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 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 146 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 147
 148 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 149                          const struct in6_addr *src_addr);
 150
 151 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 152
 153 /* A stub used by vxlan module. This is ugly, ideally these
 154  * symbols should be built into the core kernel.
 155  */
 156 struct ipv6_stub {
 157         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 158                                  const struct in6_addr *addr);
 159         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 160                                  const struct in6_addr *addr);
 161         int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
 162                                 struct flowi6 *fl6);
 163         void (*udpv6_encap_enable)(void);
 164         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
 165                               const struct in6_addr *daddr,
 166                               const struct in6_addr *solicited_addr,
 167                               bool router, bool solicited, bool override, bool inc_opt);
 168         struct neigh_table *nd_tbl;
 169 };
 170 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 171
 172 /*
 173  * identify MLD packets for MLD filter exceptions
 174  */
 175 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 176 {
 177         struct icmp6hdr *hdr;
 178
 179         if (nexthdr != IPPROTO_ICMPV6 ||
 180             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 181                 return false;
 182
 183         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 184
 185         switch (hdr->icmp6_type) {
 186         case ICMPV6_MGM_QUERY:
 187         case ICMPV6_MGM_REPORT:
 188         case ICMPV6_MGM_REDUCTION:
 189         case ICMPV6_MLD2_REPORT:
 190                 return true;
 191         default:
 192                 break;
 193         }
 194         return false;
 195 }
 196
 197 void addrconf_prefix_rcv(struct net_device *dev,
 198                          u8 *opt, int len, bool sllao);
 199
 200 /*
 201  *      anycast prototypes (anycast.c)
 202  */
 203 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 204                       const struct in6_addr *addr);
 205 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 206                       const struct in6_addr *addr);
 207 void ipv6_sock_ac_close(struct sock *sk);
 208
 209 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 210 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 211 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 212 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 213                          const struct in6_addr *addr);
 214 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 215                              const struct in6_addr *addr);
 216
 217 /* Device notifier */
 218 int register_inet6addr_notifier(struct notifier_block *nb);
 219 int unregister_inet6addr_notifier(struct notifier_block *nb);
 220 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 221
 222 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 223                                   struct ipv6_devconf *devconf);
 224
 225 /**
 226  * __in6_dev_get - get inet6_dev pointer from netdevice
 227  * @dev: network device
 228  *
 229  * Caller must hold rcu_read_lock or RTNL, because this function
 230  * does not take a reference on the inet6_dev.
 231  */
 232 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 233 {
 234         return rcu_dereference_rtnl(dev->ip6_ptr);
 235 }
 236
 237 /**
 238  * in6_dev_get - get inet6_dev pointer from netdevice
 239  * @dev: network device
 240  *
 241  * This version can be used in any context, and takes a reference
 242  * on the inet6_dev. Callers must use in6_dev_put() later to
 243  * release this reference.
 244  */
 245 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 246 {
 247         struct inet6_dev *idev;
 248
 249         rcu_read_lock();
 250         idev = rcu_dereference(dev->ip6_ptr);
 251         if (idev)
 252                 atomic_inc(&idev->refcnt);
 253         rcu_read_unlock();
 254         return idev;
 255 }
 256
 257 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 258 {
 259         struct inet6_dev *idev = __in6_dev_get(dev);
 260
 261         return idev ? idev->nd_parms : NULL;
 262 }
 263
 264 void in6_dev_finish_destroy(struct inet6_dev *idev);
 265
 266 static inline void in6_dev_put(struct inet6_dev *idev)
 267 {
 268         if (atomic_dec_and_test(&idev->refcnt))
 269                 in6_dev_finish_destroy(idev);
 270 }
 271
 272 static inline void __in6_dev_put(struct inet6_dev *idev)
 273 {
 274         atomic_dec(&idev->refcnt);
 275 }
 276
 277 static inline void in6_dev_hold(struct inet6_dev *idev)
 278 {
 279         atomic_inc(&idev->refcnt);
 280 }
 281
 282 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 283
 284 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 285 {
 286         if (atomic_dec_and_test(&ifp->refcnt))
 287                 inet6_ifa_finish_destroy(ifp);
 288 }
 289
 290 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 291 {
 292         atomic_dec(&ifp->refcnt);
 293 }
 294
 295 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 296 {
 297         atomic_inc(&ifp->refcnt);
 298 }
 299
 300
 301 /*
 302  *      compute link-local solicited-node multicast address
 303  */
 304
 305 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 306                                              struct in6_addr *solicited)
 307 {
 308         ipv6_addr_set(solicited,
 309                       htonl(0xFF020000), 0,
 310                       htonl(0x1),
 311                       htonl(0xFF000000) | addr->s6_addr32[3]);
 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         __be64 *p = (__be64 *)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         __be64 *p = (__be64 *)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         __be64 *p = (__be64 *)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