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 MIN_VALID_LIFETIME              (2*3600)        /* 2 hours */
  10
  11 #define TEMP_VALID_LIFETIME             (7*86400)
  12 #define TEMP_PREFERRED_LIFETIME         (86400)
  13 #define REGEN_MAX_RETRY                 (3)
  14 #define MAX_DESYNC_FACTOR               (600)
  15
  16 #define ADDR_CHECK_FREQUENCY            (120*HZ)
  17
  18 #define IPV6_MAX_ADDRESSES              16
  19
  20 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
  21 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
  22 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
  23
  24 #define ADDRCONF_NOTIFY_PRIORITY        0
  25
  26 #include <linux/in.h>
  27 #include <linux/in6.h>
  28
  29 struct prefix_info {
  30         __u8                    type;
  31         __u8                    length;
  32         __u8                    prefix_len;
  33
  34 #if defined(__BIG_ENDIAN_BITFIELD)
  35         __u8                    onlink : 1,
  36                                 autoconf : 1,
  37                                 reserved : 6;
  38 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  39         __u8                    reserved : 6,
  40                                 autoconf : 1,
  41                                 onlink : 1;
  42 #else
  43 #error "Please fix <asm/byteorder.h>"
  44 #endif
  45         __be32                  valid;
  46         __be32                  prefered;
  47         __be32                  reserved2;
  48
  49         struct in6_addr         prefix;
  50 };
  51
  52 #include <linux/ipv6.h>
  53 #include <linux/netdevice.h>
  54 #include <net/if_inet6.h>
  55 #include <net/ipv6.h>
  56
  57 struct in6_validator_info {
  58         struct in6_addr         i6vi_addr;
  59         struct inet6_dev        *i6vi_dev;
  60         struct netlink_ext_ack  *extack;
  61 };
  62
  63 struct ifa6_config {
  64         const struct in6_addr   *pfx;
  65         unsigned int            plen;
  66
  67         const struct in6_addr   *peer_pfx;
  68
  69         u32                     rt_priority;
  70         u32                     ifa_flags;
  71         u32                     preferred_lft;
  72         u32                     valid_lft;
  73         u16                     scope;
  74 };
  75
  76 int addrconf_init(void);
  77 void addrconf_cleanup(void);
  78
  79 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  80 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  81 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  82
  83 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  84                   const struct net_device *dev, int strict);
  85 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  86                             const struct net_device *dev, bool skip_dev_check,
  87                             int strict, u32 banned_flags);
  88
  89 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  90 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  91 #endif
  92
  93 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
  94                           unsigned char nsegs);
  95
  96 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  97                                    const unsigned int prefix_len,
  98                                    struct net_device *dev);
  99
 100 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
 101
 102 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
 103                                      const struct in6_addr *addr,
 104                                      struct net_device *dev, int strict);
 105
 106 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
 107                        const struct in6_addr *daddr, unsigned int srcprefs,
 108                        struct in6_addr *saddr);
 109 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 110                       u32 banned_flags);
 111 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 112                     u32 banned_flags);
 113 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
 114                           bool match_wildcard);
 115 bool inet_rcv_saddr_any(const struct sock *sk);
 116 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 117 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 118
 119 void addrconf_add_linklocal(struct inet6_dev *idev,
 120                             const struct in6_addr *addr, u32 flags);
 121
 122 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 123                                  const struct prefix_info *pinfo,
 124                                  struct inet6_dev *in6_dev,
 125                                  const struct in6_addr *addr, int addr_type,
 126                                  u32 addr_flags, bool sllao, bool tokenized,
 127                                  __u32 valid_lft, u32 prefered_lft);
 128
 129 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 130 {
 131         memcpy(eui, addr, 3);
 132         eui[3] = 0xFF;
 133         eui[4] = 0xFE;
 134         memcpy(eui + 5, addr + 3, 3);
 135 }
 136
 137 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 138 {
 139         addrconf_addr_eui48_base(eui, addr);
 140         eui[0] ^= 2;
 141 }
 142
 143 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 144 {
 145         if (dev->addr_len != ETH_ALEN)
 146                 return -1;
 147
 148         /*
 149          * The zSeries OSA network cards can be shared among various
 150          * OS instances, but the OSA cards have only one MAC address.
