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 ipv4_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  91                          bool match_wildcard);
  92 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  93                          bool match_wildcard);
  94 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  95 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
  96
  97 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
  98 {
  99         if (dev->addr_len != ETH_ALEN)
 100                 return -1;
 101         memcpy(eui, dev->dev_addr, 3);
 102         memcpy(eui + 5, dev->dev_addr + 3, 3);
 103
 104         /*
 105          * The zSeries OSA network cards can be shared among various
 106          * OS instances, but the OSA cards have only one MAC address.
 107          * This leads to duplicate address conflicts in conjunction
 108          * with IPv6 if more than one instance uses the same card.
 109          *
 110          * The driver for these cards can deliver a unique 16-bit
 111          * identifier for each instance sharing the same card.  It is
 112          * placed instead of 0xFFFE in the interface identifier.  The
 113          * "u" bit of the interface identifier is not inverted in this
 114          * case.  Hence the resulting interface identifier has local
 115          * scope according to RFC2373.
 116          */
 117         if (dev->dev_id) {
 118                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 119                 eui[4] = dev->dev_id & 0xFF;
 120         } else {
 121                 eui[3] = 0xFF;
 122                 eui[4] = 0xFE;
 123                 eui[0] ^= 2;
 124         }
 125         return 0;
 126 }
 127
 128 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 129                                                    unsigned int unit)
 130 {
 131         if (timeout == 0xffffffff)
 132                 return ~0UL;
 133
 134         /*
 135          * Avoid arithmetic overflow.
 136          * Assuming unit is constant and non-zero, this "if" statement
 137          * will go away on 64bit archs.
 138          */
 139         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 140                 return LONG_MAX / unit;
 141
 142         return timeout;
 143 }
 144
 145 static inline int addrconf_finite_timeout(unsigned long timeout)
 146 {
 147         return ~timeout;
 148 }
 149
 150 /*
 151  *      IPv6 Address Label subsystem (addrlabel.c)
 152  */
 153 int ipv6_addr_label_init(void);
 154 void ipv6_addr_label_cleanup(void);
 155 void ipv6_addr_label_rtnl_register(void);
 156 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 157                     int type, int ifindex);
 158
 159 /*
 160  *      multicast prototypes (mcast.c)
 161  */
 162 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 163                       const struct in6_addr *addr);
 164 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 165                       const struct in6_addr *addr);
 166 void ipv6_sock_mc_close(struct sock *sk);
 167 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 168                     const struct in6_addr *src_addr);
 169
 170 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 171 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 172 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 173 void ipv6_mc_up(struct inet6_dev *idev);
 174 void ipv6_mc_down(struct inet6_dev *idev);
 175 void ipv6_mc_unmap(struct inet6_dev *idev);
 176 void ipv6_mc_remap(struct inet6_dev *idev);
 177 void ipv6_mc_init_dev(struct inet6_dev *idev);
 178 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 179 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 180 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 181
 182 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 183                          const struct in6_addr *src_addr);
 184
 185 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 186
 187 /* A stub used by vxlan module. This is ugly, ideally these
 188  * symbols should be built into the core kernel.
 189  */
 190 struct ipv6_stub {
 191         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 192                                  const struct in6_addr *addr);
 193         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 194                                  const struct in6_addr *addr);
 195         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 196                                struct dst_entry **dst, struct flowi6 *fl6);
 197         void (*udpv6_encap_enable)(void);
 198         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 199                               const struct in6_addr *solicited_addr,
 200                               bool router, bool solicited, bool override, bool inc_opt);
 201         struct neigh_table *nd_tbl;
 202 };
 203 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 204
 205 /*
 206  * identify MLD packets for MLD filter exceptions
 207  */
 208 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 209 {
 210         struct icmp6hdr *hdr;
 211
 212         if (nexthdr != IPPROTO_ICMPV6 ||
 213             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 214                 return false;
 215
 216         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 217
 218         switch (hdr->icmp6_type) {
 219         case ICMPV6_MGM_QUERY:
 220         case ICMPV6_MGM_REPORT:
 221         case ICMPV6_MGM_REDUCTION:
 222         case ICMPV6_MLD2_REPORT:
 223                 return true;
 224         default:
 225                 break;
 226         }
 227         return false;
 228 }
 229
 230 void addrconf_prefix_rcv(struct net_device *dev,
 231                          u8 *opt, int len, bool sllao);
 232
 233 /*
 234  *      anycast prototypes (anycast.c)
 235  */
 236 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 237                       const struct in6_addr *addr);
 238 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 239                       const struct in6_addr *addr);
 240 void ipv6_sock_ac_close(struct sock *sk);
 241
 242 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 243 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 244 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 245 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 246                          const struct in6_addr *addr);
 247 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 248                              const struct in6_addr *addr);
 249
 250 /* Device notifier */
 251 int register_inet6addr_notifier(struct notifier_block *nb);
 252 int unregister_inet6addr_notifier(struct notifier_block *nb);
 253 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 254
 255 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 256                                   struct ipv6_devconf *devconf);
 257
 258 /**
 259  * __in6_dev_get - get inet6_dev pointer from netdevice
 260  * @dev: network device
 261  *
 262  * Caller must hold rcu_read_lock or RTNL, because this function
 263  * does not take a reference on the inet6_dev.
