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         struct neigh_table *nd_tbl;
 157 };
 158 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 159
 160 /*
 161  * identify MLD packets for MLD filter exceptions
 162  */
 163 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 164 {
 165         struct icmp6hdr *hdr;
 166
 167         if (nexthdr != IPPROTO_ICMPV6 ||
 168             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 169                 return false;
 170
 171         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 172
 173         switch (hdr->icmp6_type) {
 174         case ICMPV6_MGM_QUERY:
 175         case ICMPV6_MGM_REPORT:
 176         case ICMPV6_MGM_REDUCTION:
 177         case ICMPV6_MLD2_REPORT:
 178                 return true;
 179         default:
 180                 break;
 181         }
 182         return false;
 183 }
 184
 185 void addrconf_prefix_rcv(struct net_device *dev,
 186                          u8 *opt, int len, bool sllao);
 187
 188 /*
 189  *      anycast prototypes (anycast.c)
 190  */
 191 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 192                       const struct in6_addr *addr);
 193 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 194                       const struct in6_addr *addr);
 195 void ipv6_sock_ac_close(struct sock *sk);
 196
 197 int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
 198 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 199 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 200                                 const struct in6_addr *addr);
 201
 202
 203 /* Device notifier */
 204 int register_inet6addr_notifier(struct notifier_block *nb);
 205 int unregister_inet6addr_notifier(struct notifier_block *nb);
 206 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 207
 208 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 209                                   struct ipv6_devconf *devconf);
 210
 211 /**
 212  * __in6_dev_get - get inet6_dev pointer from netdevice
 213  * @dev: network device
 214  *
 215  * Caller must hold rcu_read_lock or RTNL, because this function
 216  * does not take a reference on the inet6_dev.
 217  */
 218 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 219 {
 220         return rcu_dereference_rtnl(dev->ip6_ptr);
 221 }
 222
 223 /**
 224  * in6_dev_get - get inet6_dev pointer from netdevice
 225  * @dev: network device
 226  *
 227  * This version can be used in any context, and takes a reference
 228  * on the inet6_dev. Callers must use in6_dev_put() later to
 229  * release this reference.
 230  */
 231 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 232 {
 233         struct inet6_dev *idev;
 234
 235         rcu_read_lock();
 236         idev = rcu_dereference(dev->ip6_ptr);
 237         if (idev)
 238                 atomic_inc(&idev->refcnt);
 239         rcu_read_unlock();
 240         return idev;
 241 }
 242
 243 void in6_dev_finish_destroy(struct inet6_dev *idev);
 244
 245 static inline void in6_dev_put(struct inet6_dev *idev)
 246 {
 247         if (atomic_dec_and_test(&idev->refcnt))
 248                 in6_dev_finish_destroy(idev);
 249 }
 250
 251 static inline void __in6_dev_put(struct inet6_dev *idev)
 252 {
 253         atomic_dec(&idev->refcnt);
 254 }
 255
 256 static inline void in6_dev_hold(struct inet6_dev *idev)
 257 {
 258         atomic_inc(&idev->refcnt);
 259 }
 260
 261 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 262
 263 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 264 {
 265         if (atomic_dec_and_test(&ifp->refcnt))
 266                 inet6_ifa_finish_destroy(ifp);
 267 }
 268
 269 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 270 {
 271         atomic_dec(&ifp->refcnt);
 272 }
 273
 274 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 275 {
 276         atomic_inc(&ifp->refcnt);
 277 }
 278
 279
 280 /*
 281  *      compute link-local solicited-node multicast address
 282  */
 283
 284 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 285                                              struct in6_addr *solicited)
 286 {
 287         ipv6_addr_set(solicited,
 288                       htonl(0xFF020000), 0,
 289                       htonl(0x1),
 290                       htonl(0xFF000000) | addr->s6_addr32[3]);
 291 }
 292
 293 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 294 {
 295         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 296 }
 297
 298 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 299 {
 300 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 301         __u64 *p = (__u64 *)addr;
 302         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 303 #else
 304         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 305                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 306                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 307 #endif
 308 }
 309
 310 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 311 {
 312 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 313         __u64 *p = (__u64 *)addr;
 314         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 315 #else
 316         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 317                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 318                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 319 #endif
 320 }
 321
 322 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 323 {
 324         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 325 }
 326
 327 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 328 {
 329 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 330         __u64 *p = (__u64 *)addr;
 331         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 332                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 333                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 334 #else
 335         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 336                 addr->s6_addr32[1] |
 337                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 338                 (addr->s6_addr[12] ^ 0xff)) == 0;
 339 #endif
 340 }
 341
 342 #ifdef CONFIG_PROC_FS
 343 int if6_proc_init(void);
 344 void if6_proc_exit(void);
 345 #endif
 346
 347 #endif