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
  52 #include <linux/netdevice.h>
  53 #include <net/if_inet6.h>
  54 #include <net/ipv6.h>
  55
  56 #define IN6_ADDR_HSIZE_SHIFT    4
  57 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  58
  59 int addrconf_init(void);
  60 void addrconf_cleanup(void);
  61
  62 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  63 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  64 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  65
  66 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  67                   const struct net_device *dev, int strict);
  68 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  69                             const struct net_device *dev, int strict,
  70                             u32 banned_flags);
  71
  72 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  73 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  74 #endif
  75
  76 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  77                                    const unsigned int prefix_len,
  78                                    struct net_device *dev);
  79
  80 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  81
  82 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  83                                      const struct in6_addr *addr,
  84                                      struct net_device *dev, int strict);
  85
  86 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  87                        const struct in6_addr *daddr, unsigned int srcprefs,
  88                        struct in6_addr *saddr);
  89 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  90                       u32 banned_flags);
  91 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  92                     u32 banned_flags);
  93 int ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  94                          bool match_wildcard);
  95 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  96                          bool match_wildcard);
  97 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  98 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
  99
 100 void addrconf_add_linklocal(struct inet6_dev *idev,
 101                             const struct in6_addr *addr, u32 flags);
 102
 103 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 104                                  const struct prefix_info *pinfo,
 105                                  struct inet6_dev *in6_dev,
 106                                  const struct in6_addr *addr, int addr_type,
 107                                  u32 addr_flags, bool sllao, bool tokenized,
 108                                  __u32 valid_lft, u32 prefered_lft);
 109
 110 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 111 {
 112         if (dev->addr_len != ETH_ALEN)
 113                 return -1;
 114         memcpy(eui, dev->dev_addr, 3);
 115         memcpy(eui + 5, dev->dev_addr + 3, 3);
 116
 117         /*
 118          * The zSeries OSA network cards can be shared among various
 119          * OS instances, but the OSA cards have only one MAC address.
 120          * This leads to duplicate address conflicts in conjunction
 121          * with IPv6 if more than one instance uses the same card.
 122          *
 123          * The driver for these cards can deliver a unique 16-bit
 124          * identifier for each instance sharing the same card.  It is
 125          * placed instead of 0xFFFE in the interface identifier.  The
 126          * "u" bit of the interface identifier is not inverted in this
 127          * case.  Hence the resulting interface identifier has local
 128          * scope according to RFC2373.
 129          */
 130         if (dev->dev_id) {
 131                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 132                 eui[4] = dev->dev_id & 0xFF;
 133         } else {
 134                 eui[3] = 0xFF;
 135                 eui[4] = 0xFE;
 136                 eui[0] ^= 2;
 137         }
 138         return 0;
 139 }
 140
 141 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 142                                                    unsigned int unit)
 143 {
 144         if (timeout == 0xffffffff)
 145                 return ~0UL;
 146
 147         /*
 148          * Avoid arithmetic overflow.
 149          * Assuming unit is constant and non-zero, this "if" statement
 150          * will go away on 64bit archs.
 151          */
 152         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 153                 return LONG_MAX / unit;
 154
 155         return timeout;
 156 }
 157
 158 static inline int addrconf_finite_timeout(unsigned long timeout)
 159 {
 160         return ~timeout;
 161 }
 162
 163 /*
 164  *      IPv6 Address Label subsystem (addrlabel.c)
 165  */
 166 int ipv6_addr_label_init(void);
 167 void ipv6_addr_label_cleanup(void);
 168 void ipv6_addr_label_rtnl_register(void);
 169 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 170                     int type, int ifindex);
 171
 172 /*
 173  *      multicast prototypes (mcast.c)
 174  */
 175 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 176                       const struct in6_addr *addr);
 177 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 178                       const struct in6_addr *addr);
 179 void __ipv6_sock_mc_close(struct sock *sk);
 180 void ipv6_sock_mc_close(struct sock *sk);
 181 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 182                     const struct in6_addr *src_addr);
 183
 184 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 185 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 186 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 187 void ipv6_mc_up(struct inet6_dev *idev);
 188 void ipv6_mc_down(struct inet6_dev *idev);
 189 void ipv6_mc_unmap(struct inet6_dev *idev);
 190 void ipv6_mc_remap(struct inet6_dev *idev);
 191 void ipv6_mc_init_dev(struct inet6_dev *idev);
 192 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 193 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 194 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 195
 196 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 197                          const struct in6_addr *src_addr);
 198
 199 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 200
 201 /* A stub used by vxlan module. This is ugly, ideally these
 202  * symbols should be built into the core kernel.