 264  */
 265 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 266 {
 267         return rcu_dereference_rtnl(dev->ip6_ptr);
 268 }
 269
 270 /**
 271  * in6_dev_get - get inet6_dev pointer from netdevice
 272  * @dev: network device
 273  *
 274  * This version can be used in any context, and takes a reference
 275  * on the inet6_dev. Callers must use in6_dev_put() later to
 276  * release this reference.
 277  */
 278 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 279 {
 280         struct inet6_dev *idev;
 281
 282         rcu_read_lock();
 283         idev = rcu_dereference(dev->ip6_ptr);
 284         if (idev)
 285                 atomic_inc(&idev->refcnt);
 286         rcu_read_unlock();
 287         return idev;
 288 }
 289
 290 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 291 {
 292         struct inet6_dev *idev = __in6_dev_get(dev);
 293
 294         return idev ? idev->nd_parms : NULL;
 295 }
 296
 297 void in6_dev_finish_destroy(struct inet6_dev *idev);
 298
 299 static inline void in6_dev_put(struct inet6_dev *idev)
 300 {
 301         if (atomic_dec_and_test(&idev->refcnt))
 302                 in6_dev_finish_destroy(idev);
 303 }
 304
 305 static inline void __in6_dev_put(struct inet6_dev *idev)
 306 {
 307         atomic_dec(&idev->refcnt);
 308 }
 309
 310 static inline void in6_dev_hold(struct inet6_dev *idev)
 311 {
 312         atomic_inc(&idev->refcnt);
 313 }
 314
 315 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 316
 317 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 318 {
 319         if (atomic_dec_and_test(&ifp->refcnt))
 320                 inet6_ifa_finish_destroy(ifp);
 321 }
 322
 323 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 324 {
 325         atomic_dec(&ifp->refcnt);
 326 }
 327
 328 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 329 {
 330         atomic_inc(&ifp->refcnt);
 331 }
 332
 333
 334 /*
 335  *      compute link-local solicited-node multicast address
 336  */
 337
 338 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 339                                              struct in6_addr *solicited)
 340 {
 341         ipv6_addr_set(solicited,
 342                       htonl(0xFF020000), 0,
 343                       htonl(0x1),
 344                       htonl(0xFF000000) | addr->s6_addr32[3]);
 345 }
 346
 347 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 348 {
 349 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 350         __be64 *p = (__be64 *)addr;
 351         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 352 #else
 353         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 354                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 355                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 356 #endif
 357 }
 358
 359 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 360 {
 361 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 362         __be64 *p = (__be64 *)addr;
 363         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 364 #else
 365         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 366                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 367                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 368 #endif
 369 }
 370
 371 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 372 {
 373         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 374 }
 375
 376 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 377 {
 378 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 379         __be64 *p = (__be64 *)addr;
 380         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 381                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 382                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 383 #else
 384         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 385                 addr->s6_addr32[1] |
 386                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 387                 (addr->s6_addr[12] ^ 0xff)) == 0;
 388 #endif
 389 }
 390
 391 #ifdef CONFIG_PROC_FS
 392 int if6_proc_init(void);
 393 void if6_proc_exit(void);
 394 #endif
 395
 396 #endif