include/net/addrconf.h

   1 #ifndef _ADDRCONF_H
   2 #define _ADDRCONF_H
   3
   4 #define MAX_RTR_SOLICITATIONS           -1              /* unlimited */
   5 #define RTR_SOLICITATION_INTERVAL       (4*HZ)
   6 #define RTR_SOLICITATION_MAX_INTERVAL   (3600*HZ)       /* 1 hour */
   7
   8 #define MIN_VALID_LIFETIME              (2*3600)        /* 2 hours */
   9
  10 #define TEMP_VALID_LIFETIME             (7*86400)
  11 #define TEMP_PREFERRED_LIFETIME         (86400)
  12 #define REGEN_MAX_RETRY                 (3)
  13 #define MAX_DESYNC_FACTOR               (600)
  14
  15 #define ADDR_CHECK_FREQUENCY            (120*HZ)
  16
  17 #define IPV6_MAX_ADDRESSES              16
  18
  19 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
  20 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
  21 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
  22
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25
  26 struct prefix_info {
  27         __u8                    type;
  28         __u8                    length;
  29         __u8                    prefix_len;
  30
  31 #if defined(__BIG_ENDIAN_BITFIELD)
  32         __u8                    onlink : 1,
  33                                 autoconf : 1,
  34                                 reserved : 6;
  35 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  36         __u8                    reserved : 6,
  37                                 autoconf : 1,
  38                                 onlink : 1;
  39 #else
  40 #error "Please fix <asm/byteorder.h>"
  41 #endif
  42         __be32                  valid;
  43         __be32                  prefered;
  44         __be32                  reserved2;
  45
  46         struct in6_addr         prefix;
  47 };
  48
  49
  50 #include <linux/netdevice.h>
  51 #include <net/if_inet6.h>
  52 #include <net/ipv6.h>
  53
  54 #define IN6_ADDR_HSIZE_SHIFT    4
  55 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  56
  57 int addrconf_init(void);
  58 void addrconf_cleanup(void);
  59
  60 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  61 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  62 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  63
  64 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  65                   const struct net_device *dev, int strict);
  66 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  67                             const struct net_device *dev, int strict,
  68                             u32 banned_flags);
  69
  70 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  71 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  72 #endif
  73
  74 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  75                                    const unsigned int prefix_len,
  76                                    struct net_device *dev);
  77
  78 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  79
  80 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  81                                      const struct in6_addr *addr,
  82                                      struct net_device *dev, int strict);
  83
  84 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  85                        const struct in6_addr *daddr, unsigned int srcprefs,
  86                        struct in6_addr *saddr);
  87 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  88                       u32 banned_flags);
  89 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  90                     u32 banned_flags);
  91 int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  92                          bool match_wildcard);
  93 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  94 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
  95
  96 void addrconf_add_linklocal(struct inet6_dev *idev,
  97                             const struct in6_addr *addr, u32 flags);
  98
  99 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 100                                  const struct prefix_info *pinfo,
 101                                  struct inet6_dev *in6_dev,
 102                                  const struct in6_addr *addr, int addr_type,
 103                                  u32 addr_flags, bool sllao, bool tokenized,
 104                                  __u32 valid_lft, u32 prefered_lft);
 105
 106 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 107 {
 108         memcpy(eui, addr, 3);
 109         eui[3] = 0xFF;
 110         eui[4] = 0xFE;
 111         memcpy(eui + 5, addr + 3, 3);
 112 }
 113
 114 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 115 {
 116         addrconf_addr_eui48_base(eui, addr);
 117         eui[0] ^= 2;
 118 }
 119
 120 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 121 {
 122         if (dev->addr_len != ETH_ALEN)
 123                 return -1;
 124
 125         /*
 126          * The zSeries OSA network cards can be shared among various
 127          * OS instances, but the OSA cards have only one MAC address.
 128          * This leads to duplicate address conflicts in conjunction
 129          * with IPv6 if more than one instance uses the same card.
