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 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  94                                    const unsigned int prefix_len,
  95                                    struct net_device *dev);
  96
  97 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  98
  99 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
 100                                      const struct in6_addr *addr,
 101                                      struct net_device *dev, int strict);
 102
 103 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
 104                        const struct in6_addr *daddr, unsigned int srcprefs,
 105                        struct in6_addr *saddr);
 106 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 107                       u32 banned_flags);
 108 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
 109                     u32 banned_flags);
 110 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
 111                           bool match_wildcard);
 112 bool inet_rcv_saddr_any(const struct sock *sk);
 113 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 114 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 115
 116 void addrconf_add_linklocal(struct inet6_dev *idev,
 117                             const struct in6_addr *addr, u32 flags);
 118
 119 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 120                                  const struct prefix_info *pinfo,
 121                                  struct inet6_dev *in6_dev,
 122                                  const struct in6_addr *addr, int addr_type,
 123                                  u32 addr_flags, bool sllao, bool tokenized,
 124                                  __u32 valid_lft, u32 prefered_lft);
 125
 126 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 127 {
 128         memcpy(eui, addr, 3);
 129         eui[3] = 0xFF;
 130         eui[4] = 0xFE;
 131         memcpy(eui + 5, addr + 3, 3);
 132 }
 133
 134 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 135 {
 136         addrconf_addr_eui48_base(eui, addr);
 137         eui[0] ^= 2;
 138 }
 139
 140 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 141 {
 142         if (dev->addr_len != ETH_ALEN)
 143                 return -1;
 144
 145         /*
 146          * The zSeries OSA network cards can be shared among various
 147          * OS instances, but the OSA cards have only one MAC address.
 148          * This leads to duplicate address conflicts in conjunction
 149          * with IPv6 if more than one instance uses the same card.
 150          *
 151          * The driver for these cards can deliver a unique 16-bit
 152          * identifier for each instance sharing the same card.  It is
 153          * placed instead of 0xFFFE in the interface identifier.  The
 154          * "u" bit of the interface identifier is not inverted in this
 155          * case.  Hence the resulting interface identifier has local
 156          * scope according to RFC2373.
 157          */
 158
 159         addrconf_addr_eui48_base(eui, dev->dev_addr);
 160
 161         if (dev->dev_id) {
 162                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 163                 eui[4] = dev->dev_id & 0xFF;
 164         } else {
 165                 eui[0] ^= 2;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 172                                                    unsigned int unit)
 173 {
 174         if (timeout == 0xffffffff)
 175                 return ~0UL;
 176
 177         /*
 178          * Avoid arithmetic overflow.
 179          * Assuming unit is constant and non-zero, this "if" statement
 180          * will go away on 64bit archs.
 181          */
 182         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 183                 return LONG_MAX / unit;
 184
 185         return timeout;
 186 }
 187
 188 static inline int addrconf_finite_timeout(unsigned long timeout)
 189 {
 190         return ~timeout;
 191 }
 192
 193 /*
 194  *      IPv6 Address Label subsystem (addrlabel.c)
 195  */
 196 int ipv6_addr_label_init(void);
 197 void ipv6_addr_label_cleanup(void);
 198 int ipv6_addr_label_rtnl_register(void);
 199 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 200                     int type, int ifindex);
 201
 202 /*
 203  *      multicast prototypes (mcast.c)
 204  */
 205 static inline int ipv6_mc_may_pull(struct sk_buff *skb,
 206                                    unsigned int len)
 207 {
 208         if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
 209                 return -EINVAL;
 210
 211         return pskb_may_pull(skb, len);
 212 }
 213
 214 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 215                       const struct in6_addr *addr);
 216 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 217                       const struct in6_addr *addr);
 218 void __ipv6_sock_mc_close(struct sock *sk);
 219 void ipv6_sock_mc_close(struct sock *sk);
 220 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 221                     const struct in6_addr *src_addr);
 222
 223 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 224 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 225 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 226 void ipv6_mc_up(struct inet6_dev *idev);
 227 void ipv6_mc_down(struct inet6_dev *idev);
 228 void ipv6_mc_unmap(struct inet6_dev *idev);
 229 void ipv6_mc_remap(struct inet6_dev *idev);
 230 void ipv6_mc_init_dev(struct inet6_dev *idev);
 231 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 232 int ipv6_mc_check_icmpv6(struct sk_buff *skb);
 233 int ipv6_mc_check_mld(struct sk_buff *skb);
 234 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
 235
 236 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 237                          const struct in6_addr *src_addr);
 238
 239 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 240
 241 /*
 242  * identify MLD packets for MLD filter exceptions
 243  */
 244 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 245 {
 246         struct icmp6hdr *hdr;
 247
 248         if (nexthdr != IPPROTO_ICMPV6 ||
 249             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 250                 return false;
 251
 252         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 253
 254         switch (hdr->icmp6_type) {
 255         case ICMPV6_MGM_QUERY:
 256         case ICMPV6_MGM_REPORT:
 257         case ICMPV6_MGM_REDUCTION:
 258         case ICMPV6_MLD2_REPORT:
 259                 return true;
 260         default:
 261                 break;
 262         }
 263         return false;
 264 }
 265
 266 void addrconf_prefix_rcv(struct net_device *dev,
 267                          u8 *opt, int len, bool sllao);
 268
 269 /*
 270  *      anycast prototypes (anycast.c)
 271  */
 272 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 273                       const struct in6_addr *addr);
 274 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 275                       const struct in6_addr *addr);
 276 void ipv6_sock_ac_close(struct sock *sk);
 277
 278 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 279 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 280 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 281 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 282                          const struct in6_addr *addr);
 283 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 284                              const struct in6_addr *addr);
 285 int ipv6_anycast_init(void);
 286 void ipv6_anycast_cleanup(void);
 287
 288 /* Device notifier */
 289 int register_inet6addr_notifier(struct notifier_block *nb);
 290 int unregister_inet6addr_notifier(struct notifier_block *nb);
 291 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 292
 293 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 294 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 295 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 296
 297 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 298                                   int ifindex, struct ipv6_devconf *devconf);
 299
 300 /**
 301  * __in6_dev_get - get inet6_dev pointer from netdevice
 302  * @dev: network device
 303  *
 304  * Caller must hold rcu_read_lock or RTNL, because this function
 305  * does not take a reference on the inet6_dev.
