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 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  66                             const struct net_device *dev, int strict,
  67                             u32 banned_flags);
  68
  69 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  70 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  71 #endif
  72
  73 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  74                                    const unsigned int prefix_len,
  75                                    struct net_device *dev);
  76
  77 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  78
  79 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  80                                      const struct in6_addr *addr,
  81                                      struct net_device *dev, int strict);
  82
  83 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  84                        const struct in6_addr *daddr, unsigned int srcprefs,
  85                        struct in6_addr *saddr);
  86 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  87                       u32 banned_flags);
  88 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  89                     u32 banned_flags);
  90 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
  91 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  92 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
  93
  94 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
  95                                                    unsigned int unit)
  96 {
  97         if (timeout == 0xffffffff)
  98                 return ~0UL;
  99
 100         /*
 101          * Avoid arithmetic overflow.
 102          * Assuming unit is constant and non-zero, this "if" statement
 103          * will go away on 64bit archs.
 104          */
 105         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 106                 return LONG_MAX / unit;
 107
 108         return timeout;
 109 }
 110
 111 static inline int addrconf_finite_timeout(unsigned long timeout)
 112 {
 113         return ~timeout;
 114 }
 115
 116 /*
 117  *      IPv6 Address Label subsystem (addrlabel.c)
 118  */
 119 int ipv6_addr_label_init(void);
 120 void ipv6_addr_label_cleanup(void);
 121 void ipv6_addr_label_rtnl_register(void);
 122 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 123                     int type, int ifindex);
 124
 125 /*
 126  *      multicast prototypes (mcast.c)
 127  */
 128 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 129                       const struct in6_addr *addr);
 130 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 131                       const struct in6_addr *addr);
 132 void ipv6_sock_mc_close(struct sock *sk);
 133 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 134                     const struct in6_addr *src_addr);
 135
 136 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 137 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 138 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 139 void ipv6_mc_up(struct inet6_dev *idev);
 140 void ipv6_mc_down(struct inet6_dev *idev);
 141 void ipv6_mc_unmap(struct inet6_dev *idev);
 142 void ipv6_mc_remap(struct inet6_dev *idev);
 143 void ipv6_mc_init_dev(struct inet6_dev *idev);
 144 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 145 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 146
 147 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 148                          const struct in6_addr *src_addr);
 149
 150 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 151
 152 /* A stub used by vxlan module. This is ugly, ideally these
 153  * symbols should be built into the core kernel.
 154  */
 155 struct ipv6_stub {
 156         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 157                                  const struct in6_addr *addr);
 158         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 159                                  const struct in6_addr *addr);
 160         int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
 161                                 struct flowi6 *fl6);
 162         void (*udpv6_encap_enable)(void);
 163         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
 164                               const struct in6_addr *daddr,
 165                               const struct in6_addr *solicited_addr,
 166                               bool router, bool solicited, bool override, bool inc_opt);
 167         struct neigh_table *nd_tbl;
 168 };
 169 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 170
 171 /*
 172  * identify MLD packets for MLD filter exceptions
 173  */
 174 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 175 {
 176         struct icmp6hdr *hdr;
 177
 178         if (nexthdr != IPPROTO_ICMPV6 ||
 179             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 180                 return false;
 181
 182         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 183
 184         switch (hdr->icmp6_type) {
 185         case ICMPV6_MGM_QUERY:
 186         case ICMPV6_MGM_REPORT:
 187         case ICMPV6_MGM_REDUCTION:
 188         case ICMPV6_MLD2_REPORT:
 189                 return true;
 190         default:
 191                 break;
 192         }
 193         return false;
 194 }
 195
 196 void addrconf_prefix_rcv(struct net_device *dev,
 197                          u8 *opt, int len, bool sllao);
 198
 199 /*
 200  *      anycast prototypes (anycast.c)
 201  */
 202 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 203                       const struct in6_addr *addr);
 204 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 205                       const struct in6_addr *addr);
 206 void ipv6_sock_ac_close(struct sock *sk);
 207
 208 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 209 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 210 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 211 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 212                          const struct in6_addr *addr);
 213 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 214                              const struct in6_addr *addr);
 215
 216 /* Device notifier */
 217 int register_inet6addr_notifier(struct notifier_block *nb);
 218 int unregister_inet6addr_notifier(struct notifier_block *nb);
 219 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 220
 221 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 222                                   struct ipv6_devconf *devconf);
 223
 224 /**
 225  * __in6_dev_get - get inet6_dev pointer from netdevice
 226  * @dev: network device
 227  *
 228  * Caller must hold rcu_read_lock or RTNL, because this function
 229  * does not take a reference on the inet6_dev.