 151          * This leads to duplicate address conflicts in conjunction
 152          * with IPv6 if more than one instance uses the same card.
 153          *
 154          * The driver for these cards can deliver a unique 16-bit
 155          * identifier for each instance sharing the same card.  It is
 156          * placed instead of 0xFFFE in the interface identifier.  The
 157          * "u" bit of the interface identifier is not inverted in this
 158          * case.  Hence the resulting interface identifier has local
 159          * scope according to RFC2373.
 160          */
 161
 162         addrconf_addr_eui48_base(eui, dev->dev_addr);
 163
 164         if (dev->dev_id) {
 165                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 166                 eui[4] = dev->dev_id & 0xFF;
 167         } else {
 168                 eui[0] ^= 2;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 175                                                    unsigned int unit)
 176 {
 177         if (timeout == 0xffffffff)
 178                 return ~0UL;
 179
 180         /*
 181          * Avoid arithmetic overflow.
 182          * Assuming unit is constant and non-zero, this "if" statement
 183          * will go away on 64bit archs.
 184          */
 185         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 186                 return LONG_MAX / unit;
 187
 188         return timeout;
 189 }
 190
 191 static inline int addrconf_finite_timeout(unsigned long timeout)
 192 {
 193         return ~timeout;
 194 }
 195
 196 /*
 197  *      IPv6 Address Label subsystem (addrlabel.c)
 198  */
 199 int ipv6_addr_label_init(void);
 200 void ipv6_addr_label_cleanup(void);
 201 int ipv6_addr_label_rtnl_register(void);
 202 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 203                     int type, int ifindex);
 204
 205 /*
 206  *      multicast prototypes (mcast.c)
 207  */
 208 static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
 209                                     unsigned int len)
 210 {
 211         if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
 212                 return false;
 213
 214         return pskb_may_pull(skb, len);
 215 }
 216
 217 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 218                       const struct in6_addr *addr);
 219 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 220                       const struct in6_addr *addr);
 221 void __ipv6_sock_mc_close(struct sock *sk);
 222 void ipv6_sock_mc_close(struct sock *sk);
 223 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 224                     const struct in6_addr *src_addr);
 225
 226 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 227 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 228 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 229 void ipv6_mc_up(struct inet6_dev *idev);
 230 void ipv6_mc_down(struct inet6_dev *idev);
 231 void ipv6_mc_unmap(struct inet6_dev *idev);
 232 void ipv6_mc_remap(struct inet6_dev *idev);
 233 void ipv6_mc_init_dev(struct inet6_dev *idev);
 234 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 235 int ipv6_mc_check_icmpv6(struct sk_buff *skb);
 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
 281 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 282 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 283 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 284 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 285                          const struct in6_addr *addr);
 286 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 287                              const struct in6_addr *addr);
 288 int ipv6_anycast_init(void);
 289 void ipv6_anycast_cleanup(void);
 290
 291 /* Device notifier */
 292 int register_inet6addr_notifier(struct notifier_block *nb);
 293 int unregister_inet6addr_notifier(struct notifier_block *nb);
 294 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 295
 296 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 297 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 298 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 299
 300 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 301                                   int ifindex, struct ipv6_devconf *devconf);
 302
 303 /**
 304  * __in6_dev_get - get inet6_dev pointer from netdevice
 305  * @dev: network device
 306  *
 307  * Caller must hold rcu_read_lock or RTNL, because this function
 308  * does not take a reference on the inet6_dev.
 309  */
 310 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 311 {
 312         return rcu_dereference_rtnl(dev->ip6_ptr);
 313 }
 314
 315 /**
 316  * __in6_dev_stats_get - get inet6_dev pointer for stats
 317  * @dev: network device
 318  * @skb: skb for original incoming interface if neeeded
 319  *
 320  * Caller must hold rcu_read_lock or RTNL, because this function
 321  * does not take a reference on the inet6_dev.
