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                                               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
 203 extern void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 204                                          struct ipv6_devconf *devconf);
 205
 206 /**
 207  * __in6_dev_get - get inet6_dev pointer from netdevice
 208  * @dev: network device
 209  *
 210  * Caller must hold rcu_read_lock or RTNL, because this function
 211  * does not take a reference on the inet6_dev.
 212  */
 213 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 214 {
 215         return rcu_dereference_rtnl(dev->ip6_ptr);
 216 }
 217
 218 /**
 219  * in6_dev_get - get inet6_dev pointer from netdevice
 220  * @dev: network device
 221  *
 222  * This version can be used in any context, and takes a reference
 223  * on the inet6_dev. Callers must use in6_dev_put() later to
 224  * release this reference.
 225  */
 226 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 227 {
 228         struct inet6_dev *idev;
 229
 230         rcu_read_lock();
 231         idev = rcu_dereference(dev->ip6_ptr);
 232         if (idev)
 233                 atomic_inc(&idev->refcnt);
 234         rcu_read_unlock();
 235         return idev;
 236 }
 237
 238 extern void in6_dev_finish_destroy(struct inet6_dev *idev);
 239
 240 static inline void in6_dev_put(struct inet6_dev *idev)
 241 {
 242         if (atomic_dec_and_test(&idev->refcnt))
 243                 in6_dev_finish_destroy(idev);
 244 }
 245
 246 static inline void __in6_dev_put(struct inet6_dev *idev)
 247 {
 248         atomic_dec(&idev->refcnt);
 249 }
 250
 251 static inline void in6_dev_hold(struct inet6_dev *idev)
 252 {
 253         atomic_inc(&idev->refcnt);
 254 }
 255
 256 extern void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 257
 258 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 259 {
 260         if (atomic_dec_and_test(&ifp->refcnt))
 261                 inet6_ifa_finish_destroy(ifp);
 262 }
 263
 264 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 265 {
 266         atomic_dec(&ifp->refcnt);
 267 }
 268
 269 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 270 {
 271         atomic_inc(&ifp->refcnt);
 272 }
 273
 274
 275 /*
 276  *      compute link-local solicited-node multicast address
 277  */
 278
 279 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 280                                              struct in6_addr *solicited)
 281 {
 282         ipv6_addr_set(solicited,
 283                       htonl(0xFF020000), 0,
 284                       htonl(0x1),
 285                       htonl(0xFF000000) | addr->s6_addr32[3]);
 286 }
 287
 288 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 289 {
 290         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 291 }
 292
 293 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 294 {
 295 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 296         __u64 *p = (__u64 *)addr;
 297         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 298 #else
 299         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 300                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 301                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 302 #endif
 303 }
 304
 305 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 306 {
 307 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 308         __u64 *p = (__u64 *)addr;
 309         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 310 #else
 311         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 312                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 313                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 314 #endif
 315 }
 316
 317 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 318 {
 319         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 320 }
 321
 322 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 323 {
 324 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 325         __u64 *p = (__u64 *)addr;
 326         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 327                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 328                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 329 #else
 330         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 331                 addr->s6_addr32[1] |
 332                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 333                 (addr->s6_addr[12] ^ 0xff)) == 0;
 334 #endif
 335 }
 336
 337 #ifdef CONFIG_PROC_FS
 338 extern int if6_proc_init(void);
 339 extern void if6_proc_exit(void);
 340 #endif
 341
 342 #endif