 130          *
 131          * The driver for these cards can deliver a unique 16-bit
 132          * identifier for each instance sharing the same card.  It is
 133          * placed instead of 0xFFFE in the interface identifier.  The
 134          * "u" bit of the interface identifier is not inverted in this
 135          * case.  Hence the resulting interface identifier has local
 136          * scope according to RFC2373.
 137          */
 138
 139         addrconf_addr_eui48_base(eui, dev->dev_addr);
 140
 141         if (dev->dev_id) {
 142                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 143                 eui[4] = dev->dev_id & 0xFF;
 144         } else {
 145                 eui[0] ^= 2;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 152                                                    unsigned int unit)
 153 {
 154         if (timeout == 0xffffffff)
 155                 return ~0UL;
 156
 157         /*
 158          * Avoid arithmetic overflow.
 159          * Assuming unit is constant and non-zero, this "if" statement
 160          * will go away on 64bit archs.
 161          */
 162         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 163                 return LONG_MAX / unit;
 164
 165         return timeout;
 166 }
 167
 168 static inline int addrconf_finite_timeout(unsigned long timeout)
 169 {
 170         return ~timeout;
 171 }
 172
 173 /*
 174  *      IPv6 Address Label subsystem (addrlabel.c)
 175  */
 176 int ipv6_addr_label_init(void);
 177 void ipv6_addr_label_cleanup(void);
 178 void ipv6_addr_label_rtnl_register(void);
 179 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 180                     int type, int ifindex);
 181
 182 /*
 183  *      multicast prototypes (mcast.c)
 184  */
 185 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 186                       const struct in6_addr *addr);
 187 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 188                       const struct in6_addr *addr);
 189 void __ipv6_sock_mc_close(struct sock *sk);
 190 void ipv6_sock_mc_close(struct sock *sk);
 191 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 192                     const struct in6_addr *src_addr);
 193
 194 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 195 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 196 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 197 void ipv6_mc_up(struct inet6_dev *idev);
 198 void ipv6_mc_down(struct inet6_dev *idev);
 199 void ipv6_mc_unmap(struct inet6_dev *idev);
 200 void ipv6_mc_remap(struct inet6_dev *idev);
 201 void ipv6_mc_init_dev(struct inet6_dev *idev);
 202 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 203 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 204 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 205
 206 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 207                          const struct in6_addr *src_addr);
 208
 209 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 210
 211 /* A stub used by vxlan module. This is ugly, ideally these
 212  * symbols should be built into the core kernel.
 213  */
 214 struct ipv6_stub {
 215         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 216                                  const struct in6_addr *addr);
 217         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 218                                  const struct in6_addr *addr);
 219         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 220                                struct dst_entry **dst, struct flowi6 *fl6);
 221         void (*udpv6_encap_enable)(void);
 222         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 223                               const struct in6_addr *solicited_addr,
 224                               bool router, bool solicited, bool override, bool inc_opt);
 225         struct neigh_table *nd_tbl;
 226 };
 227 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 228
 229 /*
 230  * identify MLD packets for MLD filter exceptions
 231  */
 232 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 233 {
 234         struct icmp6hdr *hdr;
 235
 236         if (nexthdr != IPPROTO_ICMPV6 ||
 237             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 238                 return false;
 239
 240         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 241
 242         switch (hdr->icmp6_type) {
 243         case ICMPV6_MGM_QUERY:
 244         case ICMPV6_MGM_REPORT:
 245         case ICMPV6_MGM_REDUCTION:
 246         case ICMPV6_MLD2_REPORT:
 247                 return true;
 248         default:
 249                 break;
 250         }
 251         return false;
 252 }
 253
 254 void addrconf_prefix_rcv(struct net_device *dev,
 255                          u8 *opt, int len, bool sllao);
 256
 257 /*
 258  *      anycast prototypes (anycast.c)
 259  */
 260 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 261                       const struct in6_addr *addr);
 262 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 263                       const struct in6_addr *addr);
 264 void ipv6_sock_ac_close(struct sock *sk);
 265
 266 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 267 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 268 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 269 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 270                          const struct in6_addr *addr);
 271 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 272                              const struct in6_addr *addr);
 273
 274 /* Device notifier */
 275 int register_inet6addr_notifier(struct notifier_block *nb);
 276 int unregister_inet6addr_notifier(struct notifier_block *nb);
 277 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 278
 279 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 280                                   int ifindex, struct ipv6_devconf *devconf);
 281
 282 /**
 283  * __in6_dev_get - get inet6_dev pointer from netdevice
 284  * @dev: network device
 285  *
 286  * Caller must hold rcu_read_lock or RTNL, because this function
 287  * does not take a reference on the inet6_dev.
