include/net/addrconf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ADDRCONF_H
   3 #define _ADDRCONF_H
   4
   5 #define MAX_RTR_SOLICITATIONS           -1              /* unlimited */
   6 #define RTR_SOLICITATION_INTERVAL       (4*HZ)
   7 #define RTR_SOLICITATION_MAX_INTERVAL   (3600*HZ)       /* 1 hour */
   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 #define ADDRCONF_NOTIFY_PRIORITY        0
  23
  24 #include <linux/in.h>
  25 #include <linux/in6.h>
  26
  27 struct prefix_info {
  28         __u8                    type;
  29         __u8                    length;
  30         __u8                    prefix_len;
  31
  32 #if defined(__BIG_ENDIAN_BITFIELD)
  33         __u8                    onlink : 1,
  34                                 autoconf : 1,
  35                                 reserved : 6;
  36 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  37         __u8                    reserved : 6,
  38                                 autoconf : 1,
  39                                 onlink : 1;
  40 #else
  41 #error "Please fix <asm/byteorder.h>"
  42 #endif
  43         __be32                  valid;
  44         __be32                  prefered;
  45         __be32                  reserved2;
  46
  47         struct in6_addr         prefix;
  48 };
  49
  50 #include <linux/ipv6.h>
  51 #include <linux/netdevice.h>
  52 #include <net/if_inet6.h>
  53 #include <net/ipv6.h>
  54
  55 struct in6_validator_info {
  56         struct in6_addr         i6vi_addr;
  57         struct inet6_dev        *i6vi_dev;
  58         struct netlink_ext_ack  *extack;
  59 };
  60
  61 struct ifa6_config {
  62         const struct in6_addr   *pfx;
  63         unsigned int            plen;
  64
  65         const struct in6_addr   *peer_pfx;
  66
  67         u32                     rt_priority;
  68         u32                     ifa_flags;
  69         u32                     preferred_lft;
  70         u32                     valid_lft;
  71         u16                     scope;
  72 };
  73
  74 int addrconf_init(void);
  75 void addrconf_cleanup(void);
  76
  77 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  78 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  79 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  80
  81 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  82                   const struct net_device *dev, int strict);
  83 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  84                             const struct net_device *dev, bool skip_dev_check,
  85                             int strict, u32 banned_flags);
  86
  87 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  88 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  89 #endif
  90
  91 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
  92                           unsigned char nsegs);
  93
  94 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  95                                    const unsigned int prefix_len,
  96                                    struct net_device *dev);
  97
  98 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  99
 100 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
 101                                  struct net_device *dev);
 102
 103 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
 104                                      const struct in6_addr *addr,
 105                                      struct net_device *dev, int strict);
 106
 107 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
 108                        const struct in6_addr *daddr, unsigned int srcprefs,
 109                        struct in6_addr *saddr);
 110 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 111                       u32 banned_flags);
 112 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 113                     u32 banned_flags);
 114 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
 115                           bool match_wildcard);
 116 bool inet_rcv_saddr_any(const struct sock *sk);
 117 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 118 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 119
 120 void addrconf_add_linklocal(struct inet6_dev *idev,
 121                             const struct in6_addr *addr, u32 flags);
 122
 123 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 124                                  const struct prefix_info *pinfo,
 125                                  struct inet6_dev *in6_dev,
 126                                  const struct in6_addr *addr, int addr_type,
 127                                  u32 addr_flags, bool sllao, bool tokenized,
 128                                  __u32 valid_lft, u32 prefered_lft);
 129
 130 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 131 {
 132         memcpy(eui, addr, 3);
 133         eui[3] = 0xFF;
 134         eui[4] = 0xFE;
 135         memcpy(eui + 5, addr + 3, 3);
 136 }
 137
 138 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 139 {
 140         addrconf_addr_eui48_base(eui, addr);
 141         eui[0] ^= 2;
 142 }
 143
 144 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 145 {
 146         if (dev->addr_len != ETH_ALEN)
 147                 return -1;
 148
 149         /*
 150          * The zSeries OSA network cards can be shared among various
 151          * OS instances, but the OSA cards have only one MAC address.
 152          * This leads to duplicate address conflicts in conjunction
 153          * with IPv6 if more than one instance uses the same card.
 154          *
 155          * The driver for these cards can deliver a unique 16-bit
 156          * identifier for each instance sharing the same card.  It is
 157          * placed instead of 0xFFFE in the interface identifier.  The
 158          * "u" bit of the interface identifier is not inverted in this
 159          * case.  Hence the resulting interface identifier has local
 160          * scope according to RFC2373.