 306  */
 307 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 308 {
 309         return rcu_dereference_rtnl(dev->ip6_ptr);
 310 }
 311
 312 /**
 313  * __in6_dev_get_safely - get inet6_dev pointer from netdevice
 314  * @dev: network device
 315  *
 316  * This is a safer version of __in6_dev_get
 317  */
 318 static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
 319 {
 320         if (likely(dev))
 321                 return rcu_dereference_rtnl(dev->ip6_ptr);
 322         else
 323                 return NULL;
 324 }
 325
 326 /**
 327  * in6_dev_get - get inet6_dev pointer from netdevice
 328  * @dev: network device
 329  *
 330  * This version can be used in any context, and takes a reference
 331  * on the inet6_dev. Callers must use in6_dev_put() later to
 332  * release this reference.
 333  */
 334 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 335 {
 336         struct inet6_dev *idev;
 337
 338         rcu_read_lock();
 339         idev = rcu_dereference(dev->ip6_ptr);
 340         if (idev)
 341                 refcount_inc(&idev->refcnt);
 342         rcu_read_unlock();
 343         return idev;
 344 }
 345
 346 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 347 {
 348         struct inet6_dev *idev = __in6_dev_get(dev);
 349
 350         return idev ? idev->nd_parms : NULL;
 351 }
 352
 353 void in6_dev_finish_destroy(struct inet6_dev *idev);
 354
 355 static inline void in6_dev_put(struct inet6_dev *idev)
 356 {
 357         if (refcount_dec_and_test(&idev->refcnt))
 358                 in6_dev_finish_destroy(idev);
 359 }
 360
 361 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 362 {
 363         struct inet6_dev *idev = *pidev;
 364
 365         if (idev) {
 366                 in6_dev_put(idev);
 367                 *pidev = NULL;
 368         }
 369 }
 370
 371 static inline void __in6_dev_put(struct inet6_dev *idev)
 372 {
 373         refcount_dec(&idev->refcnt);
 374 }
 375
 376 static inline void in6_dev_hold(struct inet6_dev *idev)
 377 {
 378         refcount_inc(&idev->refcnt);
 379 }
 380
 381 /* called with rcu_read_lock held */
 382 static inline bool ip6_ignore_linkdown(const struct net_device *dev)
 383 {
 384         const struct inet6_dev *idev = __in6_dev_get(dev);
 385
 386         return !!idev->cnf.ignore_routes_with_linkdown;
 387 }
 388
 389 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 390
 391 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 392 {
 393         if (refcount_dec_and_test(&ifp->refcnt))
 394                 inet6_ifa_finish_destroy(ifp);
 395 }
 396
 397 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 398 {
 399         refcount_dec(&ifp->refcnt);
 400 }
 401
 402 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 403 {
 404         refcount_inc(&ifp->refcnt);
 405 }
 406
 407
 408 /*
 409  *      compute link-local solicited-node multicast address
 410  */
 411
 412 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 413                                              struct in6_addr *solicited)
 414 {
 415         ipv6_addr_set(solicited,
 416                       htonl(0xFF020000), 0,
 417                       htonl(0x1),
 418                       htonl(0xFF000000) | addr->s6_addr32[3]);
 419 }
 420
 421 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 422 {
 423 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 424         __be64 *p = (__be64 *)addr;
 425         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 426 #else
 427         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 428                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 429                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 430 #endif
 431 }
 432
 433 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 434 {
 435 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 436         __be64 *p = (__be64 *)addr;
 437         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 438 #else
 439         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 440                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 441                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 442 #endif
 443 }
 444
 445 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 446 {
 447         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 448 }
 449
 450 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 451 {
 452 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 453         __be64 *p = (__be64 *)addr;
 454         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 455                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 456                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 457 #else
 458         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 459                 addr->s6_addr32[1] |
 460                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 461                 (addr->s6_addr[12] ^ 0xff)) == 0;
 462 #endif
 463 }
 464
 465 static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
 466 {
 467 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 468         __be64 *p = (__be64 *)addr;
 469
 470         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 471                 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
 472 #else
 473         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 474                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 475                 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
 476 #endif
 477 }
 478
 479 #ifdef CONFIG_PROC_FS
 480 int if6_proc_init(void);
 481 void if6_proc_exit(void);
 482 #endif
 483
 484 #endif