 288  */
 289 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 290 {
 291         return rcu_dereference_rtnl(dev->ip6_ptr);
 292 }
 293
 294 /**
 295  * in6_dev_get - get inet6_dev pointer from netdevice
 296  * @dev: network device
 297  *
 298  * This version can be used in any context, and takes a reference
 299  * on the inet6_dev. Callers must use in6_dev_put() later to
 300  * release this reference.
 301  */
 302 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 303 {
 304         struct inet6_dev *idev;
 305
 306         rcu_read_lock();
 307         idev = rcu_dereference(dev->ip6_ptr);
 308         if (idev)
 309                 atomic_inc(&idev->refcnt);
 310         rcu_read_unlock();
 311         return idev;
 312 }
 313
 314 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 315 {
 316         struct inet6_dev *idev = __in6_dev_get(dev);
 317
 318         return idev ? idev->nd_parms : NULL;
 319 }
 320
 321 void in6_dev_finish_destroy(struct inet6_dev *idev);
 322
 323 static inline void in6_dev_put(struct inet6_dev *idev)
 324 {
 325         if (atomic_dec_and_test(&idev->refcnt))
 326                 in6_dev_finish_destroy(idev);
 327 }
 328
 329 static inline void __in6_dev_put(struct inet6_dev *idev)
 330 {
 331         atomic_dec(&idev->refcnt);
 332 }
 333
 334 static inline void in6_dev_hold(struct inet6_dev *idev)
 335 {
 336         atomic_inc(&idev->refcnt);
 337 }
 338
 339 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 340
 341 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 342 {
 343         if (atomic_dec_and_test(&ifp->refcnt))
 344                 inet6_ifa_finish_destroy(ifp);
 345 }
 346
 347 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 348 {
 349         atomic_dec(&ifp->refcnt);
 350 }
 351
 352 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 353 {
 354         atomic_inc(&ifp->refcnt);
 355 }
 356
 357
 358 /*
 359  *      compute link-local solicited-node multicast address
 360  */
 361
 362 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 363                                              struct in6_addr *solicited)
 364 {
 365         ipv6_addr_set(solicited,
 366                       htonl(0xFF020000), 0,
 367                       htonl(0x1),
 368                       htonl(0xFF000000) | addr->s6_addr32[3]);
 369 }
 370
 371 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 372 {
 373 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 374         __be64 *p = (__be64 *)addr;
 375         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 376 #else
 377         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 378                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 379                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 380 #endif
 381 }
 382
 383 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 384 {
 385 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 386         __be64 *p = (__be64 *)addr;
 387         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 388 #else
 389         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 390                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 391                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 392 #endif
 393 }
 394
 395 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 396 {
 397         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 398 }
 399
 400 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 401 {
 402 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 403         __be64 *p = (__be64 *)addr;
 404         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 405                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 406                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 407 #else
 408         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 409                 addr->s6_addr32[1] |
 410                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 411                 (addr->s6_addr[12] ^ 0xff)) == 0;
 412 #endif
 413 }
 414
 415 #ifdef CONFIG_PROC_FS
 416 int if6_proc_init(void);
 417 void if6_proc_exit(void);
 418 #endif
 419
 420 #endif