 161          */
 162
 163         addrconf_addr_eui48_base(eui, dev->dev_addr);
 164
 165         if (dev->dev_id) {
 166                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 167                 eui[4] = dev->dev_id & 0xFF;
 168         } else {
 169                 eui[0] ^= 2;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 176                                                    unsigned int unit)
 177 {
 178         if (timeout == 0xffffffff)
 179                 return ~0UL;
 180
 181         /*
 182          * Avoid arithmetic overflow.
 183          * Assuming unit is constant and non-zero, this "if" statement
 184          * will go away on 64bit archs.
 185          */
 186         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 187                 return LONG_MAX / unit;
 188
 189         return timeout;
 190 }
 191
 192 static inline int addrconf_finite_timeout(unsigned long timeout)
 193 {
 194         return ~timeout;
 195 }
 196
 197 /*
 198  *      IPv6 Address Label subsystem (addrlabel.c)
 199  */
 200 int ipv6_addr_label_init(void);
 201 void ipv6_addr_label_cleanup(void);
 202 int ipv6_addr_label_rtnl_register(void);
 203 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 204                     int type, int ifindex);
 205
 206 /*
 207  *      multicast prototypes (mcast.c)
 208  */
 209 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
 210                                     unsigned int len)
 211 {
 212         if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
 213                 return false;
 214
 215         return pskb_may_pull(skb, len);
 216 }
 217
 218 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 219                       const struct in6_addr *addr);
 220 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 221                       const struct in6_addr *addr);
 222 void __ipv6_sock_mc_close(struct sock *sk);
 223 void ipv6_sock_mc_close(struct sock *sk);
 224 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 225                     const struct in6_addr *src_addr);
 226
 227 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 228 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 229 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 230 void ipv6_mc_up(struct inet6_dev *idev);
 231 void ipv6_mc_down(struct inet6_dev *idev);
 232 void ipv6_mc_unmap(struct inet6_dev *idev);
 233 void ipv6_mc_remap(struct inet6_dev *idev);
 234 void ipv6_mc_init_dev(struct inet6_dev *idev);
 235 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 236 int ipv6_mc_check_mld(struct sk_buff *skb);
 237 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
 238
 239 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 240                          const struct in6_addr *src_addr);
 241
 242 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 243
 244 /*
 245  * identify MLD packets for MLD filter exceptions
 246  */
 247 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 248 {
 249         struct icmp6hdr *hdr;
 250
 251         if (nexthdr != IPPROTO_ICMPV6 ||
 252             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 253                 return false;
 254
 255         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 256
 257         switch (hdr->icmp6_type) {
 258         case ICMPV6_MGM_QUERY:
 259         case ICMPV6_MGM_REPORT:
 260         case ICMPV6_MGM_REDUCTION:
 261         case ICMPV6_MLD2_REPORT:
 262                 return true;
 263         default:
 264                 break;
 265         }
 266         return false;
 267 }
 268
 269 void addrconf_prefix_rcv(struct net_device *dev,
 270                          u8 *opt, int len, bool sllao);
 271
 272 /*
 273  *      anycast prototypes (anycast.c)
 274  */
 275 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 276                       const struct in6_addr *addr);
 277 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 278                       const struct in6_addr *addr);
 279 void __ipv6_sock_ac_close(struct sock *sk);
 280 void ipv6_sock_ac_close(struct sock *sk);
 281
 282 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 283 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 284 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 285 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 286                          const struct in6_addr *addr);
 287 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 288                              const struct in6_addr *addr);
 289 int ipv6_anycast_init(void);
 290 void ipv6_anycast_cleanup(void);
 291
 292 /* Device notifier */
 293 int register_inet6addr_notifier(struct notifier_block *nb);
 294 int unregister_inet6addr_notifier(struct notifier_block *nb);
 295 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 296
 297 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 298 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 299 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 300
 301 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 302                                   int ifindex, struct ipv6_devconf *devconf);
 303
 304 /**
 305  * __in6_dev_get - get inet6_dev pointer from netdevice
 306  * @dev: network device
 307  *
 308  * Caller must hold rcu_read_lock or RTNL, because this function
 309  * does not take a reference on the inet6_dev.
 310  */
 311 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 312 {
 313         return rcu_dereference_rtnl(dev->ip6_ptr);
 314 }
 315
 316 /**
 317  * __in6_dev_stats_get - get inet6_dev pointer for stats
 318  * @dev: network device
 319  * @skb: skb for original incoming interface if neeeded
 320  *
 321  * Caller must hold rcu_read_lock or RTNL, because this function
 322  * does not take a reference on the inet6_dev.
