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 #define ADDRCONF_NOTIFY_PRIORITY        0
  24
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27
  28 struct prefix_info {
  29         __u8                    type;
  30         __u8                    length;
  31         __u8                    prefix_len;
  32
  33 #if defined(__BIG_ENDIAN_BITFIELD)
  34         __u8                    onlink : 1,
  35                                 autoconf : 1,
  36                                 reserved : 6;
  37 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  38         __u8                    reserved : 6,
  39                                 autoconf : 1,
  40                                 onlink : 1;
  41 #else
  42 #error "Please fix <asm/byteorder.h>"
  43 #endif
  44         __be32                  valid;
  45         __be32                  prefered;
  46         __be32                  reserved2;
  47
  48         struct in6_addr         prefix;
  49 };
  50
  51 #include <linux/netdevice.h>
  52 #include <net/if_inet6.h>
  53 #include <net/ipv6.h>
  54
  55 struct in6_validator_info {
  56         struct in6_addr         i6vi_addr;
  57         struct inet6_dev        *i6vi_dev;
  58 };
  59
  60 #define IN6_ADDR_HSIZE_SHIFT    4
  61 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  62
  63 int addrconf_init(void);
  64 void addrconf_cleanup(void);
  65
  66 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  67 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  68 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  69
  70 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  71                   const struct net_device *dev, int strict);
  72 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  73                             const struct net_device *dev, int strict,
  74                             u32 banned_flags);
  75
  76 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  77 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  78 #endif
  79
  80 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  81                                    const unsigned int prefix_len,
  82                                    struct net_device *dev);
  83
  84 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  85
  86 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  87                                      const struct in6_addr *addr,
  88                                      struct net_device *dev, int strict);
  89
  90 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  91                        const struct in6_addr *daddr, unsigned int srcprefs,
  92                        struct in6_addr *saddr);
  93 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  94                       u32 banned_flags);
  95 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  96                     u32 banned_flags);
  97 int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  98                          bool match_wildcard);
  99 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 100 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 101
 102 void addrconf_add_linklocal(struct inet6_dev *idev,
 103                             const struct in6_addr *addr, u32 flags);
 104
 105 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 106                                  const struct prefix_info *pinfo,
 107                                  struct inet6_dev *in6_dev,
 108                                  const struct in6_addr *addr, int addr_type,
 109                                  u32 addr_flags, bool sllao, bool tokenized,
 110                                  __u32 valid_lft, u32 prefered_lft);
 111
 112 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 113 {
 114         memcpy(eui, addr, 3);
 115         eui[3] = 0xFF;
 116         eui[4] = 0xFE;
 117         memcpy(eui + 5, addr + 3, 3);
 118 }
 119
 120 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 121 {
 122         addrconf_addr_eui48_base(eui, addr);
 123         eui[0] ^= 2;
 124 }
 125
 126 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 127 {
 128         if (dev->addr_len != ETH_ALEN)
 129                 return -1;
 130
 131         /*
 132          * The zSeries OSA network cards can be shared among various
 133          * OS instances, but the OSA cards have only one MAC address.
 134          * This leads to duplicate address conflicts in conjunction
 135          * with IPv6 if more than one instance uses the same card.
 136          *
 137          * The driver for these cards can deliver a unique 16-bit
 138          * identifier for each instance sharing the same card.  It is
 139          * placed instead of 0xFFFE in the interface identifier.  The
 140          * "u" bit of the interface identifier is not inverted in this
 141          * case.  Hence the resulting interface identifier has local
 142          * scope according to RFC2373.
 143          */
 144
 145         addrconf_addr_eui48_base(eui, dev->dev_addr);
 146
 147         if (dev->dev_id) {
 148                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 149                 eui[4] = dev->dev_id & 0xFF;
 150         } else {
 151                 eui[0] ^= 2;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 158                                                    unsigned int unit)
 159 {
 160         if (timeout == 0xffffffff)
 161                 return ~0UL;
 162
 163         /*
 164          * Avoid arithmetic overflow.
 165          * Assuming unit is constant and non-zero, this "if" statement
 166          * will go away on 64bit archs.
 167          */
 168         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 169                 return LONG_MAX / unit;
 170
 171         return timeout;
 172 }
 173
 174 static inline int addrconf_finite_timeout(unsigned long timeout)
 175 {
 176         return ~timeout;
 177 }
 178
 179 /*
 180  *      IPv6 Address Label subsystem (addrlabel.c)
 181  */
 182 int ipv6_addr_label_init(void);
 183 void ipv6_addr_label_cleanup(void);
 184 void ipv6_addr_label_rtnl_register(void);
 185 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 186                     int type, int ifindex);
 187
 188 /*
 189  *      multicast prototypes (mcast.c)
 190  */
 191 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 192                       const struct in6_addr *addr);
 193 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 194                       const struct in6_addr *addr);
 195 void __ipv6_sock_mc_close(struct sock *sk);
 196 void ipv6_sock_mc_close(struct sock *sk);
 197 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 198                     const struct in6_addr *src_addr);
 199
 200 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 201 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 202 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 203 void ipv6_mc_up(struct inet6_dev *idev);
 204 void ipv6_mc_down(struct inet6_dev *idev);
 205 void ipv6_mc_unmap(struct inet6_dev *idev);
 206 void ipv6_mc_remap(struct inet6_dev *idev);
 207 void ipv6_mc_init_dev(struct inet6_dev *idev);
 208 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 209 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 210 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 211
 212 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 213                          const struct in6_addr *src_addr);
 214
 215 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 216
 217 /* A stub used by vxlan module. This is ugly, ideally these
 218  * symbols should be built into the core kernel.
