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 #define ADDRCONF_NOTIFY_PRIORITY        0
  23
  24 #include <linux/in.h>
  25 #include <linux/in6.h>
  26
  27 struct prefix_info {
  28         __u8                    type;
  29         __u8                    length;
  30         __u8                    prefix_len;
  31
  32 #if defined(__BIG_ENDIAN_BITFIELD)
  33         __u8                    onlink : 1,
  34                                 autoconf : 1,
  35                                 reserved : 6;
  36 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  37         __u8                    reserved : 6,
  38                                 autoconf : 1,
  39                                 onlink : 1;
  40 #else
  41 #error "Please fix <asm/byteorder.h>"
  42 #endif
  43         __be32                  valid;
  44         __be32                  prefered;
  45         __be32                  reserved2;
  46
  47         struct in6_addr         prefix;
  48 };
  49
  50
  51 #include <linux/netdevice.h>
  52 #include <net/if_inet6.h>
  53 #include <net/ipv6.h>
  54
  55 #define IN6_ADDR_HSIZE_SHIFT    4
  56 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  57
  58 int addrconf_init(void);
  59 void addrconf_cleanup(void);
  60
  61 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  62 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  63 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  64
  65 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  66                   const struct net_device *dev, int strict);
  67 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  68                             const struct net_device *dev, int strict,
  69                             u32 banned_flags);
  70
  71 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  72 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  73 #endif
  74
  75 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  76                                    const unsigned int prefix_len,
  77                                    struct net_device *dev);
  78
  79 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  80
  81 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  82                                      const struct in6_addr *addr,
  83                                      struct net_device *dev, int strict);
  84
  85 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  86                        const struct in6_addr *daddr, unsigned int srcprefs,
  87                        struct in6_addr *saddr);
  88 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  89                       u32 banned_flags);
  90 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  91                     u32 banned_flags);
  92 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
  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 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
  97 {
  98         if (dev->addr_len != ETH_ALEN)
  99                 return -1;
 100         memcpy(eui, dev->dev_addr, 3);
 101         memcpy(eui + 5, dev->dev_addr + 3, 3);
 102
 103         /*
 104          * The zSeries OSA network cards can be shared among various
 105          * OS instances, but the OSA cards have only one MAC address.
 106          * This leads to duplicate address conflicts in conjunction
 107          * with IPv6 if more than one instance uses the same card.
 108          *
 109          * The driver for these cards can deliver a unique 16-bit
 110          * identifier for each instance sharing the same card.  It is
 111          * placed instead of 0xFFFE in the interface identifier.  The
 112          * "u" bit of the interface identifier is not inverted in this
 113          * case.  Hence the resulting interface identifier has local
 114          * scope according to RFC2373.
 115          */
 116         if (dev->dev_id) {
 117                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 118                 eui[4] = dev->dev_id & 0xFF;
 119         } else {
 120                 eui[3] = 0xFF;
 121                 eui[4] = 0xFE;
 122                 eui[0] ^= 2;
 123         }
 124         return 0;
 125 }
 126
 127 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 128                                                    unsigned int unit)
 129 {
 130         if (timeout == 0xffffffff)
 131                 return ~0UL;
 132
 133         /*
 134          * Avoid arithmetic overflow.
 135          * Assuming unit is constant and non-zero, this "if" statement
 136          * will go away on 64bit archs.
 137          */
 138         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 139                 return LONG_MAX / unit;
 140
 141         return timeout;
 142 }
 143
 144 static inline int addrconf_finite_timeout(unsigned long timeout)
 145 {
 146         return ~timeout;
 147 }
 148
 149 /*
 150  *      IPv6 Address Label subsystem (addrlabel.c)
 151  */
 152 int ipv6_addr_label_init(void);
 153 void ipv6_addr_label_cleanup(void);
 154 void ipv6_addr_label_rtnl_register(void);
 155 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 156                     int type, int ifindex);
 157
 158 /*
 159  *      multicast prototypes (mcast.c)
 160  */
 161 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 162                       const struct in6_addr *addr);
 163 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 164                       const struct in6_addr *addr);
 165 void ipv6_sock_mc_close(struct sock *sk);
 166 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 167                     const struct in6_addr *src_addr);
 168
 169 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 170 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 171 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 172 void ipv6_mc_up(struct inet6_dev *idev);
 173 void ipv6_mc_down(struct inet6_dev *idev);
 174 void ipv6_mc_unmap(struct inet6_dev *idev);
 175 void ipv6_mc_remap(struct inet6_dev *idev);
 176 void ipv6_mc_init_dev(struct inet6_dev *idev);
 177 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 178 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 179 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 180
 181 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 182                          const struct in6_addr *src_addr);
 183
 184 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 185
 186 /* A stub used by vxlan module. This is ugly, ideally these
 187  * symbols should be built into the core kernel.
