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 int addrconf_init(void);
  63 void addrconf_cleanup(void);
  64
  65 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  66 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  67 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  68
  69 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  70                   const struct net_device *dev, int strict);
  71 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  72                             const struct net_device *dev, bool skip_dev_check,
  73                             int strict, u32 banned_flags);
  74
  75 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  76 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  77 #endif
  78
  79 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  80                                    const unsigned int prefix_len,
  81                                    struct net_device *dev);
  82
  83 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  84
  85 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  86                                      const struct in6_addr *addr,
  87                                      struct net_device *dev, int strict);
  88
  89 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  90                        const struct in6_addr *daddr, unsigned int srcprefs,
  91                        struct in6_addr *saddr);
  92 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  93                       u32 banned_flags);
  94 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  95                     u32 banned_flags);
  96 bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  97                           bool match_wildcard);
  98 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  99 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 100
 101 void addrconf_add_linklocal(struct inet6_dev *idev,
 102                             const struct in6_addr *addr, u32 flags);
 103
 104 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 105                                  const struct prefix_info *pinfo,
 106                                  struct inet6_dev *in6_dev,
 107                                  const struct in6_addr *addr, int addr_type,
 108                                  u32 addr_flags, bool sllao, bool tokenized,
 109                                  __u32 valid_lft, u32 prefered_lft);
 110
 111 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 112 {
 113         memcpy(eui, addr, 3);
 114         eui[3] = 0xFF;
 115         eui[4] = 0xFE;
 116         memcpy(eui + 5, addr + 3, 3);
 117 }
 118
 119 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 120 {
 121         addrconf_addr_eui48_base(eui, addr);
 122         eui[0] ^= 2;
 123 }
 124
 125 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 126 {
 127         if (dev->addr_len != ETH_ALEN)
 128                 return -1;
 129
 130         /*
 131          * The zSeries OSA network cards can be shared among various
 132          * OS instances, but the OSA cards have only one MAC address.
 133          * This leads to duplicate address conflicts in conjunction
 134          * with IPv6 if more than one instance uses the same card.
 135          *
 136          * The driver for these cards can deliver a unique 16-bit
 137          * identifier for each instance sharing the same card.  It is
 138          * placed instead of 0xFFFE in the interface identifier.  The
 139          * "u" bit of the interface identifier is not inverted in this
 140          * case.  Hence the resulting interface identifier has local
 141          * scope according to RFC2373.
 142          */
 143
 144         addrconf_addr_eui48_base(eui, dev->dev_addr);
 145
 146         if (dev->dev_id) {
 147                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 148                 eui[4] = dev->dev_id & 0xFF;
 149         } else {
 150                 eui[0] ^= 2;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 157                                                    unsigned int unit)
 158 {
 159         if (timeout == 0xffffffff)
 160                 return ~0UL;
 161
 162         /*
 163          * Avoid arithmetic overflow.
 164          * Assuming unit is constant and non-zero, this "if" statement
 165          * will go away on 64bit archs.
 166          */
 167         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 168                 return LONG_MAX / unit;
 169
 170         return timeout;
 171 }
 172
 173 static inline int addrconf_finite_timeout(unsigned long timeout)
 174 {
 175         return ~timeout;
 176 }
 177
 178 /*
 179  *      IPv6 Address Label subsystem (addrlabel.c)
 180  */
 181 int ipv6_addr_label_init(void);
 182 void ipv6_addr_label_cleanup(void);
 183 int ipv6_addr_label_rtnl_register(void);
 184 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 185                     int type, int ifindex);
 186
 187 /*
 188  *      multicast prototypes (mcast.c)
 189  */
 190 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 191                       const struct in6_addr *addr);
 192 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 193                       const struct in6_addr *addr);
 194 void __ipv6_sock_mc_close(struct sock *sk);
 195 void ipv6_sock_mc_close(struct sock *sk);
 196 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 197                     const struct in6_addr *src_addr);
 198
 199 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 200 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 201 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 202 void ipv6_mc_up(struct inet6_dev *idev);
 203 void ipv6_mc_down(struct inet6_dev *idev);
 204 void ipv6_mc_unmap(struct inet6_dev *idev);
 205 void ipv6_mc_remap(struct inet6_dev *idev);
 206 void ipv6_mc_init_dev(struct inet6_dev *idev);
 207 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 208 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 209 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
 210
 211 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 212                          const struct in6_addr *src_addr);
 213
 214 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 215
 216 /* A stub used by vxlan module. This is ugly, ideally these
 217  * symbols should be built into the core kernel.