 219  */
 220 struct ipv6_stub {
 221         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 222                                  const struct in6_addr *addr);
 223         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 224                                  const struct in6_addr *addr);
 225         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 226                                struct dst_entry **dst, struct flowi6 *fl6);
 227         void (*udpv6_encap_enable)(void);
 228         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 229                               const struct in6_addr *solicited_addr,
 230                               bool router, bool solicited, bool override, bool inc_opt);
 231         struct neigh_table *nd_tbl;
 232 };
 233 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 234
 235 /*
 236  * identify MLD packets for MLD filter exceptions
 237  */
 238 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 239 {
 240         struct icmp6hdr *hdr;
 241
 242         if (nexthdr != IPPROTO_ICMPV6 ||
 243             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 244                 return false;
 245
 246         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 247
 248         switch (hdr->icmp6_type) {
 249         case ICMPV6_MGM_QUERY:
 250         case ICMPV6_MGM_REPORT:
 251         case ICMPV6_MGM_REDUCTION:
 252         case ICMPV6_MLD2_REPORT:
 253                 return true;
 254         default:
 255                 break;
 256         }
 257         return false;
 258 }
 259
 260 void addrconf_prefix_rcv(struct net_device *dev,
 261                          u8 *opt, int len, bool sllao);
 262
 263 /*
 264  *      anycast prototypes (anycast.c)
 265  */
 266 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 267                       const struct in6_addr *addr);
 268 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 269                       const struct in6_addr *addr);
 270 void ipv6_sock_ac_close(struct sock *sk);
 271
 272 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 273 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 274 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 275 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 276                          const struct in6_addr *addr);
 277 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 278                              const struct in6_addr *addr);
 279
 280 /* Device notifier */
 281 int register_inet6addr_notifier(struct notifier_block *nb);
 282 int unregister_inet6addr_notifier(struct notifier_block *nb);
 283 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 284
 285 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 286 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 287 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 288
 289 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 290                                   int ifindex, struct ipv6_devconf *devconf);
 291
 292 /**
 293  * __in6_dev_get - get inet6_dev pointer from netdevice
 294  * @dev: network device
 295  *
 296  * Caller must hold rcu_read_lock or RTNL, because this function
 297  * does not take a reference on the inet6_dev.
 298  */
 299 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 300 {
 301         return rcu_dereference_rtnl(dev->ip6_ptr);
 302 }
 303
 304 /**
 305  * in6_dev_get - get inet6_dev pointer from netdevice
 306  * @dev: network device
 307  *
 308  * This version can be used in any context, and takes a reference
 309  * on the inet6_dev. Callers must use in6_dev_put() later to
 310  * release this reference.
 311  */
 312 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 313 {
 314         struct inet6_dev *idev;
 315
 316         rcu_read_lock();
 317         idev = rcu_dereference(dev->ip6_ptr);
 318         if (idev)
 319                 refcount_inc(&idev->refcnt);
 320         rcu_read_unlock();
 321         return idev;
 322 }
 323
 324 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 325 {
 326         struct inet6_dev *idev = __in6_dev_get(dev);
 327
 328         return idev ? idev->nd_parms : NULL;
 329 }
 330
 331 void in6_dev_finish_destroy(struct inet6_dev *idev);
 332
 333 static inline void in6_dev_put(struct inet6_dev *idev)
 334 {
 335         if (refcount_dec_and_test(&idev->refcnt))
 336                 in6_dev_finish_destroy(idev);
 337 }
 338
 339 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 340 {
 341         struct inet6_dev *idev = *pidev;
 342
 343         if (idev) {
 344                 in6_dev_put(idev);
 345                 *pidev = NULL;
 346         }
 347 }
 348
 349 static inline void __in6_dev_put(struct inet6_dev *idev)
 350 {
 351         refcount_dec(&idev->refcnt);
 352 }
 353
 354 static inline void in6_dev_hold(struct inet6_dev *idev)
 355 {
 356         refcount_inc(&idev->refcnt);
 357 }
 358
 359 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 360
 361 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 362 {
 363         if (refcount_dec_and_test(&ifp->refcnt))
 364                 inet6_ifa_finish_destroy(ifp);
 365 }
 366
 367 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 368 {
 369         refcount_dec(&ifp->refcnt);
 370 }
 371
 372 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 373 {
 374         refcount_inc(&ifp->refcnt);
 375 }
 376
 377
 378 /*
 379  *      compute link-local solicited-node multicast address
 380  */
 381
 382 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 383                                              struct in6_addr *solicited)
 384 {
 385         ipv6_addr_set(solicited,
 386                       htonl(0xFF020000), 0,
 387                       htonl(0x1),
 388                       htonl(0xFF000000) | addr->s6_addr32[3]);
 389 }
 390
 391 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 392 {
 393 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 394         __be64 *p = (__be64 *)addr;
 395         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 396 #else
 397         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 398                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 399                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 400 #endif
 401 }
 402
 403 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 404 {
 405 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 406         __be64 *p = (__be64 *)addr;
 407         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 408 #else
 409         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 410                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 411                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 412 #endif
 413 }
 414
 415 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 416 {
 417         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 418 }
 419
 420 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 421 {
 422 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 423         __be64 *p = (__be64 *)addr;
 424         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 425                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 426                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 427 #else
 428         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 429                 addr->s6_addr32[1] |
 430                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 431                 (addr->s6_addr[12] ^ 0xff)) == 0;
 432 #endif
 433 }
 434
 435 #ifdef CONFIG_PROC_FS
 436 int if6_proc_init(void);
 437 void if6_proc_exit(void);
 438 #endif
 439
 440 #endif