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/netdevice.h>
  53 #include <net/if_inet6.h>
  54 #include <net/ipv6.h>
  55
  56 struct in6_validator_info {
  57         struct in6_addr         i6vi_addr;
  58         struct inet6_dev        *i6vi_dev;
  59         struct netlink_ext_ack  *extack;
  60 };
  61
  62 struct ifa6_config {
  63         const struct in6_addr   *pfx;
  64         unsigned int            plen;
  65
  66         const struct in6_addr   *peer_pfx;
  67
  68         u32                     rt_priority;
  69         u32                     ifa_flags;
  70         u32                     preferred_lft;
  71         u32                     valid_lft;
  72         u16                     scope;
  73 };
  74
  75 int addrconf_init(void);
  76 void addrconf_cleanup(void);
  77
  78 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  79 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  80 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  81
  82 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  83                   const struct net_device *dev, int strict);
  84 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  85                             const struct net_device *dev, bool skip_dev_check,
  86                             int strict, u32 banned_flags);
  87
  88 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  89 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  90 #endif
  91
  92 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  93                                    const unsigned int prefix_len,
  94                                    struct net_device *dev);
  95
  96 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  97
  98 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  99                                      const struct in6_addr *addr,
 100                                      struct net_device *dev, int strict);
 101
 102 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
 103                        const struct in6_addr *daddr, unsigned int srcprefs,
 104                        struct in6_addr *saddr);
 105 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 106                       u32 banned_flags);
 107 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 108                     u32 banned_flags);
 109 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
 110                           bool match_wildcard);
 111 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 112 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 113
 114 void addrconf_add_linklocal(struct inet6_dev *idev,
 115                             const struct in6_addr *addr, u32 flags);
 116
 117 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 118                                  const struct prefix_info *pinfo,
 119                                  struct inet6_dev *in6_dev,
 120                                  const struct in6_addr *addr, int addr_type,
 121                                  u32 addr_flags, bool sllao, bool tokenized,
 122                                  __u32 valid_lft, u32 prefered_lft);
 123
 124 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 125 {
 126         memcpy(eui, addr, 3);
 127         eui[3] = 0xFF;
 128         eui[4] = 0xFE;
 129         memcpy(eui + 5, addr + 3, 3);
 130 }
 131
 132 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 133 {
 134         addrconf_addr_eui48_base(eui, addr);
 135         eui[0] ^= 2;
 136 }
 137
 138 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 139 {
 140         if (dev->addr_len != ETH_ALEN)
 141                 return -1;
 142
 143         /*
 144          * The zSeries OSA network cards can be shared among various
 145          * OS instances, but the OSA cards have only one MAC address.
 146          * This leads to duplicate address conflicts in conjunction
 147          * with IPv6 if more than one instance uses the same card.
 148          *
 149          * The driver for these cards can deliver a unique 16-bit
 150          * identifier for each instance sharing the same card.  It is
 151          * placed instead of 0xFFFE in the interface identifier.  The
 152          * "u" bit of the interface identifier is not inverted in this
 153          * case.  Hence the resulting interface identifier has local
 154          * scope according to RFC2373.
 155          */
 156
 157         addrconf_addr_eui48_base(eui, dev->dev_addr);
 158
 159         if (dev->dev_id) {
 160                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 161                 eui[4] = dev->dev_id & 0xFF;
 162         } else {
 163                 eui[0] ^= 2;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 170                                                    unsigned int unit)
 171 {
 172         if (timeout == 0xffffffff)
 173                 return ~0UL;
 174
 175         /*
 176          * Avoid arithmetic overflow.
 177          * Assuming unit is constant and non-zero, this "if" statement
 178          * will go away on 64bit archs.
 179          */
 180         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 181                 return LONG_MAX / unit;
 182
 183         return timeout;
 184 }
 185
 186 static inline int addrconf_finite_timeout(unsigned long timeout)
 187 {
 188         return ~timeout;
 189 }
 190
 191 /*
 192  *      IPv6 Address Label subsystem (addrlabel.c)
 193  */
 194 int ipv6_addr_label_init(void);
 195 void ipv6_addr_label_cleanup(void);
 196 int ipv6_addr_label_rtnl_register(void);
 197 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 198                     int type, int ifindex);
 199
 200 /*
 201  *      multicast prototypes (mcast.c)
 202  */
 203 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 204                       const struct in6_addr *addr);
 205 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 206                       const struct in6_addr *addr);
 207 void __ipv6_sock_mc_close(struct sock *sk);
 208 void ipv6_sock_mc_close(struct sock *sk);
 209 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 210                     const struct in6_addr *src_addr);
 211
 212 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 213 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 214 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 215 void ipv6_mc_up(struct inet6_dev *idev);
 216 void ipv6_mc_down(struct inet6_dev *idev);
 217 void ipv6_mc_unmap(struct inet6_dev *idev);
 218 void ipv6_mc_remap(struct inet6_dev *idev);
 219 void ipv6_mc_init_dev(struct inet6_dev *idev);
 220 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 221 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 222 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
 223
 224 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 225                          const struct in6_addr *src_addr);
 226
 227 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 228
 229 /* A stub used by vxlan module. This is ugly, ideally these
 230  * symbols should be built into the core kernel.