 188  */
 189 struct ipv6_stub {
 190         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 191                                  const struct in6_addr *addr);
 192         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 193                                  const struct in6_addr *addr);
 194         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 195                                struct dst_entry **dst, struct flowi6 *fl6);
 196         void (*udpv6_encap_enable)(void);
 197         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 198                               const struct in6_addr *solicited_addr,
 199                               bool router, bool solicited, bool override, bool inc_opt);
 200         struct neigh_table *nd_tbl;
 201 };
 202 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 203
 204 /*
 205  * identify MLD packets for MLD filter exceptions
 206  */
 207 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 208 {
 209         struct icmp6hdr *hdr;
 210
 211         if (nexthdr != IPPROTO_ICMPV6 ||
 212             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 213                 return false;
 214
 215         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 216
 217         switch (hdr->icmp6_type) {
 218         case ICMPV6_MGM_QUERY:
 219         case ICMPV6_MGM_REPORT:
 220         case ICMPV6_MGM_REDUCTION:
 221         case ICMPV6_MLD2_REPORT:
 222                 return true;
 223         default:
 224                 break;
 225         }
 226         return false;
 227 }
 228
 229 void addrconf_prefix_rcv(struct net_device *dev,
 230                          u8 *opt, int len, bool sllao);
 231
 232 /*
 233  *      anycast prototypes (anycast.c)
 234  */
 235 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 236                       const struct in6_addr *addr);
 237 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 238                       const struct in6_addr *addr);
 239 void ipv6_sock_ac_close(struct sock *sk);
 240
 241 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 242 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 243 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 244 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 245                          const struct in6_addr *addr);
 246 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 247                              const struct in6_addr *addr);
 248
 249 /* Device notifier */
 250 int register_inet6addr_notifier(struct notifier_block *nb);
 251 int unregister_inet6addr_notifier(struct notifier_block *nb);
 252 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 253
 254 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 255                                   struct ipv6_devconf *devconf);
 256
 257 /**
 258  * __in6_dev_get - get inet6_dev pointer from netdevice
 259  * @dev: network device
 260  *
 261  * Caller must hold rcu_read_lock or RTNL, because this function
 262  * does not take a reference on the inet6_dev.
 263  */
 264 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 265 {
 266         return rcu_dereference_rtnl(dev->ip6_ptr);
 267 }
 268
 269 /**
 270  * in6_dev_get - get inet6_dev pointer from netdevice
 271  * @dev: network device
 272  *
 273  * This version can be used in any context, and takes a reference
 274  * on the inet6_dev. Callers must use in6_dev_put() later to
 275  * release this reference.
 276  */
 277 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 278 {
 279         struct inet6_dev *idev;
 280
 281         rcu_read_lock();
 282         idev = rcu_dereference(dev->ip6_ptr);
 283         if (idev)
 284                 atomic_inc(&idev->refcnt);
 285         rcu_read_unlock();
 286         return idev;
 287 }
 288
 289 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 290 {
 291         struct inet6_dev *idev = __in6_dev_get(dev);
 292
 293         return idev ? idev->nd_parms : NULL;
 294 }
 295
 296 void in6_dev_finish_destroy(struct inet6_dev *idev);
 297
 298 static inline void in6_dev_put(struct inet6_dev *idev)
 299 {
 300         if (atomic_dec_and_test(&idev->refcnt))
 301                 in6_dev_finish_destroy(idev);
 302 }
 303
 304 static inline void __in6_dev_put(struct inet6_dev *idev)
 305 {
 306         atomic_dec(&idev->refcnt);
 307 }
 308
 309 static inline void in6_dev_hold(struct inet6_dev *idev)
 310 {
 311         atomic_inc(&idev->refcnt);
 312 }
 313
 314 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 315
 316 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 317 {
 318         if (atomic_dec_and_test(&ifp->refcnt))
 319                 inet6_ifa_finish_destroy(ifp);
 320 }
 321
 322 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 323 {
 324         atomic_dec(&ifp->refcnt);
 325 }
 326
 327 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 328 {
 329         atomic_inc(&ifp->refcnt);
 330 }
 331
 332
 333 /*
 334  *      compute link-local solicited-node multicast address
 335  */
 336
 337 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 338                                              struct in6_addr *solicited)
 339 {
 340         ipv6_addr_set(solicited,
 341                       htonl(0xFF020000), 0,
 342                       htonl(0x1),
 343                       htonl(0xFF000000) | addr->s6_addr32[3]);
 344 }
 345
 346 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 347 {
 348 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 349         __be64 *p = (__be64 *)addr;
 350         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 351 #else
 352         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 353                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 354                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 355 #endif
 356 }
 357
 358 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 359 {
 360 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 361         __be64 *p = (__be64 *)addr;
 362         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 363 #else
 364         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 365                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 366                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 367 #endif
 368 }
 369
 370 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 371 {
 372         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 373 }
 374
 375 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 376 {
 377 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 378         __be64 *p = (__be64 *)addr;
 379         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 380                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 381                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 382 #else
 383         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 384                 addr->s6_addr32[1] |
 385                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 386                 (addr->s6_addr[12] ^ 0xff)) == 0;
 387 #endif
 388 }
 389
 390 #ifdef CONFIG_PROC_FS
 391 int if6_proc_init(void);
 392 void if6_proc_exit(void);
 393 #endif
 394
 395 #endif