa_finish_destroy(ifp);
 267 }
 268
 269 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 270 {
 271         atomic_dec(&ifp->refcnt);
 272 }
 273
 274 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 275 {
 276         atomic_inc(&ifp->refcnt);
 277 }
 278
 279
 280 /*
 281  *      compute link-local solicited-node multicast address
 282  */
 283
 284 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 285                                              struct in6_addr *solicited)
 286 {
 287         ipv6_addr_set(solicited,
 288                       htonl(0xFF020000), 0,
 289                       htonl(0x1),
 290                       htonl(0xFF000000) | addr->s6_addr32[3]);
 291 }
 292
 293 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 294 {
 295         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 296 }
 297
 298 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 299 {
 300 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 301         __u64 *p = (__u64 *)addr;
 302         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 303 #else
 304         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 305                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 306                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 307 #endif
 308 }
 309
 310 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 311 {
 312 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 313         __u64 *p = (__u64 *)addr;
 314         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 315 #else
 316         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 317                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 318                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 319 #endif
 320 }
 321
 322 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 323 {
 324         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 325 }
 326
 327 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 328 {
 329 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 330         __u64 *p = (__u64 *)addr;
 331         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 332                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 333                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 334 #else
 335         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 336                 addr->s6_addr32[1] |
 337                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 338                 (addr->s6_addr[12] ^ 0xff)) == 0;
 339 #endif
 340 }
 341
 342 #ifdef CONFIG_PROC_FS
 343 extern int if6_proc_init(void);
 344 extern void if6_proc_exit(void);
 345 #endif
 346
 347 #endif