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 int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 107 {
 108         if (dev->addr_len != ETH_ALEN)
 109                 return -1;
 110         memcpy(eui, dev->dev_addr, 3);
 111         memcpy(eui + 5, dev->dev_addr + 3, 3);
 112
 113         /*
 114          * The zSeries OSA network cards can be shared among various
 115          * OS instances, but the OSA cards have only one MAC address.
 116          * This leads to duplicate address conflicts in conjunction
 117          * with IPv6 if more than one instance uses the same card.
 118          *
 119          * The driver for these cards can deliver a unique 16-bit
 120          * identifier for each instance sharing the same card.  It is
 121          * placed instead of 0xFFFE in the interface identifier.  The
 122          * "u" bit of the interface identifier is not inverted in this
 123          * case.  Hence the resulting interface identifier has local
 124          * scope according to RFC2373.
 125          */
 126         if (dev->dev_id) {
 127                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 128                 eui[4] = dev->dev_id & 0xFF;
 129         } else {
 130                 eui[3] = 0xFF;
 131                 eui[4] = 0xFE;
 132                 eui[0] ^= 2;
 133         }
 134         return 0;
 135 }
 136
 137 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 138                                                    unsigned int unit)
 139 {
 140         if (timeout == 0xffffffff)
 141                 return ~0UL;
 142
 143         /*
 144          * Avoid arithmetic overflow.
 145          * Assuming unit is constant and non-zero, this "if" statement
 146          * will go away on 64bit archs.
 147          */
 148         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 149                 return LONG_MAX / unit;
 150
 151         return timeout;
 152 }
 153
 154 static inline int addrconf_finite_timeout(unsigned long timeout)
 155 {
 156         return ~timeout;
 157 }
 158
 159 /*
 160  *      IPv6 Address Label subsystem (addrlabel.c)
 161  */
 162 int ipv6_addr_label_init(void);
 163 void ipv6_addr_label_cleanup(void);
 164 void ipv6_addr_label_rtnl_register(void);
 165 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 166                     int type, int ifindex);
 167
 168 /*
 169  *      multicast prototypes (mcast.c)
 170  */
 171 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 172                       const struct in6_addr *addr);
 173 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 174                       const struct in6_addr *addr);
 175 void __ipv6_sock_mc_close(struct sock *sk);
 176 void ipv6_sock_mc_close(struct sock *sk);
 177 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 178                     const struct in6_addr *src_addr);
 179
 180 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 181 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 182 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 183 void ipv6_mc_up(struct inet6_dev *idev);
 184 void ipv6_mc_down(struct inet6_dev *idev);
 185 void ipv6_mc_unmap(struct inet6_dev *idev);
 186 void ipv6_mc_remap(struct inet6_dev *idev);
 187 void ipv6_mc_init_dev(struct inet6_dev *idev);
 188 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 189 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 190 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 191
 192 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 193                          const struct in6_addr *src_addr);
 194
 195 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 196
 197 /* A stub used by vxlan module. This is ugly, ideally these
 198  * symbols should be built into the core kernel.
 199  */
 200 struct ipv6_stub {
 201         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 202                                  const struct in6_addr *addr);
 203         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 204                                  const struct in6_addr *addr);
 205         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 206                                struct dst_entry **dst, struct flowi6 *fl6);
 207         void (*udpv6_encap_enable)(void);
 208         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 209                               const struct in6_addr *solicited_addr,
 210                               bool router, bool solicited, bool override, bool inc_opt);
 211         struct neigh_table *nd_tbl;
 212 };
 213 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 214
 215 /*
 216  * identify MLD packets for MLD filter exceptions
 217  */
 218 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 219 {
 220         struct icmp6hdr *hdr;
 221
 222         if (nexthdr != IPPROTO_ICMPV6 ||
 223             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 224                 return false;
 225
 226         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 227
 228         switch (hdr->icmp6_type) {
 229         case ICMPV6_MGM_QUERY:
 230         case ICMPV6_MGM_REPORT:
 231         case ICMPV6_MGM_REDUCTION:
 232         case ICMPV6_MLD2_REPORT:
 233                 return true;
 234         default:
 235                 break;
 236         }
 237         return false;
 238 }
 239
 240 void addrconf_prefix_rcv(struct net_device *dev,
 241                          u8 *opt, int len, bool sllao);
 242
 243 /*
 244  *      anycast prototypes (anycast.c)
 245  */
 246 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 247                       const struct in6_addr *addr);
 248 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 249                       const struct in6_addr *addr);
 250 void ipv6_sock_ac_close(struct sock *sk);
 251
 252 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 253 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 254 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 255 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 256                          const struct in6_addr *addr);
 257 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 258                              const struct in6_addr *addr);
 259
 260 /* Device notifier */
 261 int register_inet6addr_notifier(struct notifier_block *nb);
 262 int unregister_inet6addr_notifier(struct notifier_block *nb);
 263 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 264
 265 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 266                                   struct ipv6_devconf *devconf);
 267
 268 /**
 269  * __in6_dev_get - get inet6_dev pointer from netdevice
 270  * @dev: network device
 271  *
 272  * Caller must hold rcu_read_lock or RTNL, because this function
 273  * does not take a reference on the inet6_dev.
