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