 218  */
 219 struct ipv6_stub {
 220         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 221                                  const struct in6_addr *addr);
 222         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 223                                  const struct in6_addr *addr);
 224         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 225                                struct dst_entry **dst, struct flowi6 *fl6);
 226         void (*udpv6_encap_enable)(void);
 227         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 228                               const struct in6_addr *solicited_addr,
 229                               bool router, bool solicited, bool override, bool inc_opt);
 230         struct neigh_table *nd_tbl;
 231 };
 232 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 233
 234 /* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
 235 struct ipv6_bpf_stub {
 236         int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 237                           bool force_bind_address_no_port, bool with_lock);
 238 };
 239 extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
 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
 286 /* Device notifier */
 287 int register_inet6addr_notifier(struct notifier_block *nb);
 288 int unregister_inet6addr_notifier(struct notifier_block *nb);
 289 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 290
 291 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 292 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 293 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 294
 295 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 296                                   int ifindex, struct ipv6_devconf *devconf);
 297
 298 /**
 299  * __in6_dev_get - get inet6_dev pointer from netdevice
 300  * @dev: network device
 301  *
 302  * Caller must hold rcu_read_lock or RTNL, because this function
 303  * does not take a reference on the inet6_dev.
 304  */
 305 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 306 {
 307         return rcu_dereference_rtnl(dev->ip6_ptr);
 308 }
 309
 310 /**
 311  * in6_dev_get - get inet6_dev pointer from netdevice
 312  * @dev: network device
 313  *
 314  * This version can be used in any context, and takes a reference
 315  * on the inet6_dev. Callers must use in6_dev_put() later to
 316  * release this reference.
 317  */
 318 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 319 {
 320         struct inet6_dev *idev;
 321
 322         rcu_read_lock();
 323         idev = rcu_dereference(dev->ip6_ptr);
 324         if (idev)
 325                 refcount_inc(&idev->refcnt);
 326         rcu_read_unlock();
 327         return idev;
 328 }
 329
 330 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 331 {
 332         struct inet6_dev *idev = __in6_dev_get(dev);
 333
 334         return idev ? idev->nd_parms : NULL;
 335 }
 336
 337 void in6_dev_finish_destroy(struct inet6_dev *idev);
 338
 339 static inline void in6_dev_put(struct inet6_dev *idev)
 340 {
 341         if (refcount_dec_and_test(&idev->refcnt))
 342                 in6_dev_finish_destroy(idev);
 343 }
 344
 345 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 346 {
 347         struct inet6_dev *idev = *pidev;
 348
 349         if (idev) {
 350                 in6_dev_put(idev);
 351                 *pidev = NULL;
 352         }
 353 }
 354
 355 static inline void __in6_dev_put(struct inet6_dev *idev)
 356 {
 357         refcount_dec(&idev->refcnt);
 358 }
 359
 360 static inline void in6_dev_hold(struct inet6_dev *idev)
 361 {
 362         refcount_inc(&idev->refcnt);
 363 }
 364
 365 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 366
 367 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 368 {
 369         if (refcount_dec_and_test(&ifp->refcnt))
 370                 inet6_ifa_finish_destroy(ifp);
 371 }
 372
 373 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 374 {
 375         refcount_dec(&ifp->refcnt);
 376 }
 377
 378 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 379 {
 380         refcount_inc(&ifp->refcnt);
 381 }
 382
 383
 384 /*
 385  *      compute link-local solicited-node multicast address
 386  */
 387
 388 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 389                                              struct in6_addr *solicited)
 390 {
 391         ipv6_addr_set(solicited,
 392                       htonl(0xFF020000), 0,
 393                       htonl(0x1),
 394                       htonl(0xFF000000) | addr->s6_addr32[3]);
 395 }
 396
 397 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 398 {
 399 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 400         __be64 *p = (__be64 *)addr;
 401         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 402 #else
 403         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 404                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 405                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 406 #endif
 407 }
 408
 409 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 410 {
 411 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 412         __be64 *p = (__be64 *)addr;
 413         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 414 #else
 415         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 416                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 417                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 418 #endif
 419 }
 420
 421 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 422 {
 423         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 424 }
 425
 426 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 427 {
 428 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 429         __be64 *p = (__be64 *)addr;
 430         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 431                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 432                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 433 #else
 434         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 435                 addr->s6_addr32[1] |
 436                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 437                 (addr->s6_addr[12] ^ 0xff)) == 0;
 438 #endif
 439 }
 440
 441 #ifdef CONFIG_PROC_FS
 442 int if6_proc_init(void);
 443 void if6_proc_exit(void);
 444 #endif
 445
 446 #endif