 323  */
 324 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
 325                                                     const struct sk_buff *skb)
 326 {
 327         if (netif_is_l3_master(dev))
 328                 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
 329         return __in6_dev_get(dev);
 330 }
 331
 332 /**
 333  * __in6_dev_get_safely - get inet6_dev pointer from netdevice
 334  * @dev: network device
 335  *
 336  * This is a safer version of __in6_dev_get
 337  */
 338 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
 339 {
 340         if (likely(dev))
 341                 return rcu_dereference_rtnl(dev->ip6_ptr);
 342         else
 343                 return NULL;
 344 }
 345
 346 /**
 347  * in6_dev_get - get inet6_dev pointer from netdevice
 348  * @dev: network device
 349  *
 350  * This version can be used in any context, and takes a reference
 351  * on the inet6_dev. Callers must use in6_dev_put() later to
 352  * release this reference.
 353  */
 354 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 355 {
 356         struct inet6_dev *idev;
 357
 358         rcu_read_lock();
 359         idev = rcu_dereference(dev->ip6_ptr);
 360         if (idev)
 361                 refcount_inc(&idev->refcnt);
 362         rcu_read_unlock();
 363         return idev;
 364 }
 365
 366 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 367 {
 368         struct inet6_dev *idev = __in6_dev_get(dev);
 369
 370         return idev ? idev->nd_parms : NULL;
 371 }
 372
 373 void in6_dev_finish_destroy(struct inet6_dev *idev);
 374
 375 static inline void in6_dev_put(struct inet6_dev *idev)
 376 {
 377         if (refcount_dec_and_test(&idev->refcnt))
 378                 in6_dev_finish_destroy(idev);
 379 }
 380
 381 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 382 {
 383         struct inet6_dev *idev = *pidev;
 384
 385         if (idev) {
 386                 in6_dev_put(idev);
 387                 *pidev = NULL;
 388         }
 389 }
 390
 391 static inline void __in6_dev_put(struct inet6_dev *idev)
 392 {
 393         refcount_dec(&idev->refcnt);
 394 }
 395
 396 static inline void in6_dev_hold(struct inet6_dev *idev)
 397 {
 398         refcount_inc(&idev->refcnt);
 399 }
 400
 401 /* called with rcu_read_lock held */
 402 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
 403 {
 404         const struct inet6_dev *idev = __in6_dev_get(dev);
 405
 406         return !!idev->cnf.ignore_routes_with_linkdown;
 407 }
 408
 409 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 410
 411 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 412 {
 413         if (refcount_dec_and_test(&ifp->refcnt))
 414                 inet6_ifa_finish_destroy(ifp);
 415 }
 416
 417 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 418 {
 419         refcount_dec(&ifp->refcnt);
 420 }
 421
 422 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 423 {
 424         refcount_inc(&ifp->refcnt);
 425 }
 426
 427
 428 /*
 429  *      compute link-local solicited-node multicast address
 430  */
 431
 432 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 433                                              struct in6_addr *solicited)
 434 {
 435         ipv6_addr_set(solicited,
 436                       htonl(0xFF020000), 0,
 437                       htonl(0x1),
 438                       htonl(0xFF000000) | addr->s6_addr32[3]);
 439 }
 440
 441 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 442 {
 443 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 444         __be64 *p = (__force __be64 *)addr;
 445         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 446 #else
 447         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 448                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 449                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 450 #endif
 451 }
 452
 453 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 454 {
 455 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 456         __be64 *p = (__force __be64 *)addr;
 457         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 458 #else
 459         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 460                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 461                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 462 #endif
 463 }
 464
 465 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 466 {
 467         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 468 }
 469
 470 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 471 {
 472 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 473         __be64 *p = (__force __be64 *)addr;
 474         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 475                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 476                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 477 #else
 478         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 479                 addr->s6_addr32[1] |
 480                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 481                 (addr->s6_addr[12] ^ 0xff)) == 0;
 482 #endif
 483 }
 484
 485 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
 486 {
 487 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 488         __be64 *p = (__force __be64 *)addr;
 489
 490         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 491                 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
 492 #else
 493         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 494                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 495                 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
 496 #endif
 497 }
 498
 499 #ifdef CONFIG_PROC_FS
 500 int if6_proc_init(void);
 501 void if6_proc_exit(void);
 502 #endif
 503
 504 #endif