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 #include <linux/in.h>
  23 #include <linux/in6.h>
  24
  25 struct prefix_info {
  26         __u8                    type;
  27         __u8                    length;
  28         __u8                    prefix_len;
  29
  30 #if defined(__BIG_ENDIAN_BITFIELD)
  31         __u8                    onlink : 1,
  32                                 autoconf : 1,
  33                                 reserved : 6;
  34 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  35         __u8                    reserved : 6,
  36                                 autoconf : 1,
  37                                 onlink : 1;
  38 #else
  39 #error "Please fix <asm/byteorder.h>"
  40 #endif
  41         __be32                  valid;
  42         __be32                  prefered;
  43         __be32                  reserved2;
  44
  45         struct in6_addr         prefix;
  46 };
  47
  48
  49 #include <linux/netdevice.h>
  50 #include <net/if_inet6.h>
  51 #include <net/ipv6.h>
  52
  53 #define IN6_ADDR_HSIZE_SHIFT    4
  54 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  55
  56 int addrconf_init(void);
  57 void addrconf_cleanup(void);
  58
  59 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  60 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  61 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  62
  63 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  64                   const struct net_device *dev, int strict);
  65
  66 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  67 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  68 #endif
  69
  70 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  71                                    const unsigned int prefix_len,
  72                                    struct net_device *dev);
  73
  74 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  75
  76 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  77                                      const struct in6_addr *addr,
  78                                      struct net_device *dev, int strict);
  79
  80 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  81                        const struct in6_addr *daddr, unsigned int srcprefs,
  82                        struct in6_addr *saddr);
  83 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  84                       u32 banned_flags);
  85 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  86                     u32 banned_flags);
  87 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
  88 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  89 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
  90
  91 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
  92                                                    unsigned int unit)
  93 {
  94         if (timeout == 0xffffffff)
  95                 return ~0UL;
  96
  97         /*
  98          * Avoid arithmetic overflow.
  99          * Assuming unit is constant and non-zero, this "if" statement
 100          * will go away on 64bit archs.
 101          */
 102         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 103                 return LONG_MAX / unit;
 104
 105         return timeout;
 106 }
 107
 108 static inline int addrconf_finite_timeout(unsigned long timeout)
 109 {
 110         return ~timeout;
 111 }
 112
 113 /*
 114  *      IPv6 Address Label subsystem (addrlabel.c)
 115  */
 116 int ipv6_addr_label_init(void);
 117 void ipv6_addr_label_cleanup(void);
 118 void ipv6_addr_label_rtnl_register(void);
 119 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 120                     int type, int ifindex);
 121
 122 /*
 123  *      multicast prototypes (mcast.c)
 124  */
 125 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 126                       const struct in6_addr *addr);
 127 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 128                       const struct in6_addr *addr);
 129 void ipv6_sock_mc_close(struct sock *sk);
 130 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 131                     const struct in6_addr *src_addr);
 132
 133 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 134 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 135 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 136 void ipv6_mc_up(struct inet6_dev *idev);
 137 void ipv6_mc_down(struct inet6_dev *idev);
 138 void ipv6_mc_unmap(struct inet6_dev *idev);
 139 void ipv6_mc_remap(struct inet6_dev *idev);
 140 void ipv6_mc_init_dev(struct inet6_dev *idev);
 141 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 142 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 143
 144 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 145                          const struct in6_addr *src_addr);
 146
 147 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 148
 149 /* A stub used by vxlan module. This is ugly, ideally these
 150  * symbols should be built into the core kernel.
