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