 203  */
 204 struct ipv6_stub {
 205         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 206                                  const struct in6_addr *addr);
 207         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 208                                  const struct in6_addr *addr);
 209         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 210                                struct dst_entry **dst, struct flowi6 *fl6);
 211         void (*udpv6_encap_enable)(void);
 212         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 213                               const struct in6_addr *solicited_addr,
 214                               bool router, bool solicited, bool override, bool inc_opt);
 215         struct neigh_table *nd_tbl;
 216 };
 217 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 218
 219 /*
 220  * identify MLD packets for MLD filter exceptions
 221  */
 222 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 223 {
 224         struct icmp6hdr *hdr;
 225
 226         if (nexthdr != IPPROTO_ICMPV6 ||
 227             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 228                 return false;
 229
 230         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 231
 232         switch (hdr->icmp6_type) {
 233         case ICMPV6_MGM_QUERY:
 234         case ICMPV6_MGM_REPORT:
 235         case ICMPV6_MGM_REDUCTION:
 236         case ICMPV6_MLD2_REPORT:
 237                 return true;
 238         default:
 239                 break;
 240         }
 241         return false;
 242 }
 243
 244 void addrconf_prefix_rcv(struct net_device *dev,
 245                          u8 *opt, int len, bool sllao);
 246
 247 /*
 248  *      anycast prototypes (anycast.c)
 249  */
 250 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 251                       const struct in6_addr *addr);
 252 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 253                       const struct in6_addr *addr);
 254 void ipv6_sock_ac_close(struct sock *sk);
 255
 256 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 257 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 258 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 259 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 260                          const struct in6_addr *addr);
 261 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 262                              const struct in6_addr *addr);
 263
 264 /* Device notifier */
 265 int register_inet6addr_notifier(struct notifier_block *nb);
 266 int unregister_inet6addr_notifier(struct notifier_block *nb);
 267 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 268
 269 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 270                                   struct ipv6_devconf *devconf);
 271
 272 /**
 273  * __in6_dev_get - get inet6_dev pointer from netdevice
 274  * @dev: network device
 275  *
 276  * Caller must hold rcu_read_lock or RTNL, because this function
 277  * does not take a reference on the inet6_dev.
 278  */
 279 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 280 {
 281         return rcu_dereference_rtnl(dev->ip6_ptr);
 282 }
 283
 284 /**
 285  * in6_dev_get - get inet6_dev pointer from netdevice
 286  * @dev: network device
 287  *
 288  * This version can be used in any context, and takes a reference
 289  * on the inet6_dev. Callers must use in6_dev_put() later to
 290  * release this reference.
 291  */
 292 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 293 {
 294         struct inet6_dev *idev;
 295
 296         rcu_read_lock();
 297         idev = rcu_dereference(dev->ip6_ptr);
 298         if (idev)
 299                 atomic_inc(&idev->refcnt);
 300         rcu_read_unlock();
 301         return idev;
 302 }
 303
 304 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 305 {
 306         struct inet6_dev *idev = __in6_dev_get(dev);
 307
 308         return idev ? idev->nd_parms : NULL;
 309 }
 310
 311 void in6_dev_finish_destroy(struct inet6_dev *idev);
 312
 313 static inline void in6_dev_put(struct inet6_dev *idev)
 314 {
 315         if (atomic_dec_and_test(&idev->refcnt))
 316                 in6_dev_finish_destroy(idev);
 317 }
 318
 319 static inline void __in6_dev_put(struct inet6_dev *idev)
 320 {
 321         atomic_dec(&idev->refcnt);
 322 }
 323
 324 static inline void in6_dev_hold(struct inet6_dev *idev)
 325 {
 326         atomic_inc(&idev->refcnt);
 327 }
 328
 329 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 330
 331 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 332 {
 333         if (atomic_dec_and_test(&ifp->refcnt))
 334                 inet6_ifa_finish_destroy(ifp);
 335 }
 336
 337 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 338 {
 339         atomic_dec(&ifp->refcnt);
 340 }
 341
 342 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 343 {
 344         atomic_inc(&ifp->refcnt);
 345 }
 346
 347
 348 /*
 349  *      compute link-local solicited-node multicast address
 350  */
 351
 352 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 353                                              struct in6_addr *solicited)
 354 {
 355         ipv6_addr_set(solicited,
 356                       htonl(0xFF020000), 0,
 357                       htonl(0x1),
 358                       htonl(0xFF000000) | addr->s6_addr32[3]);
 359 }
 360
 361 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 362 {
 363 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 364         __be64 *p = (__be64 *)addr;
 365         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 366 #else
 367         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 368                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 369                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 370 #endif
 371 }
 372
 373 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 374 {
 375 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 376         __be64 *p = (__be64 *)addr;
 377         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 378 #else
 379         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 380                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 381                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 382 #endif
 383 }
 384
 385 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 386 {
 387         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 388 }
 389
 390 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 391 {
 392 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 393         __be64 *p = (__be64 *)addr;
 394         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 395                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 396                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 397 #else
 398         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 399                 addr->s6_addr32[1] |
 400                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 401                 (addr->s6_addr[12] ^ 0xff)) == 0;
 402 #endif
 403 }
 404
 405 #ifdef CONFIG_PROC_FS
 406 int if6_proc_init(void);
 407 void if6_proc_exit(void);
 408 #endif
 409
 410 #endif