 151  */
 152 struct ipv6_stub {
 153         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 154                                  const struct in6_addr *addr);
 155         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 156                                  const struct in6_addr *addr);
 157         int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
 158                                 struct flowi6 *fl6);
 159         void (*udpv6_encap_enable)(void);
 160         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
 161                               const struct in6_addr *daddr,
 162                               const struct in6_addr *solicited_addr,
 163                               bool router, bool solicited, bool override, bool inc_opt);
 164         struct neigh_table *nd_tbl;
 165 };
 166 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 167
 168 /*
 169  * identify MLD packets for MLD filter exceptions
 170  */
 171 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 172 {
 173         struct icmp6hdr *hdr;
 174
 175         if (nexthdr != IPPROTO_ICMPV6 ||
 176             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 177                 return false;
 178
 179         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 180
 181         switch (hdr->icmp6_type) {
 182         case ICMPV6_MGM_QUERY:
 183         case ICMPV6_MGM_REPORT:
 184         case ICMPV6_MGM_REDUCTION:
 185         case ICMPV6_MLD2_REPORT:
 186                 return true;
 187         default:
 188                 break;
 189         }
 190         return false;
 191 }
 192
 193 void addrconf_prefix_rcv(struct net_device *dev,
 194                          u8 *opt, int len, bool sllao);
 195
 196 /*
 197  *      anycast prototypes (anycast.c)
 198  */
 199 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 200                       const struct in6_addr *addr);
 201 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 202                       const struct in6_addr *addr);
 203 void ipv6_sock_ac_close(struct sock *sk);
 204
 205 int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 206 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 207 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 208                          const struct in6_addr *addr);
 209 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 210                              const struct in6_addr *addr);
 211
 212 /* Device notifier */
 213 int register_inet6addr_notifier(struct notifier_block *nb);
 214 int unregister_inet6addr_notifier(struct notifier_block *nb);
 215 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 216
 217 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 218                                   struct ipv6_devconf *devconf);
 219
 220 /**
 221  * __in6_dev_get - get inet6_dev pointer from netdevice
 222  * @dev: network device
 223  *
 224  * Caller must hold rcu_read_lock or RTNL, because this function
 225  * does not take a reference on the inet6_dev.
 226  */
 227 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 228 {
 229         return rcu_dereference_rtnl(dev->ip6_ptr);
 230 }
 231
 232 /**
 233  * in6_dev_get - get inet6_dev pointer from netdevice
 234  * @dev: network device
 235  *
 236  * This version can be used in any context, and takes a reference
 237  * on the inet6_dev. Callers must use in6_dev_put() later to
 238  * release this reference.
 239  */
 240 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 241 {
 242         struct inet6_dev *idev;
 243
 244         rcu_read_lock();
 245         idev = rcu_dereference(dev->ip6_ptr);
 246         if (idev)
 247                 atomic_inc(&idev->refcnt);
 248         rcu_read_unlock();
 249         return idev;
 250 }
 251
 252 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 253 {
 254         struct inet6_dev *idev = __in6_dev_get(dev);
 255
 256         return idev ? idev->nd_parms : NULL;
 257 }
 258
 259 void in6_dev_finish_destroy(struct inet6_dev *idev);
 260
 261 static inline void in6_dev_put(struct inet6_dev *idev)
 262 {
 263         if (atomic_dec_and_test(&idev->refcnt))
 264                 in6_dev_finish_destroy(idev);
 265 }
 266
 267 static inline void __in6_dev_put(struct inet6_dev *idev)
 268 {
 269         atomic_dec(&idev->refcnt);
 270 }
 271
 272 static inline void in6_dev_hold(struct inet6_dev *idev)
 273 {
 274         atomic_inc(&idev->refcnt);
 275 }
 276
 277 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 278
 279 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 280 {
 281         if (atomic_dec_and_test(&ifp->refcnt))
 282                 inet6_ifa_finish_destroy(ifp);
 283 }
 284
 285 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 286 {
 287         atomic_dec(&ifp->refcnt);
 288 }
 289
 290 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 291 {
 292         atomic_inc(&ifp->refcnt);
 293 }
 294
 295
 296 /*
 297  *      compute link-local solicited-node multicast address
 298  */
 299
 300 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 301                                              struct in6_addr *solicited)
 302 {
 303         ipv6_addr_set(solicited,
 304                       htonl(0xFF020000), 0,
 305                       htonl(0x1),
 306                       htonl(0xFF000000) | addr->s6_addr32[3]);
 307 }
 308
 309 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 310 {
 311         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 312 }
 313
 314 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 315 {
 316 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 317         __u64 *p = (__u64 *)addr;
 318         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 319 #else
 320         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 321                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 322                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 323 #endif
 324 }
 325
 326 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 327 {
 328 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 329         __u64 *p = (__u64 *)addr;
 330         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 331 #else
 332         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 333                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 334                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 335 #endif
 336 }
 337
 338 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 339 {
 340         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 341 }
 342
 343 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 344 {
 345 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 346         __u64 *p = (__u64 *)addr;
 347         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 348                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 349                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 350 #else
 351         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 352                 addr->s6_addr32[1] |
 353                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 354                 (addr->s6_addr[12] ^ 0xff)) == 0;
 355 #endif
 356 }
 357
 358 #ifdef CONFIG_PROC_FS
 359 int if6_proc_init(void);
 360 void if6_proc_exit(void);
 361 #endif
 362
 363 #endif