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                       unsigned char banned_flags);
  85 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  86                     unsigned char 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
 210
 211 /* Device notifier */
 212 int register_inet6addr_notifier(struct notifier_block *nb);
 213 int unregister_inet6addr_notifier(struct notifier_block *nb);
 214 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 215
 216 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 217                                   struct ipv6_devconf *devconf);
 218
 219 /**
 220  * __in6_dev_get - get inet6_dev pointer from netdevice
 221  * @dev: network device
 222  *
 223  * Caller must hold rcu_read_lock or RTNL, because this function
 224  * does not take a reference on the inet6_dev.
 225  */
 226 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 227 {
 228         return rcu_dereference_rtnl(dev->ip6_ptr);
 229 }
 230
 231 /**
 232  * in6_dev_get - get inet6_dev pointer from netdevice
 233  * @dev: network device
 234  *
 235  * This version can be used in any context, and takes a reference
 236  * on the inet6_dev. Callers must use in6_dev_put() later to
 237  * release this reference.
 238  */
 239 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 240 {
 241         struct inet6_dev *idev;
 242
 243         rcu_read_lock();
 244         idev = rcu_dereference(dev->ip6_ptr);
 245         if (idev)
 246                 atomic_inc(&idev->refcnt);
 247         rcu_read_unlock();
 248         return idev;
 249 }
 250
 251 void in6_dev_finish_destroy(struct inet6_dev *idev);
 252
 253 static inline void in6_dev_put(struct inet6_dev *idev)
 254 {
 255         if (atomic_dec_and_test(&idev->refcnt))
 256                 in6_dev_finish_destroy(idev);
 257 }
 258
 259 static inline void __in6_dev_put(struct inet6_dev *idev)
 260 {
 261         atomic_dec(&idev->refcnt);
 262 }
 263
 264 static inline void in6_dev_hold(struct inet6_dev *idev)
 265 {
 266         atomic_inc(&idev->refcnt);
 267 }
 268
 269 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 270
 271 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 272 {
 273         if (atomic_dec_and_test(&ifp->refcnt))
 274                 inet6_ifa_finish_destroy(ifp);
 275 }
 276
 277 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 278 {
 279         atomic_dec(&ifp->refcnt);
 280 }
 281
 282 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 283 {
 284         atomic_inc(&ifp->refcnt);
 285 }
 286
 287
 288 /*
 289  *      compute link-local solicited-node multicast address
 290  */
 291
 292 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 293                                              struct in6_addr *solicited)
 294 {
 295         ipv6_addr_set(solicited,
 296                       htonl(0xFF020000), 0,
 297                       htonl(0x1),
 298                       htonl(0xFF000000) | addr->s6_addr32[3]);
 299 }
 300
 301 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 302 {
 303         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 304 }
 305
 306 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 307 {
 308 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 309         __u64 *p = (__u64 *)addr;
 310         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 311 #else
 312         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 313                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 314                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 315 #endif
 316 }
 317
 318 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 319 {
 320 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 321         __u64 *p = (__u64 *)addr;
 322         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 323 #else
 324         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 325                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 326                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 327 #endif
 328 }
 329
 330 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 331 {
 332         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 333 }
 334
 335 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 336 {
 337 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 338         __u64 *p = (__u64 *)addr;
 339         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 340                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 341                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 342 #else
 343         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 344                 addr->s6_addr32[1] |
 345                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 346                 (addr->s6_addr[12] ^ 0xff)) == 0;
 347 #endif
 348 }
 349
 350 #ifdef CONFIG_PROC_FS
 351 int if6_proc_init(void);
 352 void if6_proc_exit(void);
 353 #endif
 354
 355 #endif