 231  */
 232 struct ipv6_stub {
 233         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 234                                  const struct in6_addr *addr);
 235         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 236                                  const struct in6_addr *addr);
 237         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 238                                struct dst_entry **dst, struct flowi6 *fl6);
 239
 240         struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
 241         struct fib6_info *(*fib6_lookup)(struct net *net, int oif,
 242                                          struct flowi6 *fl6, int flags);
 243         struct fib6_info *(*fib6_table_lookup)(struct net *net,
 244                                               struct fib6_table *table,
 245                                               int oif, struct flowi6 *fl6,
 246                                               int flags);
 247         struct fib6_info *(*fib6_multipath_select)(const struct net *net,
 248                                                    struct fib6_info *f6i,
 249                                                    struct flowi6 *fl6, int oif,
 250                                                    const struct sk_buff *skb,
 251                                                    int strict);
 252         u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
 253                                  struct in6_addr *saddr);
 254
 255         void (*udpv6_encap_enable)(void);
 256         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 257                               const struct in6_addr *solicited_addr,
 258                               bool router, bool solicited, bool override, bool inc_opt);
 259         struct neigh_table *nd_tbl;
 260 };
 261 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 262
 263 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
 264 struct ipv6_bpf_stub {
 265         int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 266                           bool force_bind_address_no_port, bool with_lock);
 267 };
 268 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
 269
 270 /*
 271  * identify MLD packets for MLD filter exceptions
 272  */
 273 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 274 {
 275         struct icmp6hdr *hdr;
 276
 277         if (nexthdr != IPPROTO_ICMPV6 ||
 278             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 279                 return false;
 280
 281         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 282
 283         switch (hdr->icmp6_type) {
 284         case ICMPV6_MGM_QUERY:
 285         case ICMPV6_MGM_REPORT:
 286         case ICMPV6_MGM_REDUCTION:
 287         case ICMPV6_MLD2_REPORT:
 288                 return true;
 289         default:
 290                 break;
 291         }
 292         return false;
 293 }
 294
 295 void addrconf_prefix_rcv(struct net_device *dev,
 296                          u8 *opt, int len, bool sllao);
 297
 298 /*
 299  *      anycast prototypes (anycast.c)
 300  */
 301 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 302                       const struct in6_addr *addr);
 303 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 304                       const struct in6_addr *addr);
 305 void ipv6_sock_ac_close(struct sock *sk);
 306
 307 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 308 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 309 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 310 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 311                          const struct in6_addr *addr);
 312 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 313                              const struct in6_addr *addr);
 314
 315 /* Device notifier */
 316 int register_inet6addr_notifier(struct notifier_block *nb);
 317 int unregister_inet6addr_notifier(struct notifier_block *nb);
 318 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 319
 320 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 321 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 322 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 323
 324 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 325                                   int ifindex, struct ipv6_devconf *devconf);
 326
 327 /**
 328  * __in6_dev_get - get inet6_dev pointer from netdevice
 329  * @dev: network device
 330  *
 331  * Caller must hold rcu_read_lock or RTNL, because this function
 332  * does not take a reference on the inet6_dev.
 333  */
 334 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 335 {
 336         return rcu_dereference_rtnl(dev->ip6_ptr);
 337 }
 338
 339 /**
 340  * __in6_dev_get_safely - get inet6_dev pointer from netdevice
 341  * @dev: network device
 342  *
 343  * This is a safer version of __in6_dev_get
 344  */
 345 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
 346 {
 347         if (likely(dev))
 348                 return rcu_dereference_rtnl(dev->ip6_ptr);
 349         else
 350                 return NULL;
 351 }
 352
 353 /**
 354  * in6_dev_get - get inet6_dev pointer from netdevice
 355  * @dev: network device
 356  *
 357  * This version can be used in any context, and takes a reference
 358  * on the inet6_dev. Callers must use in6_dev_put() later to
 359  * release this reference.
 360  */
 361 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 362 {
 363         struct inet6_dev *idev;
 364
 365         rcu_read_lock();
 366         idev = rcu_dereference(dev->ip6_ptr);
 367         if (idev)
 368                 refcount_inc(&idev->refcnt);
 369         rcu_read_unlock();
 370         return idev;
 371 }
 372
 373 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 374 {
 375         struct inet6_dev *idev = __in6_dev_get(dev);
 376
 377         return idev ? idev->nd_parms : NULL;
 378 }
 379
 380 void in6_dev_finish_destroy(struct inet6_dev *idev);
 381
 382 static inline void in6_dev_put(struct inet6_dev *idev)
 383 {
 384         if (refcount_dec_and_test(&idev->refcnt))
 385                 in6_dev_finish_destroy(idev);
 386 }
 387
 388 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 389 {
 390         struct inet6_dev *idev = *pidev;
 391
 392         if (idev) {
 393                 in6_dev_put(idev);
 394                 *pidev = NULL;
 395         }
 396 }
 397
 398 static inline void __in6_dev_put(struct inet6_dev *idev)
 399 {
 400         refcount_dec(&idev->refcnt);
 401 }
 402
 403 static inline void in6_dev_hold(struct inet6_dev *idev)
 404 {
 405         refcount_inc(&idev->refcnt);
 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 = (__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 = (__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 = (__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 #ifdef CONFIG_PROC_FS
 485 int if6_proc_init(void);
 486 void if6_proc_exit(void);
 487 #endif
 488
 489 #endif