 322  */
 323 static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
 324                                                     const struct sk_buff *skb)
 325 {
 326         if (netif_is_l3_master(dev))
 327                 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
 328         return __in6_dev_get(dev);
 329 }
 330
 331 /**
 332  * __in6_dev_get_safely - get inet6_dev pointer from netdevice
 333  * @dev: network device
 334  *
 335  * This is a safer version of __in6_dev_get
 336  */
 337 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
 338 {
 339         if (likely(dev))
 340                 return rcu_dereference_rtnl(dev->ip6_ptr);
 341         else
 342                 return NULL;
 343 }
 344
 345 /**
 346  * in6_dev_get - get inet6_dev pointer from netdevice
 347  * @dev: network device
 348  *
 349  * This version can be used in any context, and takes a reference
 350  * on the inet6_dev. Callers must use in6_dev_put() later to
 351  * release this reference.
 352  */
 353 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 354 {
 355         struct inet6_dev *idev;
 356
 357         rcu_read_lock();
 358         idev = rcu_dereference(dev->ip6_ptr);
 359         if (idev)
 360                 refcount_inc(&idev->refcnt);
 361         rcu_read_unlock();
 362         return idev;
 363 }
 364
 365 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 366 {
 367         struct inet6_dev *idev = __in6_dev_get(dev);
 368
 369         return idev ? idev->nd_parms : NULL;
 370 }
 371
 372 void in6_dev_finish_destroy(struct inet6_dev *idev);
 373
 374 static inline void in6_dev_put(struct inet6_dev *idev)
 375 {
 376         if (refcount_dec_and_test(&idev->refcnt))
 377                 in6_dev_finish_destroy(idev);
 378 }
 379
 380 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 381 {
 382         struct inet6_dev *idev = *pidev;
 383
 384         if (idev) {
 385                 in6_dev_put(idev);
 386                 *pidev = NULL;
 387         }
 388 }
 389
 390 static inline void __in6_dev_put(struct inet6_dev *idev)
 391 {
 392         refcount_dec(&idev->refcnt);
 393 }
 394
 395 static inline void in6_dev_hold(struct inet6_dev *idev)
 396 {
 397         refcount_inc(&idev->refcnt);
 398 }
 399
 400 /* called with rcu_read_lock held */
 401 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
 402 {
 403         const struct inet6_dev *idev = __in6_dev_get(dev);
 404
 405         return !!idev->cnf.ignore_routes_with_linkdown;
 406 }
 407
 408 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 409
 410 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 411 {
 412         if (refcount_dec_and_test(&ifp->refcnt))
 413                 inet6_ifa_finish_destroy(ifp);
 414 }
 415
 416 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 417 {
 418         refcount_dec(&ifp->refcnt);
 419 }
 420
 421 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 422 {
 423         refcount_inc(&ifp->refcnt);
 424 }
 425
 426
 427 /*
 428  *      compute link-local solicited-node multicast address
 429  */
 430
 431 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 432                                              struct in6_addr *solicited)
 433 {
 434         ipv6_addr_set(solicited,
 435                       htonl(0xFF020000), 0,
 436                       htonl(0x1),
 437                       htonl(0xFF000000) | addr->s6_addr32[3]);
 438 }
 439
 440 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 441 {
 442 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 443         __be64 *p = (__force __be64 *)addr;
 444         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 445 #else
 446         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 447                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 448                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 449 #endif
 450 }
 451
 452 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 453 {
 454 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 455         __be64 *p = (__force __be64 *)addr;
 456         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 457 #else
 458         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 459                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 460                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 461 #endif
 462 }
 463
 464 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 465 {
 466         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 467 }
 468
 469 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 470 {
 471 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 472         __be64 *p = (__force __be64 *)addr;
 473         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 474                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 475                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 476 #else
 477         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 478                 addr->s6_addr32[1] |
 479                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 480                 (addr->s6_addr[12] ^ 0xff)) == 0;
 481 #endif
 482 }
 483
 484 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
 485 {
 486 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 487         __be64 *p = (__force __be64 *)addr;
 488
 489         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 490                 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
 491 #else
 492         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 493                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 494                 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
 495 #endif
 496 }
 497
 498 #ifdef CONFIG_PROC_FS
 499 int if6_proc_init(void);
 500 void if6_proc_exit(void);
 501 #endif
 502
 503 #endif