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