 274  */
 275 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 276 {
 277         return rcu_dereference_rtnl(dev->ip6_ptr);
 278 }
 279
 280 /**
 281  * in6_dev_get - get inet6_dev pointer from netdevice
 282  * @dev: network device
 283  *
 284  * This version can be used in any context, and takes a reference
 285  * on the inet6_dev. Callers must use in6_dev_put() later to
 286  * release this reference.
 287  */
 288 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 289 {
 290         struct inet6_dev *idev;
 291
 292         rcu_read_lock();
 293         idev = rcu_dereference(dev->ip6_ptr);
 294         if (idev)
 295                 atomic_inc(&idev->refcnt);
 296         rcu_read_unlock();
 297         return idev;
 298 }
 299
 300 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 301 {
 302         struct inet6_dev *idev = __in6_dev_get(dev);
 303
 304         return idev ? idev->nd_parms : NULL;
 305 }
 306
 307 void in6_dev_finish_destroy(struct inet6_dev *idev);
 308
 309 static inline void in6_dev_put(struct inet6_dev *idev)
 310 {
 311         if (atomic_dec_and_test(&idev->refcnt))
 312                 in6_dev_finish_destroy(idev);
 313 }
 314
 315 static inline void __in6_dev_put(struct inet6_dev *idev)
 316 {
 317         atomic_dec(&idev->refcnt);
 318 }
 319
 320 static inline void in6_dev_hold(struct inet6_dev *idev)
 321 {
 322         atomic_inc(&idev->refcnt);
 323 }
 324
 325 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 326
 327 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 328 {
 329         if (atomic_dec_and_test(&ifp->refcnt))
 330                 inet6_ifa_finish_destroy(ifp);
 331 }
 332
 333 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 334 {
 335         atomic_dec(&ifp->refcnt);
 336 }
 337
 338 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 339 {
 340         atomic_inc(&ifp->refcnt);
 341 }
 342
 343
 344 /*
 345  *      compute link-local solicited-node multicast address
 346  */
 347
 348 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 349                                              struct in6_addr *solicited)
 350 {
 351         ipv6_addr_set(solicited,
 352                       htonl(0xFF020000), 0,
 353                       htonl(0x1),
 354                       htonl(0xFF000000) | addr->s6_addr32[3]);
 355 }
 356
 357 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 358 {
 359 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 360         __be64 *p = (__be64 *)addr;
 361         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 362 #else
 363         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 364                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 365                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 366 #endif
 367 }
 368
 369 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 370 {
 371 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 372         __be64 *p = (__be64 *)addr;
 373         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 374 #else
 375         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 376                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 377                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 378 #endif
 379 }
 380
 381 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 382 {
 383         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 384 }
 385
 386 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 387 {
 388 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 389         __be64 *p = (__be64 *)addr;
 390         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 391                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 392                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 393 #else
 394         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 395                 addr->s6_addr32[1] |
 396                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 397                 (addr->s6_addr[12] ^ 0xff)) == 0;
 398 #endif
 399 }
 400
 401 #ifdef CONFIG_PROC_FS
 402 int if6_proc_init(void);
 403 void if6_proc_exit(void);
 404 #endif
 405
 406 #endif