 230  */
 231 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 232 {
 233         return rcu_dereference_rtnl(dev->ip6_ptr);
 234 }
 235
 236 /**
 237  * in6_dev_get - get inet6_dev pointer from netdevice
 238  * @dev: network device
 239  *
 240  * This version can be used in any context, and takes a reference
 241  * on the inet6_dev. Callers must use in6_dev_put() later to
 242  * release this reference.
 243  */
 244 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 245 {
 246         struct inet6_dev *idev;
 247
 248         rcu_read_lock();
 249         idev = rcu_dereference(dev->ip6_ptr);
 250         if (idev)
 251                 atomic_inc(&idev->refcnt);
 252         rcu_read_unlock();
 253         return idev;
 254 }
 255
 256 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 257 {
 258         struct inet6_dev *idev = __in6_dev_get(dev);
 259
 260         return idev ? idev->nd_parms : NULL;
 261 }
 262
 263 void in6_dev_finish_destroy(struct inet6_dev *idev);
 264
 265 static inline void in6_dev_put(struct inet6_dev *idev)
 266 {
 267         if (atomic_dec_and_test(&idev->refcnt))
 268                 in6_dev_finish_destroy(idev);
 269 }
 270
 271 static inline void __in6_dev_put(struct inet6_dev *idev)
 272 {
 273         atomic_dec(&idev->refcnt);
 274 }
 275
 276 static inline void in6_dev_hold(struct inet6_dev *idev)
 277 {
 278         atomic_inc(&idev->refcnt);
 279 }
 280
 281 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 282
 283 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 284 {
 285         if (atomic_dec_and_test(&ifp->refcnt))
 286                 inet6_ifa_finish_destroy(ifp);
 287 }
 288
 289 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 290 {
 291         atomic_dec(&ifp->refcnt);
 292 }
 293
 294 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 295 {
 296         atomic_inc(&ifp->refcnt);
 297 }
 298
 299
 300 /*
 301  *      compute link-local solicited-node multicast address
 302  */
 303
 304 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 305                                              struct in6_addr *solicited)
 306 {
 307         ipv6_addr_set(solicited,
 308                       htonl(0xFF020000), 0,
 309                       htonl(0x1),
 310                       htonl(0xFF000000) | addr->s6_addr32[3]);
 311 }
 312
 313 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 314 {
 315 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 316         __be64 *p = (__be64 *)addr;
 317         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 318 #else
 319         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 320                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 321                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 322 #endif
 323 }
 324
 325 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 326 {
 327 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 328         __be64 *p = (__be64 *)addr;
 329         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 330 #else
 331         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 332                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 333                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 334 #endif
 335 }
 336
 337 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 338 {
 339         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 340 }
 341
 342 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 343 {
 344 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 345         __be64 *p = (__be64 *)addr;
 346         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 347                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 348                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 349 #else
 350         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 351                 addr->s6_addr32[1] |
 352                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 353                 (addr->s6_addr[12] ^ 0xff)) == 0;
 354 #endif
 355 }
 356
 357 #ifdef CONFIG_PROC_FS
 358 int if6_proc_init(void);
 359 void if6_proc_exit(void);
 360 #endif
 361
 362 #endif