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